在Flutter中将构造函数作为参数传递

import 'package:flutter/material.dart';

class MyButton extends StatelessWidget {
  final String text;
  final VoidCallback onPressed;

  MyButton({required this.text, required this.onPressed});

  @override
  Widget build(BuildContext context) {
    return ElevatedButton(
      onPressed: onPressed,
      child: Text(text),
    );
  }
}

class MyApp extends StatelessWidget {
  void _handleButtonPress() {
    print('Button pressed!');
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('Button Demo'),
        ),
        body: Center(
          child: MyButton(
            text: 'Click me',
            onPressed: _handleButtonPress,
          ),
        ),
      ),
    );
  }
}

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