import 'package:flutter/material.dart';

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

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

  @override
  Widget build(BuildContext context) {
    return const MaterialApp(
      title: 'Text Field Focus',
      home: MyCustomForm(),
    );
  }
}

// Define a custom Form widget.
class MyCustomForm extends StatelessWidget {
  const MyCustomForm({super.key});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Text Field Focus'),
      ),
      backgroundColor: Colors.amber,
      body: Padding(
        padding: const EdgeInsets.all(16.0),
        child: TextField(
          decoration: const InputDecoration(
            fillColor: Colors.white,
            filled: true
          ),
          autofocus: true,
          maxLines: 3,
          controller: TextEditingController(text: '1\n2\n3\n4\n'),
        ),
      ),// This trailing comma makes auto-formatting nicer for build methods.
    );
  }
}