40 lines
1.0 KiB
JavaScript
40 lines
1.0 KiB
JavaScript
var now = require('./now');
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var isBrowser = require('./isBrowser');
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var raf, cancel;
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var lastTime = 0;
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if (isBrowser) {
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raf = window.requestAnimationFrame;
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cancel = window.cancelAnimationFrame;
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var vendors = ['ms', 'moz', 'webkit', 'o'];
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for (var i = 0, len = vendors.length; i < len && !raf; i++) {
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raf = window[vendors[i] + 'RequestAnimationFrame'];
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cancel =
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window[vendors[i] + 'CancelAnimationFrame'] ||
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window[vendors[i] + 'CancelRequestAnimationFrame'];
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}
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if (raf) {
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raf = raf.bind(window);
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cancel = cancel.bind(window);
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}
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}
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raf =
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raf ||
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function(cb) {
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var curTime = now();
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var timeToCall = Math.max(0, 16 - (curTime - lastTime));
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var id = setTimeout(function() {
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cb(curTime + timeToCall);
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}, timeToCall);
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lastTime = curTime + timeToCall;
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return id;
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};
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cancel =
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cancel ||
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function(id) {
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clearTimeout(id);
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};
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raf.cancel = cancel;
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exports = raf;
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module.exports = exports;
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