code: function() {
      // Use publish instead of scrollTo to allow scrolling to out of boundary position
      // We don't need to normalize scrollLeft, zoomLevel, etc. here because we only y-scrolling when pull-to-refresh is enabled
      this.__publish(this.__scrollLeft, -this.__refreshHeight, this.__zoomLevel, true);
  
      var d = new Date();
      this.refreshStartTime = d.getTime();
  
      if (this.__refreshStart) {
        this.__refreshStart();
      }
    }
docs: Starts pull-to-refresh manually.