Math.abs(c.y)?c.y=0:c.x=0);this.checkPreview();if(this.currentDx!=c.x||this.currentDy!=c.y)this.currentDx=c.x,this.currentDy=c.y,this.updatePreview()}this.updateHint(b);this.consumeMouseEvent(mxEvent.MOUSE_MOVE,b);mxEvent.consume(b.getEvent())}};mxGraphHandler.prototype.isConstrainedEvent=function(a){return(null==this.target||this.graph.isCloneEvent(a.getEvent()))&&this.graph.isConstrainedEvent(a.getEvent())};