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draw2d.MyCanvas=function(id){
        draw2d.Workflow.call(this,id);
        this.html.style.backgroundImage="";//remove default backgourd
        this.html.className="MyCanvas";
        this.disabled=false;
        //this.processCategory=null;
        this.processId=null;
        this.processName=null;
        this.process=new draw2d.Process();
        //this.listeners=new draw2d.ArrayList();
};
draw2d.MyCanvas.prototype = new draw2d.Workflow();
draw2d.MyCanvas.prototype.type = "MyCanvas";
/*
draw2d.MyCanvas.prototype.showConnectionLine=function(x1, y1, x2, y2){
    var connectionLine = new draw2d.DecoratedConnection();
    connectionLine.setStartPoint(x1, y1);
    connectionLine.setEndPoint(x2, y2);
    if (connectionLine.canvas === null) {
        draw2d.Canvas.prototype.addFigure.call(this, connectionLine);
    }
};
*/
draw2d.MyCanvas.prototype.setDisabled = function(){
    this.disabled = true;
    return this.readOnly;
};
draw2d.MyCanvas.prototype.addFigure = function(figure, xPos, yPos){
    var parent = this.getBestCompartmentFigure(xPos,yPos);
    if(parent === null){
        draw2d.Workflow.prototype.addFigure.call(this,figure, xPos, yPos);
    }else{
        this.getCommandStack().execute(new draw2d.CommandAdd(this,figure,xPos,yPos,parent));
    }
};
draw2d.MyCanvas.prototype.addModel = function(figure, xPos, yPos){
    var parent = this.getBestCompartmentFigure(xPos,yPos);
    this.getCommandStack().execute(new draw2d.CommandAdd(this,figure,xPos,yPos,parent));
};
draw2d.MyCanvas.prototype.getContextMenu=function(){
    if(this.readOnly)return null;
    var menu =new draw2d.ContextMenu(100, 50);
    var data = {workflow:this};
    menu.appendMenuItem(new draw2d.ContextMenuItem("Properties", "properties-icon",data,function(x,y)
    {
        var data = this.getData();
        var workflow = data.workflow;
        var pid = workflow.process.id;
        openProcessProperties(pid);
    }));
    return menu;
    
};
 
draw2d.MyCanvas.prototype.getListener=function(id){
    for(var i=0;i<this.listeners.getSize();i++){
        var listener = this.listeners.get(i);
        if(listener.getId()=== id){
            return listener;
        }
    }
};
draw2d.MyCanvas.prototype.deleteListener=function(id){
    var listener = this.getListener(id);
    this.listeners.remove(listener);
};
draw2d.MyCanvas.prototype.setListener=function(listenser){
    this.listeners.add(listener);
};
 
draw2d.MyCanvas.prototype.onContextMenu=function(x,y){
    if(this.readOnly)return;
    var f = this.getBestFigure(x, y);
    if(f==null)
        f = this.getBestLine(x, y);
    if(f !=null){
        var menu = f.getContextMenu();
        if (menu !== null) {
            this.showMenu(menu, x, y);
        }
    }else{
        var menu = this.getContextMenu();
        if (menu !== null) {
            this.showMenu(menu, x, y);
        }
    }
};
 
 
draw2d.MyCanvas.prototype.getXMLHeader=function(){
    var xml='<?xml version="1.0" encoding="UTF-8"?>\n';
    return xml;
};
draw2d.MyCanvas.prototype.getDefinitionsStartXML=function(){
    var xml = '<definitions xmlns="http://www.omg.org/spec/BPMN/20100524/MODEL" '
        +'xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" '
        +'xmlns:activiti="http://activiti.org/bpmn" '
        +'xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI" '
        +'xmlns:omgdc="http://www.omg.org/spec/DD/20100524/DC" '
        +'xmlns:omgdi="http://www.omg.org/spec/DD/20100524/DI" '
        +'typeLanguage="http://www.w3.org/2001/XMLSchema" '
        +'expressionLanguage="http://www.w3.org/1999/XPath" '
        +'targetNamespace="'+this.process.category+'">\n';
    return xml;
};
draw2d.MyCanvas.prototype.getDefinitionsEndXML=function(){
    var xml='</definitions>\n';
    return xml;
};
 
draw2d.MyCanvas.prototype.toXML=function(){
    var xml = this.getXMLHeader();
    xml = xml+this.getDefinitionsStartXML();
    xml=xml+'<process id="'+this.process.id+'" name="'+this.process.name+'">\n';
    xml=xml+this.process.getDocumentationXML();
    xml=xml+this.process.getExtensionElementsXML();
    var bpmnDigramXml='<bpmndi:BPMNDiagram id="BPMNDiagram_'+this.process.id+'">\n';
    bpmnDigramXml=bpmnDigramXml+'<bpmndi:BPMNPlane bpmnElement="'+this.process.id+'" id="BPMNPlane_'+this.process.id+'">\n';
    
    var models = this.getFigures();
    //alert(models.getSize()+"####"); 
    for(var i=0;i<models.getSize();i++){
        var model=models.get(i);
        for(var j=0;j<DefaultModelTypeEnum.length;j++){
            if(DefaultModelTypeEnum[j]==model.type){
                //alert(model.type);
            //    alert(model.toXML());
                xml=xml+model.toXML();
                bpmnDigramXml=bpmnDigramXml+model.toBpmnDI();
                break;
            }
        }
    } 
    var lines = this.getLines();
 
    for(var i=0;i<lines.getSize();i++){
        var line = lines.get(i);
        for(var j=0;j<DefaultModelTypeEnum.length;j++){
            if(DefaultModelTypeEnum[j]==line.type){
                //alert(line.type);
                xml=xml+line.toXML();
                bpmnDigramXml=bpmnDigramXml+line.toBpmnDI();
                break;
            }
        }
    }
    xml=xml+'</process>\n';
    bpmnDigramXml=bpmnDigramXml+'</bpmndi:BPMNPlane>\n'
    bpmnDigramXml=bpmnDigramXml+'</bpmndi:BPMNDiagram>\n';
    xml=xml+bpmnDigramXml;
    xml=xml+this.getDefinitionsEndXML();
    xml=formatXml(xml);
    return xml;
};