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if(!dojo._hasResource["dojox.sketch.UndoStack"]){ //_hasResource checks added by build. Do not use _hasResource directly in your code.
dojo._hasResource["dojox.sketch.UndoStack"] = true;
dojo.provide("dojox.sketch.UndoStack");
dojo.require("dojox.xml.DomParser");
(function(){
var ta=dojox.sketch;
ta.CommandTypes={ Create:"Create", Move:"Move", Modify:"Modify", Delete:"Delete", Convert:"Convert"};
dojo.declare("dojox.sketch.UndoStack",null,{
constructor: function(figure){
this.figure=figure;
this._steps=[];
this._undoedSteps=[];
},
apply: function(state, from, to){
// the key here is to neutrally move from one state to another.
// we let the individual functions (i.e. undo and redo) actually
// determine the from and to; all we do here is implement it.
// check whether this is a fullText step
if(!from && !to && state.fullText){
this.figure.setValue(state.fullText);
return;
}
var fromText=from.shapeText;
var toText=to.shapeText;
if(fromText.length==0&&toText.length==0){
// nothing to reapply?
return;
}
if(fromText.length==0){
// We are creating.
var o=dojox.xml.DomParser.parse(toText).documentElement;
var a=this.figure._loadAnnotation(o);
if(a) this.figure._add(a);
return;
}
if(toText.length==0){
// we are deleting.
var ann=this.figure.get(from.shapeId);
this.figure._delete([ann],true);
return;
}
// we can simply reinit and draw from the shape itself,
// regardless of the actual command.
var nann=this.figure.get(to.shapeId);
var no=dojox.xml.DomParser.parse(toText).documentElement;
nann.draw(no);
this.figure.select(nann);
return;
},
// stack methods.
add: function(/*String*/cmd, /*ta.Annotation?*/ann, /*String?*/before){
var id=ann?ann.id:'';
//var bbox=ann?ann.getBBox():{};
var after=ann?ann.serialize():"";
if(cmd==ta.CommandTypes.Delete) after="";
/*if(ann){
// fix the bbox x/y coords
var t=ann.transform;
bbox.x+=t.dx;
bbox.y+=t.dy;
}*/
var state={
cmdname:cmd,
//bbox:bbox,
// fullText:fullText,
before:{
shapeId: id,
shapeText:before||''
},
after:{
shapeId: id,
shapeText:after
}
};
//console.log('dojox.sketch history add',state);
this._steps.push(state);
this._undoedSteps = [];
},
destroy: function(){},
undo: function(){
var state=this._steps.pop();
if(state){
this._undoedSteps.push(state);
this.apply(state,state.after,state.before);
}
},
redo: function(){
var state=this._undoedSteps.pop();
if(state){
this._steps.push(state);
this.apply(state,state.before,state.after);
}
}
});
})();
}
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