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| 1 | +// Copyright 2014 Google Inc. All rights reserved. |
| 2 | +// |
| 3 | +// Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 | +// you may not use this file except in compliance with the License. |
| 5 | +// You may obtain a copy of the License at |
| 6 | +// |
| 7 | +// http://www.apache.org/licenses/LICENSE-2.0 |
| 8 | +// |
| 9 | +// Unless required by applicable law or agreed to in writing, software |
| 10 | +// distributed under the License is distributed on an "AS IS" BASIS, |
| 11 | +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 12 | +// See the License for the specific language governing permissions and |
| 13 | +// limitations under the License. |
| 14 | + |
| 15 | +(function(scope, testing) { |
| 16 | + |
| 17 | + var styleAttributes = { |
| 18 | + cssText: 1, |
| 19 | + length: 1, |
| 20 | + parentRule: 1, |
| 21 | + }; |
| 22 | + |
| 23 | + var styleMethods = { |
| 24 | + getPropertyCSSValue: 1, |
| 25 | + getPropertyPriority: 1, |
| 26 | + getPropertyValue: 1, |
| 27 | + item: 1, |
| 28 | + removeProperty: 1, |
| 29 | + setProperty: 1, |
| 30 | + }; |
| 31 | + |
| 32 | + var styleMutatingMethods = { |
| 33 | + removeProperty: 1, |
| 34 | + setProperty: 1, |
| 35 | + }; |
| 36 | + |
| 37 | + function configureProperty(object, property, descriptor) { |
| 38 | + descriptor.enumerable = true; |
| 39 | + descriptor.configurable = true; |
| 40 | + Object.defineProperty(object, property, descriptor); |
| 41 | + } |
| 42 | + |
| 43 | + function AnimatedCSSStyleDeclaration(element) { |
| 44 | + WEB_ANIMATIONS_TESTING && console.assert(!(element.style instanceof AnimatedCSSStyleDeclaration), |
| 45 | + 'Element must not already have an animated style attached.'); |
| 46 | + |
| 47 | + // Stores the inline style of the element on its behalf while the |
| 48 | + // polyfill uses the element's inline style to simulate web animations. |
| 49 | + // This is needed to fake regular inline style CSSOM access on the element. |
| 50 | + this._surrogateElement = document.createElement('div'); |
| 51 | + this._surrogateStyle = this._surrogateElement.style; |
| 52 | + this._style = element.style; |
| 53 | + this._length = 0; |
| 54 | + this._isAnimatedProperty = {}; |
| 55 | + |
| 56 | + // Copy the inline style contents over to the surrogate. |
| 57 | + for (var i = 0; i < this._style.length; i++) { |
| 58 | + var property = this._style[i]; |
| 59 | + this._surrogateStyle[property] = this._style[property]; |
| 60 | + } |
| 61 | + this._updateIndices(); |
| 62 | + } |
| 63 | + |
| 64 | + AnimatedCSSStyleDeclaration.prototype = { |
| 65 | + get cssText() { |
| 66 | + return this._surrogateStyle.cssText; |
| 67 | + }, |
| 68 | + set cssText(text) { |
| 69 | + var isAffectedProperty = {}; |
| 70 | + for (var i = 0; i < this._surrogateStyle.length; i++) { |
| 71 | + isAffectedProperty[this._surrogateStyle[i]] = true; |
| 72 | + } |
| 73 | + this._surrogateStyle.cssText = text; |
| 74 | + this._updateIndices(); |
| 75 | + for (var i = 0; i < this._surrogateStyle.length; i++) { |
| 76 | + isAffectedProperty[this._surrogateStyle[i]] = true; |
| 77 | + } |
| 78 | + for (var property in isAffectedProperty) { |
| 79 | + if (!this._isAnimatedProperty[property]) { |
| 80 | + this._style.setProperty(property, this._surrogateStyle.getPropertyValue(property)); |
| 81 | + } |
| 82 | + } |
| 83 | + }, |
| 84 | + get length() { |
| 85 | + return this._surrogateStyle.length; |
| 86 | + }, |
| 87 | + get parentRule() { |
| 88 | + return this._style.parentRule; |
| 89 | + }, |
| 90 | + // Mirror the indexed getters and setters of the surrogate style. |
| 91 | + _updateIndices: function() { |
| 92 | + while (this._length < this._surrogateStyle.length) { |
| 93 | + Object.defineProperty(this, this._length, { |
| 94 | + configurable: true, |
| 95 | + enumerable: false, |
| 96 | + get: (function(index) { |
| 97 | + return function() { return this._surrogateStyle[index]; }; |
| 98 | + })(this._length) |
| 99 | + }); |
| 100 | + this._length++; |
| 101 | + } |
| 102 | + while (this._length > this._surrogateStyle.length) { |
| 103 | + this._length--; |
| 104 | + Object.defineProperty(this, this._length, { |
| 105 | + configurable: true, |
| 106 | + enumerable: false, |
| 107 | + value: undefined |
| 108 | + }); |
| 109 | + } |
| 110 | + }, |
| 111 | + _set: function(property, value) { |
| 112 | + this._style[property] = value; |
| 113 | + this._isAnimatedProperty[property] = true; |
| 114 | + }, |
| 115 | + _clear: function(property) { |
| 116 | + this._style[property] = this._surrogateStyle[property]; |
| 117 | + delete this._isAnimatedProperty[property]; |
| 118 | + }, |
| 119 | + }; |
| 120 | + |
| 121 | + // Wrap the style methods. |
| 122 | + for (var method in styleMethods) { |
| 123 | + AnimatedCSSStyleDeclaration.prototype[method] = (function(method, modifiesStyle) { |
| 124 | + return function() { |
| 125 | + var result = this._surrogateStyle[method].apply(this._surrogateStyle, arguments); |
| 126 | + if (modifiesStyle) { |
| 127 | + if (!this._isAnimatedProperty[arguments[0]]) |
| 128 | + this._style[method].apply(this._style, arguments); |
| 129 | + this._updateIndices(); |
| 130 | + } |
| 131 | + return result; |
| 132 | + } |
| 133 | + })(method, method in styleMutatingMethods); |
| 134 | + } |
| 135 | + |
| 136 | + // Wrap the style.cssProperty getters and setters. |
| 137 | + for (var property in document.documentElement.style) { |
| 138 | + if (property in styleAttributes || property in styleMethods) { |
| 139 | + continue; |
| 140 | + } |
| 141 | + (function(property) { |
| 142 | + configureProperty(AnimatedCSSStyleDeclaration.prototype, property, { |
| 143 | + get: function() { |
| 144 | + return this._surrogateStyle[property]; |
| 145 | + }, |
| 146 | + set: function(value) { |
| 147 | + this._surrogateStyle[property] = value; |
| 148 | + this._updateIndices(); |
| 149 | + if (!this._isAnimatedProperty[property]) |
| 150 | + this._style[property] = value; |
| 151 | + } |
| 152 | + }); |
| 153 | + })(property); |
| 154 | + } |
| 155 | + |
| 156 | + function ensureStyleIsPatched(element) { |
| 157 | + if (element._webAnimationsPatchedStyle) |
| 158 | + return; |
| 159 | + |
| 160 | + // If this style patch fails (on Safari and iOS) use the apply-preserving-inline-style-methods.js |
| 161 | + // module instead and restrict inline style interactions to the methods listed in styleMethods. |
| 162 | + var animatedStyle = new AnimatedCSSStyleDeclaration(element); |
| 163 | + configureProperty(element, 'style', { get: function() { return animatedStyle; } }); |
| 164 | + |
| 165 | + // We must keep a handle on the patched style to prevent it from getting GC'd. |
| 166 | + element._webAnimationsPatchedStyle = element.style; |
| 167 | + } |
| 168 | + |
| 169 | + scope.apply = function(element, property, value) { |
| 170 | + ensureStyleIsPatched(element); |
| 171 | + element.style._set(scope.propertyName(property), value); |
| 172 | + }; |
| 173 | + |
| 174 | + scope.clear = function(element, property) { |
| 175 | + if (element._webAnimationsPatchedStyle) { |
| 176 | + element.style._clear(scope.propertyName(property)); |
| 177 | + } |
| 178 | + }; |
| 179 | + |
| 180 | + if (WEB_ANIMATIONS_TESTING) |
| 181 | + testing.ensureStyleIsPatched = ensureStyleIsPatched; |
| 182 | + |
| 183 | +})(webAnimationsMinifill, webAnimationsTesting); |
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