upstream-flutter-samples/cupertino_gallery/lib/widgets/context_menu_page.dart

import 'package:flutter/cupertino.dart';

class ContextMenuPage extends StatelessWidget {
  const ContextMenuPage({super.key});

  @override
  Widget build(BuildContext context) {
    return CupertinoPageScaffold(
      navigationBar: const CupertinoNavigationBar(middle: Text('Context Menu')),
      child: Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Text('Long press to activate context menu:'),
            SizedBox(height: 16),
            SizedBox(
              width: 100,
              height: 100,
              child: CupertinoContextMenu(
                actions: <Widget>[
                  CupertinoContextMenuAction(
                    child: const Text('Action one'),
                    onPressed: () {
                      Navigator.pop(context);
                    },
                  ),
                  CupertinoContextMenuAction(
                    child: const Text('Action two'),
                    onPressed: () {
                      Navigator.pop(context);
                    },
                  ),
                ],
                child: Container(color: CupertinoColors.activeBlue),
              ),
            ),
          ],
        ),
      ),
    );
  }
}