Undo.js
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Undo.js
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	/*
	Copyright (c) 2004-2009, The Dojo Foundation All Rights Reserved.
	Available via Academic Free License >= 2.1 OR the modified BSD license.
	see: http://dojotoolkit.org/license for details
	*/


	if(!dojo._hasResource["dojox.drawing.manager.Undo"]){
	dojo._hasResource["dojox.drawing.manager.Undo"]=true;
	dojo.provide("dojox.drawing.manager.Undo");
	dojox.drawing.manager.Undo=dojox.drawing.util.oo.declare(function(_1){
	this.keys=_1.keys;
	this.undostack=[];
	this.redostack=[];
	dojo.connect(this.keys,"onKeyDown",this,"onKeyDown");
	},{onKeyDown:function(_2){
	if(!_2.cmmd){
	return;
	}
	if(_2.keyCode==90&&!_2.shift){
	this.undo();
	}else{
	if((_2.keyCode==90&&_2.shift)\|\|_2.keyCode==89){
	this.redo();
	}
	}
	},add:function(_3){
	_3.args=dojo.mixin({},_3.args);
	this.undostack.push(_3);
	},apply:function(_4,_5,_6){
	dojo.hitch(_4,_5)(_6);
	},undo:function(){
	var o=this.undostack.pop();
	if(!o){
	return;
	}
	o.before();
	this.redostack.push(o);
	},redo:function(){
	var o=this.redostack.pop();
	if(!o){
	return;
	}
	if(o.after){
	o.after();
	}else{
	o.before();
	}
	this.undostack.push(o);
	}});
	}