mxCellTracker.prototype.mouseDown=function(a,b){};mxCellTracker.prototype.mouseMove=function(a,b){this.isEnabled()&&this.process(b)};mxCellTracker.prototype.mouseUp=function(a,b){};mxCellTracker.prototype.destroy=function(){this.destroyed||(this.destroyed=!0,this.graph.removeMouseListener(this),mxCellMarker.prototype.destroy.apply(this))};