Mercurial > projects > dwt-addons
view dwtx/draw2d/ChangeListener.d @ 101:1082a0fc2bb8
First Draw2D example running
author | Frank Benoit <benoit@tionex.de> |
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date | Sun, 03 Aug 2008 02:17:46 +0200 |
parents | 95307ad235d9 |
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/******************************************************************************* * 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 dwtx.draw2d.ChangeListener; import dwt.dwthelper.utils; import dwtx.draw2d.ChangeEvent; import tango.core.Traits; import tango.core.Tuple; /** * A generic state listener */ public interface ChangeListener { /** * Called when the listened to object's state has changed. * @param event the ChangeEvent */ void handleStateChanged(ChangeEvent event); } // DWT Helper private class _DgChangeListenerT(Dg,T...) : ChangeListener { alias ParameterTupleOf!(Dg) DgArgs; static assert( is(DgArgs == Tuple!(ChangeEvent,T)), "Delegate args not correct" ); Dg dg; T t; private this( Dg dg, T t ){ this.dg = dg; static if( T.length > 0 ){ this.t = t; } } void handleStateChanged( ChangeEvent e ){ dg(e,t); } } ChangeListener dgChangeListener( Dg, T... )( Dg dg, T args ){ return new _DgChangeListenerT!( Dg, T )( dg, args ); }