_changeObjectsEventedState(evented = true) {
    const canvas = this.getCanvas();

    canvas.forEachObject((obj) => {
      // {@link http://fabricjs.com/docs/fabric.Object.html#evented}
      obj.evented = evented;
    });
  }
Change objects 'evented' state
@param {boolean} [evented=true] - objects 'evented' state