| // Copyright 2018 The Chromium Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| cr.define('downloads', function() { |
| class IconLoader { |
| constructor() { |
| /** @private {!Object<!PromiseResolver<boolean>>} */ |
| this.iconResolvers_ = {}; |
| |
| /** @private {!Set<!HTMLImageElement>} */ |
| this.listeningImages_ = new Set(); |
| } |
| |
| /** |
| * @param {!HTMLImageElement} imageEl |
| * @param {string} filePath |
| * @return {!Promise<boolean>} Whether or not the icon loaded successfully. |
| */ |
| loadIcon(imageEl, filePath) { |
| const url = cr.icon.getFileIconUrl(filePath); |
| |
| if (!this.iconResolvers_[url]) { |
| this.iconResolvers_[url] = new PromiseResolver(); |
| } |
| |
| if (!this.listeningImages_.has(imageEl)) { |
| imageEl.addEventListener('load', this.finishedLoading_.bind(this)); |
| imageEl.addEventListener('error', this.finishedLoading_.bind(this)); |
| this.listeningImages_.add(imageEl); |
| } |
| |
| imageEl.src = url; |
| |
| return assert(this.iconResolvers_[url]).promise; |
| } |
| |
| /** |
| * @param {!Event} e |
| * @private |
| */ |
| finishedLoading_(e) { |
| const resolver = assert(this.iconResolvers_[e.currentTarget.src]); |
| if (!resolver.isFulfilled) |
| resolver.resolve(e.type == 'load'); |
| } |
| } |
| |
| cr.addSingletonGetter(IconLoader); |
| |
| return {IconLoader: IconLoader}; |
| }); |