blob: d5647eae9a4c635db25c0752696fc9cd26f8dfda [file] [log] [blame]
/**
* @license
* Copyright (C) 2019 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
(function(window) {
'use strict';
// Prevent redefinition.
if (window.GrStylesApi) { return; }
let styleObjectCount = 0;
function GrStyleObject(rulesStr) {
this._rulesStr = rulesStr;
this._className = `__pg_js_api_class_${styleObjectCount}`;
styleObjectCount++;
}
/**
* Creates a new unique CSS class and injects it in a root node of the element
* if it hasn't been added yet. A root node is an document or is the
* associated shadowRoot. This class can be added to any element with the same
* root node.
*
* @param {HTMLElement} element The element to get class name for.
* @return {string} Appropriate class name for the element is returned
*/
GrStyleObject.prototype.getClassName = function(element) {
let rootNode = Polymer.Settings.useShadow
? element.getRootNode() : document.body;
if (rootNode === document) {
rootNode = document.head;
}
if (!rootNode.__pg_js_api_style_tags) {
rootNode.__pg_js_api_style_tags = {};
}
if (!rootNode.__pg_js_api_style_tags[this._className]) {
const styleTag = document.createElement('style');
styleTag.innerHTML = `.${this._className} { ${this._rulesStr} }`;
rootNode.appendChild(styleTag);
rootNode.__pg_js_api_style_tags[this._className] = true;
}
return this._className;
};
/**
* Apply shared style to the element.
*
* @param {HTMLElement} element The element to apply style for
*/
GrStyleObject.prototype.apply = function(element) {
element.classList.add(this.getClassName(element));
};
function GrStylesApi() {
}
/**
* Creates a new GrStyleObject with specified style properties.
*
* @param {string} String with style properties.
* @return {GrStyleObject}
*/
GrStylesApi.prototype.css = function(ruleStr) {
return new GrStyleObject(ruleStr);
};
window.GrStylesApi = GrStylesApi;
})(window);