Container佈局在Flutter裏大量使用,它是一個組合Widget,內部有繪製Widget、定位Widget和尺寸Widget。Container組件常用屬性如下圖:
下面是一個Container的示例:
- 在工程下新建一個images文件夾,並放入幾張圖片如下圖:
- 打開 pubspec.yaml 配置文件添加images配置如下圖:
- 接下來編寫Container代碼如下:
import 'package:flutter/material.dart';
void main() => runApp(MyApp());
class MyApp extends StatelessWidget {
// This widget is the root of your application.
@override
Widget build(BuildContext context) {
return MaterialApp(
title: 'Container 佈局',
home: LayoutDemo(),
);
}
}
class LayoutDemo extends StatelessWidget {
@override
Widget build(BuildContext context) {
Widget container = Container(
decoration: BoxDecoration(color: Colors.grey),
child: Column(
children: <Widget>[
Expanded( // 防止內容溢出
child: new Container(
width: 150,
height: 150,
// 添加裝飾效果
decoration: new BoxDecoration(
border: new Border.all(width: 10, color: Colors.blueGrey),
borderRadius:
const BorderRadius.all(const Radius.circular(8))),
margin: const EdgeInsets.all(4.0),
child: new Image.asset('images/1.jpg'),
),
),
Expanded(
child: new Container(
width: 150,
height: 150,
decoration: new BoxDecoration(
border: new Border.all(width: 10, color: Colors.blueGrey),
borderRadius:
const BorderRadius.all(const Radius.circular(8))),
margin: const EdgeInsets.all(4.0),
child: new Image.asset(
'images/2.jpg',
),
),
),
Expanded(
child: new Container(
width: 150,
height: 150,
decoration: new BoxDecoration(
border: new Border.all(width: 10, color: Colors.blueGrey),
borderRadius:
const BorderRadius.all(const Radius.circular(8))),
margin: const EdgeInsets.all(4.0),
child: new Image.asset('images/3.jpg'),
),
),
Expanded(
child: new Container(
width: 150,
height: 150,
decoration: new BoxDecoration(
border: new Border.all(width: 10, color: Colors.blueGrey),
borderRadius:
const BorderRadius.all(const Radius.circular(8))),
margin: const EdgeInsets.all(4.0),
child: new Image.asset('images/4.jpg'),
),
)
],
),
);
return new Scaffold(
appBar: AppBar(
title: Text('Container'),
),
body: container,
);
}
}
效果如下圖所示: