如何忽略某个GestureDetector小部件的触摸并检测Flutter中的外部触摸？

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: Stack(
            children: [
              GestureDetector(
                onTap: () {
                  print('Inner GestureDetector tapped!');
                },
                child: Container(
                  width: 200,
                  height: 200,
                  color: Colors.blue,
                  child: Center(
                    child: Text(
                      'Inner GestureDetector',
                      style: TextStyle(color: Colors.white),
                    ),
                  ),
                ),
              ),
              IgnorePointer(
                ignoring: true,
                child: GestureDetector(
                  onTap: () {
                    print('Outer GestureDetector tapped!');
                  },
                  child: Container(
                    width: 300,
                    height: 300,
                    color: Colors.red,
                    child: Center(
                      child: Text(
                        'Outer GestureDetector',
                        style: TextStyle(color: Colors.white),
                      ),
                    ),
                  ),
                ),
              ),
            ],
          ),
        ),
      ),
    );
  }
}