null,null,this.mouseUpListener),mxEvent.addListener(document,"mouseleave",this.mouseUpListener))}mxPanningHandler.prototype=new mxEventSource;mxPanningHandler.prototype.constructor=mxPanningHandler;mxPanningHandler.prototype.graph=null;mxPanningHandler.prototype.useLeftButtonForPanning=!1;mxPanningHandler.prototype.usePopupTrigger=!0;mxPanningHandler.prototype.ignoreCell=!1;mxPanningHandler.prototype.previewEnabled=!0;mxPanningHandler.prototype.useGrid=!1;