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