--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dwt/widgets/Listener.d	Sat Aug 09 17:00:02 2008 +0200
@@ -0,0 +1,54 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2005 IBM Corporation 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:
+ *     IBM Corporation - initial API and implementation
+ *******************************************************************************/
+module dwt.widgets.Listener;
+
+import dwt.dwthelper.utils;
+
+
+/**
+ * Implementers of <code>Listener</code> provide a simple 
+ * <code>handleEvent()</code> method that is used internally 
+ * by DWT to dispatch events.
+ * <p>
+ * After creating an instance of a class that implements this interface
+ * it can be added to a widget using the 
+ * <code>addListener(int eventType, Listener handler)</code> method and
+ * removed using the 
+ * <code>removeListener (int eventType, Listener handler)</code> method. 
+ * When the specified event occurs, <code>handleEvent(...)</code> will
+ * be sent to the instance.
+ * </p>
+ * <p>
+ * Classes which implement this interface are described within DWT as
+ * providing the <em>untyped listener</em> API. Typically, widgets will
+ * also provide a higher-level <em>typed listener</em> API, that is based
+ * on the standard <code>java.util.EventListener</code> pattern.
+ * </p> 
+ * <p>
+ * Note that, since all internal DWT event dispatching is based on untyped
+ * listeners, it is simple to build subsets of DWT for use on memory 
+ * constrained, small footprint devices, by removing the classes and
+ * methods which implement the typed listener API.
+ * </p>
+ *
+ * @see Widget#addListener
+ * @see java.util.EventListener
+ * @see dwt.events
+ */
+public interface Listener {
+
+/**
+ * Sent when an event that the receiver has registered for occurs.
+ *
+ * @param event the event which occurred
+ */
+void handleEvent (Event event);
+}