| // 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 [InputDecorator]. |
| |
| import 'package:flutter/material.dart'; |
| |
| void main() => runApp(const MyApp()); |
| |
| class MyApp extends StatelessWidget { |
| const MyApp({super.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 Center( |
| child: InputDecoratorExample(), |
| ), |
| ), |
| ); |
| } |
| } |
| |
| class InputDecoratorExample extends StatelessWidget { |
| const InputDecoratorExample({super.key}); |
| |
| @override |
| Widget build(BuildContext context) { |
| return TextFormField( |
| decoration: InputDecoration( |
| border: const OutlineInputBorder(), |
| labelText: 'Name', |
| // The MaterialStateProperty's value is a text style that is orange |
| // by default, but the theme's error color if the input decorator |
| // is in its error state. |
| floatingLabelStyle: MaterialStateTextStyle.resolveWith( |
| (Set<MaterialState> states) { |
| final Color color = states.contains(MaterialState.error) ? Theme.of(context).colorScheme.error: Colors.orange; |
| return TextStyle(color: color, letterSpacing: 1.3); |
| } |
| ), |
| ), |
| validator: (String? value) { |
| if (value == null || value == '') { |
| return 'Enter name'; |
| } |
| return null; |
| }, |
| autovalidateMode: AutovalidateMode.always, |
| ); |
| } |
| } |