| /** |
| * @license |
| * Copyright 2017 Google LLC |
| * SPDX-License-Identifier: Apache-2.0 |
| */ |
| import {updateStyles} from '@polymer/polymer/lib/mixins/element-mixin'; |
| import {LitElement, html, PropertyValues} from 'lit'; |
| import {customElement, property} from 'lit/decorators.js'; |
| import {pluginLoaderToken} from '../../shared/gr-js-api-interface/gr-plugin-loader'; |
| import {resolve} from '../../../models/dependency'; |
| |
| @customElement('gr-external-style') |
| export class GrExternalStyle extends LitElement { |
| // This is a required value for this component. |
| @property({type: String, reflect: true}) |
| name!: string; |
| |
| // private but used in test |
| stylesApplied: string[] = []; |
| |
| stylesElements: HTMLElement[] = []; |
| |
| private readonly getPluginLoader = resolve(this, pluginLoaderToken); |
| |
| override render() { |
| return html`<slot></slot>`; |
| } |
| |
| override willUpdate(changedProperties: PropertyValues) { |
| if (changedProperties.has('name')) { |
| // We remove all styles defined for different name. |
| this.removeStyles(); |
| this.importAndApply(); |
| this.getPluginLoader() |
| .awaitPluginsLoaded() |
| .then(() => this.importAndApply()); |
| } |
| } |
| |
| // private but used in test |
| applyStyle(name: string) { |
| 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'); |
| this.stylesElements.push(cs); |
| 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(); |
| } |
| |
| removeStyles() { |
| this.stylesElements.forEach(el => el.remove()); |
| this.stylesElements = []; |
| this.stylesApplied = []; |
| } |
| |
| private importAndApply() { |
| const moduleNames = this.getPluginLoader().pluginEndPoints.getModules( |
| this.name |
| ); |
| for (const name of moduleNames) { |
| this.applyStyle(name); |
| } |
| } |
| } |
| |
| declare global { |
| interface HTMLElementTagNameMap { |
| 'gr-external-style': GrExternalStyle; |
| } |
| } |
