| // 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 TextEditingController |
| |
| 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 const MaterialApp( |
| title: _title, |
| home: MyStatefulWidget(), |
| ); |
| } |
| } |
| |
| class MyStatefulWidget extends StatefulWidget { |
| const MyStatefulWidget({super.key}); |
| |
| @override |
| State<MyStatefulWidget> createState() => _MyStatefulWidgetState(); |
| } |
| |
| class _MyStatefulWidgetState extends State<MyStatefulWidget> { |
| 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()), |
| ), |
| ), |
| ); |
| } |
| } |