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comparison dwtx/draw2d/ChangeListener.d @ 98:95307ad235d9

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Added Draw2d code, still work in progress
author Frank Benoit <benoit@tionex.de>
date Sun, 03 Aug 2008 00:52:14 +0200
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96:b492ba44e44d 98:95307ad235d9
1 /*******************************************************************************
2 * Copyright (c) 2000, 2005 IBM Corporation and others.
3 * All rights reserved. This program and the accompanying materials
4 * are made available under the terms of the Eclipse Public License v1.0
5 * which accompanies this distribution, and is available at
6 * http://www.eclipse.org/legal/epl-v10.html
7 *
8 * Contributors:
9 * IBM Corporation - initial API and implementation
10 * Port to the D programming language:
11 * Frank Benoit <benoit@tionex.de>
12 *******************************************************************************/
13 module dwtx.draw2d.ChangeListener;
14
15 import dwt.dwthelper.utils;
16 import dwtx.draw2d.ChangeEvent;
17 import tango.core.Traits;
18 import tango.core.Tuple;
19
20 /**
21 * A generic state listener
22 */
23 public interface ChangeListener {
24
25 /**
26 * Called when the listened to object's state has changed.
27 * @param event the ChangeEvent
28 */
29 void handleStateChanged(ChangeEvent event);
30
31 }
32
33 // DWT Helper
34 private class _DgChangeListenerT(Dg,T...) : ChangeListener {
35
36 alias ParameterTupleOf!(Dg) DgArgs;
37 static assert( is(DgArgs == Tuple!(ChangeEvent,T)),
38 "Delegate args not correct" );
39
40 Dg dg;
41 T t;
42
43 private this( Dg dg, T t ){
44 this.dg = dg;
45 static if( T.length > 0 ){
46 this.t = t;
47 }
48 }
49
50 void handleStateChanged( ChangeEvent e ){
51 dg(e,t);
52 }
53 }
54
55 ChangeListener dgChangeListener( Dg, T... )( Dg dg, T args ){
56 return new _DgChangeListenerT!( Dg, T )( dg, args );
57 }