Flutter 检测内容溢出并剪辑它

你不应该用ClipRect来实现你的目标.请try 将值为Clip.antiAlias的clipBehavior参数添加到您的Stack小部件.

import 'package:flutter/material.dart';

void main() => runApp(ContentOverflowDetectionApp());

class ContentOverflowDetectionApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text("Overflow detection"),
        ),
        body: Stack(
          fit: StackFit.expand,
          clipBehavior: Clip.antiAlias,
          children: [
            Positioned(
              top: 0,
              child: Column(
                children: [
                  Container(
                    width: 300,
                    height: 400,
                    color: Colors.green[200],
                    child: Text('first widget'),
                  ),
                  Container(
                    width: 350,
                    height: 350,
                    color: Colors.yellow[200],
                    child: Text('overflowed widget'),
                  ),
                ],
              ),
            ),
            Positioned(
              child: Align(
                alignment: FractionalOffset.bottomCenter,
                child: Text("SHOW THIS TEXT ONLY IF CONTENT HAS OVERFLOWED."),
              ),
            ),
          ],
        ),
      ),
    );
  }
}

这个解决方案只修复了一个剪辑.

How to get height of a Widget?给出了如何判断小部件高度和添加带有溢出消息的文本的答案