--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/org.eclipse.swt.win32.win32.x86/src/org/eclipse/swt/widgets/Listener.d	Mon Mar 02 14:44:16 2009 +0100
@@ -0,0 +1,100 @@
+/*******************************************************************************
+ * 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>
+ *******************************************************************************/
+module org.eclipse.swt.widgets.Listener;
+
+import org.eclipse.swt.widgets.Event;
+
+import tango.core.Traits;
+import tango.core.Tuple;
+
+/**
+ * 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>
+ *
+ * @see Widget#addListener
+ * @see java.util.EventListener
+ * @see org.eclipse.swt.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);
+}
+
+
+/// Helper class for the dgListener template function
+private class _DgListenerT(Dg,T...) : Listener {
+
+    alias ParameterTupleOf!(Dg) DgArgs;
+    static assert( is(DgArgs == Tuple!(Event,T)),
+                "Delegate args not correct: delegate args: ("~DgArgs.stringof~") vs. passed args: ("~Tuple!(Event,T).stringof~")" );
+
+    Dg dg;
+    T  t;
+
+    private this( Dg dg, T t ){
+        this.dg = dg;
+        static if( T.length > 0 ){
+            this.t = t;
+        }
+    }
+
+    void handleEvent( Event e ){
+        dg(e,t);
+    }
+}
+
+/++
+ + 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.
+ +
+ + Examle of usage:
+ + ---
+ + void handleTextEvent (Event e, int inset ) {
+ +     // ...
+ + }
+ + text.addListener (SWT.FocusOut, dgListener( &handleTextEvent, inset ));
+ + ---
+ +/
+Listener dgListener( Dg, T... )( Dg dg, T args ){
+    return new _DgListenerT!( Dg, T )( dg, args );
+}
+
+
+