Flutter:如何防止触摸事件传给孩子？

import 'package:flutter/material.dart';

void main() {
  runApp(MyApp());
}

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(title: Text('IgnorePointer Example')),
        body: Center(
          child: IgnorePointer(
            child: Container(
              color: Colors.grey[300],
              width: 200,
              height: 200,
              child: Center(child: Text('This is ignored')),
            ),
          ),
        ),
      ),
    );
  }
}