RawKeyboardListener未在Flutter web中触发任何事件

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        body: Center(
          child: RawKeyboardListener(
            focusNode: FocusNode(),
            onKey: (RawKeyEvent event) {
              if (event is RawKeyDownEvent) {
                // 处理按键按下事件
                print('Key down: ${event.logicalKey}');
              } else if (event is RawKeyUpEvent) {
                // 处理按键释放事件
                print('Key up: ${event.logicalKey}');
              }
            },
            child: Container(
              width: 200,
              height: 200,
              color: Colors.blue,
              child: Text(
                'Press any key',
                style: TextStyle(color: Colors.white, fontSize: 20),
              ),
            ),
          ),
        ),
      ),
    );
  }
}