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 to be used for double buffering.
3632      *
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 {@code null} value if the component is not
3637      *         displayable or {@code GraphicsEnvironment.isHeadless()} returns
3638      *         {@code true}.
3639      * @see #isDisplayable
3640      * @see GraphicsEnvironment#isHeadless
3641      * @since 1.0
3642      */
3643     public Image createImage(int width, int height) {
3644         ComponentPeer peer = this.peer;
3645         if (peer instanceof LightweightPeer) {
3646             if (parent != null) { return parent.createImage(width, height); }
3647             else { return null;}
3648         } else {
3649             return (peer != null) ? peer.createImage(width, height) : null;
3650         }
3651     }
3652 
3653     /**
3654      * Creates a volatile off-screen drawable image to be used for double
3655      * buffering.
3656      *
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 {@code null} value if the component is not
3661      *         displayable or {@code GraphicsEnvironment.isHeadless()} returns
3662      *         {@code true}.
3663      * @see java.awt.image.VolatileImage
3664      * @see #isDisplayable
3665      * @see GraphicsEnvironment#isHeadless
3666      * @since 1.4
3667      */
3668     public VolatileImage createVolatileImage(int width, int height) {
3669         ComponentPeer peer = this.peer;
3670         if (peer instanceof LightweightPeer) {
3671             if (parent != null) {
3672                 return parent.createVolatileImage(width, height);
3673             }
3674             else { return null;}
3675         } else {
3676             return (peer != null) ?
3677                 peer.createVolatileImage(width, height) : null;
3678         }
3679     }
3680 
3681     /**
3682      * Creates a volatile off-screen drawable image, with the given
3683      * capabilities. The contents of this image may be lost at any time due to
3684      * operating system issues, so the image must be managed via the
3685      * {@code VolatileImage} interface.
3686      *
3687      * @param  width the specified width
3688      * @param  height the specified height
3689      * @param  caps the image capabilities
3690      * @return a VolatileImage object, which can be used to manage surface
3691      *         contents loss and capabilities. The {@code null} value if the
3692      *         component is not displayable or
3693      *         {@code GraphicsEnvironment.isHeadless()} returns {@code true}.
3694      * @throws AWTException if an image with the specified capabilities cannot
3695      *         be created
3696      * @see java.awt.image.VolatileImage
3697      * @since 1.4
3698      */
3699     public VolatileImage createVolatileImage(int width, int height,
3700                                              ImageCapabilities caps)
3701             throws AWTException {
3702         // REMIND : check caps
3703         return createVolatileImage(width, height);
3704     }
3705 
3706     /**
3707      * Prepares an image for rendering on this component.  The image
3708      * data is downloaded asynchronously in another thread and the
3709      * appropriate screen representation of the image is generated.
3710      * @param     image   the <code>Image</code> for which to
3711      *                    prepare a screen representation
3712      * @param     observer   the <code>ImageObserver</code> object
3713      *                       to be notified as the image is being prepared
3714      * @return    <code>true</code> if the image has already been fully
3715      *           prepared; <code>false</code> otherwise
3716      * @since     1.0
3717      */
3718     public boolean prepareImage(Image image, ImageObserver observer) {
3719         return prepareImage(image, -1, -1, observer);
3720     }
3721 
3722     /**
3723      * Prepares an image for rendering on this component at the
3724      * specified width and height.
3725      * <p>
3726      * The image data is downloaded asynchronously in another thread,
3727      * and an appropriately scaled screen representation of the image is
3728      * generated.
3729      * @param     image    the instance of <code>Image</code>
3730      *            for which to prepare a screen representation
3731      * @param     width    the width of the desired screen representation
3732      * @param     height   the height of the desired screen representation
3733      * @param     observer   the <code>ImageObserver</code> object
3734      *            to be notified as the image is being prepared
3735      * @return    <code>true</code> if the image has already been fully
3736      *          prepared; <code>false</code> otherwise
3737      * @see       java.awt.image.ImageObserver
3738      * @since     1.0
3739      */
3740     public boolean prepareImage(Image image, int width, int height,
3741                                 ImageObserver observer) {
3742         ComponentPeer peer = this.peer;
3743         if (peer instanceof LightweightPeer) {
3744             return (parent != null)
3745                 ? parent.prepareImage(image, width, height, observer)
3746                 : getToolkit().prepareImage(image, width, height, observer);
3747         } else {
3748             return (peer != null)
3749                 ? peer.prepareImage(image, width, height, observer)
3750                 : getToolkit().prepareImage(image, width, height, observer);
3751         }
3752     }
3753 
3754     /**
3755      * Returns the status of the construction of a screen representation
3756      * of the specified image.
3757      * <p>
3758      * This method does not cause the image to begin loading. An
3759      * application must use the <code>prepareImage</code> method
3760      * to force the loading of an image.
3761      * <p>
3762      * Information on the flags returned by this method can be found
3763      * with the discussion of the <code>ImageObserver</code> interface.
3764      * @param     image   the <code>Image</code> object whose status
3765      *            is being checked
3766      * @param     observer   the <code>ImageObserver</code>
3767      *            object to be notified as the image is being prepared
3768      * @return  the bitwise inclusive <b>OR</b> of
3769      *            <code>ImageObserver</code> flags indicating what
3770      *            information about the image is currently available
3771      * @see      #prepareImage(Image, int, int, java.awt.image.ImageObserver)
3772      * @see      Toolkit#checkImage(Image, int, int, java.awt.image.ImageObserver)
3773      * @see      java.awt.image.ImageObserver
3774      * @since    1.0
3775      */
3776     public int checkImage(Image image, ImageObserver observer) {
3777         return checkImage(image, -1, -1, observer);
3778     }
3779 
3780     /**
3781      * Returns the status of the construction of a screen representation
3782      * of the specified image.
3783      * <p>
3784      * This method does not cause the image to begin loading. An
3785      * application must use the <code>prepareImage</code> method
3786      * to force the loading of an image.
3787      * <p>
3788      * The <code>checkImage</code> method of <code>Component</code>
3789      * calls its peer's <code>checkImage</code> method to calculate
3790      * the flags. If this component does not yet have a peer, the
3791      * component's toolkit's <code>checkImage</code> method is called
3792      * instead.
3793      * <p>
3794      * Information on the flags returned by this method can be found
3795      * with the discussion of the <code>ImageObserver</code> interface.
3796      * @param     image   the <code>Image</code> object whose status
3797      *                    is being checked
3798      * @param     width   the width of the scaled version
3799      *                    whose status is to be checked
3800      * @param     height  the height of the scaled version
3801      *                    whose status is to be checked
3802      * @param     observer   the <code>ImageObserver</code> object
3803      *                    to be notified as the image is being prepared
3804      * @return    the bitwise inclusive <b>OR</b> of
3805      *            <code>ImageObserver</code> flags indicating what
3806      *            information about the image is currently available
3807      * @see      #prepareImage(Image, int, int, java.awt.image.ImageObserver)
3808      * @see      Toolkit#checkImage(Image, int, int, java.awt.image.ImageObserver)
3809      * @see      java.awt.image.ImageObserver
3810      * @since    1.0
3811      */
3812     public int checkImage(Image image, int width, int height,
3813                           ImageObserver observer) {
3814         ComponentPeer peer = this.peer;
3815         if (peer instanceof LightweightPeer) {
3816             return (parent != null)
3817                 ? parent.checkImage(image, width, height, observer)
3818                 : getToolkit().checkImage(image, width, height, observer);
3819         } else {
3820             return (peer != null)
3821                 ? peer.checkImage(image, width, height, observer)
3822                 : getToolkit().checkImage(image, width, height, observer);
3823         }
3824     }
3825 
3826     /**
3827      * Creates a new strategy for multi-buffering on this component.
3828      * Multi-buffering is useful for rendering performance.  This method
3829      * attempts to create the best strategy available with the number of
3830      * buffers supplied.  It will always create a <code>BufferStrategy</code>
3831      * with that number of buffers.
3832      * A page-flipping strategy is attempted first, then a blitting strategy
3833      * using accelerated buffers.  Finally, an unaccelerated blitting
3834      * strategy is used.
3835      * <p>
3836      * Each time this method is called,
3837      * the existing buffer strategy for this component is discarded.
3838      * @param numBuffers number of buffers to create, including the front buffer
3839      * @exception IllegalArgumentException if numBuffers is less than 1.
3840      * @exception IllegalStateException if the component is not displayable
3841      * @see #isDisplayable
3842      * @see Window#getBufferStrategy()
3843      * @see Canvas#getBufferStrategy()
3844      * @since 1.4
3845      */
3846     void createBufferStrategy(int numBuffers) {
3847         BufferCapabilities bufferCaps;
3848         if (numBuffers > 1) {
3849             // Try to create a page-flipping strategy
3850             bufferCaps = new BufferCapabilities(new ImageCapabilities(true),
3851                                                 new ImageCapabilities(true),
3852                                                 BufferCapabilities.FlipContents.UNDEFINED);
3853             try {
3854                 createBufferStrategy(numBuffers, bufferCaps);
3855                 return; // Success
3856             } catch (AWTException e) {
3857                 // Failed
3858             }
3859         }
3860         // Try a blitting (but still accelerated) strategy
3861         bufferCaps = new BufferCapabilities(new ImageCapabilities(true),
3862                                             new ImageCapabilities(true),
3863                                             null);
3864         try {
3865             createBufferStrategy(numBuffers, bufferCaps);
3866             return; // Success
3867         } catch (AWTException e) {
3868             // Failed
3869         }
3870         // Try an unaccelerated blitting strategy
3871         bufferCaps = new BufferCapabilities(new ImageCapabilities(false),
3872                                             new ImageCapabilities(false),
3873                                             null);
3874         try {
3875             createBufferStrategy(numBuffers, bufferCaps);
3876             return; // Success
3877         } catch (AWTException e) {
3878             // Code should never reach here (an unaccelerated blitting
3879             // strategy should always work)
3880             throw new InternalError("Could not create a buffer strategy", e);
3881         }
3882     }
3883 
3884     /**
3885      * Creates a new strategy for multi-buffering on this component with the
3886      * required buffer capabilities.  This is useful, for example, if only
3887      * accelerated memory or page flipping is desired (as specified by the
3888      * buffer capabilities).
3889      * <p>
3890      * Each time this method
3891      * is called, <code>dispose</code> will be invoked on the existing
3892      * <code>BufferStrategy</code>.
3893      * @param numBuffers number of buffers to create
3894      * @param caps the required capabilities for creating the buffer strategy;
3895      * cannot be <code>null</code>
3896      * @exception AWTException if the capabilities supplied could not be
3897      * supported or met; this may happen, for example, if there is not enough
3898      * accelerated memory currently available, or if page flipping is specified
3899      * but not possible.
3900      * @exception IllegalArgumentException if numBuffers is less than 1, or if
3901      * caps is <code>null</code>
3902      * @see Window#getBufferStrategy()
3903      * @see Canvas#getBufferStrategy()
3904      * @since 1.4
3905      */
3906     void createBufferStrategy(int numBuffers,
3907                               BufferCapabilities caps) throws AWTException {
3908         // Check arguments
3909         if (numBuffers < 1) {
3910             throw new IllegalArgumentException(
3911                 "Number of buffers must be at least 1");
3912         }
3913         if (caps == null) {
3914             throw new IllegalArgumentException("No capabilities specified");
3915         }
3916         // Destroy old buffers
3917         if (bufferStrategy != null) {
3918             bufferStrategy.dispose();
3919         }
3920         if (numBuffers == 1) {
3921             bufferStrategy = new SingleBufferStrategy(caps);
3922         } else {
3923             SunGraphicsEnvironment sge = (SunGraphicsEnvironment)
3924                 GraphicsEnvironment.getLocalGraphicsEnvironment();
3925             if (!caps.isPageFlipping() && sge.isFlipStrategyPreferred(peer)) {
3926                 caps = new ProxyCapabilities(caps);
3927             }
3928             // assert numBuffers > 1;
3929             if (caps.isPageFlipping()) {
3930                 bufferStrategy = new FlipSubRegionBufferStrategy(numBuffers, caps);
3931             } else {
3932                 bufferStrategy = new BltSubRegionBufferStrategy(numBuffers, caps);
3933             }
3934         }
3935     }
3936 
3937     /**
3938      * This is a proxy capabilities class used when a FlipBufferStrategy
3939      * is created instead of the requested Blit strategy.
3940      *
3941      * @see sun.java2d.SunGraphicsEnvironment#isFlipStrategyPreferred(ComponentPeer)
3942      */
3943     private class ProxyCapabilities extends ExtendedBufferCapabilities {
3944         private BufferCapabilities orig;
3945         private ProxyCapabilities(BufferCapabilities orig) {
3946             super(orig.getFrontBufferCapabilities(),
3947                   orig.getBackBufferCapabilities(),
3948                   orig.getFlipContents() ==
3949                       BufferCapabilities.FlipContents.BACKGROUND ?
3950                       BufferCapabilities.FlipContents.BACKGROUND :
3951                       BufferCapabilities.FlipContents.COPIED);
3952             this.orig = orig;
3953         }
3954     }
3955 
3956     /**
3957      * @return the buffer strategy used by this component
3958      * @see Window#createBufferStrategy
3959      * @see Canvas#createBufferStrategy
3960      * @since 1.4
3961      */
3962     BufferStrategy getBufferStrategy() {
3963         return bufferStrategy;
3964     }
3965 
3966     /**
3967      * @return the back buffer currently used by this component's
3968      * BufferStrategy.  If there is no BufferStrategy or no
3969      * back buffer, this method returns null.
3970      */
3971     Image getBackBuffer() {
3972         if (bufferStrategy != null) {
3973             if (bufferStrategy instanceof BltBufferStrategy) {
3974                 BltBufferStrategy bltBS = (BltBufferStrategy)bufferStrategy;
3975                 return bltBS.getBackBuffer();
3976             } else if (bufferStrategy instanceof FlipBufferStrategy) {
3977                 FlipBufferStrategy flipBS = (FlipBufferStrategy)bufferStrategy;
3978                 return flipBS.getBackBuffer();
3979             }
3980         }
3981         return null;
3982     }
3983 
3984     /**
3985      * Inner class for flipping buffers on a component.  That component must
3986      * be a <code>Canvas</code> or <code>Window</code> or <code>Applet</code>.
3987      * @see Canvas
3988      * @see Window
3989      * @see Applet
3990      * @see java.awt.image.BufferStrategy
3991      * @author Michael Martak
3992      * @since 1.4
3993      */
3994     protected class FlipBufferStrategy extends BufferStrategy {
3995         /**
3996          * The number of buffers
3997          */
3998         protected int numBuffers; // = 0
3999         /**
4000          * The buffering capabilities
4001          */
4002         protected BufferCapabilities caps; // = null
4003         /**
4004          * The drawing buffer
4005          */
4006         protected Image drawBuffer; // = null
4007         /**
4008          * The drawing buffer as a volatile image
4009          */
4010         protected VolatileImage drawVBuffer; // = null
4011         /**
4012          * Whether or not the drawing buffer has been recently restored from
4013          * a lost state.
4014          */
4015         protected boolean validatedContents; // = false
4016 
4017         /**
4018          * Size of the back buffers.  (Note: these fields were added in 6.0
4019          * but kept package-private to avoid exposing them in the spec.
4020          * None of these fields/methods really should have been marked
4021          * protected when they were introduced in 1.4, but now we just have
4022          * to live with that decision.)
4023          */
4024 
4025          /**
4026           * The width of the back buffers
4027           */
4028         int width;
4029 
4030         /**
4031          * The height of the back buffers
4032          */
4033         int height;
4034 
4035         /**
4036          * Creates a new flipping buffer strategy for this component.
4037          * The component must be a <code>Canvas</code> or <code>Window</code> or
4038          * <code>Applet</code>.
4039          * @see Canvas
4040          * @see Window
4041          * @see Applet
4042          * @param numBuffers the number of buffers
4043          * @param caps the capabilities of the buffers
4044          * @exception AWTException if the capabilities supplied could not be
4045          * supported or met
4046          * @exception ClassCastException if the component is not a canvas or
4047          * window.
4048          * @exception IllegalStateException if the component has no peer
4049          * @exception IllegalArgumentException if {@code numBuffers} is less than two,
4050          * or if {@code BufferCapabilities.isPageFlipping} is not
4051          * {@code true}.
4052          * @see #createBuffers(int, BufferCapabilities)
4053          */
4054         protected FlipBufferStrategy(int numBuffers, BufferCapabilities caps)
4055             throws AWTException
4056         {
4057             if (!(Component.this instanceof Window) &&
4058                 !(Component.this instanceof Canvas) &&
4059                 !(Component.this instanceof Applet))
4060             {
4061                 throw new ClassCastException(
4062                         "Component must be a Canvas or Window or Applet");
4063             }
4064             this.numBuffers = numBuffers;
4065             this.caps = caps;
4066             createBuffers(numBuffers, caps);
4067         }
4068 
4069         /**
4070          * Creates one or more complex, flipping buffers with the given
4071          * capabilities.
4072          * @param numBuffers number of buffers to create; must be greater than
4073          * one
4074          * @param caps the capabilities of the buffers.
4075          * <code>BufferCapabilities.isPageFlipping</code> must be
4076          * <code>true</code>.
4077          * @exception AWTException if the capabilities supplied could not be
4078          * supported or met
4079          * @exception IllegalStateException if the component has no peer
4080          * @exception IllegalArgumentException if numBuffers is less than two,
4081          * or if <code>BufferCapabilities.isPageFlipping</code> is not
4082          * <code>true</code>.
4083          * @see java.awt.BufferCapabilities#isPageFlipping()
4084          */
4085         protected void createBuffers(int numBuffers, BufferCapabilities caps)
4086             throws AWTException
4087         {
4088             if (numBuffers < 2) {
4089                 throw new IllegalArgumentException(
4090                     "Number of buffers cannot be less than two");
4091             } else if (peer == null) {
4092                 throw new IllegalStateException(
4093                     "Component must have a valid peer");
4094             } else if (caps == null || !caps.isPageFlipping()) {
4095                 throw new IllegalArgumentException(
4096                     "Page flipping capabilities must be specified");
4097             }
4098 
4099             // save the current bounds
4100             width = getWidth();
4101             height = getHeight();
4102 
4103             if (drawBuffer != null) {
4104                 // dispose the existing backbuffers
4105                 drawBuffer = null;
4106                 drawVBuffer = null;
4107                 destroyBuffers();
4108                 // ... then recreate the backbuffers
4109             }
4110 
4111             if (caps instanceof ExtendedBufferCapabilities) {
4112                 ExtendedBufferCapabilities ebc =
4113                     (ExtendedBufferCapabilities)caps;
4114                 if (ebc.getVSync() == VSYNC_ON) {
4115                     // if this buffer strategy is not allowed to be v-synced,
4116                     // change the caps that we pass to the peer but keep on
4117                     // trying to create v-synced buffers;
4118                     // do not throw IAE here in case it is disallowed, see
4119                     // ExtendedBufferCapabilities for more info
4120                     if (!VSyncedBSManager.vsyncAllowed(this)) {
4121                         caps = ebc.derive(VSYNC_DEFAULT);
4122                     }
4123                 }
4124             }
4125 
4126             peer.createBuffers(numBuffers, caps);
4127             updateInternalBuffers();
4128         }
4129 
4130         /**
4131          * Updates internal buffers (both volatile and non-volatile)
4132          * by requesting the back-buffer from the peer.
4133          */
4134         private void updateInternalBuffers() {
4135             // get the images associated with the draw buffer
4136             drawBuffer = getBackBuffer();
4137             if (drawBuffer instanceof VolatileImage) {
4138                 drawVBuffer = (VolatileImage)drawBuffer;
4139             } else {
4140                 drawVBuffer = null;
4141             }
4142         }
4143 
4144         /**
4145          * @return direct access to the back buffer, as an image.
4146          * @exception IllegalStateException if the buffers have not yet
4147          * been created
4148          */
4149         protected Image getBackBuffer() {
4150             if (peer != null) {
4151                 return peer.getBackBuffer();
4152             } else {
4153                 throw new IllegalStateException(
4154                     "Component must have a valid peer");
4155             }
4156         }
4157 
4158         /**
4159          * Flipping moves the contents of the back buffer to the front buffer,
4160          * either by copying or by moving the video pointer.
4161          * @param flipAction an integer value describing the flipping action
4162          * for the contents of the back buffer.  This should be one of the
4163          * values of the <code>BufferCapabilities.FlipContents</code>
4164          * property.
4165          * @exception IllegalStateException if the buffers have not yet
4166          * been created
4167          * @see java.awt.BufferCapabilities#getFlipContents()
4168          */
4169         protected void flip(BufferCapabilities.FlipContents flipAction) {
4170             if (peer != null) {
4171                 Image backBuffer = getBackBuffer();
4172                 if (backBuffer != null) {
4173                     peer.flip(0, 0,
4174                               backBuffer.getWidth(null),
4175                               backBuffer.getHeight(null), flipAction);
4176                 }
4177             } else {
4178                 throw new IllegalStateException(
4179                     "Component must have a valid peer");
4180             }
4181         }
4182 
4183         void flipSubRegion(int x1, int y1, int x2, int y2,
4184                       BufferCapabilities.FlipContents flipAction)
4185         {
4186             if (peer != null) {
4187                 peer.flip(x1, y1, x2, y2, flipAction);
4188             } else {
4189                 throw new IllegalStateException(
4190                     "Component must have a valid peer");
4191             }
4192         }
4193 
4194         /**
4195          * Destroys the buffers created through this object
4196          */
4197         protected void destroyBuffers() {
4198             VSyncedBSManager.releaseVsync(this);
4199             if (peer != null) {
4200                 peer.destroyBuffers();
4201             } else {
4202                 throw new IllegalStateException(
4203                     "Component must have a valid peer");
4204             }
4205         }
4206 
4207         /**
4208          * @return the buffering capabilities of this strategy
4209          */
4210         public BufferCapabilities getCapabilities() {
4211             if (caps instanceof ProxyCapabilities) {
4212                 return ((ProxyCapabilities)caps).orig;
4213             } else {
4214                 return caps;
4215             }
4216         }
4217 
4218         /**
4219          * @return the graphics on the drawing buffer.  This method may not
4220          * be synchronized for performance reasons; use of this method by multiple
4221          * threads should be handled at the application level.  Disposal of the
4222          * graphics object must be handled by the application.
4223          */
4224         public Graphics getDrawGraphics() {
4225             revalidate();
4226             return drawBuffer.getGraphics();
4227         }
4228 
4229         /**
4230          * Restore the drawing buffer if it has been lost
4231          */
4232         protected void revalidate() {
4233             revalidate(true);
4234         }
4235 
4236         void revalidate(boolean checkSize) {
4237             validatedContents = false;
4238 
4239             if (checkSize && (getWidth() != width || getHeight() != height)) {
4240                 // component has been resized; recreate the backbuffers
4241                 try {
4242                     createBuffers(numBuffers, caps);
4243                 } catch (AWTException e) {
4244                     // shouldn't be possible
4245                 }
4246                 validatedContents = true;
4247             }
4248 
4249             // get the buffers from the peer every time since they
4250             // might have been replaced in response to a display change event
4251             updateInternalBuffers();
4252 
4253             // now validate the backbuffer
4254             if (drawVBuffer != null) {
4255                 GraphicsConfiguration gc =
4256                         getGraphicsConfiguration_NoClientCode();
4257                 int returnCode = drawVBuffer.validate(gc);
4258                 if (returnCode == VolatileImage.IMAGE_INCOMPATIBLE) {
4259                     try {
4260                         createBuffers(numBuffers, caps);
4261                     } catch (AWTException e) {
4262                         // shouldn't be possible
4263                     }
4264                     if (drawVBuffer != null) {
4265                         // backbuffers were recreated, so validate again
4266                         drawVBuffer.validate(gc);
4267                     }
4268                     validatedContents = true;
4269                 } else if (returnCode == VolatileImage.IMAGE_RESTORED) {
4270                     validatedContents = true;
4271                 }
4272             }
4273         }
4274 
4275         /**
4276          * @return whether the drawing buffer was lost since the last call to
4277          * <code>getDrawGraphics</code>
4278          */
4279         public boolean contentsLost() {
4280             if (drawVBuffer == null) {
4281                 return false;
4282             }
4283             return drawVBuffer.contentsLost();
4284         }
4285 
4286         /**
4287          * @return whether the drawing buffer was recently restored from a lost
4288          * state and reinitialized to the default background color (white)
4289          */
4290         public boolean contentsRestored() {
4291             return validatedContents;
4292         }
4293 
4294         /**
4295          * Makes the next available buffer visible by either blitting or
4296          * flipping.
4297          */
4298         public void show() {
4299             flip(caps.getFlipContents());
4300         }
4301 
4302         /**
4303          * Makes specified region of the next available buffer visible
4304          * by either blitting or flipping.
4305          */
4306         void showSubRegion(int x1, int y1, int x2, int y2) {
4307             flipSubRegion(x1, y1, x2, y2, caps.getFlipContents());
4308         }
4309 
4310         /**
4311          * {@inheritDoc}
4312          * @since 1.6
4313          */
4314         public void dispose() {
4315             if (Component.this.bufferStrategy == this) {
4316                 Component.this.bufferStrategy = null;
4317                 if (peer != null) {
4318                     destroyBuffers();
4319                 }
4320             }
4321         }
4322 
4323     } // Inner class FlipBufferStrategy
4324 
4325     /**
4326      * Inner class for blitting offscreen surfaces to a component.
4327      *
4328      * @author Michael Martak
4329      * @since 1.4
4330      */
4331     protected class BltBufferStrategy extends BufferStrategy {
4332 
4333         /**
4334          * The buffering capabilities
4335          */
4336         protected BufferCapabilities caps; // = null
4337         /**
4338          * The back buffers
4339          */
4340         protected VolatileImage[] backBuffers; // = null
4341         /**
4342          * Whether or not the drawing buffer has been recently restored from
4343          * a lost state.
4344          */
4345         protected boolean validatedContents; // = false
4346         /**
4347          * Width of the back buffers
4348          */
4349         protected int width;
4350         /**
4351          * Height of the back buffers
4352          */
4353         protected int height;
4354 
4355         /**
4356          * Insets for the hosting Component.  The size of the back buffer
4357          * is constrained by these.
4358          */
4359         private Insets insets;
4360 
4361         /**
4362          * Creates a new blt buffer strategy around a component
4363          * @param numBuffers number of buffers to create, including the
4364          * front buffer
4365          * @param caps the capabilities of the buffers
4366          */
4367         protected BltBufferStrategy(int numBuffers, BufferCapabilities caps) {
4368             this.caps = caps;
4369             createBackBuffers(numBuffers - 1);
4370         }
4371 
4372         /**
4373          * {@inheritDoc}
4374          * @since 1.6
4375          */
4376         public void dispose() {
4377             if (backBuffers != null) {
4378                 for (int counter = backBuffers.length - 1; counter >= 0;
4379                      counter--) {
4380                     if (backBuffers[counter] != null) {
4381                         backBuffers[counter].flush();
4382                         backBuffers[counter] = null;
4383                     }
4384                 }
4385             }
4386             if (Component.this.bufferStrategy == this) {
4387                 Component.this.bufferStrategy = null;
4388             }
4389         }
4390 
4391         /**
4392          * Creates the back buffers
4393          *
4394          * @param numBuffers the number of buffers to create
4395          */
4396         protected void createBackBuffers(int numBuffers) {
4397             if (numBuffers == 0) {
4398                 backBuffers = null;
4399             } else {
4400                 // save the current bounds
4401                 width = getWidth();
4402                 height = getHeight();
4403                 insets = getInsets_NoClientCode();
4404                 int iWidth = width - insets.left - insets.right;
4405                 int iHeight = height - insets.top - insets.bottom;
4406 
4407                 // It is possible for the component's width and/or height
4408                 // to be 0 here.  Force the size of the backbuffers to
4409                 // be > 0 so that creating the image won't fail.
4410                 iWidth = Math.max(1, iWidth);
4411                 iHeight = Math.max(1, iHeight);
4412                 if (backBuffers == null) {
4413                     backBuffers = new VolatileImage[numBuffers];
4414                 } else {
4415                     // flush any existing backbuffers
4416                     for (int i = 0; i < numBuffers; i++) {
4417                         if (backBuffers[i] != null) {
4418                             backBuffers[i].flush();
4419                             backBuffers[i] = null;
4420                         }
4421                     }
4422                 }
4423 
4424                 // create the backbuffers
4425                 for (int i = 0; i < numBuffers; i++) {
4426                     backBuffers[i] = createVolatileImage(iWidth, iHeight);
4427                 }
4428             }
4429         }
4430 
4431         /**
4432          * @return the buffering capabilities of this strategy
4433          */
4434         public BufferCapabilities getCapabilities() {
4435             return caps;
4436         }
4437 
4438         /**
4439          * @return the draw graphics
4440          */
4441         public Graphics getDrawGraphics() {
4442             revalidate();
4443             Image backBuffer = getBackBuffer();
4444             if (backBuffer == null) {
4445                 return getGraphics();
4446             }
4447             SunGraphics2D g = (SunGraphics2D)backBuffer.getGraphics();
4448             g.constrain(-insets.left, -insets.top,
4449                         backBuffer.getWidth(null) + insets.left,
4450                         backBuffer.getHeight(null) + insets.top);
4451             return g;
4452         }
4453 
4454         /**
4455          * @return direct access to the back buffer, as an image.
4456          * If there is no back buffer, returns null.
4457          */
4458         Image getBackBuffer() {
4459             if (backBuffers != null) {
4460                 return backBuffers[backBuffers.length - 1];
4461             } else {
4462                 return null;
4463             }
4464         }
4465 
4466         /**
4467          * Makes the next available buffer visible.
4468          */
4469         public void show() {
4470             showSubRegion(insets.left, insets.top,
4471                           width - insets.right,
4472                           height - insets.bottom);
4473         }
4474 
4475         /**
4476          * Package-private method to present a specific rectangular area
4477          * of this buffer.  This class currently shows only the entire
4478          * buffer, by calling showSubRegion() with the full dimensions of
4479          * the buffer.  Subclasses (e.g., BltSubRegionBufferStrategy
4480          * and FlipSubRegionBufferStrategy) may have region-specific show
4481          * methods that call this method with actual sub regions of the
4482          * buffer.
4483          */
4484         void showSubRegion(int x1, int y1, int x2, int y2) {
4485             if (backBuffers == null) {
4486                 return;
4487             }
4488             // Adjust location to be relative to client area.
4489             x1 -= insets.left;
4490             x2 -= insets.left;
4491             y1 -= insets.top;
4492             y2 -= insets.top;
4493             Graphics g = getGraphics_NoClientCode();
4494             if (g == null) {
4495                 // Not showing, bail
4496                 return;
4497             }
4498             try {
4499                 // First image copy is in terms of Frame's coordinates, need
4500                 // to translate to client area.
4501                 g.translate(insets.left, insets.top);
4502                 for (int i = 0; i < backBuffers.length; i++) {
4503                     g.drawImage(backBuffers[i],
4504                                 x1, y1, x2, y2,
4505                                 x1, y1, x2, y2,
4506                                 null);
4507                     g.dispose();
4508                     g = null;
4509                     g = backBuffers[i].getGraphics();
4510                 }
4511             } finally {
4512                 if (g != null) {
4513                     g.dispose();
4514                 }
4515             }
4516         }
4517 
4518         /**
4519          * Restore the drawing buffer if it has been lost
4520          */
4521         protected void revalidate() {
4522             revalidate(true);
4523         }
4524 
4525         void revalidate(boolean checkSize) {
4526             validatedContents = false;
4527 
4528             if (backBuffers == null) {
4529                 return;
4530             }
4531 
4532             if (checkSize) {
4533                 Insets insets = getInsets_NoClientCode();
4534                 if (getWidth() != width || getHeight() != height ||
4535                     !insets.equals(this.insets)) {
4536                     // component has been resized; recreate the backbuffers
4537                     createBackBuffers(backBuffers.length);
4538                     validatedContents = true;
4539                 }
4540             }
4541 
4542             // now validate the backbuffer
4543             GraphicsConfiguration gc = getGraphicsConfiguration_NoClientCode();
4544             int returnCode =
4545                 backBuffers[backBuffers.length - 1].validate(gc);
4546             if (returnCode == VolatileImage.IMAGE_INCOMPATIBLE) {
4547                 if (checkSize) {
4548                     createBackBuffers(backBuffers.length);
4549                     // backbuffers were recreated, so validate again
4550                     backBuffers[backBuffers.length - 1].validate(gc);
4551                 }
4552                 // else case means we're called from Swing on the toolkit
4553                 // thread, don't recreate buffers as that'll deadlock
4554                 // (creating VolatileImages invokes getting GraphicsConfig
4555                 // which grabs treelock).
4556                 validatedContents = true;
4557             } else if (returnCode == VolatileImage.IMAGE_RESTORED) {
4558                 validatedContents = true;
4559             }
4560         }
4561 
4562         /**
4563          * @return whether the drawing buffer was lost since the last call to
4564          * <code>getDrawGraphics</code>
4565          */
4566         public boolean contentsLost() {
4567             if (backBuffers == null) {
4568                 return false;
4569             } else {
4570                 return backBuffers[backBuffers.length - 1].contentsLost();
4571             }
4572         }
4573 
4574         /**
4575          * @return whether the drawing buffer was recently restored from a lost
4576          * state and reinitialized to the default background color (white)
4577          */
4578         public boolean contentsRestored() {
4579             return validatedContents;
4580         }
4581     } // Inner class BltBufferStrategy
4582 
4583     /**
4584      * Private class to perform sub-region flipping.
4585      */
4586     private class FlipSubRegionBufferStrategy extends FlipBufferStrategy
4587         implements SubRegionShowable
4588     {
4589 
4590         protected FlipSubRegionBufferStrategy(int numBuffers,
4591                                               BufferCapabilities caps)
4592             throws AWTException
4593         {
4594             super(numBuffers, caps);
4595         }
4596 
4597         public void show(int x1, int y1, int x2, int y2) {
4598             showSubRegion(x1, y1, x2, y2);
4599         }
4600 
4601         // This is invoked by Swing on the toolkit thread.
4602         public boolean showIfNotLost(int x1, int y1, int x2, int y2) {
4603             if (!contentsLost()) {
4604                 showSubRegion(x1, y1, x2, y2);
4605                 return !contentsLost();
4606             }
4607             return false;
4608         }
4609     }
4610 
4611     /**
4612      * Private class to perform sub-region blitting.  Swing will use
4613      * this subclass via the SubRegionShowable interface in order to
4614      * copy only the area changed during a repaint.
4615      * See javax.swing.BufferStrategyPaintManager.
4616      */
4617     private class BltSubRegionBufferStrategy extends BltBufferStrategy
4618         implements SubRegionShowable
4619     {
4620 
4621         protected BltSubRegionBufferStrategy(int numBuffers,
4622                                              BufferCapabilities caps)
4623         {
4624             super(numBuffers, caps);
4625         }
4626 
4627         public void show(int x1, int y1, int x2, int y2) {
4628             showSubRegion(x1, y1, x2, y2);
4629         }
4630 
4631         // This method is called by Swing on the toolkit thread.
4632         public boolean showIfNotLost(int x1, int y1, int x2, int y2) {
4633             if (!contentsLost()) {
4634                 showSubRegion(x1, y1, x2, y2);
4635                 return !contentsLost();
4636             }
4637             return false;
4638         }
4639     }
4640 
4641     /**
4642      * Inner class for flipping buffers on a component.  That component must
4643      * be a <code>Canvas</code> or <code>Window</code>.
4644      * @see Canvas
4645      * @see Window
4646      * @see java.awt.image.BufferStrategy
4647      * @author Michael Martak
4648      * @since 1.4
4649      */
4650     private class SingleBufferStrategy extends BufferStrategy {
4651 
4652         private BufferCapabilities caps;
4653 
4654         public SingleBufferStrategy(BufferCapabilities caps) {
4655             this.caps = caps;
4656         }
4657         public BufferCapabilities getCapabilities() {
4658             return caps;
4659         }
4660         public Graphics getDrawGraphics() {
4661             return getGraphics();
4662         }
4663         public boolean contentsLost() {
4664             return false;
4665         }
4666         public boolean contentsRestored() {
4667             return false;
4668         }
4669         public void show() {
4670             // Do nothing
4671         }
4672     } // Inner class SingleBufferStrategy
4673 
4674     /**
4675      * Sets whether or not paint messages received from the operating system
4676      * should be ignored.  This does not affect paint events generated in
4677      * software by the AWT, unless they are an immediate response to an
4678      * OS-level paint message.
4679      * <p>
4680      * This is useful, for example, if running under full-screen mode and
4681      * better performance is desired, or if page-flipping is used as the
4682      * buffer strategy.
4683      *
4684      * @param ignoreRepaint {@code true} if the paint messages from the OS
4685      *                      should be ignored; otherwise {@code false}
4686      *
4687      * @since 1.4
4688      * @see #getIgnoreRepaint
4689      * @see Canvas#createBufferStrategy
4690      * @see Window#createBufferStrategy
4691      * @see java.awt.image.BufferStrategy
4692      * @see GraphicsDevice#setFullScreenWindow
4693      */
4694     public void setIgnoreRepaint(boolean ignoreRepaint) {
4695         this.ignoreRepaint = ignoreRepaint;
4696     }
4697 
4698     /**
4699      * @return whether or not paint messages received from the operating system
4700      * should be ignored.
4701      *
4702      * @since 1.4
4703      * @see #setIgnoreRepaint
4704      */
4705     public boolean getIgnoreRepaint() {
4706         return ignoreRepaint;
4707     }
4708 
4709     /**
4710      * Checks whether this component "contains" the specified point,
4711      * where <code>x</code> and <code>y</code> are defined to be
4712      * relative to the coordinate system of this component.
4713      *
4714      * @param     x   the <i>x</i> coordinate of the point
4715      * @param     y   the <i>y</i> coordinate of the point
4716      * @return {@code true} if the point is within the component;
4717      *         otherwise {@code false}
4718      * @see       #getComponentAt(int, int)
4719      * @since     1.1
4720      */
4721     public boolean contains(int x, int y) {
4722         return inside(x, y);
4723     }
4724 
4725     /**
4726      * Checks whether the point is inside of this component.
4727      *
4728      * @param  x the <i>x</i> coordinate of the point
4729      * @param  y the <i>y</i> coordinate of the point
4730      * @return {@code true} if the point is within the component;
4731      *         otherwise {@code false}
4732      * @deprecated As of JDK version 1.1,
4733      * replaced by contains(int, int).
4734      */
4735     @Deprecated
4736     public boolean inside(int x, int y) {
4737         return (x >= 0) && (x < width) && (y >= 0) && (y < height);
4738     }
4739 
4740     /**
4741      * Checks whether this component "contains" the specified point,
4742      * where the point's <i>x</i> and <i>y</i> coordinates are defined
4743      * to be relative to the coordinate system of this component.
4744      *
4745      * @param     p     the point
4746      * @return {@code true} if the point is within the component;
4747      *         otherwise {@code false}
4748      * @throws    NullPointerException if {@code p} is {@code null}
4749      * @see       #getComponentAt(Point)
4750      * @since     1.1
4751      */
4752     public boolean contains(Point p) {
4753         return contains(p.x, p.y);
4754     }
4755 
4756     /**
4757      * Determines if this component or one of its immediate
4758      * subcomponents contains the (<i>x</i>,&nbsp;<i>y</i>) location,
4759      * and if so, returns the containing component. This method only
4760      * looks one level deep. If the point (<i>x</i>,&nbsp;<i>y</i>) is
4761      * inside a subcomponent that itself has subcomponents, it does not
4762      * go looking down the subcomponent tree.
4763      * <p>
4764      * The <code>locate</code> method of <code>Component</code> simply
4765      * returns the component itself if the (<i>x</i>,&nbsp;<i>y</i>)
4766      * coordinate location is inside its bounding box, and <code>null</code>
4767      * otherwise.
4768      * @param     x   the <i>x</i> coordinate
4769      * @param     y   the <i>y</i> coordinate
4770      * @return    the component or subcomponent that contains the
4771      *                (<i>x</i>,&nbsp;<i>y</i>) location;
4772      *                <code>null</code> if the location
4773      *                is outside this component
4774      * @see       #contains(int, int)
4775      * @since     1.0
4776      */
4777     public Component getComponentAt(int x, int y) {
4778         return locate(x, y);
4779     }
4780 
4781     /**
4782      * Returns the component occupying the position specified (this component,
4783      * or immediate child component, or null if neither
4784      * of the first two occupies the location).
4785      *
4786      * @param  x the <i>x</i> coordinate to search for components at
4787      * @param  y the <i>y</i> coordinate to search for components at
4788      * @return the component at the specified location or {@code null}
4789      * @deprecated As of JDK version 1.1,
4790      * replaced by getComponentAt(int, int).
4791      */
4792     @Deprecated
4793     public Component locate(int x, int y) {
4794         return contains(x, y) ? this : null;
4795     }
4796 
4797     /**
4798      * Returns the component or subcomponent that contains the
4799      * specified point.
4800      * @param  p the point
4801      * @return the component at the specified location or {@code null}
4802      * @see java.awt.Component#contains
4803      * @since 1.1
4804      */
4805     public Component getComponentAt(Point p) {
4806         return getComponentAt(p.x, p.y);
4807     }
4808 
4809     /**
4810      * @param  e the event to deliver
4811      * @deprecated As of JDK version 1.1,
4812      * replaced by <code>dispatchEvent(AWTEvent e)</code>.
4813      */
4814     @Deprecated
4815     public void deliverEvent(Event e) {
4816         postEvent(e);
4817     }
4818 
4819     /**
4820      * Dispatches an event to this component or one of its sub components.
4821      * Calls <code>processEvent</code> before returning for 1.1-style
4822      * events which have been enabled for the <code>Component</code>.
4823      * @param e the event
4824      */
4825     public final void dispatchEvent(AWTEvent e) {
4826         dispatchEventImpl(e);
4827     }
4828 
4829     @SuppressWarnings("deprecation")
4830     void dispatchEventImpl(AWTEvent e) {
4831         int id = e.getID();
4832 
4833         // Check that this component belongs to this app-context
4834         AppContext compContext = appContext;
4835         if (compContext != null && !compContext.equals(AppContext.getAppContext())) {
4836             if (eventLog.isLoggable(PlatformLogger.Level.FINE)) {
4837                 eventLog.fine("Event " + e + " is being dispatched on the wrong AppContext");
4838             }
4839         }
4840 
4841         if (eventLog.isLoggable(PlatformLogger.Level.FINEST)) {
4842             eventLog.finest("{0}", e);
4843         }
4844 
4845         /*
4846          * 0. Set timestamp and modifiers of current event.
4847          */
4848         if (!(e instanceof KeyEvent)) {
4849             // Timestamp of a key event is set later in DKFM.preDispatchKeyEvent(KeyEvent).
4850             EventQueue.setCurrentEventAndMostRecentTime(e);
4851         }
4852 
4853         /*
4854          * 1. Pre-dispatchers. Do any necessary retargeting/reordering here
4855          *    before we notify AWTEventListeners.
4856          */
4857 
4858         if (e instanceof SunDropTargetEvent) {
4859             ((SunDropTargetEvent)e).dispatch();
4860             return;
4861         }
4862 
4863         if (!e.focusManagerIsDispatching) {
4864             // Invoke the private focus retargeting method which provides
4865             // lightweight Component support
4866             if (e.isPosted) {
4867                 e = KeyboardFocusManager.retargetFocusEvent(e);
4868                 e.isPosted = true;
4869             }
4870 
4871             // Now, with the event properly targeted to a lightweight
4872             // descendant if necessary, invoke the public focus retargeting
4873             // and dispatching function
4874             if (KeyboardFocusManager.getCurrentKeyboardFocusManager().
4875                 dispatchEvent(e))
4876             {
4877                 return;
4878             }
4879         }
4880         if ((e instanceof FocusEvent) && focusLog.isLoggable(PlatformLogger.Level.FINEST)) {
4881             focusLog.finest("" + e);
4882         }
4883         // MouseWheel may need to be retargeted here so that
4884         // AWTEventListener sees the event go to the correct
4885         // Component.  If the MouseWheelEvent needs to go to an ancestor,
4886         // the event is dispatched to the ancestor, and dispatching here
4887         // stops.
4888         if (id == MouseEvent.MOUSE_WHEEL &&
4889             (!eventTypeEnabled(id)) &&
4890             (peer != null && !peer.handlesWheelScrolling()) &&
4891             (dispatchMouseWheelToAncestor((MouseWheelEvent)e)))
4892         {
4893             return;
4894         }
4895 
4896         /*
4897          * 2. Allow the Toolkit to pass this to AWTEventListeners.
4898          */
4899         Toolkit toolkit = Toolkit.getDefaultToolkit();
4900         toolkit.notifyAWTEventListeners(e);
4901 
4902 
4903         /*
4904          * 3. If no one has consumed a key event, allow the
4905          *    KeyboardFocusManager to process it.
4906          */
4907         if (!e.isConsumed()) {
4908             if (e instanceof java.awt.event.KeyEvent) {
4909                 KeyboardFocusManager.getCurrentKeyboardFocusManager().
4910                     processKeyEvent(this, (KeyEvent)e);
4911                 if (e.isConsumed()) {
4912                     return;
4913                 }
4914             }
4915         }
4916 
4917         /*
4918          * 4. Allow input methods to process the event
4919          */
4920         if (areInputMethodsEnabled()) {
4921             // We need to pass on InputMethodEvents since some host
4922             // input method adapters send them through the Java
4923             // event queue instead of directly to the component,
4924             // and the input context also handles the Java composition window
4925             if(((e instanceof InputMethodEvent) && !(this instanceof CompositionArea))
4926                ||
4927                // Otherwise, we only pass on input and focus events, because
4928                // a) input methods shouldn't know about semantic or component-level events
4929                // b) passing on the events takes time
4930                // c) isConsumed() is always true for semantic events.
4931                (e instanceof InputEvent) || (e instanceof FocusEvent)) {
4932                 InputContext inputContext = getInputContext();
4933 
4934 
4935                 if (inputContext != null) {
4936                     inputContext.dispatchEvent(e);
4937                     if (e.isConsumed()) {
4938                         if ((e instanceof FocusEvent) && focusLog.isLoggable(PlatformLogger.Level.FINEST)) {
4939                             focusLog.finest("3579: Skipping " + e);
4940                         }
4941                         return;
4942                     }
4943                 }
4944             }
4945         } else {
4946             // When non-clients get focus, we need to explicitly disable the native
4947             // input method. The native input method is actually not disabled when
4948             // the active/passive/peered clients loose focus.
4949             if (id == FocusEvent.FOCUS_GAINED) {
4950                 InputContext inputContext = getInputContext();
4951                 if (inputContext != null && inputContext instanceof sun.awt.im.InputContext) {
4952                     ((sun.awt.im.InputContext)inputContext).disableNativeIM();
4953                 }
4954             }
4955         }
4956 
4957 
4958         /*
4959          * 5. Pre-process any special events before delivery
4960          */
4961         switch(id) {
4962             // Handling of the PAINT and UPDATE events is now done in the
4963             // peer's handleEvent() method so the background can be cleared
4964             // selectively for non-native components on Windows only.
4965             // - Fred.Ecks@Eng.sun.com, 5-8-98
4966 
4967           case KeyEvent.KEY_PRESSED:
4968           case KeyEvent.KEY_RELEASED:
4969               Container p = (Container)((this instanceof Container) ? this : parent);
4970               if (p != null) {
4971                   p.preProcessKeyEvent((KeyEvent)e);
4972                   if (e.isConsumed()) {
4973                         if (focusLog.isLoggable(PlatformLogger.Level.FINEST)) {
4974                             focusLog.finest("Pre-process consumed event");
4975                         }
4976                       return;
4977                   }
4978               }
4979               break;
4980 
4981           default:
4982               break;
4983         }
4984 
4985         /*
4986          * 6. Deliver event for normal processing
4987          */
4988         if (newEventsOnly) {
4989             // Filtering needs to really be moved to happen at a lower
4990             // level in order to get maximum performance gain;  it is
4991             // here temporarily to ensure the API spec is honored.
4992             //
4993             if (eventEnabled(e)) {
4994                 processEvent(e);
4995             }
4996         } else if (id == MouseEvent.MOUSE_WHEEL) {
4997             // newEventsOnly will be false for a listenerless ScrollPane, but
4998             // MouseWheelEvents still need to be dispatched to it so scrolling
4999             // can be done.
5000             autoProcessMouseWheel((MouseWheelEvent)e);
5001         } else if (!(e instanceof MouseEvent && !postsOldMouseEvents())) {
5002             //
5003             // backward compatibility
5004             //
5005             Event olde = e.convertToOld();
5006             if (olde != null) {
5007                 int key = olde.key;
5008                 int modifiers = olde.modifiers;
5009 
5010                 postEvent(olde);
5011                 if (olde.isConsumed()) {
5012                     e.consume();
5013                 }
5014                 // if target changed key or modifier values, copy them
5015                 // back to original event
5016                 //
5017                 switch(olde.id) {
5018                   case Event.KEY_PRESS:
5019                   case Event.KEY_RELEASE:
5020                   case Event.KEY_ACTION:
5021                   case Event.KEY_ACTION_RELEASE:
5022                       if (olde.key != key) {
5023                           ((KeyEvent)e).setKeyChar(olde.getKeyEventChar());
5024                       }
5025                       if (olde.modifiers != modifiers) {
5026                           ((KeyEvent)e).setModifiers(olde.modifiers);
5027                       }
5028                       break;
5029                   default:
5030                       break;
5031                 }
5032             }
5033         }
5034 
5035         /*
5036          * 9. Allow the peer to process the event.
5037          * Except KeyEvents, they will be processed by peer after
5038          * all KeyEventPostProcessors
5039          * (see DefaultKeyboardFocusManager.dispatchKeyEvent())
5040          */
5041         if (!(e instanceof KeyEvent)) {
5042             ComponentPeer tpeer = peer;
5043             if (e instanceof FocusEvent && (tpeer == null || tpeer instanceof LightweightPeer)) {
5044                 // if focus owner is lightweight then its native container
5045                 // processes event
5046                 Component source = (Component)e.getSource();
5047                 if (source != null) {
5048                     Container target = source.getNativeContainer();
5049                     if (target != null) {
5050                         tpeer = target.peer;
5051                     }
5052                 }
5053             }
5054             if (tpeer != null) {
5055                 tpeer.handleEvent(e);
5056             }
5057         }
5058     } // dispatchEventImpl()
5059 
5060     /*
5061      * If newEventsOnly is false, method is called so that ScrollPane can
5062      * override it and handle common-case mouse wheel scrolling.  NOP
5063      * for Component.
5064      */
5065     void autoProcessMouseWheel(MouseWheelEvent e) {}
5066 
5067     /*
5068      * Dispatch given MouseWheelEvent to the first ancestor for which
5069      * MouseWheelEvents are enabled.
5070      *
5071      * Returns whether or not event was dispatched to an ancestor
5072      */
5073     boolean dispatchMouseWheelToAncestor(MouseWheelEvent e) {
5074         int newX, newY;
5075         newX = e.getX() + getX(); // Coordinates take into account at least
5076         newY = e.getY() + getY(); // the cursor's position relative to this
5077                                   // Component (e.getX()), and this Component's
5078                                   // position relative to its parent.
5079         MouseWheelEvent newMWE;
5080 
5081         if (eventLog.isLoggable(PlatformLogger.Level.FINEST)) {
5082             eventLog.finest("dispatchMouseWheelToAncestor");
5083             eventLog.finest("orig event src is of " + e.getSource().getClass());
5084         }
5085 
5086         /* parent field for Window refers to the owning Window.
5087          * MouseWheelEvents should NOT be propagated into owning Windows
5088          */
5089         synchronized (getTreeLock()) {
5090             Container anc = getParent();
5091             while (anc != null && !anc.eventEnabled(e)) {
5092                 // fix coordinates to be relative to new event source
5093                 newX += anc.getX();
5094                 newY += anc.getY();
5095 
5096                 if (!(anc instanceof Window)) {
5097                     anc = anc.getParent();
5098                 }
5099                 else {
5100                     break;
5101                 }
5102             }
5103 
5104             if (eventLog.isLoggable(PlatformLogger.Level.FINEST)) {
5105                 eventLog.finest("new event src is " + anc.getClass());
5106             }
5107 
5108             if (anc != null && anc.eventEnabled(e)) {
5109                 // Change event to be from new source, with new x,y
5110                 // For now, just create a new event - yucky
5111 
5112                 newMWE = new MouseWheelEvent(anc, // new source
5113                                              e.getID(),
5114                                              e.getWhen(),
5115                                              e.getModifiers(),
5116                                              newX, // x relative to new source
5117                                              newY, // y relative to new source
5118                                              e.getXOnScreen(),
5119                                              e.getYOnScreen(),
5120                                              e.getClickCount(),
5121                                              e.isPopupTrigger(),
5122                                              e.getScrollType(),
5123                                              e.getScrollAmount(),
5124                                              e.getWheelRotation(),
5125                                              e.getPreciseWheelRotation());
5126                 ((AWTEvent)e).copyPrivateDataInto(newMWE);
5127                 // When dispatching a wheel event to
5128                 // ancestor, there is no need trying to find descendant
5129                 // lightweights to dispatch event to.
5130                 // If we dispatch the event to toplevel ancestor,
5131                 // this could enclose the loop: 6480024.
5132                 anc.dispatchEventToSelf(newMWE);
5133                 if (newMWE.isConsumed()) {
5134                     e.consume();
5135                 }
5136                 return true;
5137             }
5138         }
5139         return false;
5140     }
5141 
5142     boolean areInputMethodsEnabled() {
5143         // in 1.2, we assume input method support is required for all
5144         // components that handle key events, but components can turn off
5145         // input methods by calling enableInputMethods(false).
5146         return ((eventMask & AWTEvent.INPUT_METHODS_ENABLED_MASK) != 0) &&
5147             ((eventMask & AWTEvent.KEY_EVENT_MASK) != 0 || keyListener != null);
5148     }
5149 
5150     // REMIND: remove when filtering is handled at lower level
5151     boolean eventEnabled(AWTEvent e) {
5152         return eventTypeEnabled(e.id);
5153     }
5154 
5155     boolean eventTypeEnabled(int type) {
5156         switch(type) {
5157           case ComponentEvent.COMPONENT_MOVED:
5158           case ComponentEvent.COMPONENT_RESIZED:
5159           case ComponentEvent.COMPONENT_SHOWN:
5160           case ComponentEvent.COMPONENT_HIDDEN:
5161               if ((eventMask & AWTEvent.COMPONENT_EVENT_MASK) != 0 ||
5162                   componentListener != null) {
5163                   return true;
5164               }
5165               break;
5166           case FocusEvent.FOCUS_GAINED:
5167           case FocusEvent.FOCUS_LOST:
5168               if ((eventMask & AWTEvent.FOCUS_EVENT_MASK) != 0 ||
5169                   focusListener != null) {
5170                   return true;
5171               }
5172               break;
5173           case KeyEvent.KEY_PRESSED:
5174           case KeyEvent.KEY_RELEASED:
5175           case KeyEvent.KEY_TYPED:
5176               if ((eventMask & AWTEvent.KEY_EVENT_MASK) != 0 ||
5177                   keyListener != null) {
5178                   return true;
5179               }
5180               break;
5181           case MouseEvent.MOUSE_PRESSED:
5182           case MouseEvent.MOUSE_RELEASED:
5183           case MouseEvent.MOUSE_ENTERED:
5184           case MouseEvent.MOUSE_EXITED:
5185           case MouseEvent.MOUSE_CLICKED:
5186               if ((eventMask & AWTEvent.MOUSE_EVENT_MASK) != 0 ||
5187                   mouseListener != null) {
5188                   return true;
5189               }
5190               break;
5191           case MouseEvent.MOUSE_MOVED:
5192           case MouseEvent.MOUSE_DRAGGED:
5193               if ((eventMask & AWTEvent.MOUSE_MOTION_EVENT_MASK) != 0 ||
5194                   mouseMotionListener != null) {
5195                   return true;
5196               }
5197               break;
5198           case MouseEvent.MOUSE_WHEEL:
5199               if ((eventMask & AWTEvent.MOUSE_WHEEL_EVENT_MASK) != 0 ||
5200                   mouseWheelListener != null) {
5201                   return true;
5202               }
5203               break;
5204           case InputMethodEvent.INPUT_METHOD_TEXT_CHANGED:
5205           case InputMethodEvent.CARET_POSITION_CHANGED:
5206               if ((eventMask & AWTEvent.INPUT_METHOD_EVENT_MASK) != 0 ||
5207                   inputMethodListener != null) {
5208                   return true;
5209               }
5210               break;
5211           case HierarchyEvent.HIERARCHY_CHANGED:
5212               if ((eventMask & AWTEvent.HIERARCHY_EVENT_MASK) != 0 ||
5213                   hierarchyListener != null) {
5214                   return true;
5215               }
5216               break;
5217           case HierarchyEvent.ANCESTOR_MOVED:
5218           case HierarchyEvent.ANCESTOR_RESIZED:
5219               if ((eventMask & AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK) != 0 ||
5220                   hierarchyBoundsListener != null) {
5221                   return true;
5222               }
5223               break;
5224           case ActionEvent.ACTION_PERFORMED:
5225               if ((eventMask & AWTEvent.ACTION_EVENT_MASK) != 0) {
5226                   return true;
5227               }
5228               break;
5229           case TextEvent.TEXT_VALUE_CHANGED:
5230               if ((eventMask & AWTEvent.TEXT_EVENT_MASK) != 0) {
5231                   return true;
5232               }
5233               break;
5234           case ItemEvent.ITEM_STATE_CHANGED:
5235               if ((eventMask & AWTEvent.ITEM_EVENT_MASK) != 0) {
5236                   return true;
5237               }
5238               break;
5239           case AdjustmentEvent.ADJUSTMENT_VALUE_CHANGED:
5240               if ((eventMask & AWTEvent.ADJUSTMENT_EVENT_MASK) != 0) {
5241                   return true;
5242               }
5243               break;
5244           default:
5245               break;
5246         }
5247         //
5248         // Always pass on events defined by external programs.
5249         //
5250         if (type > AWTEvent.RESERVED_ID_MAX) {
5251             return true;
5252         }
5253         return false;
5254     }
5255 
5256     /**
5257      * @deprecated As of JDK version 1.1,
5258      * replaced by dispatchEvent(AWTEvent).
5259      */
5260     @Deprecated
5261     public boolean postEvent(Event e) {
5262         ComponentPeer peer = this.peer;
5263 
5264         if (handleEvent(e)) {
5265             e.consume();
5266             return true;
5267         }
5268 
5269         Component parent = this.parent;
5270         int eventx = e.x;
5271         int eventy = e.y;
5272         if (parent != null) {
5273             e.translate(x, y);
5274             if (parent.postEvent(e)) {
5275                 e.consume();
5276                 return true;
5277             }
5278             // restore coords
5279             e.x = eventx;
5280             e.y = eventy;
5281         }
5282         return false;
5283     }
5284 
5285     // Event source interfaces
5286 
5287     /**
5288      * Adds the specified component listener to receive component events from
5289      * this component.
5290      * If listener <code>l</code> is <code>null</code>,
5291      * no exception is thrown and no action is performed.
5292      * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
5293      * >AWT Threading Issues</a> for details on AWT's threading model.
5294      *
5295      * @param    l   the component listener
5296      * @see      java.awt.event.ComponentEvent
5297      * @see      java.awt.event.ComponentListener
5298      * @see      #removeComponentListener
5299      * @see      #getComponentListeners
5300      * @since    1.1
5301      */
5302     public synchronized void addComponentListener(ComponentListener l) {
5303         if (l == null) {
5304             return;
5305         }
5306         componentListener = AWTEventMulticaster.add(componentListener, l);
5307         newEventsOnly = true;
5308     }
5309 
5310     /**
5311      * Removes the specified component listener so that it no longer
5312      * receives component events from this component. This method performs
5313      * no function, nor does it throw an exception, if the listener
5314      * specified by the argument was not previously added to this component.
5315      * If listener <code>l</code> is <code>null</code>,
5316      * no exception is thrown and no action is performed.
5317      * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
5318      * >AWT Threading Issues</a> for details on AWT's threading model.
5319      * @param    l   the component listener
5320      * @see      java.awt.event.ComponentEvent
5321      * @see      java.awt.event.ComponentListener
5322      * @see      #addComponentListener
5323      * @see      #getComponentListeners
5324      * @since    1.1
5325      */
5326     public synchronized void removeComponentListener(ComponentListener l) {
5327         if (l == null) {
5328             return;
5329         }
5330         componentListener = AWTEventMulticaster.remove(componentListener, l);
5331     }
5332 
5333     /**
5334      * Returns an array of all the component listeners
5335      * registered on this component.
5336      *
5337      * @return all <code>ComponentListener</code>s of this component
5338      *         or an empty array if no component
5339      *         listeners are currently registered
5340      *
5341      * @see #addComponentListener
5342      * @see #removeComponentListener
5343      * @since 1.4
5344      */
5345     public synchronized ComponentListener[] getComponentListeners() {
5346         return getListeners(ComponentListener.class);
5347     }
5348 
5349     /**
5350      * Adds the specified focus listener to receive focus events from
5351      * this component when this component gains input focus.
5352      * If listener <code>l</code> is <code>null</code>,
5353      * no exception is thrown and no action is performed.
5354      * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
5355      * >AWT Threading Issues</a> for details on AWT's threading model.
5356      *
5357      * @param    l   the focus listener
5358      * @see      java.awt.event.FocusEvent
5359      * @see      java.awt.event.FocusListener
5360      * @see      #removeFocusListener
5361      * @see      #getFocusListeners
5362      * @since    1.1
5363      */
5364     public synchronized void addFocusListener(FocusListener l) {
5365         if (l == null) {
5366             return;
5367         }
5368         focusListener = AWTEventMulticaster.add(focusListener, l);
5369         newEventsOnly = true;
5370 
5371         // if this is a lightweight component, enable focus events
5372         // in the native container.
5373         if (peer instanceof LightweightPeer) {
5374             parent.proxyEnableEvents(AWTEvent.FOCUS_EVENT_MASK);
5375         }
5376     }
5377 
5378     /**
5379      * Removes the specified focus listener so that it no longer
5380      * receives focus events from this component. This method performs
5381      * no function, nor does it throw an exception, if the listener
5382      * specified by the argument was not previously added to this component.
5383      * If listener <code>l</code> is <code>null</code>,
5384      * no exception is thrown and no action is performed.
5385      * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
5386      * >AWT Threading Issues</a> for details on AWT's threading model.
5387      *
5388      * @param    l   the focus listener
5389      * @see      java.awt.event.FocusEvent
5390      * @see      java.awt.event.FocusListener
5391      * @see      #addFocusListener
5392      * @see      #getFocusListeners
5393      * @since    1.1
5394      */
5395     public synchronized void removeFocusListener(FocusListener l) {
5396         if (l == null) {
5397             return;
5398         }
5399         focusListener = AWTEventMulticaster.remove(focusListener, l);
5400     }
5401 
5402     /**
5403      * Returns an array of all the focus listeners
5404      * registered on this component.
5405      *
5406      * @return all of this component's <code>FocusListener</code>s
5407      *         or an empty array if no component
5408      *         listeners are currently registered
5409      *
5410      * @see #addFocusListener
5411      * @see #removeFocusListener
5412      * @since 1.4
5413      */
5414     public synchronized FocusListener[] getFocusListeners() {
5415         return getListeners(FocusListener.class);
5416     }
5417 
5418     /**
5419      * Adds the specified hierarchy listener to receive hierarchy changed
5420      * events from this component when the hierarchy to which this container
5421      * belongs changes.
5422      * If listener <code>l</code> is <code>null</code>,
5423      * no exception is thrown and no action is performed.
5424      * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
5425      * >AWT Threading Issues</a> for details on AWT's threading model.
5426      *
5427      * @param    l   the hierarchy listener
5428      * @see      java.awt.event.HierarchyEvent
5429      * @see      java.awt.event.HierarchyListener
5430      * @see      #removeHierarchyListener
5431      * @see      #getHierarchyListeners
5432      * @since    1.3
5433      */
5434     public void addHierarchyListener(HierarchyListener l) {
5435         if (l == null) {
5436             return;
5437         }
5438         boolean notifyAncestors;
5439         synchronized (this) {
5440             notifyAncestors =
5441                 (hierarchyListener == null &&
5442                  (eventMask & AWTEvent.HIERARCHY_EVENT_MASK) == 0);
5443             hierarchyListener = AWTEventMulticaster.add(hierarchyListener, l);
5444             notifyAncestors = (notifyAncestors && hierarchyListener != null);
5445             newEventsOnly = true;
5446         }
5447         if (notifyAncestors) {
5448             synchronized (getTreeLock()) {
5449                 adjustListeningChildrenOnParent(AWTEvent.HIERARCHY_EVENT_MASK,
5450                                                 1);
5451             }
5452         }
5453     }
5454 
5455     /**
5456      * Removes the specified hierarchy listener so that it no longer
5457      * receives hierarchy changed events from this component. This method
5458      * performs no function, nor does it throw an exception, if the listener
5459      * specified by the argument was not previously added to this component.
5460      * If listener <code>l</code> is <code>null</code>,
5461      * no exception is thrown and no action is performed.
5462      * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
5463      * >AWT Threading Issues</a> for details on AWT's threading model.
5464      *
5465      * @param    l   the hierarchy listener
5466      * @see      java.awt.event.HierarchyEvent
5467      * @see      java.awt.event.HierarchyListener
5468      * @see      #addHierarchyListener
5469      * @see      #getHierarchyListeners
5470      * @since    1.3
5471      */
5472     public void removeHierarchyListener(HierarchyListener l) {
5473         if (l == null) {
5474             return;
5475         }
5476         boolean notifyAncestors;
5477         synchronized (this) {
5478             notifyAncestors =
5479                 (hierarchyListener != null &&
5480                  (eventMask & AWTEvent.HIERARCHY_EVENT_MASK) == 0);
5481             hierarchyListener =
5482                 AWTEventMulticaster.remove(hierarchyListener, l);
5483             notifyAncestors = (notifyAncestors && hierarchyListener == null);
5484         }
5485         if (notifyAncestors) {
5486             synchronized (getTreeLock()) {
5487                 adjustListeningChildrenOnParent(AWTEvent.HIERARCHY_EVENT_MASK,
5488                                                 -1);
5489             }
5490         }
5491     }
5492 
5493     /**
5494      * Returns an array of all the hierarchy listeners
5495      * registered on this component.
5496      *
5497      * @return all of this component's <code>HierarchyListener</code>s
5498      *         or an empty array if no hierarchy
5499      *         listeners are currently registered
5500      *
5501      * @see      #addHierarchyListener
5502      * @see      #removeHierarchyListener
5503      * @since    1.4
5504      */
5505     public synchronized HierarchyListener[] getHierarchyListeners() {
5506         return getListeners(HierarchyListener.class);
5507     }
5508 
5509     /**
5510      * Adds the specified hierarchy bounds listener to receive hierarchy
5511      * bounds events from this component when the hierarchy to which this
5512      * container belongs changes.
5513      * If listener <code>l</code> is <code>null</code>,
5514      * no exception is thrown and no action is performed.
5515      * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
5516      * >AWT Threading Issues</a> for details on AWT's threading model.
5517      *
5518      * @param    l   the hierarchy bounds listener
5519      * @see      java.awt.event.HierarchyEvent
5520      * @see      java.awt.event.HierarchyBoundsListener
5521      * @see      #removeHierarchyBoundsListener
5522      * @see      #getHierarchyBoundsListeners
5523      * @since    1.3
5524      */
5525     public void addHierarchyBoundsListener(HierarchyBoundsListener l) {
5526         if (l == null) {
5527             return;
5528         }
5529         boolean notifyAncestors;
5530         synchronized (this) {
5531             notifyAncestors =
5532                 (hierarchyBoundsListener == null &&
5533                  (eventMask & AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK) == 0);
5534             hierarchyBoundsListener =
5535                 AWTEventMulticaster.add(hierarchyBoundsListener, l);
5536             notifyAncestors = (notifyAncestors &&
5537                                hierarchyBoundsListener != null);
5538             newEventsOnly = true;
5539         }
5540         if (notifyAncestors) {
5541             synchronized (getTreeLock()) {
5542                 adjustListeningChildrenOnParent(
5543                                                 AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK, 1);
5544             }
5545         }
5546     }
5547 
5548     /**
5549      * Removes the specified hierarchy bounds listener so that it no longer
5550      * receives hierarchy bounds events from this component. This method
5551      * performs no function, nor does it throw an exception, if the listener
5552      * specified by the argument was not previously added to this component.
5553      * If listener <code>l</code> is <code>null</code>,
5554      * no exception is thrown and no action is performed.
5555      * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
5556      * >AWT Threading Issues</a> for details on AWT's threading model.
5557      *
5558      * @param    l   the hierarchy bounds listener
5559      * @see      java.awt.event.HierarchyEvent
5560      * @see      java.awt.event.HierarchyBoundsListener
5561      * @see      #addHierarchyBoundsListener
5562      * @see      #getHierarchyBoundsListeners
5563      * @since    1.3
5564      */
5565     public void removeHierarchyBoundsListener(HierarchyBoundsListener l) {
5566         if (l == null) {
5567             return;
5568         }
5569         boolean notifyAncestors;
5570         synchronized (this) {
5571             notifyAncestors =
5572                 (hierarchyBoundsListener != null &&
5573                  (eventMask & AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK) == 0);
5574             hierarchyBoundsListener =
5575                 AWTEventMulticaster.remove(hierarchyBoundsListener, l);
5576             notifyAncestors = (notifyAncestors &&
5577                                hierarchyBoundsListener == null);
5578         }
5579         if (notifyAncestors) {
5580             synchronized (getTreeLock()) {
5581                 adjustListeningChildrenOnParent(
5582                                                 AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK, -1);
5583             }
5584         }
5585     }
5586 
5587     // Should only be called while holding the tree lock
5588     int numListening(long mask) {
5589         // One mask or the other, but not neither or both.
5590         if (eventLog.isLoggable(PlatformLogger.Level.FINE)) {
5591             if ((mask != AWTEvent.HIERARCHY_EVENT_MASK) &&
5592                 (mask != AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK))
5593             {
5594                 eventLog.fine("Assertion failed");
5595             }
5596         }
5597         if ((mask == AWTEvent.HIERARCHY_EVENT_MASK &&
5598              (hierarchyListener != null ||
5599               (eventMask & AWTEvent.HIERARCHY_EVENT_MASK) != 0)) ||
5600             (mask == AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK &&
5601              (hierarchyBoundsListener != null ||
5602               (eventMask & AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK) != 0))) {
5603             return 1;
5604         } else {
5605             return 0;
5606         }
5607     }
5608 
5609     // Should only be called while holding tree lock
5610     int countHierarchyMembers() {
5611         return 1;
5612     }
5613     // Should only be called while holding the tree lock
5614     int createHierarchyEvents(int id, Component changed,
5615                               Container changedParent, long changeFlags,
5616                               boolean enabledOnToolkit) {
5617         switch (id) {
5618           case HierarchyEvent.HIERARCHY_CHANGED:
5619               if (hierarchyListener != null ||
5620                   (eventMask & AWTEvent.HIERARCHY_EVENT_MASK) != 0 ||
5621                   enabledOnToolkit) {
5622                   HierarchyEvent e = new HierarchyEvent(this, id, changed,
5623                                                         changedParent,
5624                                                         changeFlags);
5625                   dispatchEvent(e);
5626                   return 1;
5627               }
5628               break;
5629           case HierarchyEvent.ANCESTOR_MOVED:
5630           case HierarchyEvent.ANCESTOR_RESIZED:
5631               if (eventLog.isLoggable(PlatformLogger.Level.FINE)) {
5632                   if (changeFlags != 0) {
5633                       eventLog.fine("Assertion (changeFlags == 0) failed");
5634                   }
5635               }
5636               if (hierarchyBoundsListener != null ||
5637                   (eventMask & AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK) != 0 ||
5638                   enabledOnToolkit) {
5639                   HierarchyEvent e = new HierarchyEvent(this, id, changed,
5640                                                         changedParent);
5641                   dispatchEvent(e);
5642                   return 1;
5643               }
5644               break;
5645           default:
5646               // assert false
5647               if (eventLog.isLoggable(PlatformLogger.Level.FINE)) {
5648                   eventLog.fine("This code must never be reached");
5649               }
5650               break;
5651         }
5652         return 0;
5653     }
5654 
5655     /**
5656      * Returns an array of all the hierarchy bounds listeners
5657      * registered on this component.
5658      *
5659      * @return all of this component's <code>HierarchyBoundsListener</code>s
5660      *         or an empty array if no hierarchy bounds
5661      *         listeners are currently registered
5662      *
5663      * @see      #addHierarchyBoundsListener
5664      * @see      #removeHierarchyBoundsListener
5665      * @since    1.4
5666      */
5667     public synchronized HierarchyBoundsListener[] getHierarchyBoundsListeners() {
5668         return getListeners(HierarchyBoundsListener.class);
5669     }
5670 
5671     /*
5672      * Should only be called while holding the tree lock.
5673      * It's added only for overriding in java.awt.Window
5674      * because parent in Window is owner.
5675      */
5676     void adjustListeningChildrenOnParent(long mask, int num) {
5677         if (parent != null) {
5678             parent.adjustListeningChildren(mask, num);
5679         }
5680     }
5681 
5682     /**
5683      * Adds the specified key listener to receive key events from
5684      * this component.
5685      * If l is null, no exception is thrown and no action is performed.
5686      * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
5687      * >AWT Threading Issues</a> for details on AWT's threading model.
5688      *
5689      * @param    l   the key listener.
5690      * @see      java.awt.event.KeyEvent
5691      * @see      java.awt.event.KeyListener
5692      * @see      #removeKeyListener
5693      * @see      #getKeyListeners
5694      * @since    1.1
5695      */
5696     public synchronized void addKeyListener(KeyListener l) {
5697         if (l == null) {
5698             return;
5699         }
5700         keyListener = AWTEventMulticaster.add(keyListener, l);
5701         newEventsOnly = true;
5702 
5703         // if this is a lightweight component, enable key events
5704         // in the native container.
5705         if (peer instanceof LightweightPeer) {
5706             parent.proxyEnableEvents(AWTEvent.KEY_EVENT_MASK);
5707         }
5708     }
5709 
5710     /**
5711      * Removes the specified key listener so that it no longer
5712      * receives key events from this component. This method performs
5713      * no function, nor does it throw an exception, if the listener
5714      * specified by the argument was not previously added to this component.
5715      * If listener <code>l</code> is <code>null</code>,
5716      * no exception is thrown and no action is performed.
5717      * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
5718      * >AWT Threading Issues</a> for details on AWT's threading model.
5719      *
5720      * @param    l   the key listener
5721      * @see      java.awt.event.KeyEvent
5722      * @see      java.awt.event.KeyListener
5723      * @see      #addKeyListener
5724      * @see      #getKeyListeners
5725      * @since    1.1
5726      */
5727     public synchronized void removeKeyListener(KeyListener l) {
5728         if (l == null) {
5729             return;
5730         }
5731         keyListener = AWTEventMulticaster.remove(keyListener, l);
5732     }
5733 
5734     /**
5735      * Returns an array of all the key listeners
5736      * registered on this component.
5737      *
5738      * @return all of this component's <code>KeyListener</code>s
5739      *         or an empty array if no key
5740      *         listeners are currently registered
5741      *
5742      * @see      #addKeyListener
5743      * @see      #removeKeyListener
5744      * @since    1.4
5745      */
5746     public synchronized KeyListener[] getKeyListeners() {
5747         return getListeners(KeyListener.class);
5748     }
5749 
5750     /**
5751      * Adds the specified mouse listener to receive mouse events from
5752      * this component.
5753      * If listener <code>l</code> is <code>null</code>,
5754      * no exception is thrown and no action is performed.
5755      * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
5756      * >AWT Threading Issues</a> for details on AWT's threading model.
5757      *
5758      * @param    l   the mouse listener
5759      * @see      java.awt.event.MouseEvent
5760      * @see      java.awt.event.MouseListener
5761      * @see      #removeMouseListener
5762      * @see      #getMouseListeners
5763      * @since    1.1
5764      */
5765     public synchronized void addMouseListener(MouseListener l) {
5766         if (l == null) {
5767             return;
5768         }
5769         mouseListener = AWTEventMulticaster.add(mouseListener,l);
5770         newEventsOnly = true;
5771 
5772         // if this is a lightweight component, enable mouse events
5773         // in the native container.
5774         if (peer instanceof LightweightPeer) {
5775             parent.proxyEnableEvents(AWTEvent.MOUSE_EVENT_MASK);
5776         }
5777     }
5778 
5779     /**
5780      * Removes the specified mouse listener so that it no longer
5781      * receives mouse events from this component. This method performs
5782      * no function, nor does it throw an exception, if the listener
5783      * specified by the argument was not previously added to this component.
5784      * If listener <code>l</code> is <code>null</code>,
5785      * no exception is thrown and no action is performed.
5786      * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
5787      * >AWT Threading Issues</a> for details on AWT's threading model.
5788      *
5789      * @param    l   the mouse listener
5790      * @see      java.awt.event.MouseEvent
5791      * @see      java.awt.event.MouseListener
5792      * @see      #addMouseListener
5793      * @see      #getMouseListeners
5794      * @since    1.1
5795      */
5796     public synchronized void removeMouseListener(MouseListener l) {
5797         if (l == null) {
5798             return;
5799         }
5800         mouseListener = AWTEventMulticaster.remove(mouseListener, l);
5801     }
5802 
5803     /**
5804      * Returns an array of all the mouse listeners
5805      * registered on this component.
5806      *
5807      * @return all of this component's <code>MouseListener</code>s
5808      *         or an empty array if no mouse
5809      *         listeners are currently registered
5810      *
5811      * @see      #addMouseListener
5812      * @see      #removeMouseListener
5813      * @since    1.4
5814      */
5815     public synchronized MouseListener[] getMouseListeners() {
5816         return getListeners(MouseListener.class);
5817     }
5818 
5819     /**
5820      * Adds the specified mouse motion listener to receive mouse motion
5821      * events from this component.
5822      * If listener <code>l</code> is <code>null</code>,
5823      * no exception is thrown and no action is performed.
5824      * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
5825      * >AWT Threading Issues</a> for details on AWT's threading model.
5826      *
5827      * @param    l   the mouse motion listener
5828      * @see      java.awt.event.MouseEvent
5829      * @see      java.awt.event.MouseMotionListener
5830      * @see      #removeMouseMotionListener
5831      * @see      #getMouseMotionListeners
5832      * @since    1.1
5833      */
5834     public synchronized void addMouseMotionListener(MouseMotionListener l) {
5835         if (l == null) {
5836             return;
5837         }
5838         mouseMotionListener = AWTEventMulticaster.add(mouseMotionListener,l);
5839         newEventsOnly = true;
5840 
5841         // if this is a lightweight component, enable mouse events
5842         // in the native container.
5843         if (peer instanceof LightweightPeer) {
5844             parent.proxyEnableEvents(AWTEvent.MOUSE_MOTION_EVENT_MASK);
5845         }
5846     }
5847 
5848     /**
5849      * Removes the specified mouse motion listener so that it no longer
5850      * receives mouse motion events from this component. This method performs
5851      * no function, nor does it throw an exception, if the listener
5852      * specified by the argument was not previously added to this component.
5853      * If listener <code>l</code> is <code>null</code>,
5854      * no exception is thrown and no action is performed.
5855      * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
5856      * >AWT Threading Issues</a> for details on AWT's threading model.
5857      *
5858      * @param    l   the mouse motion listener
5859      * @see      java.awt.event.MouseEvent
5860      * @see      java.awt.event.MouseMotionListener
5861      * @see      #addMouseMotionListener
5862      * @see      #getMouseMotionListeners
5863      * @since    1.1
5864      */
5865     public synchronized void removeMouseMotionListener(MouseMotionListener l) {
5866         if (l == null) {
5867             return;
5868         }
5869         mouseMotionListener = AWTEventMulticaster.remove(mouseMotionListener, l);
5870     }
5871 
5872     /**
5873      * Returns an array of all the mouse motion listeners
5874      * registered on this component.
5875      *
5876      * @return all of this component's <code>MouseMotionListener</code>s
5877      *         or an empty array if no mouse motion
5878      *         listeners are currently registered
5879      *
5880      * @see      #addMouseMotionListener
5881      * @see      #removeMouseMotionListener
5882      * @since    1.4
5883      */
5884     public synchronized MouseMotionListener[] getMouseMotionListeners() {
5885         return getListeners(MouseMotionListener.class);
5886     }
5887 
5888     /**
5889      * Adds the specified mouse wheel listener to receive mouse wheel events
5890      * from this component.  Containers also receive mouse wheel events from
5891      * sub-components.
5892      * <p>
5893      * For information on how mouse wheel events are dispatched, see
5894      * the class description for {@link MouseWheelEvent}.
5895      * <p>
5896      * If l is <code>null</code>, no exception is thrown and no
5897      * action is performed.
5898      * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
5899      * >AWT Threading Issues</a> for details on AWT's threading model.
5900      *
5901      * @param    l   the mouse wheel listener
5902      * @see      java.awt.event.MouseWheelEvent
5903      * @see      java.awt.event.MouseWheelListener
5904      * @see      #removeMouseWheelListener
5905      * @see      #getMouseWheelListeners
5906      * @since    1.4
5907      */
5908     public synchronized void addMouseWheelListener(MouseWheelListener l) {
5909         if (l == null) {
5910             return;
5911         }
5912         mouseWheelListener = AWTEventMulticaster.add(mouseWheelListener,l);
5913         newEventsOnly = true;
5914 
5915         // if this is a lightweight component, enable mouse events
5916         // in the native container.
5917         if (peer instanceof LightweightPeer) {
5918             parent.proxyEnableEvents(AWTEvent.MOUSE_WHEEL_EVENT_MASK);
5919         }
5920     }
5921 
5922     /**
5923      * Removes the specified mouse wheel listener so that it no longer
5924      * receives mouse wheel events from this component. This method performs
5925      * no function, nor does it throw an exception, if the listener
5926      * specified by the argument was not previously added to this component.
5927      * If l is null, no exception is thrown and no action is performed.
5928      * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
5929      * >AWT Threading Issues</a> for details on AWT's threading model.
5930      *
5931      * @param    l   the mouse wheel listener.
5932      * @see      java.awt.event.MouseWheelEvent
5933      * @see      java.awt.event.MouseWheelListener
5934      * @see      #addMouseWheelListener
5935      * @see      #getMouseWheelListeners
5936      * @since    1.4
5937      */
5938     public synchronized void removeMouseWheelListener(MouseWheelListener l) {
5939         if (l == null) {
5940             return;
5941         }
5942         mouseWheelListener = AWTEventMulticaster.remove(mouseWheelListener, l);
5943     }
5944 
5945     /**
5946      * Returns an array of all the mouse wheel listeners
5947      * registered on this component.
5948      *
5949      * @return all of this component's <code>MouseWheelListener</code>s
5950      *         or an empty array if no mouse wheel
5951      *         listeners are currently registered
5952      *
5953      * @see      #addMouseWheelListener
5954      * @see      #removeMouseWheelListener
5955      * @since    1.4
5956      */
5957     public synchronized MouseWheelListener[] getMouseWheelListeners() {
5958         return getListeners(MouseWheelListener.class);
5959     }
5960 
5961     /**
5962      * Adds the specified input method listener to receive
5963      * input method events from this component. A component will
5964      * only receive input method events from input methods
5965      * if it also overrides <code>getInputMethodRequests</code> to return an
5966      * <code>InputMethodRequests</code> instance.
5967      * If listener <code>l</code> is <code>null</code>,
5968      * no exception is thrown and no action is performed.
5969      * <p>Refer to <a href="{@docRoot}/java/awt/doc-files/AWTThreadIssues.html#ListenersThreads"
5970      * >AWT Threading Issues</a> for details on AWT's threading model.
5971      *
5972      * @param    l   the input method listener
5973      * @see      java.awt.event.InputMethodEvent
5974      * @see      java.awt.event.InputMethodListener
5975      * @see      #removeInputMethodListener
5976      * @see      #getInputMethodListeners
5977      * @see      #getInputMethodRequests
5978      * @since    1.2
5979      */
5980     public synchronized void addInputMethodListener(InputMethodListener l) {
5981         if (l == null) {
5982             return;
5983         }
5984         inputMethodListener = AWTEventMulticaster.add(inputMethodListener, l);
5985         newEventsOnly = true;
5986     }
5987 
5988     /**
5989      * Removes the specified input method listener so that it no longer
5990      * receives input method events from this component. This method performs
5991      * no function, nor does it throw an exception, if the listener
5992      * specified by the argument was not previously added to this component.
5993      * If listener <code>l</code> is <code>null</code>,
5994      * no exception is thrown and no action is performed.
5995      * <p>Refer to <a href="doc-files/AWTThreadIssues.html#ListenersThreads"
5996      * >AWT Threading Issues</a> for details on AWT's threading model.
5997      *
5998      * @param    l   the input method listener
5999      * @see      java.awt.event.InputMethodEvent
6000      * @see      java.awt.event.InputMethodListener
6001      * @see      #addInputMethodListener
6002      * @see      #getInputMethodListeners
6003      * @since    1.2
6004      */
6005     public synchronized void removeInputMethodListener(InputMethodListener l) {
6006         if (l == null) {
6007             return;
6008         }
6009         inputMethodListener = AWTEventMulticaster.remove(inputMethodListener, l);
6010     }
6011 
6012     /**
6013      * Returns an array of all the input method listeners
6014      * registered on this component.
6015      *
6016      * @return all of this component's <code>InputMethodListener</code>s
6017      *         or an empty array if no input method
6018      *         listeners are currently registered
6019      *
6020      * @see      #addInputMethodListener
6021      * @see      #removeInputMethodListener
6022      * @since    1.4
6023      */
6024     public synchronized InputMethodListener[] getInputMethodListeners() {
6025         return getListeners(InputMethodListener.class);
6026     }
6027 
6028     /**
6029      * Returns an array of all the objects currently registered
6030      * as <code><em>Foo</em>Listener</code>s
6031      * upon this <code>Component</code>.
6032      * <code><em>Foo</em>Listener</code>s are registered using the
6033      * <code>add<em>Foo</em>Listener</code> method.
6034      *
6035      * <p>
6036      * You can specify the <code>listenerType</code> argument
6037      * with a class literal, such as
6038      * <code><em>Foo</em>Listener.class</code>.
6039      * For example, you can query a
6040      * <code>Component</code> <code>c</code>
6041      * for its mouse listeners with the following code:
6042      *
6043      * <pre>MouseListener[] mls = (MouseListener[])(c.getListeners(MouseListener.class));</pre>
6044      *
6045      * If no such listeners exist, this method returns an empty array.
6046      *
6047      * @param <T> the type of the listeners
6048      * @param listenerType the type of listeners requested; this parameter
6049      *          should specify an interface that descends from
6050      *          <code>java.util.EventListener</code>
6051      * @return an array of all objects registered as
6052      *          <code><em>Foo</em>Listener</code>s on this component,
6053      *          or an empty array if no such listeners have been added
6054      * @exception ClassCastException if <code>listenerType</code>
6055      *          doesn't specify a class or interface that implements
6056      *          <code>java.util.EventListener</code>
6057      * @throws NullPointerException if {@code listenerType} is {@code null}
6058      * @see #getComponentListeners
6059      * @see #getFocusListeners
6060      * @see #getHierarchyListeners
6061      * @see #getHierarchyBoundsListeners
6062      * @see #getKeyListeners
6063      * @see #getMouseListeners
6064      * @see #getMouseMotionListeners
6065      * @see #getMouseWheelListeners
6066      * @see #getInputMethodListeners
6067      * @see #getPropertyChangeListeners
6068      *
6069      * @since 1.3
6070      */
6071     @SuppressWarnings("unchecked")
6072     public <T extends EventListener> T[] getListeners(Class<T> listenerType) {
6073         EventListener l = null;
6074         if  (listenerType == ComponentListener.class) {
6075             l = componentListener;
6076         } else if (listenerType == FocusListener.class) {
6077             l = focusListener;
6078         } else if (listenerType == HierarchyListener.class) {
6079             l = hierarchyListener;
6080         } else if (listenerType == HierarchyBoundsListener.class) {
6081             l = hierarchyBoundsListener;
6082         } else if (listenerType == KeyListener.class) {
6083             l = keyListener;
6084         } else if (listenerType == MouseListener.class) {
6085             l = mouseListener;
6086         } else if (listenerType == MouseMotionListener.class) {
6087             l = mouseMotionListener;
6088         } else if (listenerType == MouseWheelListener.class) {
6089             l = mouseWheelListener;
6090         } else if (listenerType == InputMethodListener.class) {
6091             l = inputMethodListener;
6092         } else if (listenerType == PropertyChangeListener.class) {
6093             return (T[])getPropertyChangeListeners();
6094         }
6095         return AWTEventMulticaster.getListeners(l, listenerType);
6096     }
6097 
6098     /**
6099      * Gets the input method request handler which supports
6100      * requests from input methods for this component. A component
6101      * that supports on-the-spot text input must override this
6102      * method to return an <code>InputMethodRequests</code> instance.
6103      * At the same time, it also has to handle input method events.
6104      *
6105      * @return the input method request handler for this component,
6106      *          <code>null</code> by default
6107      * @see #addInputMethodListener
6108      * @since 1.2
6109      */
6110     public InputMethodRequests getInputMethodRequests() {
6111         return null;
6112     }
6113 
6114     /**
6115      * Gets the input context used by this component for handling
6116      * the communication with input methods when text is entered
6117      * in this component. By default, the input context used for
6118      * the parent component is returned. Components may
6119      * override this to return a private input context.
6120      *
6121      * @return the input context used by this component;
6122      *          <code>null</code> if no context can be determined
6123      * @since 1.2
6124      */
6125     public InputContext getInputContext() {
6126         Container parent = this.parent;
6127         if (parent == null) {
6128             return null;
6129         } else {
6130             return parent.getInputContext();
6131         }
6132     }
6133 
6134     /**
6135      * Enables the events defined by the specified event mask parameter
6136      * to be delivered to this component.
6137      * <p>
6138      * Event types are automatically enabled when a listener for
6139      * that event type is added to the component.
6140      * <p>
6141      * This method only needs to be invoked by subclasses of
6142      * <code>Component</code> which desire to have the specified event
6143      * types delivered to <code>processEvent</code> regardless of whether
6144      * or not a listener is registered.
6145      * @param      eventsToEnable   the event mask defining the event types
6146      * @see        #processEvent
6147      * @see        #disableEvents
6148      * @see        AWTEvent
6149      * @since      1.1
6150      */
6151     protected final void enableEvents(long eventsToEnable) {
6152         long notifyAncestors = 0;
6153         synchronized (this) {
6154             if ((eventsToEnable & AWTEvent.HIERARCHY_EVENT_MASK) != 0 &&
6155                 hierarchyListener == null &&
6156                 (eventMask & AWTEvent.HIERARCHY_EVENT_MASK) == 0) {
6157                 notifyAncestors |= AWTEvent.HIERARCHY_EVENT_MASK;
6158             }
6159             if ((eventsToEnable & AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK) != 0 &&
6160                 hierarchyBoundsListener == null &&
6161                 (eventMask & AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK) == 0) {
6162                 notifyAncestors |= AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK;
6163             }
6164             eventMask |= eventsToEnable;
6165             newEventsOnly = true;
6166         }
6167 
6168         // if this is a lightweight component, enable mouse events
6169         // in the native container.
6170         if (peer instanceof LightweightPeer) {
6171             parent.proxyEnableEvents(eventMask);
6172         }
6173         if (notifyAncestors != 0) {
6174             synchronized (getTreeLock()) {
6175                 adjustListeningChildrenOnParent(notifyAncestors, 1);
6176             }
6177         }
6178     }
6179 
6180     /**
6181      * Disables the events defined by the specified event mask parameter
6182      * from being delivered to this component.
6183      * @param      eventsToDisable   the event mask defining the event types
6184      * @see        #enableEvents
6185      * @since      1.1
6186      */
6187     protected final void disableEvents(long eventsToDisable) {
6188         long notifyAncestors = 0;
6189         synchronized (this) {
6190             if ((eventsToDisable & AWTEvent.HIERARCHY_EVENT_MASK) != 0 &&
6191                 hierarchyListener == null &&
6192                 (eventMask & AWTEvent.HIERARCHY_EVENT_MASK) != 0) {
6193                 notifyAncestors |= AWTEvent.HIERARCHY_EVENT_MASK;
6194             }
6195             if ((eventsToDisable & AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK)!=0 &&
6196                 hierarchyBoundsListener == null &&
6197                 (eventMask & AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK) != 0) {
6198                 notifyAncestors |= AWTEvent.HIERARCHY_BOUNDS_EVENT_MASK;
6199             }
6200             eventMask &= ~eventsToDisable;
6201         }
6202         if (notifyAncestors != 0) {
6203             synchronized (getTreeLock()) {
6204                 adjustListeningChildrenOnParent(notifyAncestors, -1);
6205             }
6206         }
6207     }
6208 
6209     transient sun.awt.EventQueueItem[] eventCache;
6210 
6211     /**
6212      * @see #isCoalescingEnabled
6213      * @see #checkCoalescing
6214      */
6215     private transient boolean coalescingEnabled = checkCoalescing();
6216 
6217     /**
6218      * Weak map of known coalesceEvent overriders.
6219      * Value indicates whether overriden.
6220      * Bootstrap classes are not included.
6221      */
6222     private static final Map<Class<?>, Boolean> coalesceMap =
6223         new java.util.WeakHashMap<Class<?>, Boolean>();
6224 
6225     /**
6226      * Indicates whether this class overrides coalesceEvents.
6227      * It is assumed that all classes that are loaded from the bootstrap
6228      *   do not.
6229      * The bootstrap class loader is assumed to be represented by null.
6230      * We do not check that the method really overrides
6231      *   (it might be static, private or package private).
6232      */
6233      private boolean checkCoalescing() {
6234          if (getClass().getClassLoader()==null) {
6235              return false;
6236          }
6237          final Class<? extends Component> clazz = getClass();
6238          synchronized (coalesceMap) {
6239              // Check cache.
6240              Boolean value = coalesceMap.get(clazz);
6241              if (value != null) {
6242                  return value;
6243              }
6244 
6245              // Need to check non-bootstraps.
6246              Boolean enabled = java.security.AccessController.doPrivileged(
6247                  new java.security.PrivilegedAction<Boolean>() {
6248                      public Boolean run() {
6249                          return isCoalesceEventsOverriden(clazz);
6250                      }
6251                  }
6252                  );
6253              coalesceMap.put(clazz, enabled);
6254              return enabled;
6255          }
6256      }
6257 
6258     /**
6259      * Parameter types of coalesceEvents(AWTEvent,AWTEVent).
6260      */
6261     private static final Class<?>[] coalesceEventsParams = {
6262         AWTEvent.class, AWTEvent.class
6263     };
6264 
6265     /**
6266      * Indicates whether a class or its superclasses override coalesceEvents.
6267      * Must be called with lock on coalesceMap and privileged.
6268      * @see checkCoalescing
6269      */
6270     private static boolean isCoalesceEventsOverriden(Class<?> clazz) {
6271         assert Thread.holdsLock(coalesceMap);
6272 
6273         // First check superclass - we may not need to bother ourselves.
6274         Class<?> superclass = clazz.getSuperclass();
6275         if (superclass == null) {
6276             // Only occurs on implementations that
6277             //   do not use null to represent the bootstrap class loader.
6278             return false;
6279         }
6280         if (superclass.getClassLoader() != null) {
6281             Boolean value = coalesceMap.get(superclass);
6282             if (value == null) {
6283                 // Not done already - recurse.
6284                 if (isCoalesceEventsOverriden(superclass)) {
6285                     coalesceMap.put(superclass, true);
6286                     return true;
6287                 }
6288             } else if (value) {
6289                 return true;
6290             }
6291         }
6292 
6293         try {
6294             // Throws if not overriden.
6295             clazz.getDeclaredMethod(
6296                 "coalesceEvents", coalesceEventsParams
6297                 );
6298             return true;
6299         } catch (NoSuchMethodException e) {
6300             // Not present in this class.
6301             return false;
6302         }
6303     }
6304 
6305     /**
6306      * Indicates whether coalesceEvents may do something.
6307      */
6308     final boolean isCoalescingEnabled() {
6309         return coalescingEnabled;
6310      }
6311 
6312 
6313     /**
6314      * Potentially coalesce an event being posted with an existing
6315      * event.  This method is called by <code>EventQueue.postEvent</code>
6316      * if an event with the same ID as the event to be posted is found in
6317      * the queue (both events must have this component as their source).
6318      * This method either returns a coalesced event which replaces
6319      * the existing event (and the new event is then discarded), or
6320      * <code>null</code> to indicate that no combining should be done
6321      * (add the second event to the end of the queue).  Either event
6322      * parameter may be modified and returned, as the other one is discarded
6323      * unless <code>null</code> is returned.
6324      * <p>
6325      * This implementation of <code>coalesceEvents</code> coalesces
6326      * two event types: mouse move (and drag) events,
6327      * and paint (and update) events.
6328      * For mouse move events the last event is always returned, causing
6329      * intermediate moves to be discarded.  For paint events, the new
6330      * event is coalesced into a complex <code>RepaintArea</code> in the peer.
6331      * The new <code>AWTEvent</code> is always returned.
6332      *
6333      * @param  existingEvent  the event already on the <code>EventQueue</code>
6334      * @param  newEvent       the event being posted to the
6335      *          <code>EventQueue</code>
6336      * @return a coalesced event, or <code>null</code> indicating that no
6337      *          coalescing was done
6338      */
6339     protected AWTEvent coalesceEvents(AWTEvent existingEvent,
6340                                       AWTEvent newEvent) {
6341         return null;
6342     }
6343 
6344     /**
6345      * Processes events occurring on this component. By default this
6346      * method calls the appropriate
6347      * <code>process&lt;event&nbsp;type&gt;Event</code>
6348      * method for the given class of event.
6349      * <p>Note that if the event parameter is <code>null</code>
6350      * the behavior is unspecified and may result in an
6351      * exception.
6352      *
6353      * @param     e the event
6354      * @see       #processComponentEvent
6355      * @see       #processFocusEvent
6356      * @see       #processKeyEvent
6357      * @see       #processMouseEvent
6358      * @see       #processMouseMotionEvent
6359      * @see       #processInputMethodEvent
6360      * @see       #processHierarchyEvent
6361      * @see       #processMouseWheelEvent
6362      * @since     1.1
6363      */
6364     protected void processEvent(AWTEvent e) {
6365         if (e instanceof FocusEvent) {
6366             processFocusEvent((FocusEvent)e);
6367 
6368         } else if (e instanceof MouseEvent) {
6369             switch(e.getID()) {
6370               case MouseEvent.MOUSE_PRESSED:
6371               case MouseEvent.MOUSE_RELEASED:
6372               case MouseEvent.MOUSE_CLICKED:
6373               case MouseEvent.MOUSE_ENTERED:
6374               case MouseEvent.MOUSE_EXITED:
6375                   processMouseEvent((MouseEvent)e);
6376                   break;
6377               case MouseEvent.MOUSE_MOVED:
6378               case MouseEvent.MOUSE_DRAGGED:
6379                   processMouseMotionEvent((MouseEvent)e);
6380                   break;
6381               case MouseEvent.MOUSE_WHEEL:
6382                   processMouseWheelEvent((MouseWheelEvent)e);
6383                   break;
6384             }
6385 
6386         } else if (e instanceof KeyEvent) {
6387             processKeyEvent((KeyEvent)e);
6388 
6389         } else if (e instanceof ComponentEvent) {
6390             processComponentEvent((ComponentEvent)e);
6391         } else if (e instanceof InputMethodEvent) {
6392             processInputMethodEvent((InputMethodEvent)e);
6393         } else if (e instanceof HierarchyEvent) {
6394             switch (e.getID()) {
6395               case HierarchyEvent.HIERARCHY_CHANGED:
6396                   processHierarchyEvent((HierarchyEvent)e);
6397                   break;
6398               case HierarchyEvent.ANCESTOR_MOVED:
6399               case HierarchyEvent.ANCESTOR_RESIZED:
6400                   processHierarchyBoundsEvent((HierarchyEvent)e);
6401                   break;
6402             }
6403         }
6404     }
6405 
6406     /**
6407      * Processes component events occurring on this component by
6408      * dispatching them to any registered
6409      * <code>ComponentListener</code> objects.
6410      * <p>
6411      * This method is not called unless component events are
6412      * enabled for this component. Component events are enabled
6413      * when one of the following occurs:
6414      * <ul>
6415      * <li>A <code>ComponentListener</code> object is registered
6416      * via <code>addComponentListener</code>.
6417      * <li>Component events are enabled via <code>enableEvents</code>.
6418      * </ul>
6419      * <p>Note that if the event parameter is <code>null</code>
6420      * the behavior is unspecified and may result in an
6421      * exception.
6422      *
6423      * @param       e the component event
6424      * @see         java.awt.event.ComponentEvent
6425      * @see         java.awt.event.ComponentListener
6426      * @see         #addComponentListener
6427      * @see         #enableEvents
6428      * @since       1.1
6429      */
6430     protected void processComponentEvent(ComponentEvent e) {
6431         ComponentListener listener = componentListener;
6432         if (listener != null) {
6433             int id = e.getID();
6434             switch(id) {
6435               case ComponentEvent.COMPONENT_RESIZED:
6436                   listener.componentResized(e);
6437                   break;
6438               case ComponentEvent.COMPONENT_MOVED:
6439                   listener.componentMoved(e);
6440                   break;
6441               case ComponentEvent.COMPONENT_SHOWN:
6442                   listener.componentShown(e);
6443                   break;
6444               case ComponentEvent.COMPONENT_HIDDEN:
6445                   listener.componentHidden(e);
6446                   break;
6447             }
6448         }
6449     }
6450 
6451     /**
6452      * Processes focus events occurring on this component by
6453      * dispatching them to any registered
6454      * <code>FocusListener</code> objects.
6455      * <p>
6456      * This method is not called unless focus events are
6457      * enabled for this component. Focus events are enabled
6458      * when one of the following occurs:
6459      * <ul>
6460      * <li>A <code>FocusListener</code> object is registered
6461      * via <code>addFocusListener</code>.
6462      * <li>Focus events are enabled via <code>enableEvents</code>.
6463      * </ul>
6464      * <p>
6465      * If focus events are enabled for a <code>Component</code>,
6466      * the current <code>KeyboardFocusManager</code> determines
6467      * whether or not a focus event should be dispatched to
6468      * registered <code>FocusListener</code> objects.  If the
6469      * events are to be dispatched, the <code>KeyboardFocusManager</code>
6470      * calls the <code>Component</code>'s <code>dispatchEvent</code>
6471      * method, which results in a call to the <code>Component</code>'s
6472      * <code>processFocusEvent</code> method.
6473      * <p>
6474      * If focus events are enabled for a <code>Component</code>, calling
6475      * the <code>Component</code>'s <code>dispatchEvent</code> method
6476      * with a <code>FocusEvent</code> as the argument will result in a
6477      * call to the <code>Component</code>'s <code>processFocusEvent</code>
6478      * method regardless of the current <code>KeyboardFocusManager</code>.
6479      *
6480      * <p>Note that if the event parameter is <code>null</code>
6481      * the behavior is unspecified and may result in an
6482      * exception.
6483      *
6484      * @param       e the focus event
6485      * @see         java.awt.event.FocusEvent
6486      * @see         java.awt.event.FocusListener
6487      * @see         java.awt.KeyboardFocusManager
6488      * @see         #addFocusListener
6489      * @see         #enableEvents
6490      * @see         #dispatchEvent
6491      * @since       1.1
6492      */
6493     protected void processFocusEvent(FocusEvent e) {
6494         FocusListener listener = focusListener;
6495         if (listener != null) {
6496             int id = e.getID();
6497             switch(id) {
6498               case FocusEvent.FOCUS_GAINED:
6499                   listener.focusGained(e);
6500                   break;
6501               case FocusEvent.FOCUS_LOST:
6502                   listener.focusLost(e);
6503                   break;
6504             }
6505         }
6506     }
6507 
6508     /**
6509      * Processes key events occurring on this component by
6510      * dispatching them to any registered
6511      * <code>KeyListener</code> objects.
6512      * <p>
6513      * This method is not called unless key events are
6514      * enabled for this component. Key events are enabled
6515      * when one of the following occurs:
6516      * <ul>
6517      * <li>A <code>KeyListener</code> object is registered
6518      * via <code>addKeyListener</code>.
6519      * <li>Key events are enabled via <code>enableEvents</code>.
6520      * </ul>
6521      *
6522      * <p>
6523      * If key events are enabled for a <code>Component</code>,
6524      * the current <code>KeyboardFocusManager</code> determines
6525      * whether or not a key event should be dispatched to
6526      * registered <code>KeyListener</code> objects.  The
6527      * <code>DefaultKeyboardFocusManager</code> will not dispatch
6528      * key events to a <code>Component</code> that is not the focus
6529      * owner or is not showing.
6530      * <p>
6531      * As of J2SE 1.4, <code>KeyEvent</code>s are redirected to
6532      * the focus owner. Please see the
6533      * <a href="doc-files/FocusSpec.html">Focus Specification</a>
6534      * for further information.
6535      * <p>
6536      * Calling a <code>Component</code>'s <code>dispatchEvent</code>
6537      * method with a <code>KeyEvent</code> as the argument will
6538      * result in a call to the <code>Component</code>'s
6539      * <code>processKeyEvent</code> method regardless of the
6540      * current <code>KeyboardFocusManager</code> as long as the
6541      * component is showing, focused, and enabled, and key events
6542      * are enabled on it.
6543      * <p>If the event parameter is <code>null</code>
6544      * the behavior is unspecified and may result in an
6545      * exception.
6546      *
6547      * @param       e the key event
6548      * @see         java.awt.event.KeyEvent
6549      * @see         java.awt.event.KeyListener
6550      * @see         java.awt.KeyboardFocusManager
6551      * @see         java.awt.DefaultKeyboardFocusManager
6552      * @see         #processEvent
6553      * @see         #dispatchEvent
6554      * @see         #addKeyListener
6555      * @see         #enableEvents
6556      * @see         #isShowing
6557      * @since       1.1
6558      */
6559     protected void processKeyEvent(KeyEvent e) {
6560         KeyListener listener = keyListener;
6561         if (listener != null) {
6562             int id = e.getID();
6563             switch(id) {
6564               case KeyEvent.KEY_TYPED:
6565                   listener.keyTyped(e);
6566                   break;
6567               case KeyEvent.KEY_PRESSED:
6568                   listener.keyPressed(e);
6569                   break;
6570               case KeyEvent.KEY_RELEASED:
6571                   listener.keyReleased(e);
6572                   break;
6573             }
6574         }
6575     }
6576 
6577     /**
6578      * Processes mouse events occurring on this component by
6579      * dispatching them to any registered
6580      * <code>MouseListener</code> objects.
6581      * <p>
6582      * This method is not called unless mouse events are
6583      * enabled for this component. Mouse events are enabled
6584      * when one of the following occurs:
6585      * <ul>
6586      * <li>A <code>MouseListener</code> object is registered
6587      * via <code>addMouseListener</code>.
6588      * <li>Mouse events are enabled via <code>enableEvents</code>.
6589      * </ul>
6590      * <p>Note that if the event parameter is <code>null</code>
6591      * the behavior is unspecified and may result in an
6592      * exception.
6593      *
6594      * @param       e the mouse event
6595      * @see         java.awt.event.MouseEvent
6596      * @see         java.awt.event.MouseListener
6597      * @see         #addMouseListener
6598      * @see         #enableEvents
6599      * @since       1.1
6600      */
6601     protected void processMouseEvent(MouseEvent e) {
6602         MouseListener listener = mouseListener;
6603         if (listener != null) {
6604             int id = e.getID();
6605             switch(id) {
6606               case MouseEvent.MOUSE_PRESSED:
6607                   listener.mousePressed(e);
6608                   break;
6609               case MouseEvent.MOUSE_RELEASED:
6610                   listener.mouseReleased(e);
6611                   break;
6612               case MouseEvent.MOUSE_CLICKED:
6613                   listener.mouseClicked(e);
6614                   break;
6615               case MouseEvent.MOUSE_EXITED:
6616                   listener.mouseExited(e);
6617                   break;
6618               case MouseEvent.MOUSE_ENTERED:
6619                   listener.mouseEntered(e);
6620                   break;
6621             }
6622         }
6623     }
6624 
6625     /**
6626      * Processes mouse motion events occurring on this component by
6627      * dispatching them to any registered
6628      * <code>MouseMotionListener</code> objects.
6629      * <p>
6630      * This method is not called unless mouse motion events are
6631      * enabled for this component. Mouse motion events are enabled
6632      * when one of the following occurs:
6633      * <ul>
6634      * <li>A <code>MouseMotionListener</code> object is registered
6635      * via <code>addMouseMotionListener</code>.
6636      * <li>Mouse motion events are enabled via <code>enableEvents</code>.
6637      * </ul>
6638      * <p>Note that if the event parameter is <code>null</code>
6639      * the behavior is unspecified and may result in an
6640      * exception.
6641      *
6642      * @param       e the mouse motion event
6643      * @see         java.awt.event.MouseEvent
6644      * @see         java.awt.event.MouseMotionListener
6645      * @see         #addMouseMotionListener
6646      * @see         #enableEvents
6647      * @since       1.1
6648      */
6649     protected void processMouseMotionEvent(MouseEvent e) {
6650         MouseMotionListener listener = mouseMotionListener;
6651         if (listener != null) {
6652             int id = e.getID();
6653             switch(id) {
6654               case MouseEvent.MOUSE_MOVED:
6655                   listener.mouseMoved(e);
6656                   break;
6657               case MouseEvent.MOUSE_DRAGGED:
6658                   listener.mouseDragged(e);
6659                   break;
6660             }
6661         }
6662     }
6663 
6664     /**
6665      * Processes mouse wheel events occurring on this component by
6666      * dispatching them to any registered
6667      * <code>MouseWheelListener</code> objects.
6668      * <p>
6669      * This method is not called unless mouse wheel events are
6670      * enabled for this component. Mouse wheel events are enabled
6671      * when one of the following occurs:
6672      * <ul>
6673      * <li>A <code>MouseWheelListener</code> object is registered
6674      * via <code>addMouseWheelListener</code>.
6675      * <li>Mouse wheel events are enabled via <code>enableEvents</code>.
6676      * </ul>
6677      * <p>
6678      * For information on how mouse wheel events are dispatched, see
6679      * the class description for {@link MouseWheelEvent}.
6680      * <p>
6681      * Note that if the event parameter is <code>null</code>
6682      * the behavior is unspecified and may result in an
6683      * exception.
6684      *
6685      * @param       e the mouse wheel event
6686      * @see         java.awt.event.MouseWheelEvent
6687      * @see         java.awt.event.MouseWheelListener
6688      * @see         #addMouseWheelListener
6689      * @see         #enableEvents
6690      * @since       1.4
6691      */
6692     protected void processMouseWheelEvent(MouseWheelEvent e) {
6693         MouseWheelListener listener = mouseWheelListener;
6694         if (listener != null) {
6695             int id = e.getID();
6696             switch(id) {
6697               case MouseEvent.MOUSE_WHEEL:
6698                   listener.mouseWheelMoved(e);
6699                   break;
6700             }
6701         }
6702     }
6703 
6704     boolean postsOldMouseEvents() {
6705         return false;
6706     }
6707 
6708     /**
6709      * Processes input method events occurring on this component by
6710      * dispatching them to any registered
6711      * <code>InputMethodListener</code> objects.
6712      * <p>
6713      * This method is not called unless input method events
6714      * are enabled for this component. Input method events are enabled
6715      * when one of the following occurs:
6716      * <ul>
6717      * <li>An <code>InputMethodListener</code> object is registered
6718      * via <code>addInputMethodListener</code>.
6719      * <li>Input method events are enabled via <code>enableEvents</code>.
6720      * </ul>
6721      * <p>Note that if the event parameter is <code>null</code>
6722      * the behavior is unspecified and may result in an
6723      * exception.
6724      *
6725      * @param       e the input method event
6726      * @see         java.awt.event.InputMethodEvent
6727      * @see         java.awt.event.InputMethodListener
6728      * @see         #addInputMethodListener
6729      * @see         #enableEvents
6730      * @since       1.2
6731      */
6732     protected void processInputMethodEvent(InputMethodEvent e) {
6733         InputMethodListener listener = inputMethodListener;
6734         if (listener != null) {
6735             int id = e.getID();
6736             switch (id) {
6737               case InputMethodEvent.INPUT_METHOD_TEXT_CHANGED:
6738                   listener.inputMethodTextChanged(e);
6739                   break;
6740               case InputMethodEvent.CARET_POSITION_CHANGED:
6741                   listener.caretPositionChanged(e);
6742                   break;
6743             }
6744         }
6745     }
6746 
6747     /**
6748      * Processes hierarchy events occurring on this component by
6749      * dispatching them to any registered
6750      * <code>HierarchyListener</code> objects.
6751      * <p>
6752      * This method is not called unless hierarchy events
6753      * are enabled for this component. Hierarchy events are enabled
6754      * when one of the following occurs:
6755      * <ul>
6756      * <li>An <code>HierarchyListener</code> object is registered
6757      * via <code>addHierarchyListener</code>.
6758      * <li>Hierarchy events are enabled via <code>enableEvents</code>.
6759      * </ul>
6760      * <p>Note that if the event parameter is <code>null</code>
6761      * the behavior is unspecified and may result in an
6762      * exception.
6763      *
6764      * @param       e the hierarchy event
6765      * @see         java.awt.event.HierarchyEvent
6766      * @see         java.awt.event.HierarchyListener
6767      * @see         #addHierarchyListener
6768      * @see         #enableEvents
6769      * @since       1.3
6770      */
6771     protected void processHierarchyEvent(HierarchyEvent e) {
6772         HierarchyListener listener = hierarchyListener;
6773         if (listener != null) {
6774             int id = e.getID();
6775             switch (id) {
6776               case HierarchyEvent.HIERARCHY_CHANGED:
6777                   listener.hierarchyChanged(e);
6778                   break;
6779             }
6780         }
6781     }
6782 
6783     /**
6784      * Processes hierarchy bounds events occurring on this component by
6785      * dispatching them to any registered
6786      * <code>HierarchyBoundsListener</code> objects.
6787      * <p>
6788      * This method is not called unless hierarchy bounds events
6789      * are enabled for this component. Hierarchy bounds events are enabled
6790      * when one of the following occurs:
6791      * <ul>
6792      * <li>An <code>HierarchyBoundsListener</code> object is registered
6793      * via <code>addHierarchyBoundsListener</code>.
6794      * <li>Hierarchy bounds events are enabled via <code>enableEvents</code>.
6795      * </ul>
6796      * <p>Note that if the event parameter is <code>null</code>
6797      * the behavior is unspecified and may result in an
6798      * exception.
6799      *
6800      * @param       e the hierarchy event
6801      * @see         java.awt.event.HierarchyEvent
6802      * @see         java.awt.event.HierarchyBoundsListener
6803      * @see         #addHierarchyBoundsListener
6804      * @see         #enableEvents
6805      * @since       1.3
6806      */
6807     protected void processHierarchyBoundsEvent(HierarchyEvent e) {
6808         HierarchyBoundsListener listener = hierarchyBoundsListener;
6809         if (listener != null) {
6810             int id = e.getID();
6811             switch (id) {
6812               case HierarchyEvent.ANCESTOR_MOVED:
6813                   listener.ancestorMoved(e);
6814                   break;
6815               case HierarchyEvent.ANCESTOR_RESIZED:
6816                   listener.ancestorResized(e);
6817                   break;
6818             }
6819         }
6820     }
6821 
6822     /**
6823      * @param  evt the event to handle
6824      * @return {@code true} if the event was handled, {@code false} otherwise
6825      * @deprecated As of JDK version 1.1
6826      * replaced by processEvent(AWTEvent).
6827      */
6828     @Deprecated
6829     public boolean handleEvent(Event evt) {
6830         switch (evt.id) {
6831           case Event.MOUSE_ENTER:
6832               return mouseEnter(evt, evt.x, evt.y);
6833 
6834           case Event.MOUSE_EXIT:
6835               return mouseExit(evt, evt.x, evt.y);
6836 
6837           case Event.MOUSE_MOVE:
6838               return mouseMove(evt, evt.x, evt.y);
6839 
6840           case Event.MOUSE_DOWN:
6841               return mouseDown(evt, evt.x, evt.y);
6842 
6843           case Event.MOUSE_DRAG:
6844               return mouseDrag(evt, evt.x, evt.y);
6845 
6846           case Event.MOUSE_UP:
6847               return mouseUp(evt, evt.x, evt.y);
6848 
6849           case Event.KEY_PRESS:
6850           case Event.KEY_ACTION:
6851               return keyDown(evt, evt.key);
6852 
6853           case Event.KEY_RELEASE:
6854           case Event.KEY_ACTION_RELEASE:
6855               return keyUp(evt, evt.key);
6856 
6857           case Event.ACTION_EVENT:
6858               return action(evt, evt.arg);
6859           case Event.GOT_FOCUS:
6860               return gotFocus(evt, evt.arg);
6861           case Event.LOST_FOCUS:
6862               return lostFocus(evt, evt.arg);
6863         }
6864         return false;
6865     }
6866 
6867     /**
6868      * @param  evt the event to handle
6869      * @param  x the x coordinate
6870      * @param  y the y coordinate
6871      * @return {@code false}
6872      * @deprecated As of JDK version 1.1,
6873      * replaced by processMouseEvent(MouseEvent).
6874      */
6875     @Deprecated
6876     public boolean mouseDown(Event evt, int x, int y) {
6877         return false;
6878     }
6879 
6880     /**
6881      * @param  evt the event to handle
6882      * @param  x the x coordinate
6883      * @param  y the y coordinate
6884      * @return {@code false}
6885      * @deprecated As of JDK version 1.1,
6886      * replaced by processMouseMotionEvent(MouseEvent).
6887      */
6888     @Deprecated
6889     public boolean mouseDrag(Event evt, int x, int y) {
6890         return false;
6891     }
6892 
6893     /**
6894      * @param  evt the event to handle
6895      * @param  x the x coordinate
6896      * @param  y the y coordinate
6897      * @return {@code false}
6898      * @deprecated As of JDK version 1.1,
6899      * replaced by processMouseEvent(MouseEvent).
6900      */
6901     @Deprecated
6902     public boolean mouseUp(Event evt, int x, int y) {
6903         return false;
6904     }
6905 
6906     /**
6907      * @param  evt the event to handle
6908      * @param  x the x coordinate
6909      * @param  y the y coordinate
6910      * @return {@code false}
6911      * @deprecated As of JDK version 1.1,
6912      * replaced by processMouseMotionEvent(MouseEvent).
6913      */
6914     @Deprecated
6915     public boolean mouseMove(Event evt, int x, int y) {
6916         return false;
6917     }
6918 
6919     /**
6920      * @param  evt the event to handle
6921      * @param  x the x coordinate
6922      * @param  y the y coordinate
6923      * @return {@code false}
6924      * @deprecated As of JDK version 1.1,
6925      * replaced by processMouseEvent(MouseEvent).
6926      */
6927     @Deprecated
6928     public boolean mouseEnter(Event evt, int x, int y) {
6929         return false;
6930     }
6931 
6932     /**
6933      * @param  evt the event to handle
6934      * @param  x the x coordinate
6935      * @param  y the y coordinate
6936      * @return {@code false}
6937      * @deprecated As of JDK version 1.1,
6938      * replaced by processMouseEvent(MouseEvent).
6939      */
6940     @Deprecated
6941     public boolean mouseExit(Event evt, int x, int y) {
6942         return false;
6943     }
6944 
6945     /**
6946      * @param  evt the event to handle
6947      * @param  key the key pressed
6948      * @return {@code false}
6949      * @deprecated As of JDK version 1.1,
6950      * replaced by processKeyEvent(KeyEvent).
6951      */
6952     @Deprecated
6953     public boolean keyDown(Event evt, int key) {
6954         return false;
6955     }
6956 
6957     /**
6958      * @param  evt the event to handle
6959      * @param  key the key pressed
6960      * @return {@code false}
6961      * @deprecated As of JDK version 1.1,
6962      * replaced by processKeyEvent(KeyEvent).
6963      */
6964     @Deprecated
6965     public boolean keyUp(Event evt, int key) {
6966         return false;
6967     }
6968 
6969     /**
6970      * @param  evt the event to handle
6971      * @param  what the object acted on
6972      * @return {@code false}
6973      * @deprecated As of JDK version 1.1,
6974      * should register this component as ActionListener on component
6975      * which fires action events.
6976      */
6977     @Deprecated
6978     public boolean action(Event evt, Object what) {
6979         return false;
6980     }
6981 
6982     /**
6983      * Makes this <code>Component</code> displayable by connecting it to a
6984      * native screen resource.
6985      * This method is called internally by the toolkit and should
6986      * not be called directly by programs.
6987      * <p>
6988      * This method changes layout-related information, and therefore,
6989      * invalidates the component hierarchy.
6990      *
6991      * @see       #isDisplayable
6992      * @see       #removeNotify
6993      * @see #invalidate
6994      * @since 1.0
6995      */
6996     public void addNotify() {
6997         synchronized (getTreeLock()) {
6998             ComponentPeer peer = this.peer;
6999             if (peer == null || peer instanceof LightweightPeer){
7000                 if (peer == null) {
7001                     // Update both the Component's peer variable and the local
7002                     // variable we use for thread safety.
7003                     this.peer = peer = getComponentFactory().createComponent(this);
7004                 }
7005 
7006                 // This is a lightweight component which means it won't be
7007                 // able to get window-related events by itself.  If any
7008                 // have been enabled, then the nearest native container must
7009                 // be enabled.
7010                 if (parent != null) {
7011                     long mask = 0;
7012                     if ((mouseListener != null) || ((eventMask & AWTEvent.MOUSE_EVENT_MASK) != 0)) {
7013                         mask |= AWTEvent.MOUSE_EVENT_MASK;
7014                     }
7015                     if ((mouseMotionListener != null) ||
7016                         ((eventMask & AWTEvent.MOUSE_MOTION_EVENT_MASK) != 0)) {
7017                         mask |= AWTEvent.MOUSE_MOTION_EVENT_MASK;
7018                     }
7019                     if ((mouseWheelListener != null ) ||
7020                         ((eventMask & AWTEvent.MOUSE_WHEEL_EVENT_MASK) != 0)) {
7021                         mask |= AWTEvent.MOUSE_WHEEL_EVENT_MASK;
7022                     }
7023                     if (focusListener != null || (eventMask & AWTEvent.FOCUS_EVENT_MASK) != 0) {
7024                         mask |= AWTEvent.FOCUS_EVENT_MASK;
7025                     }
7026                     if (keyListener != null || (eventMask & AWTEvent.KEY_EVENT_MASK) != 0) {
7027                         mask |= AWTEvent.KEY_EVENT_MASK;
7028                     }
7029                     if (mask != 0) {
7030                         parent.proxyEnableEvents(mask);
7031                     }
7032                 }
7033             } else {
7034                 // It's native. If the parent is lightweight it will need some
7035                 // help.
7036                 Container parent = getContainer();
7037                 if (parent != null && parent.isLightweight()) {
7038                     relocateComponent();
7039                     if (!parent.isRecursivelyVisibleUpToHeavyweightContainer())
7040                     {
7041                         peer.setVisible(false);
7042                     }
7043                 }
7044             }
7045             invalidate();
7046 
7047             int npopups = (popups != null? popups.size() : 0);
7048             for (int i = 0 ; i < npopups ; i++) {
7049                 PopupMenu popup = popups.elementAt(i);
7050                 popup.addNotify();
7051             }
7052 
7053             if (dropTarget != null) dropTarget.addNotify();
7054 
7055             peerFont = getFont();
7056 
7057             if (getContainer() != null && !isAddNotifyComplete) {
7058                 getContainer().increaseComponentCount(this);
7059             }
7060 
7061 
7062             // Update stacking order
7063             updateZOrder();
7064 
7065             if (!isAddNotifyComplete) {
7066                 mixOnShowing();
7067             }
7068 
7069             isAddNotifyComplete = true;
7070 
7071             if (hierarchyListener != null ||
7072                 (eventMask & AWTEvent.HIERARCHY_EVENT_MASK) != 0 ||
7073                 Toolkit.enabledOnToolkit(AWTEvent.HIERARCHY_EVENT_MASK)) {
7074                 HierarchyEvent e =
7075                     new HierarchyEvent(this, HierarchyEvent.HIERARCHY_CHANGED,
7076                                        this, parent,
7077                                        HierarchyEvent.DISPLAYABILITY_CHANGED |
7078                                        ((isRecursivelyVisible())
7079                                         ? HierarchyEvent.SHOWING_CHANGED
7080                                         : 0));
7081                 dispatchEvent(e);
7082             }
7083         }
7084     }
7085 
7086     /**
7087      * Makes this <code>Component</code> undisplayable by destroying it native
7088      * screen resource.
7089      * <p>
7090      * This method is called by the toolkit internally and should
7091      * not be called directly by programs. Code overriding
7092      * this method should call <code>super.removeNotify</code> as
7093      * the first line of the overriding method.
7094      *
7095      * @see       #isDisplayable
7096      * @see       #addNotify
7097      * @since 1.0
7098      */
7099     public void removeNotify() {
7100         KeyboardFocusManager.clearMostRecentFocusOwner(this);
7101         if (KeyboardFocusManager.getCurrentKeyboardFocusManager().
7102             getPermanentFocusOwner() == this)
7103         {
7104             KeyboardFocusManager.getCurrentKeyboardFocusManager().
7105                 setGlobalPermanentFocusOwner(null);
7106         }
7107 
7108         synchronized (getTreeLock()) {
7109             if (isFocusOwner() && KeyboardFocusManager.isAutoFocusTransferEnabledFor(this)) {
7110                 transferFocus(true);
7111             }
7112 
7113             if (getContainer() != null && isAddNotifyComplete) {
7114                 getContainer().decreaseComponentCount(this);
7115             }
7116 
7117             int npopups = (popups != null? popups.size() : 0);
7118             for (int i = 0 ; i < npopups ; i++) {
7119                 PopupMenu popup = popups.elementAt(i);
7120                 popup.removeNotify();
7121             }
7122             // If there is any input context for this component, notify
7123             // that this component is being removed. (This has to be done
7124             // before hiding peer.)
7125             if ((eventMask & AWTEvent.INPUT_METHODS_ENABLED_MASK) != 0) {
7126                 InputContext inputContext = getInputContext();
7127                 if (inputContext != null) {
7128                     inputContext.removeNotify(this);
7129                 }
7130             }
7131 
7132             ComponentPeer p = peer;
7133             if (p != null) {
7134                 boolean isLightweight = isLightweight();
7135 
7136                 if (bufferStrategy instanceof FlipBufferStrategy) {
7137                     ((FlipBufferStrategy)bufferStrategy).destroyBuffers();
7138                 }
7139 
7140                 if (dropTarget != null) dropTarget.removeNotify();
7141 
7142                 // Hide peer first to stop system events such as cursor moves.
7143                 if (visible) {
7144                     p.setVisible(false);
7145                 }
7146 
7147                 peer = null; // Stop peer updates.
7148                 peerFont = null;
7149 
7150                 Toolkit.getEventQueue().removeSourceEvents(this, false);
7151                 KeyboardFocusManager.getCurrentKeyboardFocusManager().
7152                     discardKeyEvents(this);
7153 
7154                 p.dispose();
7155 
7156                 mixOnHiding(isLightweight);
7157 
7158                 isAddNotifyComplete = false;
7159                 // Nullifying compoundShape means that the component has normal shape
7160                 // (or has no shape at all).
7161                 this.compoundShape = null;
7162             }
7163 
7164             if (hierarchyListener != null ||
7165                 (eventMask & AWTEvent.HIERARCHY_EVENT_MASK) != 0 ||
7166                 Toolkit.enabledOnToolkit(AWTEvent.HIERARCHY_EVENT_MASK)) {
7167                 HierarchyEvent e =
7168                     new HierarchyEvent(this, HierarchyEvent.HIERARCHY_CHANGED,
7169                                        this, parent,
7170                                        HierarchyEvent.DISPLAYABILITY_CHANGED |
7171                                        ((isRecursivelyVisible())
7172                                         ? HierarchyEvent.SHOWING_CHANGED
7173                                         : 0));
7174                 dispatchEvent(e);
7175             }
7176         }
7177     }
7178 
7179     /**
7180      * @param  evt the event to handle
7181      * @param  what the object focused
7182      * @return  {@code false}
7183      * @deprecated As of JDK version 1.1,
7184      * replaced by processFocusEvent(FocusEvent).
7185      */
7186     @Deprecated
7187     public boolean gotFocus(Event evt, Object what) {
7188         return false;
7189     }
7190 
7191     /**
7192      * @param evt  the event to handle
7193      * @param what the object focused
7194      * @return  {@code false}
7195      * @deprecated As of JDK version 1.1,
7196      * replaced by processFocusEvent(FocusEvent).
7197      */
7198     @Deprecated
7199     public boolean lostFocus(Event evt, Object what) {
7200         return false;
7201     }
7202 
7203     /**
7204      * Returns whether this <code>Component</code> can become the focus
7205      * owner.
7206      *
7207      * @return <code>true</code> if this <code>Component</code> is
7208      * focusable; <code>false</code> otherwise
7209      * @see #setFocusable
7210      * @since 1.1
7211      * @deprecated As of 1.4, replaced by <code>isFocusable()</code>.
7212      */
7213     @Deprecated
7214     public boolean isFocusTraversable() {
7215         if (isFocusTraversableOverridden == FOCUS_TRAVERSABLE_UNKNOWN) {
7216             isFocusTraversableOverridden = FOCUS_TRAVERSABLE_DEFAULT;
7217         }
7218         return focusable;
7219     }
7220 
7221     /**
7222      * Returns whether this Component can be focused.
7223      *
7224      * @return <code>true</code> if this Component is focusable;
7225      *         <code>false</code> otherwise.
7226      * @see #setFocusable
7227      * @since 1.4
7228      */
7229     public boolean isFocusable() {
7230         return isFocusTraversable();
7231     }
7232 
7233     /**
7234      * Sets the focusable state of this Component to the specified value. This
7235      * value overrides the Component's default focusability.
7236      *
7237      * @param focusable indicates whether this Component is focusable
7238      * @see #isFocusable
7239      * @since 1.4
7240      * @beaninfo
7241      *       bound: true
7242      */
7243     public void setFocusable(boolean focusable) {
7244         boolean oldFocusable;
7245         synchronized (this) {
7246             oldFocusable = this.focusable;
7247             this.focusable = focusable;
7248         }
7249         isFocusTraversableOverridden = FOCUS_TRAVERSABLE_SET;
7250 
7251         firePropertyChange("focusable", oldFocusable, focusable);
7252         if (oldFocusable && !focusable) {
7253             if (isFocusOwner() && KeyboardFocusManager.isAutoFocusTransferEnabled()) {
7254                 transferFocus(true);
7255             }
7256             KeyboardFocusManager.clearMostRecentFocusOwner(this);
7257         }
7258     }
7259 
7260     final boolean isFocusTraversableOverridden() {
7261         return (isFocusTraversableOverridden != FOCUS_TRAVERSABLE_DEFAULT);
7262     }
7263 
7264     /**
7265      * Sets the focus traversal keys for a given traversal operation for this
7266      * Component.
7267      * <p>
7268      * The default values for a Component's focus traversal keys are
7269      * implementation-dependent. Sun recommends that all implementations for a
7270      * particular native platform use the same default values. The
7271      * recommendations for Windows and Unix are listed below. These
7272      * recommendations are used in the Sun AWT implementations.
7273      *
7274      * <table border=1 summary="Recommended default values for a Component's focus traversal keys">
7275      * <tr>
7276      *    <th>Identifier</th>
7277      *    <th>Meaning</th>
7278      *    <th>Default</th>
7279      * </tr>
7280      * <tr>
7281      *    <td>KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS</td>
7282      *    <td>Normal forward keyboard traversal</td>
7283      *    <td>TAB on KEY_PRESSED, CTRL-TAB on KEY_PRESSED</td>
7284      * </tr>
7285      * <tr>
7286      *    <td>KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS</td>
7287      *    <td>Normal reverse keyboard traversal</td>
7288      *    <td>SHIFT-TAB on KEY_PRESSED, CTRL-SHIFT-TAB on KEY_PRESSED</td>
7289      * </tr>
7290      * <tr>
7291      *    <td>KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS</td>
7292      *    <td>Go up one focus traversal cycle</td>
7293      *    <td>none</td>
7294      * </tr>
7295      * </table>
7296      *
7297      * To disable a traversal key, use an empty Set; Collections.EMPTY_SET is
7298      * recommended.
7299      * <p>
7300      * Using the AWTKeyStroke API, client code can specify on which of two
7301      * specific KeyEvents, KEY_PRESSED or KEY_RELEASED, the focus traversal
7302      * operation will occur. Regardless of which KeyEvent is specified,
7303      * however, all KeyEvents related to the focus traversal key, including the
7304      * associated KEY_TYPED event, will be consumed, and will not be dispatched
7305      * to any Component. It is a runtime error to specify a KEY_TYPED event as
7306      * mapping to a focus traversal operation, or to map the same event to
7307      * multiple default focus traversal operations.
7308      * <p>
7309      * If a value of null is specified for the Set, this Component inherits the
7310      * Set from its parent. If all ancestors of this Component have null
7311      * specified for the Set, then the current KeyboardFocusManager's default
7312      * Set is used.
7313      * <p>
7314      * This method may throw a {@code ClassCastException} if any {@code Object}
7315      * in {@code keystrokes} is not an {@code AWTKeyStroke}.
7316      *
7317      * @param id one of KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS,
7318      *        KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS, or
7319      *        KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS
7320      * @param keystrokes the Set of AWTKeyStroke for the specified operation
7321      * @see #getFocusTraversalKeys
7322      * @see KeyboardFocusManager#FORWARD_TRAVERSAL_KEYS
7323      * @see KeyboardFocusManager#BACKWARD_TRAVERSAL_KEYS
7324      * @see KeyboardFocusManager#UP_CYCLE_TRAVERSAL_KEYS
7325      * @throws IllegalArgumentException if id is not one of
7326      *         KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS,
7327      *         KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS, or
7328      *         KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS, or if keystrokes
7329      *         contains null, or if any keystroke represents a KEY_TYPED event,
7330      *         or if any keystroke already maps to another focus traversal
7331      *         operation for this Component
7332      * @since 1.4
7333      * @beaninfo
7334      *       bound: true
7335      */
7336     public void setFocusTraversalKeys(int id,
7337                                       Set<? extends AWTKeyStroke> keystrokes)
7338     {
7339         if (id < 0 || id >= KeyboardFocusManager.TRAVERSAL_KEY_LENGTH - 1) {
7340             throw new IllegalArgumentException("invalid focus traversal key identifier");
7341         }
7342 
7343         setFocusTraversalKeys_NoIDCheck(id, keystrokes);
7344     }
7345 
7346     /**
7347      * Returns the Set of focus traversal keys for a given traversal operation
7348      * for this Component. (See
7349      * <code>setFocusTraversalKeys</code> for a full description of each key.)
7350      * <p>
7351      * If a Set of traversal keys has not been explicitly defined for this
7352      * Component, then this Component's parent's Set is returned. If no Set
7353      * has been explicitly defined for any of this Component's ancestors, then
7354      * the current KeyboardFocusManager's default Set is returned.
7355      *
7356      * @param id one of KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS,
7357      *        KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS, or
7358      *        KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS
7359      * @return the Set of AWTKeyStrokes for the specified operation. The Set
7360      *         will be unmodifiable, and may be empty. null will never be
7361      *         returned.
7362      * @see #setFocusTraversalKeys
7363      * @see KeyboardFocusManager#FORWARD_TRAVERSAL_KEYS
7364      * @see KeyboardFocusManager#BACKWARD_TRAVERSAL_KEYS
7365      * @see KeyboardFocusManager#UP_CYCLE_TRAVERSAL_KEYS
7366      * @throws IllegalArgumentException if id is not one of
7367      *         KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS,
7368      *         KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS, or
7369      *         KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS
7370      * @since 1.4
7371      */
7372     public Set<AWTKeyStroke> getFocusTraversalKeys(int id) {
7373         if (id < 0 || id >= KeyboardFocusManager.TRAVERSAL_KEY_LENGTH - 1) {
7374             throw new IllegalArgumentException("invalid focus traversal key identifier");
7375         }
7376 
7377         return getFocusTraversalKeys_NoIDCheck(id);
7378     }
7379 
7380     // We define these methods so that Container does not need to repeat this
7381     // code. Container cannot call super.<method> because Container allows
7382     // DOWN_CYCLE_TRAVERSAL_KEY while Component does not. The Component method
7383     // would erroneously generate an IllegalArgumentException for
7384     // DOWN_CYCLE_TRAVERSAL_KEY.
7385     final void setFocusTraversalKeys_NoIDCheck(int id, Set<? extends AWTKeyStroke> keystrokes) {
7386         Set<AWTKeyStroke> oldKeys;
7387 
7388         synchronized (this) {
7389             if (focusTraversalKeys == null) {
7390                 initializeFocusTraversalKeys();
7391             }
7392 
7393             if (keystrokes != null) {
7394                 for (AWTKeyStroke keystroke : keystrokes ) {
7395 
7396                     if (keystroke == null) {
7397                         throw new IllegalArgumentException("cannot set null focus traversal key");
7398                     }
7399 
7400                     if (keystroke.getKeyChar() != KeyEvent.CHAR_UNDEFINED) {
7401                         throw new IllegalArgumentException("focus traversal keys cannot map to KEY_TYPED events");
7402                     }
7403 
7404                     for (int i = 0; i < focusTraversalKeys.length; i++) {
7405                         if (i == id) {
7406                             continue;
7407                         }
7408 
7409                         if (getFocusTraversalKeys_NoIDCheck(i).contains(keystroke))
7410                         {
7411                             throw new IllegalArgumentException("focus traversal keys must be unique for a Component");
7412                         }
7413                     }
7414                 }
7415             }
7416 
7417             oldKeys = focusTraversalKeys[id];
7418             focusTraversalKeys[id] = (keystrokes != null)
7419                 ? Collections.unmodifiableSet(new HashSet<AWTKeyStroke>(keystrokes))
7420                 : null;
7421         }
7422 
7423         firePropertyChange(focusTraversalKeyPropertyNames[id], oldKeys,
7424                            keystrokes);
7425     }
7426     final Set<AWTKeyStroke> getFocusTraversalKeys_NoIDCheck(int id) {
7427         // Okay to return Set directly because it is an unmodifiable view
7428         @SuppressWarnings("unchecked")
7429         Set<AWTKeyStroke> keystrokes = (focusTraversalKeys != null)
7430             ? focusTraversalKeys[id]
7431             : null;
7432 
7433         if (keystrokes != null) {
7434             return keystrokes;
7435         } else {
7436             Container parent = this.parent;
7437             if (parent != null) {
7438                 return parent.getFocusTraversalKeys(id);
7439             } else {
7440                 return KeyboardFocusManager.getCurrentKeyboardFocusManager().
7441                     getDefaultFocusTraversalKeys(id);
7442             }
7443         }
7444     }
7445 
7446     /**
7447      * Returns whether the Set of focus traversal keys for the given focus
7448      * traversal operation has been explicitly defined for this Component. If
7449      * this method returns <code>false</code>, this Component is inheriting the
7450      * Set from an ancestor, or from the current KeyboardFocusManager.
7451      *
7452      * @param id one of KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS,
7453      *        KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS, or
7454      *        KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS
7455      * @return <code>true</code> if the Set of focus traversal keys for the
7456      *         given focus traversal operation has been explicitly defined for
7457      *         this Component; <code>false</code> otherwise.
7458      * @throws IllegalArgumentException if id is not one of
7459      *         KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS,
7460      *         KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS, or
7461      *         KeyboardFocusManager.UP_CYCLE_TRAVERSAL_KEYS
7462      * @since 1.4
7463      */
7464     public boolean areFocusTraversalKeysSet(int id) {
7465         if (id < 0 || id >= KeyboardFocusManager.TRAVERSAL_KEY_LENGTH - 1) {
7466             throw new IllegalArgumentException("invalid focus traversal key identifier");
7467         }
7468 
7469         return (focusTraversalKeys != null && focusTraversalKeys[id] != null);
7470     }
7471 
7472     /**
7473      * Sets whether focus traversal keys are enabled for this Component.
7474      * Components for which focus traversal keys are disabled receive key
7475      * events for focus traversal keys. Components for which focus traversal
7476      * keys are enabled do not see these events; instead, the events are
7477      * automatically converted to traversal operations.
7478      *
7479      * @param focusTraversalKeysEnabled whether focus traversal keys are
7480      *        enabled for this Component
7481      * @see #getFocusTraversalKeysEnabled
7482      * @see #setFocusTraversalKeys
7483      * @see #getFocusTraversalKeys
7484      * @since 1.4
7485      * @beaninfo
7486      *       bound: true
7487      */
7488     public void setFocusTraversalKeysEnabled(boolean
7489                                              focusTraversalKeysEnabled) {
7490         boolean oldFocusTraversalKeysEnabled;
7491         synchronized (this) {
7492             oldFocusTraversalKeysEnabled = this.focusTraversalKeysEnabled;
7493             this.focusTraversalKeysEnabled = focusTraversalKeysEnabled;
7494         }
7495         firePropertyChange("focusTraversalKeysEnabled",
7496                            oldFocusTraversalKeysEnabled,
7497                            focusTraversalKeysEnabled);
7498     }
7499 
7500     /**
7501      * Returns whether focus traversal keys are enabled for this Component.
7502      * Components for which focus traversal keys are disabled receive key
7503      * events for focus traversal keys. Components for which focus traversal
7504      * keys are enabled do not see these events; instead, the events are
7505      * automatically converted to traversal operations.
7506      *
7507      * @return whether focus traversal keys are enabled for this Component
7508      * @see #setFocusTraversalKeysEnabled
7509      * @see #setFocusTraversalKeys
7510      * @see #getFocusTraversalKeys
7511      * @since 1.4
7512      */
7513     public boolean getFocusTraversalKeysEnabled() {
7514         return focusTraversalKeysEnabled;
7515     }
7516 
7517     /**
7518      * Requests that this Component get the input focus, and that this
7519      * Component's top-level ancestor become the focused Window. This
7520      * component must be displayable, focusable, visible and all of
7521      * its ancestors (with the exception of the top-level Window) must
7522      * be visible for the request to be granted. Every effort will be
7523      * made to honor the request; however, in some cases it may be
7524      * impossible to do so. Developers must never assume that this
7525      * Component is the focus owner until this Component receives a
7526      * FOCUS_GAINED event. If this request is denied because this
7527      * Component's top-level Window cannot become the focused Window,
7528      * the request will be remembered and will be granted when the
7529      * Window is later focused by the user.
7530      * <p>
7531      * This method cannot be used to set the focus owner to no Component at
7532      * all. Use <code>KeyboardFocusManager.clearGlobalFocusOwner()</code>
7533      * instead.
7534      * <p>
7535      * Because the focus behavior of this method is platform-dependent,
7536      * developers are strongly encouraged to use
7537      * <code>requestFocusInWindow</code> when possible.
7538      *
7539      * <p>Note: Not all focus transfers result from invoking this method. As
7540      * such, a component may receive focus without this or any of the other
7541      * {@code requestFocus} methods of {@code Component} being invoked.
7542      *
7543      * @see #requestFocusInWindow
7544      * @see java.awt.event.FocusEvent
7545      * @see #addFocusListener
7546      * @see #isFocusable
7547      * @see #isDisplayable
7548      * @see KeyboardFocusManager#clearGlobalFocusOwner
7549      * @since 1.0
7550      */
7551     public void requestFocus() {
7552         requestFocusHelper(false, true);
7553     }
7554 
7555     boolean requestFocus(CausedFocusEvent.Cause cause) {
7556         return requestFocusHelper(false, true, cause);
7557     }
7558 
7559     /**
7560      * Requests that this <code>Component</code> get the input focus,
7561      * and that this <code>Component</code>'s top-level ancestor
7562      * become the focused <code>Window</code>. This component must be
7563      * displayable, focusable, visible and all of its ancestors (with
7564      * the exception of the top-level Window) must be visible for the
7565      * request to be granted. Every effort will be made to honor the
7566      * request; however, in some cases it may be impossible to do
7567      * so. Developers must never assume that this component is the
7568      * focus owner until this component receives a FOCUS_GAINED
7569      * event. If this request is denied because this component's
7570      * top-level window cannot become the focused window, the request
7571      * will be remembered and will be granted when the window is later
7572      * focused by the user.
7573      * <p>
7574      * This method returns a boolean value. If <code>false</code> is returned,
7575      * the request is <b>guaranteed to fail</b>. If <code>true</code> is
7576      * returned, the request will succeed <b>unless</b> it is vetoed, or an
7577      * extraordinary event, such as disposal of the component's peer, occurs
7578      * before the request can be granted by the native windowing system. Again,
7579      * while a return value of <code>true</code> indicates that the request is
7580      * likely to succeed, developers must never assume that this component is
7581      * the focus owner until this component receives a FOCUS_GAINED event.
7582      * <p>
7583      * This method cannot be used to set the focus owner to no component at
7584      * all. Use <code>KeyboardFocusManager.clearGlobalFocusOwner</code>
7585      * instead.
7586      * <p>
7587      * Because the focus behavior of this method is platform-dependent,
7588      * developers are strongly encouraged to use
7589      * <code>requestFocusInWindow</code> when possible.
7590      * <p>
7591      * Every effort will be made to ensure that <code>FocusEvent</code>s
7592      * generated as a
7593      * result of this request will have the specified temporary value. However,
7594      * because specifying an arbitrary temporary state may not be implementable
7595      * on all native windowing systems, correct behavior for this method can be
7596      * guaranteed only for lightweight <code>Component</code>s.
7597      * This method is not intended
7598      * for general use, but exists instead as a hook for lightweight component
7599      * libraries, such as Swing.
7600      *
7601      * <p>Note: Not all focus transfers result from invoking this method. As
7602      * such, a component may receive focus without this or any of the other
7603      * {@code requestFocus} methods of {@code Component} being invoked.
7604      *
7605      * @param temporary true if the focus change is temporary,
7606      *        such as when the window loses the focus; for
7607      *        more information on temporary focus changes see the
7608      *<a href="../../java/awt/doc-files/FocusSpec.html">Focus Specification</a>
7609      * @return <code>false</code> if the focus change request is guaranteed to
7610      *         fail; <code>true</code> if it is likely to succeed
7611      * @see java.awt.event.FocusEvent
7612      * @see #addFocusListener
7613      * @see #isFocusable
7614      * @see #isDisplayable
7615      * @see KeyboardFocusManager#clearGlobalFocusOwner
7616      * @since 1.4
7617      */
7618     protected boolean requestFocus(boolean temporary) {
7619         return requestFocusHelper(temporary, true);
7620     }
7621 
7622     boolean requestFocus(boolean temporary, CausedFocusEvent.Cause cause) {
7623         return requestFocusHelper(temporary, true, cause);
7624     }
7625     /**
7626      * Requests that this Component get the input focus, if this
7627      * Component's top-level ancestor is already the focused
7628      * Window. This component must be displayable, focusable, visible
7629      * and all of its ancestors (with the exception of the top-level
7630      * Window) must be visible for the request to be granted. Every
7631      * effort will be made to honor the request; however, in some
7632      * cases it may be impossible to do so. Developers must never
7633      * assume that this Component is the focus owner until this
7634      * Component receives a FOCUS_GAINED event.
7635      * <p>
7636      * This method returns a boolean value. If <code>false</code> is returned,
7637      * the request is <b>guaranteed to fail</b>. If <code>true</code> is
7638      * returned, the request will succeed <b>unless</b> it is vetoed, or an
7639      * extraordinary event, such as disposal of the Component's peer, occurs
7640      * before the request can be granted by the native windowing system. Again,
7641      * while a return value of <code>true</code> indicates that the request is
7642      * likely to succeed, developers must never assume that this Component is
7643      * the focus owner until this Component receives a FOCUS_GAINED event.
7644      * <p>
7645      * This method cannot be used to set the focus owner to no Component at
7646      * all. Use <code>KeyboardFocusManager.clearGlobalFocusOwner()</code>
7647      * instead.
7648      * <p>
7649      * The focus behavior of this method can be implemented uniformly across
7650      * platforms, and thus developers are strongly encouraged to use this
7651      * method over <code>requestFocus</code> when possible. Code which relies
7652      * on <code>requestFocus</code> may exhibit different focus behavior on
7653      * different platforms.
7654      *
7655      * <p>Note: Not all focus transfers result from invoking this method. As
7656      * such, a component may receive focus without this or any of the other
7657      * {@code requestFocus} methods of {@code Component} being invoked.
7658      *
7659      * @return <code>false</code> if the focus change request is guaranteed to
7660      *         fail; <code>true</code> if it is likely to succeed
7661      * @see #requestFocus
7662      * @see java.awt.event.FocusEvent
7663      * @see #addFocusListener
7664      * @see #isFocusable
7665      * @see #isDisplayable
7666      * @see KeyboardFocusManager#clearGlobalFocusOwner
7667      * @since 1.4
7668      */
7669     public boolean requestFocusInWindow() {
7670         return requestFocusHelper(false, false);
7671     }
7672 
7673     boolean requestFocusInWindow(CausedFocusEvent.Cause cause) {
7674         return requestFocusHelper(false, false, cause);
7675     }
7676 
7677     /**
7678      * Requests that this <code>Component</code> get the input focus,
7679      * if this <code>Component</code>'s top-level ancestor is already
7680      * the focused <code>Window</code>.  This component must be
7681      * displayable, focusable, visible and all of its ancestors (with
7682      * the exception of the top-level Window) must be visible for the
7683      * request to be granted. Every effort will be made to honor the
7684      * request; however, in some cases it may be impossible to do
7685      * so. Developers must never assume that this component is the
7686      * focus owner until this component receives a FOCUS_GAINED event.
7687      * <p>
7688      * This method returns a boolean value. If <code>false</code> is returned,
7689      * the request is <b>guaranteed to fail</b>. If <code>true</code> is
7690      * returned, the request will succeed <b>unless</b> it is vetoed, or an
7691      * extraordinary event, such as disposal of the component's peer, occurs
7692      * before the request can be granted by the native windowing system. Again,
7693      * while a return value of <code>true</code> indicates that the request is
7694      * likely to succeed, developers must never assume that this component is
7695      * the focus owner until this component receives a FOCUS_GAINED event.
7696      * <p>
7697      * This method cannot be used to set the focus owner to no component at
7698      * all. Use <code>KeyboardFocusManager.clearGlobalFocusOwner</code>
7699      * instead.
7700      * <p>
7701      * The focus behavior of this method can be implemented uniformly across
7702      * platforms, and thus developers are strongly encouraged to use this
7703      * method over <code>requestFocus</code> when possible. Code which relies
7704      * on <code>requestFocus</code> may exhibit different focus behavior on
7705      * different platforms.
7706      * <p>
7707      * Every effort will be made to ensure that <code>FocusEvent</code>s
7708      * generated as a
7709      * result of this request will have the specified temporary value. However,
7710      * because specifying an arbitrary temporary state may not be implementable
7711      * on all native windowing systems, correct behavior for this method can be
7712      * guaranteed only for lightweight components. This method is not intended
7713      * for general use, but exists instead as a hook for lightweight component
7714      * libraries, such as Swing.
7715      *
7716      * <p>Note: Not all focus transfers result from invoking this method. As
7717      * such, a component may receive focus without this or any of the other
7718      * {@code requestFocus} methods of {@code Component} being invoked.
7719      *
7720      * @param temporary true if the focus change is temporary,
7721      *        such as when the window loses the focus; for
7722      *        more information on temporary focus changes see the
7723      *<a href="../../java/awt/doc-files/FocusSpec.html">Focus Specification</a>
7724      * @return <code>false</code> if the focus change request is guaranteed to
7725      *         fail; <code>true</code> if it is likely to succeed
7726      * @see #requestFocus
7727      * @see java.awt.event.FocusEvent
7728      * @see #addFocusListener
7729      * @see #isFocusable
7730      * @see #isDisplayable
7731      * @see KeyboardFocusManager#clearGlobalFocusOwner
7732      * @since 1.4
7733      */
7734     protected boolean requestFocusInWindow(boolean temporary) {
7735         return requestFocusHelper(temporary, false);
7736     }
7737 
7738     boolean requestFocusInWindow(boolean temporary, CausedFocusEvent.Cause cause) {
7739         return requestFocusHelper(temporary, false, cause);
7740     }
7741 
7742     final boolean requestFocusHelper(boolean temporary,
7743                                      boolean focusedWindowChangeAllowed) {
7744         return requestFocusHelper(temporary, focusedWindowChangeAllowed, CausedFocusEvent.Cause.UNKNOWN);
7745     }
7746 
7747     final boolean requestFocusHelper(boolean temporary,
7748                                      boolean focusedWindowChangeAllowed,
7749                                      CausedFocusEvent.Cause cause)
7750     {
7751         // 1) Check if the event being dispatched is a system-generated mouse event.
7752         AWTEvent currentEvent = EventQueue.getCurrentEvent();
7753         if (currentEvent instanceof MouseEvent &&
7754             SunToolkit.isSystemGenerated(currentEvent))
7755         {
7756             // 2) Sanity check: if the mouse event component source belongs to the same containing window.
7757             Component source = ((MouseEvent)currentEvent).getComponent();
7758             if (source == null || source.getContainingWindow() == getContainingWindow()) {
7759                 focusLog.finest("requesting focus by mouse event \"in window\"");
7760 
7761                 // If both the conditions are fulfilled the focus request should be strictly
7762                 // bounded by the toplevel window. It's assumed that the mouse event activates
7763                 // the window (if it wasn't active) and this makes it possible for a focus
7764                 // request with a strong in-window requirement to change focus in the bounds
7765                 // of the toplevel. If, by any means, due to asynchronous nature of the event
7766                 // dispatching mechanism, the window happens to be natively inactive by the time
7767                 // this focus request is eventually handled, it should not re-activate the
7768                 // toplevel. Otherwise the result may not meet user expectations. See 6981400.
7769                 focusedWindowChangeAllowed = false;
7770             }
7771         }
7772         if (!isRequestFocusAccepted(temporary, focusedWindowChangeAllowed, cause)) {
7773             if (focusLog.isLoggable(PlatformLogger.Level.FINEST)) {
7774                 focusLog.finest("requestFocus is not accepted");
7775             }
7776             return false;
7777         }
7778         // Update most-recent map
7779         KeyboardFocusManager.setMostRecentFocusOwner(this);
7780 
7781         Component window = this;
7782         while ( (window != null) && !(window instanceof Window)) {
7783             if (!window.isVisible()) {
7784                 if (focusLog.isLoggable(PlatformLogger.Level.FINEST)) {
7785                     focusLog.finest("component is recursively invisible");
7786                 }
7787                 return false;
7788             }
7789             window = window.parent;
7790         }
7791 
7792         ComponentPeer peer = this.peer;
7793         Component heavyweight = (peer instanceof LightweightPeer)
7794             ? getNativeContainer() : this;
7795         if (heavyweight == null || !heavyweight.isVisible()) {
7796             if (focusLog.isLoggable(PlatformLogger.Level.FINEST)) {
7797                 focusLog.finest("Component is not a part of visible hierarchy");
7798             }
7799             return false;
7800         }
7801         peer = heavyweight.peer;
7802         if (peer == null) {
7803             if (focusLog.isLoggable(PlatformLogger.Level.FINEST)) {
7804                 focusLog.finest("Peer is null");
7805             }
7806             return false;
7807         }
7808 
7809         // Focus this Component
7810         long time = 0;
7811         if (EventQueue.isDispatchThread()) {
7812             time = Toolkit.getEventQueue().getMostRecentKeyEventTime();
7813         } else {
7814             // A focus request made from outside EDT should not be associated with any event
7815             // and so its time stamp is simply set to the current time.
7816             time = System.currentTimeMillis();
7817         }
7818 
7819         boolean success = peer.requestFocus
7820             (this, temporary, focusedWindowChangeAllowed, time, cause);
7821         if (!success) {
7822             KeyboardFocusManager.getCurrentKeyboardFocusManager
7823                 (appContext).dequeueKeyEvents(time, this);
7824             if (focusLog.isLoggable(PlatformLogger.Level.FINEST)) {
7825                 focusLog.finest("Peer request failed");
7826             }
7827         } else {
7828             if (focusLog.isLoggable(PlatformLogger.Level.FINEST)) {
7829                 focusLog.finest("Pass for " + this);
7830             }
7831         }
7832         return success;
7833     }
7834 
7835     private boolean isRequestFocusAccepted(boolean temporary,
7836                                            boolean focusedWindowChangeAllowed,
7837                                            CausedFocusEvent.Cause cause)
7838     {
7839         if (!isFocusable() || !isVisible()) {
7840             if (focusLog.isLoggable(PlatformLogger.Level.FINEST)) {
7841                 focusLog.finest("Not focusable or not visible");
7842             }
7843             return false;
7844         }
7845 
7846         ComponentPeer peer = this.peer;
7847         if (peer == null) {
7848             if (focusLog.isLoggable(PlatformLogger.Level.FINEST)) {
7849                 focusLog.finest("peer is null");
7850             }
7851             return false;
7852         }
7853 
7854         Window window = getContainingWindow();
7855         if (window == null || !window.isFocusableWindow()) {
7856             if (focusLog.isLoggable(PlatformLogger.Level.FINEST)) {
7857                 focusLog.finest("Component doesn't have toplevel");
7858             }
7859             return false;
7860         }
7861 
7862         // We have passed all regular checks for focus request,
7863         // now let's call RequestFocusController and see what it says.
7864         Component focusOwner = KeyboardFocusManager.getMostRecentFocusOwner(window);
7865         if (focusOwner == null) {
7866             // sometimes most recent focus owner may be null, but focus owner is not
7867             // e.g. we reset most recent focus owner if user removes focus owner
7868             focusOwner = KeyboardFocusManager.getCurrentKeyboardFocusManager().getFocusOwner();
7869             if (focusOwner != null && focusOwner.getContainingWindow() != window) {
7870                 focusOwner = null;
7871             }
7872         }
7873 
7874         if (focusOwner == this || focusOwner == null) {
7875             // Controller is supposed to verify focus transfers and for this it
7876             // should know both from and to components.  And it shouldn't verify
7877             // transfers from when these components are equal.
7878             if (focusLog.isLoggable(PlatformLogger.Level.FINEST)) {
7879                 focusLog.finest("focus owner is null or this");
7880             }
7881             return true;
7882         }
7883 
7884         if (CausedFocusEvent.Cause.ACTIVATION == cause) {
7885             // we shouldn't call RequestFocusController in case we are
7886             // in activation.  We do request focus on component which
7887             // has got temporary focus lost and then on component which is
7888             // most recent focus owner.  But most recent focus owner can be
7889             // changed by requestFocusXXX() call only, so this transfer has
7890             // been already approved.
7891             if (focusLog.isLoggable(PlatformLogger.Level.FINEST)) {
7892                 focusLog.finest("cause is activation");
7893             }
7894             return true;
7895         }
7896 
7897         boolean ret = Component.requestFocusController.acceptRequestFocus(focusOwner,
7898                                                                           this,
7899                                                                           temporary,
7900                                                                           focusedWindowChangeAllowed,
7901                                                                           cause);
7902         if (focusLog.isLoggable(PlatformLogger.Level.FINEST)) {
7903             focusLog.finest("RequestFocusController returns {0}", ret);
7904         }
7905 
7906         return ret;
7907     }
7908 
7909     private static RequestFocusController requestFocusController = new DummyRequestFocusController();
7910 
7911     // Swing access this method through reflection to implement InputVerifier's functionality.
7912     // Perhaps, we should make this method public (later ;)
7913     private static class DummyRequestFocusController implements RequestFocusController {
7914         public boolean acceptRequestFocus(Component from, Component to,
7915                                           boolean temporary, boolean focusedWindowChangeAllowed,
7916                                           CausedFocusEvent.Cause cause)
7917         {
7918             return true;
7919         }
7920     };
7921 
7922     static synchronized void setRequestFocusController(RequestFocusController requestController)
7923     {
7924         if (requestController == null) {
7925             requestFocusController = new DummyRequestFocusController();
7926         } else {
7927             requestFocusController = requestController;
7928         }
7929     }
7930 
7931     /**
7932      * Returns the Container which is the focus cycle root of this Component's
7933      * focus traversal cycle. Each focus traversal cycle has only a single
7934      * focus cycle root and each Component which is not a Container belongs to
7935      * only a single focus traversal cycle. Containers which are focus cycle
7936      * roots belong to two cycles: one rooted at the Container itself, and one
7937      * rooted at the Container's nearest focus-cycle-root ancestor. For such
7938      * Containers, this method will return the Container's nearest focus-cycle-
7939      * root ancestor.
7940      *
7941      * @return this Component's nearest focus-cycle-root ancestor
7942      * @see Container#isFocusCycleRoot()
7943      * @since 1.4
7944      */
7945     public Container getFocusCycleRootAncestor() {
7946         Container rootAncestor = this.parent;
7947         while (rootAncestor != null && !rootAncestor.isFocusCycleRoot()) {
7948             rootAncestor = rootAncestor.parent;
7949         }
7950         return rootAncestor;
7951     }
7952 
7953     /**
7954      * Returns whether the specified Container is the focus cycle root of this
7955      * Component's focus traversal cycle. Each focus traversal cycle has only
7956      * a single focus cycle root and each Component which is not a Container
7957      * belongs to only a single focus traversal cycle.
7958      *
7959      * @param container the Container to be tested
7960      * @return <code>true</code> if the specified Container is a focus-cycle-
7961      *         root of this Component; <code>false</code> otherwise
7962      * @see Container#isFocusCycleRoot()
7963      * @since 1.4
7964      */
7965     public boolean isFocusCycleRoot(Container container) {
7966         Container rootAncestor = getFocusCycleRootAncestor();
7967         return (rootAncestor == container);
7968     }
7969 
7970     Container getTraversalRoot() {
7971         return getFocusCycleRootAncestor();
7972     }
7973 
7974     /**
7975      * Transfers the focus to the next component, as though this Component were
7976      * the focus owner.
7977      * @see       #requestFocus()
7978      * @since     1.1
7979      */
7980     public void transferFocus() {
7981         nextFocus();
7982     }
7983 
7984     /**
7985      * @deprecated As of JDK version 1.1,
7986      * replaced by transferFocus().
7987      */
7988     @Deprecated
7989     public void nextFocus() {
7990         transferFocus(false);
7991     }
7992 
7993     boolean transferFocus(boolean clearOnFailure) {
7994         if (focusLog.isLoggable(PlatformLogger.Level.FINER)) {
7995             focusLog.finer("clearOnFailure = " + clearOnFailure);
7996         }
7997         Component toFocus = getNextFocusCandidate();
7998         boolean res = false;
7999         if (toFocus != null && !toFocus.isFocusOwner() && toFocus != this) {
8000             res = toFocus.requestFocusInWindow(CausedFocusEvent.Cause.TRAVERSAL_FORWARD);
8001         }
8002         if (clearOnFailure && !res) {
8003             if (focusLog.isLoggable(PlatformLogger.Level.FINER)) {
8004                 focusLog.finer("clear global focus owner");
8005             }
8006             KeyboardFocusManager.getCurrentKeyboardFocusManager().clearGlobalFocusOwnerPriv();
8007         }
8008         if (focusLog.isLoggable(PlatformLogger.Level.FINER)) {
8009             focusLog.finer("returning result: " + res);
8010         }
8011         return res;
8012     }
8013 
8014     final Component getNextFocusCandidate() {
8015         Container rootAncestor = getTraversalRoot();
8016         Component comp = this;
8017         while (rootAncestor != null &&
8018                !(rootAncestor.isShowing() && rootAncestor.canBeFocusOwner()))
8019         {
8020             comp = rootAncestor;
8021             rootAncestor = comp.getFocusCycleRootAncestor();
8022         }
8023         if (focusLog.isLoggable(PlatformLogger.Level.FINER)) {
8024             focusLog.finer("comp = " + comp + ", root = " + rootAncestor);
8025         }
8026         Component candidate = null;
8027         if (rootAncestor != null) {
8028             FocusTraversalPolicy policy = rootAncestor.getFocusTraversalPolicy();
8029             Component toFocus = policy.getComponentAfter(rootAncestor, comp);
8030             if (focusLog.isLoggable(PlatformLogger.Level.FINER)) {
8031                 focusLog.finer("component after is " + toFocus);
8032             }
8033             if (toFocus == null) {
8034                 toFocus = policy.getDefaultComponent(rootAncestor);
8035                 if (focusLog.isLoggable(PlatformLogger.Level.FINER)) {
8036                     focusLog.finer("default component is " + toFocus);
8037                 }
8038             }
8039             if (toFocus == null) {
8040                 Applet applet = EmbeddedFrame.getAppletIfAncestorOf(this);
8041                 if (applet != null) {
8042                     toFocus = applet;
8043                 }
8044             }
8045             candidate = toFocus;
8046         }
8047         if (focusLog.isLoggable(PlatformLogger.Level.FINER)) {
8048             focusLog.finer("Focus transfer candidate: " + candidate);
8049         }
8050         return candidate;
8051     }
8052 
8053     /**
8054      * Transfers the focus to the previous component, as though this Component
8055      * were the focus owner.
8056      * @see       #requestFocus()
8057      * @since     1.4
8058      */
8059     public void transferFocusBackward() {
8060         transferFocusBackward(false);
8061     }
8062 
8063     boolean transferFocusBackward(boolean clearOnFailure) {
8064         Container rootAncestor = getTraversalRoot();
8065         Component comp = this;
8066         while (rootAncestor != null &&
8067                !(rootAncestor.isShowing() && rootAncestor.canBeFocusOwner()))
8068         {
8069             comp = rootAncestor;
8070             rootAncestor = comp.getFocusCycleRootAncestor();
8071         }
8072         boolean res = false;
8073         if (rootAncestor != null) {
8074             FocusTraversalPolicy policy = rootAncestor.getFocusTraversalPolicy();
8075             Component toFocus = policy.getComponentBefore(rootAncestor, comp);
8076             if (toFocus == null) {
8077                 toFocus = policy.getDefaultComponent(rootAncestor);
8078             }
8079             if (toFocus != null) {
8080                 res = toFocus.requestFocusInWindow(CausedFocusEvent.Cause.TRAVERSAL_BACKWARD);
8081             }
8082         }
8083         if (clearOnFailure && !res) {
8084             if (focusLog.isLoggable(PlatformLogger.Level.FINER)) {
8085                 focusLog.finer("clear global focus owner");
8086             }
8087             KeyboardFocusManager.getCurrentKeyboardFocusManager().clearGlobalFocusOwnerPriv();
8088         }
8089         if (focusLog.isLoggable(PlatformLogger.Level.FINER)) {
8090             focusLog.finer("returning result: " + res);
8091         }
8092         return res;
8093     }
8094 
8095     /**
8096      * Transfers the focus up one focus traversal cycle. Typically, the focus
8097      * owner is set to this Component's focus cycle root, and the current focus
8098      * cycle root is set to the new focus owner's focus cycle root. If,
8099      * however, this Component's focus cycle root is a Window, then the focus
8100      * owner is set to the focus cycle root's default Component to focus, and
8101      * the current focus cycle root is unchanged.
8102      *
8103      * @see       #requestFocus()
8104      * @see       Container#isFocusCycleRoot()
8105      * @see       Container#setFocusCycleRoot(boolean)
8106      * @since     1.4
8107      */
8108     public void transferFocusUpCycle() {
8109         Container rootAncestor;
8110         for (rootAncestor = getFocusCycleRootAncestor();
8111              rootAncestor != null && !(rootAncestor.isShowing() &&
8112                                        rootAncestor.isFocusable() &&
8113                                        rootAncestor.isEnabled());
8114              rootAncestor = rootAncestor.getFocusCycleRootAncestor()) {
8115         }
8116 
8117         if (rootAncestor != null) {
8118             Container rootAncestorRootAncestor =
8119                 rootAncestor.getFocusCycleRootAncestor();
8120             Container fcr = (rootAncestorRootAncestor != null) ?
8121                 rootAncestorRootAncestor : rootAncestor;
8122 
8123             KeyboardFocusManager.getCurrentKeyboardFocusManager().
8124                 setGlobalCurrentFocusCycleRootPriv(fcr);
8125             rootAncestor.requestFocus(CausedFocusEvent.Cause.TRAVERSAL_UP);
8126         } else {
8127             Window window = getContainingWindow();
8128 
8129             if (window != null) {
8130                 Component toFocus = window.getFocusTraversalPolicy().
8131                     getDefaultComponent(window);
8132                 if (toFocus != null) {
8133                     KeyboardFocusManager.getCurrentKeyboardFocusManager().
8134                         setGlobalCurrentFocusCycleRootPriv(window);
8135                     toFocus.requestFocus(CausedFocusEvent.Cause.TRAVERSAL_UP);
8136                 }
8137             }
8138         }
8139     }
8140 
8141     /**
8142      * Returns <code>true</code> if this <code>Component</code> is the
8143      * focus owner.  This method is obsolete, and has been replaced by
8144      * <code>isFocusOwner()</code>.
8145      *
8146      * @return <code>true</code> if this <code>Component</code> is the
8147      *         focus owner; <code>false</code> otherwise
8148      * @since 1.2
8149      */
8150     public boolean hasFocus() {
8151         return (KeyboardFocusManager.getCurrentKeyboardFocusManager().
8152                 getFocusOwner() == this);
8153     }
8154 
8155     /**
8156      * Returns <code>true</code> if this <code>Component</code> is the
8157      *    focus owner.
8158      *
8159      * @return <code>true</code> if this <code>Component</code> is the
8160      *     focus owner; <code>false</code> otherwise
8161      * @since 1.4
8162      */
8163     public boolean isFocusOwner() {
8164         return hasFocus();
8165     }
8166 
8167     /*
8168      * Used to disallow auto-focus-transfer on disposal of the focus owner
8169      * in the process of disposing its parent container.
8170      */
8171     private boolean autoFocusTransferOnDisposal = true;
8172 
8173     void setAutoFocusTransferOnDisposal(boolean value) {
8174         autoFocusTransferOnDisposal = value;
8175     }
8176 
8177     boolean isAutoFocusTransferOnDisposal() {
8178         return autoFocusTransferOnDisposal;
8179     }
8180 
8181     /**
8182      * Adds the specified popup menu to the component.
8183      * @param     popup the popup menu to be added to the component.
8184      * @see       #remove(MenuComponent)
8185      * @exception NullPointerException if {@code popup} is {@code null}
8186      * @since     1.1
8187      */
8188     public void add(PopupMenu popup) {
8189         synchronized (getTreeLock()) {
8190             if (popup.parent != null) {
8191                 popup.parent.remove(popup);
8192             }
8193             if (popups == null) {
8194                 popups = new Vector<PopupMenu>();
8195             }
8196             popups.addElement(popup);
8197             popup.parent = this;
8198 
8199             if (peer != null) {
8200                 if (popup.peer == null) {
8201                     popup.addNotify();
8202                 }
8203             }
8204         }
8205     }
8206 
8207     /**
8208      * Removes the specified popup menu from the component.
8209      * @param     popup the popup menu to be removed
8210      * @see       #add(PopupMenu)
8211      * @since     1.1
8212      */
8213     @SuppressWarnings("unchecked")
8214     public void remove(MenuComponent popup) {
8215         synchronized (getTreeLock()) {
8216             if (popups == null) {
8217                 return;
8218             }
8219             int index = popups.indexOf(popup);
8220             if (index >= 0) {
8221                 PopupMenu pmenu = (PopupMenu)popup;
8222                 if (pmenu.peer != null) {
8223                     pmenu.removeNotify();
8224                 }
8225                 pmenu.parent = null;
8226                 popups.removeElementAt(index);
8227                 if (popups.size() == 0) {
8228                     popups = null;
8229                 }
8230             }
8231         }
8232     }
8233 
8234     /**
8235      * Returns a string representing the state of this component. This
8236      * method is intended to be used only for debugging purposes, and the
8237      * content and format of the returned string may vary between
8238      * implementations. The returned string may be empty but may not be
8239      * <code>null</code>.
8240      *
8241      * @return  a string representation of this component's state
8242      * @since     1.0
8243      */
8244     protected String paramString() {
8245         final String thisName = Objects.toString(getName(), "");
8246         final String invalid = isValid() ? "" : ",invalid";
8247         final String hidden = visible ? "" : ",hidden";
8248         final String disabled = enabled ? "" : ",disabled";
8249         return thisName + ',' + x + ',' + y + ',' + width + 'x' + height
8250                 + invalid + hidden + disabled;
8251     }
8252 
8253     /**
8254      * Returns a string representation of this component and its values.
8255      * @return    a string representation of this component
8256      * @since     1.0
8257      */
8258     public String toString() {
8259         return getClass().getName() + '[' + paramString() + ']';
8260     }
8261 
8262     /**
8263      * Prints a listing of this component to the standard system output
8264      * stream <code>System.out</code>.
8265      * @see       java.lang.System#out
8266      * @since     1.0
8267      */
8268     public void list() {
8269         list(System.out, 0);
8270     }
8271 
8272     /**
8273      * Prints a listing of this component to the specified output
8274      * stream.
8275      * @param    out   a print stream
8276      * @throws   NullPointerException if {@code out} is {@code null}
8277      * @since    1.0
8278      */
8279     public void list(PrintStream out) {
8280         list(out, 0);
8281     }
8282 
8283     /**
8284      * Prints out a list, starting at the specified indentation, to the
8285      * specified print stream.
8286      * @param     out      a print stream
8287      * @param     indent   number of spaces to indent
8288      * @see       java.io.PrintStream#println(java.lang.Object)
8289      * @throws    NullPointerException if {@code out} is {@code null}
8290      * @since     1.0
8291      */
8292     public void list(PrintStream out, int indent) {
8293         for (int i = 0 ; i < indent ; i++) {
8294             out.print(" ");
8295         }
8296         out.println(this);
8297     }
8298 
8299     /**
8300      * Prints a listing to the specified print writer.
8301      * @param  out  the print writer to print to
8302      * @throws NullPointerException if {@code out} is {@code null}
8303      * @since 1.1
8304      */
8305     public void list(PrintWriter out) {
8306         list(out, 0);
8307     }
8308 
8309     /**
8310      * Prints out a list, starting at the specified indentation, to
8311      * the specified print writer.
8312      * @param out the print writer to print to
8313      * @param indent the number of spaces to indent
8314      * @throws NullPointerException if {@code out} is {@code null}
8315      * @see       java.io.PrintStream#println(java.lang.Object)
8316      * @since 1.1
8317      */
8318     public void list(PrintWriter out, int indent) {
8319         for (int i = 0 ; i < indent ; i++) {
8320             out.print(" ");
8321         }
8322         out.println(this);
8323     }
8324 
8325     /*
8326      * Fetches the native container somewhere higher up in the component
8327      * tree that contains this component.
8328      */
8329     final Container getNativeContainer() {
8330         Container p = getContainer();
8331         while (p != null && p.peer instanceof LightweightPeer) {
8332             p = p.getContainer();
8333         }
8334         return p;
8335     }
8336 
8337     /**
8338      * Adds a PropertyChangeListener to the listener list. The listener is
8339      * registered for all bound properties of this class, including the
8340      * following:
8341      * <ul>
8342      *    <li>this Component's font ("font")</li>
8343      *    <li>this Component's background color ("background")</li>
8344      *    <li>this Component's foreground color ("foreground")</li>
8345      *    <li>this Component's focusability ("focusable")</li>
8346      *    <li>this Component's focus traversal keys enabled state
8347      *        ("focusTraversalKeysEnabled")</li>
8348      *    <li>this Component's Set of FORWARD_TRAVERSAL_KEYS
8349      *        ("forwardFocusTraversalKeys")</li>
8350      *    <li>this Component's Set of BACKWARD_TRAVERSAL_KEYS
8351      *        ("backwardFocusTraversalKeys")</li>
8352      *    <li>this Component's Set of UP_CYCLE_TRAVERSAL_KEYS
8353      *        ("upCycleFocusTraversalKeys")</li>
8354      *    <li>this Component's preferred size ("preferredSize")</li>
8355      *    <li>this Component's minimum size ("minimumSize")</li>
8356      *    <li>this Component's maximum size ("maximumSize")</li>
8357      *    <li>this Component's name ("name")</li>
8358      * </ul>
8359      * Note that if this <code>Component</code> is inheriting a bound property, then no
8360      * event will be fired in response to a change in the inherited property.
8361      * <p>
8362      * If <code>listener</code> is <code>null</code>,
8363      * no exception is thrown and no action is performed.
8364      *
8365      * @param    listener  the property change listener to be added
8366      *
8367      * @see #removePropertyChangeListener
8368      * @see #getPropertyChangeListeners
8369      * @see #addPropertyChangeListener(java.lang.String, java.beans.PropertyChangeListener)
8370      */
8371     public void addPropertyChangeListener(
8372                                                        PropertyChangeListener listener) {
8373         synchronized (getObjectLock()) {
8374             if (listener == null) {
8375                 return;
8376             }
8377             if (changeSupport == null) {
8378                 changeSupport = new PropertyChangeSupport(this);
8379             }
8380             changeSupport.addPropertyChangeListener(listener);
8381         }
8382     }
8383 
8384     /**
8385      * Removes a PropertyChangeListener from the listener list. This method
8386      * should be used to remove PropertyChangeListeners that were registered
8387      * for all bound properties of this class.
8388      * <p>
8389      * If listener is null, no exception is thrown and no action is performed.
8390      *
8391      * @param listener the PropertyChangeListener to be removed
8392      *
8393      * @see #addPropertyChangeListener
8394      * @see #getPropertyChangeListeners
8395      * @see #removePropertyChangeListener(java.lang.String,java.beans.PropertyChangeListener)
8396      */
8397     public void removePropertyChangeListener(
8398                                                           PropertyChangeListener listener) {
8399         synchronized (getObjectLock()) {
8400             if (listener == null || changeSupport == null) {
8401                 return;
8402             }
8403             changeSupport.removePropertyChangeListener(listener);
8404         }
8405     }
8406 
8407     /**
8408      * Returns an array of all the property change listeners
8409      * registered on this component.
8410      *
8411      * @return all of this component's <code>PropertyChangeListener</code>s
8412      *         or an empty array if no property change
8413      *         listeners are currently registered
8414      *
8415      * @see      #addPropertyChangeListener
8416      * @see      #removePropertyChangeListener
8417      * @see      #getPropertyChangeListeners(java.lang.String)
8418      * @see      java.beans.PropertyChangeSupport#getPropertyChangeListeners
8419      * @since    1.4
8420      */
8421     public PropertyChangeListener[] getPropertyChangeListeners() {
8422         synchronized (getObjectLock()) {
8423             if (changeSupport == null) {
8424                 return new PropertyChangeListener[0];
8425             }
8426             return changeSupport.getPropertyChangeListeners();
8427         }
8428     }
8429 
8430     /**
8431      * Adds a PropertyChangeListener to the listener list for a specific
8432      * property. The specified property may be user-defined, or one of the
8433      * following:
8434      * <ul>
8435      *    <li>this Component's font ("font")</li>
8436      *    <li>this Component's background color ("background")</li>
8437      *    <li>this Component's foreground color ("foreground")</li>
8438      *    <li>this Component's focusability ("focusable")</li>
8439      *    <li>this Component's focus traversal keys enabled state
8440      *        ("focusTraversalKeysEnabled")</li>
8441      *    <li>this Component's Set of FORWARD_TRAVERSAL_KEYS
8442      *        ("forwardFocusTraversalKeys")</li>
8443      *    <li>this Component's Set of BACKWARD_TRAVERSAL_KEYS
8444      *        ("backwardFocusTraversalKeys")</li>
8445      *    <li>this Component's Set of UP_CYCLE_TRAVERSAL_KEYS
8446      *        ("upCycleFocusTraversalKeys")</li>
8447      * </ul>
8448      * Note that if this <code>Component</code> is inheriting a bound property, then no
8449      * event will be fired in response to a change in the inherited property.
8450      * <p>
8451      * If <code>propertyName</code> or <code>listener</code> is <code>null</code>,
8452      * no exception is thrown and no action is taken.
8453      *
8454      * @param propertyName one of the property names listed above
8455      * @param listener the property change listener to be added
8456      *
8457      * @see #removePropertyChangeListener(java.lang.String, java.beans.PropertyChangeListener)
8458      * @see #getPropertyChangeListeners(java.lang.String)
8459      * @see #addPropertyChangeListener(java.lang.String, java.beans.PropertyChangeListener)
8460      */
8461     public void addPropertyChangeListener(
8462                                                        String propertyName,
8463                                                        PropertyChangeListener listener) {
8464         synchronized (getObjectLock()) {
8465             if (listener == null) {
8466                 return;
8467             }
8468             if (changeSupport == null) {
8469                 changeSupport = new PropertyChangeSupport(this);
8470             }
8471             changeSupport.addPropertyChangeListener(propertyName, listener);
8472         }
8473     }
8474 
8475     /**
8476      * Removes a <code>PropertyChangeListener</code> from the listener
8477      * list for a specific property. This method should be used to remove
8478      * <code>PropertyChangeListener</code>s
8479      * that were registered for a specific bound property.
8480      * <p>
8481      * If <code>propertyName</code> or <code>listener</code> is <code>null</code>,
8482      * no exception is thrown and no action is taken.
8483      *
8484      * @param propertyName a valid property name
8485      * @param listener the PropertyChangeListener to be removed
8486      *
8487      * @see #addPropertyChangeListener(java.lang.String, java.beans.PropertyChangeListener)
8488      * @see #getPropertyChangeListeners(java.lang.String)
8489      * @see #removePropertyChangeListener(java.beans.PropertyChangeListener)
8490      */
8491     public void removePropertyChangeListener(
8492                                                           String propertyName,
8493                                                           PropertyChangeListener listener) {
8494         synchronized (getObjectLock()) {
8495             if (listener == null || changeSupport == null) {
8496                 return;
8497             }
8498             changeSupport.removePropertyChangeListener(propertyName, listener);
8499         }
8500     }
8501 
8502     /**
8503      * Returns an array of all the listeners which have been associated
8504      * with the named property.
8505      *
8506      * @param  propertyName the property name
8507      * @return all of the <code>PropertyChangeListener</code>s associated with
8508      *         the named property; if no such listeners have been added or
8509      *         if <code>propertyName</code> is <code>null</code>, an empty
8510      *         array is returned
8511      *
8512      * @see #addPropertyChangeListener(java.lang.String, java.beans.PropertyChangeListener)
8513      * @see #removePropertyChangeListener(java.lang.String, java.beans.PropertyChangeListener)
8514      * @see #getPropertyChangeListeners
8515      * @since 1.4
8516      */
8517     public PropertyChangeListener[] getPropertyChangeListeners(String propertyName) {
8518         synchronized (getObjectLock()) {
8519             if (changeSupport == null) {
8520                 return new PropertyChangeListener[0];
8521             }
8522             return changeSupport.getPropertyChangeListeners(propertyName);
8523         }
8524     }
8525 
8526     /**
8527      * Support for reporting bound property changes for Object properties.
8528      * This method can be called when a bound property has changed and it will
8529      * send the appropriate PropertyChangeEvent to any registered
8530      * PropertyChangeListeners.
8531      *
8532      * @param propertyName the property whose value has changed
8533      * @param oldValue the property's previous value
8534      * @param newValue the property's new value
8535      */
8536     protected void firePropertyChange(String propertyName,
8537                                       Object oldValue, Object newValue) {
8538         PropertyChangeSupport changeSupport;
8539         synchronized (getObjectLock()) {
8540             changeSupport = this.changeSupport;
8541         }
8542         if (changeSupport == null ||
8543             (oldValue != null && newValue != null && oldValue.equals(newValue))) {
8544             return;
8545         }
8546         changeSupport.firePropertyChange(propertyName, oldValue, newValue);
8547     }
8548 
8549     /**
8550      * Support for reporting bound property changes for boolean properties.
8551      * This method can be called when a bound property has changed and it will
8552      * send the appropriate PropertyChangeEvent to any registered
8553      * PropertyChangeListeners.
8554      *
8555      * @param propertyName the property whose value has changed
8556      * @param oldValue the property's previous value
8557      * @param newValue the property's new value
8558      * @since 1.4
8559      */
8560     protected void firePropertyChange(String propertyName,
8561                                       boolean oldValue, boolean newValue) {
8562         PropertyChangeSupport changeSupport = this.changeSupport;
8563         if (changeSupport == null || oldValue == newValue) {
8564             return;
8565         }
8566         changeSupport.firePropertyChange(propertyName, oldValue, newValue);
8567     }
8568 
8569     /**
8570      * Support for reporting bound property changes for integer properties.
8571      * This method can be called when a bound property has changed and it will
8572      * send the appropriate PropertyChangeEvent to any registered
8573      * PropertyChangeListeners.
8574      *
8575      * @param propertyName the property whose value has changed
8576      * @param oldValue the property's previous value
8577      * @param newValue the property's new value
8578      * @since 1.4
8579      */
8580     protected void firePropertyChange(String propertyName,
8581                                       int oldValue, int newValue) {
8582         PropertyChangeSupport changeSupport = this.changeSupport;
8583         if (changeSupport == null || oldValue == newValue) {
8584             return;
8585         }
8586         changeSupport.firePropertyChange(propertyName, oldValue, newValue);
8587     }
8588 
8589     /**
8590      * Reports a bound property change.
8591      *
8592      * @param propertyName the programmatic name of the property
8593      *          that was changed
8594      * @param oldValue the old value of the property (as a byte)
8595      * @param newValue the new value of the property (as a byte)
8596      * @see #firePropertyChange(java.lang.String, java.lang.Object,
8597      *          java.lang.Object)
8598      * @since 1.5
8599      */
8600     public void firePropertyChange(String propertyName, byte oldValue, byte newValue) {
8601         if (changeSupport == null || oldValue == newValue) {
8602             return;
8603         }
8604         firePropertyChange(propertyName, Byte.valueOf(oldValue), Byte.valueOf(newValue));
8605     }
8606 
8607     /**
8608      * Reports a bound property change.
8609      *
8610      * @param propertyName the programmatic name of the property
8611      *          that was changed
8612      * @param oldValue the old value of the property (as a char)
8613      * @param newValue the new value of the property (as a char)
8614      * @see #firePropertyChange(java.lang.String, java.lang.Object,
8615      *          java.lang.Object)
8616      * @since 1.5
8617      */
8618     public void firePropertyChange(String propertyName, char oldValue, char newValue) {
8619         if (changeSupport == null || oldValue == newValue) {
8620             return;
8621         }
8622         firePropertyChange(propertyName, Character.valueOf(oldValue), Character.valueOf(newValue));
8623     }
8624 
8625     /**
8626      * Reports a bound property change.
8627      *
8628      * @param propertyName the programmatic name of the property
8629      *          that was changed
8630      * @param oldValue the old value of the property (as a short)
8631      * @param newValue the new value of the property (as a short)
8632      * @see #firePropertyChange(java.lang.String, java.lang.Object,
8633      *          java.lang.Object)
8634      * @since 1.5
8635      */
8636     public void firePropertyChange(String propertyName, short oldValue, short newValue) {
8637         if (changeSupport == null || oldValue == newValue) {
8638             return;
8639         }
8640         firePropertyChange(propertyName, Short.valueOf(oldValue), Short.valueOf(newValue));
8641     }
8642 
8643 
8644     /**
8645      * Reports a bound property change.
8646      *
8647      * @param propertyName the programmatic name of the property
8648      *          that was changed
8649      * @param oldValue the old value of the property (as a long)
8650      * @param newValue the new value of the property (as a long)
8651      * @see #firePropertyChange(java.lang.String, java.lang.Object,
8652      *          java.lang.Object)
8653      * @since 1.5
8654      */
8655     public void firePropertyChange(String propertyName, long oldValue, long newValue) {
8656         if (changeSupport == null || oldValue == newValue) {
8657             return;
8658         }
8659         firePropertyChange(propertyName, Long.valueOf(oldValue), Long.valueOf(newValue));
8660     }
8661 
8662     /**
8663      * Reports a bound property change.
8664      *
8665      * @param propertyName the programmatic name of the property
8666      *          that was changed
8667      * @param oldValue the old value of the property (as a float)
8668      * @param newValue the new value of the property (as a float)
8669      * @see #firePropertyChange(java.lang.String, java.lang.Object,
8670      *          java.lang.Object)
8671      * @since 1.5
8672      */
8673     public void firePropertyChange(String propertyName, float oldValue, float newValue) {
8674         if (changeSupport == null || oldValue == newValue) {
8675             return;
8676         }
8677         firePropertyChange(propertyName, Float.valueOf(oldValue), Float.valueOf(newValue));
8678     }
8679 
8680     /**
8681      * Reports a bound property change.
8682      *
8683      * @param propertyName the programmatic name of the property
8684      *          that was changed
8685      * @param oldValue the old value of the property (as a double)
8686      * @param newValue the new value of the property (as a double)
8687      * @see #firePropertyChange(java.lang.String, java.lang.Object,
8688      *          java.lang.Object)
8689      * @since 1.5
8690      */
8691     public void firePropertyChange(String propertyName, double oldValue, double newValue) {
8692         if (changeSupport == null || oldValue == newValue) {
8693             return;
8694         }
8695         firePropertyChange(propertyName, Double.valueOf(oldValue), Double.valueOf(newValue));
8696     }
8697 
8698 
8699     // Serialization support.
8700 
8701     /**
8702      * Component Serialized Data Version.
8703      *
8704      * @serial
8705      */
8706     private int componentSerializedDataVersion = 4;
8707 
8708     /**
8709      * This hack is for Swing serialization. It will invoke
8710      * the Swing package private method <code>compWriteObjectNotify</code>.
8711      */
8712     private void doSwingSerialization() {
8713         Package swingPackage = Package.getPackage("javax.swing");
8714         // For Swing serialization to correctly work Swing needs to
8715         // be notified before Component does it's serialization.  This
8716         // hack accommodates this.
8717         //
8718         // Swing classes MUST be loaded by the bootstrap class loader,
8719         // otherwise we don't consider them.
8720         for (Class<?> klass = Component.this.getClass(); klass != null;
8721                    klass = klass.getSuperclass()) {
8722             if (klass.getPackage() == swingPackage &&
8723                       klass.getClassLoader() == null) {
8724                 final Class<?> swingClass = klass;
8725                 // Find the first override of the compWriteObjectNotify method
8726                 Method[] methods = AccessController.doPrivileged(
8727                                                                  new PrivilegedAction<Method[]>() {
8728                                                                      public Method[] run() {
8729                                                                          return swingClass.getDeclaredMethods();
8730                                                                      }
8731                                                                  });
8732                 for (int counter = methods.length - 1; counter >= 0;
8733                      counter--) {
8734                     final Method method = methods[counter];
8735                     if (method.getName().equals("compWriteObjectNotify")){
8736                         // We found it, use doPrivileged to make it accessible
8737                         // to use.
8738                         AccessController.doPrivileged(new PrivilegedAction<Void>() {
8739                                 public Void run() {
8740                                     method.setAccessible(true);
8741                                     return null;
8742                                 }
8743                             });
8744                         // Invoke the method
8745                         try {
8746                             method.invoke(this, (Object[]) null);
8747                         } catch (IllegalAccessException iae) {
8748                         } catch (InvocationTargetException ite) {
8749                         }
8750                         // We're done, bail.
8751                         return;
8752                     }
8753                 }
8754             }
8755         }
8756     }
8757 
8758     /**
8759      * Writes default serializable fields to stream.  Writes
8760      * a variety of serializable listeners as optional data.
8761      * The non-serializable listeners are detected and
8762      * no attempt is made to serialize them.
8763      *
8764      * @param s the <code>ObjectOutputStream</code> to write
8765      * @serialData <code>null</code> terminated sequence of
8766      *   0 or more pairs; the pair consists of a <code>String</code>
8767      *   and an <code>Object</code>; the <code>String</code> indicates
8768      *   the type of object and is one of the following (as of 1.4):
8769      *   <code>componentListenerK</code> indicating an
8770      *     <code>ComponentListener</code> object;
8771      *   <code>focusListenerK</code> indicating an
8772      *     <code>FocusListener</code> object;
8773      *   <code>keyListenerK</code> indicating an
8774      *     <code>KeyListener</code> object;
8775      *   <code>mouseListenerK</code> indicating an
8776      *     <code>MouseListener</code> object;
8777      *   <code>mouseMotionListenerK</code> indicating an
8778      *     <code>MouseMotionListener</code> object;
8779      *   <code>inputMethodListenerK</code> indicating an
8780      *     <code>InputMethodListener</code> object;
8781      *   <code>hierarchyListenerK</code> indicating an
8782      *     <code>HierarchyListener</code> object;
8783      *   <code>hierarchyBoundsListenerK</code> indicating an
8784      *     <code>HierarchyBoundsListener</code> object;
8785      *   <code>mouseWheelListenerK</code> indicating an
8786      *     <code>MouseWheelListener</code> object
8787      * @serialData an optional <code>ComponentOrientation</code>
8788      *    (after <code>inputMethodListener</code>, as of 1.2)
8789      *
8790      * @see AWTEventMulticaster#save(java.io.ObjectOutputStream, java.lang.String, java.util.EventListener)
8791      * @see #componentListenerK
8792      * @see #focusListenerK
8793      * @see #keyListenerK
8794      * @see #mouseListenerK
8795      * @see #mouseMotionListenerK
8796      * @see #inputMethodListenerK
8797      * @see #hierarchyListenerK
8798      * @see #hierarchyBoundsListenerK
8799      * @see #mouseWheelListenerK
8800      * @see #readObject(ObjectInputStream)
8801      */
8802     private void writeObject(ObjectOutputStream s)
8803       throws IOException
8804     {
8805         doSwingSerialization();
8806 
8807         s.defaultWriteObject();
8808 
8809         AWTEventMulticaster.save(s, componentListenerK, componentListener);
8810         AWTEventMulticaster.save(s, focusListenerK, focusListener);
8811         AWTEventMulticaster.save(s, keyListenerK, keyListener);
8812         AWTEventMulticaster.save(s, mouseListenerK, mouseListener);
8813         AWTEventMulticaster.save(s, mouseMotionListenerK, mouseMotionListener);
8814         AWTEventMulticaster.save(s, inputMethodListenerK, inputMethodListener);
8815 
8816         s.writeObject(null);
8817         s.writeObject(componentOrientation);
8818 
8819         AWTEventMulticaster.save(s, hierarchyListenerK, hierarchyListener);
8820         AWTEventMulticaster.save(s, hierarchyBoundsListenerK,
8821                                  hierarchyBoundsListener);
8822         s.writeObject(null);
8823 
8824         AWTEventMulticaster.save(s, mouseWheelListenerK, mouseWheelListener);
8825         s.writeObject(null);
8826 
8827     }
8828 
8829     /**
8830      * Reads the <code>ObjectInputStream</code> and if it isn't
8831      * <code>null</code> adds a listener to receive a variety
8832      * of events fired by the component.
8833      * Unrecognized keys or values will be ignored.
8834      *
8835      * @param s the <code>ObjectInputStream</code> to read
8836      * @see #writeObject(ObjectOutputStream)
8837      */
8838     private void readObject(ObjectInputStream s)
8839       throws ClassNotFoundException, IOException
8840     {
8841         objectLock = new Object();
8842 
8843         acc = AccessController.getContext();
8844 
8845         s.defaultReadObject();
8846 
8847         appContext = AppContext.getAppContext();
8848         coalescingEnabled = checkCoalescing();
8849         if (componentSerializedDataVersion < 4) {
8850             // These fields are non-transient and rely on default
8851             // serialization. However, the default values are insufficient,
8852             // so we need to set them explicitly for object data streams prior
8853             // to 1.4.
8854             focusable = true;
8855             isFocusTraversableOverridden = FOCUS_TRAVERSABLE_UNKNOWN;
8856             initializeFocusTraversalKeys();
8857             focusTraversalKeysEnabled = true;
8858         }
8859 
8860         Object keyOrNull;
8861         while(null != (keyOrNull = s.readObject())) {
8862             String key = ((String)keyOrNull).intern();
8863 
8864             if (componentListenerK == key)
8865                 addComponentListener((ComponentListener)(s.readObject()));
8866 
8867             else if (focusListenerK == key)
8868                 addFocusListener((FocusListener)(s.readObject()));
8869 
8870             else if (keyListenerK == key)
8871                 addKeyListener((KeyListener)(s.readObject()));
8872 
8873             else if (mouseListenerK == key)
8874                 addMouseListener((MouseListener)(s.readObject()));
8875 
8876             else if (mouseMotionListenerK == key)
8877                 addMouseMotionListener((MouseMotionListener)(s.readObject()));
8878 
8879             else if (inputMethodListenerK == key)
8880                 addInputMethodListener((InputMethodListener)(s.readObject()));
8881 
8882             else // skip value for unrecognized key
8883                 s.readObject();
8884 
8885         }
8886 
8887         // Read the component's orientation if it's present
8888         Object orient = null;
8889 
8890         try {
8891             orient = s.readObject();
8892         } catch (java.io.OptionalDataException e) {
8893             // JDK 1.1 instances will not have this optional data.
8894             // e.eof will be true to indicate that there is no more
8895             // data available for this object.
8896             // If e.eof is not true, throw the exception as it
8897             // might have been caused by reasons unrelated to
8898             // componentOrientation.
8899 
8900             if (!e.eof)  {
8901                 throw (e);
8902             }
8903         }
8904 
8905         if (orient != null) {
8906             componentOrientation = (ComponentOrientation)orient;
8907         } else {
8908             componentOrientation = ComponentOrientation.UNKNOWN;
8909         }
8910 
8911         try {
8912             while(null != (keyOrNull = s.readObject())) {
8913                 String key = ((String)keyOrNull).intern();
8914 
8915                 if (hierarchyListenerK == key) {
8916                     addHierarchyListener((HierarchyListener)(s.readObject()));
8917                 }
8918                 else if (hierarchyBoundsListenerK == key) {
8919                     addHierarchyBoundsListener((HierarchyBoundsListener)
8920                                                (s.readObject()));
8921                 }
8922                 else {
8923                     // skip value for unrecognized key
8924                     s.readObject();
8925                 }
8926             }
8927         } catch (java.io.OptionalDataException e) {
8928             // JDK 1.1/1.2 instances will not have this optional data.
8929             // e.eof will be true to indicate that there is no more
8930             // data available for this object.
8931             // If e.eof is not true, throw the exception as it
8932             // might have been caused by reasons unrelated to
8933             // hierarchy and hierarchyBounds listeners.
8934 
8935             if (!e.eof)  {
8936                 throw (e);
8937             }
8938         }
8939 
8940         try {
8941             while (null != (keyOrNull = s.readObject())) {
8942                 String key = ((String)keyOrNull).intern();
8943 
8944                 if (mouseWheelListenerK == key) {
8945                     addMouseWheelListener((MouseWheelListener)(s.readObject()));
8946                 }
8947                 else {
8948                     // skip value for unrecognized key
8949                     s.readObject();
8950                 }
8951             }
8952         } catch (java.io.OptionalDataException e) {
8953             // pre-1.3 instances will not have this optional data.
8954             // e.eof will be true to indicate that there is no more
8955             // data available for this object.
8956             // If e.eof is not true, throw the exception as it
8957             // might have been caused by reasons unrelated to
8958             // mouse wheel listeners
8959 
8960             if (!e.eof)  {
8961                 throw (e);
8962             }
8963         }
8964 
8965         if (popups != null) {
8966             int npopups = popups.size();
8967             for (int i = 0 ; i < npopups ; i++) {
8968                 PopupMenu popup = popups.elementAt(i);
8969                 popup.parent = this;
8970             }
8971         }
8972     }
8973 
8974     /**
8975      * Sets the language-sensitive orientation that is to be used to order
8976      * the elements or text within this component.  Language-sensitive
8977      * <code>LayoutManager</code> and <code>Component</code>
8978      * subclasses will use this property to
8979      * determine how to lay out and draw components.
8980      * <p>
8981      * At construction time, a component's orientation is set to
8982      * <code>ComponentOrientation.UNKNOWN</code>,
8983      * indicating that it has not been specified
8984      * explicitly.  The UNKNOWN orientation behaves the same as
8985      * <code>ComponentOrientation.LEFT_TO_RIGHT</code>.
8986      * <p>
8987      * To set the orientation of a single component, use this method.
8988      * To set the orientation of an entire component
8989      * hierarchy, use
8990      * {@link #applyComponentOrientation applyComponentOrientation}.
8991      * <p>
8992      * This method changes layout-related information, and therefore,
8993      * invalidates the component hierarchy.
8994      *
8995      * @param  o the orientation to be set
8996      *
8997      * @see ComponentOrientation
8998      * @see #invalidate
8999      *
9000      * @author Laura Werner, IBM
9001      * @beaninfo
9002      *       bound: true
9003      */
9004     public void setComponentOrientation(ComponentOrientation o) {
9005         ComponentOrientation oldValue = componentOrientation;
9006         componentOrientation = o;
9007 
9008         // This is a bound property, so report the change to
9009         // any registered listeners.  (Cheap if there are none.)
9010         firePropertyChange("componentOrientation", oldValue, o);
9011 
9012         // This could change the preferred size of the Component.
9013         invalidateIfValid();
9014     }
9015 
9016     /**
9017      * Retrieves the language-sensitive orientation that is to be used to order
9018      * the elements or text within this component.  <code>LayoutManager</code>
9019      * and <code>Component</code>
9020      * subclasses that wish to respect orientation should call this method to
9021      * get the component's orientation before performing layout or drawing.
9022      *
9023      * @return the orientation to order the elements or text
9024      * @see ComponentOrientation
9025      *
9026      * @author Laura Werner, IBM
9027      */
9028     public ComponentOrientation getComponentOrientation() {
9029         return componentOrientation;
9030     }
9031 
9032     /**
9033      * Sets the <code>ComponentOrientation</code> property of this component
9034      * and all components contained within it.
9035      * <p>
9036      * This method changes layout-related information, and therefore,
9037      * invalidates the component hierarchy.
9038      *
9039      *
9040      * @param orientation the new component orientation of this component and
9041      *        the components contained within it.
9042      * @exception NullPointerException if <code>orientation</code> is null.
9043      * @see #setComponentOrientation
9044      * @see #getComponentOrientation
9045      * @see #invalidate
9046      * @since 1.4
9047      */
9048     public void applyComponentOrientation(ComponentOrientation orientation) {
9049         if (orientation == null) {
9050             throw new NullPointerException();
9051         }
9052         setComponentOrientation(orientation);
9053     }
9054 
9055     final boolean canBeFocusOwner() {
9056         // It is enabled, visible, focusable.
9057         if (isEnabled() && isDisplayable() && isVisible() && isFocusable()) {
9058             return true;
9059         }
9060         return false;
9061     }
9062 
9063     /**
9064      * Checks that this component meets the prerequisites to be focus owner:
9065      * - it is enabled, visible, focusable
9066      * - it's parents are all enabled and showing
9067      * - top-level window is focusable
9068      * - if focus cycle root has DefaultFocusTraversalPolicy then it also checks that this policy accepts
9069      * this component as focus owner
9070      * @since 1.5
9071      */
9072     final boolean canBeFocusOwnerRecursively() {
9073         // - it is enabled, visible, focusable
9074         if (!canBeFocusOwner()) {
9075             return false;
9076         }
9077 
9078         // - it's parents are all enabled and showing
9079         synchronized(getTreeLock()) {
9080             if (parent != null) {
9081                 return parent.canContainFocusOwner(this);
9082             }
9083         }
9084         return true;
9085     }
9086 
9087     /**
9088      * Fix the location of the HW component in a LW container hierarchy.
9089      */
9090     final void relocateComponent() {
9091         synchronized (getTreeLock()) {
9092             if (peer == null) {
9093                 return;
9094             }
9095             int nativeX = x;
9096             int nativeY = y;
9097             for (Component cont = getContainer();
9098                     cont != null && cont.isLightweight();
9099                     cont = cont.getContainer())
9100             {
9101                 nativeX += cont.x;
9102                 nativeY += cont.y;
9103             }
9104             peer.setBounds(nativeX, nativeY, width, height,
9105                     ComponentPeer.SET_LOCATION);
9106         }
9107     }
9108 
9109     /**
9110      * Returns the <code>Window</code> ancestor of the component.
9111      * @return Window ancestor of the component or component by itself if it is Window;
9112      *         null, if component is not a part of window hierarchy
9113      */
9114     Window getContainingWindow() {
9115         return SunToolkit.getContainingWindow(this);
9116     }
9117 
9118     /**
9119      * Initialize JNI field and method IDs
9120      */
9121     private static native void initIDs();
9122 
9123     /*
9124      * --- Accessibility Support ---
9125      *
9126      *  Component will contain all of the methods in interface Accessible,
9127      *  though it won't actually implement the interface - that will be up
9128      *  to the individual objects which extend Component.
9129      */
9130 
9131     /**
9132      * The {@code AccessibleContext} associated with this {@code Component}.
9133      */
9134     protected AccessibleContext accessibleContext = null;
9135 
9136     /**
9137      * Gets the <code>AccessibleContext</code> associated
9138      * with this <code>Component</code>.
9139      * The method implemented by this base
9140      * class returns null.  Classes that extend <code>Component</code>
9141      * should implement this method to return the
9142      * <code>AccessibleContext</code> associated with the subclass.
9143      *
9144      *
9145      * @return the <code>AccessibleContext</code> of this
9146      *    <code>Component</code>
9147      * @since 1.3
9148      */
9149     public AccessibleContext getAccessibleContext() {
9150         return accessibleContext;
9151     }
9152 
9153     /**
9154      * Inner class of Component used to provide default support for
9155      * accessibility.  This class is not meant to be used directly by
9156      * application developers, but is instead meant only to be
9157      * subclassed by component developers.
9158      * <p>
9159      * The class used to obtain the accessible role for this object.
9160      * @since 1.3
9161      */
9162     protected abstract class AccessibleAWTComponent extends AccessibleContext
9163         implements Serializable, AccessibleComponent {
9164 
9165         private static final long serialVersionUID = 642321655757800191L;
9166 
9167         /**
9168          * Though the class is abstract, this should be called by
9169          * all sub-classes.
9170          */
9171         protected AccessibleAWTComponent() {
9172         }
9173 
9174         /**
9175          * Number of PropertyChangeListener objects registered. It's used
9176          * to add/remove ComponentListener and FocusListener to track
9177          * target Component's state.
9178          */
9179         private transient volatile int propertyListenersCount = 0;
9180 
9181         /**
9182          * A component listener to track show/hide/resize events
9183          * and convert them to PropertyChange events.
9184          */
9185         protected ComponentListener accessibleAWTComponentHandler = null;
9186 
9187         /**
9188          * A listener to track focus events
9189          * and convert them to PropertyChange events.
9190          */
9191         protected FocusListener accessibleAWTFocusHandler = null;
9192 
9193         /**
9194          * Fire PropertyChange listener, if one is registered,
9195          * when shown/hidden..
9196          * @since 1.3
9197          */
9198         protected class AccessibleAWTComponentHandler implements ComponentListener {
9199             public void componentHidden(ComponentEvent e)  {
9200                 if (accessibleContext != null) {
9201                     accessibleContext.firePropertyChange(
9202                                                          AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
9203                                                          AccessibleState.VISIBLE, null);
9204                 }
9205             }
9206 
9207             public void componentShown(ComponentEvent e)  {
9208                 if (accessibleContext != null) {
9209                     accessibleContext.firePropertyChange(
9210                                                          AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
9211                                                          null, AccessibleState.VISIBLE);
9212                 }
9213             }
9214 
9215             public void componentMoved(ComponentEvent e)  {
9216             }
9217 
9218             public void componentResized(ComponentEvent e)  {
9219             }
9220         } // inner class AccessibleAWTComponentHandler
9221 
9222 
9223         /**
9224          * Fire PropertyChange listener, if one is registered,
9225          * when focus events happen
9226          * @since 1.3
9227          */
9228         protected class AccessibleAWTFocusHandler implements FocusListener {
9229             public void focusGained(FocusEvent event) {
9230                 if (accessibleContext != null) {
9231                     accessibleContext.firePropertyChange(
9232                                                          AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
9233                                                          null, AccessibleState.FOCUSED);
9234                 }
9235             }
9236             public void focusLost(FocusEvent event) {
9237                 if (accessibleContext != null) {
9238                     accessibleContext.firePropertyChange(
9239                                                          AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
9240                                                          AccessibleState.FOCUSED, null);
9241                 }
9242             }
9243         }  // inner class AccessibleAWTFocusHandler
9244 
9245 
9246         /**
9247          * Adds a <code>PropertyChangeListener</code> to the listener list.
9248          *
9249          * @param listener  the property change listener to be added
9250          */
9251         public void addPropertyChangeListener(PropertyChangeListener listener) {
9252             if (accessibleAWTComponentHandler == null) {
9253                 accessibleAWTComponentHandler = new AccessibleAWTComponentHandler();
9254             }
9255             if (accessibleAWTFocusHandler == null) {
9256                 accessibleAWTFocusHandler = new AccessibleAWTFocusHandler();
9257             }
9258             if (propertyListenersCount++ == 0) {
9259                 Component.this.addComponentListener(accessibleAWTComponentHandler);
9260                 Component.this.addFocusListener(accessibleAWTFocusHandler);
9261             }
9262             super.addPropertyChangeListener(listener);
9263         }
9264 
9265         /**
9266          * Remove a PropertyChangeListener from the listener list.
9267          * This removes a PropertyChangeListener that was registered
9268          * for all properties.
9269          *
9270          * @param listener  The PropertyChangeListener to be removed
9271          */
9272         public void removePropertyChangeListener(PropertyChangeListener listener) {
9273             if (--propertyListenersCount == 0) {
9274                 Component.this.removeComponentListener(accessibleAWTComponentHandler);
9275                 Component.this.removeFocusListener(accessibleAWTFocusHandler);
9276             }
9277             super.removePropertyChangeListener(listener);
9278         }
9279 
9280         // AccessibleContext methods
9281         //
9282         /**
9283          * Gets the accessible name of this object.  This should almost never
9284          * return <code>java.awt.Component.getName()</code>,
9285          * as that generally isn't a localized name,
9286          * and doesn't have meaning for the user.  If the
9287          * object is fundamentally a text object (e.g. a menu item), the
9288          * accessible name should be the text of the object (e.g. "save").
9289          * If the object has a tooltip, the tooltip text may also be an
9290          * appropriate String to return.
9291          *
9292          * @return the localized name of the object -- can be
9293          *         <code>null</code> if this
9294          *         object does not have a name
9295          * @see javax.accessibility.AccessibleContext#setAccessibleName
9296          */
9297         public String getAccessibleName() {
9298             return accessibleName;
9299         }
9300 
9301         /**
9302          * Gets the accessible description of this object.  This should be
9303          * a concise, localized description of what this object is - what
9304          * is its meaning to the user.  If the object has a tooltip, the
9305          * tooltip text may be an appropriate string to return, assuming
9306          * it contains a concise description of the object (instead of just
9307          * the name of the object - e.g. a "Save" icon on a toolbar that
9308          * had "save" as the tooltip text shouldn't return the tooltip
9309          * text as the description, but something like "Saves the current
9310          * text document" instead).
9311          *
9312          * @return the localized description of the object -- can be
9313          *        <code>null</code> if this object does not have a description
9314          * @see javax.accessibility.AccessibleContext#setAccessibleDescription
9315          */
9316         public String getAccessibleDescription() {
9317             return accessibleDescription;
9318         }
9319 
9320         /**
9321          * Gets the role of this object.
9322          *
9323          * @return an instance of <code>AccessibleRole</code>
9324          *      describing the role of the object
9325          * @see javax.accessibility.AccessibleRole
9326          */
9327         public AccessibleRole getAccessibleRole() {
9328             return AccessibleRole.AWT_COMPONENT;
9329         }
9330 
9331         /**
9332          * Gets the state of this object.
9333          *
9334          * @return an instance of <code>AccessibleStateSet</code>
9335          *       containing the current state set of the object
9336          * @see javax.accessibility.AccessibleState
9337          */
9338         public AccessibleStateSet getAccessibleStateSet() {
9339             return Component.this.getAccessibleStateSet();
9340         }
9341 
9342         /**
9343          * Gets the <code>Accessible</code> parent of this object.
9344          * If the parent of this object implements <code>Accessible</code>,
9345          * this method should simply return <code>getParent</code>.
9346          *
9347          * @return the <code>Accessible</code> parent of this
9348          *      object -- can be <code>null</code> if this
9349          *      object does not have an <code>Accessible</code> parent
9350          */
9351         public Accessible getAccessibleParent() {
9352             if (accessibleParent != null) {
9353                 return accessibleParent;
9354             } else {
9355                 Container parent = getParent();
9356                 if (parent instanceof Accessible) {
9357                     return (Accessible) parent;
9358                 }
9359             }
9360             return null;
9361         }
9362 
9363         /**
9364          * Gets the index of this object in its accessible parent.
9365          *
9366          * @return the index of this object in its parent; or -1 if this
9367          *    object does not have an accessible parent
9368          * @see #getAccessibleParent
9369          */
9370         public int getAccessibleIndexInParent() {
9371             return Component.this.getAccessibleIndexInParent();
9372         }
9373 
9374         /**
9375          * Returns the number of accessible children in the object.  If all
9376          * of the children of this object implement <code>Accessible</code>,
9377          * then this method should return the number of children of this object.
9378          *
9379          * @return the number of accessible children in the object
9380          */
9381         public int getAccessibleChildrenCount() {
9382             return 0; // Components don't have children
9383         }
9384 
9385         /**
9386          * Returns the nth <code>Accessible</code> child of the object.
9387          *
9388          * @param i zero-based index of child
9389          * @return the nth <code>Accessible</code> child of the object
9390          */
9391         public Accessible getAccessibleChild(int i) {
9392             return null; // Components don't have children
9393         }
9394 
9395         /**
9396          * Returns the locale of this object.
9397          *
9398          * @return the locale of this object
9399          */
9400         public Locale getLocale() {
9401             return Component.this.getLocale();
9402         }
9403 
9404         /**
9405          * Gets the <code>AccessibleComponent</code> associated
9406          * with this object if one exists.
9407          * Otherwise return <code>null</code>.
9408          *
9409          * @return the component
9410          */
9411         public AccessibleComponent getAccessibleComponent() {
9412             return this;
9413         }
9414 
9415 
9416         // AccessibleComponent methods
9417         //
9418         /**
9419          * Gets the background color of this object.
9420          *
9421          * @return the background color, if supported, of the object;
9422          *      otherwise, <code>null</code>
9423          */
9424         public Color getBackground() {
9425             return Component.this.getBackground();
9426         }
9427 
9428         /**
9429          * Sets the background color of this object.
9430          * (For transparency, see <code>isOpaque</code>.)
9431          *
9432          * @param c the new <code>Color</code> for the background
9433          * @see Component#isOpaque
9434          */
9435         public void setBackground(Color c) {
9436             Component.this.setBackground(c);
9437         }
9438 
9439         /**
9440          * Gets the foreground color of this object.
9441          *
9442          * @return the foreground color, if supported, of the object;
9443          *     otherwise, <code>null</code>
9444          */
9445         public Color getForeground() {
9446             return Component.this.getForeground();
9447         }
9448 
9449         /**
9450          * Sets the foreground color of this object.
9451          *
9452          * @param c the new <code>Color</code> for the foreground
9453          */
9454         public void setForeground(Color c) {
9455             Component.this.setForeground(c);
9456         }
9457 
9458         /**
9459          * Gets the <code>Cursor</code> of this object.
9460          *
9461          * @return the <code>Cursor</code>, if supported,
9462          *     of the object; otherwise, <code>null</code>
9463          */
9464         public Cursor getCursor() {
9465             return Component.this.getCursor();
9466         }
9467 
9468         /**
9469          * Sets the <code>Cursor</code> of this object.
9470          * <p>
9471          * The method may have no visual effect if the Java platform
9472          * implementation and/or the native system do not support
9473          * changing the mouse cursor shape.
9474          * @param cursor the new <code>Cursor</code> for the object
9475          */
9476         public void setCursor(Cursor cursor) {
9477             Component.this.setCursor(cursor);
9478         }
9479 
9480         /**
9481          * Gets the <code>Font</code> of this object.
9482          *
9483          * @return the <code>Font</code>, if supported,
9484          *    for the object; otherwise, <code>null</code>
9485          */
9486         public Font getFont() {
9487             return Component.this.getFont();
9488         }
9489 
9490         /**
9491          * Sets the <code>Font</code> of this object.
9492          *
9493          * @param f the new <code>Font</code> for the object
9494          */
9495         public void setFont(Font f) {
9496             Component.this.setFont(f);
9497         }
9498 
9499         /**
9500          * Gets the <code>FontMetrics</code> of this object.
9501          *
9502          * @param f the <code>Font</code>
9503          * @return the <code>FontMetrics</code>, if supported,
9504          *     the object; otherwise, <code>null</code>
9505          * @see #getFont
9506          */
9507         public FontMetrics getFontMetrics(Font f) {
9508             if (f == null) {
9509                 return null;
9510             } else {
9511                 return Component.this.getFontMetrics(f);
9512             }
9513         }
9514 
9515         /**
9516          * Determines if the object is enabled.
9517          *
9518          * @return true if object is enabled; otherwise, false
9519          */
9520         public boolean isEnabled() {
9521             return Component.this.isEnabled();
9522         }
9523 
9524         /**
9525          * Sets the enabled state of the object.
9526          *
9527          * @param b if true, enables this object; otherwise, disables it
9528          */
9529         public void setEnabled(boolean b) {
9530             boolean old = Component.this.isEnabled();
9531             Component.this.setEnabled(b);
9532             if (b != old) {
9533                 if (accessibleContext != null) {
9534                     if (b) {
9535                         accessibleContext.firePropertyChange(
9536                                                              AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
9537                                                              null, AccessibleState.ENABLED);
9538                     } else {
9539                         accessibleContext.firePropertyChange(
9540                                                              AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
9541                                                              AccessibleState.ENABLED, null);
9542                     }
9543                 }
9544             }
9545         }
9546 
9547         /**
9548          * Determines if the object is visible.  Note: this means that the
9549          * object intends to be visible; however, it may not in fact be
9550          * showing on the screen because one of the objects that this object
9551          * is contained by is not visible.  To determine if an object is
9552          * showing on the screen, use <code>isShowing</code>.
9553          *
9554          * @return true if object is visible; otherwise, false
9555          */
9556         public boolean isVisible() {
9557             return Component.this.isVisible();
9558         }
9559 
9560         /**
9561          * Sets the visible state of the object.
9562          *
9563          * @param b if true, shows this object; otherwise, hides it
9564          */
9565         public void setVisible(boolean b) {
9566             boolean old = Component.this.isVisible();
9567             Component.this.setVisible(b);
9568             if (b != old) {
9569                 if (accessibleContext != null) {
9570                     if (b) {
9571                         accessibleContext.firePropertyChange(
9572                                                              AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
9573                                                              null, AccessibleState.VISIBLE);
9574                     } else {
9575                         accessibleContext.firePropertyChange(
9576                                                              AccessibleContext.ACCESSIBLE_STATE_PROPERTY,
9577                                                              AccessibleState.VISIBLE, null);
9578                     }
9579                 }
9580             }
9581         }
9582 
9583         /**
9584          * Determines if the object is showing.  This is determined by checking
9585          * the visibility of the object and ancestors of the object.  Note:
9586          * this will return true even if the object is obscured by another
9587          * (for example, it happens to be underneath a menu that was pulled
9588          * down).
9589          *
9590          * @return true if object is showing; otherwise, false
9591          */
9592         public boolean isShowing() {
9593             return Component.this.isShowing();
9594         }
9595 
9596         /**
9597          * Checks whether the specified point is within this object's bounds,
9598          * where the point's x and y coordinates are defined to be relative to
9599          * the coordinate system of the object.
9600          *
9601          * @param p the <code>Point</code> relative to the
9602          *     coordinate system of the object
9603          * @return true if object contains <code>Point</code>; otherwise false
9604          */
9605         public boolean contains(Point p) {
9606             return Component.this.contains(p);
9607         }
9608 
9609         /**
9610          * Returns the location of the object on the screen.
9611          *
9612          * @return location of object on screen -- can be
9613          *    <code>null</code> if this object is not on the screen
9614          */
9615         public Point getLocationOnScreen() {
9616             synchronized (Component.this.getTreeLock()) {
9617                 if (Component.this.isShowing()) {
9618                     return Component.this.getLocationOnScreen();
9619                 } else {
9620                     return null;
9621                 }
9622             }
9623         }
9624 
9625         /**
9626          * Gets the location of the object relative to the parent in the form
9627          * of a point specifying the object's top-left corner in the screen's
9628          * coordinate space.
9629          *
9630          * @return an instance of Point representing the top-left corner of
9631          * the object's bounds in the coordinate space of the screen;
9632          * <code>null</code> if this object or its parent are not on the screen
9633          */
9634         public Point getLocation() {
9635             return Component.this.getLocation();
9636         }
9637 
9638         /**
9639          * Sets the location of the object relative to the parent.
9640          * @param p  the coordinates of the object
9641          */
9642         public void setLocation(Point p) {
9643             Component.this.setLocation(p);
9644         }
9645 
9646         /**
9647          * Gets the bounds of this object in the form of a Rectangle object.
9648          * The bounds specify this object's width, height, and location
9649          * relative to its parent.
9650          *
9651          * @return a rectangle indicating this component's bounds;
9652          *   <code>null</code> if this object is not on the screen
9653          */
9654         public Rectangle getBounds() {
9655             return Component.this.getBounds();
9656         }
9657 
9658         /**
9659          * Sets the bounds of this object in the form of a
9660          * <code>Rectangle</code> object.
9661          * The bounds specify this object's width, height, and location
9662          * relative to its parent.
9663          *
9664          * @param r a rectangle indicating this component's bounds
9665          */
9666         public void setBounds(Rectangle r) {
9667             Component.this.setBounds(r);
9668         }
9669 
9670         /**
9671          * Returns the size of this object in the form of a
9672          * <code>Dimension</code> object. The height field of the
9673          * <code>Dimension</code> object contains this object's
9674          * height, and the width field of the <code>Dimension</code>
9675          * object contains this object's width.
9676          *
9677          * @return a <code>Dimension</code> object that indicates
9678          *     the size of this component; <code>null</code> if
9679          *     this object is not on the screen
9680          */
9681         public Dimension getSize() {
9682             return Component.this.getSize();
9683         }
9684 
9685         /**
9686          * Resizes this object so that it has width and height.
9687          *
9688          * @param d - the dimension specifying the new size of the object
9689          */
9690         public void setSize(Dimension d) {
9691             Component.this.setSize(d);
9692         }
9693 
9694         /**
9695          * Returns the <code>Accessible</code> child,
9696          * if one exists, contained at the local
9697          * coordinate <code>Point</code>.  Otherwise returns
9698          * <code>null</code>.
9699          *
9700          * @param p the point defining the top-left corner of
9701          *      the <code>Accessible</code>, given in the
9702          *      coordinate space of the object's parent
9703          * @return the <code>Accessible</code>, if it exists,
9704          *      at the specified location; else <code>null</code>
9705          */
9706         public Accessible getAccessibleAt(Point p) {
9707             return null; // Components don't have children
9708         }
9709 
9710         /**
9711          * Returns whether this object can accept focus or not.
9712          *
9713          * @return true if object can accept focus; otherwise false
9714          */
9715         public boolean isFocusTraversable() {
9716             return Component.this.isFocusTraversable();
9717         }
9718 
9719         /**
9720          * Requests focus for this object.
9721          */
9722         public void requestFocus() {
9723             Component.this.requestFocus();
9724         }
9725 
9726         /**
9727          * Adds the specified focus listener to receive focus events from this
9728          * component.
9729          *
9730          * @param l the focus listener
9731          */
9732         public void addFocusListener(FocusListener l) {
9733             Component.this.addFocusListener(l);
9734         }
9735 
9736         /**
9737          * Removes the specified focus listener so it no longer receives focus
9738          * events from this component.
9739          *
9740          * @param l the focus listener
9741          */
9742         public void removeFocusListener(FocusListener l) {
9743             Component.this.removeFocusListener(l);
9744         }
9745 
9746     } // inner class AccessibleAWTComponent
9747 
9748 
9749     /**
9750      * Gets the index of this object in its accessible parent.
9751      * If this object does not have an accessible parent, returns
9752      * -1.
9753      *
9754      * @return the index of this object in its accessible parent
9755      */
9756     int getAccessibleIndexInParent() {
9757         synchronized (getTreeLock()) {
9758             int index = -1;
9759             Container parent = this.getParent();
9760             if (parent != null && parent instanceof Accessible) {
9761                 Component ca[] = parent.getComponents();
9762                 for (int i = 0; i < ca.length; i++) {
9763                     if (ca[i] instanceof Accessible) {
9764                         index++;
9765                     }
9766                     if (this.equals(ca[i])) {
9767                         return index;
9768                     }
9769                 }
9770             }
9771             return -1;
9772         }
9773     }
9774 
9775     /**
9776      * Gets the current state set of this object.
9777      *
9778      * @return an instance of <code>AccessibleStateSet</code>
9779      *    containing the current state set of the object
9780      * @see AccessibleState
9781      */
9782     AccessibleStateSet getAccessibleStateSet() {
9783         synchronized (getTreeLock()) {
9784             AccessibleStateSet states = new AccessibleStateSet();
9785             if (this.isEnabled()) {
9786                 states.add(AccessibleState.ENABLED);
9787             }
9788             if (this.isFocusTraversable()) {
9789                 states.add(AccessibleState.FOCUSABLE);
9790             }
9791             if (this.isVisible()) {
9792                 states.add(AccessibleState.VISIBLE);
9793             }
9794             if (this.isShowing()) {
9795                 states.add(AccessibleState.SHOWING);
9796             }
9797             if (this.isFocusOwner()) {
9798                 states.add(AccessibleState.FOCUSED);
9799             }
9800             if (this instanceof Accessible) {
9801                 AccessibleContext ac = ((Accessible) this).getAccessibleContext();
9802                 if (ac != null) {
9803                     Accessible ap = ac.getAccessibleParent();
9804                     if (ap != null) {
9805                         AccessibleContext pac = ap.getAccessibleContext();
9806                         if (pac != null) {
9807                             AccessibleSelection as = pac.getAccessibleSelection();
9808                             if (as != null) {
9809                                 states.add(AccessibleState.SELECTABLE);
9810                                 int i = ac.getAccessibleIndexInParent();
9811                                 if (i >= 0) {
9812                                     if (as.isAccessibleChildSelected(i)) {
9813                                         states.add(AccessibleState.SELECTED);
9814                                     }
9815                                 }
9816                             }
9817                         }
9818                     }
9819                 }
9820             }
9821             if (Component.isInstanceOf(this, "javax.swing.JComponent")) {
9822                 if (((javax.swing.JComponent) this).isOpaque()) {
9823                     states.add(AccessibleState.OPAQUE);
9824                 }
9825             }
9826             return states;
9827         }
9828     }
9829 
9830     /**
9831      * Checks that the given object is instance of the given class.
9832      * @param obj Object to be checked
9833      * @param className The name of the class. Must be fully-qualified class name.
9834      * @return true, if this object is instanceof given class,
9835      *         false, otherwise, or if obj or className is null
9836      */
9837     static boolean isInstanceOf(Object obj, String className) {
9838         if (obj == null) return false;
9839         if (className == null) return false;
9840 
9841         Class<?> cls = obj.getClass();
9842         while (cls != null) {
9843             if (cls.getName().equals(className)) {
9844                 return true;
9845             }
9846             cls = cls.getSuperclass();
9847         }
9848         return false;
9849     }
9850 
9851 
9852     // ************************** MIXING CODE *******************************
9853 
9854     /**
9855      * Check whether we can trust the current bounds of the component.
9856      * The return value of false indicates that the container of the
9857      * component is invalid, and therefore needs to be laid out, which would
9858      * probably mean changing the bounds of its children.
9859      * Null-layout of the container or absence of the container mean
9860      * the bounds of the component are final and can be trusted.
9861      */
9862     final boolean areBoundsValid() {
9863         Container cont = getContainer();
9864         return cont == null || cont.isValid() || cont.getLayout() == null;
9865     }
9866 
9867     /**
9868      * Applies the shape to the component
9869      * @param shape Shape to be applied to the component
9870      */
9871     void applyCompoundShape(Region shape) {
9872         checkTreeLock();
9873 
9874         if (!areBoundsValid()) {
9875             if (mixingLog.isLoggable(PlatformLogger.Level.FINE)) {
9876                 mixingLog.fine("this = " + this + "; areBoundsValid = " + areBoundsValid());
9877             }
9878             return;
9879         }
9880 
9881         if (!isLightweight()) {
9882             ComponentPeer peer = this.peer;
9883             if (peer != null) {
9884                 // The Region class has some optimizations. That's why
9885                 // we should manually check whether it's empty and
9886                 // substitute the object ourselves. Otherwise we end up
9887                 // with some incorrect Region object with loX being
9888                 // greater than the hiX for instance.
9889                 if (shape.isEmpty()) {
9890                     shape = Region.EMPTY_REGION;
9891                 }
9892 
9893 
9894                 // Note: the shape is not really copied/cloned. We create
9895                 // the Region object ourselves, so there's no any possibility
9896                 // to modify the object outside of the mixing code.
9897                 // Nullifying compoundShape means that the component has normal shape
9898                 // (or has no shape at all).
9899                 if (shape.equals(getNormalShape())) {
9900                     if (this.compoundShape == null) {
9901                         return;
9902                     }
9903                     this.compoundShape = null;
9904                     peer.applyShape(null);
9905                 } else {
9906                     if (shape.equals(getAppliedShape())) {
9907                         return;
9908                     }
9909                     this.compoundShape = shape;
9910                     Point compAbsolute = getLocationOnWindow();
9911                     if (mixingLog.isLoggable(PlatformLogger.Level.FINER)) {
9912                         mixingLog.fine("this = " + this +
9913                                 "; compAbsolute=" + compAbsolute + "; shape=" + shape);
9914                     }
9915                     peer.applyShape(shape.getTranslatedRegion(-compAbsolute.x, -compAbsolute.y));
9916                 }
9917             }
9918         }
9919     }
9920 
9921     /**
9922      * Returns the shape previously set with applyCompoundShape().
9923      * If the component is LW or no shape was applied yet,
9924      * the method returns the normal shape.
9925      */
9926     private Region getAppliedShape() {
9927         checkTreeLock();
9928         //XXX: if we allow LW components to have a shape, this must be changed
9929         return (this.compoundShape == null || isLightweight()) ? getNormalShape() : this.compoundShape;
9930     }
9931 
9932     Point getLocationOnWindow() {
9933         checkTreeLock();
9934         Point curLocation = getLocation();
9935 
9936         for (Container parent = getContainer();
9937                 parent != null && !(parent instanceof Window);
9938                 parent = parent.getContainer())
9939         {
9940             curLocation.x += parent.getX();
9941             curLocation.y += parent.getY();
9942         }
9943 
9944         return curLocation;
9945     }
9946 
9947     /**
9948      * Returns the full shape of the component located in window coordinates
9949      */
9950     final Region getNormalShape() {
9951         checkTreeLock();
9952         //XXX: we may take into account a user-specified shape for this component
9953         Point compAbsolute = getLocationOnWindow();
9954         return
9955             Region.getInstanceXYWH(
9956                     compAbsolute.x,
9957                     compAbsolute.y,
9958                     getWidth(),
9959                     getHeight()
9960             );
9961     }
9962 
9963     /**
9964      * Returns the "opaque shape" of the component.
9965      *
9966      * The opaque shape of a lightweight components is the actual shape that
9967      * needs to be cut off of the heavyweight components in order to mix this
9968      * lightweight component correctly with them.
9969      *
9970      * The method is overriden in the java.awt.Container to handle non-opaque
9971      * containers containing opaque children.
9972      *
9973      * See 6637655 for details.
9974      */
9975     Region getOpaqueShape() {
9976         checkTreeLock();
9977         if (mixingCutoutRegion != null) {
9978             return mixingCutoutRegion;
9979         } else {
9980             return getNormalShape();
9981         }
9982     }
9983 
9984     final int getSiblingIndexAbove() {
9985         checkTreeLock();
9986         Container parent = getContainer();
9987         if (parent == null) {
9988             return -1;
9989         }
9990 
9991         int nextAbove = parent.getComponentZOrder(this) - 1;
9992 
9993         return nextAbove < 0 ? -1 : nextAbove;
9994     }
9995 
9996     final ComponentPeer getHWPeerAboveMe() {
9997         checkTreeLock();
9998 
9999         Container cont = getContainer();
10000         int indexAbove = getSiblingIndexAbove();
10001 
10002         while (cont != null) {
10003             for (int i = indexAbove; i > -1; i--) {
10004                 Component comp = cont.getComponent(i);
10005                 if (comp != null && comp.isDisplayable() && !comp.isLightweight()) {
10006                     return comp.peer;
10007                 }
10008             }
10009             // traversing the hierarchy up to the closest HW container;
10010             // further traversing may return a component that is not actually
10011             // a native sibling of this component and this kind of z-order
10012             // request may not be allowed by the underlying system (6852051).
10013             if (!cont.isLightweight()) {
10014                 break;
10015             }
10016 
10017             indexAbove = cont.getSiblingIndexAbove();
10018             cont = cont.getContainer();
10019         }
10020 
10021         return null;
10022     }
10023 
10024     final int getSiblingIndexBelow() {
10025         checkTreeLock();
10026         Container parent = getContainer();
10027         if (parent == null) {
10028             return -1;
10029         }
10030 
10031         int nextBelow = parent.getComponentZOrder(this) + 1;
10032 
10033         return nextBelow >= parent.getComponentCount() ? -1 : nextBelow;
10034     }
10035 
10036     final boolean isNonOpaqueForMixing() {
10037         return mixingCutoutRegion != null &&
10038             mixingCutoutRegion.isEmpty();
10039     }
10040 
10041     private Region calculateCurrentShape() {
10042         checkTreeLock();
10043         Region s = getNormalShape();
10044 
10045         if (mixingLog.isLoggable(PlatformLogger.Level.FINE)) {
10046             mixingLog.fine("this = " + this + "; normalShape=" + s);
10047         }
10048 
10049         if (getContainer() != null) {
10050             Component comp = this;
10051             Container cont = comp.getContainer();
10052 
10053             while (cont != null) {
10054                 for (int index = comp.getSiblingIndexAbove(); index != -1; --index) {
10055                     /* It is assumed that:
10056                      *
10057                      *    getComponent(getContainer().getComponentZOrder(comp)) == comp
10058                      *
10059                      * The assumption has been made according to the current
10060                      * implementation of the Container class.
10061                      */
10062                     Component c = cont.getComponent(index);
10063                     if (c.isLightweight() && c.isShowing()) {
10064                         s = s.getDifference(c.getOpaqueShape());
10065                     }
10066                 }
10067 
10068                 if (cont.isLightweight()) {
10069                     s = s.getIntersection(cont.getNormalShape());
10070                 } else {
10071                     break;
10072                 }
10073 
10074                 comp = cont;
10075                 cont = cont.getContainer();
10076             }
10077         }
10078 
10079         if (mixingLog.isLoggable(PlatformLogger.Level.FINE)) {
10080             mixingLog.fine("currentShape=" + s);
10081         }
10082 
10083         return s;
10084     }
10085 
10086     void applyCurrentShape() {
10087         checkTreeLock();
10088         if (!areBoundsValid()) {
10089             if (mixingLog.isLoggable(PlatformLogger.Level.FINE)) {
10090                 mixingLog.fine("this = " + this + "; areBoundsValid = " + areBoundsValid());
10091             }
10092             return; // Because applyCompoundShape() ignores such components anyway
10093         }
10094         if (mixingLog.isLoggable(PlatformLogger.Level.FINE)) {
10095             mixingLog.fine("this = " + this);
10096         }
10097         applyCompoundShape(calculateCurrentShape());
10098     }
10099 
10100     final void subtractAndApplyShape(Region s) {
10101         checkTreeLock();
10102 
10103         if (mixingLog.isLoggable(PlatformLogger.Level.FINE)) {
10104             mixingLog.fine("this = " + this + "; s=" + s);
10105         }
10106 
10107         applyCompoundShape(getAppliedShape().getDifference(s));
10108     }
10109 
10110     private final void applyCurrentShapeBelowMe() {
10111         checkTreeLock();
10112         Container parent = getContainer();
10113         if (parent != null && parent.isShowing()) {
10114             // First, reapply shapes of my siblings
10115             parent.recursiveApplyCurrentShape(getSiblingIndexBelow());
10116 
10117             // Second, if my container is non-opaque, reapply shapes of siblings of my container
10118             Container parent2 = parent.getContainer();
10119             while (!parent.isOpaque() && parent2 != null) {
10120                 parent2.recursiveApplyCurrentShape(parent.getSiblingIndexBelow());
10121 
10122                 parent = parent2;
10123                 parent2 = parent.getContainer();
10124             }
10125         }
10126     }
10127 
10128     final void subtractAndApplyShapeBelowMe() {
10129         checkTreeLock();
10130         Container parent = getContainer();
10131         if (parent != null && isShowing()) {
10132             Region opaqueShape = getOpaqueShape();
10133 
10134             // First, cut my siblings
10135             parent.recursiveSubtractAndApplyShape(opaqueShape, getSiblingIndexBelow());
10136 
10137             // Second, if my container is non-opaque, cut siblings of my container
10138             Container parent2 = parent.getContainer();
10139             while (!parent.isOpaque() && parent2 != null) {
10140                 parent2.recursiveSubtractAndApplyShape(opaqueShape, parent.getSiblingIndexBelow());
10141 
10142                 parent = parent2;
10143                 parent2 = parent.getContainer();
10144             }
10145         }
10146     }
10147 
10148     void mixOnShowing() {
10149         synchronized (getTreeLock()) {
10150             if (mixingLog.isLoggable(PlatformLogger.Level.FINE)) {
10151                 mixingLog.fine("this = " + this);
10152             }
10153             if (!isMixingNeeded()) {
10154                 return;
10155             }
10156             if (isLightweight()) {
10157                 subtractAndApplyShapeBelowMe();
10158             } else {
10159                 applyCurrentShape();
10160             }
10161         }
10162     }
10163 
10164     void mixOnHiding(boolean isLightweight) {
10165         // We cannot be sure that the peer exists at this point, so we need the argument
10166         //    to find out whether the hiding component is (well, actually was) a LW or a HW.
10167         synchronized (getTreeLock()) {
10168             if (mixingLog.isLoggable(PlatformLogger.Level.FINE)) {
10169                 mixingLog.fine("this = " + this + "; isLightweight = " + isLightweight);
10170             }
10171             if (!isMixingNeeded()) {
10172                 return;
10173             }
10174             if (isLightweight) {
10175                 applyCurrentShapeBelowMe();
10176             }
10177         }
10178     }
10179 
10180     void mixOnReshaping() {
10181         synchronized (getTreeLock()) {
10182             if (mixingLog.isLoggable(PlatformLogger.Level.FINE)) {
10183                 mixingLog.fine("this = " + this);
10184             }
10185             if (!isMixingNeeded()) {
10186                 return;
10187             }
10188             if (isLightweight()) {
10189                 applyCurrentShapeBelowMe();
10190             } else {
10191                 applyCurrentShape();
10192             }
10193         }
10194     }
10195 
10196     void mixOnZOrderChanging(int oldZorder, int newZorder) {
10197         synchronized (getTreeLock()) {
10198             boolean becameHigher = newZorder < oldZorder;
10199             Container parent = getContainer();
10200 
10201             if (mixingLog.isLoggable(PlatformLogger.Level.FINE)) {
10202                 mixingLog.fine("this = " + this +
10203                     "; oldZorder=" + oldZorder + "; newZorder=" + newZorder + "; parent=" + parent);
10204             }
10205             if (!isMixingNeeded()) {
10206                 return;
10207             }
10208             if (isLightweight()) {
10209                 if (becameHigher) {
10210                     if (parent != null && isShowing()) {
10211                         parent.recursiveSubtractAndApplyShape(getOpaqueShape(), getSiblingIndexBelow(), oldZorder);
10212                     }
10213                 } else {
10214                     if (parent != null) {
10215                         parent.recursiveApplyCurrentShape(oldZorder, newZorder);
10216                     }
10217                 }
10218             } else {
10219                 if (becameHigher) {
10220                     applyCurrentShape();
10221                 } else {
10222                     if (parent != null) {
10223                         Region shape = getAppliedShape();
10224 
10225                         for (int index = oldZorder; index < newZorder; index++) {
10226                             Component c = parent.getComponent(index);
10227                             if (c.isLightweight() && c.isShowing()) {
10228                                 shape = shape.getDifference(c.getOpaqueShape());
10229                             }
10230                         }
10231                         applyCompoundShape(shape);
10232                     }
10233                 }
10234             }
10235         }
10236     }
10237 
10238     void mixOnValidating() {
10239         // This method gets overriden in the Container. Obviously, a plain
10240         // non-container components don't need to handle validation.
10241     }
10242 
10243     final boolean isMixingNeeded() {
10244         if (SunToolkit.getSunAwtDisableMixing()) {
10245             if (mixingLog.isLoggable(PlatformLogger.Level.FINEST)) {
10246                 mixingLog.finest("this = " + this + "; Mixing disabled via sun.awt.disableMixing");
10247             }
10248             return false;
10249         }
10250         if (!areBoundsValid()) {
10251             if (mixingLog.isLoggable(PlatformLogger.Level.FINE)) {
10252                 mixingLog.fine("this = " + this + "; areBoundsValid = " + areBoundsValid());
10253             }
10254             return false;
10255         }
10256         Window window = getContainingWindow();
10257         if (window != null) {
10258             if (!window.hasHeavyweightDescendants() || !window.hasLightweightDescendants() || window.isDisposing()) {
10259                 if (mixingLog.isLoggable(PlatformLogger.Level.FINE)) {
10260                     mixingLog.fine("containing window = " + window +
10261                             "; has h/w descendants = " + window.hasHeavyweightDescendants() +
10262                             "; has l/w descendants = " + window.hasLightweightDescendants() +
10263                             "; disposing = " + window.isDisposing());
10264                 }
10265                 return false;
10266             }
10267         } else {
10268             if (mixingLog.isLoggable(PlatformLogger.Level.FINE)) {
10269                 mixingLog.fine("this = " + this + "; containing window is null");
10270             }
10271             return false;
10272         }
10273         return true;
10274     }
10275 
10276     // ****************** END OF MIXING CODE ********************************
10277 
10278     // Note that the method is overriden in the Window class,
10279     // a window doesn't need to be updated in the Z-order.
10280     void updateZOrder() {
10281         peer.setZOrder(getHWPeerAboveMe());
10282     }
10283 
10284 }