EnterFrame(setTimeout) Observer

EnterFrameObserver.coffee

efo = EnterFrameObserver = window.EnterFrameObserver = (fps)->
  @fps = fps
  @listeners = {}
  @listenerNum = 0
  @ticker = null
  @isRunning = false

EnterFrameObserver.prototype.add = (listener)->
  if efo.isRunning
    return
  efo.listeners[listener] = listener
  efo.listenerNum++
  null


EnterFrameObserver.prototype.remove = (listener)->
  if efo.isRunning
    return
      
  delete EnterFrameObserver.listeners[listener]
  @listenerNum--
  null

EnterFrameObserver.prototype.start = (fps=60)->
  efo.ticker = setTimeout(efo.update, efo.fps)
  efo.isRunning = true
  null

EnterFrameObserver.prototype.stop = ()->
  clearTimeout(@ticker)
  @isRunning = false
  null

EnterFrameObserver.prototype.update = ()->
  efo.listeners[listener]() for listener of efo.listeners
  efo.ticker = setTimeout(efo.update,efo.fps)
  null

EnterFrameObserver.init = ()->
  efo = EnterFrameObserver = window.EnterFrameObserver = new EnterFrameObserver(60)

AS で普段使ってる EnterFrameObserver をざっくり移植しただけなので名前の通りになってない部分とかは割愛ｗ