1 files changed, 106 insertions, 0 deletions
diff --git a/js/dojo/dojox/sketch/UndoStack.js b/js/dojo/dojox/sketch/UndoStack.js
new file mode 100644
index 0000000..5b8643c
--- /dev/null
+++ b/js/dojo/dojox/sketch/UndoStack.js
@@ -0,0 +1,106 @@
+//>>built
+define("dojox/sketch/UndoStack", [
+	"dojo/_base/kernel",
+	"dojo/_base/lang",
+	"dojo/_base/declare",
+	"../xml/DomParser"
+], function(dojo){
+	dojo.getObject("sketch", true, dojox);
+	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.getAnnotator(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.getAnnotator(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);
+			}
+		}
+	});
+
+	return dojox.sketch.UndoStack;
+});