| /******************************************************************************* |
| * Copyright (c) 2007, 2009 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.ui.internal.listeners; |
| |
| import org.eclipse.jpt.utility.model.event.TreeAddEvent; |
| import org.eclipse.jpt.utility.model.event.TreeChangeEvent; |
| import org.eclipse.jpt.utility.model.event.TreeClearEvent; |
| import org.eclipse.jpt.utility.model.event.TreeRemoveEvent; |
| import org.eclipse.jpt.utility.model.listener.TreeChangeListener; |
| import org.eclipse.swt.widgets.Display; |
| |
| /** |
| * Wrap another tree change listener and forward events to it on the SWT |
| * UI thread. |
| * Forward *every* event asynchronously via the UI thread so the listener |
| * receives in the same order they were generated. |
| */ |
| public class SWTTreeChangeListenerWrapper |
| implements TreeChangeListener |
| { |
| private final TreeChangeListener listener; |
| |
| public SWTTreeChangeListenerWrapper(TreeChangeListener listener) { |
| super(); |
| if (listener == null) { |
| throw new NullPointerException(); |
| } |
| this.listener = listener; |
| } |
| |
| public void nodeAdded(TreeAddEvent event) { |
| this.executeOnUIThread(this.buildNodeAddedRunnable(event)); |
| } |
| |
| public void nodeRemoved(TreeRemoveEvent event) { |
| this.executeOnUIThread(this.buildNodeRemovedRunnable(event)); |
| } |
| |
| public void treeCleared(TreeClearEvent event) { |
| this.executeOnUIThread(this.buildTreeClearedRunnable(event)); |
| } |
| |
| public void treeChanged(TreeChangeEvent event) { |
| this.executeOnUIThread(this.buildTreeChangedRunnable(event)); |
| } |
| |
| private Runnable buildNodeAddedRunnable(final TreeAddEvent event) { |
| return new Runnable() { |
| public void run() { |
| SWTTreeChangeListenerWrapper.this.nodeAdded_(event); |
| } |
| @Override |
| public String toString() { |
| return "node added"; //$NON-NLS-1$ |
| } |
| }; |
| } |
| |
| private Runnable buildNodeRemovedRunnable(final TreeRemoveEvent event) { |
| return new Runnable() { |
| public void run() { |
| SWTTreeChangeListenerWrapper.this.nodeRemoved_(event); |
| } |
| @Override |
| public String toString() { |
| return "node removed"; //$NON-NLS-1$ |
| } |
| }; |
| } |
| |
| private Runnable buildTreeClearedRunnable(final TreeClearEvent event) { |
| return new Runnable() { |
| public void run() { |
| SWTTreeChangeListenerWrapper.this.treeCleared_(event); |
| } |
| @Override |
| public String toString() { |
| return "tree cleared"; //$NON-NLS-1$ |
| } |
| }; |
| } |
| |
| private Runnable buildTreeChangedRunnable(final TreeChangeEvent event) { |
| return new Runnable() { |
| public void run() { |
| SWTTreeChangeListenerWrapper.this.treeChanged_(event); |
| } |
| @Override |
| public String toString() { |
| return "tree changed"; //$NON-NLS-1$ |
| } |
| }; |
| } |
| |
| /** |
| * Display#asyncExec(Runnable) seems to work OK; |
| * but using #syncExec(Runnable) can somtimes make things |
| * more predictable when debugging, at the risk of deadlocks. |
| */ |
| private void executeOnUIThread(Runnable r) { |
| Display.getDefault().asyncExec(r); |
| // Display.getDefault().syncExec(r); |
| } |
| |
| void nodeAdded_(TreeAddEvent event) { |
| this.listener.nodeAdded(event); |
| } |
| |
| void nodeRemoved_(TreeRemoveEvent event) { |
| this.listener.nodeRemoved(event); |
| } |
| |
| void treeCleared_(TreeClearEvent event) { |
| this.listener.treeCleared(event); |
| } |
| |
| void treeChanged_(TreeChangeEvent event) { |
| this.listener.treeChanged(event); |
| } |
| |
| @Override |
| public String toString() { |
| return "SWT(" + this.listener.toString() + ')'; //$NON-NLS-1$ |
| } |
| |
| } |