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