1 /*
2 * Copyright (c) 1997, 2016, 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.SystemTrayPeer;
41 import java.awt.peer.TrayIconPeer;
42 import java.io.File;
43 import java.io.IOException;
44 import java.io.InputStream;
45 import java.lang.reflect.InvocationTargetException;
46 import java.net.URL;
47 import java.security.AccessController;
48 import java.util.Collections;
49 import java.util.Iterator;
50 import java.util.Locale;
51 import java.util.Map;
52 import java.util.Vector;
53 import java.util.WeakHashMap;
54 import java.util.concurrent.TimeUnit;
55 import java.util.concurrent.locks.Condition;
56 import java.util.concurrent.locks.ReentrantLock;
57
58 import sun.awt.im.InputContext;
59 import sun.awt.image.ByteArrayImageSource;
60 import sun.awt.image.FileImageSource;
61 import sun.awt.image.ImageRepresentation;
62 import java.awt.image.MultiResolutionImage;
63 import sun.awt.image.MultiResolutionToolkitImage;
64 import sun.awt.image.ToolkitImage;
65 import sun.awt.image.URLImageSource;
66 import sun.font.FontDesignMetrics;
67 import sun.net.util.URLUtil;
68 import sun.security.action.GetBooleanAction;
69 import sun.security.action.GetPropertyAction;
70 import sun.util.logging.PlatformLogger;
71 import java.util.Arrays;
72 import java.util.List;
73 import sun.awt.image.MultiResolutionToolkitImage.ResolutionVariantItem;
74
75 import static java.awt.RenderingHints.*;
76
77 public abstract class SunToolkit extends Toolkit
78 implements ComponentFactory, InputMethodSupport, KeyboardFocusManagerPeerProvider {
79
80 // 8014718: logging has been removed from SunToolkit
81
82 /* Load debug settings for native code */
83 static {
84 if (AccessController.doPrivileged(new GetBooleanAction("sun.awt.nativedebug"))) {
85 DebugSettings.init();
86 }
87 };
88
89 /**
90 * Special mask for the UngrabEvent events, in addition to the
91 * public masks defined in AWTEvent. Should be used as the mask
92 * value for Toolkit.addAWTEventListener.
93 */
94 public static final int GRAB_EVENT_MASK = 0x80000000;
95
96 /* The key to put()/get() the PostEventQueue into/from the AppContext.
97 */
98 private static final String POST_EVENT_QUEUE_KEY = "PostEventQueue";
99
100 /**
101 * Number of buttons.
102 * By default it's taken from the system. If system value does not
103 * fit into int type range, use our own MAX_BUTTONS_SUPPORT value.
104 */
105 protected static int numberOfButtons = 0;
106
107
108 /* XFree standard mention 24 buttons as maximum:
109 * http://www.xfree86.org/current/mouse.4.html
110 * We workaround systems supporting more than 24 buttons.
111 * Otherwise, we have to use long type values as masks
112 * which leads to API change.
113 * InputEvent.BUTTON_DOWN_MASK may contain only 21 masks due to
114 * the 4-bytes limit for the int type. (CR 6799099)
115 * One more bit is reserved for FIRST_HIGH_BIT.
116 */
117 public static final int MAX_BUTTONS_SUPPORTED = 20;
118
119 /**
120 * Creates and initializes EventQueue instance for the specified
121 * AppContext.
122 * Note that event queue must be created from createNewAppContext()
123 * only in order to ensure that EventQueue constructor obtains
124 * the correct AppContext.
125 * @param appContext AppContext to associate with the event queue
126 */
127 private static void initEQ(AppContext appContext) {
128 EventQueue eventQueue = new EventQueue();
129 appContext.put(AppContext.EVENT_QUEUE_KEY, eventQueue);
130
131 PostEventQueue postEventQueue = new PostEventQueue(eventQueue);
132 appContext.put(POST_EVENT_QUEUE_KEY, postEventQueue);
133 }
134
135 public SunToolkit() {
136 }
137
138 public boolean useBufferPerWindow() {
139 return false;
140 }
141
142 public abstract FramePeer createLightweightFrame(LightweightFrame target)
143 throws HeadlessException;
144
145 public abstract TrayIconPeer createTrayIcon(TrayIcon target)
146 throws HeadlessException, AWTException;
147
148 public abstract SystemTrayPeer createSystemTray(SystemTray target);
149
150 public abstract boolean isTraySupported();
151
152 @Override
153 public abstract KeyboardFocusManagerPeer getKeyboardFocusManagerPeer()
154 throws HeadlessException;
155
156 /**
157 * The AWT lock is typically only used on Unix platforms to synchronize
158 * access to Xlib, OpenGL, etc. However, these methods are implemented
159 * in SunToolkit so that they can be called from shared code (e.g.
160 * from the OGL pipeline) or from the X11 pipeline regardless of whether
161 * XToolkit or MToolkit is currently in use. There are native macros
162 * (such as AWT_LOCK) defined in awt.h, so if the implementation of these
163 * methods is changed, make sure it is compatible with the native macros.
164 *
165 * Note: The following methods (awtLock(), awtUnlock(), etc) should be
166 * used in place of:
167 * synchronized (getAWTLock()) {
168 * ...
169 * }
170 *
171 * By factoring these methods out specially, we are able to change the
172 * implementation of these methods (e.g. use more advanced locking
173 * mechanisms) without impacting calling code.
174 *
175 * Sample usage:
176 * private void doStuffWithXlib() {
177 * assert !SunToolkit.isAWTLockHeldByCurrentThread();
178 * SunToolkit.awtLock();
179 * try {
180 * ...
181 * XlibWrapper.XDoStuff();
182 * } finally {
183 * SunToolkit.awtUnlock();
184 * }
185 * }
186 */
187
188 private static final ReentrantLock AWT_LOCK = new ReentrantLock();
189 private static final Condition AWT_LOCK_COND = AWT_LOCK.newCondition();
190
191 public static final void awtLock() {
192 AWT_LOCK.lock();
193 }
194
195 public static final boolean awtTryLock() {
196 return AWT_LOCK.tryLock();
197 }
198
199 public static final void awtUnlock() {
200 AWT_LOCK.unlock();
201 }
202
203 public static final void awtLockWait()
204 throws InterruptedException
205 {
206 AWT_LOCK_COND.await();
207 }
208
209 public static final void awtLockWait(long timeout)
210 throws InterruptedException
211 {
212 AWT_LOCK_COND.await(timeout, TimeUnit.MILLISECONDS);
213 }
214
215 public static final void awtLockNotify() {
216 AWT_LOCK_COND.signal();
217 }
218
219 public static final void awtLockNotifyAll() {
220 AWT_LOCK_COND.signalAll();
221 }
222
223 public static final boolean isAWTLockHeldByCurrentThread() {
224 return AWT_LOCK.isHeldByCurrentThread();
225 }
226
227 /*
228 * Create a new AppContext, along with its EventQueue, for a
229 * new ThreadGroup. Browser code, for example, would use this
230 * method to create an AppContext & EventQueue for an Applet.
231 */
232 public static AppContext createNewAppContext() {
233 ThreadGroup threadGroup = Thread.currentThread().getThreadGroup();
234 return createNewAppContext(threadGroup);
235 }
236
237 static final AppContext createNewAppContext(ThreadGroup threadGroup) {
238 // Create appContext before initialization of EventQueue, so all
239 // the calls to AppContext.getAppContext() from EventQueue ctor
240 // return correct values
241 AppContext appContext = new AppContext(threadGroup);
242 initEQ(appContext);
243
244 return appContext;
245 }
246
247 static void wakeupEventQueue(EventQueue q, boolean isShutdown){
248 AWTAccessor.getEventQueueAccessor().wakeup(q, isShutdown);
249 }
250
251 /*
252 * Fetch the peer associated with the given target (as specified
253 * in the peer creation method). This can be used to determine
254 * things like what the parent peer is. If the target is null
255 * or the target can't be found (either because the a peer was
256 * never created for it or the peer was disposed), a null will
257 * be returned.
258 */
259 protected static Object targetToPeer(Object target) {
260 if (target != null && !GraphicsEnvironment.isHeadless()) {
261 return AWTAutoShutdown.getInstance().getPeer(target);
262 }
263 return null;
264 }
265
266 protected static void targetCreatedPeer(Object target, Object peer) {
267 if (target != null && peer != null &&
268 !GraphicsEnvironment.isHeadless())
269 {
270 AWTAutoShutdown.getInstance().registerPeer(target, peer);
271 }
272 }
273
274 protected static void targetDisposedPeer(Object target, Object peer) {
275 if (target != null && peer != null &&
276 !GraphicsEnvironment.isHeadless())
277 {
278 AWTAutoShutdown.getInstance().unregisterPeer(target, peer);
279 }
280 }
281
282 // Maps from non-Component/MenuComponent to AppContext.
283 // WeakHashMap<Component,AppContext>
284 private static final Map<Object, AppContext> appContextMap =
285 Collections.synchronizedMap(new WeakIdentityHashMap<Object, AppContext>());
286
287 /**
288 * Sets the appContext field of target. If target is not a Component or
289 * MenuComponent, this returns false.
290 */
291 private static boolean setAppContext(Object target,
292 AppContext context) {
293 if (target instanceof Component) {
294 AWTAccessor.getComponentAccessor().
295 setAppContext((Component)target, context);
296 } else if (target instanceof MenuComponent) {
297 AWTAccessor.getMenuComponentAccessor().
298 setAppContext((MenuComponent)target, context);
299 } else {
300 return false;
301 }
302 return true;
303 }
304
305 /**
306 * Returns the appContext field for target. If target is not a
307 * Component or MenuComponent this returns null.
308 */
309 private static AppContext getAppContext(Object target) {
310 if (target instanceof Component) {
311 return AWTAccessor.getComponentAccessor().
312 getAppContext((Component)target);
313 } else if (target instanceof MenuComponent) {
314 return AWTAccessor.getMenuComponentAccessor().
315 getAppContext((MenuComponent)target);
316 } else {
317 return null;
318 }
319 }
320
321 /*
322 * Fetch the AppContext associated with the given target.
323 * This can be used to determine things like which EventQueue
324 * to use for posting events to a Component. If the target is
325 * null or the target can't be found, a null with be returned.
326 */
327 public static AppContext targetToAppContext(Object target) {
328 if (target == null) {
329 return null;
330 }
331 AppContext context = getAppContext(target);
332 if (context == null) {
333 // target is not a Component/MenuComponent, try the
334 // appContextMap.
335 context = appContextMap.get(target);
336 }
337 return context;
338 }
339
340 /**
341 * Sets the synchronous status of focus requests on lightweight
342 * components in the specified window to the specified value.
343 * If the boolean parameter is {@code true} then the focus
344 * requests on lightweight components will be performed
345 * synchronously, if it is {@code false}, then asynchronously.
346 * By default, all windows have their lightweight request status
347 * set to asynchronous.
348 * <p>
349 * The application can only set the status of lightweight focus
350 * requests to synchronous for any of its windows if it doesn't
351 * perform focus transfers between different heavyweight containers.
352 * In this case the observable focus behaviour is the same as with
353 * asynchronous status.
354 * <p>
355 * If the application performs focus transfer between different
356 * heavyweight containers and sets the lightweight focus request
357 * status to synchronous for any of its windows, then further focus
358 * behaviour is unspecified.
359 * <p>
360 * @param changed the window for which the lightweight focus request
361 * status should be set
362 * @param status the value of lightweight focus request status
363 */
364
365 public static void setLWRequestStatus(Window changed,boolean status){
366 AWTAccessor.getWindowAccessor().setLWRequestStatus(changed, status);
367 };
368
369 public static void checkAndSetPolicy(Container cont) {
370 FocusTraversalPolicy defaultPolicy = KeyboardFocusManager.
371 getCurrentKeyboardFocusManager().
372 getDefaultFocusTraversalPolicy();
373
374 cont.setFocusTraversalPolicy(defaultPolicy);
375 }
376
377 private static FocusTraversalPolicy createLayoutPolicy() {
378 FocusTraversalPolicy policy = null;
379 try {
380 Class<?> layoutPolicyClass =
381 Class.forName("javax.swing.LayoutFocusTraversalPolicy");
382 policy = (FocusTraversalPolicy)layoutPolicyClass.newInstance();
383 }
384 catch (ClassNotFoundException e) {
385 assert false;
386 }
387 catch (InstantiationException e) {
388 assert false;
389 }
390 catch (IllegalAccessException e) {
391 assert false;
392 }
393
394 return policy;
395 }
396
397 /*
398 * Insert a mapping from target to AppContext, for later retrieval
399 * via targetToAppContext() above.
400 */
401 public static void insertTargetMapping(Object target, AppContext appContext) {
402 if (!setAppContext(target, appContext)) {
403 // Target is not a Component/MenuComponent, use the private Map
404 // instead.
405 appContextMap.put(target, appContext);
406 }
407 }
408
409 /*
410 * Post an AWTEvent to the Java EventQueue, using the PostEventQueue
411 * to avoid possibly calling client code (EventQueueSubclass.postEvent())
412 * on the toolkit (AWT-Windows/AWT-Motif) thread. This function should
413 * not be called under another lock since it locks the EventQueue.
414 * See bugids 4632918, 4526597.
415 */
416 public static void postEvent(AppContext appContext, AWTEvent event) {
417 if (event == null) {
418 throw new NullPointerException();
419 }
420
421 AWTAccessor.SequencedEventAccessor sea = AWTAccessor.getSequencedEventAccessor();
422 if (sea != null && sea.isSequencedEvent(event)) {
423 AWTEvent nested = sea.getNested(event);
424 if (nested.getID() == WindowEvent.WINDOW_LOST_FOCUS &&
425 nested instanceof TimedWindowEvent)
426 {
427 TimedWindowEvent twe = (TimedWindowEvent)nested;
428 ((SunToolkit)Toolkit.getDefaultToolkit()).
429 setWindowDeactivationTime((Window)twe.getSource(), twe.getWhen());
430 }
431 }
432
433 // All events posted via this method are system-generated.
434 // Placing the following call here reduces considerably the
435 // number of places throughout the toolkit that would
436 // otherwise have to be modified to precisely identify
437 // system-generated events.
438 setSystemGenerated(event);
439 AppContext eventContext = targetToAppContext(event.getSource());
440 if (eventContext != null && !eventContext.equals(appContext)) {
441 throw new RuntimeException("Event posted on wrong app context : " + event);
442 }
443 PostEventQueue postEventQueue =
444 (PostEventQueue)appContext.get(POST_EVENT_QUEUE_KEY);
445 if (postEventQueue != null) {
446 postEventQueue.postEvent(event);
447 }
448 }
449
450 /*
451 * Post AWTEvent of high priority.
452 */
453 public static void postPriorityEvent(final AWTEvent e) {
454 PeerEvent pe = new PeerEvent(Toolkit.getDefaultToolkit(), new Runnable() {
455 @Override
456 public void run() {
457 AWTAccessor.getAWTEventAccessor().setPosted(e);
458 ((Component)e.getSource()).dispatchEvent(e);
459 }
460 }, PeerEvent.ULTIMATE_PRIORITY_EVENT);
461 postEvent(targetToAppContext(e.getSource()), pe);
462 }
463
464 /*
465 * Flush any pending events which haven't been posted to the AWT
466 * EventQueue yet.
467 */
468 public static void flushPendingEvents() {
469 AppContext appContext = AppContext.getAppContext();
470 flushPendingEvents(appContext);
471 }
472
473 /*
474 * Flush the PostEventQueue for the right AppContext.
475 * The default flushPendingEvents only flushes the thread-local context,
476 * which is not always correct, c.f. 3746956
477 */
478 public static void flushPendingEvents(AppContext appContext) {
479 PostEventQueue postEventQueue =
480 (PostEventQueue)appContext.get(POST_EVENT_QUEUE_KEY);
481 if (postEventQueue != null) {
482 postEventQueue.flush();
483 }
484 }
485
486 /*
487 * Execute a chunk of code on the Java event handler thread for the
488 * given target. Does not wait for the execution to occur before
489 * returning to the caller.
490 */
491 public static void executeOnEventHandlerThread(Object target,
492 Runnable runnable) {
493 executeOnEventHandlerThread(new PeerEvent(target, runnable, PeerEvent.PRIORITY_EVENT));
494 }
495
496 /*
497 * Fixed 5064013: the InvocationEvent time should be equals
498 * the time of the ActionEvent
499 */
500 @SuppressWarnings("serial")
501 public static void executeOnEventHandlerThread(Object target,
502 Runnable runnable,
503 final long when) {
504 executeOnEventHandlerThread(
505 new PeerEvent(target, runnable, PeerEvent.PRIORITY_EVENT) {
506 @Override
507 public long getWhen() {
508 return when;
509 }
510 });
511 }
512
513 /*
514 * Execute a chunk of code on the Java event handler thread for the
515 * given target. Does not wait for the execution to occur before
516 * returning to the caller.
517 */
518 public static void executeOnEventHandlerThread(PeerEvent peerEvent) {
519 postEvent(targetToAppContext(peerEvent.getSource()), peerEvent);
520 }
521
522 /*
523 * Execute a chunk of code on the Java event handler thread. The
524 * method takes into account provided AppContext and sets
525 * {@code SunToolkit.getDefaultToolkit()} as a target of the
526 * event. See 6451487 for detailes.
527 * Does not wait for the execution to occur before returning to
528 * the caller.
529 */
530 public static void invokeLaterOnAppContext(
531 AppContext appContext, Runnable dispatcher)
532 {
533 postEvent(appContext,
534 new PeerEvent(Toolkit.getDefaultToolkit(), dispatcher,
535 PeerEvent.PRIORITY_EVENT));
536 }
537
538 /*
539 * Execute a chunk of code on the Java event handler thread for the
540 * given target. Waits for the execution to occur before returning
541 * to the caller.
542 */
543 public static void executeOnEDTAndWait(Object target, Runnable runnable)
544 throws InterruptedException, InvocationTargetException
545 {
546 if (EventQueue.isDispatchThread()) {
547 throw new Error("Cannot call executeOnEDTAndWait from any event dispatcher thread");
548 }
549
550 class AWTInvocationLock {}
551 Object lock = new AWTInvocationLock();
552
553 PeerEvent event = new PeerEvent(target, runnable, lock, true, PeerEvent.PRIORITY_EVENT);
554
555 synchronized (lock) {
556 executeOnEventHandlerThread(event);
557 while(!event.isDispatched()) {
558 lock.wait();
559 }
560 }
561
562 Throwable eventThrowable = event.getThrowable();
563 if (eventThrowable != null) {
564 throw new InvocationTargetException(eventThrowable);
565 }
566 }
567
568 /*
569 * Returns true if the calling thread is the event dispatch thread
570 * contained within AppContext which associated with the given target.
571 * Use this call to ensure that a given task is being executed
572 * (or not being) on the event dispatch thread for the given target.
573 */
574 public static boolean isDispatchThreadForAppContext(Object target) {
575 AppContext appContext = targetToAppContext(target);
576 EventQueue eq = (EventQueue)appContext.get(AppContext.EVENT_QUEUE_KEY);
577
578 AWTAccessor.EventQueueAccessor accessor = AWTAccessor.getEventQueueAccessor();
579 return accessor.isDispatchThreadImpl(eq);
580 }
581
582 @Override
583 public Dimension getScreenSize() {
584 return new Dimension(getScreenWidth(), getScreenHeight());
585 }
586 protected abstract int getScreenWidth();
587 protected abstract int getScreenHeight();
588
589 @Override
590 @SuppressWarnings("deprecation")
591 public FontMetrics getFontMetrics(Font font) {
592 return FontDesignMetrics.getMetrics(font);
593 }
594
595 @Override
596 @SuppressWarnings("deprecation")
597 public String[] getFontList() {
598 String[] hardwiredFontList = {
599 Font.DIALOG, Font.SANS_SERIF, Font.SERIF, Font.MONOSPACED,
600 Font.DIALOG_INPUT
601
602 // -- Obsolete font names from 1.0.2. It was decided that
603 // -- getFontList should not return these old names:
604 // "Helvetica", "TimesRoman", "Courier", "ZapfDingbats"
605 };
606 return hardwiredFontList;
607 }
608
609 /**
610 * Disables erasing of background on the canvas before painting if
611 * this is supported by the current toolkit. It is recommended to
612 * call this method early, before the Canvas becomes displayable,
613 * because some Toolkit implementations do not support changing
614 * this property once the Canvas becomes displayable.
615 */
616 public void disableBackgroundErase(Canvas canvas) {
617 disableBackgroundEraseImpl(canvas);
618 }
619
620 /**
621 * Disables the native erasing of the background on the given
622 * component before painting if this is supported by the current
623 * toolkit. This only has an effect for certain components such as
624 * Canvas, Panel and Window. It is recommended to call this method
625 * early, before the Component becomes displayable, because some
626 * Toolkit implementations do not support changing this property
627 * once the Component becomes displayable.
628 */
629 public void disableBackgroundErase(Component component) {
630 disableBackgroundEraseImpl(component);
631 }
632
633 private void disableBackgroundEraseImpl(Component component) {
634 AWTAccessor.getComponentAccessor().setBackgroundEraseDisabled(component, true);
635 }
636
637 /**
638 * Returns the value of "sun.awt.noerasebackground" property. Default
639 * value is {@code false}.
640 */
641 public static boolean getSunAwtNoerasebackground() {
642 return AccessController.doPrivileged(new GetBooleanAction("sun.awt.noerasebackground"));
643 }
644
645 /**
646 * Returns the value of "sun.awt.erasebackgroundonresize" property. Default
647 * value is {@code false}.
648 */
649 public static boolean getSunAwtErasebackgroundonresize() {
650 return AccessController.doPrivileged(new GetBooleanAction("sun.awt.erasebackgroundonresize"));
651 }
652
653
654 @SuppressWarnings("deprecation")
655 static final SoftCache fileImgCache = new SoftCache();
656
657 @SuppressWarnings("deprecation")
658 static final SoftCache urlImgCache = new SoftCache();
659
660 static Image getImageFromHash(Toolkit tk, URL url) {
661 checkPermissions(url);
662 synchronized (urlImgCache) {
663 String key = url.toString();
664 Image img = (Image)urlImgCache.get(key);
665 if (img == null) {
666 try {
667 img = tk.createImage(new URLImageSource(url));
668 urlImgCache.put(key, img);
669 } catch (Exception e) {
670 }
671 }
672 return img;
673 }
674 }
675
676 static Image getImageFromHash(Toolkit tk,
677 String filename) {
678 checkPermissions(filename);
679 synchronized (fileImgCache) {
680 Image img = (Image)fileImgCache.get(filename);
681 if (img == null) {
682 try {
683 img = tk.createImage(new FileImageSource(filename));
684 fileImgCache.put(filename, img);
685 } catch (Exception e) {
686 }
687 }
688 return img;
689 }
690 }
691
692 @Override
693 public Image getImage(String filename) {
694 return getImageFromHash(this, filename);
695 }
696
697 @Override
698 public Image getImage(URL url) {
699 return getImageFromHash(this, url);
700 }
701
702 protected Image getImageWithResolutionVariant(String fileName,
703 String resolutionVariantName) {
704 synchronized (fileImgCache) {
705 Image image = getImageFromHash(this, fileName);
706 if (image instanceof MultiResolutionImage) {
707 return image;
708 }
709 Image resolutionVariant = getImageFromHash(this, resolutionVariantName);
710 image = createImageWithResolutionVariant(image, resolutionVariant);
711 fileImgCache.put(fileName, image);
712 return image;
713 }
714 }
715
716 protected Image getImageWithResolutionVariant(URL url,
717 URL resolutionVariantURL) {
718 synchronized (urlImgCache) {
719 Image image = getImageFromHash(this, url);
720 if (image instanceof MultiResolutionImage) {
721 return image;
722 }
723 Image resolutionVariant = getImageFromHash(this, resolutionVariantURL);
724 image = createImageWithResolutionVariant(image, resolutionVariant);
725 String key = url.toString();
726 urlImgCache.put(key, image);
727 return image;
728 }
729 }
730
731
732 @Override
733 public Image createImage(String filename) {
734 checkPermissions(filename);
735 return createImage(new FileImageSource(filename));
736 }
737
738 @Override
739 public Image createImage(URL url) {
740 checkPermissions(url);
741 return createImage(new URLImageSource(url));
742 }
743
744 @Override
745 public Image createImage(byte[] data, int offset, int length) {
746 return createImage(new ByteArrayImageSource(data, offset, length));
747 }
748
749 @Override
750 public Image createImage(ImageProducer producer) {
751 return new ToolkitImage(producer);
752 }
753
754 public static Image createImageWithResolutionVariant(Image image,
755 Image resolutionVariant) {
756 return new MultiResolutionToolkitImage(image,
757 Arrays.asList(new ResolutionVariantItem(resolutionVariant, 2, 2)));
758 }
759
760 @Override
761 public int checkImage(Image img, int w, int h, ImageObserver o) {
762 if (!(img instanceof ToolkitImage)) {
763 return ImageObserver.ALLBITS;
764 }
765
766 ToolkitImage tkimg = (ToolkitImage)img;
767 int repbits;
768 if (w == 0 || h == 0) {
769 repbits = ImageObserver.ALLBITS;
770 } else {
771 repbits = tkimg.getImageRep().check(o);
772 }
773 return (tkimg.check(o) | repbits) & checkResolutionVariants(img, w, h, o);
774 }
775
776 @Override
777 public boolean prepareImage(Image img, int w, int h, ImageObserver o) {
778 if (w == 0 || h == 0) {
779 return true;
780 }
781
782 // Must be a ToolkitImage
783 if (!(img instanceof ToolkitImage)) {
784 return true;
785 }
786
787 ToolkitImage tkimg = (ToolkitImage)img;
788 if (tkimg.hasError()) {
789 if (o != null) {
790 o.imageUpdate(img, ImageObserver.ERROR|ImageObserver.ABORT,
791 -1, -1, -1, -1);
792 }
793 return false;
794 }
795 ImageRepresentation ir = tkimg.getImageRep();
796 return ir.prepare(o) & prepareResolutionVariants(img, w, h, o);
797 }
798
799 private int checkResolutionVariants(Image img, int w, int h, ImageObserver o) {
800 if (!(img instanceof MultiResolutionToolkitImage)) {
801 return 0xFFFF;
802 }
803
804 List<ResolutionVariantItem> rvItems
805 = ((MultiResolutionToolkitImage) img).getResolutionVariantItems();
806
807 return rvItems.stream().map(rvItem -> {
808 double scaleX = rvItem.getScaleX();
809 double scaleY = rvItem.getScaleY();
810 return checkImage(
811 rvItem.getImage(),
812 getRVSize(w, scaleX),
813 getRVSize(h, scaleY),
814 MultiResolutionToolkitImage.getResolutionVariantObserver(
815 img, o, scaleX, scaleY, true));
816 }).reduce(0xFFFF , (a, b) -> a & b);
817
818
819 }
820
821 private boolean prepareResolutionVariants(Image img, int w, int h,
822 ImageObserver o) {
823
824 if (!(img instanceof MultiResolutionToolkitImage)) {
825 return true;
826 }
827
828 List<ResolutionVariantItem> rvItems
829 = ((MultiResolutionToolkitImage) img).getResolutionVariantItems();
830
831 return rvItems.stream().map(rvItem -> {
832 double scaleX = rvItem.getScaleX();
833 double scaleY = rvItem.getScaleY();
834 return prepareImage(
835 rvItem.getImage(),
836 getRVSize(w, scaleX),
837 getRVSize(h, scaleY),
838 MultiResolutionToolkitImage.getResolutionVariantObserver(
839 img, o, scaleX, scaleY, true));
840 }).reduce(true, (a, b) -> a && b);
841 }
842
843 private static int getRVSize(int size, double scale) {
844 return (scale == 1 || size == -1) ? size : (int) Math.ceil(scale * size);
845 }
846
847 protected static boolean imageCached(String fileName) {
848 return fileImgCache.containsKey(fileName);
849 }
850
851 protected static boolean imageCached(URL url) {
852 String key = url.toString();
853 return urlImgCache.containsKey(key);
854 }
855
856 public static boolean imageExists(String filename) {
857 if (filename != null) {
858 checkPermissions(filename);
859 return new File(filename).exists();
860 }
861 return false;
862 }
863
864 @SuppressWarnings("try")
865 protected static boolean imageExists(URL url) {
866 if (url != null) {
867 checkPermissions(url);
868 try (InputStream is = url.openStream()) {
869 return true;
870 }catch(IOException e){
871 return false;
872 }
873 }
874 return false;
875 }
876
877 private static void checkPermissions(String filename) {
878 SecurityManager security = System.getSecurityManager();
879 if (security != null) {
880 security.checkRead(filename);
881 }
882 }
883
884 private static void checkPermissions(URL url) {
885 SecurityManager sm = System.getSecurityManager();
886 if (sm != null) {
887 try {
888 java.security.Permission perm =
889 URLUtil.getConnectPermission(url);
890 if (perm != null) {
891 try {
892 sm.checkPermission(perm);
893 } catch (SecurityException se) {
894 // fallback to checkRead/checkConnect for pre 1.2
895 // security managers
896 if ((perm instanceof java.io.FilePermission) &&
897 perm.getActions().indexOf("read") != -1) {
898 sm.checkRead(perm.getName());
899 } else if ((perm instanceof
900 java.net.SocketPermission) &&
901 perm.getActions().indexOf("connect") != -1) {
902 sm.checkConnect(url.getHost(), url.getPort());
903 } else {
904 throw se;
905 }
906 }
907 }
908 } catch (java.io.IOException ioe) {
909 sm.checkConnect(url.getHost(), url.getPort());
910 }
911 }
912 }
913
914 /**
915 * Scans {@code imageList} for best-looking image of specified dimensions.
916 * Image can be scaled and/or padded with transparency.
917 */
918 public static BufferedImage getScaledIconImage(java.util.List<Image> imageList, int width, int height) {
919 if (width == 0 || height == 0) {
920 return null;
921 }
922 Image bestImage = null;
923 int bestWidth = 0;
924 int bestHeight = 0;
925 double bestSimilarity = 3; //Impossibly high value
926 double bestScaleFactor = 0;
927 for (Iterator<Image> i = imageList.iterator();i.hasNext();) {
928 //Iterate imageList looking for best matching image.
929 //'Similarity' measure is defined as good scale factor and small insets.
930 //best possible similarity is 0 (no scale, no insets).
931 //It's found while the experiments that good-looking result is achieved
932 //with scale factors x1, x3/4, x2/3, xN, x1/N.
933 Image im = i.next();
934 if (im == null) {
935 continue;
936 }
937 if (im instanceof ToolkitImage) {
938 ImageRepresentation ir = ((ToolkitImage)im).getImageRep();
939 ir.reconstruct(ImageObserver.ALLBITS);
940 }
941 int iw;
942 int ih;
943 try {
944 iw = im.getWidth(null);
945 ih = im.getHeight(null);
946 } catch (Exception e){
947 continue;
948 }
949 if (iw > 0 && ih > 0) {
950 //Calc scale factor
951 double scaleFactor = Math.min((double)width / (double)iw,
952 (double)height / (double)ih);
953 //Calculate scaled image dimensions
954 //adjusting scale factor to nearest "good" value
955 int adjw = 0;
956 int adjh = 0;
957 double scaleMeasure = 1; //0 - best (no) scale, 1 - impossibly bad
958 if (scaleFactor >= 2) {
959 //Need to enlarge image more than twice
960 //Round down scale factor to multiply by integer value
961 scaleFactor = Math.floor(scaleFactor);
962 adjw = iw * (int)scaleFactor;
963 adjh = ih * (int)scaleFactor;
964 scaleMeasure = 1.0 - 0.5 / scaleFactor;
965 } else if (scaleFactor >= 1) {
966 //Don't scale
967 scaleFactor = 1.0;
968 adjw = iw;
969 adjh = ih;
970 scaleMeasure = 0;
971 } else if (scaleFactor >= 0.75) {
972 //Multiply by 3/4
973 scaleFactor = 0.75;
974 adjw = iw * 3 / 4;
975 adjh = ih * 3 / 4;
976 scaleMeasure = 0.3;
977 } else if (scaleFactor >= 0.6666) {
978 //Multiply by 2/3
979 scaleFactor = 0.6666;
980 adjw = iw * 2 / 3;
981 adjh = ih * 2 / 3;
982 scaleMeasure = 0.33;
983 } else {
984 //Multiply size by 1/scaleDivider
985 //where scaleDivider is minimum possible integer
986 //larger than 1/scaleFactor
987 double scaleDivider = Math.ceil(1.0 / scaleFactor);
988 scaleFactor = 1.0 / scaleDivider;
989 adjw = (int)Math.round((double)iw / scaleDivider);
990 adjh = (int)Math.round((double)ih / scaleDivider);
991 scaleMeasure = 1.0 - 1.0 / scaleDivider;
992 }
993 double similarity = ((double)width - (double)adjw) / (double)width +
994 ((double)height - (double)adjh) / (double)height + //Large padding is bad
995 scaleMeasure; //Large rescale is bad
996 if (similarity < bestSimilarity) {
997 bestSimilarity = similarity;
998 bestScaleFactor = scaleFactor;
999 bestImage = im;
1000 bestWidth = adjw;
1001 bestHeight = adjh;
1002 }
1003 if (similarity == 0) break;
1004 }
1005 }
1006 if (bestImage == null) {
1007 //No images were found, possibly all are broken
1008 return null;
1009 }
1010 BufferedImage bimage =
1011 new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
1012 Graphics2D g = bimage.createGraphics();
1013 g.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
1014 RenderingHints.VALUE_INTERPOLATION_BILINEAR);
1015 try {
1016 int x = (width - bestWidth) / 2;
1017 int y = (height - bestHeight) / 2;
1018 g.drawImage(bestImage, x, y, bestWidth, bestHeight, null);
1019 } finally {
1020 g.dispose();
1021 }
1022 return bimage;
1023 }
1024
1025 public static DataBufferInt getScaledIconData(java.util.List<Image> imageList, int width, int height) {
1026 BufferedImage bimage = getScaledIconImage(imageList, width, height);
1027 if (bimage == null) {
1028 return null;
1029 }
1030 Raster raster = bimage.getRaster();
1031 DataBuffer buffer = raster.getDataBuffer();
1032 return (DataBufferInt)buffer;
1033 }
1034
1035 @Override
1036 protected EventQueue getSystemEventQueueImpl() {
1037 return getSystemEventQueueImplPP();
1038 }
1039
1040 // Package private implementation
1041 static EventQueue getSystemEventQueueImplPP() {
1042 return getSystemEventQueueImplPP(AppContext.getAppContext());
1043 }
1044
1045 public static EventQueue getSystemEventQueueImplPP(AppContext appContext) {
1046 EventQueue theEventQueue =
1047 (EventQueue)appContext.get(AppContext.EVENT_QUEUE_KEY);
1048 return theEventQueue;
1049 }
1050
1051 /**
1052 * Give native peers the ability to query the native container
1053 * given a native component (eg the direct parent may be lightweight).
1054 */
1055 public static Container getNativeContainer(Component c) {
1056 return Toolkit.getNativeContainer(c);
1057 }
1058
1059 /**
1060 * Gives native peers the ability to query the closest HW component.
1061 * If the given component is heavyweight, then it returns this. Otherwise,
1062 * it goes one level up in the hierarchy and tests next component.
1063 */
1064 public static Component getHeavyweightComponent(Component c) {
1065 while (c != null && AWTAccessor.getComponentAccessor().isLightweight(c)) {
1066 c = AWTAccessor.getComponentAccessor().getParent(c);
1067 }
1068 return c;
1069 }
1070
1071 /**
1072 * Returns key modifiers used by Swing to set up a focus accelerator key stroke.
1073 */
1074 public int getFocusAcceleratorKeyMask() {
1075 return InputEvent.ALT_MASK;
1076 }
1077
1078 /**
1079 * Tests whether specified key modifiers mask can be used to enter a printable
1080 * character. This is a default implementation of this method, which reflects
1081 * the way things work on Windows: here, pressing ctrl + alt allows user to enter
1082 * characters from the extended character set (like euro sign or math symbols)
1083 */
1084 public boolean isPrintableCharacterModifiersMask(int mods) {
1085 return ((mods & InputEvent.ALT_MASK) == (mods & InputEvent.CTRL_MASK));
1086 }
1087
1088 /**
1089 * Returns whether popup is allowed to be shown above the task bar.
1090 * This is a default implementation of this method, which checks
1091 * corresponding security permission.
1092 */
1093 public boolean canPopupOverlapTaskBar() {
1094 boolean result = true;
1095 try {
1096 SecurityManager sm = System.getSecurityManager();
1097 if (sm != null) {
1098 sm.checkPermission(AWTPermissions.SET_WINDOW_ALWAYS_ON_TOP_PERMISSION);
1099 }
1100 } catch (SecurityException se) {
1101 // There is no permission to show popups over the task bar
1102 result = false;
1103 }
1104 return result;
1105 }
1106
1107 /**
1108 * Returns a new input method window, with behavior as specified in
1109 * {@link java.awt.im.spi.InputMethodContext#createInputMethodWindow}.
1110 * If the inputContext is not null, the window should return it from its
1111 * getInputContext() method. The window needs to implement
1112 * sun.awt.im.InputMethodWindow.
1113 * <p>
1114 * SunToolkit subclasses can override this method to return better input
1115 * method windows.
1116 */
1117 @Override
1118 public Window createInputMethodWindow(String title, InputContext context) {
1119 return new sun.awt.im.SimpleInputMethodWindow(title, context);
1120 }
1121
1122 /**
1123 * Returns whether enableInputMethods should be set to true for peered
1124 * TextComponent instances on this platform. False by default.
1125 */
1126 @Override
1127 public boolean enableInputMethodsForTextComponent() {
1128 return false;
1129 }
1130
1131 private static Locale startupLocale = null;
1132
1133 /**
1134 * Returns the locale in which the runtime was started.
1135 */
1136 public static Locale getStartupLocale() {
1137 if (startupLocale == null) {
1138 String language, region, country, variant;
1139 language = AccessController.doPrivileged(
1140 new GetPropertyAction("user.language", "en"));
1141 // for compatibility, check for old user.region property
1142 region = AccessController.doPrivileged(
1143 new GetPropertyAction("user.region"));
1144 if (region != null) {
1145 // region can be of form country, country_variant, or _variant
1146 int i = region.indexOf('_');
1147 if (i >= 0) {
1148 country = region.substring(0, i);
1149 variant = region.substring(i + 1);
1150 } else {
1151 country = region;
1152 variant = "";
1153 }
1154 } else {
1155 country = AccessController.doPrivileged(
1156 new GetPropertyAction("user.country", ""));
1157 variant = AccessController.doPrivileged(
1158 new GetPropertyAction("user.variant", ""));
1159 }
1160 startupLocale = new Locale(language, country, variant);
1161 }
1162 return startupLocale;
1163 }
1164
1165 /**
1166 * Returns the default keyboard locale of the underlying operating system
1167 */
1168 @Override
1169 public Locale getDefaultKeyboardLocale() {
1170 return getStartupLocale();
1171 }
1172
1173 /**
1174 * Returns whether default toolkit needs the support of the xembed
1175 * from embedding host(if any).
1176 * @return {@code true}, if XEmbed is needed, {@code false} 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}, if XEmbed is needed, {@code false} 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} has no
1219 * effect, and {@code isModalExcluded} 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}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 * <pre>{@code
1442 * Frame f = ...;
1443 * f.setVisible(true);
1444 * ((SunToolkit)Toolkit.getDefaultToolkit()).realSync();
1445 * }</pre>
1446 *
1447 * <p> After realSync, {@code f} 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 * <pre>{@code
1453 * b.requestFocus();
1454 * ((SunToolkit)Toolkit.getDefaultToolkit()).realSync();
1455 * }</pre>
1456 *
1457 * <p> After realSync, {@code b} 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} if some events were processed,
1533 * {@code false} 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} if more processing is
1551 * necessary, {@code false} 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} ancestor of the component {@code comp}.
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