| /******************************************************************************* |
| * Copyright (c) 2007, 2013 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.common.ui.internal.listeners; |
| |
| import org.eclipse.jpt.common.ui.internal.plugin.JptCommonUiPlugin; |
| import org.eclipse.jpt.common.ui.internal.swt.widgets.DisplayTools; |
| import org.eclipse.jpt.common.utility.internal.RunnableAdapter; |
| import org.eclipse.jpt.common.utility.internal.collection.SynchronizedQueue; |
| import org.eclipse.jpt.common.utility.model.event.ListAddEvent; |
| import org.eclipse.jpt.common.utility.model.event.ListChangeEvent; |
| import org.eclipse.jpt.common.utility.model.event.ListClearEvent; |
| import org.eclipse.jpt.common.utility.model.event.ListEvent; |
| import org.eclipse.jpt.common.utility.model.event.ListMoveEvent; |
| import org.eclipse.jpt.common.utility.model.event.ListRemoveEvent; |
| import org.eclipse.jpt.common.utility.model.event.ListReplaceEvent; |
| import org.eclipse.jpt.common.utility.model.listener.ListChangeListener; |
| |
| /** |
| * Wrap another list change listener and forward events to it on the SWT |
| * UI thread, asynchronously if necessary. |
| * |
| * @see SWTPropertyChangeListenerWrapper |
| */ |
| public class SWTListChangeListenerWrapper |
| implements ListChangeListener |
| { |
| private final ListChangeListener listener; |
| private final SynchronizedQueue<ListEvent> events = new SynchronizedQueue<ListEvent>(); |
| |
| |
| public SWTListChangeListenerWrapper(ListChangeListener listener) { |
| super(); |
| if (listener == null) { |
| throw new NullPointerException(); |
| } |
| this.listener = listener; |
| } |
| |
| public void itemsAdded(ListAddEvent event) { |
| this.events.enqueue(event); |
| this.execute(new ForwardEventsRunnable()); |
| } |
| |
| public void itemsRemoved(ListRemoveEvent event) { |
| this.events.enqueue(event); |
| this.execute(new ForwardEventsRunnable()); |
| } |
| |
| public void itemsMoved(ListMoveEvent event) { |
| this.events.enqueue(event); |
| this.execute(new ForwardEventsRunnable()); |
| } |
| |
| public void itemsReplaced(ListReplaceEvent event) { |
| this.events.enqueue(event); |
| this.execute(new ForwardEventsRunnable()); |
| } |
| |
| public void listCleared(ListClearEvent event) { |
| this.events.enqueue(event); |
| this.execute(new ForwardEventsRunnable()); |
| } |
| |
| public void listChanged(ListChangeEvent event) { |
| this.events.enqueue(event); |
| this.execute(new ForwardEventsRunnable()); |
| } |
| |
| /* CU private */ class ForwardEventsRunnable |
| extends RunnableAdapter |
| { |
| @Override |
| public void run() { |
| SWTListChangeListenerWrapper.this.forwardEvents(); |
| } |
| } |
| |
| void forwardEvents() { |
| for (ListEvent event : this.events.drain()) { |
| try { |
| this.forwardEvent(event); |
| } catch (RuntimeException ex) { |
| JptCommonUiPlugin.instance().logError(ex); |
| } |
| } |
| } |
| |
| private void forwardEvent(ListEvent event) { |
| if (event instanceof ListAddEvent) { |
| this.listener.itemsAdded((ListAddEvent) event); |
| } |
| else if (event instanceof ListRemoveEvent) { |
| this.listener.itemsRemoved((ListRemoveEvent) event); |
| } |
| else if (event instanceof ListMoveEvent) { |
| this.listener.itemsMoved((ListMoveEvent) event); |
| } |
| else if (event instanceof ListReplaceEvent) { |
| this.listener.itemsReplaced((ListReplaceEvent) event); |
| } |
| else if (event instanceof ListClearEvent) { |
| this.listener.listCleared((ListClearEvent) event); |
| } |
| else if (event instanceof ListChangeEvent) { |
| this.listener.listChanged((ListChangeEvent) event); |
| } |
| } |
| |
| /** |
| * {@link DisplayTools#execute(Runnable)} seems to work OK; |
| * but using {@link DisplayTools#syncExec(Runnable)} can somtimes make things |
| * more predictable when debugging, at the risk of deadlocks. |
| */ |
| private void execute(Runnable r) { |
| DisplayTools.execute(r); |
| // SWTUtil.syncExec(r); |
| } |
| |
| @Override |
| public String toString() { |
| return "SWT(" + this.listener + ')'; //$NON-NLS-1$ |
| } |
| } |