import 'package:flutter/widgets.dart';

// Container - A convenience widget combining common painting, positioning, and sizing
Container(
  padding: EdgeInsets.all(16.0),
  margin: EdgeInsets.symmetric(horizontal: 8.0),
  decoration: BoxDecoration(
    color: Colors.white,
    borderRadius: BorderRadius.circular(8.0),
    boxShadow: [BoxShadow(color: Colors.grey, blurRadius: 4.0)],
  ),
  child: Text('Hello Flutter'),
)

// Text - Display text with styling
Text(
  'Hello World',
  style: TextStyle(
    fontSize: 24.0,
    fontWeight: FontWeight.bold,
    color: Colors.blue,
  ),
)

// Row & Column - Layout widgets
Row(
  mainAxisAlignment: MainAxisAlignment.spaceBetween,
  crossAxisAlignment: CrossAxisAlignment.center,
  children: [
    Icon(Icons.star),
    Text('Rating'),
    Text('4.5'),
  ],
)

Column(
  mainAxisAlignment: MainAxisAlignment.center,
  children: [
    Text('Title'),
    Text('Subtitle'),
  ],
)

// Stack - Overlay widgets
Stack(
  children: [
    Container(color: Colors.blue),
    Positioned(
      top: 10,
      left: 10,
      child: Text('Overlay'),
    ),
  ],
)

// Padding - Add padding around a widget
Padding(
  padding: EdgeInsets.all(16.0),
  child: Text('Padded text'),
)

// Center - Center a widget
Center(child: Text('Centered'))

// Align - Align widget within parent
Align(
  alignment: Alignment.topRight,
  child: Icon(Icons.close),
)

// SizedBox - Fixed size box or spacing
SizedBox(
  width: 100,
  height: 50,
  child: ElevatedButton(
    onPressed: () {},
    child: Text('Button'),
  ),
)

// Flexible & Expanded - Responsive sizing
Row(
  children: [
    Flexible(
      flex: 2,
      child: Container(color: Colors.red),
    ),
    Expanded(
      flex: 3,
      child: Container(color: Colors.blue),
    ),
  ],
)

// Wrap - Flow layout that wraps children
Wrap(
  spacing: 8.0,
  runSpacing: 4.0,
  children: [
    Chip(label: Text('Tag 1')),
    Chip(label: Text('Tag 2')),
    Chip(label: Text('Tag 3')),
  ],
)

// ListView - Scrollable list
ListView(
  children: [
    ListTile(title: Text('Item 1')),
    ListTile(title: Text('Item 2')),
    ListTile(title: Text('Item 3')),
  ],
)

// ListView.builder - Efficient for large lists
ListView.builder(
  itemCount: items.length,
  itemBuilder: (context, index) {
    return ListTile(title: Text(items[index]));
  },
)

// ListView.separated - With separators
ListView.separated(
  itemCount: items.length,
  itemBuilder: (context, index) => ListTile(title: Text(items[index])),
  separatorBuilder: (context, index) => Divider(),
)

// GridView - Grid layout
GridView.count(
  crossAxisCount: 2,
  crossAxisSpacing: 10,
  mainAxisSpacing: 10,
  children: [
    Card(child: Center(child: Text('1'))),
    Card(child: Center(child: Text('2'))),
    Card(child: Center(child: Text('3'))),
    Card(child: Center(child: Text('4'))),
  ],
)

// GridView.builder - Efficient grid
GridView.builder(
  gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
    crossAxisCount: 3,
    crossAxisSpacing: 10,
    mainAxisSpacing: 10,
  ),
  itemCount: items.length,
  itemBuilder: (context, index) {
    return Card(child: Center(child: Text('Item $index')));
  },
)

import 'package:flutter/material.dart';

// Scaffold - Basic material app structure
Scaffold(
  appBar: AppBar(
    title: Text('My App'),
    actions: [
      IconButton(icon: Icon(Icons.search), onPressed: () {}),
      IconButton(icon: Icon(Icons.more_vert), onPressed: () {}),
    ],
  ),
  body: Center(child: Text('Content')),
  floatingActionButton: FloatingActionButton(
    onPressed: () {},
    child: Icon(Icons.add),
  ),
  drawer: Drawer(
    child: ListView(
      children: [
        DrawerHeader(child: Text('Header')),
        ListTile(title: Text('Item 1')),
        ListTile(title: Text('Item 2')),
      ],
    ),
  ),
  bottomNavigationBar: BottomNavigationBar(
    items: [
      BottomNavigationBarItem(icon: Icon(Icons.home), label: 'Home'),
      BottomNavigationBarItem(icon: Icon(Icons.search), label: 'Search'),
      BottomNavigationBarItem(icon: Icon(Icons.person), label: 'Profile'),
    ],
  ),
)

// Card - Material design card
Card(
  elevation: 4.0,
  margin: EdgeInsets.all(8.0),
  child: Padding(
    padding: EdgeInsets.all(16.0),
    child: Column(
      children: [
        Text('Card Title', style: Theme.of(context).textTheme.headlineSmall),
        SizedBox(height: 8),
        Text('Card content goes here'),
      ],
    ),
  ),
)

// Buttons
ElevatedButton(
  onPressed: () {},
  child: Text('Elevated Button'),
)

TextButton(
  onPressed: () {},
  child: Text('Text Button'),
)

OutlinedButton(
  onPressed: () {},
  child: Text('Outlined Button'),
)

IconButton(
  icon: Icon(Icons.favorite),
  onPressed: () {},
)

FloatingActionButton(
  onPressed: () {},
  child: Icon(Icons.add),
)

// TextField - Text input
TextField(
  decoration: InputDecoration(
    labelText: 'Enter your name',
    hintText: 'John Doe',
    prefixIcon: Icon(Icons.person),
    border: OutlineInputBorder(),
  ),
  onChanged: (value) {
    print('Text changed: $value');
  },
)

// Form with validation
final _formKey = GlobalKey<FormState>();

Form(
  key: _formKey,
  child: Column(
    children: [
      TextFormField(
        decoration: InputDecoration(labelText: 'Email'),
        validator: (value) {
          if (value == null || value.isEmpty) {
            return 'Please enter email';
          }
          if (!value.contains('@')) {
            return 'Please enter valid email';
          }
          return null;
        },
      ),
      TextFormField(
        decoration: InputDecoration(labelText: 'Password'),
        obscureText: true,
        validator: (value) {
          if (value == null || value.length < 6) {
            return 'Password must be at least 6 characters';
          }
          return null;
        },
      ),
      ElevatedButton(
        onPressed: () {
          if (_formKey.currentState!.validate()) {
            // Process form
          }
        },
        child: Text('Submit'),
      ),
    ],
  ),
)

// Checkbox
Checkbox(
  value: isChecked,
  onChanged: (bool? value) {
    setState(() {
      isChecked = value ?? false;
    });
  },
)

// Radio buttons
Column(
  children: [
    RadioListTile<String>(
      title: Text('Option 1'),
      value: 'option1',
      groupValue: selectedOption,
      onChanged: (value) {
        setState(() {
          selectedOption = value!;
        });
      },
    ),
    RadioListTile<String>(
      title: Text('Option 2'),
      value: 'option2',
      groupValue: selectedOption,
      onChanged: (value) {
        setState(() {
          selectedOption = value!;
        });
      },
    ),
  ],
)

// Switch
Switch(
  value: isSwitched,
  onChanged: (value) {
    setState(() {
      isSwitched = value;
    });
  },
)

// Slider
Slider(
  value: currentValue,
  min: 0,
  max: 100,
  divisions: 10,
  label: currentValue.round().toString(),
  onChanged: (value) {
    setState(() {
      currentValue = value;
    });
  },
)

// AlertDialog
showDialog(
  context: context,
  builder: (context) => AlertDialog(
    title: Text('Confirm Action'),
    content: Text('Are you sure you want to proceed?'),
    actions: [
      TextButton(
        onPressed: () => Navigator.pop(context),
        child: Text('Cancel'),
      ),
      TextButton(
        onPressed: () {
          // Perform action
          Navigator.pop(context);
        },
        child: Text('Confirm'),
      ),
    ],
  ),
)

// SnackBar
ScaffoldMessenger.of(context).showSnackBar(
  SnackBar(
    content: Text('Action completed'),
    action: SnackBarAction(
      label: 'Undo',
      onPressed: () {
        // Undo action
      },
    ),
    duration: Duration(seconds: 3),
  ),
)

// Bottom Sheet
showModalBottomSheet(
  context: context,
  builder: (context) {
    return Container(
      height: 200,
      child: Column(
        children: [
          ListTile(
            leading: Icon(Icons.share),
            title: Text('Share'),
            onTap: () {},
          ),
          ListTile(
            leading: Icon(Icons.link),
            title: Text('Copy link'),
            onTap: () {},
          ),
        ],
      ),
    );
  },
)

// Date Picker
showDatePicker(
  context: context,
  initialDate: DateTime.now(),
  firstDate: DateTime(2000),
  lastDate: DateTime(2100),
).then((date) {
  if (date != null) {
    print('Selected date: $date');
  }
});

// Time Picker
showTimePicker(
  context: context,
  initialTime: TimeOfDay.now(),
).then((time) {
  if (time != null) {
    print('Selected time: $time');
  }
});

import 'package:flutter/cupertino.dart';

// CupertinoApp - iOS-style app
CupertinoApp(
  home: CupertinoPageScaffold(
    navigationBar: CupertinoNavigationBar(
      middle: Text('iOS App'),
    ),
    child: Center(child: Text('Content')),
  ),
)

// Cupertino Buttons
CupertinoButton(
  child: Text('iOS Button'),
  onPressed: () {},
)

CupertinoButton.filled(
  child: Text('Filled Button'),
  onPressed: () {},
)

// Cupertino Dialog
showCupertinoDialog(
  context: context,
  builder: (context) => CupertinoAlertDialog(
    title: Text('Alert'),
    content: Text('This is an iOS-style alert'),
    actions: [
      CupertinoDialogAction(
        child: Text('Cancel'),
        onPressed: () => Navigator.pop(context),
      ),
      CupertinoDialogAction(
        isDestructiveAction: true,
        child: Text('Delete'),
        onPressed: () {
          // Delete action
          Navigator.pop(context);
        },
      ),
    ],
  ),
)

// Cupertino Picker
CupertinoPicker(
  itemExtent: 32.0,
  onSelectedItemChanged: (index) {
    print('Selected: $index');
  },
  children: [
    Text('Option 1'),
    Text('Option 2'),
    Text('Option 3'),
  ],
)

// Cupertino Sliver Navigation Bar
CupertinoPageScaffold(
  child: CustomScrollView(
    slivers: [
      CupertinoSliverNavigationBar(
        largeTitle: Text('Large Title'),
      ),
      SliverList(
        delegate: SliverChildBuilderDelegate(
          (context, index) => ListTile(title: Text('Item $index')),
          childCount: 50,
        ),
      ),
    ],
  ),
)

// Basic navigation
Navigator.push(
  context,
  MaterialPageRoute(builder: (context) => SecondScreen()),
);

// Pop back
Navigator.pop(context);

// Named routes
MaterialApp(
  initialRoute: '/',
  routes: {
    '/': (context) => HomeScreen(),
    '/details': (context) => DetailsScreen(),
    '/settings': (context) => SettingsScreen(),
  },
);

// Navigate to named route
Navigator.pushNamed(context, '/details');

// Pass arguments
Navigator.pushNamed(
  context,
  '/details',
  arguments: {'id': 123, 'title': 'Item'},
);

// Receive arguments
class DetailsScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final args = ModalRoute.of(context)!.settings.arguments as Map;
    return Scaffold(
      appBar: AppBar(title: Text(args['title'])),
      body: Text('ID: ${args['id']}'),
    );
  }
}

// Replace route
Navigator.pushReplacement(
  context,
  MaterialPageRoute(builder: (context) => NewScreen()),
);

// Remove all and push
Navigator.pushAndRemoveUntil(
  context,
  MaterialPageRoute(builder: (context) => HomeScreen()),
  (route) => false,
);

// Return data from screen
// On second screen
Navigator.pop(context, 'Result data');

// On first screen
final result = await Navigator.push(
  context,
  MaterialPageRoute(builder: (context) => SecondScreen()),
);
print('Result: $result');