64 lines
1.6 KiB
TypeScript
64 lines
1.6 KiB
TypeScript
/**
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* @license
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* Copyright Google Inc. All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.io/license
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*/
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import {Inject, Injectable} from '@angular/core';
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import {DOCUMENT} from './dom_tokens';
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@Injectable()
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export class SharedStylesHost {
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/** @internal */
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_styles: string[] = [];
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/** @internal */
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_stylesSet = new Set<string>();
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constructor() {}
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addStyles(styles: string[]) {
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const additions: any[] /** TODO #9100 */ = [];
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styles.forEach(style => {
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if (!this._stylesSet.has(style)) {
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this._stylesSet.add(style);
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this._styles.push(style);
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additions.push(style);
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}
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});
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this.onStylesAdded(additions);
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}
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onStylesAdded(additions: string[]) {}
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getAllStyles(): string[] { return this._styles; }
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}
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@Injectable()
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export class DomSharedStylesHost extends SharedStylesHost {
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private _hostNodes = new Set<Node>();
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constructor(@Inject(DOCUMENT) doc: any) {
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super();
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this._hostNodes.add(doc.head);
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}
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/** @internal */
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_addStylesToHost(styles: string[], host: Node) {
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for (let i = 0; i < styles.length; i++) {
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const styleEl = document.createElement('style');
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styleEl.textContent = styles[i];
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host.appendChild(styleEl);
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}
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}
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addHost(hostNode: Node) {
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this._addStylesToHost(this._styles, hostNode);
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this._hostNodes.add(hostNode);
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}
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removeHost(hostNode: Node) { this._hostNodes.delete(hostNode); }
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onStylesAdded(additions: string[]) {
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this._hostNodes.forEach((hostNode) => { this._addStylesToHost(additions, hostNode); });
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}
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}
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