main.dart

class GoogleSignIn extends StatefulWidget {
  GoogleSignIn({Key? key}) : super(key: key);

  @override
  _GoogleSignInState createState() => _GoogleSignInState();
}

class _GoogleSignInState extends State<GoogleSignIn> {
  bool isLoading = false;

  @override
  Widget build(BuildContext context) {
    Size size = MediaQuery.of(context).size;
    return  !isLoading? SizedBox(
      width: size.width * 0.8,
      child: OutlinedButton.icon(
        icon: FaIcon(FontAwesomeIcons.google),
        onPressed: () async {
          setState(() {
            isLoading = true;
          });
          FirebaseService service = new FirebaseService();
          try {
           await service.signInwithGoogle();
           Navigator.pushNamedAndRemoveUntil(context, Constants.homeNavigate, (route) => false);
          } catch(e){
            if(e is FirebaseAuthException){
              showMessage(e.message!);
            }
          }
          setState(() {
            isLoading = false;
          });
        },
        label: Text(
          Constants.textSignInGoogle,
          style: TextStyle(
              color: Constants.kBlackColor, fontWeight: FontWeight.bold),
        ),
        style: ButtonStyle(
            backgroundColor:
                MaterialStateProperty.all<Color>(Constants.kGreyColor),
            side: MaterialStateProperty.all<BorderSide>(BorderSide.none)),
      ),
    ) : CircularProgressIndicator();
  }