98 lines
2.9 KiB
JavaScript
98 lines
2.9 KiB
JavaScript
/*
|
|
* Copyright (C) 2020-2022 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
|
|
* StringUtil
|
|
*/
|
|
|
|
class MediaLoader {
|
|
constructor() {
|
|
this._token = {};
|
|
this._mediaCache = new Map();
|
|
this._loadMediaData = [];
|
|
}
|
|
|
|
async loadMedia(path, dictionary, onLoad, onUnload) {
|
|
const token = this._token;
|
|
const data = {onUnload, loaded: false};
|
|
|
|
this._loadMediaData.push(data);
|
|
|
|
const media = await this.getMedia(path, dictionary);
|
|
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, dictionary) {
|
|
let cachedData;
|
|
let dictionaryCache = this._mediaCache.get(dictionary);
|
|
if (typeof dictionaryCache !== 'undefined') {
|
|
cachedData = dictionaryCache.get(path);
|
|
} else {
|
|
dictionaryCache = new Map();
|
|
this._mediaCache.set(dictionary, dictionaryCache);
|
|
}
|
|
|
|
if (typeof cachedData === 'undefined') {
|
|
cachedData = {
|
|
promise: null,
|
|
data: null,
|
|
url: null
|
|
};
|
|
dictionaryCache.set(path, cachedData);
|
|
cachedData.promise = this._getMediaData(path, dictionary, cachedData);
|
|
}
|
|
|
|
return cachedData.promise;
|
|
}
|
|
|
|
async _getMediaData(path, dictionary, cachedData) {
|
|
const token = this._token;
|
|
const data = (await yomichan.api.getMedia([{path, dictionary}]))[0];
|
|
if (token === this._token && data !== null) {
|
|
const buffer = StringUtil.base64ToArrayBuffer(data.content);
|
|
const blob = new Blob([buffer], {type: data.mediaType});
|
|
const url = URL.createObjectURL(blob);
|
|
cachedData.data = data;
|
|
cachedData.url = url;
|
|
}
|
|
return cachedData;
|
|
}
|
|
}
|