flutter/examples/api/lib/material/popup_menu/popup_menu.0.dart

// Copyright 2014 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import 'package:flutter/material.dart';

/// Flutter code sample for [PopupMenuButton].

// This is the type used by the popup menu below.
enum SampleItem { itemOne, itemTwo, itemThree }

void main() => runApp(const PopupMenuApp());

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

  @override
  Widget build(BuildContext context) {
    return const MaterialApp(
      home: PopupMenuExample(),
    );
  }
}

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

  @override
  State<PopupMenuExample> createState() => _PopupMenuExampleState();
}

class _PopupMenuExampleState extends State<PopupMenuExample> {
  SampleItem? selectedItem;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('PopupMenuButton')),
      body: Center(
        child: PopupMenuButton<SampleItem>(
          initialValue: selectedItem,
          onSelected: (SampleItem item) {
            setState(() {
              selectedItem = item;
            });
          },
          itemBuilder: (BuildContext context) => <PopupMenuEntry<SampleItem>>[
            const PopupMenuItem<SampleItem>(
              value: SampleItem.itemOne,
              child: Text('Item 1'),
            ),
            const PopupMenuItem<SampleItem>(
              value: SampleItem.itemTwo,
              child: Text('Item 2'),
            ),
            const PopupMenuItem<SampleItem>(
              value: SampleItem.itemThree,
              child: Text('Item 3'),
            ),
          ],
        ),
      ),
    );
  }
}