Designing the Sign-In Page for the Flutter Ecommerce App

In this section, we will focus on designing the sign-in page for our Flutter ecommerce app. The sign-in page is an essential component of the authentication process, allowing users to log in to their accounts. We will create a visually appealing and user-friendly sign-in page that includes input fields for email and password, a sign-in button, and optional links for password recovery or creating a new account. By following the principles of responsive design, we will ensure that the page adapts seamlessly to different screen sizes. Let’s begin designing the sign-in page to provide a smooth and secure login experience for our app users.

import 'package:clickmart/view/authentication/forgot_pass.dart';
import 'package:clickmart/view/authentication/sign_up.dart';
import 'package:flutter/material.dart';
import 'package:flutter_signin_button/flutter_signin_button.dart';

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

  @override
  State<SignIn> createState() => _SignInState();
}

class _SignInState extends State<SignIn> {
  // Form Key
  final GlobalKey<FormState> _formKey = GlobalKey<FormState>();

  // TextForm Controller
  TextEditingController emailController = TextEditingController();
  TextEditingController passwordController = TextEditingController();

  // Form Validation
  bool _validateAndSave() {
    final form = _formKey.currentState;
    if (form!.validate()) {
      form.save();
      return true;
    }
    return false;
  }

  void _validateAndSubmit() {
    if (_validateAndSave()) {
      // TODO: Perform sign-in logic here
    }
  }

  @override
  Widget build(BuildContext context) {
    return WillPopScope(
      onWillPop: () {
        return Future.value(false);
      },
      child: Scaffold(
        appBar: AppBar(
          automaticallyImplyLeading: false,
          title: const Text('Sign In'),
        ),
        body: Container(
          padding: const EdgeInsets.all(16.0),
          child: Form(
            key: _formKey,
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.stretch,
              children: <Widget>[
                TextFormField(
                  controller: emailController,
                  decoration: const InputDecoration(labelText: 'Email'),
                  validator: (value) {
                    if (value!.isEmpty) {
                      return 'Please enter your email';
                    }
                    return null;
                  },
                  onSaved: (value) => emailController.text = value!,
                ),
                const SizedBox(height: 16.0),
                TextFormField(
                  controller: passwordController,
                  decoration: const InputDecoration(labelText: 'Password'),
                  obscureText: true,
                  validator: (value) {
                    if (value!.isEmpty) {
                      return 'Please enter your password';
                    }
                    return null;
                  },
                  onSaved: (value) => passwordController.text = value!,
                ),
                const SizedBox(height: 16.0),
                ElevatedButton(
                  onPressed: _validateAndSubmit,
                  child: const Text('Sign In'),
                ),
                const SizedBox(height: 16.0),
                Center(
                  child: GestureDetector(
                    onTap: _navigateToForgotPass,
                    child: const Text(
                      'Forgot Password ?',
                      style: TextStyle(
                        fontWeight: FontWeight.bold,
                        color: Colors.blue,
                      ),
                    ),
                  ),
                ),
                const SizedBox(height: 16.0),
                Center(
                  child: GestureDetector(
                    onTap: _navigateToSignUp,
                    child: RichText(
                      text: const TextSpan(
                        text: 'Don\'t have an account? ',
                        style: TextStyle(color: Colors.black),
                        children: <TextSpan>[
                          TextSpan(
                            text: 'Sign Up',
                            style: TextStyle(
                              fontWeight: FontWeight.bold,
                              color: Colors.blue,
                            ),
                          ),
                        ],
                      ),
                    ),
                  ),
                ),
                const SizedBox(height: 16.0),
                const Center(
                  child: Text('Or'),
                ),
                const SizedBox(height: 16.0),
                SignInButton(
                  Buttons.Google,
                  onPressed: () {
                    // TODO: Implement Google sign-in logic here
                  },
                ),
              ],
            ),
          ),
        ),
      ),
    );
  }

  // Goto SignUp Page
  void _navigateToSignUp() {
    Navigator.pushReplacement(
      context,
      MaterialPageRoute(builder: (context) => const SignUp()),
    );
  }

  // Goto Forgot Pass Page
  void _navigateToForgotPass() {
    Navigator.pushReplacement(
      context,
      MaterialPageRoute(builder: (context) => const ForgotPassword()),
    );
  }
}