[Flutter] Layout App (2)

* Layout App 이벤트 주기

 

 

 

import 'package:flutter/material.dart';
// Uncomment lines 7 and 10 to view the visual layout at runtime.
// import 'package:flutter/rendering.dart' show debugPaintSizeEnabled;

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    Widget titleSection = Container(
      padding: const EdgeInsets.all(32),
      child: Row(
        children: [
          //Expanded : UI 상 남는 공간이 없게 화면을 꽉 채우고 싶을 때,
          //특정 컴포넌트들을 폰 화면 넓이에 맞게 비율로 적용하고 싶을 때 사용
          Expanded(
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Container(
                  padding: const EdgeInsets.only(bottom: 8),
                  child: Text(
                    'Oeschinen Lake Campground',
                    style: TextStyle(
                      fontWeight: FontWeight.bold,
                    ),
                  ),
                ),
                Text(
                  'Kandersteg, Switzerland',
                  style: TextStyle(
                    color: Colors.grey[500],
                  ),
                ),
              ],
            ),
          ),
          FavoriteWidget(),
        ],
      ),
    );

    Color color = Theme
        .of(context)
        .primaryColor;

    Widget buttonSection = Container(
      child: Row(
        // MainAxisAlignment.spaceEvenly : 자식들 균등 배치
        mainAxisAlignment: MainAxisAlignment.spaceEvenly,
        children: [
          _buildButtonColumn(color, Icons.call, 'CALL'),
          _buildButtonColumn(color, Icons.near_me, 'ROUTE'),
          _buildButtonColumn(color, Icons.share, 'SHARE'),
        ],
      ),
    );

    Widget textSection = Container(
      padding: const EdgeInsets.all(32),
      child: Text(
        'Lake Oeschinen lies at the foot of the Blüemlisalp in the Bernese '
            'Alps. Situated 1,578 meters above sea level, it is one of the '
            'larger Alpine Lakes. A gondola ride from Kandersteg, followed by a '
            'half-hour walk through pastures and pine forest, leads you to the '
            'lake, which warms to 20 degrees Celsius in the summer. Activities '
            'enjoyed here include rowing, and riding the summer toboggan run.',
        softWrap: true,
      ),
    );

    return MaterialApp(
      title: 'Flutter layout demo',
      home: Scaffold(
        appBar: AppBar(
          title: Text('Flutter layout demo'),
        ),
        body: ListView(
          children: [
            Image.asset(
              'assets/images/pic1.jpg',
              width: 600,
              height: 240,
              fit: BoxFit.cover,
            ),
            titleSection,
            buttonSection,
            textSection,
          ],
        ),
      ),
    );
  }

  Column _buildButtonColumn(Color color, IconData icon, String label) {
    return Column(
      // MainAxisSize.min : 여유 공간 최소화
      // MainAxisAlignment.center : 중앙 배치
      mainAxisSize: MainAxisSize.min,
      mainAxisAlignment: MainAxisAlignment.center,
      children: [
        Icon(icon, color: color),
        Container(
          margin: const EdgeInsets.only(top: 8),
          child: Text(
            label,
            style: TextStyle(
              fontSize: 12,
              fontWeight: FontWeight.w400,
              color: color,
            ),
          ),
        ),
      ],
    );
  }
}

class FavoriteWidget extends StatefulWidget {
  @override
  FavoriteWidgetState createState() => FavoriteWidgetState();
}

class FavoriteWidgetState extends State<FavoriteWidget> {
  bool _isFavorited = true;
  int _favoriteCount = 41;

  @override
  Widget build(BuildContext context) {
    return Row(
      mainAxisSize: MainAxisSize.min,
      children: [
        Container(
          // EdgeInsets.all : 모든 면의 픽셀 여백 지정
          padding: EdgeInsets.all(0),
          child: IconButton(
            // _isFavorited가 true면 왼쪽을, false면 오른쪽을
            icon: (_isFavorited ? Icon(Icons.star) : Icon(Icons.star_border)),
            color: Colors.red[500],
            onPressed: _toggleFavorite,
          ),
        ),
        SizedBox(
          width: 18,
          child: Container(
            child: Text('$_favoriteCount'),
          ),
        ),
      ],
    );
  }

  void _toggleFavorite() {
    setState(() {
      if (_isFavorited) {
        _favoriteCount -= 1;
        _isFavorited = false;
      } else {
        _favoriteCount += 1;
        _isFavorited = true;
      }
    });
  }
}

 

 

 

 

참고 : blog.naver.com/PostView.nhn?blogId=getinthere&logNo=221665035979&parentCategoryNo=34&categoryNo=&viewDate=&isShowPopularPosts=false&from=postList

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