76 lines
2.3 KiB
Dart
76 lines
2.3 KiB
Dart
import 'package:flutter/material.dart';
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import 'package:shared_preferences/shared_preferences.dart';
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import 'package:sxchnge_wallet/sxchnge_wallet.dart';
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class LocaleProvider extends ChangeNotifier {
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static const storageKey = 'sxchnge_last_locale';
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LocaleProvider({Locale initialLocale = const Locale('en'), this.preferences})
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: _locale = resolve(initialLocale.languageCode, const []);
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Locale _locale;
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bool _disposed = false;
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final SharedPreferences? preferences;
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Future<bool> _pendingSave = Future.value(true);
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Locale get locale => _locale;
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static Locale resolve(String? saved, List<Locale> systemLocales) {
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final code =
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saved?.split(RegExp('[-_]')).first ??
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(systemLocales.isEmpty ? 'en' : systemLocales.first.languageCode);
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return Locale(code == 'ru' ? 'ru' : 'en');
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}
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static Future<LocaleProvider> load(List<Locale> systemLocales) async {
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try {
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final prefs = await SharedPreferences.getInstance();
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return LocaleProvider(
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initialLocale: resolve(prefs.getString(storageKey), systemLocales),
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preferences: prefs,
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);
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} catch (_) {
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return LocaleProvider(initialLocale: resolve(null, systemLocales));
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}
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}
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Future<void> loadAccount(WalletProvider wallet) async {
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await wallet.loadProfile();
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if (_disposed) return;
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if (wallet.preferredLocale != null && !wallet.profileFailed) {
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_locale = resolve(wallet.preferredLocale, const []);
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notifyListeners();
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}
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}
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Future<void> saveAccountLocale(WalletProvider wallet, Locale value) async {
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if (_disposed || wallet.saving) return;
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_locale = resolve(value.languageCode, const []);
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notifyListeners();
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await wallet.saveLocale(_locale.languageCode);
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}
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Future<bool> setLocale(Locale value) {
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final next = resolve(value.languageCode, const []);
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if (next == _locale) return _pendingSave;
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_locale = next;
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notifyListeners();
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// Serialize writes so rapid language changes persist the last selection.
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_pendingSave = _pendingSave.then((_) async {
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try {
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return await preferences?.setString(storageKey, next.languageCode) ??
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false;
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} catch (_) {
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return false;
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}
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});
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return _pendingSave;
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}
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@override
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void dispose() {
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_disposed = true;
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super.dispose();
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}
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}
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