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