//>>built
define(["dijit","dojo","dojox"],function(_1,_2,_3){
_2.provide("dojox.drawing.manager.Undo");
_3.drawing.manager.Undo=_3.drawing.util.oo.declare(function(_4){
this.keys=_4.keys;
this.undostack=[];
this.redostack=[];
_2.connect(this.keys,"onKeyDown",this,"onKeyDown");
},{onKeyDown:function(_5){
if(!_5.cmmd){
return;
}
if(_5.keyCode==90&&!_5.shift){
this.undo();
}else{
if((_5.keyCode==90&&_5.shift)||_5.keyCode==89){
this.redo();
}
}
},add:function(_6){
_6.args=_2.mixin({},_6.args);
this.undostack.push(_6);
},apply:function(_7,_8,_9){
_2.hitch(_7,_8)(_9);
},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);
}});
});