ConstrainedBox 限定最大最小宽高布局

main.dart

import 'package:flutter/material.dart';

void main() {
  runApp(MaterialApp(
    title: "ConstrainedBox限定最大最小宽高布局",
    home: LayoutDemo(),
  ));
}

class LayoutDemo extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text("ConstrainedBox限定最大最小宽高布局"),
      ),
      body: ConstrainedBox(
//        设置限定值
        constraints: BoxConstraints(
          minWidth: 150.0,
          minHeight: 220.0,
          maxWidth: 220.0,
          maxHeight: 220.0,
        ),
//        子容器
        child: Container(
          width: 300.0,
          height: 300.0,
          color: Colors.green,
        ),
      ),
    );
  }
}