import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  // This widget is the root of your application.
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        // This is the theme of your application.
        //
        // Try running your application with "flutter run". You'll see the
        // application has a blue toolbar. Then, without quitting the app, try
        // changing the primarySwatch below to Colors.green and then invoke
        // "hot reload" (press "r" in the console where you ran "flutter run",
        // or simply save your changes to "hot reload" in a Flutter IDE).
        // Notice that the counter didn't reset back to zero; the application
        // is not restarted.
        primarySwatch: Colors.blue,
      ),
      home: const MyHomePage(title: 'Flutter Demo Home Page'),
    );
  }
}

class MyHomePage extends StatefulWidget {
  const MyHomePage({Key? key, required this.title}) : super(key: key);

  // This widget is the home page of your application. It is stateful, meaning
  // that it has a State object (defined below) that contains fields that affect
  // how it looks.

  // This class is the configuration for the state. It holds the values (in this
  // case the title) provided by the parent (in this case the App widget) and
  // used by the build method of the State. Fields in a Widget subclass are
  // always marked "final".

  final String title;

  @override
  State<MyHomePage> createState() => _MyHomePageState();
}

class _MyHomePageState extends State<MyHomePage> {
  final _form_key = GlobalKey<FormState>();

  void unfocusWidgets(BuildContext context) {
    FocusScope.of(context).unfocus();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        centerTitle: true,
        title: const Text('Focus Bug'),
      ),

      body: Listener( // Used to dismiss the keyboard if the user taps elsewhere on the screen.
        onPointerDown: (event) {
          unfocusWidgets(context);
        },
        child: SafeArea(
          child: SizedBox.expand(
            child: Container(
              color: Colors.white,
              padding: const EdgeInsets.all(10.0),
              child: Align(
                alignment: Alignment.topCenter,
                child: Form(
                  key: _form_key,
                  child: TextFormField(
                    initialValue: 'On iOS, tap this text field in various places. Eventually the keyboard will no longer show up and interacting with this widget will not work.',
                    keyboardType: TextInputType.text,
                    autofocus: false,
                    maxLines: 3,
                    onChanged: (value) { },
                  ),
                ),
              )
            )
          ),
        ),
      ),
    );
  }
}