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