From e44a7e37b6c7b5961adaffc62b9042b8d442938e Mon Sep 17 00:00:00 2001
From: mensonge <mensonge@b3834d28-1941-0410-a4f8-b48e95affb8f>
Date: Thu, 13 Nov 2008 09:49:11 +0000
Subject: New feature: basic Ajax suggestion for tags and implementation of
 Dojo toolkit

git-svn-id: https://semanticscuttle.svn.sourceforge.net/svnroot/semanticscuttle/trunk@151 b3834d28-1941-0410-a4f8-b48e95affb8f
---
 includes/js/dojox/sketch/UndoStack.js | 104 ++++++++++++++++++++++++++++++++++
 1 file changed, 104 insertions(+)
 create mode 100644 includes/js/dojox/sketch/UndoStack.js

(limited to 'includes/js/dojox/sketch/UndoStack.js')

diff --git a/includes/js/dojox/sketch/UndoStack.js b/includes/js/dojox/sketch/UndoStack.js
new file mode 100644
index 0000000..e711557
--- /dev/null
+++ b/includes/js/dojox/sketch/UndoStack.js
@@ -0,0 +1,104 @@
+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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