Refactor

lib/core/localization/locale_preferences.dart

@@ -0,0 +1,28 @@
+import 'package:hiddify/core/preferences/preferences_provider.dart';
+import 'package:hiddify/gen/translations.g.dart';
+import 'package:riverpod_annotation/riverpod_annotation.dart';
+
+part 'locale_preferences.g.dart';
+
+@Riverpod(keepAlive: true)
+class LocalePreferences extends _$LocalePreferences {
+  @override
+  AppLocale build() {
+    final persisted =
+        ref.watch(sharedPreferencesProvider).requireValue.getString("locale");
+    if (persisted == null) return AppLocaleUtils.findDeviceLocale();
+    // keep backward compatibility with chinese after changing zh to zh_CN
+    if (persisted == "zh") {
+      return AppLocale.zhCn;
+    }
+    return AppLocale.values.byName(persisted);
+  }
+
+  Future<void> changeLocale(AppLocale value) async {
+    state = value;
+    await ref
+        .read(sharedPreferencesProvider)
+        .requireValue
+        .setString("locale", value.name);
+  }
+}