如何检测flutter中的用户截图动作？

dependencies:
  screenshot: ^0.3.0

import 'package:screenshot/screenshot.dart';

class MyScreen extends StatefulWidget {
  @override
  _MyScreenState createState() => _MyScreenState();
}

class _MyScreenState extends State<MyScreen> {
  ScreenshotController screenshotController = ScreenshotController();

  @override
  void initState() {
    super.initState();
    screenshotController.addListener(() {
      // 用户进行了截图操作
      // 在这里可以执行相应的逻辑处理
      print('用户进行了截图操作');
    });
  }

  @override
  Widget build(BuildContext context) {
    return Screenshot(
      controller: screenshotController,
      child: // 页面或组件的内容
    );
  }
}