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/*******************************************************************************
* 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.common.ui.internal.listeners;
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.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;
import org.eclipse.swt.widgets.Display;
/**
* Wrap another list change listener and forward events to it on the SWT
* UI thread, asynchronously if necessary.
*/
public class SWTListChangeListenerWrapper
implements ListChangeListener
{
private final ListChangeListener listener;
public SWTListChangeListenerWrapper(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.executeOnUIThread(this.buildItemsAddedRunnable(event));
}
}
public void itemsRemoved(ListRemoveEvent event) {
if (this.isExecutingOnUIThread()) {
this.itemsRemoved_(event);
} else {
this.executeOnUIThread(this.buildItemsRemovedRunnable(event));
}
}
public void itemsMoved(ListMoveEvent event) {
if (this.isExecutingOnUIThread()) {
this.itemsMoved_(event);
} else {
this.executeOnUIThread(this.buildItemsMovedRunnable(event));
}
}
public void itemsReplaced(ListReplaceEvent event) {
if (this.isExecutingOnUIThread()) {
this.itemsReplaced_(event);
} else {
this.executeOnUIThread(this.buildItemsReplacedRunnable(event));
}
}
public void listCleared(ListClearEvent event) {
if (this.isExecutingOnUIThread()) {
this.listCleared_(event);
} else {
this.executeOnUIThread(this.buildListClearedRunnable(event));
}
}
public void listChanged(ListChangeEvent event) {
if (this.isExecutingOnUIThread()) {
this.listChanged_(event);
} else {
this.executeOnUIThread(this.buildListChangedRunnable(event));
}
}
private Runnable buildItemsAddedRunnable(final ListAddEvent event) {
return new Runnable() {
public void run() {
SWTListChangeListenerWrapper.this.itemsAdded_(event);
}
@Override
public String toString() {
return "items added runnable"; //$NON-NLS-1$
}
};
}
private Runnable buildItemsRemovedRunnable(final ListRemoveEvent event) {
return new Runnable() {
public void run() {
SWTListChangeListenerWrapper.this.itemsRemoved_(event);
}
@Override
public String toString() {
return "items removed runnable"; //$NON-NLS-1$
}
};
}
private Runnable buildItemsMovedRunnable(final ListMoveEvent event) {
return new Runnable() {
public void run() {
SWTListChangeListenerWrapper.this.itemsMoved_(event);
}
@Override
public String toString() {
return "items moved runnable"; //$NON-NLS-1$
}
};
}
private Runnable buildItemsReplacedRunnable(final ListReplaceEvent event) {
return new Runnable() {
public void run() {
SWTListChangeListenerWrapper.this.itemsReplaced_(event);
}
@Override
public String toString() {
return "items replaced runnable"; //$NON-NLS-1$
}
};
}
private Runnable buildListClearedRunnable(final ListClearEvent event) {
return new Runnable() {
public void run() {
SWTListChangeListenerWrapper.this.listCleared_(event);
}
@Override
public String toString() {
return "list cleared runnable"; //$NON-NLS-1$
}
};
}
private Runnable buildListChangedRunnable(final ListChangeEvent event) {
return new Runnable() {
public void run() {
SWTListChangeListenerWrapper.this.listChanged_(event);
}
@Override
public String toString() {
return "list changed runnable"; //$NON-NLS-1$
}
};
}
private boolean isExecutingOnUIThread() {
return Display.getCurrent() != null;
}
/**
* {@link Display#asyncExec(Runnable)} seems to work OK;
* but using {@link Display#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 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 "SWT(" + this.listener.toString() + ')'; //$NON-NLS-1$
}
}
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