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Diffstat (limited to 'ext/mixed/js/media-loader.js')
-rw-r--r-- | ext/mixed/js/media-loader.js | 107 |
1 files changed, 0 insertions, 107 deletions
diff --git a/ext/mixed/js/media-loader.js b/ext/mixed/js/media-loader.js deleted file mode 100644 index 5974e31a..00000000 --- a/ext/mixed/js/media-loader.js +++ /dev/null @@ -1,107 +0,0 @@ -/* - * Copyright (C) 2020-2021 Yomichan Authors - * - * This program is free software: you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation, either version 3 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program. If not, see <https://www.gnu.org/licenses/>. - */ - -/* global - * api - */ - -class MediaLoader { - constructor() { - this._token = {}; - this._mediaCache = new Map(); - this._loadMediaData = []; - } - - async loadMedia(path, dictionaryName, onLoad, onUnload) { - const token = this._token; - const data = {onUnload, loaded: false}; - - this._loadMediaData.push(data); - - const media = await this.getMedia(path, dictionaryName); - if (token !== this._token) { return; } - - onLoad(media.url); - data.loaded = true; - } - - unloadAll() { - for (const {onUnload, loaded} of this._loadMediaData) { - if (typeof onUnload === 'function') { - onUnload(loaded); - } - } - this._loadMediaData = []; - - for (const map of this._mediaCache.values()) { - for (const {url} of map.values()) { - if (url !== null) { - URL.revokeObjectURL(url); - } - } - } - this._mediaCache.clear(); - - this._token = {}; - } - - async getMedia(path, dictionaryName) { - let cachedData; - let dictionaryCache = this._mediaCache.get(dictionaryName); - if (typeof dictionaryCache !== 'undefined') { - cachedData = dictionaryCache.get(path); - } else { - dictionaryCache = new Map(); - this._mediaCache.set(dictionaryName, dictionaryCache); - } - - if (typeof cachedData === 'undefined') { - cachedData = { - promise: null, - data: null, - url: null - }; - dictionaryCache.set(path, cachedData); - cachedData.promise = this._getMediaData(path, dictionaryName, cachedData); - } - - return cachedData.promise; - } - - async _getMediaData(path, dictionaryName, cachedData) { - const token = this._token; - const data = (await api.getMedia([{path, dictionaryName}]))[0]; - if (token === this._token && data !== null) { - const contentArrayBuffer = this._base64ToArrayBuffer(data.content); - const blob = new Blob([contentArrayBuffer], {type: data.mediaType}); - const url = URL.createObjectURL(blob); - cachedData.data = data; - cachedData.url = url; - } - return cachedData; - } - - _base64ToArrayBuffer(content) { - const binaryContent = window.atob(content); - const length = binaryContent.length; - const array = new Uint8Array(length); - for (let i = 0; i < length; ++i) { - array[i] = binaryContent.charCodeAt(i); - } - return array.buffer; - } -} |