74 lines
2.1 KiB
JavaScript
74 lines
2.1 KiB
JavaScript
/* Copyright 2015 Mozilla Foundation
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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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/* globals PDFJS */
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'use strict';
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/**
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* Optimised CSS custom property getter/setter.
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* @class
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*/
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var CustomStyle = (function CustomStyleClosure() {
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// As noted on: http://www.zachstronaut.com/posts/2009/02/17/
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// animate-css-transforms-firefox-webkit.html
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// in some versions of IE9 it is critical that ms appear in this list
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// before Moz
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var prefixes = ['ms', 'Moz', 'Webkit', 'O'];
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var _cache = {};
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function CustomStyle() {}
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CustomStyle.getProp = function get(propName, element) {
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// check cache only when no element is given
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if (arguments.length === 1 && typeof _cache[propName] === 'string') {
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return _cache[propName];
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}
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element = element || document.documentElement;
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var style = element.style, prefixed, uPropName;
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// test standard property first
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if (typeof style[propName] === 'string') {
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return (_cache[propName] = propName);
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}
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// capitalize
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uPropName = propName.charAt(0).toUpperCase() + propName.slice(1);
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// test vendor specific properties
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for (var i = 0, l = prefixes.length; i < l; i++) {
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prefixed = prefixes[i] + uPropName;
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if (typeof style[prefixed] === 'string') {
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return (_cache[propName] = prefixed);
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}
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}
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//if all fails then set to undefined
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return (_cache[propName] = 'undefined');
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};
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CustomStyle.setProp = function set(propName, element, str) {
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var prop = this.getProp(propName);
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if (prop !== 'undefined') {
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element.style[prop] = str;
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}
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};
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return CustomStyle;
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})();
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PDFJS.CustomStyle = CustomStyle;
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