1 /*
   2  * Copyright (c) 1997, 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 
  26 package sun.awt;
  27 
  28 import java.awt.*;
  29 import java.awt.event.InputEvent;
  30 import java.awt.event.KeyEvent;
  31 import java.awt.event.WindowEvent;
  32 import java.awt.image.BufferedImage;
  33 import java.awt.image.DataBuffer;
  34 import java.awt.image.DataBufferInt;
  35 import java.awt.image.ImageObserver;
  36 import java.awt.image.ImageProducer;
  37 import java.awt.image.Raster;
  38 import java.awt.peer.FramePeer;
  39 import java.awt.peer.KeyboardFocusManagerPeer;
  40 import java.awt.peer.MouseInfoPeer;
  41 import java.awt.peer.SystemTrayPeer;
  42 import java.awt.peer.TrayIconPeer;
  43 import java.io.File;
  44 import java.io.IOException;
  45 import java.io.InputStream;
  46 import java.lang.reflect.InvocationTargetException;
  47 import java.net.URL;
  48 import java.security.AccessController;
  49 import java.util.Collections;
  50 import java.util.Iterator;
  51 import java.util.Locale;
  52 import java.util.Map;
  53 import java.util.Vector;
  54 import java.util.WeakHashMap;
  55 import java.util.concurrent.TimeUnit;
  56 import java.util.concurrent.locks.Condition;
  57 import java.util.concurrent.locks.ReentrantLock;
  58 
  59 import sun.awt.im.InputContext;
  60 import sun.awt.image.ByteArrayImageSource;
  61 import sun.awt.image.FileImageSource;
  62 import sun.awt.image.ImageRepresentation;
  63 import java.awt.image.MultiResolutionImage;
  64 import sun.awt.image.MultiResolutionToolkitImage;
  65 import sun.awt.image.ToolkitImage;
  66 import sun.awt.image.URLImageSource;
  67 import sun.font.FontDesignMetrics;
  68 import sun.misc.SoftCache;
  69 import sun.net.util.URLUtil;
  70 import sun.security.action.GetBooleanAction;
  71 import sun.security.action.GetPropertyAction;
  72 import sun.util.logging.PlatformLogger;
  73 
  74 import static java.awt.RenderingHints.*;
  75 
  76 public abstract class SunToolkit extends Toolkit
  77     implements ComponentFactory, InputMethodSupport, KeyboardFocusManagerPeerProvider {
  78 
  79     // 8014718: logging has been removed from SunToolkit
  80 
  81     /* Load debug settings for native code */
  82     static {
  83         if (AccessController.doPrivileged(new GetBooleanAction("sun.awt.nativedebug"))) {
  84             DebugSettings.init();
  85         }
  86     };
  87 
  88     /**
  89      * Special mask for the UngrabEvent events, in addition to the
  90      * public masks defined in AWTEvent.  Should be used as the mask
  91      * value for Toolkit.addAWTEventListener.
  92      */
  93     public static final int GRAB_EVENT_MASK = 0x80000000;
  94 
  95     /* The key to put()/get() the PostEventQueue into/from the AppContext.
  96      */
  97     private static final String POST_EVENT_QUEUE_KEY = "PostEventQueue";
  98 
  99     /**
 100      * Number of buttons.
 101      * By default it's taken from the system. If system value does not
 102      * fit into int type range, use our own MAX_BUTTONS_SUPPORT value.
 103      */
 104     protected static int numberOfButtons = 0;
 105 
 106 
 107     /* XFree standard mention 24 buttons as maximum:
 108      * http://www.xfree86.org/current/mouse.4.html
 109      * We workaround systems supporting more than 24 buttons.
 110      * Otherwise, we have to use long type values as masks
 111      * which leads to API change.
 112      * InputEvent.BUTTON_DOWN_MASK may contain only 21 masks due to
 113      * the 4-bytes limit for the int type. (CR 6799099)
 114      * One more bit is reserved for FIRST_HIGH_BIT.
 115      */
 116     public static final int MAX_BUTTONS_SUPPORTED = 20;
 117 
 118     /**
 119      * Creates and initializes EventQueue instance for the specified
 120      * AppContext.
 121      * Note that event queue must be created from createNewAppContext()
 122      * only in order to ensure that EventQueue constructor obtains
 123      * the correct AppContext.
 124      * @param appContext AppContext to associate with the event queue
 125      */
 126     private static void initEQ(AppContext appContext) {
 127         EventQueue eventQueue = new EventQueue();
 128         appContext.put(AppContext.EVENT_QUEUE_KEY, eventQueue);
 129 
 130         PostEventQueue postEventQueue = new PostEventQueue(eventQueue);
 131         appContext.put(POST_EVENT_QUEUE_KEY, postEventQueue);
 132     }
 133 
 134     public SunToolkit() {
 135     }
 136 
 137     public boolean useBufferPerWindow() {
 138         return false;
 139     }
 140 
 141     public abstract FramePeer createLightweightFrame(LightweightFrame target)
 142         throws HeadlessException;
 143 
 144     public abstract TrayIconPeer createTrayIcon(TrayIcon target)
 145         throws HeadlessException, AWTException;
 146 
 147     public abstract SystemTrayPeer createSystemTray(SystemTray target);
 148 
 149     public abstract boolean isTraySupported();
 150 
 151     @Override
 152     public abstract KeyboardFocusManagerPeer getKeyboardFocusManagerPeer()
 153         throws HeadlessException;
 154 
 155     /**
 156      * The AWT lock is typically only used on Unix platforms to synchronize
 157      * access to Xlib, OpenGL, etc.  However, these methods are implemented
 158      * in SunToolkit so that they can be called from shared code (e.g.
 159      * from the OGL pipeline) or from the X11 pipeline regardless of whether
 160      * XToolkit or MToolkit is currently in use.  There are native macros
 161      * (such as AWT_LOCK) defined in awt.h, so if the implementation of these
 162      * methods is changed, make sure it is compatible with the native macros.
 163      *
 164      * Note: The following methods (awtLock(), awtUnlock(), etc) should be
 165      * used in place of:
 166      *     synchronized (getAWTLock()) {
 167      *         ...
 168      *     }
 169      *
 170      * By factoring these methods out specially, we are able to change the
 171      * implementation of these methods (e.g. use more advanced locking
 172      * mechanisms) without impacting calling code.
 173      *
 174      * Sample usage:
 175      *     private void doStuffWithXlib() {
 176      *         assert !SunToolkit.isAWTLockHeldByCurrentThread();
 177      *         SunToolkit.awtLock();
 178      *         try {
 179      *             ...
 180      *             XlibWrapper.XDoStuff();
 181      *         } finally {
 182      *             SunToolkit.awtUnlock();
 183      *         }
 184      *     }
 185      */
 186 
 187     private static final ReentrantLock AWT_LOCK = new ReentrantLock();
 188     private static final Condition AWT_LOCK_COND = AWT_LOCK.newCondition();
 189 
 190     public static final void awtLock() {
 191         AWT_LOCK.lock();
 192     }
 193 
 194     public static final boolean awtTryLock() {
 195         return AWT_LOCK.tryLock();
 196     }
 197 
 198     public static final void awtUnlock() {
 199         AWT_LOCK.unlock();
 200     }
 201 
 202     public static final void awtLockWait()
 203         throws InterruptedException
 204     {
 205         AWT_LOCK_COND.await();
 206     }
 207 
 208     public static final void awtLockWait(long timeout)
 209         throws InterruptedException
 210     {
 211         AWT_LOCK_COND.await(timeout, TimeUnit.MILLISECONDS);
 212     }
 213 
 214     public static final void awtLockNotify() {
 215         AWT_LOCK_COND.signal();
 216     }
 217 
 218     public static final void awtLockNotifyAll() {
 219         AWT_LOCK_COND.signalAll();
 220     }
 221 
 222     public static final boolean isAWTLockHeldByCurrentThread() {
 223         return AWT_LOCK.isHeldByCurrentThread();
 224     }
 225 
 226     /*
 227      * Create a new AppContext, along with its EventQueue, for a
 228      * new ThreadGroup.  Browser code, for example, would use this
 229      * method to create an AppContext & EventQueue for an Applet.
 230      */
 231     public static AppContext createNewAppContext() {
 232         ThreadGroup threadGroup = Thread.currentThread().getThreadGroup();
 233         return createNewAppContext(threadGroup);
 234     }
 235 
 236     static final AppContext createNewAppContext(ThreadGroup threadGroup) {
 237         // Create appContext before initialization of EventQueue, so all
 238         // the calls to AppContext.getAppContext() from EventQueue ctor
 239         // return correct values
 240         AppContext appContext = new AppContext(threadGroup);
 241         initEQ(appContext);
 242 
 243         return appContext;
 244     }
 245 
 246     static void wakeupEventQueue(EventQueue q, boolean isShutdown){
 247         AWTAccessor.getEventQueueAccessor().wakeup(q, isShutdown);
 248     }
 249 
 250     /*
 251      * Fetch the peer associated with the given target (as specified
 252      * in the peer creation method).  This can be used to determine
 253      * things like what the parent peer is.  If the target is null
 254      * or the target can't be found (either because the a peer was
 255      * never created for it or the peer was disposed), a null will
 256      * be returned.
 257      */
 258     protected static Object targetToPeer(Object target) {
 259         if (target != null && !GraphicsEnvironment.isHeadless()) {
 260             return AWTAutoShutdown.getInstance().getPeer(target);
 261         }
 262         return null;
 263     }
 264 
 265     protected static void targetCreatedPeer(Object target, Object peer) {
 266         if (target != null && peer != null &&
 267             !GraphicsEnvironment.isHeadless())
 268         {
 269             AWTAutoShutdown.getInstance().registerPeer(target, peer);
 270         }
 271     }
 272 
 273     protected static void targetDisposedPeer(Object target, Object peer) {
 274         if (target != null && peer != null &&
 275             !GraphicsEnvironment.isHeadless())
 276         {
 277             AWTAutoShutdown.getInstance().unregisterPeer(target, peer);
 278         }
 279     }
 280 
 281     // Maps from non-Component/MenuComponent to AppContext.
 282     // WeakHashMap<Component,AppContext>
 283     private static final Map<Object, AppContext> appContextMap =
 284         Collections.synchronizedMap(new WeakIdentityHashMap<Object, AppContext>());
 285 
 286     /**
 287      * Sets the appContext field of target. If target is not a Component or
 288      * MenuComponent, this returns false.
 289      */
 290     private static boolean setAppContext(Object target,
 291                                          AppContext context) {
 292         if (target instanceof Component) {
 293             AWTAccessor.getComponentAccessor().
 294                 setAppContext((Component)target, context);
 295         } else if (target instanceof MenuComponent) {
 296             AWTAccessor.getMenuComponentAccessor().
 297                 setAppContext((MenuComponent)target, context);
 298         } else {
 299             return false;
 300         }
 301         return true;
 302     }
 303 
 304     /**
 305      * Returns the appContext field for target. If target is not a
 306      * Component or MenuComponent this returns null.
 307      */
 308     private static AppContext getAppContext(Object target) {
 309         if (target instanceof Component) {
 310             return AWTAccessor.getComponentAccessor().
 311                        getAppContext((Component)target);
 312         } else if (target instanceof MenuComponent) {
 313             return AWTAccessor.getMenuComponentAccessor().
 314                        getAppContext((MenuComponent)target);
 315         } else {
 316             return null;
 317         }
 318     }
 319 
 320     /*
 321      * Fetch the AppContext associated with the given target.
 322      * This can be used to determine things like which EventQueue
 323      * to use for posting events to a Component.  If the target is
 324      * null or the target can't be found, a null with be returned.
 325      */
 326     public static AppContext targetToAppContext(Object target) {
 327         if (target == null) {
 328             return null;
 329         }
 330         AppContext context = getAppContext(target);
 331         if (context == null) {
 332             // target is not a Component/MenuComponent, try the
 333             // appContextMap.
 334             context = appContextMap.get(target);
 335         }
 336         return context;
 337     }
 338 
 339      /**
 340       * Sets the synchronous status of focus requests on lightweight
 341       * components in the specified window to the specified value.
 342       * If the boolean parameter is <code>true</code> then the focus
 343       * requests on lightweight components will be performed
 344       * synchronously, if it is <code>false</code>, then asynchronously.
 345       * By default, all windows have their lightweight request status
 346       * set to asynchronous.
 347       * <p>
 348       * The application can only set the status of lightweight focus
 349       * requests to synchronous for any of its windows if it doesn't
 350       * perform focus transfers between different heavyweight containers.
 351       * In this case the observable focus behaviour is the same as with
 352       * asynchronous status.
 353       * <p>
 354       * If the application performs focus transfer between different
 355       * heavyweight containers and sets the lightweight focus request
 356       * status to synchronous for any of its windows, then further focus
 357       * behaviour is unspecified.
 358       * <p>
 359       * @param    changed the window for which the lightweight focus request
 360       *           status should be set
 361       * @param    status the value of lightweight focus request status
 362       */
 363 
 364     public static void setLWRequestStatus(Window changed,boolean status){
 365         AWTAccessor.getWindowAccessor().setLWRequestStatus(changed, status);
 366     };
 367 
 368     public static void checkAndSetPolicy(Container cont) {
 369         FocusTraversalPolicy defaultPolicy = KeyboardFocusManager.
 370             getCurrentKeyboardFocusManager().
 371                 getDefaultFocusTraversalPolicy();
 372 
 373         cont.setFocusTraversalPolicy(defaultPolicy);
 374     }
 375 
 376     private static FocusTraversalPolicy createLayoutPolicy() {
 377         FocusTraversalPolicy policy = null;
 378         try {
 379             Class<?> layoutPolicyClass =
 380                 Class.forName("javax.swing.LayoutFocusTraversalPolicy");
 381             policy = (FocusTraversalPolicy)layoutPolicyClass.newInstance();
 382         }
 383         catch (ClassNotFoundException e) {
 384             assert false;
 385         }
 386         catch (InstantiationException e) {
 387             assert false;
 388         }
 389         catch (IllegalAccessException e) {
 390             assert false;
 391         }
 392 
 393         return policy;
 394     }
 395 
 396     /*
 397      * Insert a mapping from target to AppContext, for later retrieval
 398      * via targetToAppContext() above.
 399      */
 400     public static void insertTargetMapping(Object target, AppContext appContext) {
 401         if (!setAppContext(target, appContext)) {
 402             // Target is not a Component/MenuComponent, use the private Map
 403             // instead.
 404             appContextMap.put(target, appContext);
 405         }
 406     }
 407 
 408     /*
 409      * Post an AWTEvent to the Java EventQueue, using the PostEventQueue
 410      * to avoid possibly calling client code (EventQueueSubclass.postEvent())
 411      * on the toolkit (AWT-Windows/AWT-Motif) thread.  This function should
 412      * not be called under another lock since it locks the EventQueue.
 413      * See bugids 4632918, 4526597.
 414      */
 415     public static void postEvent(AppContext appContext, AWTEvent event) {
 416         if (event == null) {
 417             throw new NullPointerException();
 418         }
 419 
 420         AWTAccessor.SequencedEventAccessor sea = AWTAccessor.getSequencedEventAccessor();
 421         if (sea != null && sea.isSequencedEvent(event)) {
 422             AWTEvent nested = sea.getNested(event);
 423             if (nested.getID() == WindowEvent.WINDOW_LOST_FOCUS &&
 424                 nested instanceof TimedWindowEvent)
 425             {
 426                 TimedWindowEvent twe = (TimedWindowEvent)nested;
 427                 ((SunToolkit)Toolkit.getDefaultToolkit()).
 428                     setWindowDeactivationTime((Window)twe.getSource(), twe.getWhen());
 429             }
 430         }
 431 
 432         // All events posted via this method are system-generated.
 433         // Placing the following call here reduces considerably the
 434         // number of places throughout the toolkit that would
 435         // otherwise have to be modified to precisely identify
 436         // system-generated events.
 437         setSystemGenerated(event);
 438         AppContext eventContext = targetToAppContext(event.getSource());
 439         if (eventContext != null && !eventContext.equals(appContext)) {
 440             throw new RuntimeException("Event posted on wrong app context : " + event);
 441         }
 442         PostEventQueue postEventQueue =
 443             (PostEventQueue)appContext.get(POST_EVENT_QUEUE_KEY);
 444         if (postEventQueue != null) {
 445             postEventQueue.postEvent(event);
 446         }
 447     }
 448 
 449     /*
 450      * Post AWTEvent of high priority.
 451      */
 452     public static void postPriorityEvent(final AWTEvent e) {
 453         PeerEvent pe = new PeerEvent(Toolkit.getDefaultToolkit(), new Runnable() {
 454                 @Override
 455                 public void run() {
 456                     AWTAccessor.getAWTEventAccessor().setPosted(e);
 457                     ((Component)e.getSource()).dispatchEvent(e);
 458                 }
 459             }, PeerEvent.ULTIMATE_PRIORITY_EVENT);
 460         postEvent(targetToAppContext(e.getSource()), pe);
 461     }
 462 
 463     /*
 464      * Flush any pending events which haven't been posted to the AWT
 465      * EventQueue yet.
 466      */
 467     public static void flushPendingEvents()  {
 468         AppContext appContext = AppContext.getAppContext();
 469         flushPendingEvents(appContext);
 470     }
 471 
 472     /*
 473      * Flush the PostEventQueue for the right AppContext.
 474      * The default flushPendingEvents only flushes the thread-local context,
 475      * which is not always correct, c.f. 3746956
 476      */
 477     public static void flushPendingEvents(AppContext appContext) {
 478         PostEventQueue postEventQueue =
 479                 (PostEventQueue)appContext.get(POST_EVENT_QUEUE_KEY);
 480         if (postEventQueue != null) {
 481             postEventQueue.flush();
 482         }
 483     }
 484 
 485     /*
 486      * Execute a chunk of code on the Java event handler thread for the
 487      * given target.  Does not wait for the execution to occur before
 488      * returning to the caller.
 489      */
 490     public static void executeOnEventHandlerThread(Object target,
 491                                                    Runnable runnable) {
 492         executeOnEventHandlerThread(new PeerEvent(target, runnable, PeerEvent.PRIORITY_EVENT));
 493     }
 494 
 495     /*
 496      * Fixed 5064013: the InvocationEvent time should be equals
 497      * the time of the ActionEvent
 498      */
 499     @SuppressWarnings("serial")
 500     public static void executeOnEventHandlerThread(Object target,
 501                                                    Runnable runnable,
 502                                                    final long when) {
 503         executeOnEventHandlerThread(
 504             new PeerEvent(target, runnable, PeerEvent.PRIORITY_EVENT) {
 505                 @Override
 506                 public long getWhen() {
 507                     return when;
 508                 }
 509             });
 510     }
 511 
 512     /*
 513      * Execute a chunk of code on the Java event handler thread for the
 514      * given target.  Does not wait for the execution to occur before
 515      * returning to the caller.
 516      */
 517     public static void executeOnEventHandlerThread(PeerEvent peerEvent) {
 518         postEvent(targetToAppContext(peerEvent.getSource()), peerEvent);
 519     }
 520 
 521     /*
 522      * Execute a chunk of code on the Java event handler thread. The
 523      * method takes into account provided AppContext and sets
 524      * <code>SunToolkit.getDefaultToolkit()</code> as a target of the
 525      * event. See 6451487 for detailes.
 526      * Does not wait for the execution to occur before returning to
 527      * the caller.
 528      */
 529      public static void invokeLaterOnAppContext(
 530         AppContext appContext, Runnable dispatcher)
 531      {
 532         postEvent(appContext,
 533             new PeerEvent(Toolkit.getDefaultToolkit(), dispatcher,
 534                 PeerEvent.PRIORITY_EVENT));
 535      }
 536 
 537     /*
 538      * Execute a chunk of code on the Java event handler thread for the
 539      * given target.  Waits for the execution to occur before returning
 540      * to the caller.
 541      */
 542     public static void executeOnEDTAndWait(Object target, Runnable runnable)
 543         throws InterruptedException, InvocationTargetException
 544     {
 545         if (EventQueue.isDispatchThread()) {
 546             throw new Error("Cannot call executeOnEDTAndWait from any event dispatcher thread");
 547         }
 548 
 549         class AWTInvocationLock {}
 550         Object lock = new AWTInvocationLock();
 551 
 552         PeerEvent event = new PeerEvent(target, runnable, lock, true, PeerEvent.PRIORITY_EVENT);
 553 
 554         synchronized (lock) {
 555             executeOnEventHandlerThread(event);
 556             while(!event.isDispatched()) {
 557                 lock.wait();
 558             }
 559         }
 560 
 561         Throwable eventThrowable = event.getThrowable();
 562         if (eventThrowable != null) {
 563             throw new InvocationTargetException(eventThrowable);
 564         }
 565     }
 566 
 567     /*
 568      * Returns true if the calling thread is the event dispatch thread
 569      * contained within AppContext which associated with the given target.
 570      * Use this call to ensure that a given task is being executed
 571      * (or not being) on the event dispatch thread for the given target.
 572      */
 573     public static boolean isDispatchThreadForAppContext(Object target) {
 574         AppContext appContext = targetToAppContext(target);
 575         EventQueue eq = (EventQueue)appContext.get(AppContext.EVENT_QUEUE_KEY);
 576 
 577         AWTAccessor.EventQueueAccessor accessor = AWTAccessor.getEventQueueAccessor();
 578         return accessor.isDispatchThreadImpl(eq);
 579     }
 580 
 581     @Override
 582     public Dimension getScreenSize() {
 583         return new Dimension(getScreenWidth(), getScreenHeight());
 584     }
 585     protected abstract int getScreenWidth();
 586     protected abstract int getScreenHeight();
 587 
 588     @Override
 589     @SuppressWarnings("deprecation")
 590     public FontMetrics getFontMetrics(Font font) {
 591         return FontDesignMetrics.getMetrics(font);
 592     }
 593 
 594     @Override
 595     @SuppressWarnings("deprecation")
 596     public String[] getFontList() {
 597         String[] hardwiredFontList = {
 598             Font.DIALOG, Font.SANS_SERIF, Font.SERIF, Font.MONOSPACED,
 599             Font.DIALOG_INPUT
 600 
 601             // -- Obsolete font names from 1.0.2.  It was decided that
 602             // -- getFontList should not return these old names:
 603             //    "Helvetica", "TimesRoman", "Courier", "ZapfDingbats"
 604         };
 605         return hardwiredFontList;
 606     }
 607 
 608     /**
 609      * Disables erasing of background on the canvas before painting if
 610      * this is supported by the current toolkit. It is recommended to
 611      * call this method early, before the Canvas becomes displayable,
 612      * because some Toolkit implementations do not support changing
 613      * this property once the Canvas becomes displayable.
 614      */
 615     public void disableBackgroundErase(Canvas canvas) {
 616         disableBackgroundEraseImpl(canvas);
 617     }
 618 
 619     /**
 620      * Disables the native erasing of the background on the given
 621      * component before painting if this is supported by the current
 622      * toolkit. This only has an effect for certain components such as
 623      * Canvas, Panel and Window. It is recommended to call this method
 624      * early, before the Component becomes displayable, because some
 625      * Toolkit implementations do not support changing this property
 626      * once the Component becomes displayable.
 627      */
 628     public void disableBackgroundErase(Component component) {
 629         disableBackgroundEraseImpl(component);
 630     }
 631 
 632     private void disableBackgroundEraseImpl(Component component) {
 633         AWTAccessor.getComponentAccessor().setBackgroundEraseDisabled(component, true);
 634     }
 635 
 636     /**
 637      * Returns the value of "sun.awt.noerasebackground" property. Default
 638      * value is {@code false}.
 639      */
 640     public static boolean getSunAwtNoerasebackground() {
 641         return AccessController.doPrivileged(new GetBooleanAction("sun.awt.noerasebackground"));
 642     }
 643 
 644     /**
 645      * Returns the value of "sun.awt.erasebackgroundonresize" property. Default
 646      * value is {@code false}.
 647      */
 648     public static boolean getSunAwtErasebackgroundonresize() {
 649         return AccessController.doPrivileged(new GetBooleanAction("sun.awt.erasebackgroundonresize"));
 650     }
 651 
 652 
 653     @SuppressWarnings("deprecation")
 654     static final SoftCache fileImgCache = new SoftCache();
 655 
 656     @SuppressWarnings("deprecation")
 657     static final SoftCache urlImgCache = new SoftCache();
 658 
 659     static Image getImageFromHash(Toolkit tk, URL url) {
 660         checkPermissions(url);
 661         synchronized (urlImgCache) {
 662             String key = url.toString();
 663             Image img = (Image)urlImgCache.get(key);
 664             if (img == null) {
 665                 try {
 666                     img = tk.createImage(new URLImageSource(url));
 667                     urlImgCache.put(key, img);
 668                 } catch (Exception e) {
 669                 }
 670             }
 671             return img;
 672         }
 673     }
 674 
 675     static Image getImageFromHash(Toolkit tk,
 676                                                String filename) {
 677         checkPermissions(filename);
 678         synchronized (fileImgCache) {
 679             Image img = (Image)fileImgCache.get(filename);
 680             if (img == null) {
 681                 try {
 682                     img = tk.createImage(new FileImageSource(filename));
 683                     fileImgCache.put(filename, img);
 684                 } catch (Exception e) {
 685                 }
 686             }
 687             return img;
 688         }
 689     }
 690 
 691     @Override
 692     public Image getImage(String filename) {
 693         return getImageFromHash(this, filename);
 694     }
 695 
 696     @Override
 697     public Image getImage(URL url) {
 698         return getImageFromHash(this, url);
 699     }
 700 
 701     protected Image getImageWithResolutionVariant(String fileName,
 702             String resolutionVariantName) {
 703         synchronized (fileImgCache) {
 704             Image image = getImageFromHash(this, fileName);
 705             if (image instanceof MultiResolutionImage) {
 706                 return image;
 707             }
 708             Image resolutionVariant = getImageFromHash(this, resolutionVariantName);
 709             image = createImageWithResolutionVariant(image, resolutionVariant);
 710             fileImgCache.put(fileName, image);
 711             return image;
 712         }
 713     }
 714 
 715     protected Image getImageWithResolutionVariant(URL url,
 716             URL resolutionVariantURL) {
 717         synchronized (urlImgCache) {
 718             Image image = getImageFromHash(this, url);
 719             if (image instanceof MultiResolutionImage) {
 720                 return image;
 721             }
 722             Image resolutionVariant = getImageFromHash(this, resolutionVariantURL);
 723             image = createImageWithResolutionVariant(image, resolutionVariant);
 724             String key = url.toString();
 725             urlImgCache.put(key, image);
 726             return image;
 727         }
 728     }
 729 
 730 
 731     @Override
 732     public Image createImage(String filename) {
 733         checkPermissions(filename);
 734         return createImage(new FileImageSource(filename));
 735     }
 736 
 737     @Override
 738     public Image createImage(URL url) {
 739         checkPermissions(url);
 740         return createImage(new URLImageSource(url));
 741     }
 742 
 743     @Override
 744     public Image createImage(byte[] data, int offset, int length) {
 745         return createImage(new ByteArrayImageSource(data, offset, length));
 746     }
 747 
 748     @Override
 749     public Image createImage(ImageProducer producer) {
 750         return new ToolkitImage(producer);
 751     }
 752 
 753     public static Image createImageWithResolutionVariant(Image image,
 754             Image resolutionVariant) {
 755         return new MultiResolutionToolkitImage(image, resolutionVariant);
 756     }
 757 
 758     @Override
 759     public int checkImage(Image img, int w, int h, ImageObserver o) {
 760         if (!(img instanceof ToolkitImage)) {
 761             return ImageObserver.ALLBITS;
 762         }
 763 
 764         ToolkitImage tkimg = (ToolkitImage)img;
 765         int repbits;
 766         if (w == 0 || h == 0) {
 767             repbits = ImageObserver.ALLBITS;
 768         } else {
 769             repbits = tkimg.getImageRep().check(o);
 770         }
 771         return (tkimg.check(o) | repbits) & checkResolutionVariant(img, w, h, o);
 772     }
 773 
 774     @Override
 775     public boolean prepareImage(Image img, int w, int h, ImageObserver o) {
 776         if (w == 0 || h == 0) {
 777             return true;
 778         }
 779 
 780         // Must be a ToolkitImage
 781         if (!(img instanceof ToolkitImage)) {
 782             return true;
 783         }
 784 
 785         ToolkitImage tkimg = (ToolkitImage)img;
 786         if (tkimg.hasError()) {
 787             if (o != null) {
 788                 o.imageUpdate(img, ImageObserver.ERROR|ImageObserver.ABORT,
 789                               -1, -1, -1, -1);
 790             }
 791             return false;
 792         }
 793         ImageRepresentation ir = tkimg.getImageRep();
 794         return ir.prepare(o) & prepareResolutionVariant(img, w, h, o);
 795     }
 796 
 797     private int checkResolutionVariant(Image img, int w, int h, ImageObserver o) {
 798         ToolkitImage rvImage = getResolutionVariant(img);
 799         int rvw = getRVSize(w);
 800         int rvh = getRVSize(h);
 801         // Ignore the resolution variant in case of error
 802         return (rvImage == null || rvImage.hasError()) ? 0xFFFF :
 803                 checkImage(rvImage, rvw, rvh, MultiResolutionToolkitImage.
 804                                 getResolutionVariantObserver(
 805                                         img, o, w, h, rvw, rvh, true));
 806     }
 807 
 808     private boolean prepareResolutionVariant(Image img, int w, int h,
 809             ImageObserver o) {
 810 
 811         ToolkitImage rvImage = getResolutionVariant(img);
 812         int rvw = getRVSize(w);
 813         int rvh = getRVSize(h);
 814         // Ignore the resolution variant in case of error
 815         return rvImage == null || rvImage.hasError() || prepareImage(
 816                 rvImage, rvw, rvh,
 817                 MultiResolutionToolkitImage.getResolutionVariantObserver(
 818                         img, o, w, h, rvw, rvh, true));
 819     }
 820 
 821     private static int getRVSize(int size){
 822         return size == -1 ? -1 : 2 * size;
 823     }
 824 
 825     private static ToolkitImage getResolutionVariant(Image image) {
 826         if (image instanceof MultiResolutionToolkitImage) {
 827             Image resolutionVariant = ((MultiResolutionToolkitImage) image).
 828                     getResolutionVariant();
 829             if (resolutionVariant instanceof ToolkitImage) {
 830                 return (ToolkitImage) resolutionVariant;
 831             }
 832         }
 833         return null;
 834     }
 835 
 836     protected static boolean imageCached(String fileName) {
 837         return fileImgCache.containsKey(fileName);
 838     }
 839 
 840     protected static boolean imageCached(URL url) {
 841         String key = url.toString();
 842         return urlImgCache.containsKey(key);
 843     }
 844 
 845     protected static boolean imageExists(String filename) {
 846         if (filename != null) {
 847             checkPermissions(filename);
 848             return new File(filename).exists();
 849         }
 850         return false;
 851     }
 852 
 853     @SuppressWarnings("try")
 854     protected static boolean imageExists(URL url) {
 855         if (url != null) {
 856             checkPermissions(url);
 857             try (InputStream is = url.openStream()) {
 858                 return true;
 859             }catch(IOException e){
 860                 return false;
 861             }
 862         }
 863         return false;
 864     }
 865 
 866     private static void checkPermissions(String filename) {
 867         SecurityManager security = System.getSecurityManager();
 868         if (security != null) {
 869             security.checkRead(filename);
 870         }
 871     }
 872 
 873     private static void checkPermissions(URL url) {
 874         SecurityManager sm = System.getSecurityManager();
 875         if (sm != null) {
 876             try {
 877                 java.security.Permission perm =
 878                     URLUtil.getConnectPermission(url);
 879                 if (perm != null) {
 880                     try {
 881                         sm.checkPermission(perm);
 882                     } catch (SecurityException se) {
 883                         // fallback to checkRead/checkConnect for pre 1.2
 884                         // security managers
 885                         if ((perm instanceof java.io.FilePermission) &&
 886                             perm.getActions().indexOf("read") != -1) {
 887                             sm.checkRead(perm.getName());
 888                         } else if ((perm instanceof
 889                             java.net.SocketPermission) &&
 890                             perm.getActions().indexOf("connect") != -1) {
 891                             sm.checkConnect(url.getHost(), url.getPort());
 892                         } else {
 893                             throw se;
 894                         }
 895                     }
 896                 }
 897             } catch (java.io.IOException ioe) {
 898                     sm.checkConnect(url.getHost(), url.getPort());
 899             }
 900         }
 901     }
 902 
 903     /**
 904      * Scans {@code imageList} for best-looking image of specified dimensions.
 905      * Image can be scaled and/or padded with transparency.
 906      */
 907     public static BufferedImage getScaledIconImage(java.util.List<Image> imageList, int width, int height) {
 908         if (width == 0 || height == 0) {
 909             return null;
 910         }
 911         Image bestImage = null;
 912         int bestWidth = 0;
 913         int bestHeight = 0;
 914         double bestSimilarity = 3; //Impossibly high value
 915         double bestScaleFactor = 0;
 916         for (Iterator<Image> i = imageList.iterator();i.hasNext();) {
 917             //Iterate imageList looking for best matching image.
 918             //'Similarity' measure is defined as good scale factor and small insets.
 919             //best possible similarity is 0 (no scale, no insets).
 920             //It's found while the experiments that good-looking result is achieved
 921             //with scale factors x1, x3/4, x2/3, xN, x1/N.
 922             Image im = i.next();
 923             if (im == null) {
 924                 continue;
 925             }
 926             if (im instanceof ToolkitImage) {
 927                 ImageRepresentation ir = ((ToolkitImage)im).getImageRep();
 928                 ir.reconstruct(ImageObserver.ALLBITS);
 929             }
 930             int iw;
 931             int ih;
 932             try {
 933                 iw = im.getWidth(null);
 934                 ih = im.getHeight(null);
 935             } catch (Exception e){
 936                 continue;
 937             }
 938             if (iw > 0 && ih > 0) {
 939                 //Calc scale factor
 940                 double scaleFactor = Math.min((double)width / (double)iw,
 941                                               (double)height / (double)ih);
 942                 //Calculate scaled image dimensions
 943                 //adjusting scale factor to nearest "good" value
 944                 int adjw = 0;
 945                 int adjh = 0;
 946                 double scaleMeasure = 1; //0 - best (no) scale, 1 - impossibly bad
 947                 if (scaleFactor >= 2) {
 948                     //Need to enlarge image more than twice
 949                     //Round down scale factor to multiply by integer value
 950                     scaleFactor = Math.floor(scaleFactor);
 951                     adjw = iw * (int)scaleFactor;
 952                     adjh = ih * (int)scaleFactor;
 953                     scaleMeasure = 1.0 - 0.5 / scaleFactor;
 954                 } else if (scaleFactor >= 1) {
 955                     //Don't scale
 956                     scaleFactor = 1.0;
 957                     adjw = iw;
 958                     adjh = ih;
 959                     scaleMeasure = 0;
 960                 } else if (scaleFactor >= 0.75) {
 961                     //Multiply by 3/4
 962                     scaleFactor = 0.75;
 963                     adjw = iw * 3 / 4;
 964                     adjh = ih * 3 / 4;
 965                     scaleMeasure = 0.3;
 966                 } else if (scaleFactor >= 0.6666) {
 967                     //Multiply by 2/3
 968                     scaleFactor = 0.6666;
 969                     adjw = iw * 2 / 3;
 970                     adjh = ih * 2 / 3;
 971                     scaleMeasure = 0.33;
 972                 } else {
 973                     //Multiply size by 1/scaleDivider
 974                     //where scaleDivider is minimum possible integer
 975                     //larger than 1/scaleFactor
 976                     double scaleDivider = Math.ceil(1.0 / scaleFactor);
 977                     scaleFactor = 1.0 / scaleDivider;
 978                     adjw = (int)Math.round((double)iw / scaleDivider);
 979                     adjh = (int)Math.round((double)ih / scaleDivider);
 980                     scaleMeasure = 1.0 - 1.0 / scaleDivider;
 981                 }
 982                 double similarity = ((double)width - (double)adjw) / (double)width +
 983                     ((double)height - (double)adjh) / (double)height + //Large padding is bad
 984                     scaleMeasure; //Large rescale is bad
 985                 if (similarity < bestSimilarity) {
 986                     bestSimilarity = similarity;
 987                     bestScaleFactor = scaleFactor;
 988                     bestImage = im;
 989                     bestWidth = adjw;
 990                     bestHeight = adjh;
 991                 }
 992                 if (similarity == 0) break;
 993             }
 994         }
 995         if (bestImage == null) {
 996             //No images were found, possibly all are broken
 997             return null;
 998         }
 999         BufferedImage bimage =
1000             new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
1001         Graphics2D g = bimage.createGraphics();
1002         g.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
1003                            RenderingHints.VALUE_INTERPOLATION_BILINEAR);
1004         try {
1005             int x = (width - bestWidth) / 2;
1006             int y = (height - bestHeight) / 2;
1007             g.drawImage(bestImage, x, y, bestWidth, bestHeight, null);
1008         } finally {
1009             g.dispose();
1010         }
1011         return bimage;
1012     }
1013 
1014     public static DataBufferInt getScaledIconData(java.util.List<Image> imageList, int width, int height) {
1015         BufferedImage bimage = getScaledIconImage(imageList, width, height);
1016         if (bimage == null) {
1017             return null;
1018         }
1019         Raster raster = bimage.getRaster();
1020         DataBuffer buffer = raster.getDataBuffer();
1021         return (DataBufferInt)buffer;
1022     }
1023 
1024     @Override
1025     protected EventQueue getSystemEventQueueImpl() {
1026         return getSystemEventQueueImplPP();
1027     }
1028 
1029     // Package private implementation
1030     static EventQueue getSystemEventQueueImplPP() {
1031         return getSystemEventQueueImplPP(AppContext.getAppContext());
1032     }
1033 
1034     public static EventQueue getSystemEventQueueImplPP(AppContext appContext) {
1035         EventQueue theEventQueue =
1036             (EventQueue)appContext.get(AppContext.EVENT_QUEUE_KEY);
1037         return theEventQueue;
1038     }
1039 
1040     /**
1041      * Give native peers the ability to query the native container
1042      * given a native component (eg the direct parent may be lightweight).
1043      */
1044     public static Container getNativeContainer(Component c) {
1045         return Toolkit.getNativeContainer(c);
1046     }
1047 
1048     /**
1049      * Gives native peers the ability to query the closest HW component.
1050      * If the given component is heavyweight, then it returns this. Otherwise,
1051      * it goes one level up in the hierarchy and tests next component.
1052      */
1053     public static Component getHeavyweightComponent(Component c) {
1054         while (c != null && AWTAccessor.getComponentAccessor().isLightweight(c)) {
1055             c = AWTAccessor.getComponentAccessor().getParent(c);
1056         }
1057         return c;
1058     }
1059 
1060     /**
1061      * Returns key modifiers used by Swing to set up a focus accelerator key stroke.
1062      */
1063     public int getFocusAcceleratorKeyMask() {
1064         return InputEvent.ALT_MASK;
1065     }
1066 
1067     /**
1068      * Tests whether specified key modifiers mask can be used to enter a printable
1069      * character. This is a default implementation of this method, which reflects
1070      * the way things work on Windows: here, pressing ctrl + alt allows user to enter
1071      * characters from the extended character set (like euro sign or math symbols)
1072      */
1073     public boolean isPrintableCharacterModifiersMask(int mods) {
1074         return ((mods & InputEvent.ALT_MASK) == (mods & InputEvent.CTRL_MASK));
1075     }
1076 
1077     /**
1078      * Returns whether popup is allowed to be shown above the task bar.
1079      * This is a default implementation of this method, which checks
1080      * corresponding security permission.
1081      */
1082     public boolean canPopupOverlapTaskBar() {
1083         boolean result = true;
1084         try {
1085             SecurityManager sm = System.getSecurityManager();
1086             if (sm != null) {
1087                 sm.checkPermission(AWTPermissions.SET_WINDOW_ALWAYS_ON_TOP_PERMISSION);
1088             }
1089         } catch (SecurityException se) {
1090             // There is no permission to show popups over the task bar
1091             result = false;
1092         }
1093         return result;
1094     }
1095 
1096     /**
1097      * Returns a new input method window, with behavior as specified in
1098      * {@link java.awt.im.spi.InputMethodContext#createInputMethodWindow}.
1099      * If the inputContext is not null, the window should return it from its
1100      * getInputContext() method. The window needs to implement
1101      * sun.awt.im.InputMethodWindow.
1102      * <p>
1103      * SunToolkit subclasses can override this method to return better input
1104      * method windows.
1105      */
1106     @Override
1107     public Window createInputMethodWindow(String title, InputContext context) {
1108         return new sun.awt.im.SimpleInputMethodWindow(title, context);
1109     }
1110 
1111     /**
1112      * Returns whether enableInputMethods should be set to true for peered
1113      * TextComponent instances on this platform. False by default.
1114      */
1115     @Override
1116     public boolean enableInputMethodsForTextComponent() {
1117         return false;
1118     }
1119 
1120     private static Locale startupLocale = null;
1121 
1122     /**
1123      * Returns the locale in which the runtime was started.
1124      */
1125     public static Locale getStartupLocale() {
1126         if (startupLocale == null) {
1127             String language, region, country, variant;
1128             language = AccessController.doPrivileged(
1129                             new GetPropertyAction("user.language", "en"));
1130             // for compatibility, check for old user.region property
1131             region = AccessController.doPrivileged(
1132                             new GetPropertyAction("user.region"));
1133             if (region != null) {
1134                 // region can be of form country, country_variant, or _variant
1135                 int i = region.indexOf('_');
1136                 if (i >= 0) {
1137                     country = region.substring(0, i);
1138                     variant = region.substring(i + 1);
1139                 } else {
1140                     country = region;
1141                     variant = "";
1142                 }
1143             } else {
1144                 country = AccessController.doPrivileged(
1145                                 new GetPropertyAction("user.country", ""));
1146                 variant = AccessController.doPrivileged(
1147                                 new GetPropertyAction("user.variant", ""));
1148             }
1149             startupLocale = new Locale(language, country, variant);
1150         }
1151         return startupLocale;
1152     }
1153 
1154     /**
1155      * Returns the default keyboard locale of the underlying operating system
1156      */
1157     @Override
1158     public Locale getDefaultKeyboardLocale() {
1159         return getStartupLocale();
1160     }
1161 
1162     private static DefaultMouseInfoPeer mPeer = null;
1163 
1164     @Override
1165     public synchronized MouseInfoPeer getMouseInfoPeer() {
1166         if (mPeer == null) {
1167             mPeer = new DefaultMouseInfoPeer();
1168         }
1169         return mPeer;
1170     }
1171 
1172 
1173     /**
1174      * Returns whether default toolkit needs the support of the xembed
1175      * from embedding host(if any).
1176      * @return <code>true</code>, if XEmbed is needed, <code>false</code> otherwise
1177      */
1178     public static boolean needsXEmbed() {
1179         String noxembed = AccessController.
1180             doPrivileged(new GetPropertyAction("sun.awt.noxembed", "false"));
1181         if ("true".equals(noxembed)) {
1182             return false;
1183         }
1184 
1185         Toolkit tk = Toolkit.getDefaultToolkit();
1186         if (tk instanceof SunToolkit) {
1187             // SunToolkit descendants should override this method to specify
1188             // concrete behavior
1189             return ((SunToolkit)tk).needsXEmbedImpl();
1190         } else {
1191             // Non-SunToolkit doubtly might support XEmbed
1192             return false;
1193         }
1194     }
1195 
1196     /**
1197      * Returns whether this toolkit needs the support of the xembed
1198      * from embedding host(if any).
1199      * @return <code>true</code>, if XEmbed is needed, <code>false</code> otherwise
1200      */
1201     protected boolean needsXEmbedImpl() {
1202         return false;
1203     }
1204 
1205     private static Dialog.ModalExclusionType DEFAULT_MODAL_EXCLUSION_TYPE = null;
1206 
1207     /**
1208      * Returns whether the XEmbed server feature is requested by
1209      * developer.  If true, Toolkit should return an
1210      * XEmbed-server-enabled CanvasPeer instead of the ordinary CanvasPeer.
1211      */
1212     protected final boolean isXEmbedServerRequested() {
1213         return AccessController.doPrivileged(new GetBooleanAction("sun.awt.xembedserver"));
1214     }
1215 
1216     /**
1217      * Returns whether the modal exclusion API is supported by the current toolkit.
1218      * When it isn't supported, calling <code>setModalExcluded</code> has no
1219      * effect, and <code>isModalExcluded</code> returns false for all windows.
1220      *
1221      * @return true if modal exclusion is supported by the toolkit, false otherwise
1222      *
1223      * @see sun.awt.SunToolkit#setModalExcluded(java.awt.Window)
1224      * @see sun.awt.SunToolkit#isModalExcluded(java.awt.Window)
1225      *
1226      * @since 1.5
1227      */
1228     public static boolean isModalExcludedSupported()
1229     {
1230         Toolkit tk = Toolkit.getDefaultToolkit();
1231         return tk.isModalExclusionTypeSupported(DEFAULT_MODAL_EXCLUSION_TYPE);
1232     }
1233     /*
1234      * Default implementation for isModalExcludedSupportedImpl(), returns false.
1235      *
1236      * @see sun.awt.windows.WToolkit#isModalExcludeSupportedImpl
1237      * @see sun.awt.X11.XToolkit#isModalExcludeSupportedImpl
1238      *
1239      * @since 1.5
1240      */
1241     protected boolean isModalExcludedSupportedImpl()
1242     {
1243         return false;
1244     }
1245 
1246     /*
1247      * Sets this window to be excluded from being modally blocked. When the
1248      * toolkit supports modal exclusion and this method is called, input
1249      * events, focus transfer and z-order will continue to work for the
1250      * window, it's owned windows and child components, even in the
1251      * presence of a modal dialog.
1252      * For details on which <code>Window</code>s are normally blocked
1253      * by modal dialog, see {@link java.awt.Dialog}.
1254      * Invoking this method when the modal exclusion API is not supported by
1255      * the current toolkit has no effect.
1256      * @param window Window to be marked as not modally blocked
1257      * @see java.awt.Dialog
1258      * @see java.awt.Dialog#setModal(boolean)
1259      * @see sun.awt.SunToolkit#isModalExcludedSupported
1260      * @see sun.awt.SunToolkit#isModalExcluded(java.awt.Window)
1261      */
1262     public static void setModalExcluded(Window window)
1263     {
1264         if (DEFAULT_MODAL_EXCLUSION_TYPE == null) {
1265             DEFAULT_MODAL_EXCLUSION_TYPE = Dialog.ModalExclusionType.APPLICATION_EXCLUDE;
1266         }
1267         window.setModalExclusionType(DEFAULT_MODAL_EXCLUSION_TYPE);
1268     }
1269 
1270     /*
1271      * Returns whether the specified window is blocked by modal dialogs.
1272      * If the modal exclusion API isn't supported by the current toolkit,
1273      * it returns false for all windows.
1274      *
1275      * @param window Window to test for modal exclusion
1276      *
1277      * @return true if the window is modal excluded, false otherwise. If
1278      * the modal exclusion isn't supported by the current Toolkit, false
1279      * is returned
1280      *
1281      * @see sun.awt.SunToolkit#isModalExcludedSupported
1282      * @see sun.awt.SunToolkit#setModalExcluded(java.awt.Window)
1283      *
1284      * @since 1.5
1285      */
1286     public static boolean isModalExcluded(Window window)
1287     {
1288         if (DEFAULT_MODAL_EXCLUSION_TYPE == null) {
1289             DEFAULT_MODAL_EXCLUSION_TYPE = Dialog.ModalExclusionType.APPLICATION_EXCLUDE;
1290         }
1291         return window.getModalExclusionType().compareTo(DEFAULT_MODAL_EXCLUSION_TYPE) >= 0;
1292     }
1293 
1294     /**
1295      * Overridden in XToolkit and WToolkit
1296      */
1297     @Override
1298     public boolean isModalityTypeSupported(Dialog.ModalityType modalityType) {
1299         return (modalityType == Dialog.ModalityType.MODELESS) ||
1300                (modalityType == Dialog.ModalityType.APPLICATION_MODAL);
1301     }
1302 
1303     /**
1304      * Overridden in XToolkit and WToolkit
1305      */
1306     @Override
1307     public boolean isModalExclusionTypeSupported(Dialog.ModalExclusionType exclusionType) {
1308         return (exclusionType == Dialog.ModalExclusionType.NO_EXCLUDE);
1309     }
1310 
1311     ///////////////////////////////////////////////////////////////////////////
1312     //
1313     // The following is used by the Java Plug-in to coordinate dialog modality
1314     // between containing applications (browsers, ActiveX containers etc) and
1315     // the AWT.
1316     //
1317     ///////////////////////////////////////////////////////////////////////////
1318 
1319     private ModalityListenerList modalityListeners = new ModalityListenerList();
1320 
1321     public void addModalityListener(ModalityListener listener) {
1322         modalityListeners.add(listener);
1323     }
1324 
1325     public void removeModalityListener(ModalityListener listener) {
1326         modalityListeners.remove(listener);
1327     }
1328 
1329     public void notifyModalityPushed(Dialog dialog) {
1330         notifyModalityChange(ModalityEvent.MODALITY_PUSHED, dialog);
1331     }
1332 
1333     public void notifyModalityPopped(Dialog dialog) {
1334         notifyModalityChange(ModalityEvent.MODALITY_POPPED, dialog);
1335     }
1336 
1337     final void notifyModalityChange(int id, Dialog source) {
1338         ModalityEvent ev = new ModalityEvent(source, modalityListeners, id);
1339         ev.dispatch();
1340     }
1341 
1342     static class ModalityListenerList implements ModalityListener {
1343 
1344         Vector<ModalityListener> listeners = new Vector<ModalityListener>();
1345 
1346         void add(ModalityListener listener) {
1347             listeners.addElement(listener);
1348         }
1349 
1350         void remove(ModalityListener listener) {
1351             listeners.removeElement(listener);
1352         }
1353 
1354         @Override
1355         public void modalityPushed(ModalityEvent ev) {
1356             Iterator<ModalityListener> it = listeners.iterator();
1357             while (it.hasNext()) {
1358                 it.next().modalityPushed(ev);
1359             }
1360         }
1361 
1362         @Override
1363         public void modalityPopped(ModalityEvent ev) {
1364             Iterator<ModalityListener> it = listeners.iterator();
1365             while (it.hasNext()) {
1366                 it.next().modalityPopped(ev);
1367             }
1368         }
1369     } // end of class ModalityListenerList
1370 
1371     ///////////////////////////////////////////////////////////////////////////
1372     // End Plug-in code
1373     ///////////////////////////////////////////////////////////////////////////
1374 
1375     public static boolean isLightweightOrUnknown(Component comp) {
1376         if (comp.isLightweight()
1377             || !(getDefaultToolkit() instanceof SunToolkit))
1378         {
1379             return true;
1380         }
1381         return !(comp instanceof Button
1382             || comp instanceof Canvas
1383             || comp instanceof Checkbox
1384             || comp instanceof Choice
1385             || comp instanceof Label
1386             || comp instanceof java.awt.List
1387             || comp instanceof Panel
1388             || comp instanceof Scrollbar
1389             || comp instanceof ScrollPane
1390             || comp instanceof TextArea
1391             || comp instanceof TextField
1392             || comp instanceof Window);
1393     }
1394 
1395     @SuppressWarnings("serial")
1396     public static class OperationTimedOut extends RuntimeException {
1397         public OperationTimedOut(String msg) {
1398             super(msg);
1399         }
1400         public OperationTimedOut() {
1401         }
1402     }
1403 
1404     @SuppressWarnings("serial")
1405     public static class InfiniteLoop extends RuntimeException {
1406     }
1407 
1408     @SuppressWarnings("serial")
1409     public static class IllegalThreadException extends RuntimeException {
1410         public IllegalThreadException(String msg) {
1411             super(msg);
1412         }
1413         public IllegalThreadException() {
1414         }
1415     }
1416 
1417     public static final int DEFAULT_WAIT_TIME = 10000;
1418     private static final int MAX_ITERS = 20;
1419     private static final int MIN_ITERS = 0;
1420     private static final int MINIMAL_EDELAY = 0;
1421 
1422     /**
1423      * Parameterless version of realsync which uses default timout (see DEFAUL_WAIT_TIME).
1424      */
1425     public void realSync() throws OperationTimedOut, InfiniteLoop {
1426         realSync(DEFAULT_WAIT_TIME);
1427     }
1428 
1429     /**
1430      * Forces toolkit to synchronize with the native windowing
1431      * sub-system, flushing all pending work and waiting for all the
1432      * events to be processed.  This method guarantees that after
1433      * return no additional Java events will be generated, unless
1434      * cause by user. Obviously, the method cannot be used on the
1435      * event dispatch thread (EDT). In case it nevertheless gets
1436      * invoked on this thread, the method throws the
1437      * IllegalThreadException runtime exception.
1438      *
1439      * <p> This method allows to write tests without explicit timeouts
1440      * or wait for some event.  Example:
1441      * <code>
1442      * Frame f = ...;
1443      * f.setVisible(true);
1444      * ((SunToolkit)Toolkit.getDefaultToolkit()).realSync();
1445      * </code>
1446      *
1447      * <p> After realSync, <code>f</code> will be completely visible
1448      * on the screen, its getLocationOnScreen will be returning the
1449      * right result and it will be the focus owner.
1450      *
1451      * <p> Another example:
1452      * <code>
1453      * b.requestFocus();
1454      * ((SunToolkit)Toolkit.getDefaultToolkit()).realSync();
1455      * </code>
1456      *
1457      * <p> After realSync, <code>b</code> will be focus owner.
1458      *
1459      * <p> Notice that realSync isn't guaranteed to work if recurring
1460      * actions occur, such as if during processing of some event
1461      * another request which may generate some events occurs.  By
1462      * default, sync tries to perform as much as {@value #MAX_ITERS}
1463      * cycles of event processing, allowing for roughly {@value
1464      * #MAX_ITERS} additional requests.
1465      *
1466      * <p> For example, requestFocus() generates native request, which
1467      * generates one or two Java focus events, which then generate a
1468      * serie of paint events, a serie of Java focus events, which then
1469      * generate a serie of paint events which then are processed -
1470      * three cycles, minimum.
1471      *
1472      * @param timeout the maximum time to wait in milliseconds, negative means "forever".
1473      */
1474     public void realSync(final long timeout) throws OperationTimedOut, InfiniteLoop
1475     {
1476         if (EventQueue.isDispatchThread()) {
1477             throw new IllegalThreadException("The SunToolkit.realSync() method cannot be used on the event dispatch thread (EDT).");
1478         }
1479         int bigLoop = 0;
1480         do {
1481             // Let's do sync first
1482             sync();
1483 
1484             // During the wait process, when we were processing incoming
1485             // events, we could have made some new request, which can
1486             // generate new events.  Example: MapNotify/XSetInputFocus.
1487             // Therefore, we dispatch them as long as there is something
1488             // to dispatch.
1489             int iters = 0;
1490             while (iters < MIN_ITERS) {
1491                 syncNativeQueue(timeout);
1492                 iters++;
1493             }
1494             while (syncNativeQueue(timeout) && iters < MAX_ITERS) {
1495                 iters++;
1496             }
1497             if (iters >= MAX_ITERS) {
1498                 throw new InfiniteLoop();
1499             }
1500 
1501             // native requests were dispatched by X/Window Manager or Windows
1502             // Moreover, we processed them all on Toolkit thread
1503             // Now wait while EDT processes them.
1504             //
1505             // During processing of some events (focus, for example),
1506             // some other events could have been generated.  So, after
1507             // waitForIdle, we may end up with full EventQueue
1508             iters = 0;
1509             while (iters < MIN_ITERS) {
1510                 waitForIdle(timeout);
1511                 iters++;
1512             }
1513             while (waitForIdle(timeout) && iters < MAX_ITERS) {
1514                 iters++;
1515             }
1516             if (iters >= MAX_ITERS) {
1517                 throw new InfiniteLoop();
1518             }
1519 
1520             bigLoop++;
1521             // Again, for Java events, it was simple to check for new Java
1522             // events by checking event queue, but what if Java events
1523             // resulted in native requests?  Therefor, check native events again.
1524         } while ((syncNativeQueue(timeout) || waitForIdle(timeout)) && bigLoop < MAX_ITERS);
1525     }
1526 
1527     /**
1528      * Platform toolkits need to implement this method to perform the
1529      * sync of the native queue.  The method should wait until native
1530      * requests are processed, all native events are processed and
1531      * corresponding Java events are generated.  Should return
1532      * <code>true</code> if some events were processed,
1533      * <code>false</code> otherwise.
1534      */
1535     protected abstract boolean syncNativeQueue(final long timeout);
1536 
1537     private boolean eventDispatched = false;
1538     private boolean queueEmpty = false;
1539     private final Object waitLock = "Wait Lock";
1540 
1541     private boolean isEQEmpty() {
1542         EventQueue queue = getSystemEventQueueImpl();
1543         return AWTAccessor.getEventQueueAccessor().noEvents(queue);
1544     }
1545 
1546     /**
1547      * Waits for the Java event queue to empty.  Ensures that all
1548      * events are processed (including paint events), and that if
1549      * recursive events were generated, they are also processed.
1550      * Should return <code>true</code> if more processing is
1551      * necessary, <code>false</code> otherwise.
1552      */
1553     @SuppressWarnings("serial")
1554     protected final boolean waitForIdle(final long timeout) {
1555         flushPendingEvents();
1556         boolean queueWasEmpty = isEQEmpty();
1557         queueEmpty = false;
1558         eventDispatched = false;
1559         synchronized(waitLock) {
1560             postEvent(AppContext.getAppContext(),
1561                       new PeerEvent(getSystemEventQueueImpl(), null, PeerEvent.LOW_PRIORITY_EVENT) {
1562                           @Override
1563                           public void dispatch() {
1564                               // Here we block EDT.  It could have some
1565                               // events, it should have dispatched them by
1566                               // now.  So native requests could have been
1567                               // generated.  First, dispatch them.  Then,
1568                               // flush Java events again.
1569                               int iters = 0;
1570                               while (iters < MIN_ITERS) {
1571                                   syncNativeQueue(timeout);
1572                                   iters++;
1573                               }
1574                               while (syncNativeQueue(timeout) && iters < MAX_ITERS) {
1575                                   iters++;
1576                               }
1577                               flushPendingEvents();
1578 
1579                               synchronized(waitLock) {
1580                                   queueEmpty = isEQEmpty();
1581                                   eventDispatched = true;
1582                                   waitLock.notifyAll();
1583                               }
1584                           }
1585                       });
1586             try {
1587                 while (!eventDispatched) {
1588                     waitLock.wait();
1589                 }
1590             } catch (InterruptedException ie) {
1591                 return false;
1592             }
1593         }
1594 
1595         try {
1596             Thread.sleep(MINIMAL_EDELAY);
1597         } catch (InterruptedException ie) {
1598             throw new RuntimeException("Interrupted");
1599         }
1600 
1601         flushPendingEvents();
1602 
1603         // Lock to force write-cache flush for queueEmpty.
1604         synchronized (waitLock) {
1605             return !(queueEmpty && isEQEmpty() && queueWasEmpty);
1606         }
1607     }
1608 
1609     /**
1610      * Grabs the mouse input for the given window.  The window must be
1611      * visible.  The window or its children do not receive any
1612      * additional mouse events besides those targeted to them.  All
1613      * other events will be dispatched as before - to the respective
1614      * targets.  This Window will receive UngrabEvent when automatic
1615      * ungrab is about to happen.  The event can be listened to by
1616      * installing AWTEventListener with WINDOW_EVENT_MASK.  See
1617      * UngrabEvent class for the list of conditions when ungrab is
1618      * about to happen.
1619      * @see UngrabEvent
1620      */
1621     public abstract void grab(Window w);
1622 
1623     /**
1624      * Forces ungrab.  No event will be sent.
1625      */
1626     public abstract void ungrab(Window w);
1627 
1628 
1629     /**
1630      * Locates the splash screen library in a platform dependent way and closes
1631      * the splash screen. Should be invoked on first top-level frame display.
1632      * @see java.awt.SplashScreen
1633      * @since 1.6
1634      */
1635     public static native void closeSplashScreen();
1636 
1637     /* The following methods and variables are to support retrieving
1638      * desktop text anti-aliasing settings
1639      */
1640 
1641     /* Need an instance method because setDesktopProperty(..) is protected. */
1642     private void fireDesktopFontPropertyChanges() {
1643         setDesktopProperty(SunToolkit.DESKTOPFONTHINTS,
1644                            SunToolkit.getDesktopFontHints());
1645     }
1646 
1647     private static boolean checkedSystemAAFontSettings;
1648     private static boolean useSystemAAFontSettings;
1649     private static boolean lastExtraCondition = true;
1650     private static RenderingHints desktopFontHints;
1651 
1652     /* Since Swing is the reason for this "extra condition" logic its
1653      * worth documenting it in some detail.
1654      * First, a goal is for Swing and applications to both retrieve and
1655      * use the same desktop property value so that there is complete
1656      * consistency between the settings used by JDK's Swing implementation
1657      * and 3rd party custom Swing components, custom L&Fs and any general
1658      * text rendering that wants to be consistent with these.
1659      * But by default on Solaris & Linux Swing will not use AA text over
1660      * remote X11 display (unless Xrender can be used which is TBD and may not
1661      * always be available anyway) as that is a noticeable performance hit.
1662      * So there needs to be a way to express that extra condition so that
1663      * it is seen by all clients of the desktop property API.
1664      * If this were the only condition it could be handled here as it would
1665      * be the same for any L&F and could reasonably be considered to be
1666      * a static behaviour of those systems.
1667      * But GTK currently has an additional test based on locale which is
1668      * not applied by Metal. So mixing GTK in a few locales with Metal
1669      * would mean the last one wins.
1670      * This could be stored per-app context which would work
1671      * for different applets, but wouldn't help for a single application
1672      * using GTK and some other L&F concurrently.
1673      * But it is expected this will be addressed within GTK and the font
1674      * system so is a temporary and somewhat unlikely harmless corner case.
1675      */
1676     public static void setAAFontSettingsCondition(boolean extraCondition) {
1677         if (extraCondition != lastExtraCondition) {
1678             lastExtraCondition = extraCondition;
1679             if (checkedSystemAAFontSettings) {
1680                 /* Someone already asked for this info, under a different
1681                  * condition.
1682                  * We'll force re-evaluation instead of replicating the
1683                  * logic, then notify any listeners of any change.
1684                  */
1685                 checkedSystemAAFontSettings = false;
1686                 Toolkit tk = Toolkit.getDefaultToolkit();
1687                 if (tk instanceof SunToolkit) {
1688                      ((SunToolkit)tk).fireDesktopFontPropertyChanges();
1689                 }
1690             }
1691         }
1692     }
1693 
1694     /* "false", "off", ""default" aren't explicitly tested, they
1695      * just fall through to produce a null return which all are equated to
1696      * "false".
1697      */
1698     private static RenderingHints getDesktopAAHintsByName(String hintname) {
1699         Object aaHint = null;
1700         hintname = hintname.toLowerCase(Locale.ENGLISH);
1701         if (hintname.equals("on")) {
1702             aaHint = VALUE_TEXT_ANTIALIAS_ON;
1703         } else if (hintname.equals("gasp")) {
1704             aaHint = VALUE_TEXT_ANTIALIAS_GASP;
1705         } else if (hintname.equals("lcd") || hintname.equals("lcd_hrgb")) {
1706             aaHint = VALUE_TEXT_ANTIALIAS_LCD_HRGB;
1707         } else if (hintname.equals("lcd_hbgr")) {
1708             aaHint = VALUE_TEXT_ANTIALIAS_LCD_HBGR;
1709         } else if (hintname.equals("lcd_vrgb")) {
1710             aaHint = VALUE_TEXT_ANTIALIAS_LCD_VRGB;
1711         } else if (hintname.equals("lcd_vbgr")) {
1712             aaHint = VALUE_TEXT_ANTIALIAS_LCD_VBGR;
1713         }
1714         if (aaHint != null) {
1715             RenderingHints map = new RenderingHints(null);
1716             map.put(KEY_TEXT_ANTIALIASING, aaHint);
1717             return map;
1718         } else {
1719             return null;
1720         }
1721     }
1722 
1723     /* This method determines whether to use the system font settings,
1724      * or ignore them if a L&F has specified they should be ignored, or
1725      * to override both of these with a system property specified value.
1726      * If the toolkit isn't a SunToolkit, (eg may be headless) then that
1727      * system property isn't applied as desktop properties are considered
1728      * to be inapplicable in that case. In that headless case although
1729      * this method will return "true" the toolkit will return a null map.
1730      */
1731     private static boolean useSystemAAFontSettings() {
1732         if (!checkedSystemAAFontSettings) {
1733             useSystemAAFontSettings = true; /* initially set this true */
1734             String systemAAFonts = null;
1735             Toolkit tk = Toolkit.getDefaultToolkit();
1736             if (tk instanceof SunToolkit) {
1737                 systemAAFonts =
1738                     AccessController.doPrivileged(
1739                          new GetPropertyAction("awt.useSystemAAFontSettings"));
1740             }
1741             if (systemAAFonts != null) {
1742                 useSystemAAFontSettings =
1743                     Boolean.valueOf(systemAAFonts).booleanValue();
1744                 /* If it is anything other than "true", then it may be
1745                  * a hint name , or it may be "off, "default", etc.
1746                  */
1747                 if (!useSystemAAFontSettings) {
1748                     desktopFontHints = getDesktopAAHintsByName(systemAAFonts);
1749                 }
1750             }
1751             /* If its still true, apply the extra condition */
1752             if (useSystemAAFontSettings) {
1753                  useSystemAAFontSettings = lastExtraCondition;
1754             }
1755             checkedSystemAAFontSettings = true;
1756         }
1757         return useSystemAAFontSettings;
1758     }
1759 
1760     /* A variable defined for the convenience of JDK code */
1761     public static final String DESKTOPFONTHINTS = "awt.font.desktophints";
1762 
1763     /* Overridden by subclasses to return platform/desktop specific values */
1764     protected RenderingHints getDesktopAAHints() {
1765         return null;
1766     }
1767 
1768     /* Subclass desktop property loading methods call this which
1769      * in turn calls the appropriate subclass implementation of
1770      * getDesktopAAHints() when system settings are being used.
1771      * Its public rather than protected because subclasses may delegate
1772      * to a helper class.
1773      */
1774     public static RenderingHints getDesktopFontHints() {
1775         if (useSystemAAFontSettings()) {
1776              Toolkit tk = Toolkit.getDefaultToolkit();
1777              if (tk instanceof SunToolkit) {
1778                  Object map = ((SunToolkit)tk).getDesktopAAHints();
1779                  return (RenderingHints)map;
1780              } else { /* Headless Toolkit */
1781                  return null;
1782              }
1783         } else if (desktopFontHints != null) {
1784             /* cloning not necessary as the return value is cloned later, but
1785              * its harmless.
1786              */
1787             return (RenderingHints)(desktopFontHints.clone());
1788         } else {
1789             return null;
1790         }
1791     }
1792 
1793 
1794     public abstract boolean isDesktopSupported();
1795     public abstract boolean isTaskbarSupported();
1796 
1797     /*
1798      * consumeNextKeyTyped() method is not currently used,
1799      * however Swing could use it in the future.
1800      */
1801     public static synchronized void consumeNextKeyTyped(KeyEvent keyEvent) {
1802         try {
1803             AWTAccessor.getDefaultKeyboardFocusManagerAccessor().consumeNextKeyTyped(
1804                 (DefaultKeyboardFocusManager)KeyboardFocusManager.
1805                     getCurrentKeyboardFocusManager(),
1806                 keyEvent);
1807         } catch (ClassCastException cce) {
1808              cce.printStackTrace();
1809         }
1810     }
1811 
1812     protected static void dumpPeers(final PlatformLogger aLog) {
1813         AWTAutoShutdown.getInstance().dumpPeers(aLog);
1814     }
1815 
1816     /**
1817      * Returns the <code>Window</code> ancestor of the component <code>comp</code>.
1818      * @return Window ancestor of the component or component by itself if it is Window;
1819      *         null, if component is not a part of window hierarchy
1820      */
1821     public static Window getContainingWindow(Component comp) {
1822         while (comp != null && !(comp instanceof Window)) {
1823             comp = comp.getParent();
1824         }
1825         return (Window)comp;
1826     }
1827 
1828     private static Boolean sunAwtDisableMixing = null;
1829 
1830     /**
1831      * Returns the value of "sun.awt.disableMixing" property. Default
1832      * value is {@code false}.
1833      */
1834     public static synchronized boolean getSunAwtDisableMixing() {
1835         if (sunAwtDisableMixing == null) {
1836             sunAwtDisableMixing = AccessController.doPrivileged(
1837                                       new GetBooleanAction("sun.awt.disableMixing"));
1838         }
1839         return sunAwtDisableMixing.booleanValue();
1840     }
1841 
1842     /**
1843      * Returns true if the native GTK libraries are available.  The
1844      * default implementation returns false, but UNIXToolkit overrides this
1845      * method to provide a more specific answer.
1846      */
1847     public boolean isNativeGTKAvailable() {
1848         return false;
1849     }
1850 
1851     private static final Object DEACTIVATION_TIMES_MAP_KEY = new Object();
1852 
1853     public synchronized void setWindowDeactivationTime(Window w, long time) {
1854         AppContext ctx = getAppContext(w);
1855         if (ctx == null) {
1856             return;
1857         }
1858         @SuppressWarnings("unchecked")
1859         WeakHashMap<Window, Long> map = (WeakHashMap<Window, Long>)ctx.get(DEACTIVATION_TIMES_MAP_KEY);
1860         if (map == null) {
1861             map = new WeakHashMap<Window, Long>();
1862             ctx.put(DEACTIVATION_TIMES_MAP_KEY, map);
1863         }
1864         map.put(w, time);
1865     }
1866 
1867     public synchronized long getWindowDeactivationTime(Window w) {
1868         AppContext ctx = getAppContext(w);
1869         if (ctx == null) {
1870             return -1;
1871         }
1872         @SuppressWarnings("unchecked")
1873         WeakHashMap<Window, Long> map = (WeakHashMap<Window, Long>)ctx.get(DEACTIVATION_TIMES_MAP_KEY);
1874         if (map == null) {
1875             return -1;
1876         }
1877         Long time = map.get(w);
1878         return time == null ? -1 : time;
1879     }
1880 
1881     // Cosntant alpha
1882     public boolean isWindowOpacitySupported() {
1883         return false;
1884     }
1885 
1886     // Shaping
1887     public boolean isWindowShapingSupported() {
1888         return false;
1889     }
1890 
1891     // Per-pixel alpha
1892     public boolean isWindowTranslucencySupported() {
1893         return false;
1894     }
1895 
1896     public boolean isTranslucencyCapable(GraphicsConfiguration gc) {
1897         return false;
1898     }
1899 
1900     /**
1901      * Returns true if swing backbuffer should be translucent.
1902      */
1903     public boolean isSwingBackbufferTranslucencySupported() {
1904         return false;
1905     }
1906 
1907     /**
1908      * Returns whether or not a containing top level window for the passed
1909      * component is
1910      * {@link GraphicsDevice.WindowTranslucency#PERPIXEL_TRANSLUCENT PERPIXEL_TRANSLUCENT}.
1911      *
1912      * @param c a Component which toplevel's to check
1913      * @return {@code true}  if the passed component is not null and has a
1914      * containing toplevel window which is opaque (so per-pixel translucency
1915      * is not enabled), {@code false} otherwise
1916      * @see GraphicsDevice.WindowTranslucency#PERPIXEL_TRANSLUCENT
1917      */
1918     public static boolean isContainingTopLevelOpaque(Component c) {
1919         Window w = getContainingWindow(c);
1920         return w != null && w.isOpaque();
1921     }
1922 
1923     /**
1924      * Returns whether or not a containing top level window for the passed
1925      * component is
1926      * {@link GraphicsDevice.WindowTranslucency#TRANSLUCENT TRANSLUCENT}.
1927      *
1928      * @param c a Component which toplevel's to check
1929      * @return {@code true} if the passed component is not null and has a
1930      * containing toplevel window which has opacity less than
1931      * 1.0f (which means that it is translucent), {@code false} otherwise
1932      * @see GraphicsDevice.WindowTranslucency#TRANSLUCENT
1933      */
1934     public static boolean isContainingTopLevelTranslucent(Component c) {
1935         Window w = getContainingWindow(c);
1936         return w != null && w.getOpacity() < 1.0f;
1937     }
1938 
1939     /**
1940      * Returns whether the native system requires using the peer.updateWindow()
1941      * method to update the contents of a non-opaque window, or if usual
1942      * painting procedures are sufficient. The default return value covers
1943      * the X11 systems. On MS Windows this method is overriden in WToolkit
1944      * to return true.
1945      */
1946     public boolean needUpdateWindow() {
1947         return false;
1948     }
1949 
1950     /**
1951      * Descendants of the SunToolkit should override and put their own logic here.
1952      */
1953     public int getNumberOfButtons(){
1954         return 3;
1955     }
1956 
1957     /**
1958      * Checks that the given object implements/extends the given
1959      * interface/class.
1960      *
1961      * Note that using the instanceof operator causes a class to be loaded.
1962      * Using this method doesn't load a class and it can be used instead of
1963      * the instanceof operator for performance reasons.
1964      *
1965      * @param obj Object to be checked
1966      * @param type The name of the interface/class. Must be
1967      * fully-qualified interface/class name.
1968      * @return true, if this object implements/extends the given
1969      *         interface/class, false, otherwise, or if obj or type is null
1970      */
1971     public static boolean isInstanceOf(Object obj, String type) {
1972         if (obj == null) return false;
1973         if (type == null) return false;
1974 
1975         return isInstanceOf(obj.getClass(), type);
1976     }
1977 
1978     private static boolean isInstanceOf(Class<?> cls, String type) {
1979         if (cls == null) return false;
1980 
1981         if (cls.getName().equals(type)) {
1982             return true;
1983         }
1984 
1985         for (Class<?> c : cls.getInterfaces()) {
1986             if (c.getName().equals(type)) {
1987                 return true;
1988             }
1989         }
1990         return isInstanceOf(cls.getSuperclass(), type);
1991     }
1992 
1993     protected static LightweightFrame getLightweightFrame(Component c) {
1994         for (; c != null; c = c.getParent()) {
1995             if (c instanceof LightweightFrame) {
1996                 return (LightweightFrame)c;
1997             }
1998             if (c instanceof Window) {
1999                 // Don't traverse owner windows
2000                 return null;
2001             }
2002         }
2003         return null;
2004     }
2005 
2006     ///////////////////////////////////////////////////////////////////////////
2007     //
2008     // The following methods help set and identify whether a particular
2009     // AWTEvent object was produced by the system or by user code. As of this
2010     // writing the only consumer is the Java Plug-In, although this information
2011     // could be useful to more clients and probably should be formalized in
2012     // the public API.
2013     //
2014     ///////////////////////////////////////////////////////////////////////////
2015 
2016     public static void setSystemGenerated(AWTEvent e) {
2017         AWTAccessor.getAWTEventAccessor().setSystemGenerated(e);
2018     }
2019 
2020     public static boolean isSystemGenerated(AWTEvent e) {
2021         return AWTAccessor.getAWTEventAccessor().isSystemGenerated(e);
2022     }
2023 
2024 } // class SunToolkit
2025 
2026 
2027 /*
2028  * PostEventQueue is a Thread that runs in the same AppContext as the
2029  * Java EventQueue.  It is a queue of AWTEvents to be posted to the
2030  * Java EventQueue.  The toolkit Thread (AWT-Windows/AWT-Motif) posts
2031  * events to this queue, which then calls EventQueue.postEvent().
2032  *
2033  * We do this because EventQueue.postEvent() may be overridden by client
2034  * code, and we mustn't ever call client code from the toolkit thread.
2035  */
2036 class PostEventQueue {
2037     private EventQueueItem queueHead = null;
2038     private EventQueueItem queueTail = null;
2039     private final EventQueue eventQueue;
2040 
2041     private Thread flushThread = null;
2042 
2043     PostEventQueue(EventQueue eq) {
2044         eventQueue = eq;
2045     }
2046 
2047     /*
2048      * Continually post pending AWTEvents to the Java EventQueue. The method
2049      * is synchronized to ensure the flush is completed before a new event
2050      * can be posted to this queue.
2051      *
2052      * 7177040: The method couldn't be wholly synchronized because of calls
2053      * of EventQueue.postEvent() that uses pushPopLock, otherwise it could
2054      * potentially lead to deadlock
2055      */
2056     public void flush() {
2057 
2058         Thread newThread = Thread.currentThread();
2059 
2060         try {
2061             EventQueueItem tempQueue;
2062             synchronized (this) {
2063                 // Avoid method recursion
2064                 if (newThread == flushThread) {
2065                     return;
2066                 }
2067                 // Wait for other threads' flushing
2068                 while (flushThread != null) {
2069                     wait();
2070                 }
2071                 // Skip everything if queue is empty
2072                 if (queueHead == null) {
2073                     return;
2074                 }
2075                 // Remember flushing thread
2076                 flushThread = newThread;
2077 
2078                 tempQueue = queueHead;
2079                 queueHead = queueTail = null;
2080             }
2081             try {
2082                 while (tempQueue != null) {
2083                     eventQueue.postEvent(tempQueue.event);
2084                     tempQueue = tempQueue.next;
2085                 }
2086             }
2087             finally {
2088                 // Only the flushing thread can get here
2089                 synchronized (this) {
2090                     // Forget flushing thread, inform other pending threads
2091                     flushThread = null;
2092                     notifyAll();
2093                 }
2094             }
2095         }
2096         catch (InterruptedException e) {
2097             // Couldn't allow exception go up, so at least recover the flag
2098             newThread.interrupt();
2099         }
2100     }
2101 
2102     /*
2103      * Enqueue an AWTEvent to be posted to the Java EventQueue.
2104      */
2105     void postEvent(AWTEvent event) {
2106         EventQueueItem item = new EventQueueItem(event);
2107 
2108         synchronized (this) {
2109             if (queueHead == null) {
2110                 queueHead = queueTail = item;
2111             } else {
2112                 queueTail.next = item;
2113                 queueTail = item;
2114             }
2115         }
2116         SunToolkit.wakeupEventQueue(eventQueue, event.getSource() == AWTAutoShutdown.getInstance());
2117     }
2118 } // class PostEventQueue