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/*******************************************************************************
* Copyright (c) 2007, 2008 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.StateChangeEvent;
import org.eclipse.jpt.utility.model.listener.StateChangeListener;
import org.eclipse.swt.widgets.Display;
/**
* Wrap another state change listener and forward events to it on the SWT
* UI thread.
*/
public class SWTStateChangeListenerWrapper
implements StateChangeListener
{
private final StateChangeListener listener;
public SWTStateChangeListenerWrapper(StateChangeListener listener) {
super();
if (listener == null) {
throw new NullPointerException();
}
this.listener = listener;
}
public void stateChanged(StateChangeEvent event) {
if (this.isExecutingUIThread()) {
this.stateChanged_(event);
} else {
this.executeOnUIThread(this.buildRunnable(event));
}
}
private Runnable buildRunnable(final StateChangeEvent event) {
return new Runnable() {
public void run() {
SWTStateChangeListenerWrapper.this.stateChanged_(event);
}
};
}
private boolean isExecutingUIThread() {
return Display.getCurrent() != null;
}
/**
* 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 stateChanged_(StateChangeEvent event) {
this.listener.stateChanged(event);
}
@Override
public String toString() {
return "SWT(" + this.listener.toString() + ')'; //$NON-NLS-1$
}
}
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