1 /*
   2  * Copyright (c) 1995, 2017, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.  Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 package java.awt;
  26 
  27 import java.io.PrintStream;
  28 import java.io.PrintWriter;
  29 import java.util.Objects;
  30 import java.util.Vector;
  31 import java.util.Locale;
  32 import java.util.EventListener;
  33 import java.util.HashSet;
  34 import java.util.Map;
  35 import java.util.Set;
  36 import java.util.Collections;
  37 import java.awt.peer.ComponentPeer;
  38 import java.awt.peer.ContainerPeer;
  39 import java.awt.peer.LightweightPeer;
  40 import java.awt.image.BufferStrategy;
  41 import java.awt.image.ImageObserver;
  42 import java.awt.image.ImageProducer;
  43 import java.awt.image.ColorModel;
  44 import java.awt.image.VolatileImage;
  45 import java.awt.event.*;
  46 import java.io.Serializable;
  47 import java.io.ObjectOutputStream;
  48 import java.io.ObjectInputStream;
  49 import java.io.IOException;
  50 import java.beans.PropertyChangeListener;
  51 import java.beans.PropertyChangeSupport;
  52 import java.beans.Transient;
  53 import java.awt.im.InputContext;
  54 import java.awt.im.InputMethodRequests;
  55 import java.awt.dnd.DropTarget;
  56 import java.security.AccessController;
  57 import java.security.AccessControlContext;
  58 import javax.accessibility.*;
  59 import java.applet.Applet;
  60 import javax.swing.JComponent;
  61 import javax.swing.JRootPane;
  62 
  63 import sun.awt.ComponentFactory;
  64 import sun.security.action.GetPropertyAction;
  65 import sun.awt.AppContext;
  66 import sun.awt.AWTAccessor;
  67 import sun.awt.ConstrainableGraphics;
  68 import sun.awt.SubRegionShowable;
  69 import sun.awt.SunToolkit;
  70 import sun.awt.EmbeddedFrame;
  71 import sun.awt.dnd.SunDropTargetEvent;
  72 import sun.awt.im.CompositionArea;
  73 import sun.font.FontManager;
  74 import sun.font.FontManagerFactory;
  75 import sun.font.SunFontManager;
  76 import sun.java2d.SunGraphics2D;
  77 import sun.java2d.pipe.Region;
  78 import sun.awt.image.VSyncedBSManager;
  79 import sun.java2d.pipe.hw.ExtendedBufferCapabilities;
  80 import static sun.java2d.pipe.hw.ExtendedBufferCapabilities.VSyncType.*;
  81 import sun.awt.RequestFocusController;
  82 import sun.java2d.SunGraphicsEnvironment;
  83 import sun.swing.SwingAccessor;
  84 import sun.util.logging.PlatformLogger;
  85 
  86 /**
  87  * A <em>component</em> is an object having a graphical representation
  88  * that can be displayed on the screen and that can interact with the
  89  * user. Examples of components are the buttons, checkboxes, and scrollbars
  90  * of a typical graphical user interface. <p>
  91  * The {@code Component} class is the abstract superclass of
  92  * the nonmenu-related Abstract Window Toolkit components. Class
  93  * {@code Component} can also be extended directly to create a
  94  * lightweight component. A lightweight component is a component that is
  95  * not associated with a native window. On the contrary, a heavyweight
  96  * component is associated with a native window. The {@link #isLightweight()}
  97  * method may be used to distinguish between the two kinds of the components.
  98  * <p>
  99  * Lightweight and heavyweight components may be mixed in a single component
 100  * hierarchy. However, for correct operating of such a mixed hierarchy of
 101  * components, the whole hierarchy must be valid. When the hierarchy gets
 102  * invalidated, like after changing the bounds of components, or
 103  * adding/removing components to/from containers, the whole hierarchy must be
 104  * validated afterwards by means of the {@link Container#validate()} method
 105  * invoked on the top-most invalid container of the hierarchy.
 106  *
 107  * <h3>Serialization</h3>
 108  * It is important to note that only AWT listeners which conform
 109  * to the {@code Serializable} protocol will be saved when
 110  * the object is stored.  If an AWT object has listeners that
 111  * aren't marked serializable, they will be dropped at
 112  * {@code writeObject} time.  Developers will need, as always,
 113  * to consider the implications of making an object serializable.
 114  * One situation to watch out for is this:
 115  * <pre>
 116  *    import java.awt.*;
 117  *    import java.awt.event.*;
 118  *    import java.io.Serializable;
 119  *
 120  *    class MyApp implements ActionListener, Serializable
 121  *    {
 122  *        BigObjectThatShouldNotBeSerializedWithAButton bigOne;
 123  *        Button aButton = new Button();
 124  *
 125  *        MyApp()
 126  *        {
 127  *            // Oops, now aButton has a listener with a reference
 128  *            // to bigOne!
 129  *            aButton.addActionListener(this);
 130  *        }
 131  *
 132  *        public void actionPerformed(ActionEvent e)
 133  *        {
 134  *            System.out.println("Hello There");
 135  *        }
 136  *    }
 137  * </pre>
 138  * In this example, serializing {@code aButton} by itself
 139  * will cause {@code MyApp} and everything it refers to
 140  * to be serialized as well.  The problem is that the listener
 141  * is serializable by coincidence, not by design.  To separate
 142  * the decisions about {@code MyApp} and the
 143  * {@code ActionListener} being serializable one can use a
 144  * nested class, as in the following example:
 145  * <pre>
 146  *    import java.awt.*;
 147  *    import java.awt.event.*;
 148  *    import java.io.Serializable;
 149  *
 150  *    class MyApp implements java.io.Serializable
 151  *    {
 152  *         BigObjectThatShouldNotBeSerializedWithAButton bigOne;
 153  *         Button aButton = new Button();
 154  *
 155  *         static class MyActionListener implements ActionListener
 156  *         {
 157  *             public void actionPerformed(ActionEvent e)
 158  *             {
 159  *                 System.out.println("Hello There");
 160  *             }
 161  *         }
 162  *
 163  *         MyApp()
 164  *         {
 165  *             aButton.addActionListener(new MyActionListener());
 166  *         }
 167  *    }
 168  * </pre>
 169  * <p>
 170  * <b>Note</b>: For more information on the paint mechanisms utilized
 171  * by AWT and Swing, including information on how to write the most
 172  * efficient painting code, see
 173  * <a href="http://www.oracle.com/technetwork/java/painting-140037.html">Painting in AWT and Swing</a>.
 174  * <p>
 175  * For details on the focus subsystem, see
 176  * <a href="http://docs.oracle.com/javase/tutorial/uiswing/misc/focus.html">
 177  * How to Use the Focus Subsystem</a>,
 178  * a section in <em>The Java Tutorial</em>, and the
 179  * <a href="../../java/awt/doc-files/FocusSpec.html">Focus Specification</a>
 180  * for more information.
 181  *
 182  * @author      Arthur van Hoff
 183  * @author      Sami Shaio
 184  */
 185 public abstract class Component implements ImageObserver, MenuContainer,
 186                                            Serializable
 187 {
 188 
 189     private static final PlatformLogger log = PlatformLogger.getLogger("java.awt.Component");
 190     private static final PlatformLogger eventLog = PlatformLogger.getLogger("java.awt.event.Component");
 191     private static final PlatformLogger focusLog = PlatformLogger.getLogger("java.awt.focus.Component");
 192     private static final PlatformLogger mixingLog = PlatformLogger.getLogger("java.awt.mixing.Component");
 193 
 194     /**
 195      * The peer of the component. The peer implements the component's
 196      * behavior. The peer is set when the {@code Component} is
 197      * added to a container that also is a peer.
 198      * @see #addNotify
 199      * @see #removeNotify
 200      */
 201     transient volatile ComponentPeer peer;
 202 
 203     /**
 204      * The parent of the object. It may be {@code null}
 205      * for top-level components.
 206      * @see #getParent
 207      */
 208     transient Container parent;
 209 
 210     /**
 211      * The {@code AppContext} of the component. Applets/Plugin may
 212      * change the AppContext.
 213      */
 214     transient AppContext appContext;
 215 
 216     /**
 217      * The x position of the component in the parent's coordinate system.
 218      *
 219      * @serial
 220      * @see #getLocation
 221      */
 222     int x;
 223 
 224     /**
 225      * The y position of the component in the parent's coordinate system.
 226      *
 227      * @serial
 228      * @see #getLocation
 229      */
 230     int y;
 231 
 232     /**
 233      * The width of the component.
 234      *
 235      * @serial
 236      * @see #getSize
 237      */
 238     int width;
 239 
 240     /**
 241      * The height of the component.
 242      *
 243      * @serial
 244      * @see #getSize
 245      */
 246     int height;
 247 
 248     /**
 249      * The foreground color for this component.
 250      * {@code foreground} can be {@code null}.
 251      *
 252      * @serial
 253      * @see #getForeground
 254      * @see #setForeground
 255      */
 256     Color       foreground;
 257 
 258     /**
 259      * The background color for this component.
 260      * {@code background} can be {@code null}.
 261      *
 262      * @serial
 263      * @see #getBackground
 264      * @see #setBackground
 265      */
 266     Color       background;
 267 
 268     /**
 269      * The font used by this component.
 270      * The {@code font} can be {@code null}.
 271      *
 272      * @serial
 273      * @see #getFont
 274      * @see #setFont
 275      */
 276     volatile Font font;
 277 
 278     /**
 279      * The font which the peer is currently using.
 280      * ({@code null} if no peer exists.)
 281      */
 282     Font        peerFont;
 283 
 284     /**
 285      * The cursor displayed when pointer is over this component.
 286      * This value can be {@code null}.
 287      *
 288      * @serial
 289      * @see #getCursor
 290      * @see #setCursor
 291      */
 292     Cursor      cursor;
 293 
 294     /**
 295      * The locale for the component.
 296      *
 297      * @serial
 298      * @see #getLocale
 299      * @see #setLocale
 300      */
 301     Locale      locale;
 302 
 303     /**
 304      * A reference to a {@code GraphicsConfiguration} object
 305      * used to describe the characteristics of a graphics
 306      * destination.
 307      * This value can be {@code null}.
 308      *
 309      * @since 1.3
 310      * @serial
 311      * @see GraphicsConfiguration
 312      * @see #getGraphicsConfiguration
 313      */
 314     private transient volatile GraphicsConfiguration graphicsConfig;
 315 
 316     /**
 317      * A reference to a {@code BufferStrategy} object
 318      * used to manipulate the buffers on this component.
 319      *
 320      * @since 1.4
 321      * @see java.awt.image.BufferStrategy
 322      * @see #getBufferStrategy()
 323      */
 324     transient BufferStrategy bufferStrategy = null;
 325 
 326     /**
 327      * True when the object should ignore all repaint events.
 328      *
 329      * @since 1.4
 330      * @serial
 331      * @see #setIgnoreRepaint
 332      * @see #getIgnoreRepaint
 333      */
 334     boolean ignoreRepaint = false;
 335 
 336     /**
 337      * True when the object is visible. An object that is not
 338      * visible is not drawn on the screen.
 339      *
 340      * @serial
 341      * @see #isVisible
 342      * @see #setVisible
 343      */
 344     boolean visible = true;
 345 
 346     /**
 347      * True when the object is enabled. An object that is not
 348      * enabled does not interact with the user.
 349      *
 350      * @serial
 351      * @see #isEnabled
 352      * @see #setEnabled
 353      */
 354     boolean enabled = true;
 355 
 356     /**
 357      * True when the object is valid. An invalid object needs to
 358      * be laid out. This flag is set to false when the object
 359      * size is changed.
 360      *
 361      * @serial
 362      * @see #isValid
 363      * @see #validate
 364      * @see #invalidate
 365      */
 366     private volatile boolean valid = false;
 367 
 368     /**
 369      * The {@code DropTarget} associated with this component.
 370      *
 371      * @since 1.2
 372      * @serial
 373      * @see #setDropTarget
 374      * @see #getDropTarget
 375      */
 376     DropTarget dropTarget;
 377 
 378     /**
 379      * @serial
 380      * @see #add
 381      */
 382     Vector<PopupMenu> popups;
 383 
 384     /**
 385      * A component's name.
 386      * This field can be {@code null}.
 387      *
 388      * @serial
 389      * @see #getName
 390      * @see #setName(String)
 391      */
 392     private String name;
 393 
 394     /**
 395      * A bool to determine whether the name has
 396      * been set explicitly. {@code nameExplicitlySet} will
 397      * be false if the name has not been set and
 398      * true if it has.
 399      *
 400      * @serial
 401      * @see #getName
 402      * @see #setName(String)
 403      */
 404     private boolean nameExplicitlySet = false;
 405 
 406     /**
 407      * Indicates whether this Component can be focused.
 408      *
 409      * @serial
 410      * @see #setFocusable
 411      * @see #isFocusable
 412      * @since 1.4
 413      */
 414     private boolean focusable = true;
 415 
 416     private static final int FOCUS_TRAVERSABLE_UNKNOWN = 0;
 417     private static final int FOCUS_TRAVERSABLE_DEFAULT = 1;
 418     private static final int FOCUS_TRAVERSABLE_SET = 2;
 419 
 420     /**
 421      * Tracks whether this Component is relying on default focus traversability.
 422      *
 423      * @serial
 424      * @since 1.4
 425      */
 426     private int isFocusTraversableOverridden = FOCUS_TRAVERSABLE_UNKNOWN;
 427 
 428     /**
 429      * The focus traversal keys. These keys will generate focus traversal
 430      * behavior for Components for which focus traversal keys are enabled. If a
 431      * value of null is specified for a traversal key, this Component inherits
 432      * that traversal key from its parent. If all ancestors of this Component
 433      * have null specified for that traversal key, then the current
 434      * KeyboardFocusManager's default traversal key is used.
 435      *
 436      * @serial
 437      * @see #setFocusTraversalKeys
 438      * @see #getFocusTraversalKeys
 439      * @since 1.4
 440      */
 441     Set<AWTKeyStroke>[] focusTraversalKeys;
 442 
 443     private static final String[] focusTraversalKeyPropertyNames = {
 444         "forwardFocusTraversalKeys",
 445         "backwardFocusTraversalKeys",
 446         "upCycleFocusTraversalKeys",
 447         "downCycleFocusTraversalKeys"
 448     };
 449 
 450     /**
 451      * Indicates whether focus traversal keys are enabled for this Component.
 452      * Components for which focus traversal keys are disabled receive key
 453      * events for focus traversal keys. Components for which focus traversal
 454      * keys are enabled do not see these events; instead, the events are
 455      * automatically converted to traversal operations.
 456      *
 457      * @serial
 458      * @see #setFocusTraversalKeysEnabled
 459      * @see #getFocusTraversalKeysEnabled
 460      * @since 1.4
 461      */
 462     private boolean focusTraversalKeysEnabled = true;
 463 
 464     /**
 465      * The locking object for AWT component-tree and layout operations.
 466      *
 467      * @see #getTreeLock
 468      */
 469     static final Object LOCK = new AWTTreeLock();
 470     static class AWTTreeLock {}
 471 
 472     /*
 473      * The component's AccessControlContext.
 474      */
 475     private transient volatile AccessControlContext acc =
 476         AccessController.getContext();
 477 
 478     /**
 479      * Minimum size.
 480      * (This field perhaps should have been transient).
 481      *
 482      * @serial
 483      */
 484     Dimension minSize;
 485 
 486     /**
 487      * Whether or not setMinimumSize has been invoked with a non-null value.
 488      */
 489     boolean minSizeSet;
 490 
 491     /**
 492      * Preferred size.
 493      * (This field perhaps should have been transient).
 494      *
 495      * @serial
 496      */
 497     Dimension prefSize;
 498 
 499     /**
 500      * Whether or not setPreferredSize has been invoked with a non-null value.
 501      */
 502     boolean prefSizeSet;
 503 
 504     /**
 505      * Maximum size
 506      *
 507      * @serial
 508      */
 509     Dimension maxSize;
 510 
 511     /**
 512      * Whether or not setMaximumSize has been invoked with a non-null value.
 513      */
 514     boolean maxSizeSet;
 515 
 516     /**
 517      * The orientation for this component.
 518      * @see #getComponentOrientation
 519      * @see #setComponentOrientation
 520      */
 521     transient ComponentOrientation componentOrientation
 522     = ComponentOrientation.UNKNOWN;
 523 
 524     /**
 525      * {@code newEventsOnly} will be true if the event is
 526      * one of the event types enabled for the component.
 527      * It will then allow for normal processing to
 528      * continue.  If it is false the event is passed
 529      * to the component's parent and up the ancestor
 530      * tree until the event has been consumed.
 531      *
 532      * @serial
 533      * @see #dispatchEvent
 534      */
 535     boolean newEventsOnly = false;
 536     transient ComponentListener componentListener;
 537     transient FocusListener focusListener;
 538     transient HierarchyListener hierarchyListener;
 539     transient HierarchyBoundsListener hierarchyBoundsListener;
 540     transient KeyListener keyListener;
 541     transient MouseListener mouseListener;
 542     transient MouseMotionListener mouseMotionListener;
 543     transient MouseWheelListener mouseWheelListener;
 544     transient InputMethodListener inputMethodListener;
 545 
 546     /** Internal, constants for serialization */
 547     static final String actionListenerK = "actionL";
 548     static final String adjustmentListenerK = "adjustmentL";
 549     static final String componentListenerK = "componentL";
 550     static final String containerListenerK = "containerL";
 551     static final String focusListenerK = "focusL";
 552     static final String itemListenerK = "itemL";
 553     static final String keyListenerK = "keyL";
 554     static final String mouseListenerK = "mouseL";
 555     static final String mouseMotionListenerK = "mouseMotionL";
 556     static final String mouseWheelListenerK = "mouseWheelL";
 557     static final String textListenerK = "textL";
 558     static final String ownedWindowK = "ownedL";
 559     static final String windowListenerK = "windowL";
 560     static final String inputMethodListenerK = "inputMethodL";
 561     static final String hierarchyListenerK = "hierarchyL";
 562     static final String hierarchyBoundsListenerK = "hierarchyBoundsL";
 563     static final String windowStateListenerK = "windowStateL";
 564     static final String windowFocusListenerK = "windowFocusL";
 565 
 566     /**
 567      * The {@code eventMask} is ONLY set by subclasses via
 568      * {@code enableEvents}.
 569      * The mask should NOT be set when listeners are registered
 570      * so that we can distinguish the difference between when
 571      * listeners request events and subclasses request them.
 572      * One bit is used to indicate whether input methods are
 573      * enabled; this bit is set by {@code enableInputMethods} and is
 574      * on by default.
 575      *
 576      * @serial
 577      * @see #enableInputMethods
 578      * @see AWTEvent
 579      */
 580     long eventMask = AWTEvent.INPUT_METHODS_ENABLED_MASK;
 581 
 582     /**
 583      * Static properties for incremental drawing.
 584      * @see #imageUpdate
 585      */
 586     static boolean isInc;
 587     static int incRate;
 588     static {
 589         /* ensure that the necessary native libraries are loaded */
 590         Toolkit.loadLibraries();
 591         /* initialize JNI field and method ids */
 592         if (!GraphicsEnvironment.isHeadless()) {
 593             initIDs();
 594         }
 595 
 596         String s = java.security.AccessController.doPrivileged(
 597                                                                new GetPropertyAction("awt.image.incrementaldraw"));
 598         isInc = (s == null || s.equals("true"));
 599 
 600         s = java.security.AccessController.doPrivileged(
 601                                                         new GetPropertyAction("awt.image.redrawrate"));
 602         incRate = (s != null) ? Integer.parseInt(s) : 100;
 603     }
 604 
 605     /**
 606      * Ease-of-use constant for {@code getAlignmentY()}.
 607      * Specifies an alignment to the top of the component.
 608      * @see     #getAlignmentY
 609      */
 610     public static final float TOP_ALIGNMENT = 0.0f;
 611 
 612     /**
 613      * Ease-of-use constant for {@code getAlignmentY} and
 614      * {@code getAlignmentX}. Specifies an alignment to
 615      * the center of the component
 616      * @see     #getAlignmentX
 617      * @see     #getAlignmentY
 618      */
 619     public static final float CENTER_ALIGNMENT = 0.5f;
 620 
 621     /**
 622      * Ease-of-use constant for {@code getAlignmentY}.
 623      * Specifies an alignment to the bottom of the component.
 624      * @see     #getAlignmentY
 625      */
 626     public static final float BOTTOM_ALIGNMENT = 1.0f;
 627 
 628     /**
 629      * Ease-of-use constant for {@code getAlignmentX}.
 630      * Specifies an alignment to the left side of the component.
 631      * @see     #getAlignmentX
 632      */
 633     public static final float LEFT_ALIGNMENT = 0.0f;
 634 
 635     /**
 636      * Ease-of-use constant for {@code getAlignmentX}.
 637      * Specifies an alignment to the right side of the component.
 638      * @see     #getAlignmentX
 639      */
 640     public static final float RIGHT_ALIGNMENT = 1.0f;
 641 
 642     /*
 643      * JDK 1.1 serialVersionUID
 644      */
 645     private static final long serialVersionUID = -7644114512714619750L;
 646 
 647     /**
 648      * If any {@code PropertyChangeListeners} have been registered,
 649      * the {@code changeSupport} field describes them.
 650      *
 651      * @serial
 652      * @since 1.2
 653      * @see #addPropertyChangeListener
 654      * @see #removePropertyChangeListener
 655      * @see #firePropertyChange
 656      */
 657     private PropertyChangeSupport changeSupport;
 658 
 659     /*
 660      * In some cases using "this" as an object to synchronize by
 661      * can lead to a deadlock if client code also uses synchronization
 662      * by a component object. For every such situation revealed we should
 663      * consider possibility of replacing "this" with the package private
 664      * objectLock object introduced below. So far there are 3 issues known:
 665      * - CR 6708322 (the getName/setName methods);
 666      * - CR 6608764 (the PropertyChangeListener machinery);
 667      * - CR 7108598 (the Container.paint/KeyboardFocusManager.clearMostRecentFocusOwner methods).
 668      *
 669      * Note: this field is considered final, though readObject() prohibits
 670      * initializing final fields.
 671      */
 672     private transient Object objectLock = new Object();
 673     Object getObjectLock() {
 674         return objectLock;
 675     }
 676 
 677     /*
 678      * Returns the acc this component was constructed with.
 679      */
 680     final AccessControlContext getAccessControlContext() {
 681         if (acc == null) {
 682             throw new SecurityException("Component is missing AccessControlContext");
 683         }
 684         return acc;
 685     }
 686 
 687     boolean isPacked = false;
 688 
 689     /**
 690      * Pseudoparameter for direct Geometry API (setLocation, setBounds setSize
 691      * to signal setBounds what's changing. Should be used under TreeLock.
 692      * This is only needed due to the inability to change the cross-calling
 693      * order of public and deprecated methods.
 694      */
 695     private int boundsOp = ComponentPeer.DEFAULT_OPERATION;
 696 
 697     /**
 698      * Enumeration of the common ways the baseline of a component can
 699      * change as the size changes.  The baseline resize behavior is
 700      * primarily for layout managers that need to know how the
 701      * position of the baseline changes as the component size changes.
 702      * In general the baseline resize behavior will be valid for sizes
 703      * greater than or equal to the minimum size (the actual minimum
 704      * size; not a developer specified minimum size).  For sizes
 705      * smaller than the minimum size the baseline may change in a way
 706      * other than the baseline resize behavior indicates.  Similarly,
 707      * as the size approaches {@code Integer.MAX_VALUE} and/or
 708      * {@code Short.MAX_VALUE} the baseline may change in a way
 709      * other than the baseline resize behavior indicates.
 710      *
 711      * @see #getBaselineResizeBehavior
 712      * @see #getBaseline(int,int)
 713      * @since 1.6
 714      */
 715     public enum BaselineResizeBehavior {
 716         /**
 717          * Indicates the baseline remains fixed relative to the
 718          * y-origin.  That is, {@code getBaseline} returns
 719          * the same value regardless of the height or width.  For example, a
 720          * {@code JLabel} containing non-empty text with a
 721          * vertical alignment of {@code TOP} should have a
 722          * baseline type of {@code CONSTANT_ASCENT}.
 723          */
 724         CONSTANT_ASCENT,
 725 
 726         /**
 727          * Indicates the baseline remains fixed relative to the height
 728          * and does not change as the width is varied.  That is, for
 729          * any height H the difference between H and
 730          * {@code getBaseline(w, H)} is the same.  For example, a
 731          * {@code JLabel} containing non-empty text with a
 732          * vertical alignment of {@code BOTTOM} should have a
 733          * baseline type of {@code CONSTANT_DESCENT}.
 734          */
 735         CONSTANT_DESCENT,
 736 
 737         /**
 738          * Indicates the baseline remains a fixed distance from
 739          * the center of the component.  That is, for any height H the
 740          * difference between {@code getBaseline(w, H)} and
 741          * {@code H / 2} is the same (plus or minus one depending upon
 742          * rounding error).
 743          * <p>
 744          * Because of possible rounding errors it is recommended
 745          * you ask for the baseline with two consecutive heights and use
 746          * the return value to determine if you need to pad calculations
 747          * by 1.  The following shows how to calculate the baseline for
 748          * any height:
 749          * <pre>
 750          *   Dimension preferredSize = component.getPreferredSize();
 751          *   int baseline = getBaseline(preferredSize.width,
 752          *                              preferredSize.height);
 753          *   int nextBaseline = getBaseline(preferredSize.width,
 754          *                                  preferredSize.height + 1);
 755          *   // Amount to add to height when calculating where baseline
 756          *   // lands for a particular height:
 757          *   int padding = 0;
 758          *   // Where the baseline is relative to the mid point
 759          *   int baselineOffset = baseline - height / 2;
 760          *   if (preferredSize.height % 2 == 0 &amp;&amp;
 761          *       baseline != nextBaseline) {
 762          *       padding = 1;
 763          *   }
 764          *   else if (preferredSize.height % 2 == 1 &amp;&amp;
 765          *            baseline == nextBaseline) {
 766          *       baselineOffset--;
 767          *       padding = 1;
 768          *   }
 769          *   // The following calculates where the baseline lands for
 770          *   // the height z:
 771          *   int calculatedBaseline = (z + padding) / 2 + baselineOffset;
 772          * </pre>
 773          */
 774         CENTER_OFFSET,
 775 
 776         /**
 777          * Indicates the baseline resize behavior can not be expressed using
 778          * any of the other constants.  This may also indicate the baseline
 779          * varies with the width of the component.  This is also returned
 780          * by components that do not have a baseline.
 781          */
 782         OTHER
 783     }
 784 
 785     /*
 786      * The shape set with the applyCompoundShape() method. It includes the result
 787      * of the HW/LW mixing related shape computation. It may also include
 788      * the user-specified shape of the component.
 789      * The 'null' value means the component has normal shape (or has no shape at all)
 790      * and applyCompoundShape() will skip the following shape identical to normal.
 791      */
 792     private transient Region compoundShape = null;
 793 
 794     /*
 795      * Represents the shape of this lightweight component to be cut out from
 796      * heavyweight components should they intersect. Possible values:
 797      *    1. null - consider the shape rectangular
 798      *    2. EMPTY_REGION - nothing gets cut out (children still get cut out)
 799      *    3. non-empty - this shape gets cut out.
 800      */
 801     private transient Region mixingCutoutRegion = null;
 802 
 803     /*
 804      * Indicates whether addNotify() is complete
 805      * (i.e. the peer is created).
 806      */
 807     private transient boolean isAddNotifyComplete = false;
 808 
 809     /**
 810      * Should only be used in subclass getBounds to check that part of bounds
 811      * is actually changing
 812      */
 813     int getBoundsOp() {
 814         assert Thread.holdsLock(getTreeLock());
 815         return boundsOp;
 816     }
 817 
 818     void setBoundsOp(int op) {
 819         assert Thread.holdsLock(getTreeLock());
 820         if (op == ComponentPeer.RESET_OPERATION) {
 821             boundsOp = ComponentPeer.DEFAULT_OPERATION;
 822         } else
 823             if (boundsOp == ComponentPeer.DEFAULT_OPERATION) {
 824                 boundsOp = op;
 825             }
 826     }
 827 
 828     // Whether this Component has had the background erase flag
 829     // specified via SunToolkit.disableBackgroundErase(). This is
 830     // needed in order to make this function work on X11 platforms,
 831     // where currently there is no chance to interpose on the creation
 832     // of the peer and therefore the call to XSetBackground.
 833     transient boolean backgroundEraseDisabled;
 834 
 835     static {
 836         AWTAccessor.setComponentAccessor(new AWTAccessor.ComponentAccessor() {
 837             public void setBackgroundEraseDisabled(Component comp, boolean disabled) {
 838                 comp.backgroundEraseDisabled = disabled;
 839             }
 840             public boolean getBackgroundEraseDisabled(Component comp) {
 841                 return comp.backgroundEraseDisabled;
 842             }
 843             public Rectangle getBounds(Component comp) {
 844                 return new Rectangle(comp.x, comp.y, comp.width, comp.height);
 845             }
 846             public void setMixingCutoutShape(Component comp, Shape shape) {
 847                 comp.setMixingCutoutShape(shape);
 848             }
 849 
 850             public void setGraphicsConfiguration(Component comp,
 851                     GraphicsConfiguration gc)
 852             {
 853                 comp.setGraphicsConfiguration(gc);
 854             }
 855             public void requestFocus(Component comp, FocusEvent.Cause cause) {
 856                 comp.requestFocus(cause);
 857             }
 858             public boolean canBeFocusOwner(Component comp) {
 859                 return comp.canBeFocusOwner();
 860             }
 861 
 862             public boolean isVisible(Component comp) {
 863                 return comp.isVisible_NoClientCode();
 864             }
 865             public void setRequestFocusController
 866                 (RequestFocusController requestController)
 867             {
 868                  Component.setRequestFocusController(requestController);
 869             }
 870             public AppContext getAppContext(Component comp) {
 871                  return comp.appContext;
 872             }
 873             public void setAppContext(Component comp, AppContext appContext) {
 874                  comp.appContext = appContext;
 875             }
 876             public Container getParent(Component comp) {
 877                 return comp.getParent_NoClientCode();
 878             }
 879             public void setParent(Component comp, Container parent) {
 880                 comp.parent = parent;
 881             }
 882             public void setSize(Component comp, int width, int height) {
 883                 comp.width = width;
 884                 comp.height = height;
 885             }
 886             public Point getLocation(Component comp) {
 887                 return comp.location_NoClientCode();
 888             }
 889             public void setLocation(Component comp, int x, int y) {
 890                 comp.x = x;
 891                 comp.y = y;
 892             }
 893             public boolean isEnabled(Component comp) {
 894                 return comp.isEnabledImpl();
 895             }
 896             public boolean isDisplayable(Component comp) {
 897                 return comp.peer != null;
 898             }
 899             public Cursor getCursor(Component comp) {
 900                 return comp.getCursor_NoClientCode();
 901             }
 902             @SuppressWarnings("unchecked")
 903             public <T extends ComponentPeer> T getPeer(Component comp) {
 904                 return (T) comp.peer;
 905             }
 906             public void setPeer(Component comp, ComponentPeer peer) {
 907                 comp.peer = peer;
 908             }
 909             public boolean isLightweight(Component comp) {
 910                 return (comp.peer instanceof LightweightPeer);
 911             }
 912             public boolean getIgnoreRepaint(Component comp) {
 913                 return comp.ignoreRepaint;
 914             }
 915             public int getWidth(Component comp) {
 916                 return comp.width;
 917             }
 918             public int getHeight(Component comp) {
 919                 return comp.height;
 920             }
 921             public int getX(Component comp) {
 922                 return comp.x;
 923             }
 924             public int getY(Component comp) {
 925                 return comp.y;
 926             }
 927             public Color getForeground(Component comp) {
 928                 return comp.foreground;
 929             }
 930             public Color getBackground(Component comp) {
 931                 return comp.background;
 932             }
 933             public void setBackground(Component comp, Color background) {
 934                 comp.background = background;
 935             }
 936             public Font getFont(Component comp) {
 937                 return comp.getFont_NoClientCode();
 938             }
 939             public void processEvent(Component comp, AWTEvent e) {
 940                 comp.processEvent(e);
 941             }
 942 
 943             public AccessControlContext getAccessControlContext(Component comp) {
 944                 return comp.getAccessControlContext();
 945             }
 946 
 947             public void revalidateSynchronously(Component comp) {
 948                 comp.revalidateSynchronously();
 949             }
 950 
 951             @Override
 952             public void createBufferStrategy(Component comp, int numBuffers,
 953                     BufferCapabilities caps) throws AWTException {
 954                 comp.createBufferStrategy(numBuffers, caps);
 955             }
 956 
 957             @Override
 958             public BufferStrategy getBufferStrategy(Component comp) {
 959                 return comp.getBufferStrategy();
 960             }
 961         });
 962     }
 963 
 964     /**
 965      * Constructs a new component. Class {@code Component} can be
 966      * extended directly to create a lightweight component that does not
 967      * utilize an opaque native window. A lightweight component must be
 968      * hosted by a native container somewhere higher up in the component
 969      * tree (for example, by a {@code Frame} object).
 970      */
 971     protected Component() {
 972         appContext = AppContext.getAppContext();
 973     }
 974 
 975     @SuppressWarnings({"rawtypes", "unchecked"})
 976     void initializeFocusTraversalKeys() {
 977         focusTraversalKeys = new Set[3];
 978     }
 979 
 980     /**
 981      * Constructs a name for this component.  Called by {@code getName}
 982      * when the name is {@code null}.
 983      */
 984     String constructComponentName() {
 985         return null; // For strict compliance with prior platform versions, a Component
 986                      // that doesn't set its name should return null from
 987                      // getName()
 988     }
 989 
 990     /**
 991      * Gets the name of the component.
 992      * @return this component's name
 993      * @see    #setName
 994      * @since 1.1
 995      */
 996     public String getName() {
 997         if (name == null && !nameExplicitlySet) {
 998             synchronized(getObjectLock()) {
 999                 if (name == null && !nameExplicitlySet)
1000                     name = constructComponentName();
1001             }
1002         }
1003         return name;
1004     }
1005 
1006     /**
1007      * Sets the name of the component to the specified string.
1008      * @param name  the string that is to be this
1009      *           component's name
1010      * @see #getName
1011      * @since 1.1
1012      */
1013     public void setName(String name) {
1014         String oldName;
1015         synchronized(getObjectLock()) {
1016             oldName = this.name;
1017             this.name = name;
1018             nameExplicitlySet = true;
1019         }
1020         firePropertyChange("name", oldName, name);
1021     }
1022 
1023     /**
1024      * Gets the parent of this component.
1025      * @return the parent container of this component
1026      * @since 1.0
1027      */
1028     public Container getParent() {
1029         return getParent_NoClientCode();
1030     }
1031 
1032     // NOTE: This method may be called by privileged threads.
1033     //       This functionality is implemented in a package-private method
1034     //       to insure that it cannot be overridden by client subclasses.
1035     //       DO NOT INVOKE CLIENT CODE ON THIS THREAD!
1036     final Container getParent_NoClientCode() {
1037         return parent;
1038     }
1039 
1040     // This method is overridden in the Window class to return null,
1041     //    because the parent field of the Window object contains
1042     //    the owner of the window, not its parent.
1043     Container getContainer() {
1044         return getParent_NoClientCode();
1045     }
1046 
1047     /**
1048      * Associate a {@code DropTarget} with this component.
1049      * The {@code Component} will receive drops only if it
1050      * is enabled.
1051      *
1052      * @see #isEnabled
1053      * @param dt The DropTarget
1054      */
1055 
1056     public synchronized void setDropTarget(DropTarget dt) {
1057         if (dt == dropTarget || (dropTarget != null && dropTarget.equals(dt)))
1058             return;
1059 
1060         DropTarget old;
1061 
1062         if ((old = dropTarget) != null) {
1063             dropTarget.removeNotify();
1064 
1065             DropTarget t = dropTarget;
1066 
1067             dropTarget = null;
1068 
1069             try {
1070                 t.setComponent(null);
1071             } catch (IllegalArgumentException iae) {
1072                 // ignore it.
1073             }
1074         }
1075 
1076         // if we have a new one, and we have a peer, add it!
1077 
1078         if ((dropTarget = dt) != null) {
1079             try {
1080                 dropTarget.setComponent(this);
1081                 dropTarget.addNotify();
1082             } catch (IllegalArgumentException iae) {
1083                 if (old != null) {
1084                     try {
1085                         old.setComponent(this);
1086                         dropTarget.addNotify();
1087                     } catch (IllegalArgumentException iae1) {
1088                         // ignore it!
1089                     }
1090                 }
1091             }
1092         }
1093     }
1094 
1095     /**
1096      * Gets the {@code DropTarget} associated with this
1097      * {@code Component}.
1098      *
1099      * @return the drop target
1100      */
1101 
1102     public synchronized DropTarget getDropTarget() { return dropTarget; }
1103 
1104     /**
1105      * Gets the {@code GraphicsConfiguration} associated with this
1106      * {@code Component}.
1107      * If the {@code Component} has not been assigned a specific
1108      * {@code GraphicsConfiguration},
1109      * the {@code GraphicsConfiguration} of the
1110      * {@code Component} object's top-level container is
1111      * returned.
1112      * If the {@code Component} has been created, but not yet added
1113      * to a {@code Container}, this method returns {@code null}.
1114      *
1115      * @return the {@code GraphicsConfiguration} used by this
1116      *          {@code Component} or {@code null}
1117      * @since 1.3
1118      */
1119     public GraphicsConfiguration getGraphicsConfiguration() {
1120         return getGraphicsConfiguration_NoClientCode();
1121     }
1122 
1123     final GraphicsConfiguration getGraphicsConfiguration_NoClientCode() {
1124         return graphicsConfig;
1125     }
1126 
1127     void setGraphicsConfiguration(GraphicsConfiguration gc) {
1128         synchronized(getTreeLock()) {
1129             if (updateGraphicsData(gc)) {
1130                 removeNotify();
1131                 addNotify();
1132             }
1133         }
1134     }
1135 
1136     boolean updateGraphicsData(GraphicsConfiguration gc) {
1137         checkTreeLock();
1138 
1139         if (graphicsConfig == gc) {
1140             return false;
1141         }
1142 
1143         graphicsConfig = gc;
1144 
1145         ComponentPeer peer = this.peer;
1146         if (peer != null) {
1147             return peer.updateGraphicsData(gc);
1148         }
1149         return false;
1150     }
1151 
1152     /**
1153      * Checks that this component's {@code GraphicsDevice}
1154      * {@code idString} matches the string argument.
1155      */
1156     void checkGD(String stringID) {
1157         if (graphicsConfig != null) {
1158             if (!graphicsConfig.getDevice().getIDstring().equals(stringID)) {
1159                 throw new IllegalArgumentException(
1160                                                    "adding a container to a container on a different GraphicsDevice");
1161             }
1162         }
1163     }
1164 
1165     /**
1166      * Gets this component's locking object (the object that owns the thread
1167      * synchronization monitor) for AWT component-tree and layout
1168      * operations.
1169      * @return this component's locking object
1170      */
1171     public final Object getTreeLock() {
1172         return LOCK;
1173     }
1174 
1175     final void checkTreeLock() {
1176         if (!Thread.holdsLock(getTreeLock())) {
1177             throw new IllegalStateException("This function should be called while holding treeLock");
1178         }
1179     }
1180 
1181     /**
1182      * Gets the toolkit of this component. Note that
1183      * the frame that contains a component controls which
1184      * toolkit is used by that component. Therefore if the component
1185      * is moved from one frame to another, the toolkit it uses may change.
1186      * @return  the toolkit of this component
1187      * @since 1.0
1188      */
1189     public Toolkit getToolkit() {
1190         return getToolkitImpl();
1191     }
1192 
1193     /*
1194      * This is called by the native code, so client code can't
1195      * be called on the toolkit thread.
1196      */
1197     final Toolkit getToolkitImpl() {
1198         Container parent = this.parent;
1199         if (parent != null) {
1200             return parent.getToolkitImpl();
1201         }
1202         return Toolkit.getDefaultToolkit();
1203     }
1204 
1205     final ComponentFactory getComponentFactory() {
1206         final Toolkit toolkit = getToolkit();
1207         if (toolkit instanceof ComponentFactory) {
1208             return (ComponentFactory) toolkit;
1209         }
1210         throw new AWTError("UI components are unsupported by: " + toolkit);
1211     }
1212 
1213     /**
1214      * Determines whether this component is valid. A component is valid
1215      * when it is correctly sized and positioned within its parent
1216      * container and all its children are also valid.
1217      * In order to account for peers' size requirements, components are invalidated
1218      * before they are first shown on the screen. By the time the parent container
1219      * is fully realized, all its components will be valid.
1220      * @return {@code true} if the component is valid, {@code false}
1221      * otherwise
1222      * @see #validate
1223      * @see #invalidate
1224      * @since 1.0
1225      */
1226     public boolean isValid() {
1227         return (peer != null) && valid;
1228     }
1229 
1230     /**
1231      * Determines whether this component is displayable. A component is
1232      * displayable when it is connected to a native screen resource.
1233      * <p>
1234      * A component is made displayable either when it is added to
1235      * a displayable containment hierarchy or when its containment
1236      * hierarchy is made displayable.
1237      * A containment hierarchy is made displayable when its ancestor
1238      * window is either packed or made visible.
1239      * <p>
1240      * A component is made undisplayable either when it is removed from
1241      * a displayable containment hierarchy or when its containment hierarchy
1242      * is made undisplayable.  A containment hierarchy is made
1243      * undisplayable when its ancestor window is disposed.
1244      *
1245      * @return {@code true} if the component is displayable,
1246      * {@code false} otherwise
1247      * @see Container#add(Component)
1248      * @see Window#pack
1249      * @see Window#show
1250      * @see Container#remove(Component)
1251      * @see Window#dispose
1252      * @since 1.2
1253      */
1254     public boolean isDisplayable() {
1255         return peer != null;
1256     }
1257 
1258     /**
1259      * Determines whether this component should be visible when its
1260      * parent is visible. Components are
1261      * initially visible, with the exception of top level components such
1262      * as {@code Frame} objects.
1263      * @return {@code true} if the component is visible,
1264      * {@code false} otherwise
1265      * @see #setVisible
1266      * @since 1.0
1267      */
1268     @Transient
1269     public boolean isVisible() {
1270         return isVisible_NoClientCode();
1271     }
1272     final boolean isVisible_NoClientCode() {
1273         return visible;
1274     }
1275 
1276     /**
1277      * Determines whether this component will be displayed on the screen.
1278      * @return {@code true} if the component and all of its ancestors
1279      *          until a toplevel window or null parent are visible,
1280      *          {@code false} otherwise
1281      */
1282     boolean isRecursivelyVisible() {
1283         return visible && (parent == null || parent.isRecursivelyVisible());
1284     }
1285 
1286     /**
1287      * Determines the bounds of a visible part of the component relative to its
1288      * parent.
1289      *
1290      * @return the visible part of bounds
1291      */
1292     private Rectangle getRecursivelyVisibleBounds() {
1293         final Component container = getContainer();
1294         final Rectangle bounds = getBounds();
1295         if (container == null) {
1296             // we are top level window or haven't a container, return our bounds
1297             return bounds;
1298         }
1299         // translate the container's bounds to our coordinate space
1300         final Rectangle parentsBounds = container.getRecursivelyVisibleBounds();
1301         parentsBounds.setLocation(0, 0);
1302         return parentsBounds.intersection(bounds);
1303     }
1304 
1305     /**
1306      * Translates absolute coordinates into coordinates in the coordinate
1307      * space of this component.
1308      */
1309     Point pointRelativeToComponent(Point absolute) {
1310         Point compCoords = getLocationOnScreen();
1311         return new Point(absolute.x - compCoords.x,
1312                          absolute.y - compCoords.y);
1313     }
1314 
1315     /**
1316      * Assuming that mouse location is stored in PointerInfo passed
1317      * to this method, it finds a Component that is in the same
1318      * Window as this Component and is located under the mouse pointer.
1319      * If no such Component exists, null is returned.
1320      * NOTE: this method should be called under the protection of
1321      * tree lock, as it is done in Component.getMousePosition() and
1322      * Container.getMousePosition(boolean).
1323      */
1324     Component findUnderMouseInWindow(PointerInfo pi) {
1325         if (!isShowing()) {
1326             return null;
1327         }
1328         Window win = getContainingWindow();
1329         Toolkit toolkit = Toolkit.getDefaultToolkit();
1330         if (!(toolkit instanceof ComponentFactory)) {
1331             return null;
1332         }
1333         if (!((ComponentFactory) toolkit).getMouseInfoPeer().isWindowUnderMouse(win)) {
1334             return null;
1335         }
1336         final boolean INCLUDE_DISABLED = true;
1337         Point relativeToWindow = win.pointRelativeToComponent(pi.getLocation());
1338         Component inTheSameWindow = win.findComponentAt(relativeToWindow.x,
1339                                                         relativeToWindow.y,
1340                                                         INCLUDE_DISABLED);
1341         return inTheSameWindow;
1342     }
1343 
1344     /**
1345      * Returns the position of the mouse pointer in this {@code Component}'s
1346      * coordinate space if the {@code Component} is directly under the mouse
1347      * pointer, otherwise returns {@code null}.
1348      * If the {@code Component} is not showing on the screen, this method
1349      * returns {@code null} even if the mouse pointer is above the area
1350      * where the {@code Component} would be displayed.
1351      * If the {@code Component} is partially or fully obscured by other
1352      * {@code Component}s or native windows, this method returns a non-null
1353      * value only if the mouse pointer is located above the unobscured part of the
1354      * {@code Component}.
1355      * <p>
1356      * For {@code Container}s it returns a non-null value if the mouse is
1357      * above the {@code Container} itself or above any of its descendants.
1358      * Use {@link Container#getMousePosition(boolean)} if you need to exclude children.
1359      * <p>
1360      * Sometimes the exact mouse coordinates are not important, and the only thing
1361      * that matters is whether a specific {@code Component} is under the mouse
1362      * pointer. If the return value of this method is {@code null}, mouse
1363      * pointer is not directly above the {@code Component}.
1364      *
1365      * @exception HeadlessException if GraphicsEnvironment.isHeadless() returns true
1366      * @see       #isShowing
1367      * @see       Container#getMousePosition
1368      * @return    mouse coordinates relative to this {@code Component}, or null
1369      * @since     1.5
1370      */
1371     public Point getMousePosition() throws HeadlessException {
1372         if (GraphicsEnvironment.isHeadless()) {
1373             throw new HeadlessException();
1374         }
1375 
1376         PointerInfo pi = java.security.AccessController.doPrivileged(
1377                                                                      new java.security.PrivilegedAction<PointerInfo>() {
1378                                                                          public PointerInfo run() {
1379                                                                              return MouseInfo.getPointerInfo();
1380                                                                          }
1381                                                                      }
1382                                                                      );
1383 
1384         synchronized (getTreeLock()) {
1385             Component inTheSameWindow = findUnderMouseInWindow(pi);
1386             if (!isSameOrAncestorOf(inTheSameWindow, true)) {
1387                 return null;
1388             }
1389             return pointRelativeToComponent(pi.getLocation());
1390         }
1391     }
1392 
1393     /**
1394      * Overridden in Container. Must be called under TreeLock.
1395      */
1396     boolean isSameOrAncestorOf(Component comp, boolean allowChildren) {
1397         return comp == this;
1398     }
1399 
1400     /**
1401      * Determines whether this component is showing on screen. This means
1402      * that the component must be visible, and it must be in a container
1403      * that is visible and showing.
1404      * <p>
1405      * <strong>Note:</strong> sometimes there is no way to detect whether the
1406      * {@code Component} is actually visible to the user.  This can happen when:
1407      * <ul>
1408      * <li>the component has been added to a visible {@code ScrollPane} but
1409      * the {@code Component} is not currently in the scroll pane's view port.
1410      * <li>the {@code Component} is obscured by another {@code Component} or
1411      * {@code Container}.
1412      * </ul>
1413      * @return {@code true} if the component is showing,
1414      *          {@code false} otherwise
1415      * @see #setVisible
1416      * @since 1.0
1417      */
1418     public boolean isShowing() {
1419         if (visible && (peer != null)) {
1420             Container parent = this.parent;
1421             return (parent == null) || parent.isShowing();
1422         }
1423         return false;
1424     }
1425 
1426     /**
1427      * Determines whether this component is enabled. An enabled component
1428      * can respond to user input and generate events. Components are
1429      * enabled initially by default. A component may be enabled or disabled by
1430      * calling its {@code setEnabled} method.
1431      * @return {@code true} if the component is enabled,
1432      *          {@code false} otherwise
1433      * @see #setEnabled
1434      * @since 1.0
1435      */
1436     public boolean isEnabled() {
1437         return isEnabledImpl();
1438     }
1439 
1440     /*
1441      * This is called by the native code, so client code can't
1442      * be called on the toolkit thread.
1443      */
1444     final boolean isEnabledImpl() {
1445         return enabled;
1446     }
1447 
1448     /**
1449      * Enables or disables this component, depending on the value of the
1450      * parameter {@code b}. An enabled component can respond to user
1451      * input and generate events. Components are enabled initially by default.
1452      *
1453      * <p>Note: Disabling a lightweight component does not prevent it from
1454      * receiving MouseEvents.
1455      * <p>Note: Disabling a heavyweight container prevents all components
1456      * in this container from receiving any input events.  But disabling a
1457      * lightweight container affects only this container.
1458      *
1459      * @param     b   If {@code true}, this component is
1460      *            enabled; otherwise this component is disabled
1461      * @see #isEnabled
1462      * @see #isLightweight
1463      * @since 1.1
1464      */
1465     public void setEnabled(boolean b) {
1466         enable(b);
1467     }
1468 
1469     /**
1470      * @deprecated As of JDK version 1.1,
1471      * replaced by {@code setEnabled(boolean)}.
1472      */
1473     @Deprecated
1474     public void enable() {
1475         if (!enabled) {
1476             synchronized (getTreeLock()) {
1477                 enabled = true;
1478                 ComponentPeer peer = this.peer;
1479                 if (peer != null) {
1480                     peer.setEnabled(true);
1481                     if (visible && !getRecursivelyVisibleBounds().isEmpty()) {
1482                         updateCursorImmediately();
1483                     }
1484                 }
1485             }
1486             if (accessibleContext != null) {
1487                 accessibleContext.firePropertyChange(
1488                                                      AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
1489                                                      null, AccessibleState.ENABLED);
1490             }
1491         }
1492     }
1493 
1494     /**
1495      * Enables or disables this component.
1496      *
1497      * @param  b {@code true} to enable this component;
1498      *         otherwise {@code false}
1499      *
1500      * @deprecated As of JDK version 1.1,
1501      * replaced by {@code setEnabled(boolean)}.
1502      */
1503     @Deprecated
1504     public void enable(boolean b) {
1505         if (b) {
1506             enable();
1507         } else {
1508             disable();
1509         }
1510     }
1511 
1512     /**
1513      * @deprecated As of JDK version 1.1,
1514      * replaced by {@code setEnabled(boolean)}.
1515      */
1516     @Deprecated
1517     public void disable() {
1518         if (enabled) {
1519             KeyboardFocusManager.clearMostRecentFocusOwner(this);
1520             synchronized (getTreeLock()) {
1521                 enabled = false;
1522                 // A disabled lw container is allowed to contain a focus owner.
1523                 if ((isFocusOwner() || (containsFocus() && !isLightweight())) &&
1524                     KeyboardFocusManager.isAutoFocusTransferEnabled())
1525                 {
1526                     // Don't clear the global focus owner. If transferFocus
1527                     // fails, we want the focus to stay on the disabled
1528                     // Component so that keyboard traversal, et. al. still
1529                     // makes sense to the user.
1530                     transferFocus(false);
1531                 }
1532                 ComponentPeer peer = this.peer;
1533                 if (peer != null) {
1534                     peer.setEnabled(false);
1535                     if (visible && !getRecursivelyVisibleBounds().isEmpty()) {
1536                         updateCursorImmediately();
1537                     }
1538                 }
1539             }
1540             if (accessibleContext != null) {
1541                 accessibleContext.firePropertyChange(
1542                                                      AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
1543                                                      null, AccessibleState.ENABLED);
1544             }
1545         }
1546     }
1547 
1548     /**
1549      * Returns true if this component is painted to an offscreen image
1550      * ("buffer") that's copied to the screen later.  Component
1551      * subclasses that support double buffering should override this
1552      * method to return true if double buffering is enabled.
1553      *
1554      * @return false by default
1555      */
1556     public boolean isDoubleBuffered() {
1557         return false;
1558     }
1559 
1560     /**
1561      * Enables or disables input method support for this component. If input
1562      * method support is enabled and the component also processes key events,
1563      * incoming events are offered to
1564      * the current input method and will only be processed by the component or
1565      * dispatched to its listeners if the input method does not consume them.
1566      * By default, input method support is enabled.
1567      *
1568      * @param enable true to enable, false to disable
1569      * @see #processKeyEvent
1570      * @since 1.2
1571      */
1572     public void enableInputMethods(boolean enable) {
1573         if (enable) {
1574             if ((eventMask & AWTEvent.INPUT_METHODS_ENABLED_MASK) != 0)
1575                 return;
1576 
1577             // If this component already has focus, then activate the
1578             // input method by dispatching a synthesized focus gained
1579             // event.
1580             if (isFocusOwner()) {
1581                 InputContext inputContext = getInputContext();
1582                 if (inputContext != null) {
1583                     FocusEvent focusGainedEvent =
1584                         new FocusEvent(this, FocusEvent.FOCUS_GAINED);
1585                     inputContext.dispatchEvent(focusGainedEvent);
1586                 }
1587             }
1588 
1589             eventMask |= AWTEvent.INPUT_METHODS_ENABLED_MASK;
1590         } else {
1591             if ((eventMask & AWTEvent.INPUT_METHODS_ENABLED_MASK) != 0) {
1592                 InputContext inputContext = getInputContext();
1593                 if (inputContext != null) {
1594                     inputContext.endComposition();
1595                     inputContext.removeNotify(this);
1596                 }
1597             }
1598             eventMask &= ~AWTEvent.INPUT_METHODS_ENABLED_MASK;
1599         }
1600     }
1601 
1602     /**
1603      * Shows or hides this component depending on the value of parameter
1604      * {@code b}.
1605      * <p>
1606      * This method changes layout-related information, and therefore,
1607      * invalidates the component hierarchy.
1608      *
1609      * @param b  if {@code true}, shows this component;
1610      * otherwise, hides this component
1611      * @see #isVisible
1612      * @see #invalidate
1613      * @since 1.1
1614      */
1615     public void setVisible(boolean b) {
1616         show(b);
1617     }
1618 
1619     /**
1620      * @deprecated As of JDK version 1.1,
1621      * replaced by {@code setVisible(boolean)}.
1622      */
1623     @Deprecated
1624     public void show() {
1625         if (!visible) {
1626             synchronized (getTreeLock()) {
1627                 visible = true;
1628                 mixOnShowing();
1629                 ComponentPeer peer = this.peer;
1630                 if (peer != null) {
1631                     peer.setVisible(true);
1632                     createHierarchyEvents(HierarchyEvent.HIERARCHY_CHANGED,
1633                                           this, parent,
1634                                           HierarchyEvent.SHOWING_CHANGED,
1635                                           Toolkit.enabledOnToolkit(AWTEvent.HIERARCHY_EVENT_MASK));
1636                     if (peer instanceof LightweightPeer) {
1637                         repaint();
1638                     }
1639                     updateCursorImmediately();
1640                 }
1641 
1642                 if (componentListener != null ||
1643                     (eventMask & AWTEvent.COMPONENT_EVENT_MASK) != 0 ||
1644                     Toolkit.enabledOnToolkit(AWTEvent.COMPONENT_EVENT_MASK)) {
1645                     ComponentEvent e = new ComponentEvent(this,
1646                                                           ComponentEvent.COMPONENT_SHOWN);
1647                     Toolkit.getEventQueue().postEvent(e);
1648                 }
1649             }
1650             Container parent = this.parent;
1651             if (parent != null) {
1652                 parent.invalidate();
1653             }
1654         }
1655     }
1656 
1657     /**
1658      * Makes this component visible or invisible.
1659      *
1660      * @param  b {@code true} to make this component visible;
1661      *         otherwise {@code false}
1662      *
1663      * @deprecated As of JDK version 1.1,
1664      * replaced by {@code setVisible(boolean)}.
1665      */
1666     @Deprecated
1667     public void show(boolean b) {
1668         if (b) {
1669             show();
1670         } else {
1671             hide();
1672         }
1673     }
1674 
1675     boolean containsFocus() {
1676         return isFocusOwner();
1677     }
1678 
1679     void clearMostRecentFocusOwnerOnHide() {
1680         KeyboardFocusManager.clearMostRecentFocusOwner(this);
1681     }
1682 
1683     void clearCurrentFocusCycleRootOnHide() {
1684         /* do nothing */
1685     }
1686 
1687     /**
1688      * @deprecated As of JDK version 1.1,
1689      * replaced by {@code setVisible(boolean)}.
1690      */
1691     @Deprecated
1692     public void hide() {
1693         isPacked = false;
1694 
1695         if (visible) {
1696             clearCurrentFocusCycleRootOnHide();
1697             clearMostRecentFocusOwnerOnHide();
1698             synchronized (getTreeLock()) {
1699                 visible = false;
1700                 mixOnHiding(isLightweight());
1701                 if (containsFocus() && KeyboardFocusManager.isAutoFocusTransferEnabled()) {
1702                     transferFocus(true);
1703                 }
1704                 ComponentPeer peer = this.peer;
1705                 if (peer != null) {
1706                     peer.setVisible(false);
1707                     createHierarchyEvents(HierarchyEvent.HIERARCHY_CHANGED,
1708                                           this, parent,
1709                                           HierarchyEvent.SHOWING_CHANGED,
1710                                           Toolkit.enabledOnToolkit(AWTEvent.HIERARCHY_EVENT_MASK));
1711                     if (peer instanceof LightweightPeer) {
1712                         repaint();
1713                     }
1714                     updateCursorImmediately();
1715                 }
1716                 if (componentListener != null ||
1717                     (eventMask & AWTEvent.COMPONENT_EVENT_MASK) != 0 ||
1718                     Toolkit.enabledOnToolkit(AWTEvent.COMPONENT_EVENT_MASK)) {
1719                     ComponentEvent e = new ComponentEvent(this,
1720                                                           ComponentEvent.COMPONENT_HIDDEN);
1721                     Toolkit.getEventQueue().postEvent(e);
1722                 }
1723             }
1724             Container parent = this.parent;
1725             if (parent != null) {
1726                 parent.invalidate();
1727             }
1728         }
1729     }
1730 
1731     /**
1732      * Gets the foreground color of this component.
1733      * @return this component's foreground color; if this component does
1734      * not have a foreground color, the foreground color of its parent
1735      * is returned
1736      * @see #setForeground
1737      * @since 1.0
1738      */
1739     @Transient
1740     public Color getForeground() {
1741         Color foreground = this.foreground;
1742         if (foreground != null) {
1743             return foreground;
1744         }
1745         Container parent = this.parent;
1746         return (parent != null) ? parent.getForeground() : null;
1747     }
1748 
1749     /**
1750      * Sets the foreground color of this component.
1751      * @param c the color to become this component's
1752      *          foreground color; if this parameter is {@code null}
1753      *          then this component will inherit
1754      *          the foreground color of its parent
1755      * @see #getForeground
1756      * @since 1.0
1757      */
1758     public void setForeground(Color c) {
1759         Color oldColor = foreground;
1760         ComponentPeer peer = this.peer;
1761         foreground = c;
1762         if (peer != null) {
1763             c = getForeground();
1764             if (c != null) {
1765                 peer.setForeground(c);
1766             }
1767         }
1768         // This is a bound property, so report the change to
1769         // any registered listeners.  (Cheap if there are none.)
1770         firePropertyChange("foreground", oldColor, c);
1771     }
1772 
1773     /**
1774      * Returns whether the foreground color has been explicitly set for this
1775      * Component. If this method returns {@code false}, this Component is
1776      * inheriting its foreground color from an ancestor.
1777      *
1778      * @return {@code true} if the foreground color has been explicitly
1779      *         set for this Component; {@code false} otherwise.
1780      * @since 1.4
1781      */
1782     public boolean isForegroundSet() {
1783         return (foreground != null);
1784     }
1785 
1786     /**
1787      * Gets the background color of this component.
1788      * @return this component's background color; if this component does
1789      *          not have a background color,
1790      *          the background color of its parent is returned
1791      * @see #setBackground
1792      * @since 1.0
1793      */
1794     @Transient
1795     public Color getBackground() {
1796         Color background = this.background;
1797         if (background != null) {
1798             return background;
1799         }
1800         Container parent = this.parent;
1801         return (parent != null) ? parent.getBackground() : null;
1802     }
1803 
1804     /**
1805      * Sets the background color of this component.
1806      * <p>
1807      * The background color affects each component differently and the
1808      * parts of the component that are affected by the background color
1809      * may differ between operating systems.
1810      *
1811      * @param c the color to become this component's color;
1812      *          if this parameter is {@code null}, then this
1813      *          component will inherit the background color of its parent
1814      * @see #getBackground
1815      * @since 1.0
1816      */
1817     public void setBackground(Color c) {
1818         Color oldColor = background;
1819         ComponentPeer peer = this.peer;
1820         background = c;
1821         if (peer != null) {
1822             c = getBackground();
1823             if (c != null) {
1824                 peer.setBackground(c);
1825             }
1826         }
1827         // This is a bound property, so report the change to
1828         // any registered listeners.  (Cheap if there are none.)
1829         firePropertyChange("background", oldColor, c);
1830     }
1831 
1832     /**
1833      * Returns whether the background color has been explicitly set for this
1834      * Component. If this method returns {@code false}, this Component is
1835      * inheriting its background color from an ancestor.
1836      *
1837      * @return {@code true} if the background color has been explicitly
1838      *         set for this Component; {@code false} otherwise.
1839      * @since 1.4
1840      */
1841     public boolean isBackgroundSet() {
1842         return (background != null);
1843     }
1844 
1845     /**
1846      * Gets the font of this component.
1847      * @return this component's font; if a font has not been set
1848      * for this component, the font of its parent is returned
1849      * @see #setFont
1850      * @since 1.0
1851      */
1852     @Transient
1853     public Font getFont() {
1854         return getFont_NoClientCode();
1855     }
1856 
1857     // NOTE: This method may be called by privileged threads.
1858     //       This functionality is implemented in a package-private method
1859     //       to insure that it cannot be overridden by client subclasses.
1860     //       DO NOT INVOKE CLIENT CODE ON THIS THREAD!
1861     final Font getFont_NoClientCode() {
1862         Font font = this.font;
1863         if (font != null) {
1864             return font;
1865         }
1866         Container parent = this.parent;
1867         return (parent != null) ? parent.getFont_NoClientCode() : null;
1868     }
1869 
1870     /**
1871      * Sets the font of this component.
1872      * <p>
1873      * This method changes layout-related information, and therefore,
1874      * invalidates the component hierarchy.
1875      *
1876      * @param f the font to become this component's font;
1877      *          if this parameter is {@code null} then this
1878      *          component will inherit the font of its parent
1879      * @see #getFont
1880      * @see #invalidate
1881      * @since 1.0
1882      */
1883     public void setFont(Font f) {
1884         Font oldFont, newFont;
1885         synchronized(getTreeLock()) {
1886             oldFont = font;
1887             newFont = font = f;
1888             ComponentPeer peer = this.peer;
1889             if (peer != null) {
1890                 f = getFont();
1891                 if (f != null) {
1892                     peer.setFont(f);
1893                     peerFont = f;
1894                 }
1895             }
1896         }
1897         // This is a bound property, so report the change to
1898         // any registered listeners.  (Cheap if there are none.)
1899         firePropertyChange("font", oldFont, newFont);
1900 
1901         // This could change the preferred size of the Component.
1902         // Fix for 6213660. Should compare old and new fonts and do not
1903         // call invalidate() if they are equal.
1904         if (f != oldFont && (oldFont == null ||
1905                                       !oldFont.equals(f))) {
1906             invalidateIfValid();
1907         }
1908     }
1909 
1910     /**
1911      * Returns whether the font has been explicitly set for this Component. If
1912      * this method returns {@code false}, this Component is inheriting its
1913      * font from an ancestor.
1914      *
1915      * @return {@code true} if the font has been explicitly set for this
1916      *         Component; {@code false} otherwise.
1917      * @since 1.4
1918      */
1919     public boolean isFontSet() {
1920         return (font != null);
1921     }
1922 
1923     /**
1924      * Gets the locale of this component.
1925      * @return this component's locale; if this component does not
1926      *          have a locale, the locale of its parent is returned
1927      * @see #setLocale
1928      * @exception IllegalComponentStateException if the {@code Component}
1929      *          does not have its own locale and has not yet been added to
1930      *          a containment hierarchy such that the locale can be determined
1931      *          from the containing parent
1932      * @since  1.1
1933      */
1934     public Locale getLocale() {
1935         Locale locale = this.locale;
1936         if (locale != null) {
1937             return locale;
1938         }
1939         Container parent = this.parent;
1940 
1941         if (parent == null) {
1942             throw new IllegalComponentStateException("This component must have a parent in order to determine its locale");
1943         } else {
1944             return parent.getLocale();
1945         }
1946     }
1947 
1948     /**
1949      * Sets the locale of this component.  This is a bound property.
1950      * <p>
1951      * This method changes layout-related information, and therefore,
1952      * invalidates the component hierarchy.
1953      *
1954      * @param l the locale to become this component's locale
1955      * @see #getLocale
1956      * @see #invalidate
1957      * @since 1.1
1958      */
1959     public void setLocale(Locale l) {
1960         Locale oldValue = locale;
1961         locale = l;
1962 
1963         // This is a bound property, so report the change to
1964         // any registered listeners.  (Cheap if there are none.)
1965         firePropertyChange("locale", oldValue, l);
1966 
1967         // This could change the preferred size of the Component.
1968         invalidateIfValid();
1969     }
1970 
1971     /**
1972      * Gets the instance of {@code ColorModel} used to display
1973      * the component on the output device.
1974      * @return the color model used by this component
1975      * @see java.awt.image.ColorModel
1976      * @see java.awt.peer.ComponentPeer#getColorModel()
1977      * @see Toolkit#getColorModel()
1978      * @since 1.0
1979      */
1980     public ColorModel getColorModel() {
1981         ComponentPeer peer = this.peer;
1982         if ((peer != null) && ! (peer instanceof LightweightPeer)) {
1983             return peer.getColorModel();
1984         } else if (GraphicsEnvironment.isHeadless()) {
1985             return ColorModel.getRGBdefault();
1986         } // else
1987         return getToolkit().getColorModel();
1988     }
1989 
1990     /**
1991      * Gets the location of this component in the form of a
1992      * point specifying the component's top-left corner.
1993      * The location will be relative to the parent's coordinate space.
1994      * <p>
1995      * Due to the asynchronous nature of native event handling, this
1996      * method can return outdated values (for instance, after several calls
1997      * of {@code setLocation()} in rapid succession).  For this
1998      * reason, the recommended method of obtaining a component's position is
1999      * within {@code java.awt.event.ComponentListener.componentMoved()},
2000      * which is called after the operating system has finished moving the
2001      * component.
2002      * </p>
2003      * @return an instance of {@code Point} representing
2004      *          the top-left corner of the component's bounds in
2005      *          the coordinate space of the component's parent
2006      * @see #setLocation
2007      * @see #getLocationOnScreen
2008      * @since 1.1
2009      */
2010     public Point getLocation() {
2011         return location();
2012     }
2013 
2014     /**
2015      * Gets the location of this component in the form of a point
2016      * specifying the component's top-left corner in the screen's
2017      * coordinate space.
2018      * @return an instance of {@code Point} representing
2019      *          the top-left corner of the component's bounds in the
2020      *          coordinate space of the screen
2021      * @throws IllegalComponentStateException if the
2022      *          component is not showing on the screen
2023      * @see #setLocation
2024      * @see #getLocation
2025      */
2026     public Point getLocationOnScreen() {
2027         synchronized (getTreeLock()) {
2028             return getLocationOnScreen_NoTreeLock();
2029         }
2030     }
2031 
2032     /*
2033      * a package private version of getLocationOnScreen
2034      * used by GlobalCursormanager to update cursor
2035      */
2036     final Point getLocationOnScreen_NoTreeLock() {
2037 
2038         if (peer != null && isShowing()) {
2039             if (peer instanceof LightweightPeer) {
2040                 // lightweight component location needs to be translated
2041                 // relative to a native component.
2042                 Container host = getNativeContainer();
2043                 Point pt = host.peer.getLocationOnScreen();
2044                 for(Component c = this; c != host; c = c.getParent()) {
2045                     pt.x += c.x;
2046                     pt.y += c.y;
2047                 }
2048                 return pt;
2049             } else {
2050                 Point pt = peer.getLocationOnScreen();
2051                 return pt;
2052             }
2053         } else {
2054             throw new IllegalComponentStateException("component must be showing on the screen to determine its location");
2055         }
2056     }
2057 
2058 
2059     /**
2060      * Returns the location of this component's top left corner.
2061      *
2062      * @return the location of this component's top left corner
2063      * @deprecated As of JDK version 1.1,
2064      * replaced by {@code getLocation()}.
2065      */
2066     @Deprecated
2067     public Point location() {
2068         return location_NoClientCode();
2069     }
2070 
2071     private Point location_NoClientCode() {
2072         return new Point(x, y);
2073     }
2074 
2075     /**
2076      * Moves this component to a new location. The top-left corner of
2077      * the new location is specified by the {@code x} and {@code y}
2078      * parameters in the coordinate space of this component's parent.
2079      * <p>
2080      * This method changes layout-related information, and therefore,
2081      * invalidates the component hierarchy.
2082      *
2083      * @param x the <i>x</i>-coordinate of the new location's
2084      *          top-left corner in the parent's coordinate space
2085      * @param y the <i>y</i>-coordinate of the new location's
2086      *          top-left corner in the parent's coordinate space
2087      * @see #getLocation
2088      * @see #setBounds
2089      * @see #invalidate
2090      * @since 1.1
2091      */
2092     public void setLocation(int x, int y) {
2093         move(x, y);
2094     }
2095 
2096     /**
2097      * Moves this component to a new location.
2098      *
2099      * @param  x the <i>x</i>-coordinate of the new location's
2100      *           top-left corner in the parent's coordinate space
2101      * @param  y the <i>y</i>-coordinate of the new location's
2102      *           top-left corner in the parent's coordinate space
2103      *
2104      * @deprecated As of JDK version 1.1,
2105      * replaced by {@code setLocation(int, int)}.
2106      */
2107     @Deprecated
2108     public void move(int x, int y) {
2109         synchronized(getTreeLock()) {
2110             setBoundsOp(ComponentPeer.SET_LOCATION);
2111             setBounds(x, y, width, height);
2112         }
2113     }
2114 
2115     /**
2116      * Moves this component to a new location. The top-left corner of
2117      * the new location is specified by point {@code p}. Point
2118      * {@code p} is given in the parent's coordinate space.
2119      * <p>
2120      * This method changes layout-related information, and therefore,
2121      * invalidates the component hierarchy.
2122      *
2123      * @param p the point defining the top-left corner
2124      *          of the new location, given in the coordinate space of this
2125      *          component's parent
2126      * @see #getLocation
2127      * @see #setBounds
2128      * @see #invalidate
2129      * @since 1.1
2130      */
2131     public void setLocation(Point p) {
2132         setLocation(p.x, p.y);
2133     }
2134 
2135     /**
2136      * Returns the size of this component in the form of a
2137      * {@code Dimension} object. The {@code height}
2138      * field of the {@code Dimension} object contains
2139      * this component's height, and the {@code width}
2140      * field of the {@code Dimension} object contains
2141      * this component's width.
2142      * @return a {@code Dimension} object that indicates the
2143      *          size of this component
2144      * @see #setSize
2145      * @since 1.1
2146      */
2147     public Dimension getSize() {
2148         return size();
2149     }
2150 
2151     /**
2152      * Returns the size of this component in the form of a
2153      * {@code Dimension} object.
2154      *
2155      * @return the {@code Dimension} object that indicates the
2156      *         size of this component
2157      * @deprecated As of JDK version 1.1,
2158      * replaced by {@code getSize()}.
2159      */
2160     @Deprecated
2161     public Dimension size() {
2162         return new Dimension(width, height);
2163     }
2164 
2165     /**
2166      * Resizes this component so that it has width {@code width}
2167      * and height {@code height}.
2168      * <p>
2169      * This method changes layout-related information, and therefore,
2170      * invalidates the component hierarchy.
2171      *
2172      * @param width the new width of this component in pixels
2173      * @param height the new height of this component in pixels
2174      * @see #getSize
2175      * @see #setBounds
2176      * @see #invalidate
2177      * @since 1.1
2178      */
2179     public void setSize(int width, int height) {
2180         resize(width, height);
2181     }
2182 
2183     /**
2184      * Resizes this component.
2185      *
2186      * @param  width the new width of the component
2187      * @param  height the new height of the component
2188      * @deprecated As of JDK version 1.1,
2189      * replaced by {@code setSize(int, int)}.
2190      */
2191     @Deprecated
2192     public void resize(int width, int height) {
2193         synchronized(getTreeLock()) {
2194             setBoundsOp(ComponentPeer.SET_SIZE);
2195             setBounds(x, y, width, height);
2196         }
2197     }
2198 
2199     /**
2200      * Resizes this component so that it has width {@code d.width}
2201      * and height {@code d.height}.
2202      * <p>
2203      * This method changes layout-related information, and therefore,
2204      * invalidates the component hierarchy.
2205      *
2206      * @param d the dimension specifying the new size
2207      *          of this component
2208      * @throws NullPointerException if {@code d} is {@code null}
2209      * @see #setSize
2210      * @see #setBounds
2211      * @see #invalidate
2212      * @since 1.1
2213      */
2214     public void setSize(Dimension d) {
2215         resize(d);
2216     }
2217 
2218     /**
2219      * Resizes this component so that it has width {@code d.width}
2220      * and height {@code d.height}.
2221      *
2222      * @param  d the new size of this component
2223      * @deprecated As of JDK version 1.1,
2224      * replaced by {@code setSize(Dimension)}.
2225      */
2226     @Deprecated
2227     public void resize(Dimension d) {
2228         setSize(d.width, d.height);
2229     }
2230 
2231     /**
2232      * Gets the bounds of this component in the form of a
2233      * {@code Rectangle} object. The bounds specify this
2234      * component's width, height, and location relative to
2235      * its parent.
2236      * @return a rectangle indicating this component's bounds
2237      * @see #setBounds
2238      * @see #getLocation
2239      * @see #getSize
2240      */
2241     public Rectangle getBounds() {
2242         return bounds();
2243     }
2244 
2245     /**
2246      * Returns the bounding rectangle of this component.
2247      *
2248      * @return the bounding rectangle for this component
2249      * @deprecated As of JDK version 1.1,
2250      * replaced by {@code getBounds()}.
2251      */
2252     @Deprecated
2253     public Rectangle bounds() {
2254         return new Rectangle(x, y, width, height);
2255     }
2256 
2257     /**
2258      * Moves and resizes this component. The new location of the top-left
2259      * corner is specified by {@code x} and {@code y}, and the
2260      * new size is specified by {@code width} and {@code height}.
2261      * <p>
2262      * This method changes layout-related information, and therefore,
2263      * invalidates the component hierarchy.
2264      *
2265      * @param x the new <i>x</i>-coordinate of this component
2266      * @param y the new <i>y</i>-coordinate of this component
2267      * @param width the new {@code width} of this component
2268      * @param height the new {@code height} of this
2269      *          component
2270      * @see #getBounds
2271      * @see #setLocation(int, int)
2272      * @see #setLocation(Point)
2273      * @see #setSize(int, int)
2274      * @see #setSize(Dimension)
2275      * @see #invalidate
2276      * @since 1.1
2277      */
2278     public void setBounds(int x, int y, int width, int height) {
2279         reshape(x, y, width, height);
2280     }
2281 
2282     /**
2283      * Reshapes the bounding rectangle for this component.
2284      *
2285      * @param  x the <i>x</i> coordinate of the upper left corner of the rectangle
2286      * @param  y the <i>y</i> coordinate of the upper left corner of the rectangle
2287      * @param  width the width of the rectangle
2288      * @param  height the height of the rectangle
2289      *
2290      * @deprecated As of JDK version 1.1,
2291      * replaced by {@code setBounds(int, int, int, int)}.
2292      */
2293     @Deprecated
2294     public void reshape(int x, int y, int width, int height) {
2295         synchronized (getTreeLock()) {
2296             try {
2297                 setBoundsOp(ComponentPeer.SET_BOUNDS);
2298                 boolean resized = (this.width != width) || (this.height != height);
2299                 boolean moved = (this.x != x) || (this.y != y);
2300                 if (!resized && !moved) {
2301                     return;
2302                 }
2303                 int oldX = this.x;
2304                 int oldY = this.y;
2305                 int oldWidth = this.width;
2306                 int oldHeight = this.height;
2307                 this.x = x;
2308                 this.y = y;
2309                 this.width = width;
2310                 this.height = height;
2311 
2312                 if (resized) {
2313                     isPacked = false;
2314                 }
2315 
2316                 boolean needNotify = true;
2317                 mixOnReshaping();
2318                 if (peer != null) {
2319                     // LightweightPeer is an empty stub so can skip peer.reshape
2320                     if (!(peer instanceof LightweightPeer)) {
2321                         reshapeNativePeer(x, y, width, height, getBoundsOp());
2322                         // Check peer actually changed coordinates
2323                         resized = (oldWidth != this.width) || (oldHeight != this.height);
2324                         moved = (oldX != this.x) || (oldY != this.y);
2325                         // fix for 5025858: do not send ComponentEvents for toplevel
2326                         // windows here as it is done from peer or native code when
2327                         // the window is really resized or moved, otherwise some
2328                         // events may be sent twice
2329                         if (this instanceof Window) {
2330                             needNotify = false;
2331                         }
2332                     }
2333                     if (resized) {
2334                         invalidate();
2335                     }
2336                     if (parent != null) {
2337                         parent.invalidateIfValid();
2338                     }
2339                 }
2340                 if (needNotify) {
2341                     notifyNewBounds(resized, moved);
2342                 }
2343                 repaintParentIfNeeded(oldX, oldY, oldWidth, oldHeight);
2344             } finally {
2345                 setBoundsOp(ComponentPeer.RESET_OPERATION);
2346             }
2347         }
2348     }
2349 
2350     private void repaintParentIfNeeded(int oldX, int oldY, int oldWidth,
2351                                        int oldHeight)
2352     {
2353         if (parent != null && peer instanceof LightweightPeer && isShowing()) {
2354             // Have the parent redraw the area this component occupied.
2355             parent.repaint(oldX, oldY, oldWidth, oldHeight);
2356             // Have the parent redraw the area this component *now* occupies.
2357             repaint();
2358         }
2359     }
2360 
2361     private void reshapeNativePeer(int x, int y, int width, int height, int op) {
2362         // native peer might be offset by more than direct
2363         // parent since parent might be lightweight.
2364         int nativeX = x;
2365         int nativeY = y;
2366         for (Component c = parent;
2367              (c != null) && (c.peer instanceof LightweightPeer);
2368              c = c.parent)
2369         {
2370             nativeX += c.x;
2371             nativeY += c.y;
2372         }
2373         peer.setBounds(nativeX, nativeY, width, height, op);
2374     }
2375 
2376     @SuppressWarnings("deprecation")
2377     private void notifyNewBounds(boolean resized, boolean moved) {
2378         if (componentListener != null
2379             || (eventMask & AWTEvent.COMPONENT_EVENT_MASK) != 0
2380             || Toolkit.enabledOnToolkit(AWTEvent.COMPONENT_EVENT_MASK))
2381             {
2382                 if (resized) {
2383                     ComponentEvent e = new ComponentEvent(this,
2384                                                           ComponentEvent.COMPONENT_RESIZED);
2385                     Toolkit.getEventQueue().postEvent(e);
2386                 }
2387                 if (moved) {
2388                     ComponentEvent e = new ComponentEvent(this,
2389                                                           ComponentEvent.COMPONENT_MOVED);
2390                     Toolkit.getEventQueue().postEvent(e);
2391                 }
2392             } else {
2393                 if (this instanceof Container && ((Container)this).countComponents() > 0) {
2394                     boolean enabledOnToolkit =
2395                         Toolkit.enabledOnToolkit(AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK);
2396                     if (resized) {
2397 
2398                         ((Container)this).createChildHierarchyEvents(
2399                                                                      HierarchyEvent.ANCESTOR_RESIZED, 0, enabledOnToolkit);
2400                     }
2401                     if (moved) {
2402                         ((Container)this).createChildHierarchyEvents(
2403                                                                      HierarchyEvent.ANCESTOR_MOVED, 0, enabledOnToolkit);
2404                     }
2405                 }
2406                 }
2407     }
2408 
2409     /**
2410      * Moves and resizes this component to conform to the new
2411      * bounding rectangle {@code r}. This component's new
2412      * position is specified by {@code r.x} and {@code r.y},
2413      * and its new size is specified by {@code r.width} and
2414      * {@code r.height}
2415      * <p>
2416      * This method changes layout-related information, and therefore,
2417      * invalidates the component hierarchy.
2418      *
2419      * @param r the new bounding rectangle for this component
2420      * @throws NullPointerException if {@code r} is {@code null}
2421      * @see       #getBounds
2422      * @see       #setLocation(int, int)
2423      * @see       #setLocation(Point)
2424      * @see       #setSize(int, int)
2425      * @see       #setSize(Dimension)
2426      * @see #invalidate
2427      * @since     1.1
2428      */
2429     public void setBounds(Rectangle r) {
2430         setBounds(r.x, r.y, r.width, r.height);
2431     }
2432 
2433 
2434     /**
2435      * Returns the current x coordinate of the components origin.
2436      * This method is preferable to writing
2437      * {@code component.getBounds().x},
2438      * or {@code component.getLocation().x} because it doesn't
2439      * cause any heap allocations.
2440      *
2441      * @return the current x coordinate of the components origin
2442      * @since 1.2
2443      */
2444     public int getX() {
2445         return x;
2446     }
2447 
2448 
2449     /**
2450      * Returns the current y coordinate of the components origin.
2451      * This method is preferable to writing
2452      * {@code component.getBounds().y},
2453      * or {@code component.getLocation().y} because it
2454      * doesn't cause any heap allocations.
2455      *
2456      * @return the current y coordinate of the components origin
2457      * @since 1.2
2458      */
2459     public int getY() {
2460         return y;
2461     }
2462 
2463 
2464     /**
2465      * Returns the current width of this component.
2466      * This method is preferable to writing
2467      * {@code component.getBounds().width},
2468      * or {@code component.getSize().width} because it
2469      * doesn't cause any heap allocations.
2470      *
2471      * @return the current width of this component
2472      * @since 1.2
2473      */
2474     public int getWidth() {
2475         return width;
2476     }
2477 
2478 
2479     /**
2480      * Returns the current height of this component.
2481      * This method is preferable to writing
2482      * {@code component.getBounds().height},
2483      * or {@code component.getSize().height} because it
2484      * doesn't cause any heap allocations.
2485      *
2486      * @return the current height of this component
2487      * @since 1.2
2488      */
2489     public int getHeight() {
2490         return height;
2491     }
2492 
2493     /**
2494      * Stores the bounds of this component into "return value" <b>rv</b> and
2495      * return <b>rv</b>.  If rv is {@code null} a new
2496      * {@code Rectangle} is allocated.
2497      * This version of {@code getBounds} is useful if the caller
2498      * wants to avoid allocating a new {@code Rectangle} object
2499      * on the heap.
2500      *
2501      * @param rv the return value, modified to the components bounds
2502      * @return rv
2503      */
2504     public Rectangle getBounds(Rectangle rv) {
2505         if (rv == null) {
2506             return new Rectangle(getX(), getY(), getWidth(), getHeight());
2507         }
2508         else {
2509             rv.setBounds(getX(), getY(), getWidth(), getHeight());
2510             return rv;
2511         }
2512     }
2513 
2514     /**
2515      * Stores the width/height of this component into "return value" <b>rv</b>
2516      * and return <b>rv</b>.   If rv is {@code null} a new
2517      * {@code Dimension} object is allocated.  This version of
2518      * {@code getSize} is useful if the caller wants to avoid
2519      * allocating a new {@code Dimension} object on the heap.
2520      *
2521      * @param rv the return value, modified to the components size
2522      * @return rv
2523      */
2524     public Dimension getSize(Dimension rv) {
2525         if (rv == null) {
2526             return new Dimension(getWidth(), getHeight());
2527         }
2528         else {
2529             rv.setSize(getWidth(), getHeight());
2530             return rv;
2531         }
2532     }
2533 
2534     /**
2535      * Stores the x,y origin of this component into "return value" <b>rv</b>
2536      * and return <b>rv</b>.   If rv is {@code null} a new
2537      * {@code Point} is allocated.
2538      * This version of {@code getLocation} is useful if the
2539      * caller wants to avoid allocating a new {@code Point}
2540      * object on the heap.
2541      *
2542      * @param rv the return value, modified to the components location
2543      * @return rv
2544      */
2545     public Point getLocation(Point rv) {
2546         if (rv == null) {
2547             return new Point(getX(), getY());
2548         }
2549         else {
2550             rv.setLocation(getX(), getY());
2551             return rv;
2552         }
2553     }
2554 
2555     /**
2556      * Returns true if this component is completely opaque, returns
2557      * false by default.
2558      * <p>
2559      * An opaque component paints every pixel within its
2560      * rectangular region. A non-opaque component paints only some of
2561      * its pixels, allowing the pixels underneath it to "show through".
2562      * A component that does not fully paint its pixels therefore
2563      * provides a degree of transparency.
2564      * <p>
2565      * Subclasses that guarantee to always completely paint their
2566      * contents should override this method and return true.
2567      *
2568      * @return true if this component is completely opaque
2569      * @see #isLightweight
2570      * @since 1.2
2571      */
2572     public boolean isOpaque() {
2573         if (peer == null) {
2574             return false;
2575         }
2576         else {
2577             return !isLightweight();
2578         }
2579     }
2580 
2581 
2582     /**
2583      * A lightweight component doesn't have a native toolkit peer.
2584      * Subclasses of {@code Component} and {@code Container},
2585      * other than the ones defined in this package like {@code Button}
2586      * or {@code Scrollbar}, are lightweight.
2587      * All of the Swing components are lightweights.
2588      * <p>
2589      * This method will always return {@code false} if this component
2590      * is not displayable because it is impossible to determine the
2591      * weight of an undisplayable component.
2592      *
2593      * @return true if this component has a lightweight peer; false if
2594      *         it has a native peer or no peer
2595      * @see #isDisplayable
2596      * @since 1.2
2597      */
2598     public boolean isLightweight() {
2599         return peer instanceof LightweightPeer;
2600     }
2601 
2602 
2603     /**
2604      * Sets the preferred size of this component to a constant
2605      * value.  Subsequent calls to {@code getPreferredSize} will always
2606      * return this value.  Setting the preferred size to {@code null}
2607      * restores the default behavior.
2608      *
2609      * @param preferredSize The new preferred size, or null
2610      * @see #getPreferredSize
2611      * @see #isPreferredSizeSet
2612      * @since 1.5
2613      */
2614     public void setPreferredSize(Dimension preferredSize) {
2615         Dimension old;
2616         // If the preferred size was set, use it as the old value, otherwise
2617         // use null to indicate we didn't previously have a set preferred
2618         // size.
2619         if (prefSizeSet) {
2620             old = this.prefSize;
2621         }
2622         else {
2623             old = null;
2624         }
2625         this.prefSize = preferredSize;
2626         prefSizeSet = (preferredSize != null);
2627         firePropertyChange("preferredSize", old, preferredSize);
2628     }
2629 
2630 
2631     /**
2632      * Returns true if the preferred size has been set to a
2633      * non-{@code null} value otherwise returns false.
2634      *
2635      * @return true if {@code setPreferredSize} has been invoked
2636      *         with a non-null value.
2637      * @since 1.5
2638      */
2639     public boolean isPreferredSizeSet() {
2640         return prefSizeSet;
2641     }
2642 
2643 
2644     /**
2645      * Gets the preferred size of this component.
2646      * @return a dimension object indicating this component's preferred size
2647      * @see #getMinimumSize
2648      * @see LayoutManager
2649      */
2650     public Dimension getPreferredSize() {
2651         return preferredSize();
2652     }
2653 
2654 
2655     /**
2656      * Returns the component's preferred size.
2657      *
2658      * @return the component's preferred size
2659      * @deprecated As of JDK version 1.1,
2660      * replaced by {@code getPreferredSize()}.
2661      */
2662     @Deprecated
2663     public Dimension preferredSize() {
2664         /* Avoid grabbing the lock if a reasonable cached size value
2665          * is available.
2666          */
2667         Dimension dim = prefSize;
2668         if (dim == null || !(isPreferredSizeSet() || isValid())) {
2669             synchronized (getTreeLock()) {
2670                 prefSize = (peer != null) ?
2671                     peer.getPreferredSize() :
2672                     getMinimumSize();
2673                 dim = prefSize;
2674             }
2675         }
2676         return new Dimension(dim);
2677     }
2678 
2679     /**
2680      * Sets the minimum size of this component to a constant
2681      * value.  Subsequent calls to {@code getMinimumSize} will always
2682      * return this value.  Setting the minimum size to {@code null}
2683      * restores the default behavior.
2684      *
2685      * @param minimumSize the new minimum size of this component
2686      * @see #getMinimumSize
2687      * @see #isMinimumSizeSet
2688      * @since 1.5
2689      */
2690     public void setMinimumSize(Dimension minimumSize) {
2691         Dimension old;
2692         // If the minimum size was set, use it as the old value, otherwise
2693         // use null to indicate we didn't previously have a set minimum
2694         // size.
2695         if (minSizeSet) {
2696             old = this.minSize;
2697         }
2698         else {
2699             old = null;
2700         }
2701         this.minSize = minimumSize;
2702         minSizeSet = (minimumSize != null);
2703         firePropertyChange("minimumSize", old, minimumSize);
2704     }
2705 
2706     /**
2707      * Returns whether or not {@code setMinimumSize} has been
2708      * invoked with a non-null value.
2709      *
2710      * @return true if {@code setMinimumSize} has been invoked with a
2711      *              non-null value.
2712      * @since 1.5
2713      */
2714     public boolean isMinimumSizeSet() {
2715         return minSizeSet;
2716     }
2717 
2718     /**
2719      * Gets the minimum size of this component.
2720      * @return a dimension object indicating this component's minimum size
2721      * @see #getPreferredSize
2722      * @see LayoutManager
2723      */
2724     public Dimension getMinimumSize() {
2725         return minimumSize();
2726     }
2727 
2728     /**
2729      * Returns the minimum size of this component.
2730      *
2731      * @return the minimum size of this component
2732      * @deprecated As of JDK version 1.1,
2733      * replaced by {@code getMinimumSize()}.
2734      */
2735     @Deprecated
2736     public Dimension minimumSize() {
2737         /* Avoid grabbing the lock if a reasonable cached size value
2738          * is available.
2739          */
2740         Dimension dim = minSize;
2741         if (dim == null || !(isMinimumSizeSet() || isValid())) {
2742             synchronized (getTreeLock()) {
2743                 minSize = (peer != null) ?
2744                     peer.getMinimumSize() :
2745                     size();
2746                 dim = minSize;
2747             }
2748         }
2749         return new Dimension(dim);
2750     }
2751 
2752     /**
2753      * Sets the maximum size of this component to a constant
2754      * value.  Subsequent calls to {@code getMaximumSize} will always
2755      * return this value.  Setting the maximum size to {@code null}
2756      * restores the default behavior.
2757      *
2758      * @param maximumSize a {@code Dimension} containing the
2759      *          desired maximum allowable size
2760      * @see #getMaximumSize
2761      * @see #isMaximumSizeSet
2762      * @since 1.5
2763      */
2764     public void setMaximumSize(Dimension maximumSize) {
2765         // If the maximum size was set, use it as the old value, otherwise
2766         // use null to indicate we didn't previously have a set maximum
2767         // size.
2768         Dimension old;
2769         if (maxSizeSet) {
2770             old = this.maxSize;
2771         }
2772         else {
2773             old = null;
2774         }
2775         this.maxSize = maximumSize;
2776         maxSizeSet = (maximumSize != null);
2777         firePropertyChange("maximumSize", old, maximumSize);
2778     }
2779 
2780     /**
2781      * Returns true if the maximum size has been set to a non-{@code null}
2782      * value otherwise returns false.
2783      *
2784      * @return true if {@code maximumSize} is non-{@code null},
2785      *          false otherwise
2786      * @since 1.5
2787      */
2788     public boolean isMaximumSizeSet() {
2789         return maxSizeSet;
2790     }
2791 
2792     /**
2793      * Gets the maximum size of this component.
2794      * @return a dimension object indicating this component's maximum size
2795      * @see #getMinimumSize
2796      * @see #getPreferredSize
2797      * @see LayoutManager
2798      */
2799     public Dimension getMaximumSize() {
2800         if (isMaximumSizeSet()) {
2801             return new Dimension(maxSize);
2802         }
2803         return new Dimension(Short.MAX_VALUE, Short.MAX_VALUE);
2804     }
2805 
2806     /**
2807      * Returns the alignment along the x axis.  This specifies how
2808      * the component would like to be aligned relative to other
2809      * components.  The value should be a number between 0 and 1
2810      * where 0 represents alignment along the origin, 1 is aligned
2811      * the furthest away from the origin, 0.5 is centered, etc.
2812      *
2813      * @return the horizontal alignment of this component
2814      */
2815     public float getAlignmentX() {
2816         return CENTER_ALIGNMENT;
2817     }
2818 
2819     /**
2820      * Returns the alignment along the y axis.  This specifies how
2821      * the component would like to be aligned relative to other
2822      * components.  The value should be a number between 0 and 1
2823      * where 0 represents alignment along the origin, 1 is aligned
2824      * the furthest away from the origin, 0.5 is centered, etc.
2825      *
2826      * @return the vertical alignment of this component
2827      */
2828     public float getAlignmentY() {
2829         return CENTER_ALIGNMENT;
2830     }
2831 
2832     /**
2833      * Returns the baseline.  The baseline is measured from the top of
2834      * the component.  This method is primarily meant for
2835      * {@code LayoutManager}s to align components along their
2836      * baseline.  A return value less than 0 indicates this component
2837      * does not have a reasonable baseline and that
2838      * {@code LayoutManager}s should not align this component on
2839      * its baseline.
2840      * <p>
2841      * The default implementation returns -1.  Subclasses that support
2842      * baseline should override appropriately.  If a value &gt;= 0 is
2843      * returned, then the component has a valid baseline for any
2844      * size &gt;= the minimum size and {@code getBaselineResizeBehavior}
2845      * can be used to determine how the baseline changes with size.
2846      *
2847      * @param width the width to get the baseline for
2848      * @param height the height to get the baseline for
2849      * @return the baseline or &lt; 0 indicating there is no reasonable
2850      *         baseline
2851      * @throws IllegalArgumentException if width or height is &lt; 0
2852      * @see #getBaselineResizeBehavior
2853      * @see java.awt.FontMetrics
2854      * @since 1.6
2855      */
2856     public int getBaseline(int width, int height) {
2857         if (width < 0 || height < 0) {
2858             throw new IllegalArgumentException(
2859                     "Width and height must be >= 0");
2860         }
2861         return -1;
2862     }
2863 
2864     /**
2865      * Returns an enum indicating how the baseline of the component
2866      * changes as the size changes.  This method is primarily meant for
2867      * layout managers and GUI builders.
2868      * <p>
2869      * The default implementation returns
2870      * {@code BaselineResizeBehavior.OTHER}.  Subclasses that have a
2871      * baseline should override appropriately.  Subclasses should
2872      * never return {@code null}; if the baseline can not be
2873      * calculated return {@code BaselineResizeBehavior.OTHER}.  Callers
2874      * should first ask for the baseline using
2875      * {@code getBaseline} and if a value &gt;= 0 is returned use
2876      * this method.  It is acceptable for this method to return a
2877      * value other than {@code BaselineResizeBehavior.OTHER} even if
2878      * {@code getBaseline} returns a value less than 0.
2879      *
2880      * @return an enum indicating how the baseline changes as the component
2881      *         size changes
2882      * @see #getBaseline(int, int)
2883      * @since 1.6
2884      */
2885     public BaselineResizeBehavior getBaselineResizeBehavior() {
2886         return BaselineResizeBehavior.OTHER;
2887     }
2888 
2889     /**
2890      * Prompts the layout manager to lay out this component. This is
2891      * usually called when the component (more specifically, container)
2892      * is validated.
2893      * @see #validate
2894      * @see LayoutManager
2895      */
2896     public void doLayout() {
2897         layout();
2898     }
2899 
2900     /**
2901      * @deprecated As of JDK version 1.1,
2902      * replaced by {@code doLayout()}.
2903      */
2904     @Deprecated
2905     public void layout() {
2906     }
2907 
2908     /**
2909      * Validates this component.
2910      * <p>
2911      * The meaning of the term <i>validating</i> is defined by the ancestors of
2912      * this class. See {@link Container#validate} for more details.
2913      *
2914      * @see       #invalidate
2915      * @see       #doLayout()
2916      * @see       LayoutManager
2917      * @see       Container#validate
2918      * @since     1.0
2919      */
2920     public void validate() {
2921         synchronized (getTreeLock()) {
2922             ComponentPeer peer = this.peer;
2923             boolean wasValid = isValid();
2924             if (!wasValid && peer != null) {
2925                 Font newfont = getFont();
2926                 Font oldfont = peerFont;
2927                 if (newfont != oldfont && (oldfont == null
2928                                            || !oldfont.equals(newfont))) {
2929                     peer.setFont(newfont);
2930                     peerFont = newfont;
2931                 }
2932                 peer.layout();
2933             }
2934             valid = true;
2935             if (!wasValid) {
2936                 mixOnValidating();
2937             }
2938         }
2939     }
2940 
2941     /**
2942      * Invalidates this component and its ancestors.
2943      * <p>
2944      * By default, all the ancestors of the component up to the top-most
2945      * container of the hierarchy are marked invalid. If the {@code
2946      * java.awt.smartInvalidate} system property is set to {@code true},
2947      * invalidation stops on the nearest validate root of this component.
2948      * Marking a container <i>invalid</i> indicates that the container needs to
2949      * be laid out.
2950      * <p>
2951      * This method is called automatically when any layout-related information
2952      * changes (e.g. setting the bounds of the component, or adding the
2953      * component to a container).
2954      * <p>
2955      * This method might be called often, so it should work fast.
2956      *
2957      * @see       #validate
2958      * @see       #doLayout
2959      * @see       LayoutManager
2960      * @see       java.awt.Container#isValidateRoot
2961      * @since     1.0
2962      */
2963     public void invalidate() {
2964         synchronized (getTreeLock()) {
2965             /* Nullify cached layout and size information.
2966              * For efficiency, propagate invalidate() upwards only if
2967              * some other component hasn't already done so first.
2968              */
2969             valid = false;
2970             if (!isPreferredSizeSet()) {
2971                 prefSize = null;
2972             }
2973             if (!isMinimumSizeSet()) {
2974                 minSize = null;
2975             }
2976             if (!isMaximumSizeSet()) {
2977                 maxSize = null;
2978             }
2979             invalidateParent();
2980         }
2981     }
2982 
2983     /**
2984      * Invalidates the parent of this component if any.
2985      *
2986      * This method MUST BE invoked under the TreeLock.
2987      */
2988     void invalidateParent() {
2989         if (parent != null) {
2990             parent.invalidateIfValid();
2991         }
2992     }
2993 
2994     /** Invalidates the component unless it is already invalid.
2995      */
2996     final void invalidateIfValid() {
2997         if (isValid()) {
2998             invalidate();
2999         }
3000     }
3001 
3002     /**
3003      * Revalidates the component hierarchy up to the nearest validate root.
3004      * <p>
3005      * This method first invalidates the component hierarchy starting from this
3006      * component up to the nearest validate root. Afterwards, the component
3007      * hierarchy is validated starting from the nearest validate root.
3008      * <p>
3009      * This is a convenience method supposed to help application developers
3010      * avoid looking for validate roots manually. Basically, it's equivalent to
3011      * first calling the {@link #invalidate()} method on this component, and
3012      * then calling the {@link #validate()} method on the nearest validate
3013      * root.
3014      *
3015      * @see Container#isValidateRoot
3016      * @since 1.7
3017      */
3018     public void revalidate() {
3019         revalidateSynchronously();
3020     }
3021 
3022     /**
3023      * Revalidates the component synchronously.
3024      */
3025     final void revalidateSynchronously() {
3026         synchronized (getTreeLock()) {
3027             invalidate();
3028 
3029             Container root = getContainer();
3030             if (root == null) {
3031                 // There's no parents. Just validate itself.
3032                 validate();
3033             } else {
3034                 while (!root.isValidateRoot()) {
3035                     if (root.getContainer() == null) {
3036                         // If there's no validate roots, we'll validate the
3037                         // topmost container
3038                         break;
3039                     }
3040 
3041                     root = root.getContainer();
3042                 }
3043 
3044                 root.validate();
3045             }
3046         }
3047     }
3048 
3049     /**
3050      * Creates a graphics context for this component. This method will
3051      * return {@code null} if this component is currently not
3052      * displayable.
3053      * @return a graphics context for this component, or {@code null}
3054      *             if it has none
3055      * @see       #paint
3056      * @since     1.0
3057      */
3058     public Graphics getGraphics() {
3059         if (peer instanceof LightweightPeer) {
3060             // This is for a lightweight component, need to
3061             // translate coordinate spaces and clip relative
3062             // to the parent.
3063             if (parent == null) return null;
3064             Graphics g = parent.getGraphics();
3065             if (g == null) return null;
3066             if (g instanceof ConstrainableGraphics) {
3067                 ((ConstrainableGraphics) g).constrain(x, y, width, height);
3068             } else {
3069                 g.translate(x,y);
3070                 g.setClip(0, 0, width, height);
3071             }
3072             g.setFont(getFont());
3073             return g;
3074         } else {
3075             ComponentPeer peer = this.peer;
3076             return (peer != null) ? peer.getGraphics() : null;
3077         }
3078     }
3079 
3080     final Graphics getGraphics_NoClientCode() {
3081         ComponentPeer peer = this.peer;
3082         if (peer instanceof LightweightPeer) {
3083             // This is for a lightweight component, need to
3084             // translate coordinate spaces and clip relative
3085             // to the parent.
3086             Container parent = this.parent;
3087             if (parent == null) return null;
3088             Graphics g = parent.getGraphics_NoClientCode();
3089             if (g == null) return null;
3090             if (g instanceof ConstrainableGraphics) {
3091                 ((ConstrainableGraphics) g).constrain(x, y, width, height);
3092             } else {
3093                 g.translate(x,y);
3094                 g.setClip(0, 0, width, height);
3095             }
3096             g.setFont(getFont_NoClientCode());
3097             return g;
3098         } else {
3099             return (peer != null) ? peer.getGraphics() : null;
3100         }
3101     }
3102 
3103     /**
3104      * Gets the font metrics for the specified font.
3105      * Warning: Since Font metrics are affected by the
3106      * {@link java.awt.font.FontRenderContext FontRenderContext} and
3107      * this method does not provide one, it can return only metrics for
3108      * the default render context which may not match that used when
3109      * rendering on the Component if {@link Graphics2D} functionality is being
3110      * used. Instead metrics can be obtained at rendering time by calling
3111      * {@link Graphics#getFontMetrics()} or text measurement APIs on the
3112      * {@link Font Font} class.
3113      * @param font the font for which font metrics is to be
3114      *          obtained
3115      * @return the font metrics for {@code font}
3116      * @see       #getFont
3117      * @see       java.awt.peer.ComponentPeer#getFontMetrics(Font)
3118      * @see       Toolkit#getFontMetrics(Font)
3119      * @since     1.0
3120      */
3121     public FontMetrics getFontMetrics(Font font) {
3122         // This is an unsupported hack, but left in for a customer.
3123         // Do not remove.
3124         FontManager fm = FontManagerFactory.getInstance();
3125         if (fm instanceof SunFontManager
3126             && ((SunFontManager) fm).usePlatformFontMetrics()) {
3127 
3128             if (peer != null &&
3129                 !(peer instanceof LightweightPeer)) {
3130                 return peer.getFontMetrics(font);
3131             }
3132         }
3133         return sun.font.FontDesignMetrics.getMetrics(font);
3134     }
3135 
3136     /**
3137      * Sets the cursor image to the specified cursor.  This cursor
3138      * image is displayed when the {@code contains} method for
3139      * this component returns true for the current cursor location, and
3140      * this Component is visible, displayable, and enabled. Setting the
3141      * cursor of a {@code Container} causes that cursor to be displayed
3142      * within all of the container's subcomponents, except for those
3143      * that have a non-{@code null} cursor.
3144      * <p>
3145      * The method may have no visual effect if the Java platform
3146      * implementation and/or the native system do not support
3147      * changing the mouse cursor shape.
3148      * @param cursor One of the constants defined
3149      *          by the {@code Cursor} class;
3150      *          if this parameter is {@code null}
3151      *          then this component will inherit
3152      *          the cursor of its parent
3153      * @see       #isEnabled
3154      * @see       #isShowing
3155      * @see       #getCursor
3156      * @see       #contains
3157      * @see       Toolkit#createCustomCursor
3158      * @see       Cursor
3159      * @since     1.1
3160      */
3161     public void setCursor(Cursor cursor) {
3162         this.cursor = cursor;
3163         updateCursorImmediately();
3164     }
3165 
3166     /**
3167      * Updates the cursor.  May not be invoked from the native
3168      * message pump.
3169      */
3170     final void updateCursorImmediately() {
3171         if (peer instanceof LightweightPeer) {
3172             Container nativeContainer = getNativeContainer();
3173 
3174             if (nativeContainer == null) return;
3175 
3176             ComponentPeer cPeer = nativeContainer.peer;
3177 
3178             if (cPeer != null) {
3179                 cPeer.updateCursorImmediately();
3180             }
3181         } else if (peer != null) {
3182             peer.updateCursorImmediately();
3183         }
3184     }
3185 
3186     /**
3187      * Gets the cursor set in the component. If the component does
3188      * not have a cursor set, the cursor of its parent is returned.
3189      * If no cursor is set in the entire hierarchy,
3190      * {@code Cursor.DEFAULT_CURSOR} is returned.
3191      *
3192      * @return the cursor for this component
3193      * @see #setCursor
3194      * @since 1.1
3195      */
3196     public Cursor getCursor() {
3197         return getCursor_NoClientCode();
3198     }
3199 
3200     final Cursor getCursor_NoClientCode() {
3201         Cursor cursor = this.cursor;
3202         if (cursor != null) {
3203             return cursor;
3204         }
3205         Container parent = this.parent;
3206         if (parent != null) {
3207             return parent.getCursor_NoClientCode();
3208         } else {
3209             return Cursor.getPredefinedCursor(Cursor.DEFAULT_CURSOR);
3210         }
3211     }
3212 
3213     /**
3214      * Returns whether the cursor has been explicitly set for this Component.
3215      * If this method returns {@code false}, this Component is inheriting
3216      * its cursor from an ancestor.
3217      *
3218      * @return {@code true} if the cursor has been explicitly set for this
3219      *         Component; {@code false} otherwise.
3220      * @since 1.4
3221      */
3222     public boolean isCursorSet() {
3223         return (cursor != null);
3224     }
3225 
3226     /**
3227      * Paints this component.
3228      * <p>
3229      * This method is called when the contents of the component should
3230      * be painted; such as when the component is first being shown or
3231      * is damaged and in need of repair.  The clip rectangle in the
3232      * {@code Graphics} parameter is set to the area
3233      * which needs to be painted.
3234      * Subclasses of {@code Component} that override this
3235      * method need not call {@code super.paint(g)}.
3236      * <p>
3237      * For performance reasons, {@code Component}s with zero width
3238      * or height aren't considered to need painting when they are first shown,
3239      * and also aren't considered to need repair.
3240      * <p>
3241      * <b>Note</b>: For more information on the paint mechanisms utilitized
3242      * by AWT and Swing, including information on how to write the most
3243      * efficient painting code, see
3244      * <a href="http://www.oracle.com/technetwork/java/painting-140037.html">Painting in AWT and Swing</a>.
3245      *
3246      * @param g the graphics context to use for painting
3247      * @see       #update
3248      * @since     1.0
3249      */
3250     public void paint(Graphics g) {
3251     }
3252 
3253     /**
3254      * Updates this component.
3255      * <p>
3256      * If this component is not a lightweight component, the
3257      * AWT calls the {@code update} method in response to
3258      * a call to {@code repaint}.  You can assume that
3259      * the background is not cleared.
3260      * <p>
3261      * The {@code update} method of {@code Component}
3262      * calls this component's {@code paint} method to redraw
3263      * this component.  This method is commonly overridden by subclasses
3264      * which need to do additional work in response to a call to
3265      * {@code repaint}.
3266      * Subclasses of Component that override this method should either
3267      * call {@code super.update(g)}, or call {@code paint(g)}
3268      * directly from their {@code update} method.
3269      * <p>
3270      * The origin of the graphics context, its
3271      * ({@code 0},&nbsp;{@code 0}) coordinate point, is the
3272      * top-left corner of this component. The clipping region of the
3273      * graphics context is the bounding rectangle of this component.
3274      *
3275      * <p>
3276      * <b>Note</b>: For more information on the paint mechanisms utilitized
3277      * by AWT and Swing, including information on how to write the most
3278      * efficient painting code, see
3279      * <a href="http://www.oracle.com/technetwork/java/painting-140037.html">Painting in AWT and Swing</a>.
3280      *
3281      * @param g the specified context to use for updating
3282      * @see       #paint
3283      * @see       #repaint()
3284      * @since     1.0
3285      */
3286     public void update(Graphics g) {
3287         paint(g);
3288     }
3289 
3290     /**
3291      * Paints this component and all of its subcomponents.
3292      * <p>
3293      * The origin of the graphics context, its
3294      * ({@code 0},&nbsp;{@code 0}) coordinate point, is the
3295      * top-left corner of this component. The clipping region of the
3296      * graphics context is the bounding rectangle of this component.
3297      *
3298      * @param     g   the graphics context to use for painting
3299      * @see       #paint
3300      * @since     1.0
3301      */
3302     public void paintAll(Graphics g) {
3303         if (isShowing()) {
3304             GraphicsCallback.PeerPaintCallback.getInstance().
3305                 runOneComponent(this, new Rectangle(0, 0, width, height),
3306                                 g, g.getClip(),
3307                                 GraphicsCallback.LIGHTWEIGHTS |
3308                                 GraphicsCallback.HEAVYWEIGHTS);
3309         }
3310     }
3311 
3312     /**
3313      * Simulates the peer callbacks into java.awt for painting of
3314      * lightweight Components.
3315      * @param     g   the graphics context to use for painting
3316      * @see       #paintAll
3317      */
3318     void lightweightPaint(Graphics g) {
3319         paint(g);
3320     }
3321 
3322     /**
3323      * Paints all the heavyweight subcomponents.
3324      */
3325     void paintHeavyweightComponents(Graphics g) {
3326     }
3327 
3328     /**
3329      * Repaints this component.
3330      * <p>
3331      * If this component is a lightweight component, this method
3332      * causes a call to this component's {@code paint}
3333      * method as soon as possible.  Otherwise, this method causes
3334      * a call to this component's {@code update} method as soon
3335      * as possible.
3336      * <p>
3337      * <b>Note</b>: For more information on the paint mechanisms utilitized
3338      * by AWT and Swing, including information on how to write the most
3339      * efficient painting code, see
3340      * <a href="http://www.oracle.com/technetwork/java/painting-140037.html">Painting in AWT and Swing</a>.
3341 
3342      *
3343      * @see       #update(Graphics)
3344      * @since     1.0
3345      */
3346     public void repaint() {
3347         repaint(0, 0, 0, width, height);
3348     }
3349 
3350     /**
3351      * Repaints the component.  If this component is a lightweight
3352      * component, this results in a call to {@code paint}
3353      * within {@code tm} milliseconds.
3354      * <p>
3355      * <b>Note</b>: For more information on the paint mechanisms utilitized
3356      * by AWT and Swing, including information on how to write the most
3357      * efficient painting code, see
3358      * <a href="http://www.oracle.com/technetwork/java/painting-140037.html">Painting in AWT and Swing</a>.
3359      *
3360      * @param tm maximum time in milliseconds before update
3361      * @see #paint
3362      * @see #update(Graphics)
3363      * @since 1.0
3364      */
3365     public void repaint(long tm) {
3366         repaint(tm, 0, 0, width, height);
3367     }
3368 
3369     /**
3370      * Repaints the specified rectangle of this component.
3371      * <p>
3372      * If this component is a lightweight component, this method
3373      * causes a call to this component's {@code paint} method
3374      * as soon as possible.  Otherwise, this method causes a call to
3375      * this component's {@code update} method as soon as possible.
3376      * <p>
3377      * <b>Note</b>: For more information on the paint mechanisms utilitized
3378      * by AWT and Swing, including information on how to write the most
3379      * efficient painting code, see
3380      * <a href="http://www.oracle.com/technetwork/java/painting-140037.html">Painting in AWT and Swing</a>.
3381      *
3382      * @param     x   the <i>x</i> coordinate
3383      * @param     y   the <i>y</i> coordinate
3384      * @param     width   the width
3385      * @param     height  the height
3386      * @see       #update(Graphics)
3387      * @since     1.0
3388      */
3389     public void repaint(int x, int y, int width, int height) {
3390         repaint(0, x, y, width, height);
3391     }
3392 
3393     /**
3394      * Repaints the specified rectangle of this component within
3395      * {@code tm} milliseconds.
3396      * <p>
3397      * If this component is a lightweight component, this method causes
3398      * a call to this component's {@code paint} method.
3399      * Otherwise, this method causes a call to this component's
3400      * {@code update} method.
3401      * <p>
3402      * <b>Note</b>: For more information on the paint mechanisms utilitized
3403      * by AWT and Swing, including information on how to write the most
3404      * efficient painting code, see
3405      * <a href="http://www.oracle.com/technetwork/java/painting-140037.html">Painting in AWT and Swing</a>.
3406      *
3407      * @param     tm   maximum time in milliseconds before update
3408      * @param     x    the <i>x</i> coordinate
3409      * @param     y    the <i>y</i> coordinate
3410      * @param     width    the width
3411      * @param     height   the height
3412      * @see       #update(Graphics)
3413      * @since     1.0
3414      */
3415     public void repaint(long tm, int x, int y, int width, int height) {
3416         if (this.peer instanceof LightweightPeer) {
3417             // Needs to be translated to parent coordinates since
3418             // a parent native container provides the actual repaint
3419             // services.  Additionally, the request is restricted to
3420             // the bounds of the component.
3421             if (parent != null) {
3422                 if (x < 0) {
3423                     width += x;
3424                     x = 0;
3425                 }
3426                 if (y < 0) {
3427                     height += y;
3428                     y = 0;
3429                 }
3430 
3431                 int pwidth = (width > this.width) ? this.width : width;
3432                 int pheight = (height > this.height) ? this.height : height;
3433 
3434                 if (pwidth <= 0 || pheight <= 0) {
3435                     return;
3436                 }
3437 
3438                 int px = this.x + x;
3439                 int py = this.y + y;
3440                 parent.repaint(tm, px, py, pwidth, pheight);
3441             }
3442         } else {
3443             if (isVisible() && (this.peer != null) &&
3444                 (width > 0) && (height > 0)) {
3445                 PaintEvent e = new PaintEvent(this, PaintEvent.UPDATE,
3446                                               new Rectangle(x, y, width, height));
3447                 SunToolkit.postEvent(SunToolkit.targetToAppContext(this), e);
3448             }
3449         }
3450     }
3451 
3452     /**
3453      * Prints this component. Applications should override this method
3454      * for components that must do special processing before being
3455      * printed or should be printed differently than they are painted.
3456      * <p>
3457      * The default implementation of this method calls the
3458      * {@code paint} method.
3459      * <p>
3460      * The origin of the graphics context, its
3461      * ({@code 0},&nbsp;{@code 0}) coordinate point, is the
3462      * top-left corner of this component. The clipping region of the
3463      * graphics context is the bounding rectangle of this component.
3464      * @param     g   the graphics context to use for printing
3465      * @see       #paint(Graphics)
3466      * @since     1.0
3467      */
3468     public void print(Graphics g) {
3469         paint(g);
3470     }
3471 
3472     /**
3473      * Prints this component and all of its subcomponents.
3474      * <p>
3475      * The origin of the graphics context, its
3476      * ({@code 0},&nbsp;{@code 0}) coordinate point, is the
3477      * top-left corner of this component. The clipping region of the
3478      * graphics context is the bounding rectangle of this component.
3479      * @param     g   the graphics context to use for printing
3480      * @see       #print(Graphics)
3481      * @since     1.0
3482      */
3483     public void printAll(Graphics g) {
3484         if (isShowing()) {
3485             GraphicsCallback.PeerPrintCallback.getInstance().
3486                 runOneComponent(this, new Rectangle(0, 0, width, height),
3487                                 g, g.getClip(),
3488                                 GraphicsCallback.LIGHTWEIGHTS |
3489                                 GraphicsCallback.HEAVYWEIGHTS);
3490         }
3491     }
3492 
3493     /**
3494      * Simulates the peer callbacks into java.awt for printing of
3495      * lightweight Components.
3496      * @param     g   the graphics context to use for printing
3497      * @see       #printAll
3498      */
3499     void lightweightPrint(Graphics g) {
3500         print(g);
3501     }
3502 
3503     /**
3504      * Prints all the heavyweight subcomponents.
3505      */
3506     void printHeavyweightComponents(Graphics g) {
3507     }
3508 
3509     private Insets getInsets_NoClientCode() {
3510         ComponentPeer peer = this.peer;
3511         if (peer instanceof ContainerPeer) {
3512             return (Insets)((ContainerPeer)peer).getInsets().clone();
3513         }
3514         return new Insets(0, 0, 0, 0);
3515     }
3516 
3517     /**
3518      * Repaints the component when the image has changed.
3519      * This {@code imageUpdate} method of an {@code ImageObserver}
3520      * is called when more information about an
3521      * image which had been previously requested using an asynchronous
3522      * routine such as the {@code drawImage} method of
3523      * {@code Graphics} becomes available.
3524      * See the definition of {@code imageUpdate} for
3525      * more information on this method and its arguments.
3526      * <p>
3527      * The {@code imageUpdate} method of {@code Component}
3528      * incrementally draws an image on the component as more of the bits
3529      * of the image are available.
3530      * <p>
3531      * If the system property {@code awt.image.incrementaldraw}
3532      * is missing or has the value {@code true}, the image is
3533      * incrementally drawn. If the system property has any other value,
3534      * then the image is not drawn until it has been completely loaded.
3535      * <p>
3536      * Also, if incremental drawing is in effect, the value of the
3537      * system property {@code awt.image.redrawrate} is interpreted
3538      * as an integer to give the maximum redraw rate, in milliseconds. If
3539      * the system property is missing or cannot be interpreted as an
3540      * integer, the redraw rate is once every 100ms.
3541      * <p>
3542      * The interpretation of the {@code x}, {@code y},
3543      * {@code width}, and {@code height} arguments depends on
3544      * the value of the {@code infoflags} argument.
3545      *
3546      * @param     img   the image being observed
3547      * @param     infoflags   see {@code imageUpdate} for more information
3548      * @param     x   the <i>x</i> coordinate
3549      * @param     y   the <i>y</i> coordinate
3550      * @param     w   the width
3551      * @param     h   the height
3552      * @return    {@code false} if the infoflags indicate that the
3553      *            image is completely loaded; {@code true} otherwise.
3554      *
3555      * @see     java.awt.image.ImageObserver
3556      * @see     Graphics#drawImage(Image, int, int, Color, java.awt.image.ImageObserver)
3557      * @see     Graphics#drawImage(Image, int, int, java.awt.image.ImageObserver)
3558      * @see     Graphics#drawImage(Image, int, int, int, int, Color, java.awt.image.ImageObserver)
3559      * @see     Graphics#drawImage(Image, int, int, int, int, java.awt.image.ImageObserver)
3560      * @see     java.awt.image.ImageObserver#imageUpdate(java.awt.Image, int, int, int, int, int)
3561      * @since   1.0
3562      */
3563     public boolean imageUpdate(Image img, int infoflags,
3564                                int x, int y, int w, int h) {
3565         int rate = -1;
3566         if ((infoflags & (FRAMEBITS|ALLBITS)) != 0) {
3567             rate = 0;
3568         } else if ((infoflags & SOMEBITS) != 0) {
3569             if (isInc) {
3570                 rate = incRate;
3571                 if (rate < 0) {
3572                     rate = 0;
3573                 }
3574             }
3575         }
3576         if (rate >= 0) {
3577             repaint(rate, 0, 0, width, height);
3578         }
3579         return (infoflags & (ALLBITS|ABORT)) == 0;
3580     }
3581 
3582     /**
3583      * Creates an image from the specified image producer.
3584      * @param     producer  the image producer
3585      * @return    the image produced
3586      * @since     1.0
3587      */
3588     public Image createImage(ImageProducer producer) {
3589         ComponentPeer peer = this.peer;
3590         if ((peer != null) && ! (peer instanceof LightweightPeer)) {
3591             return peer.createImage(producer);
3592         }
3593         return getToolkit().createImage(producer);
3594     }
3595 
3596     /**
3597      * Creates an off-screen drawable image to be used for double buffering.
3598      *
3599      * @param  width the specified width
3600      * @param  height the specified height
3601      * @return an off-screen drawable image, which can be used for double
3602      *         buffering. The {@code null} value if the component is not
3603      *         displayable or {@code GraphicsEnvironment.isHeadless()} returns
3604      *         {@code true}.
3605      * @see #isDisplayable
3606      * @see GraphicsEnvironment#isHeadless
3607      * @since 1.0
3608      */
3609     public Image createImage(int width, int height) {
3610         ComponentPeer peer = this.peer;
3611         if (peer instanceof LightweightPeer) {
3612             if (parent != null) { return parent.createImage(width, height); }
3613             else { return null;}
3614         } else {
3615             return (peer != null) ? peer.createImage(width, height) : null;
3616         }
3617     }
3618 
3619     /**
3620      * Creates a volatile off-screen drawable image to be used for double
3621      * buffering.
3622      *
3623      * @param  width the specified width
3624      * @param  height the specified height
3625      * @return an off-screen drawable image, which can be used for double
3626      *         buffering. The {@code null} value if the component is not
3627      *         displayable or {@code GraphicsEnvironment.isHeadless()} returns
3628      *         {@code true}.
3629      * @see java.awt.image.VolatileImage
3630      * @see #isDisplayable
3631      * @see GraphicsEnvironment#isHeadless
3632      * @since 1.4
3633      */
3634     public VolatileImage createVolatileImage(int width, int height) {
3635         ComponentPeer peer = this.peer;
3636         if (peer instanceof LightweightPeer) {
3637             if (parent != null) {
3638                 return parent.createVolatileImage(width, height);
3639             }
3640             else { return null;}
3641         } else {
3642             return (peer != null) ?
3643                 peer.createVolatileImage(width, height) : null;
3644         }
3645     }
3646 
3647     /**
3648      * Creates a volatile off-screen drawable image, with the given
3649      * capabilities. The contents of this image may be lost at any time due to
3650      * operating system issues, so the image must be managed via the
3651      * {@code VolatileImage} interface.
3652      *
3653      * @param  width the specified width
3654      * @param  height the specified height
3655      * @param  caps the image capabilities
3656      * @return a VolatileImage object, which can be used to manage surface
3657      *         contents loss and capabilities. The {@code null} value if the
3658      *         component is not displayable or
3659      *         {@code GraphicsEnvironment.isHeadless()} returns {@code true}.
3660      * @throws AWTException if an image with the specified capabilities cannot
3661      *         be created
3662      * @see java.awt.image.VolatileImage
3663      * @since 1.4
3664      */
3665     public VolatileImage createVolatileImage(int width, int height,
3666                                              ImageCapabilities caps)
3667             throws AWTException {
3668         // REMIND : check caps
3669         return createVolatileImage(width, height);
3670     }
3671 
3672     /**
3673      * Prepares an image for rendering on this component.  The image
3674      * data is downloaded asynchronously in another thread and the
3675      * appropriate screen representation of the image is generated.
3676      * @param     image   the {@code Image} for which to
3677      *                    prepare a screen representation
3678      * @param     observer   the {@code ImageObserver} object
3679      *                       to be notified as the image is being prepared
3680      * @return    {@code true} if the image has already been fully
3681      *           prepared; {@code false} otherwise
3682      * @since     1.0
3683      */
3684     public boolean prepareImage(Image image, ImageObserver observer) {
3685         return prepareImage(image, -1, -1, observer);
3686     }
3687 
3688     /**
3689      * Prepares an image for rendering on this component at the
3690      * specified width and height.
3691      * <p>
3692      * The image data is downloaded asynchronously in another thread,
3693      * and an appropriately scaled screen representation of the image is
3694      * generated.
3695      * @param     image    the instance of {@code Image}
3696      *            for which to prepare a screen representation
3697      * @param     width    the width of the desired screen representation
3698      * @param     height   the height of the desired screen representation
3699      * @param     observer   the {@code ImageObserver} object
3700      *            to be notified as the image is being prepared
3701      * @return    {@code true} if the image has already been fully
3702      *          prepared; {@code false} otherwise
3703      * @see       java.awt.image.ImageObserver
3704      * @since     1.0
3705      */
3706     public boolean prepareImage(Image image, int width, int height,
3707                                 ImageObserver observer) {
3708         ComponentPeer peer = this.peer;
3709         if (peer instanceof LightweightPeer) {
3710             return (parent != null)
3711                 ? parent.prepareImage(image, width, height, observer)
3712                 : getToolkit().prepareImage(image, width, height, observer);
3713         } else {
3714             return (peer != null)
3715                 ? peer.prepareImage(image, width, height, observer)
3716                 : getToolkit().prepareImage(image, width, height, observer);
3717         }
3718     }
3719 
3720     /**
3721      * Returns the status of the construction of a screen representation
3722      * of the specified image.
3723      * <p>
3724      * This method does not cause the image to begin loading. An
3725      * application must use the {@code prepareImage} method
3726      * to force the loading of an image.
3727      * <p>
3728      * Information on the flags returned by this method can be found
3729      * with the discussion of the {@code ImageObserver} interface.
3730      * @param     image   the {@code Image} object whose status
3731      *            is being checked
3732      * @param     observer   the {@code ImageObserver}
3733      *            object to be notified as the image is being prepared
3734      * @return  the bitwise inclusive <b>OR</b> of
3735      *            {@code ImageObserver} flags indicating what
3736      *            information about the image is currently available
3737      * @see      #prepareImage(Image, int, int, java.awt.image.ImageObserver)
3738      * @see      Toolkit#checkImage(Image, int, int, java.awt.image.ImageObserver)
3739      * @see      java.awt.image.ImageObserver
3740      * @since    1.0
3741      */
3742     public int checkImage(Image image, ImageObserver observer) {
3743         return checkImage(image, -1, -1, observer);
3744     }
3745 
3746     /**
3747      * Returns the status of the construction of a screen representation
3748      * of the specified image.
3749      * <p>
3750      * This method does not cause the image to begin loading. An
3751      * application must use the {@code prepareImage} method
3752      * to force the loading of an image.
3753      * <p>
3754      * The {@code checkImage} method of {@code Component}
3755      * calls its peer's {@code checkImage} method to calculate
3756      * the flags. If this component does not yet have a peer, the
3757      * component's toolkit's {@code checkImage} method is called
3758      * instead.
3759      * <p>
3760      * Information on the flags returned by this method can be found
3761      * with the discussion of the {@code ImageObserver} interface.
3762      * @param     image   the {@code Image} object whose status
3763      *                    is being checked
3764      * @param     width   the width of the scaled version
3765      *                    whose status is to be checked
3766      * @param     height  the height of the scaled version
3767      *                    whose status is to be checked
3768      * @param     observer   the {@code ImageObserver} object
3769      *                    to be notified as the image is being prepared
3770      * @return    the bitwise inclusive <b>OR</b> of
3771      *            {@code ImageObserver} flags indicating what
3772      *            information about the image is currently available
3773      * @see      #prepareImage(Image, int, int, java.awt.image.ImageObserver)
3774      * @see      Toolkit#checkImage(Image, int, int, java.awt.image.ImageObserver)
3775      * @see      java.awt.image.ImageObserver
3776      * @since    1.0
3777      */
3778     public int checkImage(Image image, int width, int height,
3779                           ImageObserver observer) {
3780         ComponentPeer peer = this.peer;
3781         if (peer instanceof LightweightPeer) {
3782             return (parent != null)
3783                 ? parent.checkImage(image, width, height, observer)
3784                 : getToolkit().checkImage(image, width, height, observer);
3785         } else {
3786             return (peer != null)
3787                 ? peer.checkImage(image, width, height, observer)
3788                 : getToolkit().checkImage(image, width, height, observer);
3789         }
3790     }
3791 
3792     /**
3793      * Creates a new strategy for multi-buffering on this component.
3794      * Multi-buffering is useful for rendering performance.  This method
3795      * attempts to create the best strategy available with the number of
3796      * buffers supplied.  It will always create a {@code BufferStrategy}
3797      * with that number of buffers.
3798      * A page-flipping strategy is attempted first, then a blitting strategy
3799      * using accelerated buffers.  Finally, an unaccelerated blitting
3800      * strategy is used.
3801      * <p>
3802      * Each time this method is called,
3803      * the existing buffer strategy for this component is discarded.
3804      * @param numBuffers number of buffers to create, including the front buffer
3805      * @exception IllegalArgumentException if numBuffers is less than 1.
3806      * @exception IllegalStateException if the component is not displayable
3807      * @see #isDisplayable
3808      * @see Window#getBufferStrategy()
3809      * @see Canvas#getBufferStrategy()
3810      * @since 1.4
3811      */
3812     void createBufferStrategy(int numBuffers) {
3813         BufferCapabilities bufferCaps;
3814         if (numBuffers > 1) {
3815             // Try to create a page-flipping strategy
3816             bufferCaps = new BufferCapabilities(new ImageCapabilities(true),
3817                                                 new ImageCapabilities(true),
3818                                                 BufferCapabilities.FlipContents.UNDEFINED);
3819             try {
3820                 createBufferStrategy(numBuffers, bufferCaps);
3821                 return; // Success
3822             } catch (AWTException e) {
3823                 // Failed
3824             }
3825         }
3826         // Try a blitting (but still accelerated) strategy
3827         bufferCaps = new BufferCapabilities(new ImageCapabilities(true),
3828                                             new ImageCapabilities(true),
3829                                             null);
3830         try {
3831             createBufferStrategy(numBuffers, bufferCaps);
3832             return; // Success
3833         } catch (AWTException e) {
3834             // Failed
3835         }
3836         // Try an unaccelerated blitting strategy
3837         bufferCaps = new BufferCapabilities(new ImageCapabilities(false),
3838                                             new ImageCapabilities(false),
3839                                             null);
3840         try {
3841             createBufferStrategy(numBuffers, bufferCaps);
3842             return; // Success
3843         } catch (AWTException e) {
3844             // Code should never reach here (an unaccelerated blitting
3845             // strategy should always work)
3846             throw new InternalError("Could not create a buffer strategy", e);
3847         }
3848     }
3849 
3850     /**
3851      * Creates a new strategy for multi-buffering on this component with the
3852      * required buffer capabilities.  This is useful, for example, if only
3853      * accelerated memory or page flipping is desired (as specified by the
3854      * buffer capabilities).
3855      * <p>
3856      * Each time this method
3857      * is called, {@code dispose} will be invoked on the existing
3858      * {@code BufferStrategy}.
3859      * @param numBuffers number of buffers to create
3860      * @param caps the required capabilities for creating the buffer strategy;
3861      * cannot be {@code null}
3862      * @exception AWTException if the capabilities supplied could not be
3863      * supported or met; this may happen, for example, if there is not enough
3864      * accelerated memory currently available, or if page flipping is specified
3865      * but not possible.
3866      * @exception IllegalArgumentException if numBuffers is less than 1, or if
3867      * caps is {@code null}
3868      * @see Window#getBufferStrategy()
3869      * @see Canvas#getBufferStrategy()
3870      * @since 1.4
3871      */
3872     void createBufferStrategy(int numBuffers,
3873                               BufferCapabilities caps) throws AWTException {
3874         // Check arguments
3875         if (numBuffers < 1) {
3876             throw new IllegalArgumentException(
3877                 "Number of buffers must be at least 1");
3878         }
3879         if (caps == null) {
3880             throw new IllegalArgumentException("No capabilities specified");
3881         }
3882         // Destroy old buffers
3883         if (bufferStrategy != null) {
3884             bufferStrategy.dispose();
3885         }
3886         if (numBuffers == 1) {
3887             bufferStrategy = new SingleBufferStrategy(caps);
3888         } else {
3889             SunGraphicsEnvironment sge = (SunGraphicsEnvironment)
3890                 GraphicsEnvironment.getLocalGraphicsEnvironment();
3891             if (!caps.isPageFlipping() && sge.isFlipStrategyPreferred(peer)) {
3892                 caps = new ProxyCapabilities(caps);
3893             }
3894             // assert numBuffers > 1;
3895             if (caps.isPageFlipping()) {
3896                 bufferStrategy = new FlipSubRegionBufferStrategy(numBuffers, caps);
3897             } else {
3898                 bufferStrategy = new BltSubRegionBufferStrategy(numBuffers, caps);
3899             }
3900         }
3901     }
3902 
3903     /**
3904      * This is a proxy capabilities class used when a FlipBufferStrategy
3905      * is created instead of the requested Blit strategy.
3906      *
3907      * @see sun.java2d.SunGraphicsEnvironment#isFlipStrategyPreferred(ComponentPeer)
3908      */
3909     private class ProxyCapabilities extends ExtendedBufferCapabilities {
3910         private BufferCapabilities orig;
3911         private ProxyCapabilities(BufferCapabilities orig) {
3912             super(orig.getFrontBufferCapabilities(),
3913                   orig.getBackBufferCapabilities(),
3914                   orig.getFlipContents() ==
3915                       BufferCapabilities.FlipContents.BACKGROUND ?
3916                       BufferCapabilities.FlipContents.BACKGROUND :
3917                       BufferCapabilities.FlipContents.COPIED);
3918             this.orig = orig;
3919         }
3920     }
3921 
3922     /**
3923      * @return the buffer strategy used by this component
3924      * @see Window#createBufferStrategy
3925      * @see Canvas#createBufferStrategy
3926      * @since 1.4
3927      */
3928     BufferStrategy getBufferStrategy() {
3929         return bufferStrategy;
3930     }
3931 
3932     /**
3933      * @return the back buffer currently used by this component's
3934      * BufferStrategy.  If there is no BufferStrategy or no
3935      * back buffer, this method returns null.
3936      */
3937     Image getBackBuffer() {
3938         if (bufferStrategy != null) {
3939             if (bufferStrategy instanceof BltBufferStrategy) {
3940                 BltBufferStrategy bltBS = (BltBufferStrategy)bufferStrategy;
3941                 return bltBS.getBackBuffer();
3942             } else if (bufferStrategy instanceof FlipBufferStrategy) {
3943                 FlipBufferStrategy flipBS = (FlipBufferStrategy)bufferStrategy;
3944                 return flipBS.getBackBuffer();
3945             }
3946         }
3947         return null;
3948     }
3949 
3950     /**
3951      * Inner class for flipping buffers on a component.  That component must
3952      * be a {@code Canvas} or {@code Window} or {@code Applet}.
3953      * @see Canvas
3954      * @see Window
3955      * @see Applet
3956      * @see java.awt.image.BufferStrategy
3957      * @author Michael Martak
3958      * @since 1.4
3959      */
3960     protected class FlipBufferStrategy extends BufferStrategy {
3961         /**
3962          * The number of buffers
3963          */
3964         protected int numBuffers; // = 0
3965         /**
3966          * The buffering capabilities
3967          */
3968         protected BufferCapabilities caps; // = null
3969         /**
3970          * The drawing buffer
3971          */
3972         protected Image drawBuffer; // = null
3973         /**
3974          * The drawing buffer as a volatile image
3975          */
3976         protected VolatileImage drawVBuffer; // = null
3977         /**
3978          * Whether or not the drawing buffer has been recently restored from
3979          * a lost state.
3980          */
3981         protected boolean validatedContents; // = false
3982 
3983         /**
3984          * Size of the back buffers.  (Note: these fields were added in 6.0
3985          * but kept package-private to avoid exposing them in the spec.
3986          * None of these fields/methods really should have been marked
3987          * protected when they were introduced in 1.4, but now we just have
3988          * to live with that decision.)
3989          */
3990 
3991          /**
3992           * The width of the back buffers
3993           */
3994         int width;
3995 
3996         /**
3997          * The height of the back buffers
3998          */
3999         int height;
4000 
4001         /**
4002          * Creates a new flipping buffer strategy for this component.
4003          * The component must be a {@code Canvas} or {@code Window} or
4004          * {@code Applet}.
4005          * @see Canvas
4006          * @see Window
4007          * @see Applet
4008          * @param numBuffers the number of buffers
4009          * @param caps the capabilities of the buffers
4010          * @exception AWTException if the capabilities supplied could not be
4011          * supported or met
4012          * @exception ClassCastException if the component is not a canvas or
4013          * window.
4014          * @exception IllegalStateException if the component has no peer
4015          * @exception IllegalArgumentException if {@code numBuffers} is less than two,
4016          * or if {@code BufferCapabilities.isPageFlipping} is not
4017          * {@code true}.
4018          * @see #createBuffers(int, BufferCapabilities)
4019          */
4020         @SuppressWarnings("deprecation")
4021         protected FlipBufferStrategy(int numBuffers, BufferCapabilities caps)
4022             throws AWTException
4023         {
4024             if (!(Component.this instanceof Window) &&
4025                 !(Component.this instanceof Canvas) &&
4026                 !(Component.this instanceof Applet))
4027             {
4028                 throw new ClassCastException(
4029                         "Component must be a Canvas or Window or Applet");
4030             }
4031             this.numBuffers = numBuffers;
4032             this.caps = caps;
4033             createBuffers(numBuffers, caps);
4034         }
4035 
4036         /**
4037          * Creates one or more complex, flipping buffers with the given
4038          * capabilities.
4039          * @param numBuffers number of buffers to create; must be greater than
4040          * one
4041          * @param caps the capabilities of the buffers.
4042          * {@code BufferCapabilities.isPageFlipping} must be
4043          * {@code true}.
4044          * @exception AWTException if the capabilities supplied could not be
4045          * supported or met
4046          * @exception IllegalStateException if the component has no peer
4047          * @exception IllegalArgumentException if numBuffers is less than two,
4048          * or if {@code BufferCapabilities.isPageFlipping} is not
4049          * {@code true}.
4050          * @see java.awt.BufferCapabilities#isPageFlipping()
4051          */
4052         protected void createBuffers(int numBuffers, BufferCapabilities caps)
4053             throws AWTException
4054         {
4055             if (numBuffers < 2) {
4056                 throw new IllegalArgumentException(
4057                     "Number of buffers cannot be less than two");
4058             } else if (peer == null) {
4059                 throw new IllegalStateException(
4060                     "Component must have a valid peer");
4061             } else if (caps == null || !caps.isPageFlipping()) {
4062                 throw new IllegalArgumentException(
4063                     "Page flipping capabilities must be specified");
4064             }
4065 
4066             // save the current bounds
4067             width = getWidth();
4068             height = getHeight();
4069 
4070             if (drawBuffer != null) {
4071                 // dispose the existing backbuffers
4072                 drawBuffer = null;
4073                 drawVBuffer = null;
4074                 destroyBuffers();
4075                 // ... then recreate the backbuffers
4076             }
4077 
4078             if (caps instanceof ExtendedBufferCapabilities) {
4079                 ExtendedBufferCapabilities ebc =
4080                     (ExtendedBufferCapabilities)caps;
4081                 if (ebc.getVSync() == VSYNC_ON) {
4082                     // if this buffer strategy is not allowed to be v-synced,
4083                     // change the caps that we pass to the peer but keep on
4084                     // trying to create v-synced buffers;
4085                     // do not throw IAE here in case it is disallowed, see
4086                     // ExtendedBufferCapabilities for more info
4087                     if (!VSyncedBSManager.vsyncAllowed(this)) {
4088                         caps = ebc.derive(VSYNC_DEFAULT);
4089                     }
4090                 }
4091             }
4092 
4093             peer.createBuffers(numBuffers, caps);
4094             updateInternalBuffers();
4095         }
4096 
4097         /**
4098          * Updates internal buffers (both volatile and non-volatile)
4099          * by requesting the back-buffer from the peer.
4100          */
4101         private void updateInternalBuffers() {
4102             // get the images associated with the draw buffer
4103             drawBuffer = getBackBuffer();
4104             if (drawBuffer instanceof VolatileImage) {
4105                 drawVBuffer = (VolatileImage)drawBuffer;
4106             } else {
4107                 drawVBuffer = null;
4108             }
4109         }
4110 
4111         /**
4112          * @return direct access to the back buffer, as an image.
4113          * @exception IllegalStateException if the buffers have not yet
4114          * been created
4115          */
4116         protected Image getBackBuffer() {
4117             if (peer != null) {
4118                 return peer.getBackBuffer();
4119             } else {
4120                 throw new IllegalStateException(
4121                     "Component must have a valid peer");
4122             }
4123         }
4124 
4125         /**
4126          * Flipping moves the contents of the back buffer to the front buffer,
4127          * either by copying or by moving the video pointer.
4128          * @param flipAction an integer value describing the flipping action
4129          * for the contents of the back buffer.  This should be one of the
4130          * values of the {@code BufferCapabilities.FlipContents}
4131          * property.
4132          * @exception IllegalStateException if the buffers have not yet
4133          * been created
4134          * @see java.awt.BufferCapabilities#getFlipContents()
4135          */
4136         protected void flip(BufferCapabilities.FlipContents flipAction) {
4137             if (peer != null) {
4138                 Image backBuffer = getBackBuffer();
4139                 if (backBuffer != null) {
4140                     peer.flip(0, 0,
4141                               backBuffer.getWidth(null),
4142                               backBuffer.getHeight(null), flipAction);
4143                 }
4144             } else {
4145                 throw new IllegalStateException(
4146                     "Component must have a valid peer");
4147             }
4148         }
4149 
4150         void flipSubRegion(int x1, int y1, int x2, int y2,
4151                       BufferCapabilities.FlipContents flipAction)
4152         {
4153             if (peer != null) {
4154                 peer.flip(x1, y1, x2, y2, flipAction);
4155             } else {
4156                 throw new IllegalStateException(
4157                     "Component must have a valid peer");
4158             }
4159         }
4160 
4161         /**
4162          * Destroys the buffers created through this object
4163          */
4164         protected void destroyBuffers() {
4165             VSyncedBSManager.releaseVsync(this);
4166             if (peer != null) {
4167                 peer.destroyBuffers();
4168             } else {
4169                 throw new IllegalStateException(
4170                     "Component must have a valid peer");
4171             }
4172         }
4173 
4174         /**
4175          * @return the buffering capabilities of this strategy
4176          */
4177         public BufferCapabilities getCapabilities() {
4178             if (caps instanceof ProxyCapabilities) {
4179                 return ((ProxyCapabilities)caps).orig;
4180             } else {
4181                 return caps;
4182             }
4183         }
4184 
4185         /**
4186          * @return the graphics on the drawing buffer.  This method may not
4187          * be synchronized for performance reasons; use of this method by multiple
4188          * threads should be handled at the application level.  Disposal of the
4189          * graphics object must be handled by the application.
4190          */
4191         public Graphics getDrawGraphics() {
4192             revalidate();
4193             return drawBuffer.getGraphics();
4194         }
4195 
4196         /**
4197          * Restore the drawing buffer if it has been lost
4198          */
4199         protected void revalidate() {
4200             revalidate(true);
4201         }
4202 
4203         void revalidate(boolean checkSize) {
4204             validatedContents = false;
4205 
4206             if (checkSize && (getWidth() != width || getHeight() != height)) {
4207                 // component has been resized; recreate the backbuffers
4208                 try {
4209                     createBuffers(numBuffers, caps);
4210                 } catch (AWTException e) {
4211                     // shouldn't be possible
4212                 }
4213                 validatedContents = true;
4214             }
4215 
4216             // get the buffers from the peer every time since they
4217             // might have been replaced in response to a display change event
4218             updateInternalBuffers();
4219 
4220             // now validate the backbuffer
4221             if (drawVBuffer != null) {
4222                 GraphicsConfiguration gc =
4223                         getGraphicsConfiguration_NoClientCode();
4224                 int returnCode = drawVBuffer.validate(gc);
4225                 if (returnCode == VolatileImage.IMAGE_INCOMPATIBLE) {
4226                     try {
4227                         createBuffers(numBuffers, caps);
4228                     } catch (AWTException e) {
4229                         // shouldn't be possible
4230                     }
4231                     if (drawVBuffer != null) {
4232                         // backbuffers were recreated, so validate again
4233                         drawVBuffer.validate(gc);
4234                     }
4235                     validatedContents = true;
4236                 } else if (returnCode == VolatileImage.IMAGE_RESTORED) {
4237                     validatedContents = true;
4238                 }
4239             }
4240         }
4241 
4242         /**
4243          * @return whether the drawing buffer was lost since the last call to
4244          * {@code getDrawGraphics}
4245          */
4246         public boolean contentsLost() {
4247             if (drawVBuffer == null) {
4248                 return false;
4249             }
4250             return drawVBuffer.contentsLost();
4251         }
4252 
4253         /**
4254          * @return whether the drawing buffer was recently restored from a lost
4255          * state and reinitialized to the default background color (white)
4256          */
4257         public boolean contentsRestored() {
4258             return validatedContents;
4259         }
4260 
4261         /**
4262          * Makes the next available buffer visible by either blitting or
4263          * flipping.
4264          */
4265         public void show() {
4266             flip(caps.getFlipContents());
4267         }
4268 
4269         /**
4270          * Makes specified region of the next available buffer visible
4271          * by either blitting or flipping.
4272          */
4273         void showSubRegion(int x1, int y1, int x2, int y2) {
4274             flipSubRegion(x1, y1, x2, y2, caps.getFlipContents());
4275         }
4276 
4277         /**
4278          * {@inheritDoc}
4279          * @since 1.6
4280          */
4281         public void dispose() {
4282             if (Component.this.bufferStrategy == this) {
4283                 Component.this.bufferStrategy = null;
4284                 if (peer != null) {
4285                     destroyBuffers();
4286                 }
4287             }
4288         }
4289 
4290     } // Inner class FlipBufferStrategy
4291 
4292     /**
4293      * Inner class for blitting offscreen surfaces to a component.
4294      *
4295      * @author Michael Martak
4296      * @since 1.4
4297      */
4298     protected class BltBufferStrategy extends BufferStrategy {
4299 
4300         /**
4301          * The buffering capabilities
4302          */
4303         protected BufferCapabilities caps; // = null
4304         /**
4305          * The back buffers
4306          */
4307         protected VolatileImage[] backBuffers; // = null
4308         /**
4309          * Whether or not the drawing buffer has been recently restored from
4310          * a lost state.
4311          */
4312         protected boolean validatedContents; // = false
4313         /**
4314          * Width of the back buffers
4315          */
4316         protected int width;
4317         /**
4318          * Height of the back buffers
4319          */
4320         protected int height;
4321 
4322         /**
4323          * Insets for the hosting Component.  The size of the back buffer
4324          * is constrained by these.
4325          */
4326         private Insets insets;
4327 
4328         /**
4329          * Creates a new blt buffer strategy around a component
4330          * @param numBuffers number of buffers to create, including the
4331          * front buffer
4332          * @param caps the capabilities of the buffers
4333          */
4334         protected BltBufferStrategy(int numBuffers, BufferCapabilities caps) {
4335             this.caps = caps;
4336             createBackBuffers(numBuffers - 1);
4337         }
4338 
4339         /**
4340          * {@inheritDoc}
4341          * @since 1.6
4342          */
4343         public void dispose() {
4344             if (backBuffers != null) {
4345                 for (int counter = backBuffers.length - 1; counter >= 0;
4346                      counter--) {
4347                     if (backBuffers[counter] != null) {
4348                         backBuffers[counter].flush();
4349                         backBuffers[counter] = null;
4350                     }
4351                 }
4352             }
4353             if (Component.this.bufferStrategy == this) {
4354                 Component.this.bufferStrategy = null;
4355             }
4356         }
4357 
4358         /**
4359          * Creates the back buffers
4360          *
4361          * @param numBuffers the number of buffers to create
4362          */
4363         protected void createBackBuffers(int numBuffers) {
4364             if (numBuffers == 0) {
4365                 backBuffers = null;
4366             } else {
4367                 // save the current bounds
4368                 width = getWidth();
4369                 height = getHeight();
4370                 insets = getInsets_NoClientCode();
4371                 int iWidth = width - insets.left - insets.right;
4372                 int iHeight = height - insets.top - insets.bottom;
4373 
4374                 // It is possible for the component's width and/or height
4375                 // to be 0 here.  Force the size of the backbuffers to
4376                 // be > 0 so that creating the image won't fail.
4377                 iWidth = Math.max(1, iWidth);
4378                 iHeight = Math.max(1, iHeight);
4379                 if (backBuffers == null) {
4380                     backBuffers = new VolatileImage[numBuffers];
4381                 } else {
4382                     // flush any existing backbuffers
4383                     for (int i = 0; i < numBuffers; i++) {
4384                         if (backBuffers[i] != null) {
4385                             backBuffers[i].flush();
4386                             backBuffers[i] = null;
4387                         }
4388                     }
4389                 }
4390 
4391                 // create the backbuffers
4392                 for (int i = 0; i < numBuffers; i++) {
4393                     backBuffers[i] = createVolatileImage(iWidth, iHeight);
4394                 }
4395             }
4396         }
4397 
4398         /**
4399          * @return the buffering capabilities of this strategy
4400          */
4401         public BufferCapabilities getCapabilities() {
4402             return caps;
4403         }
4404 
4405         /**
4406          * @return the draw graphics
4407          */
4408         public Graphics getDrawGraphics() {
4409             revalidate();
4410             Image backBuffer = getBackBuffer();
4411             if (backBuffer == null) {
4412                 return getGraphics();
4413             }
4414             SunGraphics2D g = (SunGraphics2D)backBuffer.getGraphics();
4415             g.constrain(-insets.left, -insets.top,
4416                         backBuffer.getWidth(null) + insets.left,
4417                         backBuffer.getHeight(null) + insets.top);
4418             return g;
4419         }
4420 
4421         /**
4422          * @return direct access to the back buffer, as an image.
4423          * If there is no back buffer, returns null.
4424          */
4425         Image getBackBuffer() {
4426             if (backBuffers != null) {
4427                 return backBuffers[backBuffers.length - 1];
4428             } else {
4429                 return null;
4430             }
4431         }
4432 
4433         /**
4434          * Makes the next available buffer visible.
4435          */
4436         public void show() {
4437             showSubRegion(insets.left, insets.top,
4438                           width - insets.right,
4439                           height - insets.bottom);
4440         }
4441 
4442         /**
4443          * Package-private method to present a specific rectangular area
4444          * of this buffer.  This class currently shows only the entire
4445          * buffer, by calling showSubRegion() with the full dimensions of
4446          * the buffer.  Subclasses (e.g., BltSubRegionBufferStrategy
4447          * and FlipSubRegionBufferStrategy) may have region-specific show
4448          * methods that call this method with actual sub regions of the
4449          * buffer.
4450          */
4451         void showSubRegion(int x1, int y1, int x2, int y2) {
4452             if (backBuffers == null) {
4453                 return;
4454             }
4455             // Adjust location to be relative to client area.
4456             x1 -= insets.left;
4457             x2 -= insets.left;
4458             y1 -= insets.top;
4459             y2 -= insets.top;
4460             Graphics g = getGraphics_NoClientCode();
4461             if (g == null) {
4462                 // Not showing, bail
4463                 return;
4464             }
4465             try {
4466                 // First image copy is in terms of Frame's coordinates, need
4467                 // to translate to client area.
4468                 g.translate(insets.left, insets.top);
4469                 for (int i = 0; i < backBuffers.length; i++) {
4470                     g.drawImage(backBuffers[i],
4471                                 x1, y1, x2, y2,
4472                                 x1, y1, x2, y2,
4473                                 null);
4474                     g.dispose();
4475                     g = null;
4476                     g = backBuffers[i].getGraphics();
4477                 }
4478             } finally {
4479                 if (g != null) {
4480                     g.dispose();
4481                 }
4482             }
4483         }
4484 
4485         /**
4486          * Restore the drawing buffer if it has been lost
4487          */
4488         protected void revalidate() {
4489             revalidate(true);
4490         }
4491 
4492         void revalidate(boolean checkSize) {
4493             validatedContents = false;
4494 
4495             if (backBuffers == null) {
4496                 return;
4497             }
4498 
4499             if (checkSize) {
4500                 Insets insets = getInsets_NoClientCode();
4501                 if (getWidth() != width || getHeight() != height ||
4502                     !insets.equals(this.insets)) {
4503                     // component has been resized; recreate the backbuffers
4504                     createBackBuffers(backBuffers.length);
4505                     validatedContents = true;
4506                 }
4507             }
4508 
4509             // now validate the backbuffer
4510             GraphicsConfiguration gc = getGraphicsConfiguration_NoClientCode();
4511             int returnCode =
4512                 backBuffers[backBuffers.length - 1].validate(gc);
4513             if (returnCode == VolatileImage.IMAGE_INCOMPATIBLE) {
4514                 if (checkSize) {
4515                     createBackBuffers(backBuffers.length);
4516                     // backbuffers were recreated, so validate again
4517                     backBuffers[backBuffers.length - 1].validate(gc);
4518                 }
4519                 // else case means we're called from Swing on the toolkit
4520                 // thread, don't recreate buffers as that'll deadlock
4521                 // (creating VolatileImages invokes getting GraphicsConfig
4522                 // which grabs treelock).
4523                 validatedContents = true;
4524             } else if (returnCode == VolatileImage.IMAGE_RESTORED) {
4525                 validatedContents = true;
4526             }
4527         }
4528 
4529         /**
4530          * @return whether the drawing buffer was lost since the last call to
4531          * {@code getDrawGraphics}
4532          */
4533         public boolean contentsLost() {
4534             if (backBuffers == null) {
4535                 return false;
4536             } else {
4537                 return backBuffers[backBuffers.length - 1].contentsLost();
4538             }
4539         }
4540 
4541         /**
4542          * @return whether the drawing buffer was recently restored from a lost
4543          * state and reinitialized to the default background color (white)
4544          */
4545         public boolean contentsRestored() {
4546             return validatedContents;
4547         }
4548     } // Inner class BltBufferStrategy
4549 
4550     /**
4551      * Private class to perform sub-region flipping.
4552      */
4553     private class FlipSubRegionBufferStrategy extends FlipBufferStrategy
4554         implements SubRegionShowable
4555     {
4556 
4557         protected FlipSubRegionBufferStrategy(int numBuffers,
4558                                               BufferCapabilities caps)
4559             throws AWTException
4560         {
4561             super(numBuffers, caps);
4562         }
4563 
4564         public void show(int x1, int y1, int x2, int y2) {
4565             showSubRegion(x1, y1, x2, y2);
4566         }
4567 
4568         // This is invoked by Swing on the toolkit thread.
4569         public boolean showIfNotLost(int x1, int y1, int x2, int y2) {
4570             if (!contentsLost()) {
4571                 showSubRegion(x1, y1, x2, y2);
4572                 return !contentsLost();
4573             }
4574             return false;
4575         }
4576     }
4577 
4578     /**
4579      * Private class to perform sub-region blitting.  Swing will use
4580      * this subclass via the SubRegionShowable interface in order to
4581      * copy only the area changed during a repaint.
4582      * See javax.swing.BufferStrategyPaintManager.
4583      */
4584     private class BltSubRegionBufferStrategy extends BltBufferStrategy
4585         implements SubRegionShowable
4586     {
4587 
4588         protected BltSubRegionBufferStrategy(int numBuffers,
4589                                              BufferCapabilities caps)
4590         {
4591             super(numBuffers, caps);
4592         }
4593 
4594         public void show(int x1, int y1, int x2, int y2) {
4595             showSubRegion(x1, y1, x2, y2);
4596         }
4597 
4598         // This method is called by Swing on the toolkit thread.
4599         public boolean showIfNotLost(int x1, int y1, int x2, int y2) {
4600             if (!contentsLost()) {
4601                 showSubRegion(x1, y1, x2, y2);
4602                 return !contentsLost();
4603             }
4604             return false;
4605         }
4606     }
4607 
4608     /**
4609      * Inner class for flipping buffers on a component.  That component must
4610      * be a {@code Canvas} or {@code Window}.
4611      * @see Canvas
4612      * @see Window
4613      * @see java.awt.image.BufferStrategy
4614      * @author Michael Martak
4615      * @since 1.4
4616      */
4617     private class SingleBufferStrategy extends BufferStrategy {
4618 
4619         private BufferCapabilities caps;
4620 
4621         public SingleBufferStrategy(BufferCapabilities caps) {
4622             this.caps = caps;
4623         }
4624         public BufferCapabilities getCapabilities() {
4625             return caps;
4626         }
4627         public Graphics getDrawGraphics() {
4628             return getGraphics();
4629         }
4630         public boolean contentsLost() {
4631             return false;
4632         }
4633         public boolean contentsRestored() {
4634             return false;
4635         }
4636         public void show() {
4637             // Do nothing
4638         }
4639     } // Inner class SingleBufferStrategy
4640 
4641     /**
4642      * Sets whether or not paint messages received from the operating system
4643      * should be ignored.  This does not affect paint events generated in
4644      * software by the AWT, unless they are an immediate response to an
4645      * OS-level paint message.
4646      * <p>
4647      * This is useful, for example, if running under full-screen mode and
4648      * better performance is desired, or if page-flipping is used as the
4649      * buffer strategy.
4650      *
4651      * @param ignoreRepaint {@code true} if the paint messages from the OS
4652      *                      should be ignored; otherwise {@code false}
4653      *
4654      * @since 1.4
4655      * @see #getIgnoreRepaint
4656      * @see Canvas#createBufferStrategy
4657      * @see Window#createBufferStrategy
4658      * @see java.awt.image.BufferStrategy
4659      * @see GraphicsDevice#setFullScreenWindow
4660      */
4661     public void setIgnoreRepaint(boolean ignoreRepaint) {
4662         this.ignoreRepaint = ignoreRepaint;
4663     }
4664 
4665     /**
4666      * @return whether or not paint messages received from the operating system
4667      * should be ignored.
4668      *
4669      * @since 1.4
4670      * @see #setIgnoreRepaint
4671      */
4672     public boolean getIgnoreRepaint() {
4673         return ignoreRepaint;
4674     }
4675 
4676     /**
4677      * Checks whether this component "contains" the specified point,
4678      * where {@code x} and {@code y} are defined to be
4679      * relative to the coordinate system of this component.
4680      *
4681      * @param     x   the <i>x</i> coordinate of the point
4682      * @param     y   the <i>y</i> coordinate of the point
4683      * @return {@code true} if the point is within the component;
4684      *         otherwise {@code false}
4685      * @see       #getComponentAt(int, int)
4686      * @since     1.1
4687      */
4688     public boolean contains(int x, int y) {
4689         return inside(x, y);
4690     }
4691 
4692     /**
4693      * Checks whether the point is inside of this component.
4694      *
4695      * @param  x the <i>x</i> coordinate of the point
4696      * @param  y the <i>y</i> coordinate of the point
4697      * @return {@code true} if the point is within the component;
4698      *         otherwise {@code false}
4699      * @deprecated As of JDK version 1.1,
4700      * replaced by contains(int, int).
4701      */
4702     @Deprecated
4703     public boolean inside(int x, int y) {
4704         return (x >= 0) && (x < width) && (y >= 0) && (y < height);
4705     }
4706 
4707     /**
4708      * Checks whether this component "contains" the specified point,
4709      * where the point's <i>x</i> and <i>y</i> coordinates are defined
4710      * to be relative to the coordinate system of this component.
4711      *
4712      * @param     p     the point
4713      * @return {@code true} if the point is within the component;
4714      *         otherwise {@code false}
4715      * @throws    NullPointerException if {@code p} is {@code null}
4716      * @see       #getComponentAt(Point)
4717      * @since     1.1
4718      */
4719     public boolean contains(Point p) {
4720         return contains(p.x, p.y);
4721     }
4722 
4723     /**
4724      * Determines if this component or one of its immediate
4725      * subcomponents contains the (<i>x</i>,&nbsp;<i>y</i>) location,
4726      * and if so, returns the containing component. This method only
4727      * looks one level deep. If the point (<i>x</i>,&nbsp;<i>y</i>) is
4728      * inside a subcomponent that itself has subcomponents, it does not
4729      * go looking down the subcomponent tree.
4730      * <p>
4731      * The {@code locate} method of {@code Component} simply
4732      * returns the component itself if the (<i>x</i>,&nbsp;<i>y</i>)
4733      * coordinate location is inside its bounding box, and {@code null}
4734      * otherwise.
4735      * @param     x   the <i>x</i> coordinate
4736      * @param     y   the <i>y</i> coordinate
4737      * @return    the component or subcomponent that contains the
4738      *                (<i>x</i>,&nbsp;<i>y</i>) location;
4739      *                {@code null} if the location
4740      *                is outside this component
4741      * @see       #contains(int, int)
4742      * @since     1.0
4743      */
4744     public Component getComponentAt(int x, int y) {
4745         return locate(x, y);
4746     }
4747 
4748     /**
4749      * Returns the component occupying the position specified (this component,
4750      * or immediate child component, or null if neither
4751      * of the first two occupies the location).
4752      *
4753      * @param  x the <i>x</i> coordinate to search for components at
4754      * @param  y the <i>y</i> coordinate to search for components at
4755      * @return the component at the specified location or {@code null}
4756      * @deprecated As of JDK version 1.1,
4757      * replaced by getComponentAt(int, int).
4758      */
4759     @Deprecated
4760     public Component locate(int x, int y) {
4761         return contains(x, y) ? this : null;
4762     }
4763 
4764     /**
4765      * Returns the component or subcomponent that contains the
4766      * specified point.
4767      * @param  p the point
4768      * @return the component at the specified location or {@code null}
4769      * @see java.awt.Component#contains
4770      * @since 1.1
4771      */
4772     public Component getComponentAt(Point p) {
4773         return getComponentAt(p.x, p.y);
4774     }
4775 
4776     /**
4777      * @param  e the event to deliver
4778      * @deprecated As of JDK version 1.1,
4779      * replaced by {@code dispatchEvent(AWTEvent e)}.
4780      */
4781     @Deprecated
4782     public void deliverEvent(Event e) {
4783         postEvent(e);
4784     }
4785 
4786     /**
4787      * Dispatches an event to this component or one of its sub components.
4788      * Calls {@code processEvent} before returning for 1.1-style
4789      * events which have been enabled for the {@code Component}.
4790      * @param e the event
4791      */
4792     public final void dispatchEvent(AWTEvent e) {
4793         dispatchEventImpl(e);
4794     }
4795 
4796     @SuppressWarnings("deprecation")
4797     void dispatchEventImpl(AWTEvent e) {
4798         int id = e.getID();
4799 
4800         // Check that this component belongs to this app-context
4801         AppContext compContext = appContext;
4802         if (compContext != null && !compContext.equals(AppContext.getAppContext())) {
4803             if (eventLog.isLoggable(PlatformLogger.Level.FINE)) {
4804                 eventLog.fine("Event " + e + " is being dispatched on the wrong AppContext");
4805             }
4806         }
4807 
4808         if (eventLog.isLoggable(PlatformLogger.Level.FINEST)) {
4809             eventLog.finest("{0}", e);
4810         }
4811 
4812         /*
4813          * 0. Set timestamp and modifiers of current event.
4814          */
4815         if (!(e instanceof KeyEvent)) {
4816             // Timestamp of a key event is set later in DKFM.preDispatchKeyEvent(KeyEvent).
4817             EventQueue.setCurrentEventAndMostRecentTime(e);
4818         }
4819 
4820         /*
4821          * 1. Pre-dispatchers. Do any necessary retargeting/reordering here
4822          *    before we notify AWTEventListeners.
4823          */
4824 
4825         if (e instanceof SunDropTargetEvent) {
4826             ((SunDropTargetEvent)e).dispatch();
4827             return;
4828         }
4829 
4830         if (!e.focusManagerIsDispatching) {
4831             // Invoke the private focus retargeting method which provides
4832             // lightweight Component support
4833             if (e.isPosted) {
4834                 e = KeyboardFocusManager.retargetFocusEvent(e);
4835                 e.isPosted = true;
4836             }
4837 
4838             // Now, with the event properly targeted to a lightweight
4839             // descendant if necessary, invoke the public focus retargeting
4840             // and dispatching function
4841             if (KeyboardFocusManager.getCurrentKeyboardFocusManager().
4842                 dispatchEvent(e))
4843             {
4844                 return;
4845             }
4846         }
4847         if ((e instanceof FocusEvent) && focusLog.isLoggable(PlatformLogger.Level.FINEST)) {
4848             focusLog.finest("" + e);
4849         }
4850         // MouseWheel may need to be retargeted here so that
4851         // AWTEventListener sees the event go to the correct
4852         // Component.  If the MouseWheelEvent needs to go to an ancestor,
4853         // the event is dispatched to the ancestor, and dispatching here
4854         // stops.
4855         if (id == MouseEvent.MOUSE_WHEEL &&
4856             (!eventTypeEnabled(id)) &&
4857             (peer != null && !peer.handlesWheelScrolling()) &&
4858             (dispatchMouseWheelToAncestor((MouseWheelEvent)e)))
4859         {
4860             return;
4861         }
4862 
4863         /*
4864          * 2. Allow the Toolkit to pass this to AWTEventListeners.
4865          */
4866         Toolkit toolkit = Toolkit.getDefaultToolkit();
4867         toolkit.notifyAWTEventListeners(e);
4868 
4869 
4870         /*
4871          * 3. If no one has consumed a key event, allow the
4872          *    KeyboardFocusManager to process it.
4873          */
4874         if (!e.isConsumed()) {
4875             if (e instanceof java.awt.event.KeyEvent) {
4876                 KeyboardFocusManager.getCurrentKeyboardFocusManager().
4877                     processKeyEvent(this, (KeyEvent)e);
4878                 if (e.isConsumed()) {
4879                     return;
4880                 }
4881             }
4882         }
4883 
4884         /*
4885          * 4. Allow input methods to process the event
4886          */
4887         if (areInputMethodsEnabled()) {
4888             // We need to pass on InputMethodEvents since some host
4889             // input method adapters send them through the Java
4890             // event queue instead of directly to the component,
4891             // and the input context also handles the Java composition window
4892             if(((e instanceof InputMethodEvent) && !(this instanceof CompositionArea))
4893                ||
4894                // Otherwise, we only pass on input and focus events, because
4895                // a) input methods shouldn't know about semantic or component-level events
4896                // b) passing on the events takes time
4897                // c) isConsumed() is always true for semantic events.
4898                (e instanceof InputEvent) || (e instanceof FocusEvent)) {
4899                 InputContext inputContext = getInputContext();
4900 
4901 
4902                 if (inputContext != null) {
4903                     inputContext.dispatchEvent(e);
4904                     if (e.isConsumed()) {
4905                         if ((e instanceof FocusEvent) && focusLog.isLoggable(PlatformLogger.Level.FINEST)) {
4906                             focusLog.finest("3579: Skipping " + e);
4907                         }
4908                         return;
4909                     }
4910                 }
4911             }
4912         } else {
4913             // When non-clients get focus, we need to explicitly disable the native
4914             // input method. The native input method is actually not disabled when
4915             // the active/passive/peered clients loose focus.
4916             if (id == FocusEvent.FOCUS_GAINED) {
4917                 InputContext inputContext = getInputContext();
4918                 if (inputContext != null && inputContext instanceof sun.awt.im.InputContext) {
4919                     ((sun.awt.im.InputContext)inputContext).disableNativeIM();
4920                 }
4921             }
4922         }
4923 
4924 
4925         /*
4926          * 5. Pre-process any special events before delivery
4927          */
4928         switch(id) {
4929             // Handling of the PAINT and UPDATE events is now done in the
4930             // peer's handleEvent() method so the background can be cleared
4931             // selectively for non-native components on Windows only.
4932             // - Fred.Ecks@Eng.sun.com, 5-8-98
4933 
4934           case KeyEvent.KEY_PRESSED:
4935           case KeyEvent.KEY_RELEASED:
4936               Container p = (Container)((this instanceof Container) ? this : parent);
4937               if (p != null) {
4938                   p.preProcessKeyEvent((KeyEvent)e);
4939                   if (e.isConsumed()) {
4940                         if (focusLog.isLoggable(PlatformLogger.Level.FINEST)) {
4941                             focusLog.finest("Pre-process consumed event");
4942                         }
4943                       return;
4944                   }
4945               }
4946               break;
4947 
4948           default:
4949               break;
4950         }
4951 
4952         /*
4953          * 6. Deliver event for normal processing
4954          */
4955         if (newEventsOnly) {
4956             // Filtering needs to really be moved to happen at a lower
4957             // level in order to get maximum performance gain;  it is
4958             // here temporarily to ensure the API spec is honored.
4959             //
4960             if (eventEnabled(e)) {
4961                 processEvent(e);
4962             }
4963         } else if (id == MouseEvent.MOUSE_WHEEL) {
4964             // newEventsOnly will be false for a listenerless ScrollPane, but
4965             // MouseWheelEvents still need to be dispatched to it so scrolling
4966             // can be done.
4967             autoProcessMouseWheel((MouseWheelEvent)e);
4968         } else if (!(e instanceof MouseEvent && !postsOldMouseEvents())) {
4969             //
4970             // backward compatibility
4971             //
4972             Event olde = e.convertToOld();
4973             if (olde != null) {
4974                 int key = olde.key;
4975                 int modifiers = olde.modifiers;
4976 
4977                 postEvent(olde);
4978                 if (olde.isConsumed()) {
4979                     e.consume();
4980                 }
4981                 // if target changed key or modifier values, copy them
4982                 // back to original event
4983                 //
4984                 switch(olde.id) {
4985                   case Event.KEY_PRESS:
4986                   case Event.KEY_RELEASE:
4987                   case Event.KEY_ACTION:
4988                   case Event.KEY_ACTION_RELEASE:
4989                       if (olde.key != key) {
4990                           ((KeyEvent)e).setKeyChar(olde.getKeyEventChar());
4991                       }
4992                       if (olde.modifiers != modifiers) {
4993                           ((KeyEvent)e).setModifiers(olde.modifiers);
4994                       }
4995                       break;
4996                   default:
4997                       break;
4998                 }
4999             }
5000         }
5001 
5002         /*
5003          * 9. Allow the peer to process the event.
5004          * Except KeyEvents, they will be processed by peer after
5005          * all KeyEventPostProcessors
5006          * (see DefaultKeyboardFocusManager.dispatchKeyEvent())
5007          */
5008         if (!(e instanceof KeyEvent)) {
5009             ComponentPeer tpeer = peer;
5010             if (e instanceof FocusEvent && (tpeer == null || tpeer instanceof LightweightPeer)) {
5011                 // if focus owner is lightweight then its native container
5012                 // processes event
5013                 Component source = (Component)e.getSource();
5014                 if (source != null) {
5015                     Container target = source.getNativeContainer();
5016                     if (target != null) {
5017                         tpeer = target.peer;
5018                     }
5019                 }
5020             }
5021             if (tpeer != null) {
5022                 tpeer.handleEvent(e);
5023             }
5024         }
5025     } // dispatchEventImpl()
5026 
5027     /*
5028      * If newEventsOnly is false, method is called so that ScrollPane can
5029      * override it and handle common-case mouse wheel scrolling.  NOP
5030      * for Component.
5031      */
5032     void autoProcessMouseWheel(MouseWheelEvent e) {}
5033 
5034     /*
5035      * Dispatch given MouseWheelEvent to the first ancestor for which
5036      * MouseWheelEvents are enabled.
5037      *
5038      * Returns whether or not event was dispatched to an ancestor
5039      */
5040     @SuppressWarnings("deprecation")
5041     boolean dispatchMouseWheelToAncestor(MouseWheelEvent e) {
5042         int newX, newY;
5043         newX = e.getX() + getX(); // Coordinates take into account at least
5044         newY = e.getY() + getY(); // the cursor's position relative to this
5045                                   // Component (e.getX()), and this Component's
5046                                   // position relative to its parent.
5047         MouseWheelEvent newMWE;
5048 
5049         if (eventLog.isLoggable(PlatformLogger.Level.FINEST)) {
5050             eventLog.finest("dispatchMouseWheelToAncestor");
5051             eventLog.finest("orig event src is of " + e.getSource().getClass());
5052         }
5053 
5054         /* parent field for Window refers to the owning Window.
5055          * MouseWheelEvents should NOT be propagated into owning Windows
5056          */
5057         synchronized (getTreeLock()) {
5058             Container anc = getParent();
5059             while (anc != null && !anc.eventEnabled(e)) {
5060                 // fix coordinates to be relative to new event source
5061                 newX += anc.getX();
5062                 newY += anc.getY();
5063 
5064                 if (!(anc instanceof Window)) {
5065                     anc = anc.getParent();
5066                 }
5067                 else {
5068                     break;
5069                 }
5070             }
5071 
5072             if (eventLog.isLoggable(PlatformLogger.Level.FINEST)) {
5073                 eventLog.finest("new event src is " + anc.getClass());
5074             }
5075 
5076             if (anc != null && anc.eventEnabled(e)) {
5077                 // Change event to be from new source, with new x,y
5078                 // For now, just create a new event - yucky
5079 
5080                 newMWE = new MouseWheelEvent(anc, // new source
5081                                              e.getID(),
5082                                              e.getWhen(),
5083                                              e.getModifiers(),
5084                                              newX, // x relative to new source
5085                                              newY, // y relative to new source
5086                                              e.getXOnScreen(),
5087                                              e.getYOnScreen(),
5088                                              e.getClickCount(),
5089                                              e.isPopupTrigger(),
5090                                              e.getScrollType(),
5091                                              e.getScrollAmount(),
5092                                              e.getWheelRotation(),
5093                                              e.getPreciseWheelRotation());
5094                 ((AWTEvent)e).copyPrivateDataInto(newMWE);
5095                 // When dispatching a wheel event to
5096                 // ancestor, there is no need trying to find descendant
5097                 // lightweights to dispatch event to.
5098                 // If we dispatch the event to toplevel ancestor,
5099                 // this could enclose the loop: 6480024.
5100                 anc.dispatchEventToSelf(newMWE);
5101                 if (newMWE.isConsumed()) {
5102                     e.consume();
5103                 }
5104                 return true;
5105             }
5106         }
5107         return false;
5108     }
5109 
5110     boolean areInputMethodsEnabled() {
5111         // in 1.2, we assume input method support is required for all
5112         // components that handle key events, but components can turn off
5113         // input methods by calling enableInputMethods(false).
5114         return ((eventMask & AWTEvent.INPUT_METHODS_ENABLED_MASK) != 0) &&
5115             ((eventMask & AWTEvent.KEY_EVENT_MASK) != 0 || keyListener != null);
5116     }
5117 
5118     // REMIND: remove when filtering is handled at lower level
5119     boolean eventEnabled(AWTEvent e) {
5120         return eventTypeEnabled(e.id);
5121     }
5122 
5123     boolean eventTypeEnabled(int type) {
5124         switch(type) {
5125           case ComponentEvent.COMPONENT_MOVED:
5126           case ComponentEvent.COMPONENT_RESIZED:
5127           case ComponentEvent.COMPONENT_SHOWN:
5128           case ComponentEvent.COMPONENT_HIDDEN:
5129               if ((eventMask & AWTEvent.COMPONENT_EVENT_MASK) != 0 ||
5130                   componentListener != null) {
5131                   return true;
5132               }
5133               break;
5134           case FocusEvent.FOCUS_GAINED:
5135           case FocusEvent.FOCUS_LOST:
5136               if ((eventMask & AWTEvent.FOCUS_EVENT_MASK) != 0 ||
5137                   focusListener != null) {
5138                   return true;
5139               }
5140               break;
5141           case KeyEvent.KEY_PRESSED:
5142           case KeyEvent.KEY_RELEASED:
5143           case KeyEvent.KEY_TYPED:
5144               if ((eventMask & AWTEvent.KEY_EVENT_MASK) != 0 ||
5145                   keyListener != null) {
5146                   return true;
5147               }
5148               break;
5149           case MouseEvent.MOUSE_PRESSED:
5150           case MouseEvent.MOUSE_RELEASED:
5151           case MouseEvent.MOUSE_ENTERED:
5152           case MouseEvent.MOUSE_EXITED:
5153           case MouseEvent.MOUSE_CLICKED:
5154               if ((eventMask & AWTEvent.MOUSE_EVENT_MASK) != 0 ||
5155                   mouseListener != null) {
5156                   return true;
5157               }
5158               break;
5159           case MouseEvent.MOUSE_MOVED:
5160           case MouseEvent.MOUSE_DRAGGED:
5161               if ((eventMask & AWTEvent.MOUSE_MOTION_EVENT_MASK) != 0 ||
5162                   mouseMotionListener != null) {
5163                   return true;
5164               }
5165               break;
5166           case MouseEvent.MOUSE_WHEEL:
5167               if ((eventMask & AWTEvent.MOUSE_WHEEL_EVENT_MASK) != 0 ||
5168                   mouseWheelListener != null) {
5169                   return true;
5170               }
5171               break;
5172           case InputMethodEvent.INPUT_METHOD_TEXT_CHANGED:
5173           case InputMethodEvent.CARET_POSITION_CHANGED:
5174               if ((eventMask & AWTEvent.INPUT_METHOD_EVENT_MASK) != 0 ||
5175                   inputMethodListener != null) {
5176                   return true;
5177               }
5178               break;
5179           case HierarchyEvent.HIERARCHY_CHANGED:
5180               if ((eventMask & AWTEvent.HIERARCHY_EVENT_MASK) != 0 ||
5181                   hierarchyListener != null) {
5182                   return true;
5183               }
5184               break;
5185           case HierarchyEvent.ANCESTOR_MOVED:
5186           case HierarchyEvent.ANCESTOR_RESIZED:
5187               if ((eventMask & AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK) != 0 ||
5188                   hierarchyBoundsListener != null) {
5189                   return true;
5190               }
5191               break;
5192           case ActionEvent.ACTION_PERFORMED:
5193               if ((eventMask & AWTEvent.ACTION_EVENT_MASK) != 0) {
5194                   return true;
5195               }
5196               break;
5197           case TextEvent.TEXT_VALUE_CHANGED:
5198               if ((eventMask & AWTEvent.TEXT_EVENT_MASK) != 0) {
5199                   return true;
5200               }
5201               break;
5202           case ItemEvent.ITEM_STATE_CHANGED:
5203               if ((eventMask & AWTEvent.ITEM_EVENT_MASK) != 0) {
5204                   return true;
5205               }
5206               break;
5207           case AdjustmentEvent.ADJUSTMENT_VALUE_CHANGED:
5208               if ((eventMask & AWTEvent.ADJUSTMENT_EVENT_MASK) != 0) {
5209                   return true;
5210               }
5211               break;
5212           default:
5213               break;
5214         }
5215         //
5216         // Always pass on events defined by external programs.
5217         //
5218         if (type > AWTEvent.RESERVED_ID_MAX) {
5219             return true;
5220         }
5221         return false;
5222     }
5223 
5224     /**
5225      * @deprecated As of JDK version 1.1,
5226      * replaced by dispatchEvent(AWTEvent).
5227      */
5228     @Deprecated
5229     public boolean postEvent(Event e) {
5230         ComponentPeer peer = this.peer;
5231 
5232         if (handleEvent(e)) {
5233             e.consume();
5234             return true;
5235         }
5236 
5237         Component parent = this.parent;
5238         int eventx = e.x;
5239         int eventy = e.y;
5240         if (parent != null) {
5241             e.translate(x, y);
5242             if (parent.postEvent(e)) {
5243                 e.consume();
5244                 return true;
5245             }
5246             // restore coords
5247             e.x = eventx;
5248             e.y = eventy;
5249         }
5250         return false;
5251     }
5252 
5253     // Event source interfaces
5254 
5255     /**
5256      * Adds the specified component listener to receive component events from
5257      * this component.
5258      * If listener {@code l} is {@code null},
5259      * no exception is thrown and no action is performed.
5260      * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
5261      * >AWT Threading Issues</a> for details on AWT's threading model.
5262      *
5263      * @param    l   the component listener
5264      * @see      java.awt.event.ComponentEvent
5265      * @see      java.awt.event.ComponentListener
5266      * @see      #removeComponentListener
5267      * @see      #getComponentListeners
5268      * @since    1.1
5269      */
5270     public synchronized void addComponentListener(ComponentListener l) {
5271         if (l == null) {
5272             return;
5273         }
5274         componentListener = AWTEventMulticaster.add(componentListener, l);
5275         newEventsOnly = true;
5276     }
5277 
5278     /**
5279      * Removes the specified component listener so that it no longer
5280      * receives component events from this component. This method performs
5281      * no function, nor does it throw an exception, if the listener
5282      * specified by the argument was not previously added to this component.
5283      * If listener {@code l} is {@code null},
5284      * no exception is thrown and no action is performed.
5285      * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
5286      * >AWT Threading Issues</a> for details on AWT's threading model.
5287      * @param    l   the component listener
5288      * @see      java.awt.event.ComponentEvent
5289      * @see      java.awt.event.ComponentListener
5290      * @see      #addComponentListener
5291      * @see      #getComponentListeners
5292      * @since    1.1
5293      */
5294     public synchronized void removeComponentListener(ComponentListener l) {
5295         if (l == null) {
5296             return;
5297         }
5298         componentListener = AWTEventMulticaster.remove(componentListener, l);
5299     }
5300 
5301     /**
5302      * Returns an array of all the component listeners
5303      * registered on this component.
5304      *
5305      * @return all {@code ComponentListener}s of this component
5306      *         or an empty array if no component
5307      *         listeners are currently registered
5308      *
5309      * @see #addComponentListener
5310      * @see #removeComponentListener
5311      * @since 1.4
5312      */
5313     public synchronized ComponentListener[] getComponentListeners() {
5314         return getListeners(ComponentListener.class);
5315     }
5316 
5317     /**
5318      * Adds the specified focus listener to receive focus events from
5319      * this component when this component gains input focus.
5320      * If listener {@code l} is {@code null},
5321      * no exception is thrown and no action is performed.
5322      * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
5323      * >AWT Threading Issues</a> for details on AWT's threading model.
5324      *
5325      * @param    l   the focus listener
5326      * @see      java.awt.event.FocusEvent
5327      * @see      java.awt.event.FocusListener
5328      * @see      #removeFocusListener
5329      * @see      #getFocusListeners
5330      * @since    1.1
5331      */
5332     public synchronized void addFocusListener(FocusListener l) {
5333         if (l == null) {
5334             return;
5335         }
5336         focusListener = AWTEventMulticaster.add(focusListener, l);
5337         newEventsOnly = true;
5338 
5339         // if this is a lightweight component, enable focus events
5340         // in the native container.
5341         if (peer instanceof LightweightPeer) {
5342             parent.proxyEnableEvents(AWTEvent.FOCUS_EVENT_MASK);
5343         }
5344     }
5345 
5346     /**
5347      * Removes the specified focus listener so that it no longer
5348      * receives focus events from this component. This method performs
5349      * no function, nor does it throw an exception, if the listener
5350      * specified by the argument was not previously added to this component.
5351      * If listener {@code l} is {@code null},
5352      * no exception is thrown and no action is performed.
5353      * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
5354      * >AWT Threading Issues</a> for details on AWT's threading model.
5355      *
5356      * @param    l   the focus listener
5357      * @see      java.awt.event.FocusEvent
5358      * @see      java.awt.event.FocusListener
5359      * @see      #addFocusListener
5360      * @see      #getFocusListeners
5361      * @since    1.1
5362      */
5363     public synchronized void removeFocusListener(FocusListener l) {
5364         if (l == null) {
5365             return;
5366         }
5367         focusListener = AWTEventMulticaster.remove(focusListener, l);
5368     }
5369 
5370     /**
5371      * Returns an array of all the focus listeners
5372      * registered on this component.
5373      *
5374      * @return all of this component's {@code FocusListener}s
5375      *         or an empty array if no component
5376      *         listeners are currently registered
5377      *
5378      * @see #addFocusListener
5379      * @see #removeFocusListener
5380      * @since 1.4
5381      */
5382     public synchronized FocusListener[] getFocusListeners() {
5383         return getListeners(FocusListener.class);
5384     }
5385 
5386     /**
5387      * Adds the specified hierarchy listener to receive hierarchy changed
5388      * events from this component when the hierarchy to which this container
5389      * belongs changes.
5390      * If listener {@code l} is {@code null},
5391      * no exception is thrown and no action is performed.
5392      * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
5393      * >AWT Threading Issues</a> for details on AWT's threading model.
5394      *
5395      * @param    l   the hierarchy listener
5396      * @see      java.awt.event.HierarchyEvent
5397      * @see      java.awt.event.HierarchyListener
5398      * @see      #removeHierarchyListener
5399      * @see      #getHierarchyListeners
5400      * @since    1.3
5401      */
5402     public void addHierarchyListener(HierarchyListener l) {
5403         if (l == null) {
5404             return;
5405         }
5406         boolean notifyAncestors;
5407         synchronized (this) {
5408             notifyAncestors =
5409                 (hierarchyListener == null &&
5410                  (eventMask & AWTEvent.HIERARCHY_EVENT_MASK) == 0);
5411             hierarchyListener = AWTEventMulticaster.add(hierarchyListener, l);
5412             notifyAncestors = (notifyAncestors && hierarchyListener != null);
5413             newEventsOnly = true;
5414         }
5415         if (notifyAncestors) {
5416             synchronized (getTreeLock()) {
5417                 adjustListeningChildrenOnParent(AWTEvent.HIERARCHY_EVENT_MASK,
5418                                                 1);
5419             }
5420         }
5421     }
5422 
5423     /**
5424      * Removes the specified hierarchy listener so that it no longer
5425      * receives hierarchy changed events from this component. This method
5426      * performs no function, nor does it throw an exception, if the listener
5427      * specified by the argument was not previously added to this component.
5428      * If listener {@code l} is {@code null},
5429      * no exception is thrown and no action is performed.
5430      * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
5431      * >AWT Threading Issues</a> for details on AWT's threading model.
5432      *
5433      * @param    l   the hierarchy listener
5434      * @see      java.awt.event.HierarchyEvent
5435      * @see      java.awt.event.HierarchyListener
5436      * @see      #addHierarchyListener
5437      * @see      #getHierarchyListeners
5438      * @since    1.3
5439      */
5440     public void removeHierarchyListener(HierarchyListener l) {
5441         if (l == null) {
5442             return;
5443         }
5444         boolean notifyAncestors;
5445         synchronized (this) {
5446             notifyAncestors =
5447                 (hierarchyListener != null &&
5448                  (eventMask & AWTEvent.HIERARCHY_EVENT_MASK) == 0);
5449             hierarchyListener =
5450                 AWTEventMulticaster.remove(hierarchyListener, l);
5451             notifyAncestors = (notifyAncestors && hierarchyListener == null);
5452         }
5453         if (notifyAncestors) {
5454             synchronized (getTreeLock()) {
5455                 adjustListeningChildrenOnParent(AWTEvent.HIERARCHY_EVENT_MASK,
5456                                                 -1);
5457             }
5458         }
5459     }
5460 
5461     /**
5462      * Returns an array of all the hierarchy listeners
5463      * registered on this component.
5464      *
5465      * @return all of this component's {@code HierarchyListener}s
5466      *         or an empty array if no hierarchy
5467      *         listeners are currently registered
5468      *
5469      * @see      #addHierarchyListener
5470      * @see      #removeHierarchyListener
5471      * @since    1.4
5472      */
5473     public synchronized HierarchyListener[] getHierarchyListeners() {
5474         return getListeners(HierarchyListener.class);
5475     }
5476 
5477     /**
5478      * Adds the specified hierarchy bounds listener to receive hierarchy
5479      * bounds events from this component when the hierarchy to which this
5480      * container belongs changes.
5481      * If listener {@code l} is {@code null},
5482      * no exception is thrown and no action is performed.
5483      * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
5484      * >AWT Threading Issues</a> for details on AWT's threading model.
5485      *
5486      * @param    l   the hierarchy bounds listener
5487      * @see      java.awt.event.HierarchyEvent
5488      * @see      java.awt.event.HierarchyBoundsListener
5489      * @see      #removeHierarchyBoundsListener
5490      * @see      #getHierarchyBoundsListeners
5491      * @since    1.3
5492      */
5493     public void addHierarchyBoundsListener(HierarchyBoundsListener l) {
5494         if (l == null) {
5495             return;
5496         }
5497         boolean notifyAncestors;
5498         synchronized (this) {
5499             notifyAncestors =
5500                 (hierarchyBoundsListener == null &&
5501                  (eventMask & AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK) == 0);
5502             hierarchyBoundsListener =
5503                 AWTEventMulticaster.add(hierarchyBoundsListener, l);
5504             notifyAncestors = (notifyAncestors &&
5505                                hierarchyBoundsListener != null);
5506             newEventsOnly = true;
5507         }
5508         if (notifyAncestors) {
5509             synchronized (getTreeLock()) {
5510                 adjustListeningChildrenOnParent(
5511                                                 AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK, 1);
5512             }
5513         }
5514     }
5515 
5516     /**
5517      * Removes the specified hierarchy bounds listener so that it no longer
5518      * receives hierarchy bounds events from this component. This method
5519      * performs no function, nor does it throw an exception, if the listener
5520      * specified by the argument was not previously added to this component.
5521      * If listener {@code l} is {@code null},
5522      * no exception is thrown and no action is performed.
5523      * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
5524      * >AWT Threading Issues</a> for details on AWT's threading model.
5525      *
5526      * @param    l   the hierarchy bounds listener
5527      * @see      java.awt.event.HierarchyEvent
5528      * @see      java.awt.event.HierarchyBoundsListener
5529      * @see      #addHierarchyBoundsListener
5530      * @see      #getHierarchyBoundsListeners
5531      * @since    1.3
5532      */
5533     public void removeHierarchyBoundsListener(HierarchyBoundsListener l) {
5534         if (l == null) {
5535             return;
5536         }
5537         boolean notifyAncestors;
5538         synchronized (this) {
5539             notifyAncestors =
5540                 (hierarchyBoundsListener != null &&
5541                  (eventMask & AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK) == 0);
5542             hierarchyBoundsListener =
5543                 AWTEventMulticaster.remove(hierarchyBoundsListener, l);
5544             notifyAncestors = (notifyAncestors &&
5545                                hierarchyBoundsListener == null);
5546         }
5547         if (notifyAncestors) {
5548             synchronized (getTreeLock()) {
5549                 adjustListeningChildrenOnParent(
5550                                                 AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK, -1);
5551             }
5552         }
5553     }
5554 
5555     // Should only be called while holding the tree lock
5556     int numListening(long mask) {
5557         // One mask or the other, but not neither or both.
5558         if (eventLog.isLoggable(PlatformLogger.Level.FINE)) {
5559             if ((mask != AWTEvent.HIERARCHY_EVENT_MASK) &&
5560                 (mask != AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK))
5561             {
5562                 eventLog.fine("Assertion failed");
5563             }
5564         }
5565         if ((mask == AWTEvent.HIERARCHY_EVENT_MASK &&
5566              (hierarchyListener != null ||
5567               (eventMask & AWTEvent.HIERARCHY_EVENT_MASK) != 0)) ||
5568             (mask == AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK &&
5569              (hierarchyBoundsListener != null ||
5570               (eventMask & AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK) != 0))) {
5571             return 1;
5572         } else {
5573             return 0;
5574         }
5575     }
5576 
5577     // Should only be called while holding tree lock
5578     int countHierarchyMembers() {
5579         return 1;
5580     }
5581     // Should only be called while holding the tree lock
5582     int createHierarchyEvents(int id, Component changed,
5583                               Container changedParent, long changeFlags,
5584                               boolean enabledOnToolkit) {
5585         switch (id) {
5586           case HierarchyEvent.HIERARCHY_CHANGED:
5587               if (hierarchyListener != null ||
5588                   (eventMask & AWTEvent.HIERARCHY_EVENT_MASK) != 0 ||
5589                   enabledOnToolkit) {
5590                   HierarchyEvent e = new HierarchyEvent(this, id, changed,
5591                                                         changedParent,
5592                                                         changeFlags);
5593                   dispatchEvent(e);
5594                   return 1;
5595               }
5596               break;
5597           case HierarchyEvent.ANCESTOR_MOVED:
5598           case HierarchyEvent.ANCESTOR_RESIZED:
5599               if (eventLog.isLoggable(PlatformLogger.Level.FINE)) {
5600                   if (changeFlags != 0) {
5601                       eventLog.fine("Assertion (changeFlags == 0) failed");
5602                   }
5603               }
5604               if (hierarchyBoundsListener != null ||
5605                   (eventMask & AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK) != 0 ||
5606                   enabledOnToolkit) {
5607                   HierarchyEvent e = new HierarchyEvent(this, id, changed,
5608                                                         changedParent);
5609                   dispatchEvent(e);
5610                   return 1;
5611               }
5612               break;
5613           default:
5614               // assert false
5615               if (eventLog.isLoggable(PlatformLogger.Level.FINE)) {
5616                   eventLog.fine("This code must never be reached");
5617               }
5618               break;
5619         }
5620         return 0;
5621     }
5622 
5623     /**
5624      * Returns an array of all the hierarchy bounds listeners
5625      * registered on this component.
5626      *
5627      * @return all of this component's {@code HierarchyBoundsListener}s
5628      *         or an empty array if no hierarchy bounds
5629      *         listeners are currently registered
5630      *
5631      * @see      #addHierarchyBoundsListener
5632      * @see      #removeHierarchyBoundsListener
5633      * @since    1.4
5634      */
5635     public synchronized HierarchyBoundsListener[] getHierarchyBoundsListeners() {
5636         return getListeners(HierarchyBoundsListener.class);
5637     }
5638 
5639     /*
5640      * Should only be called while holding the tree lock.
5641      * It's added only for overriding in java.awt.Window
5642      * because parent in Window is owner.
5643      */
5644     void adjustListeningChildrenOnParent(long mask, int num) {
5645         if (parent != null) {
5646             parent.adjustListeningChildren(mask, num);
5647         }
5648     }
5649 
5650     /**
5651      * Adds the specified key listener to receive key events from
5652      * this component.
5653      * If l is null, no exception is thrown and no action is performed.
5654      * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
5655      * >AWT Threading Issues</a> for details on AWT's threading model.
5656      *
5657      * @param    l   the key listener.
5658      * @see      java.awt.event.KeyEvent
5659      * @see      java.awt.event.KeyListener
5660      * @see      #removeKeyListener
5661      * @see      #getKeyListeners
5662      * @since    1.1
5663      */
5664     public synchronized void addKeyListener(KeyListener l) {
5665         if (l == null) {
5666             return;
5667         }
5668         keyListener = AWTEventMulticaster.add(keyListener, l);
5669         newEventsOnly = true;
5670 
5671         // if this is a lightweight component, enable key events
5672         // in the native container.
5673         if (peer instanceof LightweightPeer) {
5674             parent.proxyEnableEvents(AWTEvent.KEY_EVENT_MASK);
5675         }
5676     }
5677 
5678     /**
5679      * Removes the specified key listener so that it no longer
5680      * receives key events from this component. This method performs
5681      * no function, nor does it throw an exception, if the listener
5682      * specified by the argument was not previously added to this component.
5683      * If listener {@code l} is {@code null},
5684      * no exception is thrown and no action is performed.
5685      * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
5686      * >AWT Threading Issues</a> for details on AWT's threading model.
5687      *
5688      * @param    l   the key listener
5689      * @see      java.awt.event.KeyEvent
5690      * @see      java.awt.event.KeyListener
5691      * @see      #addKeyListener
5692      * @see      #getKeyListeners
5693      * @since    1.1
5694      */
5695     public synchronized void removeKeyListener(KeyListener l) {
5696         if (l == null) {
5697             return;
5698         }
5699         keyListener = AWTEventMulticaster.remove(keyListener, l);
5700     }
5701 
5702     /**
5703      * Returns an array of all the key listeners
5704      * registered on this component.
5705      *
5706      * @return all of this component's {@code KeyListener}s
5707      *         or an empty array if no key
5708      *         listeners are currently registered
5709      *
5710      * @see      #addKeyListener
5711      * @see      #removeKeyListener
5712      * @since    1.4
5713      */
5714     public synchronized KeyListener[] getKeyListeners() {
5715         return getListeners(KeyListener.class);
5716     }
5717 
5718     /**
5719      * Adds the specified mouse listener to receive mouse events from
5720      * this component.
5721      * If listener {@code l} is {@code null},
5722      * no exception is thrown and no action is performed.
5723      * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
5724      * >AWT Threading Issues</a> for details on AWT's threading model.
5725      *
5726      * @param    l   the mouse listener
5727      * @see      java.awt.event.MouseEvent
5728      * @see      java.awt.event.MouseListener
5729      * @see      #removeMouseListener
5730      * @see      #getMouseListeners
5731      * @since    1.1
5732      */
5733     public synchronized void addMouseListener(MouseListener l) {
5734         if (l == null) {
5735             return;
5736         }
5737         mouseListener = AWTEventMulticaster.add(mouseListener,l);
5738         newEventsOnly = true;
5739 
5740         // if this is a lightweight component, enable mouse events
5741         // in the native container.
5742         if (peer instanceof LightweightPeer) {
5743             parent.proxyEnableEvents(AWTEvent.MOUSE_EVENT_MASK);
5744         }
5745     }
5746 
5747     /**
5748      * Removes the specified mouse listener so that it no longer
5749      * receives mouse events from this component. This method performs
5750      * no function, nor does it throw an exception, if the listener
5751      * specified by the argument was not previously added to this component.
5752      * If listener {@code l} is {@code null},
5753      * no exception is thrown and no action is performed.
5754      * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
5755      * >AWT Threading Issues</a> for details on AWT's threading model.
5756      *
5757      * @param    l   the mouse listener
5758      * @see      java.awt.event.MouseEvent
5759      * @see      java.awt.event.MouseListener
5760      * @see      #addMouseListener
5761      * @see      #getMouseListeners
5762      * @since    1.1
5763      */
5764     public synchronized void removeMouseListener(MouseListener l) {
5765         if (l == null) {
5766             return;
5767         }
5768         mouseListener = AWTEventMulticaster.remove(mouseListener, l);
5769     }
5770 
5771     /**
5772      * Returns an array of all the mouse listeners
5773      * registered on this component.
5774      *
5775      * @return all of this component's {@code MouseListener}s
5776      *         or an empty array if no mouse
5777      *         listeners are currently registered
5778      *
5779      * @see      #addMouseListener
5780      * @see      #removeMouseListener
5781      * @since    1.4
5782      */
5783     public synchronized MouseListener[] getMouseListeners() {
5784         return getListeners(MouseListener.class);
5785     }
5786 
5787     /**
5788      * Adds the specified mouse motion listener to receive mouse motion
5789      * events from this component.
5790      * If listener {@code l} is {@code null},
5791      * no exception is thrown and no action is performed.
5792      * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
5793      * >AWT Threading Issues</a> for details on AWT's threading model.
5794      *
5795      * @param    l   the mouse motion listener
5796      * @see      java.awt.event.MouseEvent
5797      * @see      java.awt.event.MouseMotionListener
5798      * @see      #removeMouseMotionListener
5799      * @see      #getMouseMotionListeners
5800      * @since    1.1
5801      */
5802     public synchronized void addMouseMotionListener(MouseMotionListener l) {
5803         if (l == null) {
5804             return;
5805         }
5806         mouseMotionListener = AWTEventMulticaster.add(mouseMotionListener,l);
5807         newEventsOnly = true;
5808 
5809         // if this is a lightweight component, enable mouse events
5810         // in the native container.
5811         if (peer instanceof LightweightPeer) {
5812             parent.proxyEnableEvents(AWTEvent.MOUSE_MOTION_EVENT_MASK);
5813         }
5814     }
5815 
5816     /**
5817      * Removes the specified mouse motion listener so that it no longer
5818      * receives mouse motion events from this component. This method performs
5819      * no function, nor does it throw an exception, if the listener
5820      * specified by the argument was not previously added to this component.
5821      * If listener {@code l} is {@code null},
5822      * no exception is thrown and no action is performed.
5823      * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
5824      * >AWT Threading Issues</a> for details on AWT's threading model.
5825      *
5826      * @param    l   the mouse motion listener
5827      * @see      java.awt.event.MouseEvent
5828      * @see      java.awt.event.MouseMotionListener
5829      * @see      #addMouseMotionListener
5830      * @see      #getMouseMotionListeners
5831      * @since    1.1
5832      */
5833     public synchronized void removeMouseMotionListener(MouseMotionListener l) {
5834         if (l == null) {
5835             return;
5836         }
5837         mouseMotionListener = AWTEventMulticaster.remove(mouseMotionListener, l);
5838     }
5839 
5840     /**
5841      * Returns an array of all the mouse motion listeners
5842      * registered on this component.
5843      *
5844      * @return all of this component's {@code MouseMotionListener}s
5845      *         or an empty array if no mouse motion
5846      *         listeners are currently registered
5847      *
5848      * @see      #addMouseMotionListener
5849      * @see      #removeMouseMotionListener
5850      * @since    1.4
5851      */
5852     public synchronized MouseMotionListener[] getMouseMotionListeners() {
5853         return getListeners(MouseMotionListener.class);
5854     }
5855 
5856     /**
5857      * Adds the specified mouse wheel listener to receive mouse wheel events
5858      * from this component.  Containers also receive mouse wheel events from
5859      * sub-components.
5860      * <p>
5861      * For information on how mouse wheel events are dispatched, see
5862      * the class description for {@link MouseWheelEvent}.
5863      * <p>
5864      * If l is {@code null}, no exception is thrown and no
5865      * action is performed.
5866      * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
5867      * >AWT Threading Issues</a> for details on AWT's threading model.
5868      *
5869      * @param    l   the mouse wheel listener
5870      * @see      java.awt.event.MouseWheelEvent
5871      * @see      java.awt.event.MouseWheelListener
5872      * @see      #removeMouseWheelListener
5873      * @see      #getMouseWheelListeners
5874      * @since    1.4
5875      */
5876     public synchronized void addMouseWheelListener(MouseWheelListener l) {
5877         if (l == null) {
5878             return;
5879         }
5880         mouseWheelListener = AWTEventMulticaster.add(mouseWheelListener,l);
5881         newEventsOnly = true;
5882 
5883         // if this is a lightweight component, enable mouse events
5884         // in the native container.
5885         if (peer instanceof LightweightPeer) {
5886             parent.proxyEnableEvents(AWTEvent.MOUSE_WHEEL_EVENT_MASK);
5887         }
5888     }
5889 
5890     /**
5891      * Removes the specified mouse wheel listener so that it no longer
5892      * receives mouse wheel events from this component. This method performs
5893      * no function, nor does it throw an exception, if the listener
5894      * specified by the argument was not previously added to this component.
5895      * If l is null, no exception is thrown and no action is performed.
5896      * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
5897      * >AWT Threading Issues</a> for details on AWT's threading model.
5898      *
5899      * @param    l   the mouse wheel listener.
5900      * @see      java.awt.event.MouseWheelEvent
5901      * @see      java.awt.event.MouseWheelListener
5902      * @see      #addMouseWheelListener
5903      * @see      #getMouseWheelListeners
5904      * @since    1.4
5905      */
5906     public synchronized void removeMouseWheelListener(MouseWheelListener l) {
5907         if (l == null) {
5908             return;
5909         }
5910         mouseWheelListener = AWTEventMulticaster.remove(mouseWheelListener, l);
5911     }
5912 
5913     /**
5914      * Returns an array of all the mouse wheel listeners
5915      * registered on this component.
5916      *
5917      * @return all of this component's {@code MouseWheelListener}s
5918      *         or an empty array if no mouse wheel
5919      *         listeners are currently registered
5920      *
5921      * @see      #addMouseWheelListener
5922      * @see      #removeMouseWheelListener
5923      * @since    1.4
5924      */
5925     public synchronized MouseWheelListener[] getMouseWheelListeners() {
5926         return getListeners(MouseWheelListener.class);
5927     }
5928 
5929     /**
5930      * Adds the specified input method listener to receive
5931      * input method events from this component. A component will
5932      * only receive input method events from input methods
5933      * if it also overrides {@code getInputMethodRequests} to return an
5934      * {@code InputMethodRequests} instance.
5935      * If listener {@code l} is {@code null},
5936      * no exception is thrown and no action is performed.
5937      * <p>Refer to <a href="{@docRoot}/java/awt/doc-files/AWTThreadIssues.html#ListenersThreads"
5938      * >AWT Threading Issues</a> for details on AWT's threading model.
5939      *
5940      * @param    l   the input method listener
5941      * @see      java.awt.event.InputMethodEvent
5942      * @see      java.awt.event.InputMethodListener
5943      * @see      #removeInputMethodListener
5944      * @see      #getInputMethodListeners
5945      * @see      #getInputMethodRequests
5946      * @since    1.2
5947      */
5948     public synchronized void addInputMethodListener(InputMethodListener l) {
5949         if (l == null) {
5950             return;
5951         }
5952         inputMethodListener = AWTEventMulticaster.add(inputMethodListener, l);
5953         newEventsOnly = true;
5954     }
5955 
5956     /**
5957      * Removes the specified input method listener so that it no longer
5958      * receives input method events from this component. This method performs
5959      * no function, nor does it throw an exception, if the listener
5960      * specified by the argument was not previously added to this component.
5961      * If listener {@code l} is {@code null},
5962      * no exception is thrown and no action is performed.
5963      * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
5964      * >AWT Threading Issues</a> for details on AWT's threading model.
5965      *
5966      * @param    l   the input method listener
5967      * @see      java.awt.event.InputMethodEvent
5968      * @see      java.awt.event.InputMethodListener
5969      * @see      #addInputMethodListener
5970      * @see      #getInputMethodListeners
5971      * @since    1.2
5972      */
5973     public synchronized void removeInputMethodListener(InputMethodListener l) {
5974         if (l == null) {
5975             return;
5976         }
5977         inputMethodListener = AWTEventMulticaster.remove(inputMethodListener, l);
5978     }
5979 
5980     /**
5981      * Returns an array of all the input method listeners
5982      * registered on this component.
5983      *
5984      * @return all of this component's {@code InputMethodListener}s
5985      *         or an empty array if no input method
5986      *         listeners are currently registered
5987      *
5988      * @see      #addInputMethodListener
5989      * @see      #removeInputMethodListener
5990      * @since    1.4
5991      */
5992     public synchronized InputMethodListener[] getInputMethodListeners() {
5993         return getListeners(InputMethodListener.class);
5994     }
5995 
5996     /**
5997      * Returns an array of all the objects currently registered
5998      * as <code><em>Foo</em>Listener</code>s
5999      * upon this {@code Component}.
6000      * <code><em>Foo</em>Listener</code>s are registered using the
6001      * <code>add<em>Foo</em>Listener</code> method.
6002      *
6003      * <p>
6004      * You can specify the {@code listenerType} argument
6005      * with a class literal, such as
6006      * <code><em>Foo</em>Listener.class</code>.
6007      * For example, you can query a
6008      * {@code Component c}
6009      * for its mouse listeners with the following code:
6010      *
6011      * <pre>MouseListener[] mls = (MouseListener[])(c.getListeners(MouseListener.class));</pre>
6012      *
6013      * If no such listeners exist, this method returns an empty array.
6014      *
6015      * @param <T> the type of the listeners
6016      * @param listenerType the type of listeners requested; this parameter
6017      *          should specify an interface that descends from
6018      *          {@code java.util.EventListener}
6019      * @return an array of all objects registered as
6020      *          <code><em>Foo</em>Listener</code>s on this component,
6021      *          or an empty array if no such listeners have been added
6022      * @exception ClassCastException if {@code listenerType}
6023      *          doesn't specify a class or interface that implements
6024      *          {@code java.util.EventListener}
6025      * @throws NullPointerException if {@code listenerType} is {@code null}
6026      * @see #getComponentListeners
6027      * @see #getFocusListeners
6028      * @see #getHierarchyListeners
6029      * @see #getHierarchyBoundsListeners
6030      * @see #getKeyListeners
6031      * @see #getMouseListeners
6032      * @see #getMouseMotionListeners
6033      * @see #getMouseWheelListeners
6034      * @see #getInputMethodListeners
6035      * @see #getPropertyChangeListeners
6036      *
6037      * @since 1.3
6038      */
6039     @SuppressWarnings("unchecked")
6040     public <T extends EventListener> T[] getListeners(Class<T> listenerType) {
6041         EventListener l = null;
6042         if  (listenerType == ComponentListener.class) {
6043             l = componentListener;
6044         } else if (listenerType == FocusListener.class) {
6045             l = focusListener;
6046         } else if (listenerType == HierarchyListener.class) {
6047             l = hierarchyListener;
6048         } else if (listenerType == HierarchyBoundsListener.class) {
6049             l = hierarchyBoundsListener;
6050         } else if (listenerType == KeyListener.class) {
6051             l = keyListener;
6052         } else if (listenerType == MouseListener.class) {
6053             l = mouseListener;
6054         } else if (listenerType == MouseMotionListener.class) {
6055             l = mouseMotionListener;
6056         } else if (listenerType == MouseWheelListener.class) {
6057             l = mouseWheelListener;
6058         } else if (listenerType == InputMethodListener.class) {
6059             l = inputMethodListener;
6060         } else if (listenerType == PropertyChangeListener.class) {
6061             return (T[])getPropertyChangeListeners();
6062         }
6063         return AWTEventMulticaster.getListeners(l, listenerType);
6064     }
6065 
6066     /**
6067      * Gets the input method request handler which supports
6068      * requests from input methods for this component. A component
6069      * that supports on-the-spot text input must override this
6070      * method to return an {@code InputMethodRequests} instance.
6071      * At the same time, it also has to handle input method events.
6072      *
6073      * @return the input method request handler for this component,
6074      *          {@code null} by default
6075      * @see #addInputMethodListener
6076      * @since 1.2
6077      */
6078     public InputMethodRequests getInputMethodRequests() {
6079         return null;
6080     }
6081 
6082     /**
6083      * Gets the input context used by this component for handling
6084      * the communication with input methods when text is entered
6085      * in this component. By default, the input context used for
6086      * the parent component is returned. Components may
6087      * override this to return a private input context.
6088      *
6089      * @return the input context used by this component;
6090      *          {@code null} if no context can be determined
6091      * @since 1.2
6092      */
6093     public InputContext getInputContext() {
6094         Container parent = this.parent;
6095         if (parent == null) {
6096             return null;
6097         } else {
6098             return parent.getInputContext();
6099         }
6100     }
6101 
6102     /**
6103      * Enables the events defined by the specified event mask parameter
6104      * to be delivered to this component.
6105      * <p>
6106      * Event types are automatically enabled when a listener for
6107      * that event type is added to the component.
6108      * <p>
6109      * This method only needs to be invoked by subclasses of
6110      * {@code Component} which desire to have the specified event
6111      * types delivered to {@code processEvent} regardless of whether
6112      * or not a listener is registered.
6113      * @param      eventsToEnable   the event mask defining the event types
6114      * @see        #processEvent
6115      * @see        #disableEvents
6116      * @see        AWTEvent
6117      * @since      1.1
6118      */
6119     protected final void enableEvents(long eventsToEnable) {
6120         long notifyAncestors = 0;
6121         synchronized (this) {
6122             if ((eventsToEnable & AWTEvent.HIERARCHY_EVENT_MASK) != 0 &&
6123                 hierarchyListener == null &&
6124                 (eventMask & AWTEvent.HIERARCHY_EVENT_MASK) == 0) {
6125                 notifyAncestors |= AWTEvent.HIERARCHY_EVENT_MASK;
6126             }
6127             if ((eventsToEnable & AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK) != 0 &&
6128                 hierarchyBoundsListener == null &&
6129                 (eventMask & AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK) == 0) {
6130                 notifyAncestors |= AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK;
6131             }
6132             eventMask |= eventsToEnable;
6133             newEventsOnly = true;
6134         }
6135 
6136         // if this is a lightweight component, enable mouse events
6137         // in the native container.
6138         if (peer instanceof LightweightPeer) {
6139             parent.proxyEnableEvents(eventMask);
6140         }
6141         if (notifyAncestors != 0) {
6142             synchronized (getTreeLock()) {
6143                 adjustListeningChildrenOnParent(notifyAncestors, 1);
6144             }
6145         }
6146     }
6147 
6148     /**
6149      * Disables the events defined by the specified event mask parameter
6150      * from being delivered to this component.
6151      * @param      eventsToDisable   the event mask defining the event types
6152      * @see        #enableEvents
6153      * @since      1.1
6154      */
6155     protected final void disableEvents(long eventsToDisable) {
6156         long notifyAncestors = 0;
6157         synchronized (this) {
6158             if ((eventsToDisable & AWTEvent.HIERARCHY_EVENT_MASK) != 0 &&
6159                 hierarchyListener == null &&
6160                 (eventMask & AWTEvent.HIERARCHY_EVENT_MASK) != 0) {
6161                 notifyAncestors |= AWTEvent.HIERARCHY_EVENT_MASK;
6162             }
6163             if ((eventsToDisable & AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK)!=0 &&
6164                 hierarchyBoundsListener == null &&
6165                 (eventMask & AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK) != 0) {
6166                 notifyAncestors |= AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK;
6167             }
6168             eventMask &= ~eventsToDisable;
6169         }
6170         if (notifyAncestors != 0) {
6171             synchronized (getTreeLock()) {
6172                 adjustListeningChildrenOnParent(notifyAncestors, -1);
6173             }
6174         }
6175     }
6176 
6177     transient sun.awt.EventQueueItem[] eventCache;
6178 
6179     /**
6180      * @see #isCoalescingEnabled
6181      * @see #checkCoalescing
6182      */
6183     private transient boolean coalescingEnabled = checkCoalescing();
6184 
6185     /**
6186      * Weak map of known coalesceEvent overriders.
6187      * Value indicates whether overriden.
6188      * Bootstrap classes are not included.
6189      */
6190     private static final Map<Class<?>, Boolean> coalesceMap =
6191         new java.util.WeakHashMap<Class<?>, Boolean>();
6192 
6193     /**
6194      * Indicates whether this class overrides coalesceEvents.
6195      * It is assumed that all classes that are loaded from the bootstrap
6196      *   do not.
6197      * The bootstrap class loader is assumed to be represented by null.
6198      * We do not check that the method really overrides
6199      *   (it might be static, private or package private).
6200      */
6201      private boolean checkCoalescing() {
6202          if (getClass().getClassLoader()==null) {
6203              return false;
6204          }
6205          final Class<? extends Component> clazz = getClass();
6206          synchronized (coalesceMap) {
6207              // Check cache.
6208              Boolean value = coalesceMap.get(clazz);
6209              if (value != null) {
6210                  return value;
6211              }
6212 
6213              // Need to check non-bootstraps.
6214              Boolean enabled = java.security.AccessController.doPrivileged(
6215                  new java.security.PrivilegedAction<Boolean>() {
6216                      public Boolean run() {
6217                          return isCoalesceEventsOverriden(clazz);
6218                      }
6219                  }
6220                  );
6221              coalesceMap.put(clazz, enabled);
6222              return enabled;
6223          }
6224      }
6225 
6226     /**
6227      * Parameter types of coalesceEvents(AWTEvent,AWTEVent).
6228      */
6229     private static final Class<?>[] coalesceEventsParams = {
6230         AWTEvent.class, AWTEvent.class
6231     };
6232 
6233     /**
6234      * Indicates whether a class or its superclasses override coalesceEvents.
6235      * Must be called with lock on coalesceMap and privileged.
6236      * @see #checkCoalescing
6237      */
6238     private static boolean isCoalesceEventsOverriden(Class<?> clazz) {
6239         assert Thread.holdsLock(coalesceMap);
6240 
6241         // First check superclass - we may not need to bother ourselves.
6242         Class<?> superclass = clazz.getSuperclass();
6243         if (superclass == null) {
6244             // Only occurs on implementations that
6245             //   do not use null to represent the bootstrap class loader.
6246             return false;
6247         }
6248         if (superclass.getClassLoader() != null) {
6249             Boolean value = coalesceMap.get(superclass);
6250             if (value == null) {
6251                 // Not done already - recurse.
6252                 if (isCoalesceEventsOverriden(superclass)) {
6253                     coalesceMap.put(superclass, true);
6254                     return true;
6255                 }
6256             } else if (value) {
6257                 return true;
6258             }
6259         }
6260 
6261         try {
6262             // Throws if not overriden.
6263             clazz.getDeclaredMethod(
6264                 "coalesceEvents", coalesceEventsParams
6265                 );
6266             return true;
6267         } catch (NoSuchMethodException e) {
6268             // Not present in this class.
6269             return false;
6270         }
6271     }
6272 
6273     /**
6274      * Indicates whether coalesceEvents may do something.
6275      */
6276     final boolean isCoalescingEnabled() {
6277         return coalescingEnabled;
6278      }
6279 
6280 
6281     /**
6282      * Potentially coalesce an event being posted with an existing
6283      * event.  This method is called by {@code EventQueue.postEvent}
6284      * if an event with the same ID as the event to be posted is found in
6285      * the queue (both events must have this component as their source).
6286      * This method either returns a coalesced event which replaces
6287      * the existing event (and the new event is then discarded), or
6288      * {@code null} to indicate that no combining should be done
6289      * (add the second event to the end of the queue).  Either event
6290      * parameter may be modified and returned, as the other one is discarded
6291      * unless {@code null} is returned.
6292      * <p>
6293      * This implementation of {@code coalesceEvents} coalesces
6294      * two event types: mouse move (and drag) events,
6295      * and paint (and update) events.
6296      * For mouse move events the last event is always returned, causing
6297      * intermediate moves to be discarded.  For paint events, the new
6298      * event is coalesced into a complex {@code RepaintArea} in the peer.
6299      * The new {@code AWTEvent} is always returned.
6300      *
6301      * @param  existingEvent  the event already on the {@code EventQueue}
6302      * @param  newEvent       the event being posted to the
6303      *          {@code EventQueue}
6304      * @return a coalesced event, or {@code null} indicating that no
6305      *          coalescing was done
6306      */
6307     protected AWTEvent coalesceEvents(AWTEvent existingEvent,
6308                                       AWTEvent newEvent) {
6309         return null;
6310     }
6311 
6312     /**
6313      * Processes events occurring on this component. By default this
6314      * method calls the appropriate
6315      * <code>process&lt;event&nbsp;type&gt;Event</code>
6316      * method for the given class of event.
6317      * <p>Note that if the event parameter is {@code null}
6318      * the behavior is unspecified and may result in an
6319      * exception.
6320      *
6321      * @param     e the event
6322      * @see       #processComponentEvent
6323      * @see       #processFocusEvent
6324      * @see       #processKeyEvent
6325      * @see       #processMouseEvent
6326      * @see       #processMouseMotionEvent
6327      * @see       #processInputMethodEvent
6328      * @see       #processHierarchyEvent
6329      * @see       #processMouseWheelEvent
6330      * @since     1.1
6331      */
6332     protected void processEvent(AWTEvent e) {
6333         if (e instanceof FocusEvent) {
6334             processFocusEvent((FocusEvent)e);
6335 
6336         } else if (e instanceof MouseEvent) {
6337             switch(e.getID()) {
6338               case MouseEvent.MOUSE_PRESSED:
6339               case MouseEvent.MOUSE_RELEASED:
6340               case MouseEvent.MOUSE_CLICKED:
6341               case MouseEvent.MOUSE_ENTERED:
6342               case MouseEvent.MOUSE_EXITED:
6343                   processMouseEvent((MouseEvent)e);
6344                   break;
6345               case MouseEvent.MOUSE_MOVED:
6346               case MouseEvent.MOUSE_DRAGGED:
6347                   processMouseMotionEvent((MouseEvent)e);
6348                   break;
6349               case MouseEvent.MOUSE_WHEEL:
6350                   processMouseWheelEvent((MouseWheelEvent)e);
6351                   break;
6352             }
6353 
6354         } else if (e instanceof KeyEvent) {
6355             processKeyEvent((KeyEvent)e);
6356 
6357         } else if (e instanceof ComponentEvent) {
6358             processComponentEvent((ComponentEvent)e);
6359         } else if (e instanceof InputMethodEvent) {
6360             processInputMethodEvent((InputMethodEvent)e);
6361         } else if (e instanceof HierarchyEvent) {
6362             switch (e.getID()) {
6363               case HierarchyEvent.HIERARCHY_CHANGED:
6364                   processHierarchyEvent((HierarchyEvent)e);
6365                   break;
6366               case HierarchyEvent.ANCESTOR_MOVED:
6367               case HierarchyEvent.ANCESTOR_RESIZED:
6368                   processHierarchyBoundsEvent((HierarchyEvent)e);
6369                   break;
6370             }
6371         }
6372     }
6373 
6374     /**
6375      * Processes component events occurring on this component by
6376      * dispatching them to any registered
6377      * {@code ComponentListener} objects.
6378      * <p>
6379      * This method is not called unless component events are
6380      * enabled for this component. Component events are enabled
6381      * when one of the following occurs:
6382      * <ul>
6383      * <li>A {@code ComponentListener} object is registered
6384      * via {@code addComponentListener}.
6385      * <li>Component events are enabled via {@code enableEvents}.
6386      * </ul>
6387      * <p>Note that if the event parameter is {@code null}
6388      * the behavior is unspecified and may result in an
6389      * exception.
6390      *
6391      * @param       e the component event
6392      * @see         java.awt.event.ComponentEvent
6393      * @see         java.awt.event.ComponentListener
6394      * @see         #addComponentListener
6395      * @see         #enableEvents
6396      * @since       1.1
6397      */
6398     protected void processComponentEvent(ComponentEvent e) {
6399         ComponentListener listener = componentListener;
6400         if (listener != null) {
6401             int id = e.getID();
6402             switch(id) {
6403               case ComponentEvent.COMPONENT_RESIZED:
6404                   listener.componentResized(e);
6405                   break;
6406               case ComponentEvent.COMPONENT_MOVED:
6407                   listener.componentMoved(e);
6408                   break;
6409               case ComponentEvent.COMPONENT_SHOWN:
6410                   listener.componentShown(e);
6411                   break;
6412               case ComponentEvent.COMPONENT_HIDDEN:
6413                   listener.componentHidden(e);
6414                   break;
6415             }
6416         }
6417     }
6418 
6419     /**
6420      * Processes focus events occurring on this component by
6421      * dispatching them to any registered
6422      * {@code FocusListener} objects.
6423      * <p>
6424      * This method is not called unless focus events are
6425      * enabled for this component. Focus events are enabled
6426      * when one of the following occurs:
6427      * <ul>
6428      * <li>A {@code FocusListener} object is registered
6429      * via {@code addFocusListener}.
6430      * <li>Focus events are enabled via {@code enableEvents}.
6431      * </ul>
6432      * <p>
6433      * If focus events are enabled for a {@code Component},
6434      * the current {@code KeyboardFocusManager} determines
6435      * whether or not a focus event should be dispatched to
6436      * registered {@code FocusListener} objects.  If the
6437      * events are to be dispatched, the {@code KeyboardFocusManager}
6438      * calls the {@code Component}'s {@code dispatchEvent}
6439      * method, which results in a call to the {@code Component}'s
6440      * {@code processFocusEvent} method.
6441      * <p>
6442      * If focus events are enabled for a {@code Component}, calling
6443      * the {@code Component}'s {@code dispatchEvent} method
6444      * with a {@code FocusEvent} as the argument will result in a
6445      * call to the {@code Component}'s {@code processFocusEvent}
6446      * method regardless of the current {@code KeyboardFocusManager}.
6447      *
6448      * <p>Note that if the event parameter is {@code null}
6449      * the behavior is unspecified and may result in an
6450      * exception.
6451      *
6452      * @param       e the focus event
6453      * @see         java.awt.event.FocusEvent
6454      * @see         java.awt.event.FocusListener
6455      * @see         java.awt.KeyboardFocusManager
6456      * @see         #addFocusListener
6457      * @see         #enableEvents
6458      * @see         #dispatchEvent
6459      * @since       1.1
6460      */
6461     protected void processFocusEvent(FocusEvent e) {
6462         FocusListener listener = focusListener;
6463         if (listener != null) {
6464             int id = e.getID();
6465             switch(id) {
6466               case FocusEvent.FOCUS_GAINED:
6467                   listener.focusGained(e);
6468                   break;
6469               case FocusEvent.FOCUS_LOST:
6470                   listener.focusLost(e);
6471                   break;
6472             }
6473         }
6474     }
6475 
6476     /**
6477      * Processes key events occurring on this component by
6478      * dispatching them to any registered
6479      * {@code KeyListener} objects.
6480      * <p>
6481      * This method is not called unless key events are
6482      * enabled for this component. Key events are enabled
6483      * when one of the following occurs:
6484      * <ul>
6485      * <li>A {@code KeyListener} object is registered
6486      * via {@code addKeyListener}.
6487      * <li>Key events are enabled via {@code enableEvents}.
6488      * </ul>
6489      *
6490      * <p>
6491      * If key events are enabled for a {@code Component},
6492      * the current {@code KeyboardFocusManager} determines
6493      * whether or not a key event should be dispatched to
6494      * registered {@code KeyListener} objects.  The
6495      * {@code DefaultKeyboardFocusManager} will not dispatch
6496      * key events to a {@code Component} that is not the focus
6497      * owner or is not showing.
6498      * <p>
6499      * As of J2SE 1.4, {@code KeyEvent}s are redirected to
6500      * the focus owner. Please see the
6501      * <a href="doc-files/FocusSpec.html">Focus Specification</a>
6502      * for further information.
6503      * <p>
6504      * Calling a {@code Component}'s {@code dispatchEvent}
6505      * method with a {@code KeyEvent} as the argument will
6506      * result in a call to the {@code Component}'s
6507      * {@code processKeyEvent} method regardless of the
6508      * current {@code KeyboardFocusManager} as long as the
6509      * component is showing, focused, and enabled, and key events
6510      * are enabled on it.
6511      * <p>If the event parameter is {@code null}
6512      * the behavior is unspecified and may result in an
6513      * exception.
6514      *
6515      * @param       e the key event
6516      * @see         java.awt.event.KeyEvent
6517      * @see         java.awt.event.KeyListener
6518      * @see         java.awt.KeyboardFocusManager
6519      * @see         java.awt.DefaultKeyboardFocusManager
6520      * @see         #processEvent
6521      * @see         #dispatchEvent
6522      * @see         #addKeyListener
6523      * @see         #enableEvents
6524      * @see         #isShowing
6525      * @since       1.1
6526      */
6527     protected void processKeyEvent(KeyEvent e) {
6528         KeyListener listener = keyListener;
6529         if (listener != null) {
6530             int id = e.getID();
6531             switch(id) {
6532               case KeyEvent.KEY_TYPED:
6533                   listener.keyTyped(e);
6534                   break;
6535               case KeyEvent.KEY_PRESSED:
6536                   listener.keyPressed(e);
6537                   break;
6538               case KeyEvent.KEY_RELEASED:
6539                   listener.keyReleased(e);
6540                   break;
6541             }
6542         }
6543     }
6544 
6545     /**
6546      * Processes mouse events occurring on this component by
6547      * dispatching them to any registered
6548      * {@code MouseListener} objects.
6549      * <p>
6550      * This method is not called unless mouse events are
6551      * enabled for this component. Mouse events are enabled
6552      * when one of the following occurs:
6553      * <ul>
6554      * <li>A {@code MouseListener} object is registered
6555      * via {@code addMouseListener}.
6556      * <li>Mouse events are enabled via {@code enableEvents}.
6557      * </ul>
6558      * <p>Note that if the event parameter is {@code null}
6559      * the behavior is unspecified and may result in an
6560      * exception.
6561      *
6562      * @param       e the mouse event
6563      * @see         java.awt.event.MouseEvent
6564      * @see         java.awt.event.MouseListener
6565      * @see         #addMouseListener
6566      * @see         #enableEvents
6567      * @since       1.1
6568      */
6569     protected void processMouseEvent(MouseEvent e) {
6570         MouseListener listener = mouseListener;
6571         if (listener != null) {
6572             int id = e.getID();
6573             switch(id) {
6574               case MouseEvent.MOUSE_PRESSED:
6575                   listener.mousePressed(e);
6576                   break;
6577               case MouseEvent.MOUSE_RELEASED:
6578                   listener.mouseReleased(e);
6579                   break;
6580               case MouseEvent.MOUSE_CLICKED:
6581                   listener.mouseClicked(e);
6582                   break;
6583               case MouseEvent.MOUSE_EXITED:
6584                   listener.mouseExited(e);
6585                   break;
6586               case MouseEvent.MOUSE_ENTERED:
6587                   listener.mouseEntered(e);
6588                   break;
6589             }
6590         }
6591     }
6592 
6593     /**
6594      * Processes mouse motion events occurring on this component by
6595      * dispatching them to any registered
6596      * {@code MouseMotionListener} objects.
6597      * <p>
6598      * This method is not called unless mouse motion events are
6599      * enabled for this component. Mouse motion events are enabled
6600      * when one of the following occurs:
6601      * <ul>
6602      * <li>A {@code MouseMotionListener} object is registered
6603      * via {@code addMouseMotionListener}.
6604      * <li>Mouse motion events are enabled via {@code enableEvents}.
6605      * </ul>
6606      * <p>Note that if the event parameter is {@code null}
6607      * the behavior is unspecified and may result in an
6608      * exception.
6609      *
6610      * @param       e the mouse motion event
6611      * @see         java.awt.event.MouseEvent
6612      * @see         java.awt.event.MouseMotionListener
6613      * @see         #addMouseMotionListener
6614      * @see         #enableEvents
6615      * @since       1.1
6616      */
6617     protected void processMouseMotionEvent(MouseEvent e) {
6618         MouseMotionListener listener = mouseMotionListener;
6619         if (listener != null) {
6620             int id = e.getID();
6621             switch(id) {
6622               case MouseEvent.MOUSE_MOVED:
6623                   listener.mouseMoved(e);
6624                   break;
6625               case MouseEvent.MOUSE_DRAGGED:
6626                   listener.mouseDragged(e);
6627                   break;
6628             }
6629         }
6630     }
6631 
6632     /**
6633      * Processes mouse wheel events occurring on this component by
6634      * dispatching them to any registered
6635      * {@code MouseWheelListener} objects.
6636      * <p>
6637      * This method is not called unless mouse wheel events are
6638      * enabled for this component. Mouse wheel events are enabled
6639      * when one of the following occurs:
6640      * <ul>
6641      * <li>A {@code MouseWheelListener} object is registered
6642      * via {@code addMouseWheelListener}.
6643      * <li>Mouse wheel events are enabled via {@code enableEvents}.
6644      * </ul>
6645      * <p>
6646      * For information on how mouse wheel events are dispatched, see
6647      * the class description for {@link MouseWheelEvent}.
6648      * <p>
6649      * Note that if the event parameter is {@code null}
6650      * the behavior is unspecified and may result in an
6651      * exception.
6652      *
6653      * @param       e the mouse wheel event
6654      * @see         java.awt.event.MouseWheelEvent
6655      * @see         java.awt.event.MouseWheelListener
6656      * @see         #addMouseWheelListener
6657      * @see         #enableEvents
6658      * @since       1.4
6659      */
6660     protected void processMouseWheelEvent(MouseWheelEvent e) {
6661         MouseWheelListener listener = mouseWheelListener;
6662         if (listener != null) {
6663             int id = e.getID();
6664             switch(id) {
6665               case MouseEvent.MOUSE_WHEEL:
6666                   listener.mouseWheelMoved(e);
6667                   break;
6668             }
6669         }
6670     }
6671 
6672     boolean postsOldMouseEvents() {
6673         return false;
6674     }
6675 
6676     /**
6677      * Processes input method events occurring on this component by
6678      * dispatching them to any registered
6679      * {@code InputMethodListener} objects.
6680      * <p>
6681      * This method is not called unless input method events
6682      * are enabled for this component. Input method events are enabled
6683      * when one of the following occurs:
6684      * <ul>
6685      * <li>An {@code InputMethodListener} object is registered
6686      * via {@code addInputMethodListener}.
6687      * <li>Input method events are enabled via {@code enableEvents}.
6688      * </ul>
6689      * <p>Note that if the event parameter is {@code null}
6690      * the behavior is unspecified and may result in an
6691      * exception.
6692      *
6693      * @param       e the input method event
6694      * @see         java.awt.event.InputMethodEvent
6695      * @see         java.awt.event.InputMethodListener
6696      * @see         #addInputMethodListener
6697      * @see         #enableEvents
6698      * @since       1.2
6699      */
6700     protected void processInputMethodEvent(InputMethodEvent e) {
6701         InputMethodListener listener = inputMethodListener;
6702         if (listener != null) {
6703             int id = e.getID();
6704             switch (id) {
6705               case InputMethodEvent.INPUT_METHOD_TEXT_CHANGED:
6706                   listener.inputMethodTextChanged(e);
6707                   break;
6708               case InputMethodEvent.CARET_POSITION_CHANGED:
6709                   listener.caretPositionChanged(e);
6710                   break;
6711             }
6712         }
6713     }
6714 
6715     /**
6716      * Processes hierarchy events occurring on this component by
6717      * dispatching them to any registered
6718      * {@code HierarchyListener} objects.
6719      * <p>
6720      * This method is not called unless hierarchy events
6721      * are enabled for this component. Hierarchy events are enabled
6722      * when one of the following occurs:
6723      * <ul>
6724      * <li>An {@code HierarchyListener} object is registered
6725      * via {@code addHierarchyListener}.
6726      * <li>Hierarchy events are enabled via {@code enableEvents}.
6727      * </ul>
6728      * <p>Note that if the event parameter is {@code null}
6729      * the behavior is unspecified and may result in an
6730      * exception.
6731      *
6732      * @param       e the hierarchy event
6733      * @see         java.awt.event.HierarchyEvent
6734      * @see         java.awt.event.HierarchyListener
6735      * @see         #addHierarchyListener
6736      * @see         #enableEvents
6737      * @since       1.3
6738      */
6739     protected void processHierarchyEvent(HierarchyEvent e) {
6740         HierarchyListener listener = hierarchyListener;
6741         if (listener != null) {
6742             int id = e.getID();
6743             switch (id) {
6744               case HierarchyEvent.HIERARCHY_CHANGED:
6745                   listener.hierarchyChanged(e);
6746                   break;
6747             }
6748         }
6749     }
6750 
6751     /**
6752      * Processes hierarchy bounds events occurring on this component by
6753      * dispatching them to any registered
6754      * {@code HierarchyBoundsListener} objects.
6755      * <p>
6756      * This method is not called unless hierarchy bounds events
6757      * are enabled for this component. Hierarchy bounds events are enabled
6758      * when one of the following occurs:
6759      * <ul>
6760      * <li>An {@code HierarchyBoundsListener} object is registered
6761      * via {@code addHierarchyBoundsListener}.
6762      * <li>Hierarchy bounds events are enabled via {@code enableEvents}.
6763      * </ul>
6764      * <p>Note that if the event parameter is {@code null}
6765      * the behavior is unspecified and may result in an
6766      * exception.
6767      *
6768      * @param       e the hierarchy event
6769      * @see         java.awt.event.HierarchyEvent
6770      * @see         java.awt.event.HierarchyBoundsListener
6771      * @see         #addHierarchyBoundsListener
6772      * @see         #enableEvents
6773      * @since       1.3
6774      */
6775     protected void processHierarchyBoundsEvent(HierarchyEvent e) {
6776         HierarchyBoundsListener listener = hierarchyBoundsListener;
6777         if (listener != null) {
6778             int id = e.getID();
6779             switch (id) {
6780               case HierarchyEvent.ANCESTOR_MOVED:
6781                   listener.ancestorMoved(e);
6782                   break;
6783               case HierarchyEvent.ANCESTOR_RESIZED:
6784                   listener.ancestorResized(e);
6785                   break;
6786             }
6787         }
6788     }
6789 
6790     /**
6791      * @param  evt the event to handle
6792      * @return {@code true} if the event was handled, {@code false} otherwise
6793      * @deprecated As of JDK version 1.1
6794      * replaced by processEvent(AWTEvent).
6795      */
6796     @Deprecated
6797     public boolean handleEvent(Event evt) {
6798         switch (evt.id) {
6799           case Event.MOUSE_ENTER:
6800               return mouseEnter(evt, evt.x, evt.y);
6801 
6802           case Event.MOUSE_EXIT:
6803               return mouseExit(evt, evt.x, evt.y);
6804 
6805           case Event.MOUSE_MOVE:
6806               return mouseMove(evt, evt.x, evt.y);
6807 
6808           case Event.MOUSE_DOWN:
6809               return mouseDown(evt, evt.x, evt.y);
6810 
6811           case Event.MOUSE_DRAG:
6812               return mouseDrag(evt, evt.x, evt.y);
6813 
6814           case Event.MOUSE_UP:
6815               return mouseUp(evt, evt.x, evt.y);
6816 
6817           case Event.KEY_PRESS:
6818           case Event.KEY_ACTION:
6819               return keyDown(evt, evt.key);
6820 
6821           case Event.KEY_RELEASE:
6822           case Event.KEY_ACTION_RELEASE:
6823               return keyUp(evt, evt.key);
6824 
6825           case Event.ACTION_EVENT:
6826               return action(evt, evt.arg);
6827           case Event.GOT_FOCUS:
6828               return gotFocus(evt, evt.arg);
6829           case Event.LOST_FOCUS:
6830               return lostFocus(evt, evt.arg);
6831         }
6832         return false;
6833     }
6834 
6835     /**
6836      * @param  evt the event to handle
6837      * @param  x the x coordinate
6838      * @param  y the y coordinate
6839      * @return {@code false}
6840      * @deprecated As of JDK version 1.1,
6841      * replaced by processMouseEvent(MouseEvent).
6842      */
6843     @Deprecated
6844     public boolean mouseDown(Event evt, int x, int y) {
6845         return false;
6846     }
6847 
6848     /**
6849      * @param  evt the event to handle
6850      * @param  x the x coordinate
6851      * @param  y the y coordinate
6852      * @return {@code false}
6853      * @deprecated As of JDK version 1.1,
6854      * replaced by processMouseMotionEvent(MouseEvent).
6855      */
6856     @Deprecated
6857     public boolean mouseDrag(Event evt, int x, int y) {
6858         return false;
6859     }
6860 
6861     /**
6862      * @param  evt the event to handle
6863      * @param  x the x coordinate
6864      * @param  y the y coordinate
6865      * @return {@code false}
6866      * @deprecated As of JDK version 1.1,
6867      * replaced by processMouseEvent(MouseEvent).
6868      */
6869     @Deprecated
6870     public boolean mouseUp(Event evt, int x, int y) {
6871         return false;
6872     }
6873 
6874     /**
6875      * @param  evt the event to handle
6876      * @param  x the x coordinate
6877      * @param  y the y coordinate
6878      * @return {@code false}
6879      * @deprecated As of JDK version 1.1,
6880      * replaced by processMouseMotionEvent(MouseEvent).
6881      */
6882     @Deprecated
6883     public boolean mouseMove(Event evt, int x, int y) {
6884         return false;
6885     }
6886 
6887     /**
6888      * @param  evt the event to handle
6889      * @param  x the x coordinate
6890      * @param  y the y coordinate
6891      * @return {@code false}
6892      * @deprecated As of JDK version 1.1,
6893      * replaced by processMouseEvent(MouseEvent).
6894      */
6895     @Deprecated
6896     public boolean mouseEnter(Event evt, int x, int y) {
6897         return false;
6898     }
6899 
6900     /**
6901      * @param  evt the event to handle
6902      * @param  x the x coordinate
6903      * @param  y the y coordinate
6904      * @return {@code false}
6905      * @deprecated As of JDK version 1.1,
6906      * replaced by processMouseEvent(MouseEvent).
6907      */
6908     @Deprecated
6909     public boolean mouseExit(Event evt, int x, int y) {
6910         return false;
6911     }
6912 
6913     /**
6914      * @param  evt the event to handle
6915      * @param  key the key pressed
6916      * @return {@code false}
6917      * @deprecated As of JDK version 1.1,
6918      * replaced by processKeyEvent(KeyEvent).
6919      */
6920     @Deprecated
6921     public boolean keyDown(Event evt, int key) {
6922         return false;
6923     }
6924 
6925     /**
6926      * @param  evt the event to handle
6927      * @param  key the key pressed
6928      * @return {@code false}
6929      * @deprecated As of JDK version 1.1,
6930      * replaced by processKeyEvent(KeyEvent).
6931      */
6932     @Deprecated
6933     public boolean keyUp(Event evt, int key) {
6934         return false;
6935     }
6936 
6937     /**
6938      * @param  evt the event to handle
6939      * @param  what the object acted on
6940      * @return {@code false}
6941      * @deprecated As of JDK version 1.1,
6942      * should register this component as ActionListener on component
6943      * which fires action events.
6944      */
6945     @Deprecated
6946     public boolean action(Event evt, Object what) {
6947         return false;
6948     }
6949 
6950     /**
6951      * Makes this {@code Component} displayable by connecting it to a
6952      * native screen resource.
6953      * This method is called internally by the toolkit and should
6954      * not be called directly by programs.
6955      * <p>
6956      * This method changes layout-related information, and therefore,
6957      * invalidates the component hierarchy.
6958      *
6959      * @see       #isDisplayable
6960      * @see       #removeNotify
6961      * @see #invalidate
6962      * @since 1.0
6963      */
6964     public void addNotify() {
6965         synchronized (getTreeLock()) {
6966             ComponentPeer peer = this.peer;
6967             if (peer == null || peer instanceof LightweightPeer){
6968                 if (peer == null) {
6969                     // Update both the Component's peer variable and the local
6970                     // variable we use for thread safety.
6971                     this.peer = peer = getComponentFactory().createComponent(this);
6972                 }
6973 
6974                 // This is a lightweight component which means it won't be
6975                 // able to get window-related events by itself.  If any
6976                 // have been enabled, then the nearest native container must
6977                 // be enabled.
6978                 if (parent != null) {
6979                     long mask = 0;
6980                     if ((mouseListener != null) || ((eventMask & AWTEvent.MOUSE_EVENT_MASK) != 0)) {
6981                         mask |= AWTEvent.MOUSE_EVENT_MASK;
6982                     }
6983                     if ((mouseMotionListener != null) ||
6984                         ((eventMask & AWTEvent.MOUSE_MOTION_EVENT_MASK) != 0)) {
6985                         mask |= AWTEvent.MOUSE_MOTION_EVENT_MASK;
6986                     }
6987                     if ((mouseWheelListener != null ) ||
6988                         ((eventMask & AWTEvent.MOUSE_WHEEL_EVENT_MASK) != 0)) {
6989                         mask |= AWTEvent.MOUSE_WHEEL_EVENT_MASK;
6990                     }
6991                     if (focusListener != null || (eventMask & AWTEvent.FOCUS_EVENT_MASK) != 0) {
6992                         mask |= AWTEvent.FOCUS_EVENT_MASK;
6993                     }
6994                     if (keyListener != null || (eventMask & AWTEvent.KEY_EVENT_MASK) != 0) {
6995                         mask |= AWTEvent.KEY_EVENT_MASK;
6996                     }
6997                     if (mask != 0) {
6998                         parent.proxyEnableEvents(mask);
6999                     }
7000                 }
7001             } else {
7002                 // It's native. If the parent is lightweight it will need some
7003                 // help.
7004                 Container parent = getContainer();
7005                 if (parent != null && parent.isLightweight()) {
7006                     relocateComponent();
7007                     if (!parent.isRecursivelyVisibleUpToHeavyweightContainer())
7008                     {
7009                         peer.setVisible(false);
7010                     }
7011                 }
7012             }
7013             invalidate();
7014 
7015             int npopups = (popups != null? popups.size() : 0);
7016             for (int i = 0 ; i < npopups ; i++) {
7017                 PopupMenu popup = popups.elementAt(i);
7018                 popup.addNotify();
7019             }
7020 
7021             if (dropTarget != null) dropTarget.addNotify();
7022 
7023             peerFont = getFont();
7024 
7025             if (getContainer() != null && !isAddNotifyComplete) {
7026                 getContainer().increaseComponentCount(this);
7027             }
7028 
7029 
7030             // Update stacking order
7031             updateZOrder();
7032 
7033             if (!isAddNotifyComplete) {
7034                 mixOnShowing();
7035             }
7036 
7037             isAddNotifyComplete = true;
7038 
7039             if (hierarchyListener != null ||
7040                 (eventMask & AWTEvent.HIERARCHY_EVENT_MASK) != 0 ||
7041                 Toolkit.enabledOnToolkit(AWTEvent.HIERARCHY_EVENT_MASK)) {
7042                 HierarchyEvent e =
7043                     new HierarchyEvent(this, HierarchyEvent.HIERARCHY_CHANGED,
7044                                        this, parent,
7045                                        HierarchyEvent.DISPLAYABILITY_CHANGED |
7046                                        ((isRecursivelyVisible())
7047                                         ? HierarchyEvent.SHOWING_CHANGED
7048                                         : 0));
7049                 dispatchEvent(e);
7050             }
7051         }
7052     }
7053 
7054     /**
7055      * Makes this {@code Component} undisplayable by destroying it native
7056      * screen resource.
7057      * <p>
7058      * This method is called by the toolkit internally and should
7059      * not be called directly by programs. Code overriding
7060      * this method should call {@code super.removeNotify} as
7061      * the first line of the overriding method.
7062      *
7063      * @see       #isDisplayable
7064      * @see       #addNotify
7065      * @since 1.0
7066      */
7067     public void removeNotify() {
7068         KeyboardFocusManager.clearMostRecentFocusOwner(this);
7069         if (KeyboardFocusManager.getCurrentKeyboardFocusManager().
7070             getPermanentFocusOwner() == this)
7071         {
7072             KeyboardFocusManager.getCurrentKeyboardFocusManager().
7073                 setGlobalPermanentFocusOwner(null);
7074         }
7075 
7076         synchronized (getTreeLock()) {
7077             if (isFocusOwner() && KeyboardFocusManager.isAutoFocusTransferEnabledFor(this)) {
7078                 transferFocus(true);
7079             }
7080 
7081             if (getContainer() != null && isAddNotifyComplete) {
7082                 getContainer().decreaseComponentCount(this);
7083             }
7084 
7085             int npopups = (popups != null? popups.size() : 0);
7086             for (int i = 0 ; i < npopups ; i++) {
7087                 PopupMenu popup = popups.elementAt(i);
7088                 popup.removeNotify();
7089             }
7090             // If there is any input context for this component, notify
7091             // that this component is being removed. (This has to be done
7092             // before hiding peer.)
7093             if ((eventMask & AWTEvent.INPUT_METHODS_ENABLED_MASK) != 0) {
7094                 InputContext inputContext = getInputContext();
7095                 if (inputContext != null) {
7096                     inputContext.removeNotify(this);
7097                 }
7098             }
7099 
7100             ComponentPeer p = peer;
7101             if (p != null) {
7102                 boolean isLightweight = isLightweight();
7103 
7104                 if (bufferStrategy instanceof FlipBufferStrategy) {
7105                     ((FlipBufferStrategy)bufferStrategy).destroyBuffers();
7106                 }
7107 
7108                 if (dropTarget != null) dropTarget.removeNotify();
7109 
7110                 // Hide peer first to stop system events such as cursor moves.
7111                 if (visible) {
7112                     p.setVisible(false);
7113                 }
7114 
7115                 peer = null; // Stop peer updates.
7116                 peerFont = null;
7117 
7118                 Toolkit.getEventQueue().removeSourceEvents(this, false);
7119                 KeyboardFocusManager.getCurrentKeyboardFocusManager().
7120                     discardKeyEvents(this);
7121 
7122                 p.dispose();
7123 
7124                 mixOnHiding(isLightweight);
7125 
7126                 isAddNotifyComplete = false;
7127                 // Nullifying compoundShape means that the component has normal shape
7128                 // (or has no shape at all).
7129                 this.compoundShape = null;
7130             }
7131 
7132             if (hierarchyListener != null ||
7133                 (eventMask & AWTEvent.HIERARCHY_EVENT_MASK) != 0 ||
7134                 Toolkit.enabledOnToolkit(AWTEvent.HIERARCHY_EVENT_MASK)) {
7135                 HierarchyEvent e =
7136                     new HierarchyEvent(this, HierarchyEvent.HIERARCHY_CHANGED,
7137                                        this, parent,
7138                                        HierarchyEvent.DISPLAYABILITY_CHANGED |
7139                                        ((isRecursivelyVisible())
7140                                         ? HierarchyEvent.SHOWING_CHANGED
7141                                         : 0));
7142                 dispatchEvent(e);
7143             }
7144         }
7145     }
7146 
7147     /**
7148      * @param  evt the event to handle
7149      * @param  what the object focused
7150      * @return  {@code false}
7151      * @deprecated As of JDK version 1.1,
7152      * replaced by processFocusEvent(FocusEvent).
7153      */
7154     @Deprecated
7155     public boolean gotFocus(Event evt, Object what) {
7156         return false;
7157     }
7158 
7159     /**
7160      * @param evt  the event to handle
7161      * @param what the object focused
7162      * @return  {@code false}
7163      * @deprecated As of JDK version 1.1,
7164      * replaced by processFocusEvent(FocusEvent).
7165      */
7166     @Deprecated
7167     public boolean lostFocus(Event evt, Object what) {
7168         return false;
7169     }
7170 
7171     /**
7172      * Returns whether this {@code Component} can become the focus
7173      * owner.
7174      *
7175      * @return {@code true} if this {@code Component} is
7176      * focusable; {@code false} otherwise
7177      * @see #setFocusable
7178      * @since 1.1
7179      * @deprecated As of 1.4, replaced by {@code isFocusable()}.
7180      */
7181     @Deprecated
7182     public boolean isFocusTraversable() {
7183         if (isFocusTraversableOverridden == FOCUS_TRAVERSABLE_UNKNOWN) {
7184             isFocusTraversableOverridden = FOCUS_TRAVERSABLE_DEFAULT;
7185         }
7186         return focusable;
7187     }
7188 
7189     /**
7190      * Returns whether this Component can be focused.
7191      *
7192      * @return {@code true} if this Component is focusable;
7193      *         {@code false} otherwise.
7194      * @see #setFocusable
7195      * @since 1.4
7196      */
7197     public boolean isFocusable() {
7198         return isFocusTraversable();
7199     }
7200 
7201     /**
7202      * Sets the focusable state of this Component to the specified value. This
7203      * value overrides the Component's default focusability.
7204      *
7205      * @param focusable indicates whether this Component is focusable
7206      * @see #isFocusable
7207      * @since 1.4
7208      */
7209     public void setFocusable(boolean focusable) {
7210         boolean oldFocusable;
7211         synchronized (this) {
7212             oldFocusable = this.focusable;
7213             this.focusable = focusable;
7214         }
7215         isFocusTraversableOverridden = FOCUS_TRAVERSABLE_SET;
7216 
7217         firePropertyChange("focusable", oldFocusable, focusable);
7218         if (oldFocusable && !focusable) {
7219             if (isFocusOwner() && KeyboardFocusManager.isAutoFocusTransferEnabled()) {
7220                 transferFocus(true);
7221             }
7222             KeyboardFocusManager.clearMostRecentFocusOwner(this);
7223         }
7224     }
7225 
7226     final boolean isFocusTraversableOverridden() {
7227         return (isFocusTraversableOverridden != FOCUS_TRAVERSABLE_DEFAULT);
7228     }
7229 
7230     /**
7231      * Sets the focus traversal keys for a given traversal operation for this
7232      * Component.
7233      * <p>
7234      * The default values for a Component's focus traversal keys are
7235      * implementation-dependent. Sun recommends that all implementations for a
7236      * particular native platform use the same default values. The
7237      * recommendations for Windows and Unix are listed below. These
7238      * recommendations are used in the Sun AWT implementations.
7239      *
7240      * <table class="striped">
7241      * <caption>Recommended default values for a Component's focus traversal
7242      * keys</caption>
7243      * <thead>
7244      * <tr>
7245      *    <th>Identifier</th>
7246      *    <th>Meaning</th>
7247      *    <th>Default</th>
7248      * </tr>
7249      * </thead>
7250      * <tbody>
7251      * <tr>
7252      *    <td>KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS</td>
7253      *    <td>Normal forward keyboard traversal</td>
7254      *    <td>TAB on KEY_PRESSED, CTRL-TAB on KEY_PRESSED</td>
7255      * </tr>
7256      * <tr>
7257      *    <td>KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS</td>
7258      *    <td>Normal reverse keyboard traversal</td>
7259      *    <td>SHIFT-TAB on KEY_PRESSED, CTRL-SHIFT-TAB on KEY_PRESSED</td>
7260      * </tr>
7261      * <tr>
7262      *    <td>KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS</td>
7263      *    <td>Go up one focus traversal cycle</td>
7264      *    <td>none</td>
7265      * </tr>
7266      * </tbody>
7267      * </table>
7268      *
7269      * To disable a traversal key, use an empty Set; Collections.EMPTY_SET is
7270      * recommended.
7271      * <p>
7272      * Using the AWTKeyStroke API, client code can specify on which of two
7273      * specific KeyEvents, KEY_PRESSED or KEY_RELEASED, the focus traversal
7274      * operation will occur. Regardless of which KeyEvent is specified,
7275      * however, all KeyEvents related to the focus traversal key, including the
7276      * associated KEY_TYPED event, will be consumed, and will not be dispatched
7277      * to any Component. It is a runtime error to specify a KEY_TYPED event as
7278      * mapping to a focus traversal operation, or to map the same event to
7279      * multiple default focus traversal operations.
7280      * <p>
7281      * If a value of null is specified for the Set, this Component inherits the
7282      * Set from its parent. If all ancestors of this Component have null
7283      * specified for the Set, then the current KeyboardFocusManager's default
7284      * Set is used.
7285      * <p>
7286      * This method may throw a {@code ClassCastException} if any {@code Object}
7287      * in {@code keystrokes} is not an {@code AWTKeyStroke}.
7288      *
7289      * @param id one of KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS,
7290      *        KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS, or
7291      *        KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS
7292      * @param keystrokes the Set of AWTKeyStroke for the specified operation
7293      * @see #getFocusTraversalKeys
7294      * @see KeyboardFocusManager#FORWARD_TRAVERSAL_KEYS
7295      * @see KeyboardFocusManager#BACKWARD_TRAVERSAL_KEYS
7296      * @see KeyboardFocusManager#UP_CYCLE_TRAVERSAL_KEYS
7297      * @throws IllegalArgumentException if id is not one of
7298      *         KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS,
7299      *         KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS, or
7300      *         KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS, or if keystrokes
7301      *         contains null, or if any keystroke represents a KEY_TYPED event,
7302      *         or if any keystroke already maps to another focus traversal
7303      *         operation for this Component
7304      * @since 1.4
7305      */
7306     public void setFocusTraversalKeys(int id,
7307                                       Set<? extends AWTKeyStroke> keystrokes)
7308     {
7309         if (id < 0 || id >= KeyboardFocusManager.TRAVERSAL_KEY_LENGTH - 1) {
7310             throw new IllegalArgumentException("invalid focus traversal key identifier");
7311         }
7312 
7313         setFocusTraversalKeys_NoIDCheck(id, keystrokes);
7314     }
7315 
7316     /**
7317      * Returns the Set of focus traversal keys for a given traversal operation
7318      * for this Component. (See
7319      * {@code setFocusTraversalKeys} for a full description of each key.)
7320      * <p>
7321      * If a Set of traversal keys has not been explicitly defined for this
7322      * Component, then this Component's parent's Set is returned. If no Set
7323      * has been explicitly defined for any of this Component's ancestors, then
7324      * the current KeyboardFocusManager's default Set is returned.
7325      *
7326      * @param id one of KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS,
7327      *        KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS, or
7328      *        KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS
7329      * @return the Set of AWTKeyStrokes for the specified operation. The Set
7330      *         will be unmodifiable, and may be empty. null will never be
7331      *         returned.
7332      * @see #setFocusTraversalKeys
7333      * @see KeyboardFocusManager#FORWARD_TRAVERSAL_KEYS
7334      * @see KeyboardFocusManager#BACKWARD_TRAVERSAL_KEYS
7335      * @see KeyboardFocusManager#UP_CYCLE_TRAVERSAL_KEYS
7336      * @throws IllegalArgumentException if id is not one of
7337      *         KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS,
7338      *         KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS, or
7339      *         KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS
7340      * @since 1.4
7341      */
7342     public Set<AWTKeyStroke> getFocusTraversalKeys(int id) {
7343         if (id < 0 || id >= KeyboardFocusManager.TRAVERSAL_KEY_LENGTH - 1) {
7344             throw new IllegalArgumentException("invalid focus traversal key identifier");
7345         }
7346 
7347         return getFocusTraversalKeys_NoIDCheck(id);
7348     }
7349 
7350     // We define these methods so that Container does not need to repeat this
7351     // code. Container cannot call super.<method> because Container allows
7352     // DOWN_CYCLE_TRAVERSAL_KEY while Component does not. The Component method
7353     // would erroneously generate an IllegalArgumentException for
7354     // DOWN_CYCLE_TRAVERSAL_KEY.
7355     final void setFocusTraversalKeys_NoIDCheck(int id, Set<? extends AWTKeyStroke> keystrokes) {
7356         Set<AWTKeyStroke> oldKeys;
7357 
7358         synchronized (this) {
7359             if (focusTraversalKeys == null) {
7360                 initializeFocusTraversalKeys();
7361             }
7362 
7363             if (keystrokes != null) {
7364                 for (AWTKeyStroke keystroke : keystrokes ) {
7365 
7366                     if (keystroke == null) {
7367                         throw new IllegalArgumentException("cannot set null focus traversal key");
7368                     }
7369 
7370                     if (keystroke.getKeyChar() != KeyEvent.CHAR_UNDEFINED) {
7371                         throw new IllegalArgumentException("focus traversal keys cannot map to KEY_TYPED events");
7372                     }
7373 
7374                     for (int i = 0; i < focusTraversalKeys.length; i++) {
7375                         if (i == id) {
7376                             continue;
7377                         }
7378 
7379                         if (getFocusTraversalKeys_NoIDCheck(i).contains(keystroke))
7380                         {
7381                             throw new IllegalArgumentException("focus traversal keys must be unique for a Component");
7382                         }
7383                     }
7384                 }
7385             }
7386 
7387             oldKeys = focusTraversalKeys[id];
7388             focusTraversalKeys[id] = (keystrokes != null)
7389                 ? Collections.unmodifiableSet(new HashSet<AWTKeyStroke>(keystrokes))
7390                 : null;
7391         }
7392 
7393         firePropertyChange(focusTraversalKeyPropertyNames[id], oldKeys,
7394                            keystrokes);
7395     }
7396     final Set<AWTKeyStroke> getFocusTraversalKeys_NoIDCheck(int id) {
7397         // Okay to return Set directly because it is an unmodifiable view
7398         @SuppressWarnings("unchecked")
7399         Set<AWTKeyStroke> keystrokes = (focusTraversalKeys != null)
7400             ? focusTraversalKeys[id]
7401             : null;
7402 
7403         if (keystrokes != null) {
7404             return keystrokes;
7405         } else {
7406             Container parent = this.parent;
7407             if (parent != null) {
7408                 return parent.getFocusTraversalKeys(id);
7409             } else {
7410                 return KeyboardFocusManager.getCurrentKeyboardFocusManager().
7411                     getDefaultFocusTraversalKeys(id);
7412             }
7413         }
7414     }
7415 
7416     /**
7417      * Returns whether the Set of focus traversal keys for the given focus
7418      * traversal operation has been explicitly defined for this Component. If
7419      * this method returns {@code false}, this Component is inheriting the
7420      * Set from an ancestor, or from the current KeyboardFocusManager.
7421      *
7422      * @param id one of KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS,
7423      *        KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS, or
7424      *        KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS
7425      * @return {@code true} if the Set of focus traversal keys for the
7426      *         given focus traversal operation has been explicitly defined for
7427      *         this Component; {@code false} otherwise.
7428      * @throws IllegalArgumentException if id is not one of
7429      *         KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS,
7430      *         KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS, or
7431      *         KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS
7432      * @since 1.4
7433      */
7434     public boolean areFocusTraversalKeysSet(int id) {
7435         if (id < 0 || id >= KeyboardFocusManager.TRAVERSAL_KEY_LENGTH - 1) {
7436             throw new IllegalArgumentException("invalid focus traversal key identifier");
7437         }
7438 
7439         return (focusTraversalKeys != null && focusTraversalKeys[id] != null);
7440     }
7441 
7442     /**
7443      * Sets whether focus traversal keys are enabled for this Component.
7444      * Components for which focus traversal keys are disabled receive key
7445      * events for focus traversal keys. Components for which focus traversal
7446      * keys are enabled do not see these events; instead, the events are
7447      * automatically converted to traversal operations.
7448      *
7449      * @param focusTraversalKeysEnabled whether focus traversal keys are
7450      *        enabled for this Component
7451      * @see #getFocusTraversalKeysEnabled
7452      * @see #setFocusTraversalKeys
7453      * @see #getFocusTraversalKeys
7454      * @since 1.4
7455      */
7456     public void setFocusTraversalKeysEnabled(boolean
7457                                              focusTraversalKeysEnabled) {
7458         boolean oldFocusTraversalKeysEnabled;
7459         synchronized (this) {
7460             oldFocusTraversalKeysEnabled = this.focusTraversalKeysEnabled;
7461             this.focusTraversalKeysEnabled = focusTraversalKeysEnabled;
7462         }
7463         firePropertyChange("focusTraversalKeysEnabled",
7464                            oldFocusTraversalKeysEnabled,
7465                            focusTraversalKeysEnabled);
7466     }
7467 
7468     /**
7469      * Returns whether focus traversal keys are enabled for this Component.
7470      * Components for which focus traversal keys are disabled receive key
7471      * events for focus traversal keys. Components for which focus traversal
7472      * keys are enabled do not see these events; instead, the events are
7473      * automatically converted to traversal operations.
7474      *
7475      * @return whether focus traversal keys are enabled for this Component
7476      * @see #setFocusTraversalKeysEnabled
7477      * @see #setFocusTraversalKeys
7478      * @see #getFocusTraversalKeys
7479      * @since 1.4
7480      */
7481     public boolean getFocusTraversalKeysEnabled() {
7482         return focusTraversalKeysEnabled;
7483     }
7484 
7485     /**
7486      * Requests that this Component get the input focus, and that this
7487      * Component's top-level ancestor become the focused Window. This
7488      * component must be displayable, focusable, visible and all of
7489      * its ancestors (with the exception of the top-level Window) must
7490      * be visible for the request to be granted. Every effort will be
7491      * made to honor the request; however, in some cases it may be
7492      * impossible to do so. Developers must never assume that this
7493      * Component is the focus owner until this Component receives a
7494      * FOCUS_GAINED event. If this request is denied because this
7495      * Component's top-level Window cannot become the focused Window,
7496      * the request will be remembered and will be granted when the
7497      * Window is later focused by the user.
7498      * <p>
7499      * This method cannot be used to set the focus owner to no Component at
7500      * all. Use {@code KeyboardFocusManager.clearGlobalFocusOwner()}
7501      * instead.
7502      * <p>
7503      * Because the focus behavior of this method is platform-dependent,
7504      * developers are strongly encouraged to use
7505      * {@code requestFocusInWindow} when possible.
7506      *
7507      * <p>Note: Not all focus transfers result from invoking this method. As
7508      * such, a component may receive focus without this or any of the other
7509      * {@code requestFocus} methods of {@code Component} being invoked.
7510      *
7511      * @see #requestFocusInWindow
7512      * @see java.awt.event.FocusEvent
7513      * @see #addFocusListener
7514      * @see #isFocusable
7515      * @see #isDisplayable
7516      * @see KeyboardFocusManager#clearGlobalFocusOwner
7517      * @since 1.0
7518      */
7519     public void requestFocus() {
7520         requestFocusHelper(false, true);
7521     }
7522 
7523 
7524     /**
7525      * Requests by the reason of {@code cause} that this Component get the input
7526      * focus, and that this Component's top-level ancestor become the
7527      * focused Window. This component must be displayable, focusable, visible
7528      * and all of its ancestors (with the exception of the top-level Window)
7529      * must be visible for the request to be granted. Every effort will be
7530      * made to honor the request; however, in some cases it may be
7531      * impossible to do so. Developers must never assume that this
7532      * Component is the focus owner until this Component receives a
7533      * FOCUS_GAINED event.
7534      * <p>
7535      * The focus request effect may also depend on the provided
7536      * cause value. If this request is succeed the {@code FocusEvent}
7537      * generated in the result will receive the cause value specified as the
7538      * argument of method. If this request is denied because this Component's
7539      * top-level Window cannot become the focused Window, the request will be
7540      * remembered and will be granted when the Window is later focused by the
7541      * user.
7542      * <p>
7543      * This method cannot be used to set the focus owner to no Component at
7544      * all. Use {@code KeyboardFocusManager.clearGlobalFocusOwner()}
7545      * instead.
7546      * <p>
7547      * Because the focus behavior of this method is platform-dependent,
7548      * developers are strongly encouraged to use
7549      * {@code requestFocusInWindow(FocusEvent.Cause)} when possible.
7550      *
7551      * <p>Note: Not all focus transfers result from invoking this method. As
7552      * such, a component may receive focus without this or any of the other
7553      * {@code requestFocus} methods of {@code Component} being invoked.
7554      *
7555      * @param  cause the cause why the focus is requested
7556      * @see FocusEvent
7557      * @see FocusEvent.Cause
7558      * @see #requestFocusInWindow(FocusEvent.Cause)
7559      * @see java.awt.event.FocusEvent
7560      * @see #addFocusListener
7561      * @see #isFocusable
7562      * @see #isDisplayable
7563      * @see KeyboardFocusManager#clearGlobalFocusOwner
7564      * @since 9
7565      */
7566     public void requestFocus(FocusEvent.Cause cause) {
7567         requestFocusHelper(false, true, cause);
7568     }
7569 
7570     /**
7571      * Requests that this {@code Component} get the input focus,
7572      * and that this {@code Component}'s top-level ancestor
7573      * become the focused {@code Window}. This component must be
7574      * displayable, focusable, visible and all of its ancestors (with
7575      * the exception of the top-level Window) must be visible for the
7576      * request to be granted. Every effort will be made to honor the
7577      * request; however, in some cases it may be impossible to do
7578      * so. Developers must never assume that this component is the
7579      * focus owner until this component receives a FOCUS_GAINED
7580      * event. If this request is denied because this component's
7581      * top-level window cannot become the focused window, the request
7582      * will be remembered and will be granted when the window is later
7583      * focused by the user.
7584      * <p>
7585      * This method returns a boolean value. If {@code false} is returned,
7586      * the request is <b>guaranteed to fail</b>. If {@code true} is
7587      * returned, the request will succeed <b>unless</b> it is vetoed, or an
7588      * extraordinary event, such as disposal of the component's peer, occurs
7589      * before the request can be granted by the native windowing system. Again,
7590      * while a return value of {@code true} indicates that the request is
7591      * likely to succeed, developers must never assume that this component is
7592      * the focus owner until this component receives a FOCUS_GAINED event.
7593      * <p>
7594      * This method cannot be used to set the focus owner to no component at
7595      * all. Use {@code KeyboardFocusManager.clearGlobalFocusOwner}
7596      * instead.
7597      * <p>
7598      * Because the focus behavior of this method is platform-dependent,
7599      * developers are strongly encouraged to use
7600      * {@code requestFocusInWindow} when possible.
7601      * <p>
7602      * Every effort will be made to ensure that {@code FocusEvent}s
7603      * generated as a
7604      * result of this request will have the specified temporary value. However,
7605      * because specifying an arbitrary temporary state may not be implementable
7606      * on all native windowing systems, correct behavior for this method can be
7607      * guaranteed only for lightweight {@code Component}s.
7608      * This method is not intended
7609      * for general use, but exists instead as a hook for lightweight component
7610      * libraries, such as Swing.
7611      *
7612      * <p>Note: Not all focus transfers result from invoking this method. As
7613      * such, a component may receive focus without this or any of the other
7614      * {@code requestFocus} methods of {@code Component} being invoked.
7615      *
7616      * @param temporary true if the focus change is temporary,
7617      *        such as when the window loses the focus; for
7618      *        more information on temporary focus changes see the
7619      *<a href="../../java/awt/doc-files/FocusSpec.html">Focus Specification</a>
7620      * @return {@code false} if the focus change request is guaranteed to
7621      *         fail; {@code true} if it is likely to succeed
7622      * @see java.awt.event.FocusEvent
7623      * @see #addFocusListener
7624      * @see #isFocusable
7625      * @see #isDisplayable
7626      * @see KeyboardFocusManager#clearGlobalFocusOwner
7627      * @since 1.4
7628      */
7629     protected boolean requestFocus(boolean temporary) {
7630         return requestFocusHelper(temporary, true);
7631     }
7632 
7633     /**
7634      * Requests by the reason of {@code cause} that this {@code Component} get
7635      * the input focus, and that this {@code Component}'s top-level ancestor
7636      * become the focused {@code Window}. This component must be
7637      * displayable, focusable, visible and all of its ancestors (with
7638      * the exception of the top-level Window) must be visible for the
7639      * request to be granted. Every effort will be made to honor the
7640      * request; however, in some cases it may be impossible to do
7641      * so. Developers must never assume that this component is the
7642      * focus owner until this component receives a FOCUS_GAINED
7643      * event. If this request is denied because this component's
7644      * top-level window cannot become the focused window, the request
7645      * will be remembered and will be granted when the window is later
7646      * focused by the user.
7647      * <p>
7648      * This method returns a boolean value. If {@code false} is returned,
7649      * the request is <b>guaranteed to fail</b>. If {@code true} is
7650      * returned, the request will succeed <b>unless</b> it is vetoed, or an
7651      * extraordinary event, such as disposal of the component's peer, occurs
7652      * before the request can be granted by the native windowing system. Again,
7653      * while a return value of {@code true} indicates that the request is
7654      * likely to succeed, developers must never assume that this component is
7655      * the focus owner until this component receives a FOCUS_GAINED event.
7656      * <p>
7657      * The focus request effect may also depend on the provided
7658      * cause value. If this request is succeed the {FocusEvent}
7659      * generated in the result will receive the cause value specified as the
7660      * argument of the method.
7661      * <p>
7662      * This method cannot be used to set the focus owner to no component at
7663      * all. Use {@code KeyboardFocusManager.clearGlobalFocusOwner}
7664      * instead.
7665      * <p>
7666      * Because the focus behavior of this method is platform-dependent,
7667      * developers are strongly encouraged to use
7668      * {@code requestFocusInWindow} when possible.
7669      * <p>
7670      * Every effort will be made to ensure that {@code FocusEvent}s
7671      * generated as a
7672      * result of this request will have the specified temporary value. However,
7673      * because specifying an arbitrary temporary state may not be implementable
7674      * on all native windowing systems, correct behavior for this method can be
7675      * guaranteed only for lightweight {@code Component}s.
7676      * This method is not intended
7677      * for general use, but exists instead as a hook for lightweight component
7678      * libraries, such as Swing.
7679      * <p>
7680      * Note: Not all focus transfers result from invoking this method. As
7681      * such, a component may receive focus without this or any of the other
7682      * {@code requestFocus} methods of {@code Component} being invoked.
7683      *
7684      * @param temporary true if the focus change is temporary,
7685      *        such as when the window loses the focus; for
7686      *        more information on temporary focus changes see the
7687      *<a href="../../java/awt/doc-files/FocusSpec.html">Focus Specification</a>
7688      *
7689      * @param  cause the cause why the focus is requested
7690      * @return {@code false} if the focus change request is guaranteed to
7691      *         fail; {@code true} if it is likely to succeed
7692      * @see FocusEvent
7693      * @see FocusEvent.Cause
7694      * @see #addFocusListener
7695      * @see #isFocusable
7696      * @see #isDisplayable
7697      * @see KeyboardFocusManager#clearGlobalFocusOwner
7698      * @since 9
7699      */
7700     protected boolean requestFocus(boolean temporary, FocusEvent.Cause cause) {
7701         return requestFocusHelper(temporary, true, cause);
7702     }
7703 
7704     /**
7705      * Requests that this Component get the input focus, if this
7706      * Component's top-level ancestor is already the focused
7707      * Window. This component must be displayable, focusable, visible
7708      * and all of its ancestors (with the exception of the top-level
7709      * Window) must be visible for the request to be granted. Every
7710      * effort will be made to honor the request; however, in some
7711      * cases it may be impossible to do so. Developers must never
7712      * assume that this Component is the focus owner until this
7713      * Component receives a FOCUS_GAINED event.
7714      * <p>
7715      * This method returns a boolean value. If {@code false} is returned,
7716      * the request is <b>guaranteed to fail</b>. If {@code true} is
7717      * returned, the request will succeed <b>unless</b> it is vetoed, or an
7718      * extraordinary event, such as disposal of the Component's peer, occurs
7719      * before the request can be granted by the native windowing system. Again,
7720      * while a return value of {@code true} indicates that the request is
7721      * likely to succeed, developers must never assume that this Component is
7722      * the focus owner until this Component receives a FOCUS_GAINED event.
7723      * <p>
7724      * This method cannot be used to set the focus owner to no Component at
7725      * all. Use {@code KeyboardFocusManager.clearGlobalFocusOwner()}
7726      * instead.
7727      * <p>
7728      * The focus behavior of this method can be implemented uniformly across
7729      * platforms, and thus developers are strongly encouraged to use this
7730      * method over {@code requestFocus} when possible. Code which relies
7731      * on {@code requestFocus} may exhibit different focus behavior on
7732      * different platforms.
7733      *
7734      * <p>Note: Not all focus transfers result from invoking this method. As
7735      * such, a component may receive focus without this or any of the other
7736      * {@code requestFocus} methods of {@code Component} being invoked.
7737      *
7738      * @return {@code false} if the focus change request is guaranteed to
7739      *         fail; {@code true} if it is likely to succeed
7740      * @see #requestFocus
7741      * @see java.awt.event.FocusEvent
7742      * @see #addFocusListener
7743      * @see #isFocusable
7744      * @see #isDisplayable
7745      * @see KeyboardFocusManager#clearGlobalFocusOwner
7746      * @since 1.4
7747      */
7748     public boolean requestFocusInWindow() {
7749         return requestFocusHelper(false, false);
7750     }
7751 
7752     /**
7753      * Requests by the reason of {@code cause} that this Component get the input
7754      * focus, if this Component's top-level ancestor is already the focused
7755      * Window. This component must be displayable, focusable, visible
7756      * and all of its ancestors (with the exception of the top-level
7757      * Window) must be visible for the request to be granted. Every
7758      * effort will be made to honor the request; however, in some
7759      * cases it may be impossible to do so. Developers must never
7760      * assume that this Component is the focus owner until this
7761      * Component receives a FOCUS_GAINED event.
7762      * <p>
7763      * This method returns a boolean value. If {@code false} is returned,
7764      * the request is <b>guaranteed to fail</b>. If {@code true} is
7765      * returned, the request will succeed <b>unless</b> it is vetoed, or an
7766      * extraordinary event, such as disposal of the Component's peer, occurs
7767      * before the request can be granted by the native windowing system. Again,
7768      * while a return value of {@code true} indicates that the request is
7769      * likely to succeed, developers must never assume that this Component is
7770      * the focus owner until this Component receives a FOCUS_GAINED event.
7771      * <p>
7772      * The focus request effect may also depend on the provided
7773      * cause value. If this request is succeed the {@code FocusEvent}
7774      * generated in the result will receive the cause value specified as the
7775      * argument of the method.
7776      * <p>
7777      * This method cannot be used to set the focus owner to no Component at
7778      * all. Use {@code KeyboardFocusManager.clearGlobalFocusOwner()}
7779      * instead.
7780      * <p>
7781      * The focus behavior of this method can be implemented uniformly across
7782      * platforms, and thus developers are strongly encouraged to use this
7783      * method over {@code requestFocus(FocusEvent.Cause)} when possible.
7784      * Code which relies on {@code requestFocus(FocusEvent.Cause)} may exhibit
7785      * different focus behavior on different platforms.
7786      *
7787      * <p>Note: Not all focus transfers result from invoking this method. As
7788      * such, a component may receive focus without this or any of the other
7789      * {@code requestFocus} methods of {@code Component} being invoked.
7790      *
7791      * @param  cause the cause why the focus is requested
7792      * @return {@code false} if the focus change request is guaranteed to
7793      *         fail; {@code true} if it is likely to succeed
7794      * @see #requestFocus(FocusEvent.Cause)
7795      * @see FocusEvent
7796      * @see FocusEvent.Cause
7797      * @see java.awt.event.FocusEvent
7798      * @see #addFocusListener
7799      * @see #isFocusable
7800      * @see #isDisplayable
7801      * @see KeyboardFocusManager#clearGlobalFocusOwner
7802      * @since 9
7803      */
7804     public boolean requestFocusInWindow(FocusEvent.Cause cause) {
7805         return requestFocusHelper(false, false, cause);
7806     }
7807 
7808     /**
7809      * Requests that this {@code Component} get the input focus,
7810      * if this {@code Component}'s top-level ancestor is already
7811      * the focused {@code Window}.  This component must be
7812      * displayable, focusable, visible and all of its ancestors (with
7813      * the exception of the top-level Window) must be visible for the
7814      * request to be granted. Every effort will be made to honor the
7815      * request; however, in some cases it may be impossible to do
7816      * so. Developers must never assume that this component is the
7817      * focus owner until this component receives a FOCUS_GAINED event.
7818      * <p>
7819      * This method returns a boolean value. If {@code false} is returned,
7820      * the request is <b>guaranteed to fail</b>. If {@code true} is
7821      * returned, the request will succeed <b>unless</b> it is vetoed, or an
7822      * extraordinary event, such as disposal of the component's peer, occurs
7823      * before the request can be granted by the native windowing system. Again,
7824      * while a return value of {@code true} indicates that the request is
7825      * likely to succeed, developers must never assume that this component is
7826      * the focus owner until this component receives a FOCUS_GAINED event.
7827      * <p>
7828      * This method cannot be used to set the focus owner to no component at
7829      * all. Use {@code KeyboardFocusManager.clearGlobalFocusOwner}
7830      * instead.
7831      * <p>
7832      * The focus behavior of this method can be implemented uniformly across
7833      * platforms, and thus developers are strongly encouraged to use this
7834      * method over {@code requestFocus} when possible. Code which relies
7835      * on {@code requestFocus} may exhibit different focus behavior on
7836      * different platforms.
7837      * <p>
7838      * Every effort will be made to ensure that {@code FocusEvent}s
7839      * generated as a
7840      * result of this request will have the specified temporary value. However,
7841      * because specifying an arbitrary temporary state may not be implementable
7842      * on all native windowing systems, correct behavior for this method can be
7843      * guaranteed only for lightweight components. This method is not intended
7844      * for general use, but exists instead as a hook for lightweight component
7845      * libraries, such as Swing.
7846      *
7847      * <p>Note: Not all focus transfers result from invoking this method. As
7848      * such, a component may receive focus without this or any of the other
7849      * {@code requestFocus} methods of {@code Component} being invoked.
7850      *
7851      * @param temporary true if the focus change is temporary,
7852      *        such as when the window loses the focus; for
7853      *        more information on temporary focus changes see the
7854      *<a href="../../java/awt/doc-files/FocusSpec.html">Focus Specification</a>
7855      * @return {@code false} if the focus change request is guaranteed to
7856      *         fail; {@code true} if it is likely to succeed
7857      * @see #requestFocus
7858      * @see java.awt.event.FocusEvent
7859      * @see #addFocusListener
7860      * @see #isFocusable
7861      * @see #isDisplayable
7862      * @see KeyboardFocusManager#clearGlobalFocusOwner
7863      * @since 1.4
7864      */
7865     protected boolean requestFocusInWindow(boolean temporary) {
7866         return requestFocusHelper(temporary, false);
7867     }
7868 
7869     boolean requestFocusInWindow(boolean temporary, FocusEvent.Cause cause) {
7870         return requestFocusHelper(temporary, false, cause);
7871     }
7872 
7873     final boolean requestFocusHelper(boolean temporary,
7874                                      boolean focusedWindowChangeAllowed) {
7875         return requestFocusHelper(temporary, focusedWindowChangeAllowed, FocusEvent.Cause.UNKNOWN);
7876     }
7877 
7878     final boolean requestFocusHelper(boolean temporary,
7879                                      boolean focusedWindowChangeAllowed,
7880                                      FocusEvent.Cause cause)
7881     {
7882         // 1) Check if the event being dispatched is a system-generated mouse event.
7883         AWTEvent currentEvent = EventQueue.getCurrentEvent();
7884         if (currentEvent instanceof MouseEvent &&
7885             SunToolkit.isSystemGenerated(currentEvent))
7886         {
7887             // 2) Sanity check: if the mouse event component source belongs to the same containing window.
7888             Component source = ((MouseEvent)currentEvent).getComponent();
7889             if (source == null || source.getContainingWindow() == getContainingWindow()) {
7890                 focusLog.finest("requesting focus by mouse event \"in window\"");
7891 
7892                 // If both the conditions are fulfilled the focus request should be strictly
7893                 // bounded by the toplevel window. It's assumed that the mouse event activates
7894                 // the window (if it wasn't active) and this makes it possible for a focus
7895                 // request with a strong in-window requirement to change focus in the bounds
7896                 // of the toplevel. If, by any means, due to asynchronous nature of the event
7897                 // dispatching mechanism, the window happens to be natively inactive by the time
7898                 // this focus request is eventually handled, it should not re-activate the
7899                 // toplevel. Otherwise the result may not meet user expectations. See 6981400.
7900                 focusedWindowChangeAllowed = false;
7901             }
7902         }
7903         if (!isRequestFocusAccepted(temporary, focusedWindowChangeAllowed, cause)) {
7904             if (focusLog.isLoggable(PlatformLogger.Level.FINEST)) {
7905                 focusLog.finest("requestFocus is not accepted");
7906             }
7907             return false;
7908         }
7909         // Update most-recent map
7910         KeyboardFocusManager.setMostRecentFocusOwner(this);
7911 
7912         Component window = this;
7913         while ( (window != null) && !(window instanceof Window)) {
7914             if (!window.isVisible()) {
7915                 if (focusLog.isLoggable(PlatformLogger.Level.FINEST)) {
7916                     focusLog.finest("component is recursively invisible");
7917                 }
7918                 return false;
7919             }
7920             window = window.parent;
7921         }
7922 
7923         ComponentPeer peer = this.peer;
7924         Component heavyweight = (peer instanceof LightweightPeer)
7925             ? getNativeContainer() : this;
7926         if (heavyweight == null || !heavyweight.isVisible()) {
7927             if (focusLog.isLoggable(PlatformLogger.Level.FINEST)) {
7928                 focusLog.finest("Component is not a part of visible hierarchy");
7929             }
7930             return false;
7931         }
7932         peer = heavyweight.peer;
7933         if (peer == null) {
7934             if (focusLog.isLoggable(PlatformLogger.Level.FINEST)) {
7935                 focusLog.finest("Peer is null");
7936             }
7937             return false;
7938         }
7939 
7940         // Focus this Component
7941         long time = 0;
7942         if (EventQueue.isDispatchThread()) {
7943             time = Toolkit.getEventQueue().getMostRecentKeyEventTime();
7944         } else {
7945             // A focus request made from outside EDT should not be associated with any event
7946             // and so its time stamp is simply set to the current time.
7947             time = System.currentTimeMillis();
7948         }
7949 
7950         boolean success = peer.requestFocus
7951             (this, temporary, focusedWindowChangeAllowed, time, cause);
7952         if (!success) {
7953             KeyboardFocusManager.getCurrentKeyboardFocusManager
7954                 (appContext).dequeueKeyEvents(time, this);
7955             if (focusLog.isLoggable(PlatformLogger.Level.FINEST)) {
7956                 focusLog.finest("Peer request failed");
7957             }
7958         } else {
7959             if (focusLog.isLoggable(PlatformLogger.Level.FINEST)) {
7960                 focusLog.finest("Pass for " + this);
7961             }
7962         }
7963         return success;
7964     }
7965 
7966     private boolean isRequestFocusAccepted(boolean temporary,
7967                                            boolean focusedWindowChangeAllowed,
7968                                            FocusEvent.Cause cause)
7969     {
7970         if (!isFocusable() || !isVisible()) {
7971             if (focusLog.isLoggable(PlatformLogger.Level.FINEST)) {
7972                 focusLog.finest("Not focusable or not visible");
7973             }
7974             return false;
7975         }
7976 
7977         ComponentPeer peer = this.peer;
7978         if (peer == null) {
7979             if (focusLog.isLoggable(PlatformLogger.Level.FINEST)) {
7980                 focusLog.finest("peer is null");
7981             }
7982             return false;
7983         }
7984 
7985         Window window = getContainingWindow();
7986         if (window == null || !window.isFocusableWindow()) {
7987             if (focusLog.isLoggable(PlatformLogger.Level.FINEST)) {
7988                 focusLog.finest("Component doesn't have toplevel");
7989             }
7990             return false;
7991         }
7992 
7993         // We have passed all regular checks for focus request,
7994         // now let's call RequestFocusController and see what it says.
7995         Component focusOwner = KeyboardFocusManager.getMostRecentFocusOwner(window);
7996         if (focusOwner == null) {
7997             // sometimes most recent focus owner may be null, but focus owner is not
7998             // e.g. we reset most recent focus owner if user removes focus owner
7999             focusOwner = KeyboardFocusManager.getCurrentKeyboardFocusManager().getFocusOwner();
8000             if (focusOwner != null && focusOwner.getContainingWindow() != window) {
8001                 focusOwner = null;
8002             }
8003         }
8004 
8005         if (focusOwner == this || focusOwner == null) {
8006             // Controller is supposed to verify focus transfers and for this it
8007             // should know both from and to components.  And it shouldn't verify
8008             // transfers from when these components are equal.
8009             if (focusLog.isLoggable(PlatformLogger.Level.FINEST)) {
8010                 focusLog.finest("focus owner is null or this");
8011             }
8012             return true;
8013         }
8014 
8015         if (FocusEvent.Cause.ACTIVATION == cause) {
8016             // we shouldn't call RequestFocusController in case we are
8017             // in activation.  We do request focus on component which
8018             // has got temporary focus lost and then on component which is
8019             // most recent focus owner.  But most recent focus owner can be
8020             // changed by requestFocusXXX() call only, so this transfer has
8021             // been already approved.
8022             if (focusLog.isLoggable(PlatformLogger.Level.FINEST)) {
8023                 focusLog.finest("cause is activation");
8024             }
8025             return true;
8026         }
8027 
8028         boolean ret = Component.requestFocusController.acceptRequestFocus(focusOwner,
8029                                                                           this,
8030                                                                           temporary,
8031                                                                           focusedWindowChangeAllowed,
8032                                                                           cause);
8033         if (focusLog.isLoggable(PlatformLogger.Level.FINEST)) {
8034             focusLog.finest("RequestFocusController returns {0}", ret);
8035         }
8036 
8037         return ret;
8038     }
8039 
8040     private static RequestFocusController requestFocusController = new DummyRequestFocusController();
8041 
8042     // Swing access this method through reflection to implement InputVerifier's functionality.
8043     // Perhaps, we should make this method public (later ;)
8044     private static class DummyRequestFocusController implements RequestFocusController {
8045         public boolean acceptRequestFocus(Component from, Component to,
8046                                           boolean temporary, boolean focusedWindowChangeAllowed,
8047                                           FocusEvent.Cause cause)
8048         {
8049             return true;
8050         }
8051     };
8052 
8053     static synchronized void setRequestFocusController(RequestFocusController requestController)
8054     {
8055         if (requestController == null) {
8056             requestFocusController = new DummyRequestFocusController();
8057         } else {
8058             requestFocusController = requestController;
8059         }
8060     }
8061 
8062     /**
8063      * Returns the Container which is the focus cycle root of this Component's
8064      * focus traversal cycle. Each focus traversal cycle has only a single
8065      * focus cycle root and each Component which is not a Container belongs to
8066      * only a single focus traversal cycle. Containers which are focus cycle
8067      * roots belong to two cycles: one rooted at the Container itself, and one
8068      * rooted at the Container's nearest focus-cycle-root ancestor. For such
8069      * Containers, this method will return the Container's nearest focus-cycle-
8070      * root ancestor.
8071      *
8072      * @return this Component's nearest focus-cycle-root ancestor
8073      * @see Container#isFocusCycleRoot()
8074      * @since 1.4
8075      */
8076     public Container getFocusCycleRootAncestor() {
8077         Container rootAncestor = this.parent;
8078         while (rootAncestor != null && !rootAncestor.isFocusCycleRoot()) {
8079             rootAncestor = rootAncestor.parent;
8080         }
8081         return rootAncestor;
8082     }
8083 
8084     /**
8085      * Returns whether the specified Container is the focus cycle root of this
8086      * Component's focus traversal cycle. Each focus traversal cycle has only
8087      * a single focus cycle root and each Component which is not a Container
8088      * belongs to only a single focus traversal cycle.
8089      *
8090      * @param container the Container to be tested
8091      * @return {@code true} if the specified Container is a focus-cycle-
8092      *         root of this Component; {@code false} otherwise
8093      * @see Container#isFocusCycleRoot()
8094      * @since 1.4
8095      */
8096     public boolean isFocusCycleRoot(Container container) {
8097         Container rootAncestor = getFocusCycleRootAncestor();
8098         return (rootAncestor == container);
8099     }
8100 
8101     Container getTraversalRoot() {
8102         return getFocusCycleRootAncestor();
8103     }
8104 
8105     /**
8106      * Transfers the focus to the next component, as though this Component were
8107      * the focus owner.
8108      * @see       #requestFocus()
8109      * @since     1.1
8110      */
8111     public void transferFocus() {
8112         nextFocus();
8113     }
8114 
8115     /**
8116      * @deprecated As of JDK version 1.1,
8117      * replaced by transferFocus().
8118      */
8119     @Deprecated
8120     public void nextFocus() {
8121         transferFocus(false);
8122     }
8123 
8124     boolean transferFocus(boolean clearOnFailure) {
8125         if (focusLog.isLoggable(PlatformLogger.Level.FINER)) {
8126             focusLog.finer("clearOnFailure = " + clearOnFailure);
8127         }
8128         Component toFocus = getNextFocusCandidate();
8129         boolean res = false;
8130         if (toFocus != null && !toFocus.isFocusOwner() && toFocus != this) {
8131             res = toFocus.requestFocusInWindow(FocusEvent.Cause.TRAVERSAL_FORWARD);
8132         }
8133         if (clearOnFailure && !res) {
8134             if (focusLog.isLoggable(PlatformLogger.Level.FINER)) {
8135                 focusLog.finer("clear global focus owner");
8136             }
8137             KeyboardFocusManager.getCurrentKeyboardFocusManager().clearGlobalFocusOwnerPriv();
8138         }
8139         if (focusLog.isLoggable(PlatformLogger.Level.FINER)) {
8140             focusLog.finer("returning result: " + res);
8141         }
8142         return res;
8143     }
8144 
8145     @SuppressWarnings("deprecation")
8146     final Component getNextFocusCandidate() {
8147         Container rootAncestor = getTraversalRoot();
8148         Component comp = this;
8149         while (rootAncestor != null &&
8150                !(rootAncestor.isShowing() && rootAncestor.canBeFocusOwner()))
8151         {
8152             comp = rootAncestor;
8153             rootAncestor = comp.getFocusCycleRootAncestor();
8154         }
8155         if (focusLog.isLoggable(PlatformLogger.Level.FINER)) {
8156             focusLog.finer("comp = " + comp + ", root = " + rootAncestor);
8157         }
8158         Component candidate = null;
8159         if (rootAncestor != null) {
8160             FocusTraversalPolicy policy = rootAncestor.getFocusTraversalPolicy();
8161             Component toFocus = policy.getComponentAfter(rootAncestor, comp);
8162             if (focusLog.isLoggable(PlatformLogger.Level.FINER)) {
8163                 focusLog.finer("component after is " + toFocus);
8164             }
8165             if (toFocus == null) {
8166                 toFocus = policy.getDefaultComponent(rootAncestor);
8167                 if (focusLog.isLoggable(PlatformLogger.Level.FINER)) {
8168                     focusLog.finer("default component is " + toFocus);
8169                 }
8170             }
8171             if (toFocus == null) {
8172                 Applet applet = EmbeddedFrame.getAppletIfAncestorOf(this);
8173                 if (applet != null) {
8174                     toFocus = applet;
8175                 }
8176             }
8177             candidate = toFocus;
8178         }
8179         if (focusLog.isLoggable(PlatformLogger.Level.FINER)) {
8180             focusLog.finer("Focus transfer candidate: " + candidate);
8181         }
8182         return candidate;
8183     }
8184 
8185     /**
8186      * Transfers the focus to the previous component, as though this Component
8187      * were the focus owner.
8188      * @see       #requestFocus()
8189      * @since     1.4
8190      */
8191     public void transferFocusBackward() {
8192         transferFocusBackward(false);
8193     }
8194 
8195     boolean transferFocusBackward(boolean clearOnFailure) {
8196         Container rootAncestor = getTraversalRoot();
8197         Component comp = this;
8198         while (rootAncestor != null &&
8199                !(rootAncestor.isShowing() && rootAncestor.canBeFocusOwner()))
8200         {
8201             comp = rootAncestor;
8202             rootAncestor = comp.getFocusCycleRootAncestor();
8203         }
8204         boolean res = false;
8205         if (rootAncestor != null) {
8206             FocusTraversalPolicy policy = rootAncestor.getFocusTraversalPolicy();
8207             Component toFocus = policy.getComponentBefore(rootAncestor, comp);
8208             if (toFocus == null) {
8209                 toFocus = policy.getDefaultComponent(rootAncestor);
8210             }
8211             if (toFocus != null) {
8212                 res = toFocus.requestFocusInWindow(FocusEvent.Cause.TRAVERSAL_BACKWARD);
8213             }
8214         }
8215         if (clearOnFailure && !res) {
8216             if (focusLog.isLoggable(PlatformLogger.Level.FINER)) {
8217                 focusLog.finer("clear global focus owner");
8218             }
8219             KeyboardFocusManager.getCurrentKeyboardFocusManager().clearGlobalFocusOwnerPriv();
8220         }
8221         if (focusLog.isLoggable(PlatformLogger.Level.FINER)) {
8222             focusLog.finer("returning result: " + res);
8223         }
8224         return res;
8225     }
8226 
8227     /**
8228      * Transfers the focus up one focus traversal cycle. Typically, the focus
8229      * owner is set to this Component's focus cycle root, and the current focus
8230      * cycle root is set to the new focus owner's focus cycle root. If,
8231      * however, this Component's focus cycle root is a Window, then the focus
8232      * owner is set to the focus cycle root's default Component to focus, and
8233      * the current focus cycle root is unchanged.
8234      *
8235      * @see       #requestFocus()
8236      * @see       Container#isFocusCycleRoot()
8237      * @see       Container#setFocusCycleRoot(boolean)
8238      * @since     1.4
8239      */
8240     public void transferFocusUpCycle() {
8241         Container rootAncestor;
8242         for (rootAncestor = getFocusCycleRootAncestor();
8243              rootAncestor != null && !(rootAncestor.isShowing() &&
8244                                        rootAncestor.isFocusable() &&
8245                                        rootAncestor.isEnabled());
8246              rootAncestor = rootAncestor.getFocusCycleRootAncestor()) {
8247         }
8248 
8249         if (rootAncestor != null) {
8250             Container rootAncestorRootAncestor =
8251                 rootAncestor.getFocusCycleRootAncestor();
8252             Container fcr = (rootAncestorRootAncestor != null) ?
8253                 rootAncestorRootAncestor : rootAncestor;
8254 
8255             KeyboardFocusManager.getCurrentKeyboardFocusManager().
8256                 setGlobalCurrentFocusCycleRootPriv(fcr);
8257             rootAncestor.requestFocus(FocusEvent.Cause.TRAVERSAL_UP);
8258         } else {
8259             Window window = getContainingWindow();
8260 
8261             if (window != null) {
8262                 Component toFocus = window.getFocusTraversalPolicy().
8263                     getDefaultComponent(window);
8264                 if (toFocus != null) {
8265                     KeyboardFocusManager.getCurrentKeyboardFocusManager().
8266                         setGlobalCurrentFocusCycleRootPriv(window);
8267                     toFocus.requestFocus(FocusEvent.Cause.TRAVERSAL_UP);
8268                 }
8269             }
8270         }
8271     }
8272 
8273     /**
8274      * Returns {@code true} if this {@code Component} is the
8275      * focus owner.  This method is obsolete, and has been replaced by
8276      * {@code isFocusOwner()}.
8277      *
8278      * @return {@code true} if this {@code Component} is the
8279      *         focus owner; {@code false} otherwise
8280      * @since 1.2
8281      */
8282     public boolean hasFocus() {
8283         return (KeyboardFocusManager.getCurrentKeyboardFocusManager().
8284                 getFocusOwner() == this);
8285     }
8286 
8287     /**
8288      * Returns {@code true} if this {@code Component} is the
8289      *    focus owner.
8290      *
8291      * @return {@code true} if this {@code Component} is the
8292      *     focus owner; {@code false} otherwise
8293      * @since 1.4
8294      */
8295     public boolean isFocusOwner() {
8296         return hasFocus();
8297     }
8298 
8299     /*
8300      * Used to disallow auto-focus-transfer on disposal of the focus owner
8301      * in the process of disposing its parent container.
8302      */
8303     private boolean autoFocusTransferOnDisposal = true;
8304 
8305     void setAutoFocusTransferOnDisposal(boolean value) {
8306         autoFocusTransferOnDisposal = value;
8307     }
8308 
8309     boolean isAutoFocusTransferOnDisposal() {
8310         return autoFocusTransferOnDisposal;
8311     }
8312 
8313     /**
8314      * Adds the specified popup menu to the component.
8315      * @param     popup the popup menu to be added to the component.
8316      * @see       #remove(MenuComponent)
8317      * @exception NullPointerException if {@code popup} is {@code null}
8318      * @since     1.1
8319      */
8320     public void add(PopupMenu popup) {
8321         synchronized (getTreeLock()) {
8322             if (popup.parent != null) {
8323                 popup.parent.remove(popup);
8324             }
8325             if (popups == null) {
8326                 popups = new Vector<PopupMenu>();
8327             }
8328             popups.addElement(popup);
8329             popup.parent = this;
8330 
8331             if (peer != null) {
8332                 if (popup.peer == null) {
8333                     popup.addNotify();
8334                 }
8335             }
8336         }
8337     }
8338 
8339     /**
8340      * Removes the specified popup menu from the component.
8341      * @param     popup the popup menu to be removed
8342      * @see       #add(PopupMenu)
8343      * @since     1.1
8344      */
8345     @SuppressWarnings("unchecked")
8346     public void remove(MenuComponent popup) {
8347         synchronized (getTreeLock()) {
8348             if (popups == null) {
8349                 return;
8350             }
8351             int index = popups.indexOf(popup);
8352             if (index >= 0) {
8353                 PopupMenu pmenu = (PopupMenu)popup;
8354                 if (pmenu.peer != null) {
8355                     pmenu.removeNotify();
8356                 }
8357                 pmenu.parent = null;
8358                 popups.removeElementAt(index);
8359                 if (popups.size() == 0) {
8360                     popups = null;
8361                 }
8362             }
8363         }
8364     }
8365 
8366     /**
8367      * Returns a string representing the state of this component. This
8368      * method is intended to be used only for debugging purposes, and the
8369      * content and format of the returned string may vary between
8370      * implementations. The returned string may be empty but may not be
8371      * {@code null}.
8372      *
8373      * @return  a string representation of this component's state
8374      * @since     1.0
8375      */
8376     protected String paramString() {
8377         final String thisName = Objects.toString(getName(), "");
8378         final String invalid = isValid() ? "" : ",invalid";
8379         final String hidden = visible ? "" : ",hidden";
8380         final String disabled = enabled ? "" : ",disabled";
8381         return thisName + ',' + x + ',' + y + ',' + width + 'x' + height
8382                 + invalid + hidden + disabled;
8383     }
8384 
8385     /**
8386      * Returns a string representation of this component and its values.
8387      * @return    a string representation of this component
8388      * @since     1.0
8389      */
8390     public String toString() {
8391         return getClass().getName() + '[' + paramString() + ']';
8392     }
8393 
8394     /**
8395      * Prints a listing of this component to the standard system output
8396      * stream {@code System.out}.
8397      * @see       java.lang.System#out
8398      * @since     1.0
8399      */
8400     public void list() {
8401         list(System.out, 0);
8402     }
8403 
8404     /**
8405      * Prints a listing of this component to the specified output
8406      * stream.
8407      * @param    out   a print stream
8408      * @throws   NullPointerException if {@code out} is {@code null}
8409      * @since    1.0
8410      */
8411     public void list(PrintStream out) {
8412         list(out, 0);
8413     }
8414 
8415     /**
8416      * Prints out a list, starting at the specified indentation, to the
8417      * specified print stream.
8418      * @param     out      a print stream
8419      * @param     indent   number of spaces to indent
8420      * @see       java.io.PrintStream#println(java.lang.Object)
8421      * @throws    NullPointerException if {@code out} is {@code null}
8422      * @since     1.0
8423      */
8424     public void list(PrintStream out, int indent) {
8425         for (int i = 0 ; i < indent ; i++) {
8426             out.print(" ");
8427         }
8428         out.println(this);
8429     }
8430 
8431     /**
8432      * Prints a listing to the specified print writer.
8433      * @param  out  the print writer to print to
8434      * @throws NullPointerException if {@code out} is {@code null}
8435      * @since 1.1
8436      */
8437     public void list(PrintWriter out) {
8438         list(out, 0);
8439     }
8440 
8441     /**
8442      * Prints out a list, starting at the specified indentation, to
8443      * the specified print writer.
8444      * @param out the print writer to print to
8445      * @param indent the number of spaces to indent
8446      * @throws NullPointerException if {@code out} is {@code null}
8447      * @see       java.io.PrintStream#println(java.lang.Object)
8448      * @since 1.1
8449      */
8450     public void list(PrintWriter out, int indent) {
8451         for (int i = 0 ; i < indent ; i++) {
8452             out.print(" ");
8453         }
8454         out.println(this);
8455     }
8456 
8457     /*
8458      * Fetches the native container somewhere higher up in the component
8459      * tree that contains this component.
8460      */
8461     final Container getNativeContainer() {
8462         Container p = getContainer();
8463         while (p != null && p.peer instanceof LightweightPeer) {
8464             p = p.getContainer();
8465         }
8466         return p;
8467     }
8468 
8469     /**
8470      * Adds a PropertyChangeListener to the listener list. The listener is
8471      * registered for all bound properties of this class, including the
8472      * following:
8473      * <ul>
8474      *    <li>this Component's font ("font")</li>
8475      *    <li>this Component's background color ("background")</li>
8476      *    <li>this Component's foreground color ("foreground")</li>
8477      *    <li>this Component's focusability ("focusable")</li>
8478      *    <li>this Component's focus traversal keys enabled state
8479      *        ("focusTraversalKeysEnabled")</li>
8480      *    <li>this Component's Set of FORWARD_TRAVERSAL_KEYS
8481      *        ("forwardFocusTraversalKeys")</li>
8482      *    <li>this Component's Set of BACKWARD_TRAVERSAL_KEYS
8483      *        ("backwardFocusTraversalKeys")</li>
8484      *    <li>this Component's Set of UP_CYCLE_TRAVERSAL_KEYS
8485      *        ("upCycleFocusTraversalKeys")</li>
8486      *    <li>this Component's preferred size ("preferredSize")</li>
8487      *    <li>this Component's minimum size ("minimumSize")</li>
8488      *    <li>this Component's maximum size ("maximumSize")</li>
8489      *    <li>this Component's name ("name")</li>
8490      * </ul>
8491      * Note that if this {@code Component} is inheriting a bound property, then no
8492      * event will be fired in response to a change in the inherited property.
8493      * <p>
8494      * If {@code listener} is {@code null},
8495      * no exception is thrown and no action is performed.
8496      *
8497      * @param    listener  the property change listener to be added
8498      *
8499      * @see #removePropertyChangeListener
8500      * @see #getPropertyChangeListeners
8501      * @see #addPropertyChangeListener(java.lang.String, java.beans.PropertyChangeListener)
8502      */
8503     public void addPropertyChangeListener(
8504                                                        PropertyChangeListener listener) {
8505         synchronized (getObjectLock()) {
8506             if (listener == null) {
8507                 return;
8508             }
8509             if (changeSupport == null) {
8510                 changeSupport = new PropertyChangeSupport(this);
8511             }
8512             changeSupport.addPropertyChangeListener(listener);
8513         }
8514     }
8515 
8516     /**
8517      * Removes a PropertyChangeListener from the listener list. This method
8518      * should be used to remove PropertyChangeListeners that were registered
8519      * for all bound properties of this class.
8520      * <p>
8521      * If listener is null, no exception is thrown and no action is performed.
8522      *
8523      * @param listener the PropertyChangeListener to be removed
8524      *
8525      * @see #addPropertyChangeListener
8526      * @see #getPropertyChangeListeners
8527      * @see #removePropertyChangeListener(java.lang.String,java.beans.PropertyChangeListener)
8528      */
8529     public void removePropertyChangeListener(
8530                                                           PropertyChangeListener listener) {
8531         synchronized (getObjectLock()) {
8532             if (listener == null || changeSupport == null) {
8533                 return;
8534             }
8535             changeSupport.removePropertyChangeListener(listener);
8536         }
8537     }
8538 
8539     /**
8540      * Returns an array of all the property change listeners
8541      * registered on this component.
8542      *
8543      * @return all of this component's {@code PropertyChangeListener}s
8544      *         or an empty array if no property change
8545      *         listeners are currently registered
8546      *
8547      * @see      #addPropertyChangeListener
8548      * @see      #removePropertyChangeListener
8549      * @see      #getPropertyChangeListeners(java.lang.String)
8550      * @see      java.beans.PropertyChangeSupport#getPropertyChangeListeners
8551      * @since    1.4
8552      */
8553     public PropertyChangeListener[] getPropertyChangeListeners() {
8554         synchronized (getObjectLock()) {
8555             if (changeSupport == null) {
8556                 return new PropertyChangeListener[0];
8557             }
8558             return changeSupport.getPropertyChangeListeners();
8559         }
8560     }
8561 
8562     /**
8563      * Adds a PropertyChangeListener to the listener list for a specific
8564      * property. The specified property may be user-defined, or one of the
8565      * following:
8566      * <ul>
8567      *    <li>this Component's font ("font")</li>
8568      *    <li>this Component's background color ("background")</li>
8569      *    <li>this Component's foreground color ("foreground")</li>
8570      *    <li>this Component's focusability ("focusable")</li>
8571      *    <li>this Component's focus traversal keys enabled state
8572      *        ("focusTraversalKeysEnabled")</li>
8573      *    <li>this Component's Set of FORWARD_TRAVERSAL_KEYS
8574      *        ("forwardFocusTraversalKeys")</li>
8575      *    <li>this Component's Set of BACKWARD_TRAVERSAL_KEYS
8576      *        ("backwardFocusTraversalKeys")</li>
8577      *    <li>this Component's Set of UP_CYCLE_TRAVERSAL_KEYS
8578      *        ("upCycleFocusTraversalKeys")</li>
8579      * </ul>
8580      * Note that if this {@code Component} is inheriting a bound property, then no
8581      * event will be fired in response to a change in the inherited property.
8582      * <p>
8583      * If {@code propertyName} or {@code listener} is {@code null},
8584      * no exception is thrown and no action is taken.
8585      *
8586      * @param propertyName one of the property names listed above
8587      * @param listener the property change listener to be added
8588      *
8589      * @see #removePropertyChangeListener(java.lang.String, java.beans.PropertyChangeListener)
8590      * @see #getPropertyChangeListeners(java.lang.String)
8591      * @see #addPropertyChangeListener(java.lang.String, java.beans.PropertyChangeListener)
8592      */
8593     public void addPropertyChangeListener(
8594                                                        String propertyName,
8595                                                        PropertyChangeListener listener) {
8596         synchronized (getObjectLock()) {
8597             if (listener == null) {
8598                 return;
8599             }
8600             if (changeSupport == null) {
8601                 changeSupport = new PropertyChangeSupport(this);
8602             }
8603             changeSupport.addPropertyChangeListener(propertyName, listener);
8604         }
8605     }
8606 
8607     /**
8608      * Removes a {@code PropertyChangeListener} from the listener
8609      * list for a specific property. This method should be used to remove
8610      * {@code PropertyChangeListener}s
8611      * that were registered for a specific bound property.
8612      * <p>
8613      * If {@code propertyName} or {@code listener} is {@code null},
8614      * no exception is thrown and no action is taken.
8615      *
8616      * @param propertyName a valid property name
8617      * @param listener the PropertyChangeListener to be removed
8618      *
8619      * @see #addPropertyChangeListener(java.lang.String, java.beans.PropertyChangeListener)
8620      * @see #getPropertyChangeListeners(java.lang.String)
8621      * @see #removePropertyChangeListener(java.beans.PropertyChangeListener)
8622      */
8623     public void removePropertyChangeListener(
8624                                                           String propertyName,
8625                                                           PropertyChangeListener listener) {
8626         synchronized (getObjectLock()) {
8627             if (listener == null || changeSupport == null) {
8628                 return;
8629             }
8630             changeSupport.removePropertyChangeListener(propertyName, listener);
8631         }
8632     }
8633 
8634     /**
8635      * Returns an array of all the listeners which have been associated
8636      * with the named property.
8637      *
8638      * @param  propertyName the property name
8639      * @return all of the {@code PropertyChangeListener}s associated with
8640      *         the named property; if no such listeners have been added or
8641      *         if {@code propertyName} is {@code null}, an empty
8642      *         array is returned
8643      *
8644      * @see #addPropertyChangeListener(java.lang.String, java.beans.PropertyChangeListener)
8645      * @see #removePropertyChangeListener(java.lang.String, java.beans.PropertyChangeListener)
8646      * @see #getPropertyChangeListeners
8647      * @since 1.4
8648      */
8649     public PropertyChangeListener[] getPropertyChangeListeners(String propertyName) {
8650         synchronized (getObjectLock()) {
8651             if (changeSupport == null) {
8652                 return new PropertyChangeListener[0];
8653             }
8654             return changeSupport.getPropertyChangeListeners(propertyName);
8655         }
8656     }
8657 
8658     /**
8659      * Support for reporting bound property changes for Object properties.
8660      * This method can be called when a bound property has changed and it will
8661      * send the appropriate PropertyChangeEvent to any registered
8662      * PropertyChangeListeners.
8663      *
8664      * @param propertyName the property whose value has changed
8665      * @param oldValue the property's previous value
8666      * @param newValue the property's new value
8667      */
8668     protected void firePropertyChange(String propertyName,
8669                                       Object oldValue, Object newValue) {
8670         PropertyChangeSupport changeSupport;
8671         synchronized (getObjectLock()) {
8672             changeSupport = this.changeSupport;
8673         }
8674         if (changeSupport == null ||
8675             (oldValue != null && newValue != null && oldValue.equals(newValue))) {
8676             return;
8677         }
8678         changeSupport.firePropertyChange(propertyName, oldValue, newValue);
8679     }
8680 
8681     /**
8682      * Support for reporting bound property changes for boolean properties.
8683      * This method can be called when a bound property has changed and it will
8684      * send the appropriate PropertyChangeEvent to any registered
8685      * PropertyChangeListeners.
8686      *
8687      * @param propertyName the property whose value has changed
8688      * @param oldValue the property's previous value
8689      * @param newValue the property's new value
8690      * @since 1.4
8691      */
8692     protected void firePropertyChange(String propertyName,
8693                                       boolean oldValue, boolean newValue) {
8694         PropertyChangeSupport changeSupport = this.changeSupport;
8695         if (changeSupport == null || oldValue == newValue) {
8696             return;
8697         }
8698         changeSupport.firePropertyChange(propertyName, oldValue, newValue);
8699     }
8700 
8701     /**
8702      * Support for reporting bound property changes for integer properties.
8703      * This method can be called when a bound property has changed and it will
8704      * send the appropriate PropertyChangeEvent to any registered
8705      * PropertyChangeListeners.
8706      *
8707      * @param propertyName the property whose value has changed
8708      * @param oldValue the property's previous value
8709      * @param newValue the property's new value
8710      * @since 1.4
8711      */
8712     protected void firePropertyChange(String propertyName,
8713                                       int oldValue, int newValue) {
8714         PropertyChangeSupport changeSupport = this.changeSupport;
8715         if (changeSupport == null || oldValue == newValue) {
8716             return;
8717         }
8718         changeSupport.firePropertyChange(propertyName, oldValue, newValue);
8719     }
8720 
8721     /**
8722      * Reports a bound property change.
8723      *
8724      * @param propertyName the programmatic name of the property
8725      *          that was changed
8726      * @param oldValue the old value of the property (as a byte)
8727      * @param newValue the new value of the property (as a byte)
8728      * @see #firePropertyChange(java.lang.String, java.lang.Object,
8729      *          java.lang.Object)
8730      * @since 1.5
8731      */
8732     public void firePropertyChange(String propertyName, byte oldValue, byte newValue) {
8733         if (changeSupport == null || oldValue == newValue) {
8734             return;
8735         }
8736         firePropertyChange(propertyName, Byte.valueOf(oldValue), Byte.valueOf(newValue));
8737     }
8738 
8739     /**
8740      * Reports a bound property change.
8741      *
8742      * @param propertyName the programmatic name of the property
8743      *          that was changed
8744      * @param oldValue the old value of the property (as a char)
8745      * @param newValue the new value of the property (as a char)
8746      * @see #firePropertyChange(java.lang.String, java.lang.Object,
8747      *          java.lang.Object)
8748      * @since 1.5
8749      */
8750     public void firePropertyChange(String propertyName, char oldValue, char newValue) {
8751         if (changeSupport == null || oldValue == newValue) {
8752             return;
8753         }
8754         firePropertyChange(propertyName, Character.valueOf(oldValue), Character.valueOf(newValue));
8755     }
8756 
8757     /**
8758      * Reports a bound property change.
8759      *
8760      * @param propertyName the programmatic name of the property
8761      *          that was changed
8762      * @param oldValue the old value of the property (as a short)
8763      * @param newValue the new value of the property (as a short)
8764      * @see #firePropertyChange(java.lang.String, java.lang.Object,
8765      *          java.lang.Object)
8766      * @since 1.5
8767      */
8768     public void firePropertyChange(String propertyName, short oldValue, short newValue) {
8769         if (changeSupport == null || oldValue == newValue) {
8770             return;
8771         }
8772         firePropertyChange(propertyName, Short.valueOf(oldValue), Short.valueOf(newValue));
8773     }
8774 
8775 
8776     /**
8777      * Reports a bound property change.
8778      *
8779      * @param propertyName the programmatic name of the property
8780      *          that was changed
8781      * @param oldValue the old value of the property (as a long)
8782      * @param newValue the new value of the property (as a long)
8783      * @see #firePropertyChange(java.lang.String, java.lang.Object,
8784      *          java.lang.Object)
8785      * @since 1.5
8786      */
8787     public void firePropertyChange(String propertyName, long oldValue, long newValue) {
8788         if (changeSupport == null || oldValue == newValue) {
8789             return;
8790         }
8791         firePropertyChange(propertyName, Long.valueOf(oldValue), Long.valueOf(newValue));
8792     }
8793 
8794     /**
8795      * Reports a bound property change.
8796      *
8797      * @param propertyName the programmatic name of the property
8798      *          that was changed
8799      * @param oldValue the old value of the property (as a float)
8800      * @param newValue the new value of the property (as a float)
8801      * @see #firePropertyChange(java.lang.String, java.lang.Object,
8802      *          java.lang.Object)
8803      * @since 1.5
8804      */
8805     public void firePropertyChange(String propertyName, float oldValue, float newValue) {
8806         if (changeSupport == null || oldValue == newValue) {
8807             return;
8808         }
8809         firePropertyChange(propertyName, Float.valueOf(oldValue), Float.valueOf(newValue));
8810     }
8811 
8812     /**
8813      * Reports a bound property change.
8814      *
8815      * @param propertyName the programmatic name of the property
8816      *          that was changed
8817      * @param oldValue the old value of the property (as a double)
8818      * @param newValue the new value of the property (as a double)
8819      * @see #firePropertyChange(java.lang.String, java.lang.Object,
8820      *          java.lang.Object)
8821      * @since 1.5
8822      */
8823     public void firePropertyChange(String propertyName, double oldValue, double newValue) {
8824         if (changeSupport == null || oldValue == newValue) {
8825             return;
8826         }
8827         firePropertyChange(propertyName, Double.valueOf(oldValue), Double.valueOf(newValue));
8828     }
8829 
8830 
8831     // Serialization support.
8832 
8833     /**
8834      * Component Serialized Data Version.
8835      *
8836      * @serial
8837      */
8838     private int componentSerializedDataVersion = 4;
8839 
8840     /**
8841      * This hack is for Swing serialization. It will invoke
8842      * the Swing package private method {@code compWriteObjectNotify}.
8843      */
8844     private void doSwingSerialization() {
8845         if (!(this instanceof JComponent)) {
8846             return;
8847         }
8848         @SuppressWarnings("deprecation")
8849         Package swingPackage = Package.getPackage("javax.swing");
8850         // For Swing serialization to correctly work Swing needs to
8851         // be notified before Component does it's serialization.  This
8852         // hack accommodates this.
8853         //
8854         // Swing classes MUST be loaded by the bootstrap class loader,
8855         // otherwise we don't consider them.
8856         for (Class<?> klass = Component.this.getClass(); klass != null;
8857                    klass = klass.getSuperclass()) {
8858             if (klass.getPackage() == swingPackage &&
8859                       klass.getClassLoader() == null) {
8860 
8861                 SwingAccessor.getJComponentAccessor()
8862                         .compWriteObjectNotify((JComponent) this);
8863                 return;
8864             }
8865         }
8866     }
8867 
8868     /**
8869      * Writes default serializable fields to stream.  Writes
8870      * a variety of serializable listeners as optional data.
8871      * The non-serializable listeners are detected and
8872      * no attempt is made to serialize them.
8873      *
8874      * @param s the {@code ObjectOutputStream} to write
8875      * @serialData {@code null} terminated sequence of
8876      *   0 or more pairs; the pair consists of a {@code String}
8877      *   and an {@code Object}; the {@code String} indicates
8878      *   the type of object and is one of the following (as of 1.4):
8879      *   {@code componentListenerK} indicating an
8880      *     {@code ComponentListener} object;
8881      *   {@code focusListenerK} indicating an
8882      *     {@code FocusListener} object;
8883      *   {@code keyListenerK} indicating an
8884      *     {@code KeyListener} object;
8885      *   {@code mouseListenerK} indicating an
8886      *     {@code MouseListener} object;
8887      *   {@code mouseMotionListenerK} indicating an
8888      *     {@code MouseMotionListener} object;
8889      *   {@code inputMethodListenerK} indicating an
8890      *     {@code InputMethodListener} object;
8891      *   {@code hierarchyListenerK} indicating an
8892      *     {@code HierarchyListener} object;
8893      *   {@code hierarchyBoundsListenerK} indicating an
8894      *     {@code HierarchyBoundsListener} object;
8895      *   {@code mouseWheelListenerK} indicating an
8896      *     {@code MouseWheelListener} object
8897      * @serialData an optional {@code ComponentOrientation}
8898      *    (after {@code inputMethodListener}, as of 1.2)
8899      *
8900      * @see AWTEventMulticaster#save(java.io.ObjectOutputStream, java.lang.String, java.util.EventListener)
8901      * @see #componentListenerK
8902      * @see #focusListenerK
8903      * @see #keyListenerK
8904      * @see #mouseListenerK
8905      * @see #mouseMotionListenerK
8906      * @see #inputMethodListenerK
8907      * @see #hierarchyListenerK
8908      * @see #hierarchyBoundsListenerK
8909      * @see #mouseWheelListenerK
8910      * @see #readObject(ObjectInputStream)
8911      */
8912     private void writeObject(ObjectOutputStream s)
8913       throws IOException
8914     {
8915         doSwingSerialization();
8916 
8917         s.defaultWriteObject();
8918 
8919         AWTEventMulticaster.save(s, componentListenerK, componentListener);
8920         AWTEventMulticaster.save(s, focusListenerK, focusListener);
8921         AWTEventMulticaster.save(s, keyListenerK, keyListener);
8922         AWTEventMulticaster.save(s, mouseListenerK, mouseListener);
8923         AWTEventMulticaster.save(s, mouseMotionListenerK, mouseMotionListener);
8924         AWTEventMulticaster.save(s, inputMethodListenerK, inputMethodListener);
8925 
8926         s.writeObject(null);
8927         s.writeObject(componentOrientation);
8928 
8929         AWTEventMulticaster.save(s, hierarchyListenerK, hierarchyListener);
8930         AWTEventMulticaster.save(s, hierarchyBoundsListenerK,
8931                                  hierarchyBoundsListener);
8932         s.writeObject(null);
8933 
8934         AWTEventMulticaster.save(s, mouseWheelListenerK, mouseWheelListener);
8935         s.writeObject(null);
8936 
8937     }
8938 
8939     /**
8940      * Reads the {@code ObjectInputStream} and if it isn't
8941      * {@code null} adds a listener to receive a variety
8942      * of events fired by the component.
8943      * Unrecognized keys or values will be ignored.
8944      *
8945      * @param s the {@code ObjectInputStream} to read
8946      * @see #writeObject(ObjectOutputStream)
8947      */
8948     private void readObject(ObjectInputStream s)
8949       throws ClassNotFoundException, IOException
8950     {
8951         objectLock = new Object();
8952 
8953         acc = AccessController.getContext();
8954 
8955         s.defaultReadObject();
8956 
8957         appContext = AppContext.getAppContext();
8958         coalescingEnabled = checkCoalescing();
8959         if (componentSerializedDataVersion < 4) {
8960             // These fields are non-transient and rely on default
8961             // serialization. However, the default values are insufficient,
8962             // so we need to set them explicitly for object data streams prior
8963             // to 1.4.
8964             focusable = true;
8965             isFocusTraversableOverridden = FOCUS_TRAVERSABLE_UNKNOWN;
8966             initializeFocusTraversalKeys();
8967             focusTraversalKeysEnabled = true;
8968         }
8969 
8970         Object keyOrNull;
8971         while(null != (keyOrNull = s.readObject())) {
8972             String key = ((String)keyOrNull).intern();
8973 
8974             if (componentListenerK == key)
8975                 addComponentListener((ComponentListener)(s.readObject()));
8976 
8977             else if (focusListenerK == key)
8978                 addFocusListener((FocusListener)(s.readObject()));
8979 
8980             else if (keyListenerK == key)
8981                 addKeyListener((KeyListener)(s.readObject()));
8982 
8983             else if (mouseListenerK == key)
8984                 addMouseListener((MouseListener)(s.readObject()));
8985 
8986             else if (mouseMotionListenerK == key)
8987                 addMouseMotionListener((MouseMotionListener)(s.readObject()));
8988 
8989             else if (inputMethodListenerK == key)
8990                 addInputMethodListener((InputMethodListener)(s.readObject()));
8991 
8992             else // skip value for unrecognized key
8993                 s.readObject();
8994 
8995         }
8996 
8997         // Read the component's orientation if it's present
8998         Object orient = null;
8999 
9000         try {
9001             orient = s.readObject();
9002         } catch (java.io.OptionalDataException e) {
9003             // JDK 1.1 instances will not have this optional data.
9004             // e.eof will be true to indicate that there is no more
9005             // data available for this object.
9006             // If e.eof is not true, throw the exception as it
9007             // might have been caused by reasons unrelated to
9008             // componentOrientation.
9009 
9010             if (!e.eof)  {
9011                 throw (e);
9012             }
9013         }
9014 
9015         if (orient != null) {
9016             componentOrientation = (ComponentOrientation)orient;
9017         } else {
9018             componentOrientation = ComponentOrientation.UNKNOWN;
9019         }
9020 
9021         try {
9022             while(null != (keyOrNull = s.readObject())) {
9023                 String key = ((String)keyOrNull).intern();
9024 
9025                 if (hierarchyListenerK == key) {
9026                     addHierarchyListener((HierarchyListener)(s.readObject()));
9027                 }
9028                 else if (hierarchyBoundsListenerK == key) {
9029                     addHierarchyBoundsListener((HierarchyBoundsListener)
9030                                                (s.readObject()));
9031                 }
9032                 else {
9033                     // skip value for unrecognized key
9034                     s.readObject();
9035                 }
9036             }
9037         } catch (java.io.OptionalDataException e) {
9038             // JDK 1.1/1.2 instances will not have this optional data.
9039             // e.eof will be true to indicate that there is no more
9040             // data available for this object.
9041             // If e.eof is not true, throw the exception as it
9042             // might have been caused by reasons unrelated to
9043             // hierarchy and hierarchyBounds listeners.
9044 
9045             if (!e.eof)  {
9046                 throw (e);
9047             }
9048         }
9049 
9050         try {
9051             while (null != (keyOrNull = s.readObject())) {
9052                 String key = ((String)keyOrNull).intern();
9053 
9054                 if (mouseWheelListenerK == key) {
9055                     addMouseWheelListener((MouseWheelListener)(s.readObject()));
9056                 }
9057                 else {
9058                     // skip value for unrecognized key
9059                     s.readObject();
9060                 }
9061             }
9062         } catch (java.io.OptionalDataException e) {
9063             // pre-1.3 instances will not have this optional data.
9064             // e.eof will be true to indicate that there is no more
9065             // data available for this object.
9066             // If e.eof is not true, throw the exception as it
9067             // might have been caused by reasons unrelated to
9068             // mouse wheel listeners
9069 
9070             if (!e.eof)  {
9071                 throw (e);
9072             }
9073         }
9074 
9075         if (popups != null) {
9076             int npopups = popups.size();
9077             for (int i = 0 ; i < npopups ; i++) {
9078                 PopupMenu popup = popups.elementAt(i);
9079                 popup.parent = this;
9080             }
9081         }
9082     }
9083 
9084     /**
9085      * Sets the language-sensitive orientation that is to be used to order
9086      * the elements or text within this component.  Language-sensitive
9087      * {@code LayoutManager} and {@code Component}
9088      * subclasses will use this property to
9089      * determine how to lay out and draw components.
9090      * <p>
9091      * At construction time, a component's orientation is set to
9092      * {@code ComponentOrientation.UNKNOWN},
9093      * indicating that it has not been specified
9094      * explicitly.  The UNKNOWN orientation behaves the same as
9095      * {@code ComponentOrientation.LEFT_TO_RIGHT}.
9096      * <p>
9097      * To set the orientation of a single component, use this method.
9098      * To set the orientation of an entire component
9099      * hierarchy, use
9100      * {@link #applyComponentOrientation applyComponentOrientation}.
9101      * <p>
9102      * This method changes layout-related information, and therefore,
9103      * invalidates the component hierarchy.
9104      *
9105      * @param  o the orientation to be set
9106      *
9107      * @see ComponentOrientation
9108      * @see #invalidate
9109      *
9110      * @author Laura Werner, IBM
9111      */
9112     public void setComponentOrientation(ComponentOrientation o) {
9113         ComponentOrientation oldValue = componentOrientation;
9114         componentOrientation = o;
9115 
9116         // This is a bound property, so report the change to
9117         // any registered listeners.  (Cheap if there are none.)
9118         firePropertyChange("componentOrientation", oldValue, o);
9119 
9120         // This could change the preferred size of the Component.
9121         invalidateIfValid();
9122     }
9123 
9124     /**
9125      * Retrieves the language-sensitive orientation that is to be used to order
9126      * the elements or text within this component.  {@code LayoutManager}
9127      * and {@code Component}
9128      * subclasses that wish to respect orientation should call this method to
9129      * get the component's orientation before performing layout or drawing.
9130      *
9131      * @return the orientation to order the elements or text
9132      * @see ComponentOrientation
9133      *
9134      * @author Laura Werner, IBM
9135      */
9136     public ComponentOrientation getComponentOrientation() {
9137         return componentOrientation;
9138     }
9139 
9140     /**
9141      * Sets the {@code ComponentOrientation} property of this component
9142      * and all components contained within it.
9143      * <p>
9144      * This method changes layout-related information, and therefore,
9145      * invalidates the component hierarchy.
9146      *
9147      *
9148      * @param orientation the new component orientation of this component and
9149      *        the components contained within it.
9150      * @exception NullPointerException if {@code orientation} is null.
9151      * @see #setComponentOrientation
9152      * @see #getComponentOrientation
9153      * @see #invalidate
9154      * @since 1.4
9155      */
9156     public void applyComponentOrientation(ComponentOrientation orientation) {
9157         if (orientation == null) {
9158             throw new NullPointerException();
9159         }
9160         setComponentOrientation(orientation);
9161     }
9162 
9163     final boolean canBeFocusOwner() {
9164         // It is enabled, visible, focusable.
9165         if (isEnabled() && isDisplayable() && isVisible() && isFocusable()) {
9166             return true;
9167         }
9168         return false;
9169     }
9170 
9171     /**
9172      * Checks that this component meets the prerequisites to be focus owner:
9173      * - it is enabled, visible, focusable
9174      * - it's parents are all enabled and showing
9175      * - top-level window is focusable
9176      * - if focus cycle root has DefaultFocusTraversalPolicy then it also checks that this policy accepts
9177      * this component as focus owner
9178      * @since 1.5
9179      */
9180     final boolean canBeFocusOwnerRecursively() {
9181         // - it is enabled, visible, focusable
9182         if (!canBeFocusOwner()) {
9183             return false;
9184         }
9185 
9186         // - it's parents are all enabled and showing
9187         synchronized(getTreeLock()) {
9188             if (parent != null) {
9189                 return parent.canContainFocusOwner(this);
9190             }
9191         }
9192         return true;
9193     }
9194 
9195     /**
9196      * Fix the location of the HW component in a LW container hierarchy.
9197      */
9198     final void relocateComponent() {
9199         synchronized (getTreeLock()) {
9200             if (peer == null) {
9201                 return;
9202             }
9203             int nativeX = x;
9204             int nativeY = y;
9205             for (Component cont = getContainer();
9206                     cont != null && cont.isLightweight();
9207                     cont = cont.getContainer())
9208             {
9209                 nativeX += cont.x;
9210                 nativeY += cont.y;
9211             }
9212             peer.setBounds(nativeX, nativeY, width, height,
9213                     ComponentPeer.SET_LOCATION);
9214         }
9215     }
9216 
9217     /**
9218      * Returns the {@code Window} ancestor of the component.
9219      * @return Window ancestor of the component or component by itself if it is Window;
9220      *         null, if component is not a part of window hierarchy
9221      */
9222     Window getContainingWindow() {
9223         return SunToolkit.getContainingWindow(this);
9224     }
9225 
9226     /**
9227      * Initialize JNI field and method IDs
9228      */
9229     private static native void initIDs();
9230 
9231     /*
9232      * --- Accessibility Support ---
9233      *
9234      *  Component will contain all of the methods in interface Accessible,
9235      *  though it won't actually implement the interface - that will be up
9236      *  to the individual objects which extend Component.
9237      */
9238 
9239     /**
9240      * The {@code AccessibleContext} associated with this {@code Component}.
9241      */
9242     protected AccessibleContext accessibleContext = null;
9243 
9244     /**
9245      * Gets the {@code AccessibleContext} associated
9246      * with this {@code Component}.
9247      * The method implemented by this base
9248      * class returns null.  Classes that extend {@code Component}
9249      * should implement this method to return the
9250      * {@code AccessibleContext} associated with the subclass.
9251      *
9252      *
9253      * @return the {@code AccessibleContext} of this
9254      *    {@code Component}
9255      * @since 1.3
9256      */
9257     public AccessibleContext getAccessibleContext() {
9258         return accessibleContext;
9259     }
9260 
9261     /**
9262      * Inner class of Component used to provide default support for
9263      * accessibility.  This class is not meant to be used directly by
9264      * application developers, but is instead meant only to be
9265      * subclassed by component developers.
9266      * <p>
9267      * The class used to obtain the accessible role for this object.
9268      * @since 1.3
9269      */
9270     protected abstract class AccessibleAWTComponent extends AccessibleContext
9271         implements Serializable, AccessibleComponent {
9272 
9273         private static final long serialVersionUID = 642321655757800191L;
9274 
9275         /**
9276          * Though the class is abstract, this should be called by
9277          * all sub-classes.
9278          */
9279         protected AccessibleAWTComponent() {
9280         }
9281 
9282         /**
9283          * Number of PropertyChangeListener objects registered. It's used
9284          * to add/remove ComponentListener and FocusListener to track
9285          * target Component's state.
9286          */
9287         private transient volatile int propertyListenersCount = 0;
9288 
9289         /**
9290          * A component listener to track show/hide/resize events
9291          * and convert them to PropertyChange events.
9292          */
9293         protected ComponentListener accessibleAWTComponentHandler = null;
9294 
9295         /**
9296          * A listener to track focus events
9297          * and convert them to PropertyChange events.
9298          */
9299         protected FocusListener accessibleAWTFocusHandler = null;
9300 
9301         /**
9302          * Fire PropertyChange listener, if one is registered,
9303          * when shown/hidden..
9304          * @since 1.3
9305          */
9306         protected class AccessibleAWTComponentHandler implements ComponentListener {
9307             public void componentHidden(ComponentEvent e)  {
9308                 if (accessibleContext != null) {
9309                     accessibleContext.firePropertyChange(
9310                                                          AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
9311                                                          AccessibleState.VISIBLE, null);
9312                 }
9313             }
9314 
9315             public void componentShown(ComponentEvent e)  {
9316                 if (accessibleContext != null) {
9317                     accessibleContext.firePropertyChange(
9318                                                          AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
9319                                                          null, AccessibleState.VISIBLE);
9320                 }
9321             }
9322 
9323             public void componentMoved(ComponentEvent e)  {
9324             }
9325 
9326             public void componentResized(ComponentEvent e)  {
9327             }
9328         } // inner class AccessibleAWTComponentHandler
9329 
9330 
9331         /**
9332          * Fire PropertyChange listener, if one is registered,
9333          * when focus events happen
9334          * @since 1.3
9335          */
9336         protected class AccessibleAWTFocusHandler implements FocusListener {
9337             public void focusGained(FocusEvent event) {
9338                 if (accessibleContext != null) {
9339                     accessibleContext.firePropertyChange(
9340                                                          AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
9341                                                          null, AccessibleState.FOCUSED);
9342                 }
9343             }
9344             public void focusLost(FocusEvent event) {
9345                 if (accessibleContext != null) {
9346                     accessibleContext.firePropertyChange(
9347                                                          AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
9348                                                          AccessibleState.FOCUSED, null);
9349                 }
9350             }
9351         }  // inner class AccessibleAWTFocusHandler
9352 
9353 
9354         /**
9355          * Adds a {@code PropertyChangeListener} to the listener list.
9356          *
9357          * @param listener  the property change listener to be added
9358          */
9359         public void addPropertyChangeListener(PropertyChangeListener listener) {
9360             if (accessibleAWTComponentHandler == null) {
9361                 accessibleAWTComponentHandler = new AccessibleAWTComponentHandler();
9362             }
9363             if (accessibleAWTFocusHandler == null) {
9364                 accessibleAWTFocusHandler = new AccessibleAWTFocusHandler();
9365             }
9366             if (propertyListenersCount++ == 0) {
9367                 Component.this.addComponentListener(accessibleAWTComponentHandler);
9368                 Component.this.addFocusListener(accessibleAWTFocusHandler);
9369             }
9370             super.addPropertyChangeListener(listener);
9371         }
9372 
9373         /**
9374          * Remove a PropertyChangeListener from the listener list.
9375          * This removes a PropertyChangeListener that was registered
9376          * for all properties.
9377          *
9378          * @param listener  The PropertyChangeListener to be removed
9379          */
9380         public void removePropertyChangeListener(PropertyChangeListener listener) {
9381             if (--propertyListenersCount == 0) {
9382                 Component.this.removeComponentListener(accessibleAWTComponentHandler);
9383                 Component.this.removeFocusListener(accessibleAWTFocusHandler);
9384             }
9385             super.removePropertyChangeListener(listener);
9386         }
9387 
9388         // AccessibleContext methods
9389         //
9390         /**
9391          * Gets the accessible name of this object.  This should almost never
9392          * return {@code java.awt.Component.getName()},
9393          * as that generally isn't a localized name,
9394          * and doesn't have meaning for the user.  If the
9395          * object is fundamentally a text object (e.g. a menu item), the
9396          * accessible name should be the text of the object (e.g. "save").
9397          * If the object has a tooltip, the tooltip text may also be an
9398          * appropriate String to return.
9399          *
9400          * @return the localized name of the object -- can be
9401          *         {@code null} if this
9402          *         object does not have a name
9403          * @see javax.accessibility.AccessibleContext#setAccessibleName
9404          */
9405         public String getAccessibleName() {
9406             return accessibleName;
9407         }
9408 
9409         /**
9410          * Gets the accessible description of this object.  This should be
9411          * a concise, localized description of what this object is - what
9412          * is its meaning to the user.  If the object has a tooltip, the
9413          * tooltip text may be an appropriate string to return, assuming
9414          * it contains a concise description of the object (instead of just
9415          * the name of the object - e.g. a "Save" icon on a toolbar that
9416          * had "save" as the tooltip text shouldn't return the tooltip
9417          * text as the description, but something like "Saves the current
9418          * text document" instead).
9419          *
9420          * @return the localized description of the object -- can be
9421          *        {@code null} if this object does not have a description
9422          * @see javax.accessibility.AccessibleContext#setAccessibleDescription
9423          */
9424         public String getAccessibleDescription() {
9425             return accessibleDescription;
9426         }
9427 
9428         /**
9429          * Gets the role of this object.
9430          *
9431          * @return an instance of {@code AccessibleRole}
9432          *      describing the role of the object
9433          * @see javax.accessibility.AccessibleRole
9434          */
9435         public AccessibleRole getAccessibleRole() {
9436             return AccessibleRole.AWT_COMPONENT;
9437         }
9438 
9439         /**
9440          * Gets the state of this object.
9441          *
9442          * @return an instance of {@code AccessibleStateSet}
9443          *       containing the current state set of the object
9444          * @see javax.accessibility.AccessibleState
9445          */
9446         public AccessibleStateSet getAccessibleStateSet() {
9447             return Component.this.getAccessibleStateSet();
9448         }
9449 
9450         /**
9451          * Gets the {@code Accessible} parent of this object.
9452          * If the parent of this object implements {@code Accessible},
9453          * this method should simply return {@code getParent}.
9454          *
9455          * @return the {@code Accessible} parent of this
9456          *      object -- can be {@code null} if this
9457          *      object does not have an {@code Accessible} parent
9458          */
9459         public Accessible getAccessibleParent() {
9460             if (accessibleParent != null) {
9461                 return accessibleParent;
9462             } else {
9463                 Container parent = getParent();
9464                 if (parent instanceof Accessible) {
9465                     return (Accessible) parent;
9466                 }
9467             }
9468             return null;
9469         }
9470 
9471         /**
9472          * Gets the index of this object in its accessible parent.
9473          *
9474          * @return the index of this object in its parent; or -1 if this
9475          *    object does not have an accessible parent
9476          * @see #getAccessibleParent
9477          */
9478         public int getAccessibleIndexInParent() {
9479             return Component.this.getAccessibleIndexInParent();
9480         }
9481 
9482         /**
9483          * Returns the number of accessible children in the object.  If all
9484          * of the children of this object implement {@code Accessible},
9485          * then this method should return the number of children of this object.
9486          *
9487          * @return the number of accessible children in the object
9488          */
9489         public int getAccessibleChildrenCount() {
9490             return 0; // Components don't have children
9491         }
9492 
9493         /**
9494          * Returns the nth {@code Accessible} child of the object.
9495          *
9496          * @param i zero-based index of child
9497          * @return the nth {@code Accessible} child of the object
9498          */
9499         public Accessible getAccessibleChild(int i) {
9500             return null; // Components don't have children
9501         }
9502 
9503         /**
9504          * Returns the locale of this object.
9505          *
9506          * @return the locale of this object
9507          */
9508         public Locale getLocale() {
9509             return Component.this.getLocale();
9510         }
9511 
9512         /**
9513          * Gets the {@code AccessibleComponent} associated
9514          * with this object if one exists.
9515          * Otherwise return {@code null}.
9516          *
9517          * @return the component
9518          */
9519         public AccessibleComponent getAccessibleComponent() {
9520             return this;
9521         }
9522 
9523 
9524         // AccessibleComponent methods
9525         //
9526         /**
9527          * Gets the background color of this object.
9528          *
9529          * @return the background color, if supported, of the object;
9530          *      otherwise, {@code null}
9531          */
9532         public Color getBackground() {
9533             return Component.this.getBackground();
9534         }
9535 
9536         /**
9537          * Sets the background color of this object.
9538          * (For transparency, see {@code isOpaque}.)
9539          *
9540          * @param c the new {@code Color} for the background
9541          * @see Component#isOpaque
9542          */
9543         public void setBackground(Color c) {
9544             Component.this.setBackground(c);
9545         }
9546 
9547         /**
9548          * Gets the foreground color of this object.
9549          *
9550          * @return the foreground color, if supported, of the object;
9551          *     otherwise, {@code null}
9552          */
9553         public Color getForeground() {
9554             return Component.this.getForeground();
9555         }
9556 
9557         /**
9558          * Sets the foreground color of this object.
9559          *
9560          * @param c the new {@code Color} for the foreground
9561          */
9562         public void setForeground(Color c) {
9563             Component.this.setForeground(c);
9564         }
9565 
9566         /**
9567          * Gets the {@code Cursor} of this object.
9568          *
9569          * @return the {@code Cursor}, if supported,
9570          *     of the object; otherwise, {@code null}
9571          */
9572         public Cursor getCursor() {
9573             return Component.this.getCursor();
9574         }
9575 
9576         /**
9577          * Sets the {@code Cursor} of this object.
9578          * <p>
9579          * The method may have no visual effect if the Java platform
9580          * implementation and/or the native system do not support
9581          * changing the mouse cursor shape.
9582          * @param cursor the new {@code Cursor} for the object
9583          */
9584         public void setCursor(Cursor cursor) {
9585             Component.this.setCursor(cursor);
9586         }
9587 
9588         /**
9589          * Gets the {@code Font} of this object.
9590          *
9591          * @return the {@code Font}, if supported,
9592          *    for the object; otherwise, {@code null}
9593          */
9594         public Font getFont() {
9595             return Component.this.getFont();
9596         }
9597 
9598         /**
9599          * Sets the {@code Font} of this object.
9600          *
9601          * @param f the new {@code Font} for the object
9602          */
9603         public void setFont(Font f) {
9604             Component.this.setFont(f);
9605         }
9606 
9607         /**
9608          * Gets the {@code FontMetrics} of this object.
9609          *
9610          * @param f the {@code Font}
9611          * @return the {@code FontMetrics}, if supported,
9612          *     the object; otherwise, {@code null}
9613          * @see #getFont
9614          */
9615         public FontMetrics getFontMetrics(Font f) {
9616             if (f == null) {
9617                 return null;
9618             } else {
9619                 return Component.this.getFontMetrics(f);
9620             }
9621         }
9622 
9623         /**
9624          * Determines if the object is enabled.
9625          *
9626          * @return true if object is enabled; otherwise, false
9627          */
9628         public boolean isEnabled() {
9629             return Component.this.isEnabled();
9630         }
9631 
9632         /**
9633          * Sets the enabled state of the object.
9634          *
9635          * @param b if true, enables this object; otherwise, disables it
9636          */
9637         public void setEnabled(boolean b) {
9638             boolean old = Component.this.isEnabled();
9639             Component.this.setEnabled(b);
9640             if (b != old) {
9641                 if (accessibleContext != null) {
9642                     if (b) {
9643                         accessibleContext.firePropertyChange(
9644                                                              AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
9645                                                              null, AccessibleState.ENABLED);
9646                     } else {
9647                         accessibleContext.firePropertyChange(
9648                                                              AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
9649                                                              AccessibleState.ENABLED, null);
9650                     }
9651                 }
9652             }
9653         }
9654 
9655         /**
9656          * Determines if the object is visible.  Note: this means that the
9657          * object intends to be visible; however, it may not in fact be
9658          * showing on the screen because one of the objects that this object
9659          * is contained by is not visible.  To determine if an object is
9660          * showing on the screen, use {@code isShowing}.
9661          *
9662          * @return true if object is visible; otherwise, false
9663          */
9664         public boolean isVisible() {
9665             return Component.this.isVisible();
9666         }
9667 
9668         /**
9669          * Sets the visible state of the object.
9670          *
9671          * @param b if true, shows this object; otherwise, hides it
9672          */
9673         public void setVisible(boolean b) {
9674             boolean old = Component.this.isVisible();
9675             Component.this.setVisible(b);
9676             if (b != old) {
9677                 if (accessibleContext != null) {
9678                     if (b) {
9679                         accessibleContext.firePropertyChange(
9680                                                              AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
9681                                                              null, AccessibleState.VISIBLE);
9682                     } else {
9683                         accessibleContext.firePropertyChange(
9684                                                              AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
9685                                                              AccessibleState.VISIBLE, null);
9686                     }
9687                 }
9688             }
9689         }
9690 
9691         /**
9692          * Determines if the object is showing.  This is determined by checking
9693          * the visibility of the object and ancestors of the object.  Note:
9694          * this will return true even if the object is obscured by another
9695          * (for example, it happens to be underneath a menu that was pulled
9696          * down).
9697          *
9698          * @return true if object is showing; otherwise, false
9699          */
9700         public boolean isShowing() {
9701             return Component.this.isShowing();
9702         }
9703 
9704         /**
9705          * Checks whether the specified point is within this object's bounds,
9706          * where the point's x and y coordinates are defined to be relative to
9707          * the coordinate system of the object.
9708          *
9709          * @param p the {@code Point} relative to the
9710          *     coordinate system of the object
9711          * @return true if object contains {@code Point}; otherwise false
9712          */
9713         public boolean contains(Point p) {
9714             return Component.this.contains(p);
9715         }
9716 
9717         /**
9718          * Returns the location of the object on the screen.
9719          *
9720          * @return location of object on screen -- can be
9721          *    {@code null} if this object is not on the screen
9722          */
9723         public Point getLocationOnScreen() {
9724             synchronized (Component.this.getTreeLock()) {
9725                 if (Component.this.isShowing()) {
9726                     return Component.this.getLocationOnScreen();
9727                 } else {
9728                     return null;
9729                 }
9730             }
9731         }
9732 
9733         /**
9734          * Gets the location of the object relative to the parent in the form
9735          * of a point specifying the object's top-left corner in the screen's
9736          * coordinate space.
9737          *
9738          * @return an instance of Point representing the top-left corner of
9739          * the object's bounds in the coordinate space of the screen;
9740          * {@code null} if this object or its parent are not on the screen
9741          */
9742         public Point getLocation() {
9743             return Component.this.getLocation();
9744         }
9745 
9746         /**
9747          * Sets the location of the object relative to the parent.
9748          * @param p  the coordinates of the object
9749          */
9750         public void setLocation(Point p) {
9751             Component.this.setLocation(p);
9752         }
9753 
9754         /**
9755          * Gets the bounds of this object in the form of a Rectangle object.
9756          * The bounds specify this object's width, height, and location
9757          * relative to its parent.
9758          *
9759          * @return a rectangle indicating this component's bounds;
9760          *   {@code null} if this object is not on the screen
9761          */
9762         public Rectangle getBounds() {
9763             return Component.this.getBounds();
9764         }
9765 
9766         /**
9767          * Sets the bounds of this object in the form of a
9768          * {@code Rectangle} object.
9769          * The bounds specify this object's width, height, and location
9770          * relative to its parent.
9771          *
9772          * @param r a rectangle indicating this component's bounds
9773          */
9774         public void setBounds(Rectangle r) {
9775             Component.this.setBounds(r);
9776         }
9777 
9778         /**
9779          * Returns the size of this object in the form of a
9780          * {@code Dimension} object. The height field of the
9781          * {@code Dimension} object contains this object's
9782          * height, and the width field of the {@code Dimension}
9783          * object contains this object's width.
9784          *
9785          * @return a {@code Dimension} object that indicates
9786          *     the size of this component; {@code null} if
9787          *     this object is not on the screen
9788          */
9789         public Dimension getSize() {
9790             return Component.this.getSize();
9791         }
9792 
9793         /**
9794          * Resizes this object so that it has width and height.
9795          *
9796          * @param d the dimension specifying the new size of the object
9797          */
9798         public void setSize(Dimension d) {
9799             Component.this.setSize(d);
9800         }
9801 
9802         /**
9803          * Returns the {@code Accessible} child,
9804          * if one exists, contained at the local
9805          * coordinate {@code Point}.  Otherwise returns
9806          * {@code null}.
9807          *
9808          * @param p the point defining the top-left corner of
9809          *      the {@code Accessible}, given in the
9810          *      coordinate space of the object's parent
9811          * @return the {@code Accessible}, if it exists,
9812          *      at the specified location; else {@code null}
9813          */
9814         public Accessible getAccessibleAt(Point p) {
9815             return null; // Components don't have children
9816         }
9817 
9818         /**
9819          * Returns whether this object can accept focus or not.
9820          *
9821          * @return true if object can accept focus; otherwise false
9822          */
9823         public boolean isFocusTraversable() {
9824             return Component.this.isFocusTraversable();
9825         }
9826 
9827         /**
9828          * Requests focus for this object.
9829          */
9830         public void requestFocus() {
9831             Component.this.requestFocus();
9832         }
9833 
9834         /**
9835          * Adds the specified focus listener to receive focus events from this
9836          * component.
9837          *
9838          * @param l the focus listener
9839          */
9840         public void addFocusListener(FocusListener l) {
9841             Component.this.addFocusListener(l);
9842         }
9843 
9844         /**
9845          * Removes the specified focus listener so it no longer receives focus
9846          * events from this component.
9847          *
9848          * @param l the focus listener
9849          */
9850         public void removeFocusListener(FocusListener l) {
9851             Component.this.removeFocusListener(l);
9852         }
9853 
9854     } // inner class AccessibleAWTComponent
9855 
9856 
9857     /**
9858      * Gets the index of this object in its accessible parent.
9859      * If this object does not have an accessible parent, returns
9860      * -1.
9861      *
9862      * @return the index of this object in its accessible parent
9863      */
9864     int getAccessibleIndexInParent() {
9865         synchronized (getTreeLock()) {
9866 
9867             AccessibleContext accContext = getAccessibleContext();
9868             if (accContext == null) {
9869                 return -1;
9870             }
9871 
9872             Accessible parent = accContext.getAccessibleParent();
9873             if (parent == null) {
9874                 return -1;
9875             }
9876 
9877             accContext = parent.getAccessibleContext();
9878             for (int i = 0; i < accContext.getAccessibleChildrenCount(); i++) {
9879                 if (this.equals(accContext.getAccessibleChild(i))) {
9880                     return i;
9881                 }
9882             }
9883 
9884             return -1;
9885         }
9886     }
9887 
9888     /**
9889      * Gets the current state set of this object.
9890      *
9891      * @return an instance of {@code AccessibleStateSet}
9892      *    containing the current state set of the object
9893      * @see AccessibleState
9894      */
9895     AccessibleStateSet getAccessibleStateSet() {
9896         synchronized (getTreeLock()) {
9897             AccessibleStateSet states = new AccessibleStateSet();
9898             if (this.isEnabled()) {
9899                 states.add(AccessibleState.ENABLED);
9900             }
9901             if (this.isFocusTraversable()) {
9902                 states.add(AccessibleState.FOCUSABLE);
9903             }
9904             if (this.isVisible()) {
9905                 states.add(AccessibleState.VISIBLE);
9906             }
9907             if (this.isShowing()) {
9908                 states.add(AccessibleState.SHOWING);
9909             }
9910             if (this.isFocusOwner()) {
9911                 states.add(AccessibleState.FOCUSED);
9912             }
9913             if (this instanceof Accessible) {
9914                 AccessibleContext ac = ((Accessible) this).getAccessibleContext();
9915                 if (ac != null) {
9916                     Accessible ap = ac.getAccessibleParent();
9917                     if (ap != null) {
9918                         AccessibleContext pac = ap.getAccessibleContext();
9919                         if (pac != null) {
9920                             AccessibleSelection as = pac.getAccessibleSelection();
9921                             if (as != null) {
9922                                 states.add(AccessibleState.SELECTABLE);
9923                                 int i = ac.getAccessibleIndexInParent();
9924                                 if (i >= 0) {
9925                                     if (as.isAccessibleChildSelected(i)) {
9926                                         states.add(AccessibleState.SELECTED);
9927                                     }
9928                                 }
9929                             }
9930                         }
9931                     }
9932                 }
9933             }
9934             if (Component.isInstanceOf(this, "javax.swing.JComponent")) {
9935                 if (((javax.swing.JComponent) this).isOpaque()) {
9936                     states.add(AccessibleState.OPAQUE);
9937                 }
9938             }
9939             return states;
9940         }
9941     }
9942 
9943     /**
9944      * Checks that the given object is instance of the given class.
9945      * @param obj Object to be checked
9946      * @param className The name of the class. Must be fully-qualified class name.
9947      * @return true, if this object is instanceof given class,
9948      *         false, otherwise, or if obj or className is null
9949      */
9950     static boolean isInstanceOf(Object obj, String className) {
9951         if (obj == null) return false;
9952         if (className == null) return false;
9953 
9954         Class<?> cls = obj.getClass();
9955         while (cls != null) {
9956             if (cls.getName().equals(className)) {
9957                 return true;
9958             }
9959             cls = cls.getSuperclass();
9960         }
9961         return false;
9962     }
9963 
9964 
9965     // ************************** MIXING CODE *******************************
9966 
9967     /**
9968      * Check whether we can trust the current bounds of the component.
9969      * The return value of false indicates that the container of the
9970      * component is invalid, and therefore needs to be laid out, which would
9971      * probably mean changing the bounds of its children.
9972      * Null-layout of the container or absence of the container mean
9973      * the bounds of the component are final and can be trusted.
9974      */
9975     final boolean areBoundsValid() {
9976         Container cont = getContainer();
9977         return cont == null || cont.isValid() || cont.getLayout() == null;
9978     }
9979 
9980     /**
9981      * Applies the shape to the component
9982      * @param shape Shape to be applied to the component
9983      */
9984     void applyCompoundShape(Region shape) {
9985         checkTreeLock();
9986 
9987         if (!areBoundsValid()) {
9988             if (mixingLog.isLoggable(PlatformLogger.Level.FINE)) {
9989                 mixingLog.fine("this = " + this + "; areBoundsValid = " + areBoundsValid());
9990             }
9991             return;
9992         }
9993 
9994         if (!isLightweight()) {
9995             ComponentPeer peer = this.peer;
9996             if (peer != null) {
9997                 // The Region class has some optimizations. That's why
9998                 // we should manually check whether it's empty and
9999                 // substitute the object ourselves. Otherwise we end up
10000                 // with some incorrect Region object with loX being
10001                 // greater than the hiX for instance.
10002                 if (shape.isEmpty()) {
10003                     shape = Region.EMPTY_REGION;
10004                 }
10005 
10006 
10007                 // Note: the shape is not really copied/cloned. We create
10008                 // the Region object ourselves, so there's no any possibility
10009                 // to modify the object outside of the mixing code.
10010                 // Nullifying compoundShape means that the component has normal shape
10011                 // (or has no shape at all).
10012                 if (shape.equals(getNormalShape())) {
10013                     if (this.compoundShape == null) {
10014                         return;
10015                     }
10016                     this.compoundShape = null;
10017                     peer.applyShape(null);
10018                 } else {
10019                     if (shape.equals(getAppliedShape())) {
10020                         return;
10021                     }
10022                     this.compoundShape = shape;
10023                     Point compAbsolute = getLocationOnWindow();
10024                     if (mixingLog.isLoggable(PlatformLogger.Level.FINER)) {
10025                         mixingLog.fine("this = " + this +
10026                                 "; compAbsolute=" + compAbsolute + "; shape=" + shape);
10027                     }
10028                     peer.applyShape(shape.getTranslatedRegion(-compAbsolute.x, -compAbsolute.y));
10029                 }
10030             }
10031         }
10032     }
10033 
10034     /**
10035      * Returns the shape previously set with applyCompoundShape().
10036      * If the component is LW or no shape was applied yet,
10037      * the method returns the normal shape.
10038      */
10039     private Region getAppliedShape() {
10040         checkTreeLock();
10041         //XXX: if we allow LW components to have a shape, this must be changed
10042         return (this.compoundShape == null || isLightweight()) ? getNormalShape() : this.compoundShape;
10043     }
10044 
10045     Point getLocationOnWindow() {
10046         checkTreeLock();
10047         Point curLocation = getLocation();
10048 
10049         for (Container parent = getContainer();
10050                 parent != null && !(parent instanceof Window);
10051                 parent = parent.getContainer())
10052         {
10053             curLocation.x += parent.getX();
10054             curLocation.y += parent.getY();
10055         }
10056 
10057         return curLocation;
10058     }
10059 
10060     /**
10061      * Returns the full shape of the component located in window coordinates
10062      */
10063     final Region getNormalShape() {
10064         checkTreeLock();
10065         //XXX: we may take into account a user-specified shape for this component
10066         Point compAbsolute = getLocationOnWindow();
10067         return
10068             Region.getInstanceXYWH(
10069                     compAbsolute.x,
10070                     compAbsolute.y,
10071                     getWidth(),
10072                     getHeight()
10073             );
10074     }
10075 
10076     /**
10077      * Returns the "opaque shape" of the component.
10078      *
10079      * The opaque shape of a lightweight components is the actual shape that
10080      * needs to be cut off of the heavyweight components in order to mix this
10081      * lightweight component correctly with them.
10082      *
10083      * The method is overriden in the java.awt.Container to handle non-opaque
10084      * containers containing opaque children.
10085      *
10086      * See 6637655 for details.
10087      */
10088     Region getOpaqueShape() {
10089         checkTreeLock();
10090         if (mixingCutoutRegion != null) {
10091             return mixingCutoutRegion;
10092         } else {
10093             return getNormalShape();
10094         }
10095     }
10096 
10097     final int getSiblingIndexAbove() {
10098         checkTreeLock();
10099         Container parent = getContainer();
10100         if (parent == null) {
10101             return -1;
10102         }
10103 
10104         int nextAbove = parent.getComponentZOrder(this) - 1;
10105 
10106         return nextAbove < 0 ? -1 : nextAbove;
10107     }
10108 
10109     final ComponentPeer getHWPeerAboveMe() {
10110         checkTreeLock();
10111 
10112         Container cont = getContainer();
10113         int indexAbove = getSiblingIndexAbove();
10114 
10115         while (cont != null) {
10116             for (int i = indexAbove; i > -1; i--) {
10117                 Component comp = cont.getComponent(i);
10118                 if (comp != null && comp.isDisplayable() && !comp.isLightweight()) {
10119                     return comp.peer;
10120                 }
10121             }
10122             // traversing the hierarchy up to the closest HW container;
10123             // further traversing may return a component that is not actually
10124             // a native sibling of this component and this kind of z-order
10125             // request may not be allowed by the underlying system (6852051).
10126             if (!cont.isLightweight()) {
10127                 break;
10128             }
10129 
10130             indexAbove = cont.getSiblingIndexAbove();
10131             cont = cont.getContainer();
10132         }
10133 
10134         return null;
10135     }
10136 
10137     final int getSiblingIndexBelow() {
10138         checkTreeLock();
10139         Container parent = getContainer();
10140         if (parent == null) {
10141             return -1;
10142         }
10143 
10144         int nextBelow = parent.getComponentZOrder(this) + 1;
10145 
10146         return nextBelow >= parent.getComponentCount() ? -1 : nextBelow;
10147     }
10148 
10149     final boolean isNonOpaqueForMixing() {
10150         return mixingCutoutRegion != null &&
10151             mixingCutoutRegion.isEmpty();
10152     }
10153 
10154     private Region calculateCurrentShape() {
10155         checkTreeLock();
10156         Region s = getNormalShape();
10157 
10158         if (mixingLog.isLoggable(PlatformLogger.Level.FINE)) {
10159             mixingLog.fine("this = " + this + "; normalShape=" + s);
10160         }
10161 
10162         if (getContainer() != null) {
10163             Component comp = this;
10164             Container cont = comp.getContainer();
10165 
10166             while (cont != null) {
10167                 for (int index = comp.getSiblingIndexAbove(); index != -1; --index) {
10168                     /* It is assumed that:
10169                      *
10170                      *    getComponent(getContainer().getComponentZOrder(comp)) == comp
10171                      *
10172                      * The assumption has been made according to the current
10173                      * implementation of the Container class.
10174                      */
10175                     Component c = cont.getComponent(index);
10176                     if (c.isLightweight() && c.isShowing()) {
10177                         s = s.getDifference(c.getOpaqueShape());
10178                     }
10179                 }
10180 
10181                 if (cont.isLightweight()) {
10182                     s = s.getIntersection(cont.getNormalShape());
10183                 } else {
10184                     break;
10185                 }
10186 
10187                 comp = cont;
10188                 cont = cont.getContainer();
10189             }
10190         }
10191 
10192         if (mixingLog.isLoggable(PlatformLogger.Level.FINE)) {
10193             mixingLog.fine("currentShape=" + s);
10194         }
10195 
10196         return s;
10197     }
10198 
10199     void applyCurrentShape() {
10200         checkTreeLock();
10201         if (!areBoundsValid()) {
10202             if (mixingLog.isLoggable(PlatformLogger.Level.FINE)) {
10203                 mixingLog.fine("this = " + this + "; areBoundsValid = " + areBoundsValid());
10204             }
10205             return; // Because applyCompoundShape() ignores such components anyway
10206         }
10207         if (mixingLog.isLoggable(PlatformLogger.Level.FINE)) {
10208             mixingLog.fine("this = " + this);
10209         }
10210         applyCompoundShape(calculateCurrentShape());
10211     }
10212 
10213     final void subtractAndApplyShape(Region s) {
10214         checkTreeLock();
10215 
10216         if (mixingLog.isLoggable(PlatformLogger.Level.FINE)) {
10217             mixingLog.fine("this = " + this + "; s=" + s);
10218         }
10219 
10220         applyCompoundShape(getAppliedShape().getDifference(s));
10221     }
10222 
10223     private final void applyCurrentShapeBelowMe() {
10224         checkTreeLock();
10225         Container parent = getContainer();
10226         if (parent != null && parent.isShowing()) {
10227             // First, reapply shapes of my siblings
10228             parent.recursiveApplyCurrentShape(getSiblingIndexBelow());
10229 
10230             // Second, if my container is non-opaque, reapply shapes of siblings of my container
10231             Container parent2 = parent.getContainer();
10232             while (!parent.isOpaque() && parent2 != null) {
10233                 parent2.recursiveApplyCurrentShape(parent.getSiblingIndexBelow());
10234 
10235                 parent = parent2;
10236                 parent2 = parent.getContainer();
10237             }
10238         }
10239     }
10240 
10241     final void subtractAndApplyShapeBelowMe() {
10242         checkTreeLock();
10243         Container parent = getContainer();
10244         if (parent != null && isShowing()) {
10245             Region opaqueShape = getOpaqueShape();
10246 
10247             // First, cut my siblings
10248             parent.recursiveSubtractAndApplyShape(opaqueShape, getSiblingIndexBelow());
10249 
10250             // Second, if my container is non-opaque, cut siblings of my container
10251             Container parent2 = parent.getContainer();
10252             while (!parent.isOpaque() && parent2 != null) {
10253                 parent2.recursiveSubtractAndApplyShape(opaqueShape, parent.getSiblingIndexBelow());
10254 
10255                 parent = parent2;
10256                 parent2 = parent.getContainer();
10257             }
10258         }
10259     }
10260 
10261     void mixOnShowing() {
10262         synchronized (getTreeLock()) {
10263             if (mixingLog.isLoggable(PlatformLogger.Level.FINE)) {
10264                 mixingLog.fine("this = " + this);
10265             }
10266             if (!isMixingNeeded()) {
10267                 return;
10268             }
10269             if (isLightweight()) {
10270                 subtractAndApplyShapeBelowMe();
10271             } else {
10272                 applyCurrentShape();
10273             }
10274         }
10275     }
10276 
10277     void mixOnHiding(boolean isLightweight) {
10278         // We cannot be sure that the peer exists at this point, so we need the argument
10279         //    to find out whether the hiding component is (well, actually was) a LW or a HW.
10280         synchronized (getTreeLock()) {
10281             if (mixingLog.isLoggable(PlatformLogger.Level.FINE)) {
10282                 mixingLog.fine("this = " + this + "; isLightweight = " + isLightweight);
10283             }
10284             if (!isMixingNeeded()) {
10285                 return;
10286             }
10287             if (isLightweight) {
10288                 applyCurrentShapeBelowMe();
10289             }
10290         }
10291     }
10292 
10293     void mixOnReshaping() {
10294         synchronized (getTreeLock()) {
10295             if (mixingLog.isLoggable(PlatformLogger.Level.FINE)) {
10296                 mixingLog.fine("this = " + this);
10297             }
10298             if (!isMixingNeeded()) {
10299                 return;
10300             }
10301             if (isLightweight()) {
10302                 applyCurrentShapeBelowMe();
10303             } else {
10304                 applyCurrentShape();
10305             }
10306         }
10307     }
10308 
10309     void mixOnZOrderChanging(int oldZorder, int newZorder) {
10310         synchronized (getTreeLock()) {
10311             boolean becameHigher = newZorder < oldZorder;
10312             Container parent = getContainer();
10313 
10314             if (mixingLog.isLoggable(PlatformLogger.Level.FINE)) {
10315                 mixingLog.fine("this = " + this +
10316                     "; oldZorder=" + oldZorder + "; newZorder=" + newZorder + "; parent=" + parent);
10317             }
10318             if (!isMixingNeeded()) {
10319                 return;
10320             }
10321             if (isLightweight()) {
10322                 if (becameHigher) {
10323                     if (parent != null && isShowing()) {
10324                         parent.recursiveSubtractAndApplyShape(getOpaqueShape(), getSiblingIndexBelow(), oldZorder);
10325                     }
10326                 } else {
10327                     if (parent != null) {
10328                         parent.recursiveApplyCurrentShape(oldZorder, newZorder);
10329                     }
10330                 }
10331             } else {
10332                 if (becameHigher) {
10333                     applyCurrentShape();
10334                 } else {
10335                     if (parent != null) {
10336                         Region shape = getAppliedShape();
10337 
10338                         for (int index = oldZorder; index < newZorder; index++) {
10339                             Component c = parent.getComponent(index);
10340                             if (c.isLightweight() && c.isShowing()) {
10341                                 shape = shape.getDifference(c.getOpaqueShape());
10342                             }
10343                         }
10344                         applyCompoundShape(shape);
10345                     }
10346                 }
10347             }
10348         }
10349     }
10350 
10351     void mixOnValidating() {
10352         // This method gets overriden in the Container. Obviously, a plain
10353         // non-container components don't need to handle validation.
10354     }
10355 
10356     final boolean isMixingNeeded() {
10357         if (SunToolkit.getSunAwtDisableMixing()) {
10358             if (mixingLog.isLoggable(PlatformLogger.Level.FINEST)) {
10359                 mixingLog.finest("this = " + this + "; Mixing disabled via sun.awt.disableMixing");
10360             }
10361             return false;
10362         }
10363         if (!areBoundsValid()) {
10364             if (mixingLog.isLoggable(PlatformLogger.Level.FINE)) {
10365                 mixingLog.fine("this = " + this + "; areBoundsValid = " + areBoundsValid());
10366             }
10367             return false;
10368         }
10369         Window window = getContainingWindow();
10370         if (window != null) {
10371             if (!window.hasHeavyweightDescendants() || !window.hasLightweightDescendants() || window.isDisposing()) {
10372                 if (mixingLog.isLoggable(PlatformLogger.Level.FINE)) {
10373                     mixingLog.fine("containing window = " + window +
10374                             "; has h/w descendants = " + window.hasHeavyweightDescendants() +
10375                             "; has l/w descendants = " + window.hasLightweightDescendants() +
10376                             "; disposing = " + window.isDisposing());
10377                 }
10378                 return false;
10379             }
10380         } else {
10381             if (mixingLog.isLoggable(PlatformLogger.Level.FINE)) {
10382                 mixingLog.fine("this = " + this + "; containing window is null");
10383             }
10384             return false;
10385         }
10386         return true;
10387     }
10388 
10389     /**
10390      * Sets a 'mixing-cutout' shape for this lightweight component.
10391      *
10392      * This method is used exclusively for the purposes of the
10393      * Heavyweight/Lightweight Components Mixing feature and will
10394      * have no effect if applied to a heavyweight component.
10395      *
10396      * By default a lightweight component is treated as an opaque rectangle for
10397      * the purposes of the Heavyweight/Lightweight Components Mixing feature.
10398      * This method enables developers to set an arbitrary shape to be cut out
10399      * from heavyweight components positioned underneath the lightweight
10400      * component in the z-order.
10401      * <p>
10402      * The {@code shape} argument may have the following values:
10403      * <ul>
10404      * <li>{@code null} - reverts the default cutout shape (the rectangle equal
10405      * to the component's {@code getBounds()})
10406      * <li><i>empty-shape</i> - does not cut out anything from heavyweight
10407      * components. This makes this lightweight component effectively
10408      * transparent. Note that descendants of the lightweight component still
10409      * affect the shapes of heavyweight components.  An example of an
10410      * <i>empty-shape</i> is {@code new Rectangle()}.
10411      * <li><i>non-empty-shape</i> - the given shape will be cut out from
10412      * heavyweight components.
10413      * </ul>
10414      * <p>
10415      * The most common example when the 'mixing-cutout' shape is needed is a
10416      * glass pane component. The {@link JRootPane#setGlassPane} method
10417      * automatically sets the <i>empty-shape</i> as the 'mixing-cutout' shape
10418      * for the given glass pane component.  If a developer needs some other
10419      * 'mixing-cutout' shape for the glass pane (which is rare), this must be
10420      * changed manually after installing the glass pane to the root pane.
10421      *
10422      * @param shape the new 'mixing-cutout' shape
10423      * @since 9
10424      */
10425     public void setMixingCutoutShape(Shape shape) {
10426         Region region = shape == null ? null : Region.getInstance(shape, null);
10427 
10428         synchronized (getTreeLock()) {
10429             boolean needShowing = false;
10430             boolean needHiding = false;
10431 
10432             if (!isNonOpaqueForMixing()) {
10433                 needHiding = true;
10434             }
10435 
10436             mixingCutoutRegion = region;
10437 
10438             if (!isNonOpaqueForMixing()) {
10439                 needShowing = true;
10440             }
10441 
10442             if (isMixingNeeded()) {
10443                 if (needHiding) {
10444                     mixOnHiding(isLightweight());
10445                 }
10446                 if (needShowing) {
10447                     mixOnShowing();
10448                 }
10449             }
10450         }
10451     }
10452 
10453     // ****************** END OF MIXING CODE ********************************
10454 
10455     // Note that the method is overriden in the Window class,
10456     // a window doesn't need to be updated in the Z-order.
10457     void updateZOrder() {
10458         peer.setZOrder(getHWPeerAboveMe());
10459     }
10460 
10461 }