플러터챌린지 0일차 기본문제 - 김구봉

main.dart

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 StatefulWidget {
  const MyHomePage({super.key});

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  int _counter = 0;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Hello Flutter'),
        leading: IconButton(
          onPressed: () {},
          icon: const Icon(Icons.home),
        ),
        centerTitle: true,
        actions: [
          IconButton(
            onPressed: () {},
            icon: const Icon(Icons.question_mark_rounded),
          ),
        ],
      ),
      body: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: <Widget>[
            const Text(
              'Your score',
              style: TextStyle(fontWeight: FontWeight.bold, fontSize: 30),
            ),
            Text(
              '$_counter',
              style: Theme.of(context).textTheme.headlineMedium,
            ),
            Row(
              mainAxisSize: MainAxisSize.min,
              children: [
                Button(
                  onPressed: () {
                    setState(() {
                      ++_counter;
                    });
                  },
                  text: '+',
                ),
                const SizedBox(width: 20),
                Button(
                  onPressed: () {
                    setState(() {
                      --_counter;
                    });
                  },
                  text: '-',
                ),
              ],
            )
          ],
        ),
      ),
    );
  }
}

class Button extends StatelessWidget {
  const Button({
    super.key,
    required this.text,
    required this.onPressed,
  });

  final String text;
  final void Function()? onPressed;

  @override
  Widget build(BuildContext context) {
    return ElevatedButton(
      onPressed: onPressed,
      style: const ButtonStyle(
        backgroundColor: MaterialStatePropertyAll(Colors.purple),
      ),
      child: Text(
        text,
        style: const TextStyle(color: Colors.white),
      ),
    );
  }
}