Flutter Login Screen Widget

March 5, 2020 totosugito Animation, Login Page, Ui 0

Flutter Login Screen Widget

Flutter Login

FlutterLogin is a ready-made login/signup widget with many animation effects to demonstrate the capabilities of Flutter

Installation

Follow the install instructions here

Reference

Property	Type	Desciption
onSignup	`AuthCallback`	_{Called when the user hit the submit button when in sign up mode}
onLogin	`AuthCallback`	_{Called when the user hit the submit button when in login mode}
onRecoverPassword	`RecoverCallback`	_{Called when the user hit the submit button when in recover password mode}
title	`String`	_{The large text above the login [Card], usually the app or company name. Leave the string empty or null if you want no title.}
logo	`String`	_{The path to the asset image that will be passed to the Image.asset()}
messages	`LoginMessages`	_{Describes all of the labels, text hints, button texts and other auth descriptions}
theme	`LoginTheme`	_{FlutterLogin’s theme. If not specified, it will use the default theme as shown in the demo gifs and use the colorsheme in the closest Theme widget}
emailValidator	_{FormFieldValidator<String>}	_{Email validating logic, Returns an error string to display if the input is invalid, or null otherwise}
passwordValidator	_{FormFieldValidator<String>}	_{Same as emailValidator but for password}
_{onSubmitAnimationCompleted}	`Function`	_{Called after the submit animation’s completed. Put your route transition logic here}
logoTag	`String`	_{Hero tag for logo image. If not specified, it will simply fade out when changing route}
titleTag	`String`	_{Hero tag for title text. Need to specify LoginTheme.beforeHeroFontSize and LoginTheme.afterHeroFontSize if you want different font size before and after hero animation}
showDebugButtons	`bool`	_{Display the debug buttons to quickly forward/reverse login animations. In release mode, this will be overrided to false regardless of the value passed in}

NOTE: It is recommended that the child widget of the Hero widget should be the same in both places. For title’s hero animation use the LoginThemeHelper.loginTextStyle in the next screen to get the style of the exact text widget in the login screen. LoginThemeHelper can be accessed by adding this line

import 'package:flutter_login/theme.dart';

LoginMessages

Property	Type	Desciption
usernameHint	`String`	Hint text of the user name [TextField]
passwordHint	`String`	Hint text of the password [TextField]
confirmPasswordHint	`String`	Hint text of the confirm password [TextField]
forgotPasswordButton	`String`	Forgot password button’s label
loginButton	`String`	Login button’s label
signupButton	`String`	Signup button’s label
recoverPasswordButton	`String`	Recover password button’s label
recoverPasswordIntro	`String`	Intro in password recovery form
recoverPasswordDescription	`String`	Description in password recovery form
goBackButton	`String`	Go back button’s label. Go back button is used to go back to to login/signup form from the recover password form
confirmPasswordError	`String`	The error message to show when the confirm password not match with the original password
recoverPasswordSuccess	`String`	The success message to show after submitting recover password

LoginTheme

Property	Type	Desciption
primaryColor	`Color`	The background color of major parts of the widget like the login screen and buttons
accentColor	`Color`	The secondary color, used for title text color, loading icon, etc. Should be contrast with the [primaryColor]
errorColor	`Color`	The color to use for [TextField] input validation errors
cardTheme	`CardTheme`	The colors and styles used to render auth [Card]
inputTheme	`InputDecorationTheme`	Defines the appearance of all [TextField]s
buttonTheme	`LoginButtonTheme`	A theme for customizing the shape, elevation, and color of the submit button
titleStyle	`TextStyle`	Text style for the big title
bodyStyle	`TextStyle`	Text style for small text like the recover password description
textFieldStyle	`TextStyle`	Text style for [TextField] input text
buttonStyle	`TextStyle`	Text style for button text
beforeHeroFontSize	`double`	Defines the font size of the title in the login screen (before the hero transition)
afterHeroFontSize	`double`	Defines the font size of the title in the screen after the login screen (after the hero transition)
pageColorLight	`Color`	The optional light background color of login screen; if provided, used for light gradient instead of primaryColor
pageColorDark	`Color`	The optional dark background color of login screen; if provided, used for dark gradient instead of primaryColor

Examples

You can view the complete example in the [example project] which resulted in the gif above

Basic example

import 'package:flutter/material.dart';
import 'package:flutter_login/flutter_login.dart';
import 'dashboard_screen.dart';

const users = const {
  'dribbble@gmail.com': '12345',
  'hunter@gmail.com': 'hunter',
};

class LoginScreen extends StatelessWidget {
  Duration get loginTime => Duration(milliseconds: 2250);

  Future<String> _authUser(LoginData data) {
    print('Name: ${data.name}, Password: ${data.password}');
    return Future.delayed(loginTime).then((_) {
      if (!users.containsKey(data.name)) {
        return 'Username not exists';
      }
      if (users[data.name] != data.password) {
        return 'Password does not match';
      }
      return null;
    });
  }

  Future<String> _recoverPassword(String name) {
    print('Name: $name');
    return Future.delayed(loginTime).then((_) {
      if (!users.containsKey(name)) {
        return 'Username not exists';
      }
      return null;
    });
  }

  @override
  Widget build(BuildContext context) {
    return FlutterLogin(
      title: 'ECORP',
      logo: 'assets/images/ecorp-lightblue.png',
      onLogin: _authUser,
      onSignup: _authUser,
      onSubmitAnimationCompleted: () {
        Navigator.of(context).pushReplacement(MaterialPageRoute(
          builder: (context) => DashboardScreen(),
        ));
      },
      onRecoverPassword: _recoverPassword,
    );
  }
}

Theming via `ThemeData`

Login theme can be customized indectly by using ThemeData like this

// main.dart
import 'package:flutter/material.dart';
import 'login_screen.dart';

void main() => runApp(MyApp());

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Login Demo',
      theme: ThemeData(
        primarySwatch: Colors.deepPurple,
        accentColor: Colors.orange,
        cursorColor: Colors.orange,
        textTheme: TextTheme(
          display2: TextStyle(
            fontFamily: 'OpenSans',
            fontSize: 45.0,
            color: Colors.orange,
          ),
          button: TextStyle(
            fontFamily: 'OpenSans',
          ),
          subhead: TextStyle(fontFamily: 'NotoSans'),
          body1: TextStyle(fontFamily: 'NotoSans'),
        ),
      ),
      home: LoginScreen(),
    );
  }
}

// login_screen.dart
import 'package:flutter/material.dart';
import 'package:flutter_login/flutter_login.dart';
import 'dashboard_screen.dart';

class LoginScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return FlutterLogin(
      title: 'ECORP',
      logo: 'assets/images/ecorp.png',
      onLogin: (_) => Future(null),
      onSignup: (_) => Future(null),
      onSubmitAnimationCompleted: () {
        Navigator.of(context).pushReplacement(MaterialPageRoute(
          builder: (context) => DashboardScreen(),
        ));
      },
      onRecoverPassword: (_) => Future(null),
    );
  }
}

Custom labels

import 'package:flutter/material.dart';
import 'package:flutter_login/flutter_login.dart';
import 'dashboard_screen.dart';

class LoginScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return FlutterLogin(
      title: 'ECORP',
      logo: 'assets/images/ecorp.png',
      onLogin: (_) => Future(null),
      onSignup: (_) => Future(null),
      onSubmitAnimationCompleted: () {
        Navigator.of(context).pushReplacement(MaterialPageRoute(
          builder: (context) => DashboardScreen(),
        ));
      },
      onRecoverPassword: (_) => Future(null),
      messages: LoginMessages(
        usernameHint: 'Username',
        passwordHint: 'Pass',
        confirmPasswordHint: 'Confirm',
        loginButton: 'LOG IN',
        signupButton: 'REGISTER',
        forgotPasswordButton: 'Forgot huh?',
        recoverPasswordButton: 'HELP ME',
        goBackButton: 'GO BACK',
        confirmPasswordError: 'Not match!',
        recoverPasswordDescription:
            'Lorem Ipsum is simply dummy text of the printing and typesetting industry',
        recoverPasswordSuccess: 'Password rescued successfully',
      ),
    );
  }
}

Login/Signup	Password Recovery

Theme customization


import 'package:flutter/material.dart';
import 'package:flutter_login/flutter_login.dart';
import 'dashboard_screen.dart';

class LoginScreen extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    final inputBorder = BorderRadius.vertical(
      bottom: Radius.circular(10.0),
      top: Radius.circular(20.0),
    );

    return FlutterLogin(
      title: 'ECORP',
      logo: 'assets/images/ecorp-lightgreen.png',
      onLogin: (_) => Future(null),
      onSignup: (_) => Future(null),
      onSubmitAnimationCompleted: () {
        Navigator.of(context).pushReplacement(MaterialPageRoute(
          builder: (context) => DashboardScreen(),
        ));
      },
      onRecoverPassword: (_) => Future(null),
      theme: LoginTheme(
        primaryColor: Colors.teal,
        accentColor: Colors.yellow,
        errorColor: Colors.deepOrange,
        titleStyle: TextStyle(
          color: Colors.greenAccent,
          fontFamily: 'Quicksand',
          letterSpacing: 4,
        ),
        bodyStyle: TextStyle(
          fontStyle: FontStyle.italic,
          decoration: TextDecoration.underline,
        ),
        textFieldStyle: TextStyle(
          color: Colors.orange,
          shadows: [Shadow(color: Colors.yellow, blurRadius: 2)],
        ),
        buttonStyle: TextStyle(
          fontWeight: FontWeight.w800,
          color: Colors.yellow,
        ),
        cardTheme: CardTheme(
          color: Colors.yellow.shade100,
          elevation: 5,
          margin: EdgeInsets.only(top: 15),
          shape: ContinuousRectangleBorder(
              borderRadius: BorderRadius.circular(100.0)),
        ),
        inputTheme: InputDecorationTheme(
          filled: true,
          fillColor: Colors.purple.withOpacity(.1),
          contentPadding: EdgeInsets.zero,
          errorStyle: TextStyle(
            backgroundColor: Colors.orange,
            color: Colors.white,
          ),
          labelStyle: TextStyle(fontSize: 12),
          enabledBorder: UnderlineInputBorder(
            borderSide: BorderSide(color: Colors.blue.shade700, width: 4),
            borderRadius: inputBorder,
          ),
          focusedBorder: UnderlineInputBorder(
            borderSide: BorderSide(color: Colors.blue.shade400, width: 5),
            borderRadius: inputBorder,
          ),
          errorBorder: UnderlineInputBorder(
            borderSide: BorderSide(color: Colors.red.shade700, width: 7),
            borderRadius: inputBorder,
          ),
          focusedErrorBorder: UnderlineInputBorder(
            borderSide: BorderSide(color: Colors.red.shade400, width: 8),
            borderRadius: inputBorder,
          ),
          disabledBorder: UnderlineInputBorder(
            borderSide: BorderSide(color: Colors.grey, width: 5),
            borderRadius: inputBorder,
          ),
        ),
        buttonTheme: LoginButtonTheme(
          splashColor: Colors.purple,
          backgroundColor: Colors.pinkAccent,
          highlightColor: Colors.lightGreen,
          elevation: 9.0,
          highlightElevation: 6.0,
          shape: BeveledRectangleBorder(
            borderRadius: BorderRadius.circular(10),
          ),
          // shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(5)),
          // shape: CircleBorder(side: BorderSide(color: Colors.green)),
          // shape: ContinuousRectangleBorder(borderRadius: BorderRadius.circular(55.0)),
        ),
      ),
    );
  }
}

Inspiration

License

MIT License

Source Code

Please Visit Flutter Login Screen Widget Source Code at GitHub

Flutter Login Screen Widget

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