import 'package:flutter/material.dart';

void main() {
  runApp(const MaterialApp(home: MyHomePage()));
}

enum Foo { aa, bb, cc }

class MyHomePage extends StatefulWidget {
  const MyHomePage({super.key});

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  Foo? _value;

  @override
  Widget build(BuildContext context) {
    return Material(
      child: Column(
        children: [
          Text('Selected value: $_value'),
          DropdownMenu<Foo>(
            onSelected: (Foo? value) {
              setState(() {
                _value = value;
              });
            },
            dropdownMenuEntries: Foo.values
                .map<DropdownMenuEntry<Foo>>(
                  (Foo f) => DropdownMenuEntry(value: f, label: '$f'),
                )
                .toList(),
          ),
        ],
      ),
    );
  }
}