import 'package:flutter/material.dart';

const Color darkBlue = Color.fromARGB(255, 18, 32, 47);

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

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      theme: ThemeData.dark().copyWith(
        scaffoldBackgroundColor: darkBlue,
      ),
      debugShowCheckedModeBanner: false,
      home: Scaffold(
        body: Center(
          child: MyWidget(),
        ),
      ),
    );
  }
}

class MyWidget extends StatefulWidget {
  @override
  State<MyWidget> createState() => _MyWidgetState();
}

class _MyWidgetState extends State<MyWidget> {
  final GlobalKey<FormState> _formKey = GlobalKey<FormState>();

  final TextEditingController controller = TextEditingController();

  @override
  Widget build(BuildContext context) {
    return Form(
    
    key: _formKey,
        autovalidateMode: AutovalidateMode.onUserInteraction,
      child: Column(
      children: [
        TextFormField(
          controller: controller,
        ),
        ElevatedButton(
          onPressed: () {
            
            FocusScope.of(context).requestFocus(FocusNode()); 
            _formKey.currentState?.reset();
          },
        child: const Text("submit"),
        ), 
      ],)
    );
  }
}