new Day3 (위젯 사이에 공간을 주는 방법들)

방법 1 : 값을 정해서 넣어 줘야 한다.
방법 2 , 방법 3 : 결과가 똑 같다.
방법 4 : spaceAround, spaceBetween, spaceEvenly 등등의 값이 있음.

 

import 'package:flutter/material.dart';

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

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

  @override
  Widget build(BuildContext context) {
    return const MaterialApp(
      title: 'sample',
      home: MyHome(),
    );
  }
}

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

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('space between'),),
      backgroundColor: Colors.grey,
      body:Center(
        child:  Row(
          mainAxisAlignment: MainAxisAlignment.spaceBetween, // 방법 4 :
          children: const <Widget>[
            MyWidget(color: Colors.red,),

            // SizedBox(height: 10), // 방법 1 : 값을 정해서 넣어 줘야 한다.
            Spacer(),  //방법 2 : 자동계산
            // Expanded(child: SizedBox.shrink()), // 방법 3 : 방법2와 같은 음


            MyWidget(color: Colors.yellow),
            MyWidget(color: Colors.green),
            MyWidget(color: Colors.blue),
            MyWidget(color: Colors.deepPurple),
          ],
        )
      )
    );
  }
}

class MyWidget extends StatelessWidget {
  final Color color;
  const MyWidget({Key? key, required this.color}) : super(key: key);

  @override
  Widget build(BuildContext context) {
    return Container(
      height: 10,
      width: 100,
      color: color,
    );
  }
}