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