language cubit added

Author: thisisyusub

lib/bloc/app_bloc_observer.dart

@@ -11,22 +11,22 @@ class AppBlocObserver implements BlocObserver {
 
   @override
   void onEvent(Bloc bloc, Object? event) {
-    _logger.info('$bloc => $event');
+    _logger.info('${bloc.runtimeType} => $event');
   }
 
   @override
   void onChange(BlocBase bloc, Change change) {
-    _logger.info('$bloc => $change');
+    _logger.info('${bloc.runtimeType} => $change');
   }
 
   @override
   void onTransition(Bloc bloc, Transition transition) {
-    _logger.info('$bloc => $transition');
+    _logger.info('${bloc.runtimeType} => $transition');
   }
 
   @override
   void onError(BlocBase bloc, Object error, StackTrace stackTrace) {
-    _logger.severe('$bloc => $error, $stackTrace');
+    _logger.severe('${bloc.runtimeType} => $error, $stackTrace');
   }
 
   @override

lib/bloc/language/language_cubit.dart

@@ -0,0 +1,20 @@
+import 'package:flutter/material.dart';
+import 'package:flutter_bloc/flutter_bloc.dart';
+
+import '../../services/preferences_service.dart';
+
+class LanguageCubit extends Cubit<Locale> {
+  LanguageCubit(Locale initialLocale) : super(initialLocale) {
+    final locale = PreferencesService.instance.locale;
+    emit(locale ?? initialLocale);
+  }
+
+  void changeLocale(Locale locale) async {
+    if (state == locale) {
+      return;
+    }
+
+    await PreferencesService.instance.changeLocale(locale);
+    emit(locale);
+  }
+}

lib/constants/.gitkeep

@@ -1,6 +1,7 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_bloc/flutter_bloc.dart';
 
+import 'bloc/language/language_cubit.dart';
 import 'bloc/theme/theme_cubit.dart';
 import 'config/init.dart';
 import 'presentation/app.dart';
@@ -14,6 +15,9 @@ void main() async {
         BlocProvider(
           create: (_) => ThemeCubit(ThemeMode.system),
         ),
+        BlocProvider(
+          create: (_) => LanguageCubit(Locale('en', 'US')),
+        ),
       ],
       child: App(),
     ),

lib/main.dart

@@ -4,6 +4,7 @@ import 'package:flutter_gen/gen_l10n/app_localizations.dart';
 import 'package:flutter_localizations/flutter_localizations.dart';
 import 'package:logging/logging.dart';
 
+import '../bloc/language/language_cubit.dart';
 import '../bloc/theme/theme_cubit.dart';
 import 'values/app_themes.dart';
 import 'values/supported_locales.dart';
@@ -12,12 +13,14 @@ class App extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     final themeMode = context.watch<ThemeCubit>().state;
+    final locale = context.watch<LanguageCubit>().state;
 
     return MaterialApp(
       title: 'Placeholder Title',
       themeMode: themeMode,
       theme: AppThemes.lightTheme,
       darkTheme: AppThemes.darkTheme,
+      locale: locale,
       supportedLocales: supportedLocales,
       localizationsDelegates: [
         GlobalMaterialLocalizations.delegate,
@@ -63,6 +66,8 @@ class _DemoPageState extends State<DemoPage> {
   Widget build(BuildContext context) {
     final themeCubit = context.watch<ThemeCubit>();
     final themeMode = themeCubit.state;
+    final languageCubit = context.watch<LanguageCubit>();
+    final locale = languageCubit.state;
 
     return Scaffold(
       appBar: AppBar(
@@ -75,11 +80,41 @@ class _DemoPageState extends State<DemoPage> {
           style: Theme.of(context).textTheme.headline6,
         ),
       ),
-      floatingActionButton: Switch(
-        value: themeMode == ThemeMode.dark,
-        onChanged: (value) {
-          themeCubit.changeTheme(value ? ThemeMode.dark : ThemeMode.light);
-        },
+      floatingActionButton: Column(
+        mainAxisSize: MainAxisSize.min,
+        crossAxisAlignment: CrossAxisAlignment.center,
+        children: [
+          Row(
+            mainAxisAlignment: MainAxisAlignment.center,
+            children: [
+              Text('Theme:'),
+              SizedBox(width: 10),
+              Switch(
+                value: themeMode == ThemeMode.dark,
+                onChanged: (value) {
+                  themeCubit.changeTheme(
+                    value ? ThemeMode.dark : ThemeMode.light,
+                  );
+                },
+              )
+            ],
+          ),
+          Row(
+            mainAxisAlignment: MainAxisAlignment.center,
+            children: [
+              Text('Language:'),
+              SizedBox(width: 10),
+              Switch(
+                value: locale == Locale('az', 'AZ'),
+                onChanged: (value) {
+                  languageCubit.changeLocale(
+                    value ? Locale('az', 'AZ') : Locale('en', 'US'),
+                  );
+                },
+              )
+            ],
+          ),
+        ],
       ),
       floatingActionButtonLocation: FloatingActionButtonLocation.centerFloat,
     );

lib/presentation/app.dart

@@ -23,6 +23,8 @@ class PreferencesService {
   }
 
   final _themeModeKey = 'themeMode';
+  final _languageCodeKey = 'languageCode';
+  final _countryCodeKey = 'countryCode';
 
   Future<void> changeThemeMode(ThemeMode themeMode) async {
     _sharedPreferences?.setInt(_themeModeKey, themeMode.index);
@@ -37,4 +39,30 @@ class PreferencesService {
 
     return null;
   }
+
+  Future<void> changeLocale(Locale locale) async {
+    _sharedPreferences?.setString(_languageCodeKey, locale.languageCode);
+    _sharedPreferences?.setString(_countryCodeKey, locale.countryCode ?? '');
+  }
+
+  Locale? get locale {
+    final languageCode = _sharedPreferences?.getString(_languageCodeKey);
+    final countryCode = _sharedPreferences?.getString(_countryCodeKey);
+
+    if (languageCode != null) {
+      late String? country;
+
+      if (countryCode != null) {
+        if (countryCode.isEmpty) {
+          country = null;
+        } else {
+          country = countryCode;
+        }
+      }
+
+      return Locale(languageCode, country);
+    }
+
+    return null;
+  }
 }