import 'package:flutter/material.dart';

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

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

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        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);

  final String title;

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

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

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Center(
        child: SingleChildScrollView(
          padding: const EdgeInsets.all(20),
          child: Column(
            children: [
              const Text('has issue onUserInteraction (wraped with Form)'),
              Form(
                key: _formKey,
                autovalidateMode: AutovalidateMode.onUserInteraction,
                child: Column(
                  children: [
                    TextFormField(
                      decoration: const InputDecoration(
                        hintText: 'Enter your Name',
                      ),
                      validator: (val) {
                        return val!.length < 4 ? 'Not valid' : null;
                      },
                    ),
                    const SizedBox(height: 20),
                    TextFormField(
                      decoration: const InputDecoration(
                        hintText: 'Enter your email Id',
                      ),
                      validator: (val) {
                        return val!.length < 4 ? 'email not valid' : null;
                      },
                    ),
                    const SizedBox(height: 20),
                    TextFormField(
                      decoration: const InputDecoration(
                        hintText: 'Enter your password',
                      ),
                      obscureText: true,
                      validator: (val) {
                        return val!.length < 4 ? 'password not valid' : null;
                      },
                    ),
                  ],
                ),
              ),
              const SizedBox(height: 40),
              const Text('Working fine onUserInteraction (wraped without Form)'),
              TextFormField(
                decoration: const InputDecoration(
                  hintText: 'Enter your Name',
                ),
                autovalidateMode: AutovalidateMode.onUserInteraction,
                validator: (val) {
                  return val!.length < 4 ? 'Not valid' : null;
                },
              ),
              const SizedBox(height: 20),
              TextFormField(
                decoration: const InputDecoration(
                  hintText: 'Enter your email Id',
                ),
                autovalidateMode: AutovalidateMode.onUserInteraction,
                validator: (val) {
                  return val!.length < 4 ? 'email not valid' : null;
                },
              ),
              const SizedBox(height: 20),
              TextFormField(
                decoration: const InputDecoration(
                  hintText: 'Enter your password',
                ),
                autovalidateMode: AutovalidateMode.onUserInteraction,
                obscureText: true,
                validator: (val) {
                  return val!.length < 4 ? 'password not valid' : null;
                },
              ),
            ],
          ),
        ),
      ),
    );
  }
}