scrollHandleDidStart (index) {
    this._scrollHandleIndex = index
    this._scrollHandleStartPosition = this._scrollPosition
    this._scrollHandleStartTime = new Date().getTime()

    window.requestAnimationFrame(this.scrollHandleDidScroll.bind(this))
  }
/**
   * Triggered when scroll handle scroll starts.
   * @param {Number} index
   */
Triggered when scroll handle scroll starts.
@param {Number} index
Triggered when scroll handle scroll starts . @param { Number } index
scrollHandleDidStart (index) {
    this._scrollHandleIndex = index
    this._scrollHandleStartPosition = this._scrollPosition
    this._scrollHandleStartTime = new Date().getTime()
    window.requestAnimationFrame(this.scrollHandleDidScroll.bind(this))
  }
scrollHandleDidStart ( index ) { this . _scrollHandleIndex = index this . _scrollHandleStartPosition = this . _scrollPosition this . _scrollHandleStartTime = new Date ( ) . getTime ( ) window . requestAnimationFrame ( this . scrollHandleDidScroll . bind ( this ) ) }
Triggered when scroll handle scroll starts.
Triggered when scroll handle scroll starts .