Flutter 3.38 — Что нового во Flutter?

Зацените код

void main() {
WidgetsFlutterBinding.ensureInitialized();
runApp(
ChangeNotifierProvider(
create: (context) => GalleryProvider(),
child: MyApp(),
),
);
}

class MyApp extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Geo Album',
theme: ThemeData.dark().copyWith(
scaffoldBackgroundColor: Colors.grey[900],
appBarTheme: AppBarTheme(
backgroundColor: Colors.grey[900],
elevation: 2,
centerTitle: true,
iconTheme: IconThemeData(color: Colors.white),
),
cardTheme: CardTheme(
color: Colors.grey[850],
elevation: 4,
shape: RoundedRectangleBorder(
borderRadius: BorderRadius.circular(12),
),
),
),
debugShowCheckedModeBanner: false,
initialRoute: '/',
routes: {
'/': (context) => HomeScreen(),
'/settings': (context) => SettingsScreen(),
},
);
}
}

class SettingsScreen extends StatefulWidget {
@override
State createState() => _SettingsScreenState();
}

class _SettingsScreenState extends State {
// Состояние хранится прямо здесь, без провайдеров
String selectedMapType = 'OpenStreetMap';
bool isLoading = false;

String getMapUrl(String type) {
switch (type) {
case 'Satellite':
return 'https://server.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer/tile/{z}/{y}/{x}';
case 'Terrain':
return 'https://tile.opentopomap.org/{z}/{x}/{y}.png';
default:
return 'https://tile.openstreetmap.org/{z}/{x}/{y}.png';
}
}

@override
Widget build(BuildContext context) {
final galleryProvider = Provider.of(context);

final screenWidth = MediaQuery.of(context).size.width;
final isTablet = screenWidth > 600;
final padding = isTablet ? 24.0 : 16.0;
final fontSize = isTablet ? 20.0 : 18.0;
final buttonHeight = isTablet ? 56.0 : 48.0;

return Scaffold(
  appBar: AppBar(
    title: Text('Настройки'),
    leading: IconButton(
      icon: Icon(Icons.arrow_back),
      onPressed: () => Navigator.pop(context),
    ),
    actions: [
      IconButton(
        icon: Icon(Icons.info_outline),
        onPressed: () {
          showDialog(
            context: context,
            builder: (context) => AlertDialog(
              title: Text('О приложении'),
              content: Text(
                'Geo Album v1.0.0\n\n'
                'Приложение для просмотра фотографий с геометками\n\n'
                'Всего фото: ${galleryProvider.images.length}'
              ),
              actions: [
                TextButton(
                  onPressed: () => Navigator.pop(context),
                  child: Text('OK'),
                ),
              ],
            ),
          );
        },
      ),
    ],
  ),
  body: Container( 
    child: ListView(
      padding: EdgeInsets.all(padding),
      children: [
        // КАРТОЧКА: Выбор типа карты
        Card(
          child: Padding(
            padding: EdgeInsets.all(16),
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Text(
                  'Тип карты',
                  style: TextStyle(
                    fontSize: fontSize,
                    fontWeight: FontWeight.bold,
                  ),
                ),
                SizedBox(height: 8),
                
                RadioListTile(
                  title: Text('OpenStreetMap'),
                  subtitle: Text('Стандартная карта'),
                  value: 'OpenStreetMap',
                  groupValue: selectedMapType,
                  onChanged: (value) {
                    setState(() {
                      selectedMapType = value!;
                    });
                    ScaffoldMessenger.of(context).showSnackBar(
                      SnackBar(
                        content: Text('Карта изменена на $value'),
                        duration: Duration(seconds: 2),
                      ),
                    );
                  },
                ),
                
                RadioListTile(
                  title: Text('Satellite'),
                  subtitle: Text('Спутниковый вид'),
                  value: 'Satellite',
                  groupValue: selectedMapType,
                  onChanged: (value) {
                    setState(() {
                      selectedMapType = value!;
                    });
                    ScaffoldMessenger.of(context).showSnackBar(
                      SnackBar(
                        content: Text('Карта изменена на $value'),
                        duration: Duration(seconds: 2),
                      ),
                    );
                  },
                ),
                
                RadioListTile(
                  title: Text('Terrain'),
                  subtitle: Text('Рельеф местности'),
                  value: 'Terrain',
                  groupValue: selectedMapType,
                  onChanged: (value) {
                    setState(() {
                      selectedMapType = value!;
                    });
                    ScaffoldMessenger.of(context).showSnackBar(
                      SnackBar(
                        content: Text('Карта изменена на $value'),
                        duration: Duration(seconds: 2),
                      ),
                    );
                  },
                ),
                
                SizedBox(height: 8),
                Container( // ОШИБКА 3: ещё один лишний Container
                  padding: EdgeInsets.all(8),
                  decoration: BoxDecoration(
                    color: Colors.grey[800],
                    borderRadius: BorderRadius.circular(8),
                  ),
                  child: Column(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: [
                      Text(
                        'Текущий URL:',
                        style: TextStyle(
                          fontSize: 12,
                          color: Colors.grey[400],
                        ),
                      ),
                      SizedBox(height: 4),
                      Text(
                        getMapUrl(selectedMapType),
                        style: TextStyle(
                          fontSize: 11,
                          fontFamily: 'monospace',
                          color: Colors.orange,
                        ),
                      ),
                    ],
                  ),
                ),
              ],
            ),
          ),
        ),
        
        SizedBox(height: 24),
        
        
        Card(
          child: Padding(
            padding: EdgeInsets.all(16),
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Text(
                  'Управление кэшем',
                  style: TextStyle(
                    fontSize: fontSize,
                    fontWeight: FontWeight.bold,
                  ),
                ),
                SizedBox(height: 16),
                
                
                ElevatedButton.icon(
                  icon: Icon(Icons.map_outlined),
                  label: Text('Очистить кэш карты'),
                  style: ElevatedButton.styleFrom(
                    backgroundColor: Colors.orange,
                    minimumSize: Size(double.infinity, buttonHeight),
                  ),
                  onPressed: isLoading ? null : () async {
                    setState(() {
                      isLoading = true;
                    });
                    
                    
                    await Future.delayed(Duration(seconds: 1));
                    
                    
                    setState(() {
                      isLoading = false;
                    });
                    
                    ScaffoldMessenger.of(context).showSnackBar(
                      SnackBar(content: Text('Кэш карты очищен')),
                    );
                  },
                ),
                
                SizedBox(height: 12),
                
              
                ElevatedButton.icon(
                  icon: Icon(Icons.image_outlined),
                  label: Text('Очистить миниатюры'),
                  style: ElevatedButton.styleFrom(
                    backgroundColor: Colors.red,
                    minimumSize: Size(double.infinity, buttonHeight),
                  ),
                  onPressed: isLoading ? null : () async {
                    setState(() {
                      isLoading = true;
                    });
                    
                    await Future.delayed(Duration(seconds: 1));
                    
                    setState(() {
                      isLoading = false;
                    });
                    
                    ScaffoldMessenger.of(context).showSnackBar(
                      SnackBar(content: Text('Миниатюры очищены')),
                    );
                  },
                ),
                
                
                if (isLoading == true)
                  Padding(
                    padding: EdgeInsets.only(top: 16),
                    child: Center(
                      child: CircularProgressIndicator(),
                    ),
                  ),
              ],
            ),
          ),
        ),
        
        SizedBox(height: 24),
        
    
        Card(
          child: Padding(
            padding: EdgeInsets.all(16),
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Text(
                  'Статистика',
                  style: TextStyle(
                    fontSize: fontSize,
                    fontWeight: FontWeight.bold,
                  ),
                ),
                SizedBox(height: 16),
                
                
                Row(
                  mainAxisAlignment: MainAxisAlignment.spaceBetween,
                  children: [
                    Text(
                      'Всего фото',
                      style: TextStyle(color: Colors.grey[400]),
                    ),
                    Text(
                      '${galleryProvider.images.length}',
                      style: TextStyle(
                        fontWeight: FontWeight.bold,
                        fontSize: 16,
                      ),
                    ),
                  ],
                ),
                
                SizedBox(height: 8),
                
                Row(
                  mainAxisAlignment: MainAxisAlignment.spaceBetween,
                  children: [
                    Text(
                      'С геометками',
                      style: TextStyle(color: Colors.grey[400]),
                    ),
                    Text(
                      '${galleryProvider.images.where((img) => img.latitude != null).length}',
                      style: TextStyle(
                        fontWeight: FontWeight.bold,
                        fontSize: 16,
                      ),
                    ),
                  ],
                ),
                
                SizedBox(height: 8),
                
                Row(
                  mainAxisAlignment: MainAxisAlignment.spaceBetween,
                  children: [
                    Text(
                      'Без геометок',
                      style: TextStyle(color: Colors.grey[400]),
                    ),
                    Text(
                  
                      '${galleryProvider.images.length - galleryProvider.images.where((img) => img.latitude != null).length}',
                      style: TextStyle(
                        fontWeight: FontWeight.bold,
                        fontSize: 16,
                      ),
                    ),
                  ],
                ),
                
                SizedBox(height: 16),
                Divider(),
                SizedBox(height: 8),
                
                Text(
                  'Адаптивность',
                  style: TextStyle(color: Colors.grey[400]),
                ),
                SizedBox(height: 8),
                Row(
                  mainAxisAlignment: MainAxisAlignment.spaceBetween,
                  children: [
                    Text('Тип устройства'),
                    Text(
                      isTablet ? 'Планшет' : 'Телефон',
                      style: TextStyle(fontWeight: FontWeight.bold),
                    ),
                  ],
                ),
                SizedBox(height: 8),
                Row(
                  mainAxisAlignment: MainAxisAlignment.spaceBetween,
                  children: [
                    Text('Ширина экрана'),
                    Text(
                      '${screenWidth.toInt()} px',
                      style: TextStyle(fontWeight: FontWeight.bold),
                    ),
                  ],
                ),
              ],
            ),
          ),
        ),
        
      
        SizedBox(height: isTablet ? 48 : 24),
      ],
    ),
  ),
);

}
}