Flutter:如何在每个图像上放置按钮，如(x)，以取消选定的图像

import 'package:flutter/material.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text('Image with Cancel Button'),
        ),
        body: Center(
          child: ImageWithButton(),
        ),
      ),
    );
  }
}

class ImageWithButton extends StatefulWidget {
  @override
  _ImageWithButtonState createState() => _ImageWithButtonState();
}

class _ImageWithButtonState extends State<ImageWithButton> {
  bool isSelected = false;

  @override
  Widget build(BuildContext context) {
    return Stack(
      children: [
        Image.network(
          'https://example.com/image.jpg',
          width: 200,
          height: 200,
        ),
        if (isSelected)
          Positioned(
            top: 10,
            right: 10,
            child: FloatingActionButton(
              onPressed: () {
                setState(() {
                  isSelected = false;
                });
              },
              child: Icon(Icons.cancel),
            ),
          ),
      ],
    );
  }
}