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/*
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* Copyright 2000-2007 Sun Microsystems, Inc. All Rights Reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Sun designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Sun in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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* CA 95054 USA or visit www.sun.com if you need additional information or
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* have any questions.
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*/
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package sun.awt;
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import java.awt.IllegalComponentStateException;
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import java.util.Collections;
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import java.util.Iterator;
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import java.util.Map;
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import java.util.Set;
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import java.util.HashMap;
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import java.util.WeakHashMap;
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import java.util.logging.*;
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/**
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* This class is used to aid in keeping track of DisplayChangedListeners and
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* notifying them when a display change has taken place. DisplayChangedListeners
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* are notified when the display's bit depth is changed, or when a top-level
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* window has been dragged onto another screen.
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*
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* It is safe for a DisplayChangedListener to be added while the list is being
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* iterated.
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*
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* The displayChanged() call is propagated after some occurrence (either
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* due to user action or some other application) causes the display mode
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* (e.g., depth or resolution) to change. All heavyweight components need
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* to know when this happens because they need to create new surfaceData
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* objects based on the new depth.
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*
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* displayChanged() is also called on Windows when they are moved from one
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* screen to another on a system equipped with multiple displays.
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*/
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public class SunDisplayChanger {
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private static final Logger log = Logger.getLogger("sun.awt.multiscreen.SunDisplayChanger");
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// Create a new synchronizedMap with initial capacity of one listener.
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// It is asserted that the most common case is to have one GraphicsDevice
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// and one top-level Window.
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private Map listeners = Collections.synchronizedMap(new WeakHashMap(1));
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public SunDisplayChanger() {}
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/*
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* Add a DisplayChangeListener to this SunDisplayChanger so that it is
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* notified when the display is changed.
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*/
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public void add(DisplayChangedListener theListener) {
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if (log.isLoggable(Level.FINE)) {
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if (theListener == null) {
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log.log(Level.FINE, "Assertion (theListener != null) failed");
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}
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}
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if (log.isLoggable(Level.FINER)) {
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log.log(Level.FINER, "Adding listener: " + theListener);
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}
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listeners.put(theListener, null);
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}
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/*
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* Remove the given DisplayChangeListener from this SunDisplayChanger.
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*/
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public void remove(DisplayChangedListener theListener) {
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if (log.isLoggable(Level.FINE)) {
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if (theListener == null) {
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log.log(Level.FINE, "Assertion (theListener != null) failed");
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}
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}
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if (log.isLoggable(Level.FINER)) {
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log.log(Level.FINER, "Removing listener: " + theListener);
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}
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listeners.remove(theListener);
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}
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/*
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* Notify our list of DisplayChangedListeners that a display change has
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* taken place by calling their displayChanged() methods.
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*/
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public void notifyListeners() {
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if (log.isLoggable(Level.FINEST)) {
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log.log(Level.FINEST, "notifyListeners");
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}
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// This method is implemented by making a clone of the set of listeners,
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// and then iterating over the clone. This is because during the course
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// of responding to a display change, it may be appropriate for a
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// DisplayChangedListener to add or remove itself from a SunDisplayChanger.
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// If the set itself were iterated over, rather than a clone, it is
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// trivial to get a ConcurrentModificationException by having a
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// DisplayChangedListener remove itself from its list.
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// Because all display change handling is done on the event thread,
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// synchronization provides no protection against modifying the listener
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// list while in the middle of iterating over it. -bchristi 7/10/2001
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HashMap listClone;
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Set cloneSet;
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synchronized(listeners) {
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listClone = new HashMap(listeners);
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}
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cloneSet = listClone.keySet();
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Iterator itr = cloneSet.iterator();
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while (itr.hasNext()) {
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DisplayChangedListener current =
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(DisplayChangedListener) itr.next();
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try {
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if (log.isLoggable(Level.FINEST)) {
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log.log(Level.FINEST, "displayChanged for listener: " + current);
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}
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current.displayChanged();
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} catch (IllegalComponentStateException e) {
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// This DisplayChangeListener is no longer valid. Most
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// likely, a top-level window was dispose()d, but its
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// Java objects have not yet been garbage collected. In any
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// case, we no longer need to track this listener, though we
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// do need to remove it from the original list, not the clone.
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listeners.remove(current);
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}
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}
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}
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/*
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* Notify our list of DisplayChangedListeners that a palette change has
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* taken place by calling their paletteChanged() methods.
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*/
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public void notifyPaletteChanged() {
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if (log.isLoggable(Level.FINEST)) {
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log.finest("notifyPaletteChanged");
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}
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// This method is implemented by making a clone of the set of listeners,
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// and then iterating over the clone. This is because during the course
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// of responding to a display change, it may be appropriate for a
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// DisplayChangedListener to add or remove itself from a SunDisplayChanger.
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// If the set itself were iterated over, rather than a clone, it is
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// trivial to get a ConcurrentModificationException by having a
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// DisplayChangedListener remove itself from its list.
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// Because all display change handling is done on the event thread,
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// synchronization provides no protection against modifying the listener
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// list while in the middle of iterating over it. -bchristi 7/10/2001
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HashMap listClone;
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Set cloneSet;
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synchronized (listeners) {
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listClone = new HashMap(listeners);
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}
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cloneSet = listClone.keySet();
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Iterator itr = cloneSet.iterator();
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while (itr.hasNext()) {
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DisplayChangedListener current =
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(DisplayChangedListener) itr.next();
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try {
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if (log.isLoggable(Level.FINEST)) {
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log.log(Level.FINEST, "paletteChanged for listener: " + current);
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}
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current.paletteChanged();
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} catch (IllegalComponentStateException e) {
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// This DisplayChangeListener is no longer valid. Most
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// likely, a top-level window was dispose()d, but its
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// Java objects have not yet been garbage collected. In any
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// case, we no longer need to track this listener, though we
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// do need to remove it from the original list, not the clone.
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listeners.remove(current);
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}
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}
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}
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}
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