플러터 다트(dart) 빌더(Builder widget)위젯 없이 스낵바(Snack bar)(2022.04.28)

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
        title: 'Appbar',
        theme: ThemeData(primarySwatch: Colors.red),
        home: MyPage());
  }
}

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

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('snack bar'),
        centerTitle: true,
      ),
      body: MySnackBar(),
    );
  }
}

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

  @override
  Widget build(BuildContext context) {
    return Center(
      child: RaisedButton(
        child: Text('Show me'),
        onPressed: () {
          Scaffold.of(context).showSnackBar(SnackBar(
            content: Text(
              'Hellow',
              textAlign: TextAlign.center,
              style: TextStyle(color: Colors.white),
            ),
            backgroundColor: Colors.teal,
            duration: Duration(milliseconds: 1000),
          ));
        },
      ),
    );
  }
}