/* * Copyright (C) 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/>. */ class PersistentStorageController { constructor() { this._persistentStorageCheckbox = false; } async prepare() { this._persistentStorageCheckbox = document.querySelector('#storage-persistent-checkbox'); this._persistentStorageCheckbox.addEventListener('change', this._onPersistentStorageCheckboxChange.bind(this), false); if (!this._isPersistentStorageSupported()) { return; } const info = document.querySelector('#storage-persistent-info'); if (info !== null) { info.hidden = false; } const isStoragePeristent = await this.isStoragePeristent(); this._updateCheckbox(isStoragePeristent); } async isStoragePeristent() { try { return await navigator.storage.persisted(); } catch (e) { // NOP } return false; } // Private _onPersistentStorageCheckboxChange(e) { const node = e.currentTarget; if (node.checked) { node.checked = false; this._attemptPersistStorage(); } else { node.checked = true; } } async _attemptPersistStorage() { let isStoragePeristent = false; try { isStoragePeristent = await navigator.storage.persist(); } catch (e) { // NOP } this._updateCheckbox(isStoragePeristent); const node = document.querySelector('#storage-persistent-fail-warning'); if (node !== null) { node.hidden = isStoragePeristent; } yomichan.trigger('storageChanged'); } _isPersistentStorageSupported() { return isObject(navigator.storage) && typeof navigator.storage.persist === 'function'; } _updateCheckbox(isStoragePeristent) { this._persistentStorageCheckbox.checked = isStoragePeristent; this._persistentStorageCheckbox.readOnly = isStoragePeristent; } }