c.getProperty("event"),mxEvent.isConsumed(b)||"gesturestart"!=b.type?"gestureend"==b.type&&null!=this.initialScale&&(this.initialScale=null):(this.initialScale=this.graph.view.scale,this.active||null==this.mouseDownEvent||(this.start(this.mouseDownEvent),this.mouseDownEvent=null)),null!=this.initialScale&&this.zoomGraph(b))}),this.graph.addListener(mxEvent.GESTURE,this.gestureHandler),this.mouseUpListener=mxUtils.bind(this,function(){this.active&&this.reset()}),mxEvent.addGestureListeners(document,