| // 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. |
| |
| // Flutter code sample for DropdownButton.selectedItemBuilder |
| |
| import 'package:flutter/material.dart'; |
| |
| void main() => runApp(const MyApp()); |
| |
| class MyApp extends StatelessWidget { |
| const MyApp({Key? key}) : super(key: key); |
| |
| static const String _title = 'Flutter Code Sample'; |
| |
| @override |
| Widget build(BuildContext context) { |
| return MaterialApp( |
| title: _title, |
| home: Scaffold( |
| appBar: AppBar(title: const Text(_title)), |
| body: const MyStatefulWidget(), |
| ), |
| ); |
| } |
| } |
| |
| class MyStatefulWidget extends StatefulWidget { |
| const MyStatefulWidget({Key? key}) : super(key: key); |
| |
| @override |
| State<MyStatefulWidget> createState() => _MyStatefulWidgetState(); |
| } |
| |
| class _MyStatefulWidgetState extends State<MyStatefulWidget> { |
| final List<String> items = <String>['1', '2', '3']; |
| String selectedItem = '1'; |
| |
| @override |
| Widget build(BuildContext context) { |
| return Padding( |
| padding: const EdgeInsets.symmetric(horizontal: 12.0), |
| child: DropdownButton<String>( |
| value: selectedItem, |
| onChanged: (String? string) => setState(() => selectedItem = string!), |
| selectedItemBuilder: (BuildContext context) { |
| return items.map<Widget>((String item) { |
| return Text(item); |
| }).toList(); |
| }, |
| items: items.map((String item) { |
| return DropdownMenuItem<String>( |
| value: item, |
| child: Text('Log $item'), |
| ); |
| }).toList(), |
| ), |
| ); |
| } |
| } |