flutter/examples/api/lib/material/text_field/text_field.1.dart

// 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 [TextField].

void main() => runApp(const TextFieldExampleApp());

class TextFieldExampleApp extends StatelessWidget {
  const TextFieldExampleApp({super.key});

  @override
  Widget build(BuildContext context) {
    return const MaterialApp(home: TextFieldExample());
  }
}

class TextFieldExample extends StatefulWidget {
  const TextFieldExample({super.key});

  @override
  State<TextFieldExample> createState() => _TextFieldExampleState();
}

class _TextFieldExampleState extends State<TextFieldExample> {
  late TextEditingController _controller;

  @override
  void initState() {
    super.initState();
    _controller = TextEditingController();
  }

  @override
  void dispose() {
    _controller.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: TextField(
          controller: _controller,
          onSubmitted: (String value) async {
            await showDialog<void>(
              context: context,
              builder: (BuildContext context) {
                return AlertDialog(
                  title: const Text('Thanks!'),
                  content: Text('You typed "$value", which has length ${value.characters.length}.'),
                  actions: <Widget>[
                    TextButton(
                      onPressed: () {
                        Navigator.pop(context);
                      },
                      child: const Text('OK'),
                    ),
                  ],
                );
              },
            );
          },
        ),
      ),
    );
  }
}