【笔记】Flutter 的 Align 对齐组件

1 year ago

source link: https://loli.fj.cn/2023/06/25/Flutter%E7%9A%84Align%E5%AF%B9%E9%BD%90%E7%BB%84%E4%BB%B6/
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Flutter 的 Align 对齐组件学习笔记

Align 对齐组件

alignment：子元素的位置

Alignment.topLeft：左上
Alignment.topCenter：上
Alignment.topRight：右上
Alignment.centerLeft：左
Alignment.center：中
Alignment.centerRight：右
Alignment.bottomLeft：左下
Alignment.bottomCenter：下
Alignment.bottomRight：右下

import 'package:flutter/material.dart';

void main() {
  runApp(MaterialApp(
    home: Scaffold(
      appBar: AppBar(
        title: const Text("文本内容"),
      ),
      body: const App(),
    ),
  ));
}

class App extends StatelessWidget {
  const App({super.key});

@override
  Widget build(BuildContext context) {
    return Container(
      width: 200,
      height: 200,
      color: Colors.red,
      child: Align(
        alignment: Alignment.center,
        child: Container(
          width: 100,
          height: 100,
          color: Colors.yellow,
        ),
      ),
    );
  }
}

自定义子元素的位置

通过给定 x 轴和 y 轴的坐标，实现自定义子元素的位置
- x 轴和 y 轴的取值范围为 [0,1]
- 左上角为原点，x 轴向右为正方向，y 轴向下为正方向

import 'package:flutter/material.dart';

void main() {
  runApp(MaterialApp(
    home: Scaffold(
      appBar: AppBar(
        title: const Text("文本内容"),
      ),
      body: const App(),
    ),
  ));
}

class App extends StatelessWidget {
  const App({super.key});

@override
  Widget build(BuildContext context) {
    return Container(
      width: 200,
      height: 200,
      color: Colors.red,
      child: Align(
        alignment: const Alignment(1, 1),
        child: Container(
          width: 100,
          height: 100,
          color: Colors.yellow,
        ),
      ),
    );
  }
}