1 /*
2 * Copyright (c) 1997, 2012, 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 static java.awt.RenderingHints.*;
30 import java.awt.dnd.*;
31 import java.awt.dnd.peer.DragSourceContextPeer;
32 import java.awt.peer.*;
33 import java.awt.event.WindowEvent;
34 import java.awt.event.KeyEvent;
35 import java.awt.image.*;
36 import java.awt.TrayIcon;
37 import java.awt.SystemTray;
38 import java.awt.event.InputEvent;
39 import java.net.URL;
40 import java.util.*;
41 import java.util.concurrent.TimeUnit;
42 import java.util.concurrent.locks.Condition;
43 import java.util.concurrent.locks.Lock;
44 import java.util.concurrent.locks.ReentrantLock;
45
46 import sun.security.util.SecurityConstants;
47 import sun.util.logging.PlatformLogger;
48 import sun.misc.SoftCache;
49 import sun.font.FontDesignMetrics;
50 import sun.awt.im.InputContext;
51 import sun.awt.image.*;
52 import sun.security.action.GetPropertyAction;
53 import sun.security.action.GetBooleanAction;
54 import java.lang.reflect.InvocationTargetException;
55 import java.security.AccessController;
56
57 public abstract class SunToolkit extends Toolkit
58 implements WindowClosingSupport, WindowClosingListener,
59 ComponentFactory, InputMethodSupport, KeyboardFocusManagerPeerProvider {
60
61 private static final PlatformLogger log = PlatformLogger.getLogger("sun.awt.SunToolkit");
62
63 /* Load debug settings for native code */
64 static {
65 if (AccessController.doPrivileged(new GetBooleanAction("sun.awt.nativedebug"))) {
66 DebugSettings.init();
67 }
68 };
69
70 /**
71 * Special mask for the UngrabEvent events, in addition to the
72 * public masks defined in AWTEvent. Should be used as the mask
73 * value for Toolkit.addAWTEventListener.
74 */
75 public static final int GRAB_EVENT_MASK = 0x80000000;
76
77 /* The key to put()/get() the PostEventQueue into/from the AppContext.
78 */
79 private static final String POST_EVENT_QUEUE_KEY = "PostEventQueue";
80
81 /**
82 * Number of buttons.
83 * By default it's taken from the system. If system value does not
84 * fit into int type range, use our own MAX_BUTTONS_SUPPORT value.
85 */
86 protected static int numberOfButtons = 0;
87
88
89 /* XFree standard mention 24 buttons as maximum:
90 * http://www.xfree86.org/current/mouse.4.html
91 * We workaround systems supporting more than 24 buttons.
92 * Otherwise, we have to use long type values as masks
93 * which leads to API change.
94 * InputEvent.BUTTON_DOWN_MASK may contain only 21 masks due to
95 * the 4-bytes limit for the int type. (CR 6799099)
96 * One more bit is reserved for FIRST_HIGH_BIT.
97 */
98 public final static int MAX_BUTTONS_SUPPORTED = 20;
99
100 private static void initEQ(AppContext appContext) {
101 EventQueue eventQueue;
102
103 String eqName = System.getProperty("AWT.EventQueueClass",
104 "java.awt.EventQueue");
105
106 try {
107 eventQueue = (EventQueue)Class.forName(eqName).newInstance();
108 } catch (Exception e) {
109 e.printStackTrace();
110 System.err.println("Failed loading " + eqName + ": " + e);
111 eventQueue = new EventQueue();
112 }
113 appContext.put(AppContext.EVENT_QUEUE_KEY, eventQueue);
114
115 PostEventQueue postEventQueue = new PostEventQueue(eventQueue);
116 appContext.put(POST_EVENT_QUEUE_KEY, postEventQueue);
117 }
118
119 public SunToolkit() {
120 // 7122796: Always create an EQ for the main AppContext
121 initEQ(AppContext.getMainAppContext());
122 }
123
124 public boolean useBufferPerWindow() {
125 return false;
126 }
127
128 public abstract WindowPeer createWindow(Window target)
129 throws HeadlessException;
130
131 public abstract FramePeer createFrame(Frame target)
132 throws HeadlessException;
133
134 public abstract DialogPeer createDialog(Dialog target)
135 throws HeadlessException;
136
137 public abstract ButtonPeer createButton(Button target)
138 throws HeadlessException;
139
140 public abstract TextFieldPeer createTextField(TextField target)
141 throws HeadlessException;
142
143 public abstract ChoicePeer createChoice(Choice target)
144 throws HeadlessException;
145
146 public abstract LabelPeer createLabel(Label target)
147 throws HeadlessException;
148
149 public abstract ListPeer createList(java.awt.List target)
150 throws HeadlessException;
151
152 public abstract CheckboxPeer createCheckbox(Checkbox target)
153 throws HeadlessException;
154
155 public abstract ScrollbarPeer createScrollbar(Scrollbar target)
156 throws HeadlessException;
157
158 public abstract ScrollPanePeer createScrollPane(ScrollPane target)
159 throws HeadlessException;
160
161 public abstract TextAreaPeer createTextArea(TextArea target)
162 throws HeadlessException;
163
164 public abstract FileDialogPeer createFileDialog(FileDialog target)
165 throws HeadlessException;
166
167 public abstract MenuBarPeer createMenuBar(MenuBar target)
168 throws HeadlessException;
169
170 public abstract MenuPeer createMenu(Menu target)
171 throws HeadlessException;
172
173 public abstract PopupMenuPeer createPopupMenu(PopupMenu target)
174 throws HeadlessException;
175
176 public abstract MenuItemPeer createMenuItem(MenuItem target)
177 throws HeadlessException;
178
179 public abstract CheckboxMenuItemPeer createCheckboxMenuItem(
180 CheckboxMenuItem target)
181 throws HeadlessException;
182
183 public abstract DragSourceContextPeer createDragSourceContextPeer(
184 DragGestureEvent dge)
185 throws InvalidDnDOperationException;
186
187 public abstract TrayIconPeer createTrayIcon(TrayIcon target)
188 throws HeadlessException, AWTException;
189
190 public abstract SystemTrayPeer createSystemTray(SystemTray target);
191
192 public abstract boolean isTraySupported();
193
194 @SuppressWarnings("deprecation")
195 public abstract FontPeer getFontPeer(String name, int style);
196
197 public abstract RobotPeer createRobot(Robot target, GraphicsDevice screen)
198 throws AWTException;
199
200 public abstract KeyboardFocusManagerPeer getKeyboardFocusManagerPeer()
201 throws HeadlessException;
202
203 /**
204 * The AWT lock is typically only used on Unix platforms to synchronize
205 * access to Xlib, OpenGL, etc. However, these methods are implemented
206 * in SunToolkit so that they can be called from shared code (e.g.
207 * from the OGL pipeline) or from the X11 pipeline regardless of whether
208 * XToolkit or MToolkit is currently in use. There are native macros
209 * (such as AWT_LOCK) defined in awt.h, so if the implementation of these
210 * methods is changed, make sure it is compatible with the native macros.
211 *
212 * Note: The following methods (awtLock(), awtUnlock(), etc) should be
213 * used in place of:
214 * synchronized (getAWTLock()) {
215 * ...
216 * }
217 *
218 * By factoring these methods out specially, we are able to change the
219 * implementation of these methods (e.g. use more advanced locking
220 * mechanisms) without impacting calling code.
221 *
222 * Sample usage:
223 * private void doStuffWithXlib() {
224 * assert !SunToolkit.isAWTLockHeldByCurrentThread();
225 * SunToolkit.awtLock();
226 * try {
227 * ...
228 * XlibWrapper.XDoStuff();
229 * } finally {
230 * SunToolkit.awtUnlock();
231 * }
232 * }
233 */
234
235 private static final ReentrantLock AWT_LOCK = new ReentrantLock();
236 private static final Condition AWT_LOCK_COND = AWT_LOCK.newCondition();
237
238 public static final void awtLock() {
239 AWT_LOCK.lock();
240 }
241
242 public static final boolean awtTryLock() {
243 return AWT_LOCK.tryLock();
244 }
245
246 public static final void awtUnlock() {
247 AWT_LOCK.unlock();
248 }
249
250 public static final void awtLockWait()
251 throws InterruptedException
252 {
253 AWT_LOCK_COND.await();
254 }
255
256 public static final void awtLockWait(long timeout)
257 throws InterruptedException
258 {
259 AWT_LOCK_COND.await(timeout, TimeUnit.MILLISECONDS);
260 }
261
262 public static final void awtLockNotify() {
263 AWT_LOCK_COND.signal();
264 }
265
266 public static final void awtLockNotifyAll() {
267 AWT_LOCK_COND.signalAll();
268 }
269
270 public static final boolean isAWTLockHeldByCurrentThread() {
271 return AWT_LOCK.isHeldByCurrentThread();
272 }
273
274 /*
275 * Create a new AppContext, along with its EventQueue, for a
276 * new ThreadGroup. Browser code, for example, would use this
277 * method to create an AppContext & EventQueue for an Applet.
278 */
279 public static AppContext createNewAppContext() {
280 ThreadGroup threadGroup = Thread.currentThread().getThreadGroup();
281 // Create appContext before initialization of EventQueue, so all
282 // the calls to AppContext.getAppContext() from EventQueue ctor
283 // return correct values
284 AppContext appContext = new AppContext(threadGroup);
285
286 initEQ(appContext);
287
288 return appContext;
289 }
290
291 static void wakeupEventQueue(EventQueue q, boolean isShutdown){
292 AWTAccessor.getEventQueueAccessor().wakeup(q, isShutdown);
293 }
294
295 /*
296 * Fetch the peer associated with the given target (as specified
297 * in the peer creation method). This can be used to determine
298 * things like what the parent peer is. If the target is null
299 * or the target can't be found (either because the a peer was
300 * never created for it or the peer was disposed), a null will
301 * be returned.
302 */
303 protected static Object targetToPeer(Object target) {
304 if (target != null && !GraphicsEnvironment.isHeadless()) {
305 return AWTAutoShutdown.getInstance().getPeer(target);
306 }
307 return null;
308 }
309
310 protected static void targetCreatedPeer(Object target, Object peer) {
311 if (target != null && peer != null &&
312 !GraphicsEnvironment.isHeadless())
313 {
314 AWTAutoShutdown.getInstance().registerPeer(target, peer);
315 }
316 }
317
318 protected static void targetDisposedPeer(Object target, Object peer) {
319 if (target != null && peer != null &&
320 !GraphicsEnvironment.isHeadless())
321 {
322 AWTAutoShutdown.getInstance().unregisterPeer(target, peer);
323 }
324 }
325
326 // Maps from non-Component/MenuComponent to AppContext.
327 // WeakHashMap<Component,AppContext>
328 private static final Map<Object, AppContext> appContextMap =
329 Collections.synchronizedMap(new WeakHashMap<Object, AppContext>());
330
331 /**
332 * Sets the appContext field of target. If target is not a Component or
333 * MenuComponent, this returns false.
334 */
335 private static boolean setAppContext(Object target,
336 AppContext context) {
337 if (target instanceof Component) {
338 AWTAccessor.getComponentAccessor().
339 setAppContext((Component)target, context);
340 } else if (target instanceof MenuComponent) {
341 AWTAccessor.getMenuComponentAccessor().
342 setAppContext((MenuComponent)target, context);
343 } else {
344 return false;
345 }
346 return true;
347 }
348
349 /**
350 * Returns the appContext field for target. If target is not a
351 * Component or MenuComponent this returns null.
352 */
353 private static AppContext getAppContext(Object target) {
354 if (target instanceof Component) {
355 return AWTAccessor.getComponentAccessor().
356 getAppContext((Component)target);
357 } else if (target instanceof MenuComponent) {
358 return AWTAccessor.getMenuComponentAccessor().
359 getAppContext((MenuComponent)target);
360 } else {
361 return null;
362 }
363 }
364
365 /*
366 * Fetch the AppContext associated with the given target.
367 * This can be used to determine things like which EventQueue
368 * to use for posting events to a Component. If the target is
369 * null or the target can't be found, a null with be returned.
370 */
371 public static AppContext targetToAppContext(Object target) {
372 if (target == null || GraphicsEnvironment.isHeadless()) {
373 return null;
374 }
375 AppContext context = getAppContext(target);
376 if (context == null) {
377 // target is not a Component/MenuComponent, try the
378 // appContextMap.
379 context = appContextMap.get(target);
380 }
381 return context;
382 }
383
384 /**
385 * Sets the synchronous status of focus requests on lightweight
386 * components in the specified window to the specified value.
387 * If the boolean parameter is <code>true</code> then the focus
388 * requests on lightweight components will be performed
389 * synchronously, if it is <code>false</code>, then asynchronously.
390 * By default, all windows have their lightweight request status
391 * set to asynchronous.
392 * <p>
393 * The application can only set the status of lightweight focus
394 * requests to synchronous for any of its windows if it doesn't
395 * perform focus transfers between different heavyweight containers.
396 * In this case the observable focus behaviour is the same as with
397 * asynchronous status.
398 * <p>
399 * If the application performs focus transfer between different
400 * heavyweight containers and sets the lightweight focus request
401 * status to synchronous for any of its windows, then further focus
402 * behaviour is unspecified.
403 * <p>
404 * @param w window for which the lightweight focus request status
405 * should be set
406 * @param status the value of lightweight focus request status
407 */
408
409 public static void setLWRequestStatus(Window changed,boolean status){
410 AWTAccessor.getWindowAccessor().setLWRequestStatus(changed, status);
411 };
412
413 public static void checkAndSetPolicy(Container cont) {
414 FocusTraversalPolicy defaultPolicy = KeyboardFocusManager.
415 getCurrentKeyboardFocusManager().
416 getDefaultFocusTraversalPolicy();
417
418 cont.setFocusTraversalPolicy(defaultPolicy);
419 }
420
421 private static FocusTraversalPolicy createLayoutPolicy() {
422 FocusTraversalPolicy policy = null;
423 try {
424 Class<?> layoutPolicyClass =
425 Class.forName("javax.swing.LayoutFocusTraversalPolicy");
426 policy = (FocusTraversalPolicy)layoutPolicyClass.newInstance();
427 }
428 catch (ClassNotFoundException e) {
429 assert false;
430 }
431 catch (InstantiationException e) {
432 assert false;
433 }
434 catch (IllegalAccessException e) {
435 assert false;
436 }
437
438 return policy;
439 }
440
441 /*
442 * Insert a mapping from target to AppContext, for later retrieval
443 * via targetToAppContext() above.
444 */
445 public static void insertTargetMapping(Object target, AppContext appContext) {
446 if (!GraphicsEnvironment.isHeadless()) {
447 if (!setAppContext(target, appContext)) {
448 // Target is not a Component/MenuComponent, use the private Map
449 // instead.
450 appContextMap.put(target, appContext);
451 }
452 }
453 }
454
455 /*
456 * Post an AWTEvent to the Java EventQueue, using the PostEventQueue
457 * to avoid possibly calling client code (EventQueueSubclass.postEvent())
458 * on the toolkit (AWT-Windows/AWT-Motif) thread. This function should
459 * not be called under another lock since it locks the EventQueue.
460 * See bugids 4632918, 4526597.
461 */
462 public static void postEvent(AppContext appContext, AWTEvent event) {
463 if (event == null) {
464 throw new NullPointerException();
465 }
466
467 AWTAccessor.SequencedEventAccessor sea = AWTAccessor.getSequencedEventAccessor();
468 if (sea != null && sea.isSequencedEvent(event)) {
469 AWTEvent nested = sea.getNested(event);
470 if (nested.getID() == WindowEvent.WINDOW_LOST_FOCUS &&
471 nested instanceof TimedWindowEvent)
472 {
473 TimedWindowEvent twe = (TimedWindowEvent)nested;
474 ((SunToolkit)Toolkit.getDefaultToolkit()).
475 setWindowDeactivationTime((Window)twe.getSource(), twe.getWhen());
476 }
477 }
478
479 // All events posted via this method are system-generated.
480 // Placing the following call here reduces considerably the
481 // number of places throughout the toolkit that would
482 // otherwise have to be modified to precisely identify
483 // system-generated events.
484 setSystemGenerated(event);
485 AppContext eventContext = targetToAppContext(event.getSource());
486 if (eventContext != null && !eventContext.equals(appContext)) {
487 log.fine("Event posted on wrong app context : " + event);
488 }
489 PostEventQueue postEventQueue =
490 (PostEventQueue)appContext.get(POST_EVENT_QUEUE_KEY);
491 if (postEventQueue != null) {
492 postEventQueue.postEvent(event);
493 }
494 }
495
496 /*
497 * Post AWTEvent of high priority.
498 */
499 public static void postPriorityEvent(final AWTEvent e) {
500 PeerEvent pe = new PeerEvent(Toolkit.getDefaultToolkit(), new Runnable() {
501 public void run() {
502 AWTAccessor.getAWTEventAccessor().setPosted(e);
503 ((Component)e.getSource()).dispatchEvent(e);
504 }
505 }, PeerEvent.ULTIMATE_PRIORITY_EVENT);
506 postEvent(targetToAppContext(e.getSource()), pe);
507 }
508
509 /*
510 * Flush any pending events which haven't been posted to the AWT
511 * EventQueue yet.
512 */
513 public static void flushPendingEvents() {
514 AppContext appContext = AppContext.getAppContext();
515 flushPendingEvents(appContext);
516 }
517
518 /*
519 * Flush the PostEventQueue for the right AppContext.
520 * The default flushPendingEvents only flushes the thread-local context,
521 * which is not always correct, c.f. 3746956
522 */
523 public static void flushPendingEvents(AppContext appContext) {
524 PostEventQueue postEventQueue =
525 (PostEventQueue)appContext.get(POST_EVENT_QUEUE_KEY);
526 if (postEventQueue != null) {
527 postEventQueue.flush();
528 }
529 }
530
531 /*
532 * Execute a chunk of code on the Java event handler thread for the
533 * given target. Does not wait for the execution to occur before
534 * returning to the caller.
535 */
536 public static void executeOnEventHandlerThread(Object target,
537 Runnable runnable) {
538 executeOnEventHandlerThread(new PeerEvent(target, runnable, PeerEvent.PRIORITY_EVENT));
539 }
540
541 /*
542 * Fixed 5064013: the InvocationEvent time should be equals
543 * the time of the ActionEvent
544 */
545 @SuppressWarnings("serial")
546 public static void executeOnEventHandlerThread(Object target,
547 Runnable runnable,
548 final long when) {
549 executeOnEventHandlerThread(
550 new PeerEvent(target, runnable, PeerEvent.PRIORITY_EVENT) {
551 public long getWhen() {
552 return when;
553 }
554 });
555 }
556
557 /*
558 * Execute a chunk of code on the Java event handler thread for the
559 * given target. Does not wait for the execution to occur before
560 * returning to the caller.
561 */
562 public static void executeOnEventHandlerThread(PeerEvent peerEvent) {
563 postEvent(targetToAppContext(peerEvent.getSource()), peerEvent);
564 }
565
566 /*
567 * Execute a chunk of code on the Java event handler thread. The
568 * method takes into account provided AppContext and sets
569 * <code>SunToolkit.getDefaultToolkit()</code> as a target of the
570 * event. See 6451487 for detailes.
571 * Does not wait for the execution to occur before returning to
572 * the caller.
573 */
574 public static void invokeLaterOnAppContext(
575 AppContext appContext, Runnable dispatcher)
576 {
577 postEvent(appContext,
578 new PeerEvent(Toolkit.getDefaultToolkit(), dispatcher,
579 PeerEvent.PRIORITY_EVENT));
580 }
581
582 /*
583 * Execute a chunk of code on the Java event handler thread for the
584 * given target. Waits for the execution to occur before returning
585 * to the caller.
586 */
587 public static void executeOnEDTAndWait(Object target, Runnable runnable)
588 throws InterruptedException, InvocationTargetException
589 {
590 if (EventQueue.isDispatchThread()) {
591 throw new Error("Cannot call executeOnEDTAndWait from any event dispatcher thread");
592 }
593
594 class AWTInvocationLock {}
595 Object lock = new AWTInvocationLock();
596
597 PeerEvent event = new PeerEvent(target, runnable, lock, true, PeerEvent.PRIORITY_EVENT);
598
599 synchronized (lock) {
600 executeOnEventHandlerThread(event);
601 while(!event.isDispatched()) {
602 lock.wait();
603 }
604 }
605
606 Throwable eventThrowable = event.getThrowable();
607 if (eventThrowable != null) {
608 throw new InvocationTargetException(eventThrowable);
609 }
610 }
611
612 /*
613 * Returns true if the calling thread is the event dispatch thread
614 * contained within AppContext which associated with the given target.
615 * Use this call to ensure that a given task is being executed
616 * (or not being) on the event dispatch thread for the given target.
617 */
618 public static boolean isDispatchThreadForAppContext(Object target) {
619 AppContext appContext = targetToAppContext(target);
620 EventQueue eq = (EventQueue)appContext.get(AppContext.EVENT_QUEUE_KEY);
621
622 AWTAccessor.EventQueueAccessor accessor = AWTAccessor.getEventQueueAccessor();
623 return accessor.isDispatchThreadImpl(eq);
624 }
625
626 public Dimension getScreenSize() {
627 return new Dimension(getScreenWidth(), getScreenHeight());
628 }
629 protected abstract int getScreenWidth();
630 protected abstract int getScreenHeight();
631
632 @SuppressWarnings("deprecation")
633 public FontMetrics getFontMetrics(Font font) {
634 return FontDesignMetrics.getMetrics(font);
635 }
636
637 @SuppressWarnings("deprecation")
638 public String[] getFontList() {
639 String[] hardwiredFontList = {
640 Font.DIALOG, Font.SANS_SERIF, Font.SERIF, Font.MONOSPACED,
641 Font.DIALOG_INPUT
642
643 // -- Obsolete font names from 1.0.2. It was decided that
644 // -- getFontList should not return these old names:
645 // "Helvetica", "TimesRoman", "Courier", "ZapfDingbats"
646 };
647 return hardwiredFontList;
648 }
649
650 public PanelPeer createPanel(Panel target) {
651 return (PanelPeer)createComponent(target);
652 }
653
654 public CanvasPeer createCanvas(Canvas target) {
655 return (CanvasPeer)createComponent(target);
656 }
657
658 /**
659 * Disables erasing of background on the canvas before painting if
660 * this is supported by the current toolkit. It is recommended to
661 * call this method early, before the Canvas becomes displayable,
662 * because some Toolkit implementations do not support changing
663 * this property once the Canvas becomes displayable.
664 */
665 public void disableBackgroundErase(Canvas canvas) {
666 disableBackgroundEraseImpl(canvas);
667 }
668
669 /**
670 * Disables the native erasing of the background on the given
671 * component before painting if this is supported by the current
672 * toolkit. This only has an effect for certain components such as
673 * Canvas, Panel and Window. It is recommended to call this method
674 * early, before the Component becomes displayable, because some
675 * Toolkit implementations do not support changing this property
676 * once the Component becomes displayable.
677 */
678 public void disableBackgroundErase(Component component) {
679 disableBackgroundEraseImpl(component);
680 }
681
682 private void disableBackgroundEraseImpl(Component component) {
683 AWTAccessor.getComponentAccessor().setBackgroundEraseDisabled(component, true);
684 }
685
686 /**
687 * Returns the value of "sun.awt.noerasebackground" property. Default
688 * value is {@code false}.
689 */
690 public static boolean getSunAwtNoerasebackground() {
691 return AccessController.doPrivileged(new GetBooleanAction("sun.awt.noerasebackground"));
692 }
693
694 /**
695 * Returns the value of "sun.awt.erasebackgroundonresize" property. Default
696 * value is {@code false}.
697 */
698 public static boolean getSunAwtErasebackgroundonresize() {
699 return AccessController.doPrivileged(new GetBooleanAction("sun.awt.erasebackgroundonresize"));
700 }
701
702
703 static final SoftCache imgCache = new SoftCache();
704
705 static Image getImageFromHash(Toolkit tk, URL url) {
706 SecurityManager sm = System.getSecurityManager();
707 if (sm != null) {
708 try {
709 java.security.Permission perm =
710 url.openConnection().getPermission();
711 if (perm != null) {
712 try {
713 sm.checkPermission(perm);
714 } catch (SecurityException se) {
715 // fallback to checkRead/checkConnect for pre 1.2
716 // security managers
717 if ((perm instanceof java.io.FilePermission) &&
718 perm.getActions().indexOf("read") != -1) {
719 sm.checkRead(perm.getName());
720 } else if ((perm instanceof
721 java.net.SocketPermission) &&
722 perm.getActions().indexOf("connect") != -1) {
723 sm.checkConnect(url.getHost(), url.getPort());
724 } else {
725 throw se;
726 }
727 }
728 }
729 } catch (java.io.IOException ioe) {
730 sm.checkConnect(url.getHost(), url.getPort());
731 }
732 }
733 synchronized (imgCache) {
734 Image img = (Image)imgCache.get(url);
735 if (img == null) {
736 try {
737 img = tk.createImage(new URLImageSource(url));
738 imgCache.put(url, img);
739 } catch (Exception e) {
740 }
741 }
742 return img;
743 }
744 }
745
746 static Image getImageFromHash(Toolkit tk,
747 String filename) {
748 SecurityManager security = System.getSecurityManager();
749 if (security != null) {
750 security.checkRead(filename);
751 }
752 synchronized (imgCache) {
753 Image img = (Image)imgCache.get(filename);
754 if (img == null) {
755 try {
756 img = tk.createImage(new FileImageSource(filename));
757 imgCache.put(filename, img);
758 } catch (Exception e) {
759 }
760 }
761 return img;
762 }
763 }
764
765 public Image getImage(String filename) {
766 return getImageFromHash(this, filename);
767 }
768
769 public Image getImage(URL url) {
770 return getImageFromHash(this, url);
771 }
772
773 public Image createImage(String filename) {
774 SecurityManager security = System.getSecurityManager();
775 if (security != null) {
776 security.checkRead(filename);
777 }
778 return createImage(new FileImageSource(filename));
779 }
780
781 public Image createImage(URL url) {
782 SecurityManager sm = System.getSecurityManager();
783 if (sm != null) {
784 try {
785 java.security.Permission perm =
786 url.openConnection().getPermission();
787 if (perm != null) {
788 try {
789 sm.checkPermission(perm);
790 } catch (SecurityException se) {
791 // fallback to checkRead/checkConnect for pre 1.2
792 // security managers
793 if ((perm instanceof java.io.FilePermission) &&
794 perm.getActions().indexOf("read") != -1) {
795 sm.checkRead(perm.getName());
796 } else if ((perm instanceof
797 java.net.SocketPermission) &&
798 perm.getActions().indexOf("connect") != -1) {
799 sm.checkConnect(url.getHost(), url.getPort());
800 } else {
801 throw se;
802 }
803 }
804 }
805 } catch (java.io.IOException ioe) {
806 sm.checkConnect(url.getHost(), url.getPort());
807 }
808 }
809 return createImage(new URLImageSource(url));
810 }
811
812 public Image createImage(byte[] data, int offset, int length) {
813 return createImage(new ByteArrayImageSource(data, offset, length));
814 }
815
816 public Image createImage(ImageProducer producer) {
817 return new ToolkitImage(producer);
818 }
819
820 public int checkImage(Image img, int w, int h, ImageObserver o) {
821 if (!(img instanceof ToolkitImage)) {
822 return ImageObserver.ALLBITS;
823 }
824
825 ToolkitImage tkimg = (ToolkitImage)img;
826 int repbits;
827 if (w == 0 || h == 0) {
828 repbits = ImageObserver.ALLBITS;
829 } else {
830 repbits = tkimg.getImageRep().check(o);
831 }
832 return tkimg.check(o) | repbits;
833 }
834
835 public boolean prepareImage(Image img, int w, int h, ImageObserver o) {
836 if (w == 0 || h == 0) {
837 return true;
838 }
839
840 // Must be a ToolkitImage
841 if (!(img instanceof ToolkitImage)) {
842 return true;
843 }
844
845 ToolkitImage tkimg = (ToolkitImage)img;
846 if (tkimg.hasError()) {
847 if (o != null) {
848 o.imageUpdate(img, ImageObserver.ERROR|ImageObserver.ABORT,
849 -1, -1, -1, -1);
850 }
851 return false;
852 }
853 ImageRepresentation ir = tkimg.getImageRep();
854 return ir.prepare(o);
855 }
856
857 /**
858 * Scans {@code imageList} for best-looking image of specified dimensions.
859 * Image can be scaled and/or padded with transparency.
860 */
861 public static BufferedImage getScaledIconImage(java.util.List<Image> imageList, int width, int height) {
862 if (width == 0 || height == 0) {
863 return null;
864 }
865 Image bestImage = null;
866 int bestWidth = 0;
867 int bestHeight = 0;
868 double bestSimilarity = 3; //Impossibly high value
869 double bestScaleFactor = 0;
870 for (Iterator<Image> i = imageList.iterator();i.hasNext();) {
871 //Iterate imageList looking for best matching image.
872 //'Similarity' measure is defined as good scale factor and small insets.
873 //best possible similarity is 0 (no scale, no insets).
874 //It's found while the experiments that good-looking result is achieved
875 //with scale factors x1, x3/4, x2/3, xN, x1/N.
876 Image im = i.next();
877 if (im == null) {
878 if (log.isLoggable(PlatformLogger.FINER)) {
879 log.finer("SunToolkit.getScaledIconImage: " +
880 "Skipping the image passed into Java because it's null.");
881 }
882 continue;
883 }
884 if (im instanceof ToolkitImage) {
885 ImageRepresentation ir = ((ToolkitImage)im).getImageRep();
886 ir.reconstruct(ImageObserver.ALLBITS);
887 }
888 int iw;
889 int ih;
890 try {
891 iw = im.getWidth(null);
892 ih = im.getHeight(null);
893 } catch (Exception e){
894 if (log.isLoggable(PlatformLogger.FINER)) {
895 log.finer("SunToolkit.getScaledIconImage: " +
896 "Perhaps the image passed into Java is broken. Skipping this icon.");
897 }
898 continue;
899 }
900 if (iw > 0 && ih > 0) {
901 //Calc scale factor
902 double scaleFactor = Math.min((double)width / (double)iw,
903 (double)height / (double)ih);
904 //Calculate scaled image dimensions
905 //adjusting scale factor to nearest "good" value
906 int adjw = 0;
907 int adjh = 0;
908 double scaleMeasure = 1; //0 - best (no) scale, 1 - impossibly bad
909 if (scaleFactor >= 2) {
910 //Need to enlarge image more than twice
911 //Round down scale factor to multiply by integer value
912 scaleFactor = Math.floor(scaleFactor);
913 adjw = iw * (int)scaleFactor;
914 adjh = ih * (int)scaleFactor;
915 scaleMeasure = 1.0 - 0.5 / scaleFactor;
916 } else if (scaleFactor >= 1) {
917 //Don't scale
918 scaleFactor = 1.0;
919 adjw = iw;
920 adjh = ih;
921 scaleMeasure = 0;
922 } else if (scaleFactor >= 0.75) {
923 //Multiply by 3/4
924 scaleFactor = 0.75;
925 adjw = iw * 3 / 4;
926 adjh = ih * 3 / 4;
927 scaleMeasure = 0.3;
928 } else if (scaleFactor >= 0.6666) {
929 //Multiply by 2/3
930 scaleFactor = 0.6666;
931 adjw = iw * 2 / 3;
932 adjh = ih * 2 / 3;
933 scaleMeasure = 0.33;
934 } else {
935 //Multiply size by 1/scaleDivider
936 //where scaleDivider is minimum possible integer
937 //larger than 1/scaleFactor
938 double scaleDivider = Math.ceil(1.0 / scaleFactor);
939 scaleFactor = 1.0 / scaleDivider;
940 adjw = (int)Math.round((double)iw / scaleDivider);
941 adjh = (int)Math.round((double)ih / scaleDivider);
942 scaleMeasure = 1.0 - 1.0 / scaleDivider;
943 }
944 double similarity = ((double)width - (double)adjw) / (double)width +
945 ((double)height - (double)adjh) / (double)height + //Large padding is bad
946 scaleMeasure; //Large rescale is bad
947 if (similarity < bestSimilarity) {
948 bestSimilarity = similarity;
949 bestScaleFactor = scaleFactor;
950 bestImage = im;
951 bestWidth = adjw;
952 bestHeight = adjh;
953 }
954 if (similarity == 0) break;
955 }
956 }
957 if (bestImage == null) {
958 //No images were found, possibly all are broken
959 return null;
960 }
961 BufferedImage bimage =
962 new BufferedImage(width, height, BufferedImage.TYPE_INT_ARGB);
963 Graphics2D g = bimage.createGraphics();
964 g.setRenderingHint(RenderingHints.KEY_INTERPOLATION,
965 RenderingHints.VALUE_INTERPOLATION_BILINEAR);
966 try {
967 int x = (width - bestWidth) / 2;
968 int y = (height - bestHeight) / 2;
969 if (log.isLoggable(PlatformLogger.FINER)) {
970 log.finer("WWindowPeer.getScaledIconData() result : " +
971 "w : " + width + " h : " + height +
972 " iW : " + bestImage.getWidth(null) + " iH : " + bestImage.getHeight(null) +
973 " sim : " + bestSimilarity + " sf : " + bestScaleFactor +
974 " adjW : " + bestWidth + " adjH : " + bestHeight +
975 " x : " + x + " y : " + y);
976 }
977 g.drawImage(bestImage, x, y, bestWidth, bestHeight, null);
978 } finally {
979 g.dispose();
980 }
981 return bimage;
982 }
983
984 public static DataBufferInt getScaledIconData(java.util.List<Image> imageList, int width, int height) {
985 BufferedImage bimage = getScaledIconImage(imageList, width, height);
986 if (bimage == null) {
987 if (log.isLoggable(PlatformLogger.FINER)) {
988 log.finer("SunToolkit.getScaledIconData: " +
989 "Perhaps the image passed into Java is broken. Skipping this icon.");
990 }
991 return null;
992 }
993 Raster raster = bimage.getRaster();
994 DataBuffer buffer = raster.getDataBuffer();
995 return (DataBufferInt)buffer;
996 }
997
998 protected EventQueue getSystemEventQueueImpl() {
999 return getSystemEventQueueImplPP();
1000 }
1001
1002 // Package private implementation
1003 static EventQueue getSystemEventQueueImplPP() {
1004 return getSystemEventQueueImplPP(AppContext.getAppContext());
1005 }
1006
1007 public static EventQueue getSystemEventQueueImplPP(AppContext appContext) {
1008 EventQueue theEventQueue =
1009 (EventQueue)appContext.get(AppContext.EVENT_QUEUE_KEY);
1010 return theEventQueue;
1011 }
1012
1013 /**
1014 * Give native peers the ability to query the native container
1015 * given a native component (eg the direct parent may be lightweight).
1016 */
1017 public static Container getNativeContainer(Component c) {
1018 return Toolkit.getNativeContainer(c);
1019 }
1020
1021 /**
1022 * Gives native peers the ability to query the closest HW component.
1023 * If the given component is heavyweight, then it returns this. Otherwise,
1024 * it goes one level up in the hierarchy and tests next component.
1025 */
1026 public static Component getHeavyweightComponent(Component c) {
1027 while (c != null && AWTAccessor.getComponentAccessor().isLightweight(c)) {
1028 c = AWTAccessor.getComponentAccessor().getParent(c);
1029 }
1030 return c;
1031 }
1032
1033 /**
1034 * Returns key modifiers used by Swing to set up a focus accelerator key stroke.
1035 */
1036 public int getFocusAcceleratorKeyMask() {
1037 return InputEvent.ALT_MASK;
1038 }
1039
1040 /**
1041 * Tests whether specified key modifiers mask can be used to enter a printable
1042 * character. This is a default implementation of this method, which reflects
1043 * the way things work on Windows: here, pressing ctrl + alt allows user to enter
1044 * characters from the extended character set (like euro sign or math symbols)
1045 */
1046 public boolean isPrintableCharacterModifiersMask(int mods) {
1047 return ((mods & InputEvent.ALT_MASK) == (mods & InputEvent.CTRL_MASK));
1048 }
1049
1050 /**
1051 * Returns whether popup is allowed to be shown above the task bar.
1052 * This is a default implementation of this method, which checks
1053 * corresponding security permission.
1054 */
1055 public boolean canPopupOverlapTaskBar() {
1056 boolean result = true;
1057 try {
1058 SecurityManager sm = System.getSecurityManager();
1059 if (sm != null) {
1060 sm.checkPermission(
1061 SecurityConstants.AWT.SET_WINDOW_ALWAYS_ON_TOP_PERMISSION);
1062 }
1063 } catch (SecurityException se) {
1064 // There is no permission to show popups over the task bar
1065 result = false;
1066 }
1067 return result;
1068 }
1069
1070 /**
1071 * Returns a new input method window, with behavior as specified in
1072 * {@link java.awt.im.spi.InputMethodContext#createInputMethodWindow}.
1073 * If the inputContext is not null, the window should return it from its
1074 * getInputContext() method. The window needs to implement
1075 * sun.awt.im.InputMethodWindow.
1076 * <p>
1077 * SunToolkit subclasses can override this method to return better input
1078 * method windows.
1079 */
1080 public Window createInputMethodWindow(String title, InputContext context) {
1081 return new sun.awt.im.SimpleInputMethodWindow(title, context);
1082 }
1083
1084 /**
1085 * Returns whether enableInputMethods should be set to true for peered
1086 * TextComponent instances on this platform. False by default.
1087 */
1088 public boolean enableInputMethodsForTextComponent() {
1089 return false;
1090 }
1091
1092 private static Locale startupLocale = null;
1093
1094 /**
1095 * Returns the locale in which the runtime was started.
1096 */
1097 public static Locale getStartupLocale() {
1098 if (startupLocale == null) {
1099 String language, region, country, variant;
1100 language = AccessController.doPrivileged(
1101 new GetPropertyAction("user.language", "en"));
1102 // for compatibility, check for old user.region property
1103 region = AccessController.doPrivileged(
1104 new GetPropertyAction("user.region"));
1105 if (region != null) {
1106 // region can be of form country, country_variant, or _variant
1107 int i = region.indexOf('_');
1108 if (i >= 0) {
1109 country = region.substring(0, i);
1110 variant = region.substring(i + 1);
1111 } else {
1112 country = region;
1113 variant = "";
1114 }
1115 } else {
1116 country = AccessController.doPrivileged(
1117 new GetPropertyAction("user.country", ""));
1118 variant = AccessController.doPrivileged(
1119 new GetPropertyAction("user.variant", ""));
1120 }
1121 startupLocale = new Locale(language, country, variant);
1122 }
1123 return startupLocale;
1124 }
1125
1126 /**
1127 * Returns the default keyboard locale of the underlying operating system
1128 */
1129 public Locale getDefaultKeyboardLocale() {
1130 return getStartupLocale();
1131 }
1132
1133 private static String dataTransfererClassName = null;
1134
1135 protected static void setDataTransfererClassName(String className) {
1136 dataTransfererClassName = className;
1137 }
1138
1139 public static String getDataTransfererClassName() {
1140 if (dataTransfererClassName == null) {
1141 Toolkit.getDefaultToolkit(); // transferer set during toolkit init
1142 }
1143 return dataTransfererClassName;
1144 }
1145
1146 // Support for window closing event notifications
1147 private transient WindowClosingListener windowClosingListener = null;
1148 /**
1149 * @see sun.awt.WindowClosingSupport#getWindowClosingListener
1150 */
1151 public WindowClosingListener getWindowClosingListener() {
1152 return windowClosingListener;
1153 }
1154 /**
1155 * @see sun.awt.WindowClosingSupport#setWindowClosingListener
1156 */
1157 public void setWindowClosingListener(WindowClosingListener wcl) {
1158 windowClosingListener = wcl;
1159 }
1160
1161 /**
1162 * @see sun.awt.WindowClosingListener#windowClosingNotify
1163 */
1164 public RuntimeException windowClosingNotify(WindowEvent event) {
1165 if (windowClosingListener != null) {
1166 return windowClosingListener.windowClosingNotify(event);
1167 } else {
1168 return null;
1169 }
1170 }
1171 /**
1172 * @see sun.awt.WindowClosingListener#windowClosingDelivered
1173 */
1174 public RuntimeException windowClosingDelivered(WindowEvent event) {
1175 if (windowClosingListener != null) {
1176 return windowClosingListener.windowClosingDelivered(event);
1177 } else {
1178 return null;
1179 }
1180 }
1181
1182 private static DefaultMouseInfoPeer mPeer = null;
1183
1184 protected synchronized MouseInfoPeer getMouseInfoPeer() {
1185 if (mPeer == null) {
1186 mPeer = new DefaultMouseInfoPeer();
1187 }
1188 return mPeer;
1189 }
1190
1191
1192 /**
1193 * Returns whether default toolkit needs the support of the xembed
1194 * from embedding host(if any).
1195 * @return <code>true</code>, if XEmbed is needed, <code>false</code> otherwise
1196 */
1197 public static boolean needsXEmbed() {
1198 String noxembed = AccessController.
1199 doPrivileged(new GetPropertyAction("sun.awt.noxembed", "false"));
1200 if ("true".equals(noxembed)) {
1201 return false;
1202 }
1203
1204 Toolkit tk = Toolkit.getDefaultToolkit();
1205 if (tk instanceof SunToolkit) {
1206 // SunToolkit descendants should override this method to specify
1207 // concrete behavior
1208 return ((SunToolkit)tk).needsXEmbedImpl();
1209 } else {
1210 // Non-SunToolkit doubtly might support XEmbed
1211 return false;
1212 }
1213 }
1214
1215 /**
1216 * Returns whether this toolkit needs the support of the xembed
1217 * from embedding host(if any).
1218 * @return <code>true</code>, if XEmbed is needed, <code>false</code> otherwise
1219 */
1220 protected boolean needsXEmbedImpl() {
1221 return false;
1222 }
1223
1224 private static Dialog.ModalExclusionType DEFAULT_MODAL_EXCLUSION_TYPE = null;
1225
1226 /**
1227 * Returns whether the XEmbed server feature is requested by
1228 * developer. If true, Toolkit should return an
1229 * XEmbed-server-enabled CanvasPeer instead of the ordinary CanvasPeer.
1230 */
1231 protected final boolean isXEmbedServerRequested() {
1232 return AccessController.doPrivileged(new GetBooleanAction("sun.awt.xembedserver"));
1233 }
1234
1235 /**
1236 * Returns whether the modal exclusion API is supported by the current toolkit.
1237 * When it isn't supported, calling <code>setModalExcluded</code> has no
1238 * effect, and <code>isModalExcluded</code> returns false for all windows.
1239 *
1240 * @return true if modal exclusion is supported by the toolkit, false otherwise
1241 *
1242 * @see sun.awt.SunToolkit#setModalExcluded(java.awt.Window)
1243 * @see sun.awt.SunToolkit#isModalExcluded(java.awt.Window)
1244 *
1245 * @since 1.5
1246 */
1247 public static boolean isModalExcludedSupported()
1248 {
1249 Toolkit tk = Toolkit.getDefaultToolkit();
1250 return tk.isModalExclusionTypeSupported(DEFAULT_MODAL_EXCLUSION_TYPE);
1251 }
1252 /*
1253 * Default implementation for isModalExcludedSupportedImpl(), returns false.
1254 *
1255 * @see sun.awt.windows.WToolkit#isModalExcludeSupportedImpl
1256 * @see sun.awt.X11.XToolkit#isModalExcludeSupportedImpl
1257 *
1258 * @since 1.5
1259 */
1260 protected boolean isModalExcludedSupportedImpl()
1261 {
1262 return false;
1263 }
1264
1265 /*
1266 * Sets this window to be excluded from being modally blocked. When the
1267 * toolkit supports modal exclusion and this method is called, input
1268 * events, focus transfer and z-order will continue to work for the
1269 * window, it's owned windows and child components, even in the
1270 * presence of a modal dialog.
1271 * For details on which <code>Window</code>s are normally blocked
1272 * by modal dialog, see {@link java.awt.Dialog}.
1273 * Invoking this method when the modal exclusion API is not supported by
1274 * the current toolkit has no effect.
1275 * @param window Window to be marked as not modally blocked
1276 * @see java.awt.Dialog
1277 * @see java.awt.Dialog#setModal(boolean)
1278 * @see sun.awt.SunToolkit#isModalExcludedSupported
1279 * @see sun.awt.SunToolkit#isModalExcluded(java.awt.Window)
1280 */
1281 public static void setModalExcluded(Window window)
1282 {
1283 if (DEFAULT_MODAL_EXCLUSION_TYPE == null) {
1284 DEFAULT_MODAL_EXCLUSION_TYPE = Dialog.ModalExclusionType.APPLICATION_EXCLUDE;
1285 }
1286 window.setModalExclusionType(DEFAULT_MODAL_EXCLUSION_TYPE);
1287 }
1288
1289 /*
1290 * Returns whether the specified window is blocked by modal dialogs.
1291 * If the modal exclusion API isn't supported by the current toolkit,
1292 * it returns false for all windows.
1293 *
1294 * @param window Window to test for modal exclusion
1295 *
1296 * @return true if the window is modal excluded, false otherwise. If
1297 * the modal exclusion isn't supported by the current Toolkit, false
1298 * is returned
1299 *
1300 * @see sun.awt.SunToolkit#isModalExcludedSupported
1301 * @see sun.awt.SunToolkit#setModalExcluded(java.awt.Window)
1302 *
1303 * @since 1.5
1304 */
1305 public static boolean isModalExcluded(Window window)
1306 {
1307 if (DEFAULT_MODAL_EXCLUSION_TYPE == null) {
1308 DEFAULT_MODAL_EXCLUSION_TYPE = Dialog.ModalExclusionType.APPLICATION_EXCLUDE;
1309 }
1310 return window.getModalExclusionType().compareTo(DEFAULT_MODAL_EXCLUSION_TYPE) >= 0;
1311 }
1312
1313 /**
1314 * Overridden in XToolkit and WToolkit
1315 */
1316 public boolean isModalityTypeSupported(Dialog.ModalityType modalityType) {
1317 return (modalityType == Dialog.ModalityType.MODELESS) ||
1318 (modalityType == Dialog.ModalityType.APPLICATION_MODAL);
1319 }
1320
1321 /**
1322 * Overridden in XToolkit and WToolkit
1323 */
1324 public boolean isModalExclusionTypeSupported(Dialog.ModalExclusionType exclusionType) {
1325 return (exclusionType == Dialog.ModalExclusionType.NO_EXCLUDE);
1326 }
1327
1328 ///////////////////////////////////////////////////////////////////////////
1329 //
1330 // The following is used by the Java Plug-in to coordinate dialog modality
1331 // between containing applications (browsers, ActiveX containers etc) and
1332 // the AWT.
1333 //
1334 ///////////////////////////////////////////////////////////////////////////
1335
1336 private ModalityListenerList modalityListeners = new ModalityListenerList();
1337
1338 public void addModalityListener(ModalityListener listener) {
1339 modalityListeners.add(listener);
1340 }
1341
1342 public void removeModalityListener(ModalityListener listener) {
1343 modalityListeners.remove(listener);
1344 }
1345
1346 public void notifyModalityPushed(Dialog dialog) {
1347 notifyModalityChange(ModalityEvent.MODALITY_PUSHED, dialog);
1348 }
1349
1350 public void notifyModalityPopped(Dialog dialog) {
1351 notifyModalityChange(ModalityEvent.MODALITY_POPPED, dialog);
1352 }
1353
1354 final void notifyModalityChange(int id, Dialog source) {
1355 ModalityEvent ev = new ModalityEvent(source, modalityListeners, id);
1356 ev.dispatch();
1357 }
1358
1359 static class ModalityListenerList implements ModalityListener {
1360
1361 Vector<ModalityListener> listeners = new Vector<ModalityListener>();
1362
1363 void add(ModalityListener listener) {
1364 listeners.addElement(listener);
1365 }
1366
1367 void remove(ModalityListener listener) {
1368 listeners.removeElement(listener);
1369 }
1370
1371 public void modalityPushed(ModalityEvent ev) {
1372 Iterator<ModalityListener> it = listeners.iterator();
1373 while (it.hasNext()) {
1374 it.next().modalityPushed(ev);
1375 }
1376 }
1377
1378 public void modalityPopped(ModalityEvent ev) {
1379 Iterator<ModalityListener> it = listeners.iterator();
1380 while (it.hasNext()) {
1381 it.next().modalityPopped(ev);
1382 }
1383 }
1384 } // end of class ModalityListenerList
1385
1386 ///////////////////////////////////////////////////////////////////////////
1387 // End Plug-in code
1388 ///////////////////////////////////////////////////////////////////////////
1389
1390 public static boolean isLightweightOrUnknown(Component comp) {
1391 if (comp.isLightweight()
1392 || !(getDefaultToolkit() instanceof SunToolkit))
1393 {
1394 return true;
1395 }
1396 return !(comp instanceof Button
1397 || comp instanceof Canvas
1398 || comp instanceof Checkbox
1399 || comp instanceof Choice
1400 || comp instanceof Label
1401 || comp instanceof java.awt.List
1402 || comp instanceof Panel
1403 || comp instanceof Scrollbar
1404 || comp instanceof ScrollPane
1405 || comp instanceof TextArea
1406 || comp instanceof TextField
1407 || comp instanceof Window);
1408 }
1409
1410 @SuppressWarnings("serial")
1411 public static class OperationTimedOut extends RuntimeException {
1412 public OperationTimedOut(String msg) {
1413 super(msg);
1414 }
1415 public OperationTimedOut() {
1416 }
1417 }
1418
1419 @SuppressWarnings("serial")
1420 public static class InfiniteLoop extends RuntimeException {
1421 }
1422
1423 @SuppressWarnings("serial")
1424 public static class IllegalThreadException extends RuntimeException {
1425 public IllegalThreadException(String msg) {
1426 super(msg);
1427 }
1428 public IllegalThreadException() {
1429 }
1430 }
1431
1432 public static final int DEFAULT_WAIT_TIME = 10000;
1433 private static final int MAX_ITERS = 20;
1434 private static final int MIN_ITERS = 0;
1435 private static final int MINIMAL_EDELAY = 0;
1436
1437 /**
1438 * Parameterless version of realsync which uses default timout (see DEFAUL_WAIT_TIME).
1439 */
1440 public void realSync() throws OperationTimedOut, InfiniteLoop {
1441 realSync(DEFAULT_WAIT_TIME);
1442 }
1443
1444 /**
1445 * Forces toolkit to synchronize with the native windowing
1446 * sub-system, flushing all pending work and waiting for all the
1447 * events to be processed. This method guarantees that after
1448 * return no additional Java events will be generated, unless
1449 * cause by user. Obviously, the method cannot be used on the
1450 * event dispatch thread (EDT). In case it nevertheless gets
1451 * invoked on this thread, the method throws the
1452 * IllegalThreadException runtime exception.
1453 *
1454 * <p> This method allows to write tests without explicit timeouts
1455 * or wait for some event. Example:
1456 * <code>
1457 * Frame f = ...;
1458 * f.setVisible(true);
1459 * ((SunToolkit)Toolkit.getDefaultToolkit()).realSync();
1460 * </code>
1461 *
1462 * <p> After realSync, <code>f</code> will be completely visible
1463 * on the screen, its getLocationOnScreen will be returning the
1464 * right result and it will be the focus owner.
1465 *
1466 * <p> Another example:
1467 * <code>
1468 * b.requestFocus();
1469 * ((SunToolkit)Toolkit.getDefaultToolkit()).realSync();
1470 * </code>
1471 *
1472 * <p> After realSync, <code>b</code> will be focus owner.
1473 *
1474 * <p> Notice that realSync isn't guaranteed to work if recurring
1475 * actions occur, such as if during processing of some event
1476 * another request which may generate some events occurs. By
1477 * default, sync tries to perform as much as {@value MAX_ITERS}
1478 * cycles of event processing, allowing for roughly {@value
1479 * MAX_ITERS} additional requests.
1480 *
1481 * <p> For example, requestFocus() generates native request, which
1482 * generates one or two Java focus events, which then generate a
1483 * serie of paint events, a serie of Java focus events, which then
1484 * generate a serie of paint events which then are processed -
1485 * three cycles, minimum.
1486 *
1487 * @param timeout the maximum time to wait in milliseconds, negative means "forever".
1488 */
1489 public void realSync(final long timeout) throws OperationTimedOut, InfiniteLoop
1490 {
1491 if (EventQueue.isDispatchThread()) {
1492 throw new IllegalThreadException("The SunToolkit.realSync() method cannot be used on the event dispatch thread (EDT).");
1493 }
1494 int bigLoop = 0;
1495 do {
1496 // Let's do sync first
1497 sync();
1498
1499 // During the wait process, when we were processing incoming
1500 // events, we could have made some new request, which can
1501 // generate new events. Example: MapNotify/XSetInputFocus.
1502 // Therefore, we dispatch them as long as there is something
1503 // to dispatch.
1504 int iters = 0;
1505 while (iters < MIN_ITERS) {
1506 syncNativeQueue(timeout);
1507 iters++;
1508 }
1509 while (syncNativeQueue(timeout) && iters < MAX_ITERS) {
1510 iters++;
1511 }
1512 if (iters >= MAX_ITERS) {
1513 throw new InfiniteLoop();
1514 }
1515
1516 // native requests were dispatched by X/Window Manager or Windows
1517 // Moreover, we processed them all on Toolkit thread
1518 // Now wait while EDT processes them.
1519 //
1520 // During processing of some events (focus, for example),
1521 // some other events could have been generated. So, after
1522 // waitForIdle, we may end up with full EventQueue
1523 iters = 0;
1524 while (iters < MIN_ITERS) {
1525 waitForIdle(timeout);
1526 iters++;
1527 }
1528 while (waitForIdle(timeout) && iters < MAX_ITERS) {
1529 iters++;
1530 }
1531 if (iters >= MAX_ITERS) {
1532 throw new InfiniteLoop();
1533 }
1534
1535 bigLoop++;
1536 // Again, for Java events, it was simple to check for new Java
1537 // events by checking event queue, but what if Java events
1538 // resulted in native requests? Therefor, check native events again.
1539 } while ((syncNativeQueue(timeout) || waitForIdle(timeout)) && bigLoop < MAX_ITERS);
1540 }
1541
1542 /**
1543 * Platform toolkits need to implement this method to perform the
1544 * sync of the native queue. The method should wait until native
1545 * requests are processed, all native events are processed and
1546 * corresponding Java events are generated. Should return
1547 * <code>true</code> if some events were processed,
1548 * <code>false</code> otherwise.
1549 */
1550 protected abstract boolean syncNativeQueue(final long timeout);
1551
1552 private boolean eventDispatched = false;
1553 private boolean queueEmpty = false;
1554 private final Object waitLock = "Wait Lock";
1555
1556 private boolean isEQEmpty() {
1557 EventQueue queue = getSystemEventQueueImpl();
1558 return AWTAccessor.getEventQueueAccessor().noEvents(queue);
1559 }
1560
1561 /**
1562 * Waits for the Java event queue to empty. Ensures that all
1563 * events are processed (including paint events), and that if
1564 * recursive events were generated, they are also processed.
1565 * Should return <code>true</code> if more processing is
1566 * necessary, <code>false</code> otherwise.
1567 */
1568 @SuppressWarnings("serial")
1569 protected final boolean waitForIdle(final long timeout) {
1570 flushPendingEvents();
1571 boolean queueWasEmpty = isEQEmpty();
1572 queueEmpty = false;
1573 eventDispatched = false;
1574 synchronized(waitLock) {
1575 postEvent(AppContext.getAppContext(),
1576 new PeerEvent(getSystemEventQueueImpl(), null, PeerEvent.LOW_PRIORITY_EVENT) {
1577 public void dispatch() {
1578 // Here we block EDT. It could have some
1579 // events, it should have dispatched them by
1580 // now. So native requests could have been
1581 // generated. First, dispatch them. Then,
1582 // flush Java events again.
1583 int iters = 0;
1584 while (iters < MIN_ITERS) {
1585 syncNativeQueue(timeout);
1586 iters++;
1587 }
1588 while (syncNativeQueue(timeout) && iters < MAX_ITERS) {
1589 iters++;
1590 }
1591 flushPendingEvents();
1592
1593 synchronized(waitLock) {
1594 queueEmpty = isEQEmpty();
1595 eventDispatched = true;
1596 waitLock.notifyAll();
1597 }
1598 }
1599 });
1600 try {
1601 while (!eventDispatched) {
1602 waitLock.wait();
1603 }
1604 } catch (InterruptedException ie) {
1605 return false;
1606 }
1607 }
1608
1609 try {
1610 Thread.sleep(MINIMAL_EDELAY);
1611 } catch (InterruptedException ie) {
1612 throw new RuntimeException("Interrupted");
1613 }
1614
1615 flushPendingEvents();
1616
1617 // Lock to force write-cache flush for queueEmpty.
1618 synchronized (waitLock) {
1619 return !(queueEmpty && isEQEmpty() && queueWasEmpty);
1620 }
1621 }
1622
1623 /**
1624 * Grabs the mouse input for the given window. The window must be
1625 * visible. The window or its children do not receive any
1626 * additional mouse events besides those targeted to them. All
1627 * other events will be dispatched as before - to the respective
1628 * targets. This Window will receive UngrabEvent when automatic
1629 * ungrab is about to happen. The event can be listened to by
1630 * installing AWTEventListener with WINDOW_EVENT_MASK. See
1631 * UngrabEvent class for the list of conditions when ungrab is
1632 * about to happen.
1633 * @see UngrabEvent
1634 */
1635 public abstract void grab(Window w);
1636
1637 /**
1638 * Forces ungrab. No event will be sent.
1639 */
1640 public abstract void ungrab(Window w);
1641
1642
1643 /**
1644 * Locates the splash screen library in a platform dependent way and closes
1645 * the splash screen. Should be invoked on first top-level frame display.
1646 * @see java.awt.SplashScreen
1647 * @since 1.6
1648 */
1649 public static native void closeSplashScreen();
1650
1651 /* The following methods and variables are to support retrieving
1652 * desktop text anti-aliasing settings
1653 */
1654
1655 /* Need an instance method because setDesktopProperty(..) is protected. */
1656 private void fireDesktopFontPropertyChanges() {
1657 setDesktopProperty(SunToolkit.DESKTOPFONTHINTS,
1658 SunToolkit.getDesktopFontHints());
1659 }
1660
1661 private static boolean checkedSystemAAFontSettings;
1662 private static boolean useSystemAAFontSettings;
1663 private static boolean lastExtraCondition = true;
1664 private static RenderingHints desktopFontHints;
1665
1666 /* Since Swing is the reason for this "extra condition" logic its
1667 * worth documenting it in some detail.
1668 * First, a goal is for Swing and applications to both retrieve and
1669 * use the same desktop property value so that there is complete
1670 * consistency between the settings used by JDK's Swing implementation
1671 * and 3rd party custom Swing components, custom L&Fs and any general
1672 * text rendering that wants to be consistent with these.
1673 * But by default on Solaris & Linux Swing will not use AA text over
1674 * remote X11 display (unless Xrender can be used which is TBD and may not
1675 * always be available anyway) as that is a noticeable performance hit.
1676 * So there needs to be a way to express that extra condition so that
1677 * it is seen by all clients of the desktop property API.
1678 * If this were the only condition it could be handled here as it would
1679 * be the same for any L&F and could reasonably be considered to be
1680 * a static behaviour of those systems.
1681 * But GTK currently has an additional test based on locale which is
1682 * not applied by Metal. So mixing GTK in a few locales with Metal
1683 * would mean the last one wins.
1684 * This could be stored per-app context which would work
1685 * for different applets, but wouldn't help for a single application
1686 * using GTK and some other L&F concurrently.
1687 * But it is expected this will be addressed within GTK and the font
1688 * system so is a temporary and somewhat unlikely harmless corner case.
1689 */
1690 public static void setAAFontSettingsCondition(boolean extraCondition) {
1691 if (extraCondition != lastExtraCondition) {
1692 lastExtraCondition = extraCondition;
1693 if (checkedSystemAAFontSettings) {
1694 /* Someone already asked for this info, under a different
1695 * condition.
1696 * We'll force re-evaluation instead of replicating the
1697 * logic, then notify any listeners of any change.
1698 */
1699 checkedSystemAAFontSettings = false;
1700 Toolkit tk = Toolkit.getDefaultToolkit();
1701 if (tk instanceof SunToolkit) {
1702 ((SunToolkit)tk).fireDesktopFontPropertyChanges();
1703 }
1704 }
1705 }
1706 }
1707
1708 /* "false", "off", ""default" aren't explicitly tested, they
1709 * just fall through to produce a null return which all are equated to
1710 * "false".
1711 */
1712 private static RenderingHints getDesktopAAHintsByName(String hintname) {
1713 Object aaHint = null;
1714 hintname = hintname.toLowerCase(Locale.ENGLISH);
1715 if (hintname.equals("on")) {
1716 aaHint = VALUE_TEXT_ANTIALIAS_ON;
1717 } else if (hintname.equals("gasp")) {
1718 aaHint = VALUE_TEXT_ANTIALIAS_GASP;
1719 } else if (hintname.equals("lcd") || hintname.equals("lcd_hrgb")) {
1720 aaHint = VALUE_TEXT_ANTIALIAS_LCD_HRGB;
1721 } else if (hintname.equals("lcd_hbgr")) {
1722 aaHint = VALUE_TEXT_ANTIALIAS_LCD_HBGR;
1723 } else if (hintname.equals("lcd_vrgb")) {
1724 aaHint = VALUE_TEXT_ANTIALIAS_LCD_VRGB;
1725 } else if (hintname.equals("lcd_vbgr")) {
1726 aaHint = VALUE_TEXT_ANTIALIAS_LCD_VBGR;
1727 }
1728 if (aaHint != null) {
1729 RenderingHints map = new RenderingHints(null);
1730 map.put(KEY_TEXT_ANTIALIASING, aaHint);
1731 return map;
1732 } else {
1733 return null;
1734 }
1735 }
1736
1737 /* This method determines whether to use the system font settings,
1738 * or ignore them if a L&F has specified they should be ignored, or
1739 * to override both of these with a system property specified value.
1740 * If the toolkit isn't a SunToolkit, (eg may be headless) then that
1741 * system property isn't applied as desktop properties are considered
1742 * to be inapplicable in that case. In that headless case although
1743 * this method will return "true" the toolkit will return a null map.
1744 */
1745 private static boolean useSystemAAFontSettings() {
1746 if (!checkedSystemAAFontSettings) {
1747 useSystemAAFontSettings = true; /* initially set this true */
1748 String systemAAFonts = null;
1749 Toolkit tk = Toolkit.getDefaultToolkit();
1750 if (tk instanceof SunToolkit) {
1751 systemAAFonts =
1752 AccessController.doPrivileged(
1753 new GetPropertyAction("awt.useSystemAAFontSettings"));
1754 }
1755 if (systemAAFonts != null) {
1756 useSystemAAFontSettings =
1757 Boolean.valueOf(systemAAFonts).booleanValue();
1758 /* If it is anything other than "true", then it may be
1759 * a hint name , or it may be "off, "default", etc.
1760 */
1761 if (!useSystemAAFontSettings) {
1762 desktopFontHints = getDesktopAAHintsByName(systemAAFonts);
1763 }
1764 }
1765 /* If its still true, apply the extra condition */
1766 if (useSystemAAFontSettings) {
1767 useSystemAAFontSettings = lastExtraCondition;
1768 }
1769 checkedSystemAAFontSettings = true;
1770 }
1771 return useSystemAAFontSettings;
1772 }
1773
1774 /* A variable defined for the convenience of JDK code */
1775 public static final String DESKTOPFONTHINTS = "awt.font.desktophints";
1776
1777 /* Overridden by subclasses to return platform/desktop specific values */
1778 protected RenderingHints getDesktopAAHints() {
1779 return null;
1780 }
1781
1782 /* Subclass desktop property loading methods call this which
1783 * in turn calls the appropriate subclass implementation of
1784 * getDesktopAAHints() when system settings are being used.
1785 * Its public rather than protected because subclasses may delegate
1786 * to a helper class.
1787 */
1788 public static RenderingHints getDesktopFontHints() {
1789 if (useSystemAAFontSettings()) {
1790 Toolkit tk = Toolkit.getDefaultToolkit();
1791 if (tk instanceof SunToolkit) {
1792 Object map = ((SunToolkit)tk).getDesktopAAHints();
1793 return (RenderingHints)map;
1794 } else { /* Headless Toolkit */
1795 return null;
1796 }
1797 } else if (desktopFontHints != null) {
1798 /* cloning not necessary as the return value is cloned later, but
1799 * its harmless.
1800 */
1801 return (RenderingHints)(desktopFontHints.clone());
1802 } else {
1803 return null;
1804 }
1805 }
1806
1807
1808 public abstract boolean isDesktopSupported();
1809
1810 /*
1811 * consumeNextKeyTyped() method is not currently used,
1812 * however Swing could use it in the future.
1813 */
1814 public static synchronized void consumeNextKeyTyped(KeyEvent keyEvent) {
1815 try {
1816 AWTAccessor.getDefaultKeyboardFocusManagerAccessor().consumeNextKeyTyped(
1817 (DefaultKeyboardFocusManager)KeyboardFocusManager.
1818 getCurrentKeyboardFocusManager(),
1819 keyEvent);
1820 } catch (ClassCastException cce) {
1821 cce.printStackTrace();
1822 }
1823 }
1824
1825 protected static void dumpPeers(final PlatformLogger aLog) {
1826 AWTAutoShutdown.getInstance().dumpPeers(aLog);
1827 }
1828
1829 /**
1830 * Returns the <code>Window</code> ancestor of the component <code>comp</code>.
1831 * @return Window ancestor of the component or component by itself if it is Window;
1832 * null, if component is not a part of window hierarchy
1833 */
1834 public static Window getContainingWindow(Component comp) {
1835 while (comp != null && !(comp instanceof Window)) {
1836 comp = comp.getParent();
1837 }
1838 return (Window)comp;
1839 }
1840
1841 private static Boolean sunAwtDisableMixing = null;
1842
1843 /**
1844 * Returns the value of "sun.awt.disableMixing" property. Default
1845 * value is {@code false}.
1846 */
1847 public synchronized static boolean getSunAwtDisableMixing() {
1848 if (sunAwtDisableMixing == null) {
1849 sunAwtDisableMixing = AccessController.doPrivileged(
1850 new GetBooleanAction("sun.awt.disableMixing"));
1851 }
1852 return sunAwtDisableMixing.booleanValue();
1853 }
1854
1855 /**
1856 * Returns true if the native GTK libraries are available. The
1857 * default implementation returns false, but UNIXToolkit overrides this
1858 * method to provide a more specific answer.
1859 */
1860 public boolean isNativeGTKAvailable() {
1861 return false;
1862 }
1863
1864 private static final Object DEACTIVATION_TIMES_MAP_KEY = new Object();
1865
1866 public synchronized void setWindowDeactivationTime(Window w, long time) {
1867 AppContext ctx = getAppContext(w);
1868 WeakHashMap<Window, Long> map = (WeakHashMap<Window, Long>)ctx.get(DEACTIVATION_TIMES_MAP_KEY);
1869 if (map == null) {
1870 map = new WeakHashMap<Window, Long>();
1871 ctx.put(DEACTIVATION_TIMES_MAP_KEY, map);
1872 }
1873 map.put(w, time);
1874 }
1875
1876 public synchronized long getWindowDeactivationTime(Window w) {
1877 AppContext ctx = getAppContext(w);
1878 WeakHashMap<Window, Long> map = (WeakHashMap<Window, Long>)ctx.get(DEACTIVATION_TIMES_MAP_KEY);
1879 if (map == null) {
1880 return -1;
1881 }
1882 Long time = map.get(w);
1883 return time == null ? -1 : time;
1884 }
1885
1886 // Cosntant alpha
1887 public boolean isWindowOpacitySupported() {
1888 return false;
1889 }
1890
1891 // Shaping
1892 public boolean isWindowShapingSupported() {
1893 return false;
1894 }
1895
1896 // Per-pixel alpha
1897 public boolean isWindowTranslucencySupported() {
1898 return false;
1899 }
1900
1901 public boolean isTranslucencyCapable(GraphicsConfiguration gc) {
1902 return false;
1903 }
1904
1905 /**
1906 * Returns true if swing backbuffer should be translucent.
1907 */
1908 public boolean isSwingBackbufferTranslucencySupported() {
1909 return false;
1910 }
1911
1912 /**
1913 * Returns whether or not a containing top level window for the passed
1914 * component is
1915 * {@link GraphicsDevice.WindowTranslucency#PERPIXEL_TRANSLUCENT PERPIXEL_TRANSLUCENT}.
1916 *
1917 * @param c a Component which toplevel's to check
1918 * @return {@code true} if the passed component is not null and has a
1919 * containing toplevel window which is opaque (so per-pixel translucency
1920 * is not enabled), {@code false} otherwise
1921 * @see GraphicsDevice.WindowTranslucency#PERPIXEL_TRANSLUCENT
1922 */
1923 public static boolean isContainingTopLevelOpaque(Component c) {
1924 Window w = getContainingWindow(c);
1925 return w != null && w.isOpaque();
1926 }
1927
1928 /**
1929 * Returns whether or not a containing top level window for the passed
1930 * component is
1931 * {@link GraphicsDevice.WindowTranslucency#TRANSLUCENT TRANSLUCENT}.
1932 *
1933 * @param c a Component which toplevel's to check
1934 * @return {@code true} if the passed component is not null and has a
1935 * containing toplevel window which has opacity less than
1936 * 1.0f (which means that it is translucent), {@code false} otherwise
1937 * @see GraphicsDevice.WindowTranslucency#TRANSLUCENT
1938 */
1939 public static boolean isContainingTopLevelTranslucent(Component c) {
1940 Window w = getContainingWindow(c);
1941 return w != null && w.getOpacity() < 1.0f;
1942 }
1943
1944 /**
1945 * Returns whether the native system requires using the peer.updateWindow()
1946 * method to update the contents of a non-opaque window, or if usual
1947 * painting procedures are sufficient. The default return value covers
1948 * the X11 systems. On MS Windows this method is overriden in WToolkit
1949 * to return true.
1950 */
1951 public boolean needUpdateWindow() {
1952 return false;
1953 }
1954
1955 /**
1956 * Descendants of the SunToolkit should override and put their own logic here.
1957 */
1958 public int getNumberOfButtons(){
1959 return 3;
1960 }
1961
1962 /**
1963 * Checks that the given object implements/extends the given
1964 * interface/class.
1965 *
1966 * Note that using the instanceof operator causes a class to be loaded.
1967 * Using this method doesn't load a class and it can be used instead of
1968 * the instanceof operator for performance reasons.
1969 *
1970 * @param obj Object to be checked
1971 * @param type The name of the interface/class. Must be
1972 * fully-qualified interface/class name.
1973 * @return true, if this object implements/extends the given
1974 * interface/class, false, otherwise, or if obj or type is null
1975 */
1976 public static boolean isInstanceOf(Object obj, String type) {
1977 if (obj == null) return false;
1978 if (type == null) return false;
1979
1980 return isInstanceOf(obj.getClass(), type);
1981 }
1982
1983 private static boolean isInstanceOf(Class<?> cls, String type) {
1984 if (cls == null) return false;
1985
1986 if (cls.getName().equals(type)) {
1987 return true;
1988 }
1989
1990 for (Class<?> c : cls.getInterfaces()) {
1991 if (c.getName().equals(type)) {
1992 return true;
1993 }
1994 }
1995 return isInstanceOf(cls.getSuperclass(), type);
1996 }
1997
1998 ///////////////////////////////////////////////////////////////////////////
1999 //
2000 // The following methods help set and identify whether a particular
2001 // AWTEvent object was produced by the system or by user code. As of this
2002 // writing the only consumer is the Java Plug-In, although this information
2003 // could be useful to more clients and probably should be formalized in
2004 // the public API.
2005 //
2006 ///////////////////////////////////////////////////////////////////////////
2007
2008 public static void setSystemGenerated(AWTEvent e) {
2009 AWTAccessor.getAWTEventAccessor().setSystemGenerated(e);
2010 }
2011
2012 public static boolean isSystemGenerated(AWTEvent e) {
2013 return AWTAccessor.getAWTEventAccessor().isSystemGenerated(e);
2014 }
2015
2016 } // class SunToolkit
2017
2018
2019 /*
2020 * PostEventQueue is a Thread that runs in the same AppContext as the
2021 * Java EventQueue. It is a queue of AWTEvents to be posted to the
2022 * Java EventQueue. The toolkit Thread (AWT-Windows/AWT-Motif) posts
2023 * events to this queue, which then calls EventQueue.postEvent().
2024 *
2025 * We do this because EventQueue.postEvent() may be overridden by client
2026 * code, and we mustn't ever call client code from the toolkit thread.
2027 */
2028 class PostEventQueue {
2029 private EventQueueItem queueHead = null;
2030 private EventQueueItem queueTail = null;
2031 private final EventQueue eventQueue;
2032
2033 private Thread flushThread = null;
2034
2035 PostEventQueue(EventQueue eq) {
2036 eventQueue = eq;
2037 }
2038
2039 /*
2040 * Continually post pending AWTEvents to the Java EventQueue. The method
2041 * is synchronized to ensure the flush is completed before a new event
2042 * can be posted to this queue.
2043 *
2044 * 7177040: The method couldn't be wholly synchronized because of calls
2045 * of EventQueue.postEvent() that uses pushPopLock, otherwise it could
2046 * potentially lead to deadlock
2047 */
2048 public void flush() {
2049
2050 Thread newThread = Thread.currentThread();
2051
2052 try {
2053 EventQueueItem tempQueue;
2054 synchronized (this) {
2055 // Avoid method recursion
2056 if (newThread == flushThread) {
2057 return;
2058 }
2059 // Wait for other threads' flushing
2060 while (flushThread != null) {
2061 wait();
2062 }
2063 // Skip everything if queue is empty
2064 if (queueHead == null) {
2065 return;
2066 }
2067 // Remember flushing thread
2068 flushThread = newThread;
2069
2070 tempQueue = queueHead;
2071 queueHead = queueTail = null;
2072 }
2073 try {
2074 while (tempQueue != null) {
2075 eventQueue.postEvent(tempQueue.event);
2076 tempQueue = tempQueue.next;
2077 }
2078 }
2079 finally {
2080 // Only the flushing thread can get here
2081 synchronized (this) {
2082 // Forget flushing thread, inform other pending threads
2083 flushThread = null;
2084 notifyAll();
2085 }
2086 }
2087 }
2088 catch (InterruptedException e) {
2089 // Couldn't allow exception go up, so at least recover the flag
2090 newThread.interrupt();
2091 }
2092 }
2093
2094 /*
2095 * Enqueue an AWTEvent to be posted to the Java EventQueue.
2096 */
2097 void postEvent(AWTEvent event) {
2098 EventQueueItem item = new EventQueueItem(event);
2099
2100 synchronized (this) {
2101 if (queueHead == null) {
2102 queueHead = queueTail = item;
2103 } else {
2104 queueTail.next = item;
2105 queueTail = item;
2106 }
2107 }
2108 SunToolkit.wakeupEventQueue(eventQueue, event.getSource() == AWTAutoShutdown.getInstance());
2109 }
2110 } // class PostEventQueue