Initial commit — DLS lab-app Flutter project

lib/core/providers/locale_provider.dart

@@ -0,0 +1,39 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
+import 'package:shared_preferences/shared_preferences.dart';
+import '../l10n/app_strings.dart';
+
+const _kLocaleKey = 'app_locale';
+
+class LocaleNotifier extends StateNotifier<Locale> {
+  LocaleNotifier(Locale initial) : super(initial);
+
+  Future<void> setLocale(Locale locale) async {
+    state = locale;
+    final prefs = await SharedPreferences.getInstance();
+    await prefs.setString(_kLocaleKey, locale.languageCode);
+  }
+
+  static Future<Locale> load() async {
+    final prefs = await SharedPreferences.getInstance();
+    final code = prefs.getString(_kLocaleKey) ?? 'tr';
+    return Locale(code);
+  }
+}
+
+final localeProvider = StateNotifierProvider<LocaleNotifier, Locale>(
+  (ref) => LocaleNotifier(const Locale('tr')),
+);
+
+final stringsProvider = Provider<AppStrings>((ref) {
+  final locale = ref.watch(localeProvider);
+  return AppStrings.of(locale.languageCode);
+});
+
+const supportedLocales = [
+  Locale('tr'),
+  Locale('en'),
+  Locale('ru'),
+  Locale('ar'),
+  Locale('de'),
+];