| /** |
| * @license |
| * Copyright (C) 2017 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. |
| */ |
| import '../../../scripts/bundled-polymer.js'; |
| |
| import '../../shared/gr-js-api-interface/gr-js-api-interface.js'; |
| import {importHref} from '../../../scripts/import-href.js'; |
| import {updateStyles} from '@polymer/polymer/lib/mixins/element-mixin.js'; |
| import {GestureEventListeners} from '@polymer/polymer/lib/mixins/gesture-event-listeners.js'; |
| import {LegacyElementMixin} from '@polymer/polymer/lib/legacy/legacy-element-mixin.js'; |
| import {PolymerElement} from '@polymer/polymer/polymer-element.js'; |
| import {htmlTemplate} from './gr-external-style_html.js'; |
| import {pluginEndpoints} from '../../shared/gr-js-api-interface/gr-plugin-endpoints.js'; |
| import {pluginLoader} from '../../shared/gr-js-api-interface/gr-plugin-loader.js'; |
| |
| /** @extends Polymer.Element */ |
| class GrExternalStyle extends GestureEventListeners( |
| LegacyElementMixin( |
| PolymerElement)) { |
| static get template() { return htmlTemplate; } |
| |
| static get is() { return 'gr-external-style'; } |
| |
| static get properties() { |
| return { |
| name: String, |
| _urlsImported: { |
| type: Array, |
| value() { return []; }, |
| }, |
| _stylesApplied: { |
| type: Array, |
| value() { return []; }, |
| }, |
| }; |
| } |
| |
| _importHref(url, resolve, reject) { |
| // It is impossible to mock es6-module imported function. |
| // The _importHref function is mocked in test. |
| importHref(url, resolve, reject); |
| } |
| |
| /** |
| * @suppress {checkTypes} |
| */ |
| _import(url) { |
| if (this._urlsImported.includes(url)) { return Promise.resolve(); } |
| this._urlsImported.push(url); |
| return new Promise((resolve, reject) => { |
| this._importHref(url, resolve, reject); |
| }); |
| } |
| |
| _applyStyle(name) { |
| if (this._stylesApplied.includes(name)) { return; } |
| this._stylesApplied.push(name); |
| |
| const s = document.createElement('style'); |
| s.setAttribute('include', name); |
| const cs = document.createElement('custom-style'); |
| cs.appendChild(s); |
| // When using Shadow DOM <custom-style> must be added to the <body>. |
| // Within <gr-external-style> itself the styles would have no effect. |
| const topEl = document.getElementsByTagName('body')[0]; |
| topEl.insertBefore(cs, topEl.firstChild); |
| updateStyles(); |
| } |
| |
| _importAndApply() { |
| Promise.all(pluginEndpoints.getPlugins(this.name).map( |
| pluginUrl => this._import(pluginUrl)) |
| ).then(() => { |
| const moduleNames = pluginEndpoints.getModules(this.name); |
| for (const name of moduleNames) { |
| this._applyStyle(name); |
| } |
| }); |
| } |
| |
| /** @override */ |
| attached() { |
| super.attached(); |
| this._importAndApply(); |
| } |
| |
| /** @override */ |
| ready() { |
| super.ready(); |
| pluginLoader.awaitPluginsLoaded().then(() => this._importAndApply()); |
| } |
| } |
| |
| customElements.define(GrExternalStyle.is, GrExternalStyle); |
