1 /*
   2  * Copyright (c) 1997, 2013, 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 javax.swing;
  26 
  27 import java.awt.*;
  28 import java.awt.event.*;
  29 import java.beans.PropertyChangeListener;
  30 import java.util.Locale;
  31 import java.util.Vector;
  32 import java.io.Serializable;
  33 
  34 import javax.accessibility.*;
  35 
  36 /**
  37  * A <code>JWindow</code> is a container that can be displayed anywhere on the
  38  * user's desktop. It does not have the title bar, window-management buttons,
  39  * or other trimmings associated with a <code>JFrame</code>, but it is still a
  40  * "first-class citizen" of the user's desktop, and can exist anywhere
  41  * on it.
  42  * <p>
  43  * The <code>JWindow</code> component contains a <code>JRootPane</code>
  44  * as its only child.  The <code>contentPane</code> should be the parent
  45  * of any children of the <code>JWindow</code>.
  46  * As a convenience, the {@code add}, {@code remove}, and {@code setLayout}
  47  * methods of this class are overridden, so that they delegate calls
  48  * to the corresponding methods of the {@code ContentPane}.
  49  * For example, you can add a child component to a window as follows:
  50  * <pre>
  51  *       window.add(child);
  52  * </pre>
  53  * And the child will be added to the contentPane.
  54  * The <code>contentPane</code> will always be non-<code>null</code>.
  55  * Attempting to set it to <code>null</code> will cause the <code>JWindow</code>
  56  * to throw an exception. The default <code>contentPane</code> will have a
  57  * <code>BorderLayout</code> manager set on it.
  58  * Refer to {@link javax.swing.RootPaneContainer}
  59  * for details on adding, removing and setting the <code>LayoutManager</code>
  60  * of a <code>JWindow</code>.
  61  * <p>
  62  * Please see the {@link JRootPane} documentation for a complete description of
  63  * the <code>contentPane</code>, <code>glassPane</code>, and
  64  * <code>layeredPane</code> components.
  65  * <p>
  66  * In a multi-screen environment, you can create a <code>JWindow</code>
  67  * on a different screen device.  See {@link java.awt.Window} for more
  68  * information.
  69  * <p>
  70  * <strong>Warning:</strong> Swing is not thread safe. For more
  71  * information see <a
  72  * href="package-summary.html#threading">Swing's Threading
  73  * Policy</a>.
  74  * <p>
  75  * <strong>Warning:</strong>
  76  * Serialized objects of this class will not be compatible with
  77  * future Swing releases. The current serialization support is
  78  * appropriate for short term storage or RMI between applications running
  79  * the same version of Swing.  As of 1.4, support for long term storage
  80  * of all JavaBeans&trade;
  81  * has been added to the <code>java.beans</code> package.
  82  * Please see {@link java.beans.XMLEncoder}.
  83  *
  84  * @see JRootPane
  85  *
  86  * @beaninfo
  87  *      attribute: isContainer true
  88  *      attribute: containerDelegate getContentPane
  89  *    description: A toplevel window which has no system border or controls.
  90  *
  91  * @author David Kloba
  92  * @since 1.2
  93  */
  94 @SuppressWarnings("serial")
  95 public class JWindow extends Window implements Accessible,
  96                                                RootPaneContainer,
  97                                TransferHandler.HasGetTransferHandler
  98 {
  99     /**
 100      * The <code>JRootPane</code> instance that manages the
 101      * <code>contentPane</code>
 102      * and optional <code>menuBar</code> for this frame, as well as the
 103      * <code>glassPane</code>.
 104      *
 105      * @see #getRootPane
 106      * @see #setRootPane
 107      */
 108     protected JRootPane rootPane;
 109 
 110     /**
 111      * If true then calls to <code>add</code> and <code>setLayout</code>
 112      * will be forwarded to the <code>contentPane</code>. This is initially
 113      * false, but is set to true when the <code>JWindow</code> is constructed.
 114      *
 115      * @see #isRootPaneCheckingEnabled
 116      * @see #setRootPaneCheckingEnabled
 117      * @see javax.swing.RootPaneContainer
 118      */
 119     protected boolean rootPaneCheckingEnabled = false;
 120 
 121     /**
 122      * The <code>TransferHandler</code> for this window.
 123      */
 124     private TransferHandler transferHandler;
 125 
 126     /**
 127      * Creates a window with no specified owner. This window will not be
 128      * focusable.
 129      * <p>
 130      * This constructor sets the component's locale property to the value
 131      * returned by <code>JComponent.getDefaultLocale</code>.
 132      *
 133      * @throws HeadlessException if
 134      *         <code>GraphicsEnvironment.isHeadless()</code> returns true.
 135      * @see java.awt.GraphicsEnvironment#isHeadless
 136      * @see #isFocusableWindow
 137      * @see JComponent#getDefaultLocale
 138      */
 139     public JWindow() {
 140         this((Frame)null);
 141     }
 142 
 143     /**
 144      * Creates a window with the specified <code>GraphicsConfiguration</code>
 145      * of a screen device. This window will not be focusable.
 146      * <p>
 147      * This constructor sets the component's locale property to the value
 148      * returned by <code>JComponent.getDefaultLocale</code>.
 149      *
 150      * @param gc the <code>GraphicsConfiguration</code> that is used
 151      *          to construct the new window with; if gc is <code>null</code>,
 152      *          the system default <code>GraphicsConfiguration</code>
 153      *          is assumed
 154      * @throws HeadlessException If
 155      *         <code>GraphicsEnvironment.isHeadless()</code> returns true.
 156      * @throws IllegalArgumentException if <code>gc</code> is not from
 157      *         a screen device.
 158      *
 159      * @see java.awt.GraphicsEnvironment#isHeadless
 160      * @see #isFocusableWindow
 161      * @see JComponent#getDefaultLocale
 162      *
 163      * @since  1.3
 164      */
 165     public JWindow(GraphicsConfiguration gc) {
 166         this(null, gc);
 167         super.setFocusableWindowState(false);
 168     }
 169 
 170     /**
 171      * Creates a window with the specified owner frame.
 172      * If <code>owner</code> is <code>null</code>, the shared owner
 173      * will be used and this window will not be focusable. Also,
 174      * this window will not be focusable unless its owner is showing
 175      * on the screen.
 176      * <p>
 177      * This constructor sets the component's locale property to the value
 178      * returned by <code>JComponent.getDefaultLocale</code>.
 179      *
 180      * @param owner the frame from which the window is displayed
 181      * @throws HeadlessException if GraphicsEnvironment.isHeadless()
 182      *            returns true.
 183      * @see java.awt.GraphicsEnvironment#isHeadless
 184      * @see #isFocusableWindow
 185      * @see JComponent#getDefaultLocale
 186      */
 187     public JWindow(Frame owner) {
 188         super(owner == null? SwingUtilities.getSharedOwnerFrame() : owner);
 189         if (owner == null) {
 190             WindowListener ownerShutdownListener =
 191                     SwingUtilities.getSharedOwnerFrameShutdownListener();
 192             addWindowListener(ownerShutdownListener);
 193         }
 194         windowInit();
 195     }
 196 
 197     /**
 198      * Creates a window with the specified owner window. This window
 199      * will not be focusable unless its owner is showing on the screen.
 200      * If <code>owner</code> is <code>null</code>, the shared owner
 201      * will be used and this window will not be focusable.
 202      * <p>
 203      * This constructor sets the component's locale property to the value
 204      * returned by <code>JComponent.getDefaultLocale</code>.
 205      *
 206      * @param owner the window from which the window is displayed
 207      * @throws HeadlessException if
 208      *         <code>GraphicsEnvironment.isHeadless()</code> returns true.
 209      * @see java.awt.GraphicsEnvironment#isHeadless
 210      * @see #isFocusableWindow
 211      * @see JComponent#getDefaultLocale
 212      */
 213     public JWindow(Window owner) {
 214         super(owner == null ? (Window)SwingUtilities.getSharedOwnerFrame() :
 215               owner);
 216         if (owner == null) {
 217             WindowListener ownerShutdownListener =
 218                     SwingUtilities.getSharedOwnerFrameShutdownListener();
 219             addWindowListener(ownerShutdownListener);
 220         }
 221         windowInit();
 222     }
 223 
 224     /**
 225      * Creates a window with the specified owner window and
 226      * <code>GraphicsConfiguration</code> of a screen device. If
 227      * <code>owner</code> is <code>null</code>, the shared owner will be used
 228      * and this window will not be focusable.
 229      * <p>
 230      * This constructor sets the component's locale property to the value
 231      * returned by <code>JComponent.getDefaultLocale</code>.
 232      *
 233      * @param owner the window from which the window is displayed
 234      * @param gc the <code>GraphicsConfiguration</code> that is used
 235      *          to construct the new window with; if gc is <code>null</code>,
 236      *          the system default <code>GraphicsConfiguration</code>
 237      *          is assumed, unless <code>owner</code> is also null, in which
 238      *          case the <code>GraphicsConfiguration</code> from the
 239      *          shared owner frame will be used.
 240      * @throws HeadlessException if
 241      *         <code>GraphicsEnvironment.isHeadless()</code> returns true.
 242      * @throws IllegalArgumentException if <code>gc</code> is not from
 243      *         a screen device.
 244      *
 245      * @see java.awt.GraphicsEnvironment#isHeadless
 246      * @see #isFocusableWindow
 247      * @see JComponent#getDefaultLocale
 248      *
 249      * @since  1.3
 250      */
 251     public JWindow(Window owner, GraphicsConfiguration gc) {
 252         super(owner == null ? (Window)SwingUtilities.getSharedOwnerFrame() :
 253               owner, gc);
 254         if (owner == null) {
 255             WindowListener ownerShutdownListener =
 256                     SwingUtilities.getSharedOwnerFrameShutdownListener();
 257             addWindowListener(ownerShutdownListener);
 258         }
 259         windowInit();
 260     }
 261 
 262     /**
 263      * Called by the constructors to init the <code>JWindow</code> properly.
 264      */
 265     protected void windowInit() {
 266         setLocale( JComponent.getDefaultLocale() );
 267         setRootPane(createRootPane());
 268         setRootPaneCheckingEnabled(true);
 269         sun.awt.SunToolkit.checkAndSetPolicy(this);
 270     }
 271 
 272     /**
 273      * Called by the constructor methods to create the default
 274      * <code>rootPane</code>.
 275      *
 276      * @return a new {@code JRootPane}
 277      */
 278     protected JRootPane createRootPane() {
 279         JRootPane rp = new JRootPane();
 280         // NOTE: this uses setOpaque vs LookAndFeel.installProperty as there
 281         // is NO reason for the RootPane not to be opaque. For painting to
 282         // work the contentPane must be opaque, therefor the RootPane can
 283         // also be opaque.
 284         rp.setOpaque(true);
 285         return rp;
 286     }
 287 
 288     /**
 289      * Returns whether calls to <code>add</code> and
 290      * <code>setLayout</code> are forwarded to the <code>contentPane</code>.
 291      *
 292      * @return true if <code>add</code> and <code>setLayout</code>
 293      *         are forwarded; false otherwise
 294      *
 295      * @see #addImpl
 296      * @see #setLayout
 297      * @see #setRootPaneCheckingEnabled
 298      * @see javax.swing.RootPaneContainer
 299      */
 300     protected boolean isRootPaneCheckingEnabled() {
 301         return rootPaneCheckingEnabled;
 302     }
 303 
 304     /**
 305      * Sets the {@code transferHandler} property, which is a mechanism to
 306      * support transfer of data into this component. Use {@code null}
 307      * if the component does not support data transfer operations.
 308      * <p>
 309      * If the system property {@code suppressSwingDropSupport} is {@code false}
 310      * (the default) and the current drop target on this component is either
 311      * {@code null} or not a user-set drop target, this method will change the
 312      * drop target as follows: If {@code newHandler} is {@code null} it will
 313      * clear the drop target. If not {@code null} it will install a new
 314      * {@code DropTarget}.
 315      * <p>
 316      * Note: When used with {@code JWindow}, {@code TransferHandler} only
 317      * provides data import capability, as the data export related methods
 318      * are currently typed to {@code JComponent}.
 319      * <p>
 320      * Please see
 321      * <a href="http://docs.oracle.com/javase/tutorial/uiswing/dnd/index.html">
 322      * How to Use Drag and Drop and Data Transfer</a>, a section in
 323      * <em>The Java Tutorial</em>, for more information.
 324      *
 325      * @param newHandler the new {@code TransferHandler}
 326      *
 327      * @see TransferHandler
 328      * @see #getTransferHandler
 329      * @see java.awt.Component#setDropTarget
 330      * @since 1.6
 331      *
 332      * @beaninfo
 333      *        bound: true
 334      *       hidden: true
 335      *  description: Mechanism for transfer of data into the component
 336      */
 337     public void setTransferHandler(TransferHandler newHandler) {
 338         TransferHandler oldHandler = transferHandler;
 339         transferHandler = newHandler;
 340         SwingUtilities.installSwingDropTargetAsNecessary(this, transferHandler);
 341         firePropertyChange("transferHandler", oldHandler, newHandler);
 342     }
 343 
 344     /**
 345      * Gets the <code>transferHandler</code> property.
 346      *
 347      * @return the value of the <code>transferHandler</code> property
 348      *
 349      * @see TransferHandler
 350      * @see #setTransferHandler
 351      * @since 1.6
 352      */
 353     public TransferHandler getTransferHandler() {
 354         return transferHandler;
 355     }
 356 
 357     /**
 358      * Calls <code>paint(g)</code>.  This method was overridden to
 359      * prevent an unnecessary call to clear the background.
 360      *
 361      * @param g  the <code>Graphics</code> context in which to paint
 362      */
 363     public void update(Graphics g) {
 364         paint(g);
 365     }
 366 
 367     /**
 368      * Sets whether calls to <code>add</code> and
 369      * <code>setLayout</code> are forwarded to the <code>contentPane</code>.
 370      *
 371      * @param enabled  true if <code>add</code> and <code>setLayout</code>
 372      *        are forwarded, false if they should operate directly on the
 373      *        <code>JWindow</code>.
 374      *
 375      * @see #addImpl
 376      * @see #setLayout
 377      * @see #isRootPaneCheckingEnabled
 378      * @see javax.swing.RootPaneContainer
 379      * @beaninfo
 380      *      hidden: true
 381      * description: Whether the add and setLayout methods are forwarded
 382      */
 383     protected void setRootPaneCheckingEnabled(boolean enabled) {
 384         rootPaneCheckingEnabled = enabled;
 385     }
 386 
 387 
 388     /**
 389      * Adds the specified child <code>Component</code>.
 390      * This method is overridden to conditionally forward calls to the
 391      * <code>contentPane</code>.
 392      * By default, children are added to the <code>contentPane</code> instead
 393      * of the frame, refer to {@link javax.swing.RootPaneContainer} for
 394      * details.
 395      *
 396      * @param comp the component to be enhanced
 397      * @param constraints the constraints to be respected
 398      * @param index the index
 399      * @exception IllegalArgumentException if <code>index</code> is invalid
 400      * @exception IllegalArgumentException if adding the container's parent
 401      *                  to itself
 402      * @exception IllegalArgumentException if adding a window to a container
 403      *
 404      * @see #setRootPaneCheckingEnabled
 405      * @see javax.swing.RootPaneContainer
 406      */
 407     protected void addImpl(Component comp, Object constraints, int index)
 408     {
 409         if(isRootPaneCheckingEnabled()) {
 410             getContentPane().add(comp, constraints, index);
 411         }
 412         else {
 413             super.addImpl(comp, constraints, index);
 414         }
 415     }
 416 
 417     /**
 418      * Removes the specified component from the container. If
 419      * <code>comp</code> is not the <code>rootPane</code>, this will forward
 420      * the call to the <code>contentPane</code>. This will do nothing if
 421      * <code>comp</code> is not a child of the <code>JWindow</code> or
 422      * <code>contentPane</code>.
 423      *
 424      * @param comp the component to be removed
 425      * @throws NullPointerException if <code>comp</code> is null
 426      * @see #add
 427      * @see javax.swing.RootPaneContainer
 428      */
 429     public void remove(Component comp) {
 430         if (comp == rootPane) {
 431             super.remove(comp);
 432         } else {
 433             getContentPane().remove(comp);
 434         }
 435     }
 436 
 437 
 438     /**
 439      * Sets the <code>LayoutManager</code>.
 440      * Overridden to conditionally forward the call to the
 441      * <code>contentPane</code>.
 442      * Refer to {@link javax.swing.RootPaneContainer} for
 443      * more information.
 444      *
 445      * @param manager the <code>LayoutManager</code>
 446      * @see #setRootPaneCheckingEnabled
 447      * @see javax.swing.RootPaneContainer
 448      */
 449     public void setLayout(LayoutManager manager) {
 450         if(isRootPaneCheckingEnabled()) {
 451             getContentPane().setLayout(manager);
 452         }
 453         else {
 454             super.setLayout(manager);
 455         }
 456     }
 457 
 458 
 459     /**
 460      * Returns the <code>rootPane</code> object for this window.
 461      * @return the <code>rootPane</code> property for this window
 462      *
 463      * @see #setRootPane
 464      * @see RootPaneContainer#getRootPane
 465      */
 466     public JRootPane getRootPane() {
 467         return rootPane;
 468     }
 469 
 470 
 471     /**
 472      * Sets the new <code>rootPane</code> object for this window.
 473      * This method is called by the constructor.
 474      *
 475      * @param root the new <code>rootPane</code> property
 476      * @see #getRootPane
 477      *
 478      * @beaninfo
 479      *        hidden: true
 480      *   description: the RootPane object for this window.
 481      */
 482     protected void setRootPane(JRootPane root) {
 483         if(rootPane != null) {
 484             remove(rootPane);
 485         }
 486         rootPane = root;
 487         if(rootPane != null) {
 488             boolean checkingEnabled = isRootPaneCheckingEnabled();
 489             try {
 490                 setRootPaneCheckingEnabled(false);
 491                 add(rootPane, BorderLayout.CENTER);
 492             }
 493             finally {
 494                 setRootPaneCheckingEnabled(checkingEnabled);
 495             }
 496         }
 497     }
 498 
 499 
 500     /**
 501      * Returns the <code>Container</code> which is the <code>contentPane</code>
 502      * for this window.
 503      *
 504      * @return the <code>contentPane</code> property
 505      * @see #setContentPane
 506      * @see RootPaneContainer#getContentPane
 507      */
 508     public Container getContentPane() {
 509         return getRootPane().getContentPane();
 510     }
 511 
 512     /**
 513      * Sets the <code>contentPane</code> property for this window.
 514      * This method is called by the constructor.
 515      *
 516      * @param contentPane the new <code>contentPane</code>
 517      *
 518      * @exception IllegalComponentStateException (a runtime
 519      *            exception) if the content pane parameter is <code>null</code>
 520      * @see #getContentPane
 521      * @see RootPaneContainer#setContentPane
 522      *
 523      * @beaninfo
 524      *     hidden: true
 525      *     description: The client area of the window where child
 526      *                  components are normally inserted.
 527      */
 528     public void setContentPane(Container contentPane) {
 529         getRootPane().setContentPane(contentPane);
 530     }
 531 
 532     /**
 533      * Returns the <code>layeredPane</code> object for this window.
 534      *
 535      * @return the <code>layeredPane</code> property
 536      * @see #setLayeredPane
 537      * @see RootPaneContainer#getLayeredPane
 538      */
 539     public JLayeredPane getLayeredPane() {
 540         return getRootPane().getLayeredPane();
 541     }
 542 
 543     /**
 544      * Sets the <code>layeredPane</code> property.
 545      * This method is called by the constructor.
 546      *
 547      * @param layeredPane the new <code>layeredPane</code> object
 548      *
 549      * @exception IllegalComponentStateException (a runtime
 550      *            exception) if the content pane parameter is <code>null</code>
 551      * @see #getLayeredPane
 552      * @see RootPaneContainer#setLayeredPane
 553      *
 554      * @beaninfo
 555      *     hidden: true
 556      *     description: The pane which holds the various window layers.
 557      */
 558     public void setLayeredPane(JLayeredPane layeredPane) {
 559         getRootPane().setLayeredPane(layeredPane);
 560     }
 561 
 562     /**
 563      * Returns the <code>glassPane Component</code> for this window.
 564      *
 565      * @return the <code>glassPane</code> property
 566      * @see #setGlassPane
 567      * @see RootPaneContainer#getGlassPane
 568      */
 569     public Component getGlassPane() {
 570         return getRootPane().getGlassPane();
 571     }
 572 
 573     /**
 574      * Sets the <code>glassPane</code> property.
 575      * This method is called by the constructor.
 576      * @param glassPane the <code>glassPane</code> object for this window
 577      *
 578      * @see #getGlassPane
 579      * @see RootPaneContainer#setGlassPane
 580      *
 581      * @beaninfo
 582      *     hidden: true
 583      *     description: A transparent pane used for menu rendering.
 584      */
 585     public void setGlassPane(Component glassPane) {
 586         getRootPane().setGlassPane(glassPane);
 587     }
 588 
 589     /**
 590      * {@inheritDoc}
 591      *
 592      * @since 1.6
 593      */
 594     public Graphics getGraphics() {
 595         JComponent.getGraphicsInvoked(this);
 596         return super.getGraphics();
 597     }
 598 
 599     /**
 600      * Repaints the specified rectangle of this component within
 601      * <code>time</code> milliseconds.  Refer to <code>RepaintManager</code>
 602      * for details on how the repaint is handled.
 603      *
 604      * @param     time   maximum time in milliseconds before update
 605      * @param     x    the <i>x</i> coordinate
 606      * @param     y    the <i>y</i> coordinate
 607      * @param     width    the width
 608      * @param     height   the height
 609      * @see       RepaintManager
 610      * @since     1.6
 611      */
 612     public void repaint(long time, int x, int y, int width, int height) {
 613         if (RepaintManager.HANDLE_TOP_LEVEL_PAINT) {
 614             RepaintManager.currentManager(this).addDirtyRegion(
 615                               this, x, y, width, height);
 616         }
 617         else {
 618             super.repaint(time, x, y, width, height);
 619         }
 620     }
 621 
 622     /**
 623      * Returns a string representation of this <code>JWindow</code>.
 624      * This method
 625      * is intended to be used only for debugging purposes, and the
 626      * content and format of the returned string may vary between
 627      * implementations. The returned string may be empty but may not
 628      * be <code>null</code>.
 629      *
 630      * @return  a string representation of this <code>JWindow</code>
 631      */
 632     protected String paramString() {
 633         String rootPaneCheckingEnabledString = (rootPaneCheckingEnabled ?
 634                                                 "true" : "false");
 635 
 636         return super.paramString() +
 637         ",rootPaneCheckingEnabled=" + rootPaneCheckingEnabledString;
 638     }
 639 
 640 
 641 /////////////////
 642 // Accessibility support
 643 ////////////////
 644 
 645     /** The accessible context property. */
 646     protected AccessibleContext accessibleContext = null;
 647 
 648     /**
 649      * Gets the AccessibleContext associated with this JWindow.
 650      * For JWindows, the AccessibleContext takes the form of an
 651      * AccessibleJWindow.
 652      * A new AccessibleJWindow instance is created if necessary.
 653      *
 654      * @return an AccessibleJWindow that serves as the
 655      *         AccessibleContext of this JWindow
 656      */
 657     public AccessibleContext getAccessibleContext() {
 658         if (accessibleContext == null) {
 659             accessibleContext = new AccessibleJWindow();
 660         }
 661         return accessibleContext;
 662     }
 663 
 664 
 665     /**
 666      * This class implements accessibility support for the
 667      * <code>JWindow</code> class.  It provides an implementation of the
 668      * Java Accessibility API appropriate to window user-interface
 669      * elements.
 670      */
 671     @SuppressWarnings("serial")
 672     protected class AccessibleJWindow extends AccessibleAWTWindow {
 673         // everything is in the new parent, AccessibleAWTWindow
 674     }
 675 
 676 }