36 lines
797 B
JavaScript
36 lines
797 B
JavaScript
var FRAME_BUDGET = 16 // 60 frames per second = 1 call per 16 ms
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module.exports = function($window, render) {
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var rAF = $window.requestAnimationFrame || $window.setTimeout
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var cAF = $window.cancelAnimationFrame || $window.clearTimeout
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var last = 0
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var pending = null
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return function(force) {
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var now = new Date()
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// Immediately render if:
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// Forced
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// Haven't rendered yet
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// Time since the last render is greater than the frame budget
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if(force || !last || now - last > FRAME_BUDGET) {
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last = now;
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return render()
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}
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// Redraw already pending, abort
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if(pending !== null) {
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return
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}
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// Schedule a redraw for the next tick
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pending = rAF(function() {
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render()
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last = new Date()
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pending = null
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}, FRAME_BUDGET - (now - last))
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}
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}
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