handleDragEvent(mapBrowserEvent) {
    if (!this.startPixel_) {
      return;
    }

    this.box_.setPixels(this.startPixel_, mapBrowserEvent.pixel);

    this.dispatchEvent(
      new DragBoxEvent(
        DragBoxEventType.BOXDRAG,
        mapBrowserEvent.coordinate,
        mapBrowserEvent,
      ),
    );
  }
Handle pointer drag events.
@param {import("../MapBrowserEvent.js").default} mapBrowserEvent Event.
@override