if(b(this.rotationShape))return mxEvent.ROTATION_HANDLE;if(b(this.labelShape))return mxEvent.LABEL_HANDLE;if(null!=this.sizers)for(var d=0;d<this.sizers.length;d++)if(b(this.sizers[d]))return d;if(null!=this.customHandles&&this.isCustomHandleEvent(a))for(d=this.customHandles.length-1;0<=d;d--)if(b(this.customHandles[d].shape))return mxEvent.CUSTOM_HANDLE-d;return null};mxVertexHandler.prototype.isCustomHandleEvent=function(a){return!0};