/*--------------------------------------------------------------------------------------------- * Copyright (c) Microsoft Corporation. All rights reserved. * Licensed under the MIT License. See License.txt in the project root for license information. *--------------------------------------------------------------------------------------------*/ import { MessagePoster } from './messaging'; export class StyleLoadingMonitor { private unloadedStyles: string[] = []; private finishedLoading: boolean = false; private poster?: MessagePoster; constructor() { const onStyleLoadError = (event: any) => { const source = event.target.dataset.source; this.unloadedStyles.push(source); }; window.addEventListener('DOMContentLoaded', () => { for (const link of document.getElementsByClassName('code-user-style') as HTMLCollectionOf<HTMLElement>) { if (link.dataset.source) { link.onerror = onStyleLoadError; } } }); window.addEventListener('load', () => { if (!this.unloadedStyles.length) { return; } this.finishedLoading = true; if (this.poster) { this.poster.postMessage('previewStyleLoadError', { unloadedStyles: this.unloadedStyles }); } }); } public setPoster(poster: MessagePoster): void { this.poster = poster; if (this.finishedLoading) { poster.postMessage('previewStyleLoadError', { unloadedStyles: this.unloadedStyles }); } } }