dgListener creates a class implementing the Listener interface and delegating the call to handleEvent to the users delegate. This template function will store also additional parameters.
Implementers of <code>Listener</code> provide a simple <code>handleEvent()</code> method that is used internally by SWT 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 SWT 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 SWT event dispatching is based on untyped listeners, it is simple to build subsets of SWT for use on memory constrained, small footprint devices, by removing the classes and methods which implement the typed listener API. </p>
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 Port to the D programming language: Frank Benoit <benoit@tionex.de>