flutter :如何在单击小部件内按钮后将该小部件更改为另一个小部件

import 'package:flutter/material.dart';

class MyWidget extends StatefulWidget {
  @override
  _MyWidgetState createState() => _MyWidgetState();
}

class _MyWidgetState extends State<MyWidget> {
  bool isButtonClicked = false;

  void _handleButtonClick() {
    setState(() {
      isButtonClicked = true;
    });
  }

  @override
  Widget build(BuildContext context) {
    return isButtonClicked ? AnotherWidget() : InitialWidget(_handleButtonClick);
  }
}

class InitialWidget extends StatelessWidget {
  final VoidCallback onPressed;

  InitialWidget(this.onPressed);

  @override
  Widget build(BuildContext context) {
    return RaisedButton(
      child: Text('Click me'),
      onPressed: onPressed,
    );
  }
}

class AnotherWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Text('Another widget');
  }
}