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- // @flow
-
- import {AsyncStorage} from "react-native";
-
- /**
- * Static class used to manage preferences.
- * Preferences are fetched at the start of the app and saved in an instance object.
- * This allows for a synchronous access to saved data.
- */
-
- export default class AsyncStorageManager {
-
- static instance: AsyncStorageManager | null = null;
-
- /**
- * Get this class instance or create one if none is found
- * @returns {ThemeManager}
- */
- static getInstance(): AsyncStorageManager {
- return AsyncStorageManager.instance === null ?
- AsyncStorageManager.instance = new AsyncStorageManager() :
- AsyncStorageManager.instance;
- }
-
- // Object storing preferences keys, default and current values for use in the app
- preferences = {
- showIntro: {
- key: 'showIntro',
- default: '1',
- current: '',
- },
- proxiwashNotifications: {
- key: 'proxiwashNotifications',
- default: '5',
- current: '',
- },
- proxiwashWatchedMachines: {
- key: 'proxiwashWatchedMachines',
- default: '[]',
- current: '',
- },
- nightMode: {
- key: 'nightMode',
- default: '0',
- current: '',
- }
- };
-
- /**
- * Set preferences object current values from AsyncStorage.
- * This function should be called at the app's start.
- *
- * @return {Promise<void>}
- */
- async loadPreferences() {
- let prefKeys = [];
- // Get all available keys
- for (let [key, value] of Object.entries(this.preferences)) {
- prefKeys.push(value.key);
- }
- // Get corresponding values
- let resultArray: Array<Array<string>> = await AsyncStorage.multiGet(prefKeys);
- // Save those values for later use
- for (let i = 0; i < resultArray.length; i++) {
- let key: string = resultArray[i][0];
- let val: string | null = resultArray[i][1];
- if (val === null)
- val = this.preferences[key].default;
- this.preferences[key].current = val;
- }
- }
-
- /**
- * Save the value associated to the given key to preferences.
- * This updates the preferences object and saves it to AsynStorage.
- *
- * @param key
- * @param val
- */
- savePref(key: string, val: string) {
- this.preferences[key].current = val;
- AsyncStorage.setItem(key, val);
- }
-
- }
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