57 lines
1.6 KiB
Dart
57 lines
1.6 KiB
Dart
// Author: fruit.com.cn
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import 'package:flutter/widgets.dart';
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import 'package:shared_preferences/shared_preferences.dart';
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/// Resolves the selected or system language to one of the supported app locales.
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///
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/// Indonesian is the launch-market fallback when a device uses an unsupported
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/// language. The legacy `in` code is treated as Indonesian as well.
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Locale resolveAppLocale(Locale? selected, Locale? deviceLocale) {
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final code = (selected ?? deviceLocale)?.languageCode;
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return switch (code) {
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'zh' => const Locale('zh'),
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'en' => const Locale('en'),
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_ => const Locale('id'),
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};
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}
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class LocaleController extends ChangeNotifier {
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LocaleController({SharedPreferencesAsync? preferences})
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: _preferences = preferences ?? SharedPreferencesAsync();
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final SharedPreferencesAsync _preferences;
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Locale? _locale;
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Locale? get locale => _locale;
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Future<void> load() async {
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try {
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final code = await _preferences.getString('ui.locale');
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_locale = switch (code) {
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'en' => const Locale('en'),
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'zh' => const Locale('zh'),
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'id' => const Locale('id'),
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_ => null,
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};
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notifyListeners();
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} catch (_) {
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// The system locale remains usable if preferences are unavailable.
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}
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}
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Future<void> select(String code) async {
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_locale = switch (code) {
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'en' => const Locale('en'),
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'zh' => const Locale('zh'),
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'id' => const Locale('id'),
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_ => null,
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};
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notifyListeners();
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try {
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await _preferences.setString('ui.locale', code);
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} catch (_) {
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// Preference persistence is best effort for this prototype.
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}
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}
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}
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