| // 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 [TextEditingController]. |
| |
| void main() => runApp(const TextEditingControllerExampleApp()); |
| |
| class TextEditingControllerExampleApp extends StatelessWidget { |
| const TextEditingControllerExampleApp({super.key}); |
| |
| @override |
| Widget build(BuildContext context) { |
| return const MaterialApp( |
| home: TextEditingControllerExample(), |
| ); |
| } |
| } |
| |
| class TextEditingControllerExample extends StatefulWidget { |
| const TextEditingControllerExample({super.key}); |
| |
| @override |
| State<TextEditingControllerExample> createState() => _TextEditingControllerExampleState(); |
| } |
| |
| class _TextEditingControllerExampleState extends State<TextEditingControllerExample> { |
| final TextEditingController _controller = TextEditingController(); |
| |
| @override |
| void initState() { |
| super.initState(); |
| _controller.addListener(() { |
| final String text = _controller.text.toLowerCase(); |
| _controller.value = _controller.value.copyWith( |
| text: text, |
| selection: TextSelection(baseOffset: text.length, extentOffset: text.length), |
| composing: TextRange.empty, |
| ); |
| }); |
| } |
| |
| @override |
| void dispose() { |
| _controller.dispose(); |
| super.dispose(); |
| } |
| |
| @override |
| Widget build(BuildContext context) { |
| return Scaffold( |
| body: Container( |
| alignment: Alignment.center, |
| padding: const EdgeInsets.all(6), |
| child: TextFormField( |
| controller: _controller, |
| decoration: const InputDecoration(border: OutlineInputBorder()), |
| ), |
| ), |
| ); |
| } |
| } |