import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.deepPurple),
        useMaterial3: true,
      ),
      home: const MyHomePage(),
    );
  }
}

class MyHomePage extends StatelessWidget {
  const MyHomePage({super.key});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        backgroundColor: Theme.of(context).colorScheme.inversePrimary,
        title: const Text("Main page"),
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            const Padding(
              padding: EdgeInsets.all(24),
              child: TextField(
                autofocus: false,
              ),
            ),
            Text(
              FocusScope.of(context).hasFocus
                  ? 'Has focus'
                  : 'Does not have focus',
            ),
            ElevatedButton(
              onPressed: () => FocusScope.of(context).unfocus(),
              child: const Text("Clear focus"),
            ),
            ElevatedButton(
              onPressed: () {
                Navigator.push(
                  context,
                  MaterialPageRoute(builder: (context) => const SecondPage()),
                );
              },
              child: const Text("Open page"),
            ),
            ElevatedButton(
              child: const Text("Open dialog"),
              onPressed: () {
                showDialog(
                  context: context,
                  builder: (context) {
                    return AlertDialog(
                      title: const Text("Dialog"),
                      content: const Text("This is a dialog"),
                      actions: [
                        TextButton(
                          onPressed: () {
                            Navigator.pop(context);
                          },
                          child: const Text("Close"),
                        ),
                      ],
                    );
                  },
                );
              },
            ),
          ],
        ),
      ),
    );
  }
}

class SecondPage extends StatelessWidget {
  const SecondPage({Key? key}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
          title: const Text("Second page"),
          leading: IconButton(
            onPressed: () {
              Navigator.pop(context);
            },
            icon: const Icon(Icons.arrow_back),
          )),
      body: const Center(
        child: Text("This is the second page!"),
      ),
    );
  }
}