Flex Expanded
Flex 組件通常與 Expanded 搭配。
Flex:
| 屬性 | 說明 |
|---|---|
| direction方向 | Axis.vertical垂直，Axis.horizontal水平 |
| mainAxisAlignment主軸 | 跟 direction 一樣 |
| crossAxisAlignment交叉軸 | direction的相反 |
| children | 子元素 |
Expanded flex屬性，等比例分配
以下direction方向是垂直，二個Expanded組件的flex為1，代表均分。
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import 'package:flutter/material.dart';
void main() {
runApp(MainPage());
}
class MainPage extends StatelessWidget {
const MainPage({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
body: Container(
width: double.infinity,
height: double.infinity,
child: Flex(
direction: Axis.vertical,
children: [
Expanded(
flex: 1,
child: Container(color: Colors.red, width: 100, height: 100)),
Expanded(
flex: 1,
child: Container(color: Colors.green, width: 100, height: 100))
],
),
),
));
}
}
以下direction為水平，二個Expanded組件占的空間為1:2，也就是紅色占1/3，綠色占2/3。
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import 'package:flutter/material.dart';
void main() {
runApp(MainPage());
}
class MainPage extends StatelessWidget {
const MainPage({Key? key}) : super(key: key);
@override
Widget build(BuildContext context) {
return MaterialApp(
home: Scaffold(
body: Container(
width: double.infinity,
height: double.infinity,
child: Flex(
direction: Axis.horizontal,
children: [
Expanded(
flex: 1,
child: Container(color: Colors.red, width: 100, height: 100)),
Expanded(
flex: 2,
child: Container(color: Colors.green, width: 100, height: 100))
],
),
),
));
}
}
