import 'package:flutter/material.dart';

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

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        body: Center(
          child: MenuAnchor(
            builder: (BuildContext context, MenuController controller, Widget? child) => TextButton(
              onPressed: () {
                controller.isOpen ? controller.close() : controller.open();
              },
              child: const Text('Press here'),
            ),
            menuChildren: <Widget>[
              SubmenuButton(

                menuChildren: <Widget>[
                  MenuItemButton(
                    onPressed: () {},
                    child: const Text('Menu item'),
                  ),
                ],
                child: const Text('Submenu'),
              ),
            ],
          ),
        ),
      ),
    );
  }
}