code: function(event) {
      this.states.left = false;
      this.states.right = false;
      this.states.front = false;
      this.states.back = false;
  
      event.preventDefault();
      event.stopPropagation();
    }
docs: Fired to reset all key statuses based on no fingers being on the screen.
  @param  {Object} event DOM event data including the position touched.