Bacon.Plugins/scheduleAnimFrame.coffee at master · wolfflow/Bacon.Plugins · GitHub

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init = (Bacon) ->
  cancelRequestAnimFrame = do ->
    window.cancelAnimationFrame or
    window.webkitCancelRequestAnimationFrame or
    window.mozCancelRequestAnimationFrame or
    window.oCancelRequestAnimationFrame or
    window.msCancelRequestAnimationFrame or
    clearTimeout

  requestAnimFrame = do ->
    window.requestAnimationFrame or
    window.webkitRequestAnimationFrame or
    window.mozRequestAnimationFrame or
    window.oRequestAnimationFrame or
    window.msRequestAnimationFrame or
    (cb) -> setTimeout(cb, 1000 / 60)


  scheduleFrame = (cb) ->
    id = -1
    animLoop = (x) ->
      cb(x)
      id = requestAnimFrame(-> animLoop(id))

    animLoop(id)

  Bacon.scheduleAnimFrame = ->
    Bacon.fromBinder (handler) ->
      id = scheduleFrame(handler)
      ->  cancelRequestAnimFrame(id)


  Bacon.repeatedlyOnFrame = (values, divisor = 1) ->
    index = 0
    Bacon.scheduleAnimFrame()
    .scan(0, (x) -> x + 1)
    .filter((tick) -> !(tick % divisor))
    .map(-> values[index++ % values.length])
    .toEventStream()

if module?
  Bacon = require("baconjs")
  module.exports = init(Bacon)
else
  if typeof define == "function" and define.amd
    define ["bacon"], init
  else
    init(this.Bacon)