55 lines
1.2 KiB
CoffeeScript
55 lines
1.2 KiB
CoffeeScript
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# Adapted from https://gist.github.com/paulirish/1579671#gistcomment-91515
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raf = window.requestAnimationFrame
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caf = window.cancelAnimationFrame
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w = window
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for vendor in ['ms', 'moz', 'webkit', 'o']
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break if raf
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raf = w["#{vendor}RequestAnimationFrame"]
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caf = (
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w["#{vendor}CancelAnimationFrame"] or
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w["#{vendor}CancelRequestAnimationFrame"]
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)
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# rAF is built in but cAF is not.
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if raf and not caf
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browserRaf = raf
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canceled = {}
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raf = (fn) -> id = browserRaf (time) ->
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return fn time unless id of canceled
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delete canceled[id]
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caf = (id) -> canceled[id] = true
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# Handle legacy browsers which don’t implement rAF
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unless raf
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targetTime = 0
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raf = (fn) ->
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targetTime = Math.max targetTime + 16, currentTime = +new Date
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w.setTimeout (-> fn +new Date), targetTime - currentTime
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caf = (id) -> clearTimeout id
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export requestAnimationFrame = raf
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export cancelAnimationFrame = caf
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# setInterval, but for animations. :)
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said = 1
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handles = {}
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export setAnimation = (fn) ->
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id = said++
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handles[id] = raf ifn = do (id) -> (time) ->
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return unless handles[id]?
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fn time
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handles[id] = raf ifn
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return id
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export clearAnimation = (id) ->
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caf handles[id]
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delete handles[id]
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