SwipeEvents (jQuery plugin)

gistfile1.coffee

# Credit: Eike Send for the awesome swipe event
# ---------------------------------------------
#
# https://github.com/peachananr/onepage-scroll
$.fn.swipeEvents = ->
  return this.each ->
    startX = startY = undefined
    $this = $(this)

    $this.bind('touchstart', touchstart)

    touchstart = (event) ->
      touches = event.originalEvent.touches
      if touches?.length
        startX = touches[0].pageX
        startY = touches[0].pageY
        $this.bind('touchmove', touchmove)

    touchmove = (event) ->
      touches = event.originalEvent.touches
      if touches?.length
        deltaX = startX - touches[0].pageX
        deltaY = startY - touches[0].pageY

        if deltaX >= 50
          $this.trigger("swipeLeft")
        if deltaX <= -50
          $this.trigger("swipeRight")
        if deltaY >= 50
          $this.trigger("swipeUp")
        if deltaY <= -50
          $this.trigger("swipeDown")
        if Math.abs(deltaX) >= 50 || Math.abs(deltaY) >= 50
          $this.unbind('touchmove', touchmove)