Andreas Hocevar
62 lines
2.1 KiB
JavaScript
62 lines
2.1 KiB
JavaScript
// Copyright 2014 The Closure Library Authors. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS-IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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/**
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* @fileoverview A polyfill for window.requestAnimationFrame and
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* window.cancelAnimationFrame.
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* Code based on https://gist.github.com/paulirish/1579671
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*/
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goog.provide('goog.dom.animationFrame.polyfill');
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/**
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* @define {boolean} If true, will install the requestAnimationFrame polyfill.
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*/
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goog.define('goog.dom.animationFrame.polyfill.ENABLED', true);
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/**
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* Installs the requestAnimationFrame (and cancelAnimationFrame) polyfill.
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*/
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goog.dom.animationFrame.polyfill.install =
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goog.dom.animationFrame.polyfill.ENABLED ? function() {
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var vendors = ['ms', 'moz', 'webkit', 'o'];
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for (var x = 0; x < vendors.length && !window.requestAnimationFrame; ++x) {
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window.requestAnimationFrame = window[vendors[x] +
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'RequestAnimationFrame'];
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window.cancelAnimationFrame = window[vendors[x] +
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'CancelAnimationFrame'] ||
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window[vendors[x] + 'CancelRequestAnimationFrame'];
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}
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if (!window.requestAnimationFrame) {
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var lastTime = 0;
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window.requestAnimationFrame = function(callback, element) {
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var currTime = new Date().getTime();
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var timeToCall = Math.max(0, 16 - (currTime - lastTime));
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lastTime = currTime + timeToCall;
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return window.setTimeout(function() {
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callback(currTime + timeToCall);
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}, timeToCall);
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};
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if (!window.cancelAnimationFrame) {
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window.cancelAnimationFrame = function(id) {
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clearTimeout(id);
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};
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}
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}
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} : goog.nullFunction;
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