LoginScreen

LoginScreen.dart

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

  @override
  State<StatefulWidget> createState() => LoginScreenState();
}

class LoginScreenState extends State<LoginScreen> {
  final TextEditingController _loginEditingController = TextEditingController();
  final TextEditingController _passwordEditingController =
      TextEditingController();

  bool _isLoginContinues = false;

  @override
  Widget build(BuildContext context) {
    if (_isLoginContinues) {
      return Scaffold(
        body: Center(
          child: Container(
            margin: const EdgeInsets.only(left: 8),
            height: 18,
            width: 18,
            child: const CircularProgressIndicator(
              strokeWidth: 2,
            ),
          ),
        ),
      );
    }

    return Scaffold(
      body: Center(
        child: SingleChildScrollView(
          child: Container(
              padding: const EdgeInsets.symmetric(horizontal: 16.0),
              child: ConstrainedBox(
                constraints: const BoxConstraints(maxWidth: 400),
                child: Column(
                  children: <Widget>[
                    TextField(
                      keyboardType: TextInputType.text,
                      controller: _loginEditingController,
                      decoration: const InputDecoration(labelText: 'Login'),
                    ),
                    TextField(
                      keyboardType: TextInputType.visiblePassword,
                      controller: _passwordEditingController,
                      decoration: const InputDecoration(labelText: 'Password'),
                      obscureText: true,
                      enableSuggestions: false,
                      autocorrect: false,
                      onSubmitted: (_) {
                        _login();
                      },
                    ),
                    Container(
                      margin: const EdgeInsets.only(top: 8),
                      child: ElevatedButton(
                        onPressed: _login,
                        child: const Text('Login'),
                      ),
                    )
                  ],
                ),
              )),
        ),
      ),
    );
  }

  void _login() {
    var userToLogin = CubeUser()
      ..login = _loginEditingController.text
      ..password = _passwordEditingController.text;

    setState(() {
      _isLoginContinues = true;
    });

    createSession(userToLogin).then((cubeSession) async {
      print("createSession cubeSession: $cubeSession");
      CubeChatConnection.instance
          .login(userToLogin..id = cubeSession.user!.id)
          .then((cubeUser) {
        setState(() {
          _isLoginContinues = false;
        });

        Navigator.pushReplacementNamed(
          context,
          'select_dialog',
          arguments: {userArgName: cubeUser},
        );
      }).catchError((error) {
        // process creating Chat session error
        print("loginChat error: $error");
        setState(() {
          _isLoginContinues = false;
        });
      });
    }).catchError((error) {
      // process creating API session error
      print("createSession error: $error");
      setState(() {
        _isLoginContinues = false;
      });
    });
  }
}