function IDragSource()
{this.onDragStart=new REvent();this.onDragMove=new REvent();this.onDragEnd=new REvent();}
function IDropTarget()
{this.onDragOver=new REvent();this.onDragOut=new REvent();this.onDrop=new REvent();}
function DragMonitor()
{this.mouseX;this.mouseY;this.dragSource=null;this.dropTarget=null;this.dragNode=null;var documentProperties=DocumentProperties.statics.getInstance();documentProperties.onMouseMove.addEventListener(new REventListener(this.onMouseMove,this));documentProperties.onMouseUp.addEventListener(new REventListener(this.onMouseUp,this));}
DragMonitor.statics=new Object();DragMonitor.statics.getInstance=function()
{if(!DragMonitor.statics.instance)
DragMonitor.statics.instance=new DragMonitor();return DragMonitor.statics.instance;}
DragMonitor.prototype.setDragSource=function(source,object)
{this.dragSource=source;this.dragObject=object;this.dragStart=false;}
DragMonitor.prototype.setDropTarget=function(target,object)
{if(object.Disabled==1)
return false;this.dropTarget=target;this.dropObject=object;return true;}
DragMonitor.prototype.removeDragSource=function()
{this.dragSource=null;this.dragObject=null;this.dragStart=false;}
DragMonitor.prototype.removeDropTarget=function()
{if(!this.dropping)
{this.dropTarget=null;this.dropObject=null;}}
DragMonitor.prototype.getDragObject=function()
{return this.dragObject;}
DragMonitor.prototype.onMouseMove=function(x,y)
{this.mouseX=x;this.mouseY=y;if(this.dragSource!=null)
{if(!this.dragStart)
{this.dragNode=document.createElement("div");this.dragNode.style.position="absolute";document.getElementsByTagName("body")[0].appendChild(this.dragNode);this.dragSource.onDragStart.trigger(this.dragObject,this.dragNode,x,y);this.dragStart=true;}
this.dragNode.style.left=(x+1)+"px";this.dragNode.style.top=(y+1)+"px";this.dragSource.onDragMove.trigger(this.dragObject,this.dragNode,x,y);}}
DragMonitor.prototype.onMouseUp=function()
{if(this.dropTarget!=null)
{this.dropping=true;if(this.dragSource)
this.dropTarget.onDrop.trigger(this.dragObject,this.dropObject);this.dropTarget.onDragOut.trigger(this.dragObject,this.dropObject);this.dropTarget=null;this.dropObject=null;this.dropping=false;}
if(this.dragSource!=null)
{this.dragSource.onDragEnd.trigger(this.dragObject,this.dragNode,this.mouseX,this.mouseY);this.dragSource=null;this.dragObject=null;}
if(this.dragNode!=null)
{document.getElementsByTagName("body")[0].removeChild(this.dragNode);this.dragNode=null;}}