flutter片段如何提取小部件？

// 提取后的小部件类
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),
    );
  }
}

// 原始代码中的使用示例
class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('My App'),
      ),
      body: Center(
        child: MyButton(
          text: 'Click Me',
          onPressed: () {
            // 按钮点击事件处理
          },
        ),
      ),
    );
  }
}