!(function (factory) {
  'function' == typeof define && define.amd
    ? define(['jquery'], factory)
    : 'object' == typeof exports
    ? (module.exports = factory(require('jquery')))
    : factory(jQuery)
})(function ($) {
  var dispatch = $.event.dispatch || $.event.handle,
    special = $.event.special,
    uid1 = 'D' + +new Date(),
    uid2 = 'D' + (+new Date() + 1)
  ;(special.scrollstart = {
    setup: function (data) {
      var timer,
        _data = $.extend({ latency: special.scrollstop.latency }, data),
        handler = function (evt) {
          var _self = this,
            _args = arguments
          timer ? clearTimeout(timer) : ((evt.type = 'scrollstart'), dispatch.apply(_self, _args)),
            (timer = setTimeout(function () {
              timer = null
            }, _data.latency))
        }
      $(this).bind('scroll', handler).data(uid1, handler)
    },
    teardown: function () {
      $(this).unbind('scroll', $(this).data(uid1))
    },
  }),
    (special.scrollstop = {
      latency: 250,
      setup: function (data) {
        var timer,
          _data = $.extend({ latency: special.scrollstop.latency }, data),
          handler = function (evt) {
            var _self = this,
              _args = arguments
            timer && clearTimeout(timer),
              (timer = setTimeout(function () {
                ;(timer = null), (evt.type = 'scrollstop'), dispatch.apply(_self, _args)
              }, _data.latency))
          }
        $(this).bind('scroll', handler).data(uid2, handler)
      },
      teardown: function () {
        $(this).unbind('scroll', $(this).data(uid2))
      },
    })
})