/*
	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);}});}