| /******************************************************************************* |
| * Copyright (c) 2007, 2010 Oracle. All rights reserved. |
| * This program and the accompanying materials are made available under the |
| * terms of the Eclipse Public License v1.0, which accompanies this distribution |
| * and is available at http://www.eclipse.org/legal/epl-v10.html. |
| * |
| * Contributors: |
| * Oracle - initial API and implementation |
| ******************************************************************************/ |
| package org.eclipse.jpt.utility.internal.model.listener.awt; |
| |
| import java.awt.EventQueue; |
| |
| import org.eclipse.jpt.utility.model.event.ListAddEvent; |
| import org.eclipse.jpt.utility.model.event.ListChangeEvent; |
| import org.eclipse.jpt.utility.model.event.ListClearEvent; |
| import org.eclipse.jpt.utility.model.event.ListMoveEvent; |
| import org.eclipse.jpt.utility.model.event.ListRemoveEvent; |
| import org.eclipse.jpt.utility.model.event.ListReplaceEvent; |
| import org.eclipse.jpt.utility.model.listener.ListChangeListener; |
| |
| /** |
| * Wrap another list change listener and forward events to it on the AWT |
| * event queue, asynchronously if necessary. If the event arrived on the UI |
| * thread that is probably because it was initiated by a UI widget; as a |
| * result, we want to loop back synchronously so the events can be |
| * short-circuited. |
| */ |
| public final class AWTListChangeListenerWrapper |
| implements ListChangeListener |
| { |
| private final ListChangeListener listener; |
| |
| public AWTListChangeListenerWrapper(ListChangeListener listener) { |
| super(); |
| if (listener == null) { |
| throw new NullPointerException(); |
| } |
| this.listener = listener; |
| } |
| |
| public void itemsAdded(ListAddEvent event) { |
| if (this.isExecutingOnUIThread()) { |
| this.itemsAdded_(event); |
| } else { |
| this.executeOnEventQueue(this.buildItemsAddedRunnable(event)); |
| } |
| } |
| |
| public void itemsRemoved(ListRemoveEvent event) { |
| if (this.isExecutingOnUIThread()) { |
| this.itemsRemoved_(event); |
| } else { |
| this.executeOnEventQueue(this.buildItemsRemovedRunnable(event)); |
| } |
| } |
| |
| public void itemsMoved(ListMoveEvent event) { |
| if (this.isExecutingOnUIThread()) { |
| this.itemsMoved_(event); |
| } else { |
| this.executeOnEventQueue(this.buildItemsMovedRunnable(event)); |
| } |
| } |
| |
| public void itemsReplaced(ListReplaceEvent event) { |
| if (this.isExecutingOnUIThread()) { |
| this.itemsReplaced_(event); |
| } else { |
| this.executeOnEventQueue(this.buildItemsReplacedRunnable(event)); |
| } |
| } |
| |
| public void listCleared(ListClearEvent event) { |
| if (this.isExecutingOnUIThread()) { |
| this.listCleared_(event); |
| } else { |
| this.executeOnEventQueue(this.buildListClearedRunnable(event)); |
| } |
| } |
| |
| public void listChanged(ListChangeEvent event) { |
| if (this.isExecutingOnUIThread()) { |
| this.listChanged_(event); |
| } else { |
| this.executeOnEventQueue(this.buildListChangedRunnable(event)); |
| } |
| } |
| |
| private Runnable buildItemsAddedRunnable(final ListAddEvent event) { |
| return new Runnable() { |
| public void run() { |
| AWTListChangeListenerWrapper.this.itemsAdded_(event); |
| } |
| @Override |
| public String toString() { |
| return "items added"; //$NON-NLS-1$ |
| } |
| }; |
| } |
| |
| private Runnable buildItemsRemovedRunnable(final ListRemoveEvent event) { |
| return new Runnable() { |
| public void run() { |
| AWTListChangeListenerWrapper.this.itemsRemoved_(event); |
| } |
| @Override |
| public String toString() { |
| return "items removed"; //$NON-NLS-1$ |
| } |
| }; |
| } |
| |
| private Runnable buildItemsMovedRunnable(final ListMoveEvent event) { |
| return new Runnable() { |
| public void run() { |
| AWTListChangeListenerWrapper.this.itemsMoved_(event); |
| } |
| @Override |
| public String toString() { |
| return "items moved"; //$NON-NLS-1$ |
| } |
| }; |
| } |
| |
| private Runnable buildItemsReplacedRunnable(final ListReplaceEvent event) { |
| return new Runnable() { |
| public void run() { |
| AWTListChangeListenerWrapper.this.itemsReplaced_(event); |
| } |
| @Override |
| public String toString() { |
| return "items replaced"; //$NON-NLS-1$ |
| } |
| }; |
| } |
| |
| private Runnable buildListClearedRunnable(final ListClearEvent event) { |
| return new Runnable() { |
| public void run() { |
| AWTListChangeListenerWrapper.this.listCleared_(event); |
| } |
| @Override |
| public String toString() { |
| return "list cleared"; //$NON-NLS-1$ |
| } |
| }; |
| } |
| |
| private Runnable buildListChangedRunnable(final ListChangeEvent event) { |
| return new Runnable() { |
| public void run() { |
| AWTListChangeListenerWrapper.this.listChanged_(event); |
| } |
| @Override |
| public String toString() { |
| return "list changed"; //$NON-NLS-1$ |
| } |
| }; |
| } |
| |
| private boolean isExecutingOnUIThread() { |
| return EventQueue.isDispatchThread(); |
| } |
| |
| /** |
| * {@link EventQueue#invokeLater(Runnable)} seems to work OK; |
| * but using {@link EventQueue#invokeAndWait(Runnable)} can sometimes make |
| * things more predictable when debugging, at the risk of deadlocks. |
| */ |
| private void executeOnEventQueue(Runnable r) { |
| EventQueue.invokeLater(r); |
| // try { |
| // EventQueue.invokeAndWait(r); |
| // } catch (InterruptedException ex) { |
| // throw new RuntimeException(ex); |
| // } catch (java.lang.reflect.InvocationTargetException ex) { |
| // throw new RuntimeException(ex); |
| // } |
| } |
| |
| void itemsAdded_(ListAddEvent event) { |
| this.listener.itemsAdded(event); |
| } |
| |
| void itemsRemoved_(ListRemoveEvent event) { |
| this.listener.itemsRemoved(event); |
| } |
| |
| void itemsMoved_(ListMoveEvent event) { |
| this.listener.itemsMoved(event); |
| } |
| |
| void itemsReplaced_(ListReplaceEvent event) { |
| this.listener.itemsReplaced(event); |
| } |
| |
| void listCleared_(ListClearEvent event) { |
| this.listener.listCleared(event); |
| } |
| |
| void listChanged_(ListChangeEvent event) { |
| this.listener.listChanged(event); |
| } |
| |
| @Override |
| public String toString() { |
| return "AWT(" + this.listener.toString() + ')'; //$NON-NLS-1$ |
| } |
| |
| } |