Function onEvent

test/components/dragBoxLayerTests.ts:28–40

(event: string, callback: (bound: { topLeft: Plottable.Point, bottomRight: Plottable.Point }) => void)

      });

      function onEvent(event: string, callback: (bound: { topLeft: Plottable.Point, bottomRight: Plottable.Point }) => void) {
        switch (event) {
          case "dragStart":
            dbl.onDragStart(callback);
            break;
          case "drag":
            dbl.onDragStart(callback);
            break;
          case "dragEnd":
            dbl.onDragEnd(callback);
            break;
        }
      }

      function offEvent(event: string, callback: (bound: { topLeft: Plottable.Point, bottomRight: Plottable.Point }) => void) {
        switch (event) {