Auth 1

import 'package:flutter/material.dart';
import 'package:d_input/d_input.dart';
import 'package:gap/gap.dart';

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

  @override
  State<LoginPage> createState() => _LoginPageState();
}

class _LoginPageState extends State<LoginPage> {
  final _emailController = TextEditingController();
  final _passwordController = TextEditingController();

  void _executeLogin() {
    final email = _emailController.text;
    if (email == '') return _showInvalidMessage('Email must be filled');
    final password = _passwordController.text;
    if (password == '') return _showInvalidMessage('Password must be filled');

    _showInvalidMessage('Login Success');
  }

  @override
  void dispose() {
    _emailController.dispose();
    _passwordController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: SafeArea(
        child: LayoutBuilder(
          builder: (context, constraints) {
            return SingleChildScrollView(
              child: ConstrainedBox(
                constraints: BoxConstraints(minHeight: constraints.maxHeight),
                child: Padding(
                  padding: const EdgeInsets.all(30),
                  child: Column(
                    mainAxisAlignment: MainAxisAlignment.center,
                    children: [
                      CircleAvatar(
                        radius: 80,
                        child: Icon(Icons.lock, size: 80),
                      ),
                      Gap(30),
                      Text(
                        'Title App',
                        style: TextStyle(
                          fontWeight: FontWeight.bold,
                          fontSize: 30,
                          color: Theme.of(context).primaryColor,
                        ),
                      ),
                      Gap(70),
                      DInput(
                        inputSpec: InputSpec(
                          controller: _emailController,
                          hint: 'Email',
                        ),
                      ),
                      Gap(20),
                      DInput(
                        inputSpec: InputSpec(
                          controller: _passwordController,
                          hint: 'Password',
                        ),
                      ),
                      Gap(20),
                      SizedBox(
                        width: double.infinity,
                        height: 50,
                        child: FilledButton(
                          style: ButtonStyle(
                            shape: WidgetStatePropertyAll(
                              RoundedRectangleBorder(
                                borderRadius: BorderRadius.circular(20),
                              ),
                            ),
                          ),
                          onPressed: _executeLogin,
                          child: Text('Login'),
                        ),
                      ),
                    ],
                  ),
                ),
              ),
            );
          },
        ),
      ),
    );
  }

  void _showInvalidMessage(String message) {
    ScaffoldMessenger.of(context).showSnackBar(
      SnackBar(
        content: Text(message, style: TextStyle(color: Colors.white)),
        duration: Duration(seconds: 2),
        backgroundColor: Colors.red,
      ),
    );
  }
}