bundles/org.eclipse.rap.jface.databinding/src/org/eclipse/jface/internal/databinding/swt/WidgetListenerUtil.java

/*******************************************************************************
 * Copyright (c) 2009 Matthew Hall and others.
 * 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:
 *     Matthew Hall - initial API and implementation (bug 281723)
 ******************************************************************************/

package org.eclipse.jface.internal.databinding.swt;

import org.eclipse.jface.databinding.swt.SWTObservables;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Widget;

/**
 * @since 1.4
 * 
 */
public class WidgetListenerUtil {
	/**
	 * @param widget
	 * @param event
	 * @param listener
	 */
	public static void asyncAddListener(final Widget widget, final int event,
			final Listener listener) {
		if (widget == null)
			return;
		if (widget.isDisposed())
			return;

		Display display = widget.getDisplay();
		if (display == Display.getCurrent()) {
			widget.addListener(event, listener);
		} else {
			SWTObservables.getRealm(display).exec(new Runnable() {
				public void run() {
					if (!widget.isDisposed())
						widget.addListener(event, listener);
				}
			});
		}
	}

	/**
	 * @param widget
	 * @param event
	 * @param listener
	 */
	public static void asyncRemoveListener(final Widget widget,
			final int event, final Listener listener) {
		if (widget == null)
			return;
		if (widget.isDisposed())
			return;

		Display display = widget.getDisplay();
		if (display == Display.getCurrent()) {
			widget.removeListener(event, listener);
		} else {
			SWTObservables.getRealm(display).exec(new Runnable() {
				public void run() {
					if (!widget.isDisposed())
						widget.removeListener(event, listener);
				}
			});
		}
	}
}