_shapeAction() {
    return extend(
      {
        changeShape: (changeShapeObject, isSilent) => {
          if (this.activeObjectId) {
            this.changeShape(this.activeObjectId, changeShapeObject, isSilent);
          }
        },
        setDrawingShape: (shapeType) => {
          this.setDrawingShape(shapeType);
        },
      },
      this._commonAction()
    );
  }
Shape Action
@returns {Object} actions for ui shape
@private