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