| // 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 [DropdownButton.style]. |
| |
| void main() => runApp(const DropdownButtonApp()); |
| |
| class DropdownButtonApp extends StatelessWidget { |
| const DropdownButtonApp({super.key}); |
| |
| @override |
| Widget build(BuildContext context) { |
| return MaterialApp( |
| home: Scaffold( |
| appBar: AppBar(title: const Text('DropdownButton Sample')), |
| body: const DropdownButtonExample(), |
| ), |
| ); |
| } |
| } |
| |
| class DropdownButtonExample extends StatefulWidget { |
| const DropdownButtonExample({super.key}); |
| |
| @override |
| State<DropdownButtonExample> createState() => _DropdownButtonExampleState(); |
| } |
| |
| class _DropdownButtonExampleState extends State<DropdownButtonExample> { |
| List<String> options = <String>['One', 'Two', 'Three', 'Four']; |
| String dropdownValue = 'One'; |
| |
| @override |
| Widget build(BuildContext context) { |
| return Container( |
| alignment: Alignment.center, |
| color: Colors.blue, |
| child: DropdownButton<String>( |
| value: dropdownValue, |
| onChanged: (String? value) { |
| // This is called when the user selects an item. |
| setState(() { |
| dropdownValue = value!; |
| }); |
| }, |
| style: const TextStyle(color: Colors.blue), |
| selectedItemBuilder: (BuildContext context) { |
| // This is the widget that will be shown when you select an item. |
| // Here custom text style, alignment and layout size can be applied |
| // to selected item string. |
| return options.map((String value) { |
| return Align( |
| alignment: Alignment.centerLeft, |
| child: Text( |
| dropdownValue, |
| style: const TextStyle(color: Colors.white), |
| ), |
| ); |
| }).toList(); |
| }, |
| items: options.map<DropdownMenuItem<String>>((String value) { |
| return DropdownMenuItem<String>( |
| value: value, |
| child: Text(value), |
| ); |
| }).toList(), |
| ), |
| ); |
| } |
| } |