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
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. Recommend to use with [logoTag] and [titleTag]
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

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
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)

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',
};
classLoginScreenextendsStatelessWidget {
Durationget loginTime =>Duration(milliseconds:2250);
Future<String> _authUser(LoginData data) {
print('Name: ${data.name}, Password: ${data.password}');
returnFuture.delayed(loginTime).then((_) {
if (!users.containsKey(data.name)) {
return'Username not exists';
}
if (users[data.name] != data.password) {
return'Password does not match';
}
returnnull;
});
}
Future<String> _recoverPassword(String name) {
print('Name: $name');
returnFuture.delayed(loginTime).then((_) {
if (!users.containsKey(name)) {
return'Username not exists';
}
returnnull;
});
}
@overrideWidgetbuild(BuildContext context) {
returnFlutterLogin(
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.dartimport'package:flutter/material.dart';
import'login_screen.dart';
voidmain() =>runApp(MyApp());
classMyAppextendsStatelessWidget {
@overrideWidgetbuild(BuildContext context) {
returnMaterialApp(
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.dartimport'package:flutter/material.dart';
import'package:flutter_login/flutter_login.dart';
import'dashboard_screen.dart';
classLoginScreenextendsStatelessWidget {
@overrideWidgetbuild(BuildContext context) {
returnFlutterLogin(
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';
classLoginScreenextendsStatelessWidget {
@overrideWidgetbuild(BuildContext context) {
returnFlutterLogin(
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';
classLoginScreenextendsStatelessWidget {
@overrideWidgetbuild(BuildContext context) {
final inputBorder =BorderRadius.vertical(
bottom:Radius.circular(10.0),
top:Radius.circular(20.0),
);
returnFlutterLogin(
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

• VNPAY App Interactions
• Flat UI Login animated

License

• MIT License