canvasing/lib/Screens/Login/login_screen.dart

import 'dart:async';
import 'dart:convert';
import 'package:firebase_messaging/firebase_messaging.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:flutter_udid/flutter_udid.dart';
import 'package:fluttertoast/fluttertoast.dart';
import 'package:google_fonts/google_fonts.dart';
import 'package:employee_selfservice_mobile/Screens/ForgotPassword/forgotPassword_screen.dart';
import 'package:employee_selfservice_mobile/Screens/Login/background.dart';
import 'package:employee_selfservice_mobile/Screens/Login/post_result_model.dart';
import 'package:employee_selfservice_mobile/Screens/Splash/splash_screen.dart';
import 'package:progress_dialog_null_safe/progress_dialog_null_safe.dart';
import 'package:shared_preferences/shared_preferences.dart';
import '../Home/home_screen.dart';
import 'inputWidget.dart';
import 'dart:developer' as logDev;
//import 'package:plain_notification_token/plain_notification_token.dart';

class LoginView extends StatefulWidget {
  @override
  _LoginView createState() => _LoginView();
}

class _LoginView extends State<LoginView> {

  @override
  Widget build(BuildContext context) {
    return Scaffold(
        resizeToAvoidBottomInset: false,
        backgroundColor: Colors.white,
        body: Stack(
          children: <Widget>[
            Background(),
            LoginScreen(),
          ],
        ));
  }
}

class LoginScreen extends StatefulWidget {
  @override
  State<LoginScreen> createState() => _LoginScreenState();
}

class _LoginScreenState extends State<LoginScreen> {
  late LoginPostResult loginPostResult;
  String version = "1.0.0";
  String notif_token = "";

  late StreamSubscription onTokenRefreshSubscription;

  @override
  void initState() {
    super.initState();
  }

  @override
  Widget build(BuildContext context) {
    ProgressDialog loading = ProgressDialog(context);
    loading = ProgressDialog(context,
        type: ProgressDialogType.normal, isDismissible: false, showLogs: true);
    loading.style(
        message: 'Please Wait .....',
        borderRadius: 5,
        backgroundColor: Colors.white,
        progressWidget: CircularProgressIndicator(),
        elevation: 10.0,
        padding: EdgeInsets.all(10),
        insetAnimCurve: Curves.easeInOut,
        progress: 0.0,
        maxProgress: 100.0,
        progressTextStyle: TextStyle(
            color: Colors.black, fontSize: 10.0, fontWeight: FontWeight.w400),
        messageTextStyle: TextStyle(
            color: Colors.black, fontSize: 15.0, fontWeight: FontWeight.w600));

    return SingleChildScrollView(
      reverse: true,
        padding: EdgeInsets.only(bottom: MediaQuery.of(context).viewInsets.bottom),
        child: Column(
        children: <Widget>[
          Padding(
            padding:
                EdgeInsets.only(top: MediaQuery.of(context).size.height / 2.45),
          ),
          Column(
            children: <Widget>[
              Column(
                crossAxisAlignment: CrossAxisAlignment.center,
                children: <Widget>[
                  Padding(
                    padding: EdgeInsets.only(top: 0),
                    child: Text(
                      "Login",
                      style: GoogleFonts.knewave(
                          color: Colors.blueAccent, fontSize: 25),
                    ),
                  ),
                ],
              ),
              Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: <Widget>[
                  Padding(
                    padding: EdgeInsets.only(left: 40, bottom: 5, top: 20),
                    child: Text(
                      "Email",
                      style: TextStyle(fontSize: 16, color: Colors.black87),
                    ),
                  ),
                  Stack(
                    alignment: Alignment.bottomRight,
                    children: <Widget>[
                      InputWidgetEmail(20.0, 20.0),
                      Padding(
                        padding: EdgeInsets.only(right: 50),
                      ),
                    ],
                  ),
                ],
              ),
              Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: <Widget>[
                  Padding(
                    padding: EdgeInsets.only(left: 40, bottom: 5),
                    child: Text(
                      "Password",
                      style: TextStyle(fontSize: 16, color: Colors.black87),
                    ),
                  ),
                  Stack(
                    alignment: Alignment.bottomRight,
                    children: <Widget>[
                      InputWidgetPassword(20.0, 20.0),
                      Padding(
                        padding: EdgeInsets.only(right: 15),
                        child: Row(
                          children: <Widget>[
                            Expanded(
                                child: Padding(
                              padding: EdgeInsets.only(top: 0),
                            )),
                            InkWell(
                              child: Container(
                                padding: EdgeInsets.all(10),
                                decoration: ShapeDecoration(
                                  shape: CircleBorder(),
                                  gradient: LinearGradient(
                                      colors: Gradients2,
                                      begin: Alignment.topLeft,
                                      end: Alignment.bottomRight),
                                ),
                                child: ImageIcon(
                                  AssetImage("assets/images/ic_forward.png"),
                                  size: 40,
                                  color: Colors.white,
                                ),
                              ),
                              onTap: () async {
                                String imei;
                                try {
                                  imei = await FlutterUdid.udid;
                                } on PlatformException {
                                  imei = 'Failed to get UDID.';
                                }
                                logDev.log(imei, name: "IMEI");
                                if (!validateForm(context)) {
                                  return;
                                } else {
                                  await loading.show();

                                  final notif_token = await FirebaseMessaging.instance.getToken();
                                  logDev.log(notif_token.toString(), name: "NOTIFICATION TOKEN");

                                  LoginPostResult.connectToAPI(
                                          emailController.text.toString(),
                                          passwordController.text.toString(),
                                          notif_token!,
                                          version,
                                          platform(),
                                          imei)
                                      .then((valueResult) async {
                                    Map<String, dynamic> object = json.decode(valueResult);
                                    if (object.containsKey("result").toString() == "true") {
                                      String status = object['result']['status'].toString();
                                      if (status == "success") {
                                        Fluttertoast.showToast(
                                            msg: "Login Success",
                                            toastLength: Toast.LENGTH_SHORT,
                                            gravity: ToastGravity.CENTER,
                                            timeInSecForIosWeb: 1,
                                            textColor: Colors.white,
                                            fontSize: 16.0);

                                        var prefs = await SharedPreferences.getInstance();
                                        await prefs.setString('version', version);
                                        await prefs.setString('device', object['result']['device'].toString());
                                        await prefs.setString('session', object['result']['hash'].toString());
                                        await prefs.setString('name', object['result']['name'].toString());
                                        await prefs.setString('notif_token', notif_token);

                                        emailController.clear();
                                        passwordController.clear();

                                        await loading.hide();
                                        Navigator.pushReplacement(context, MaterialPageRoute(builder: (context) => HomeView()));
                                      } else if (status == "failed") {
                                        String message = object['result']['message'].toString();
                                        Fluttertoast.showToast(
                                            msg: message,
                                            toastLength: Toast.LENGTH_SHORT,
                                            gravity: ToastGravity.CENTER,
                                            timeInSecForIosWeb: 1,
                                            textColor: Colors.white,
                                            fontSize: 16.0);
                                        await loading.hide();
                                      }
                                    } else {
                                      await loading.hide();
                                      alertDialogFailedResponse(context);
                                    }
                                  });
                                }
                              },
                            )
                          ],
                        ),
                      ),
                      /*Padding(
                          padding: EdgeInsets.only(bottom: MediaQuery.of(context).viewInsets.bottom)
                      )*/
                    ],
                  ),
                ],
              ),
              Padding(
                padding: EdgeInsets.only(bottom: 10),
              ),
              InkWell(
                  child:
                      roundedRectButton("Forgot Password?", Gradients1, false),
                  onTap: () {
                    Navigator.push(
                        context,
                        MaterialPageRoute(
                            builder: (context) => ForgotPasswordView()));
                  })
            ],
          )
        ],
      ),
    );
  }
}

Widget roundedRectButton(
    String title, List<Color> gradient, bool isEndIconVisible) {
  return Builder(builder: (BuildContext mContext) {
    return Align(
      alignment: Alignment.centerLeft,
      child: Stack(
        children: <Widget>[
          Container(
            alignment: Alignment.centerRight,
            width: MediaQuery.of(mContext).size.width / 2.45,
            decoration: ShapeDecoration(
              shape: RoundedRectangleBorder(
                  borderRadius: BorderRadius.only(
                      topRight: Radius.circular(20.0),
                      bottomRight: Radius.circular(20.0))),
              gradient: LinearGradient(
                  colors: gradient,
                  begin: Alignment.topLeft,
                  end: Alignment.bottomRight),
            ),
            child: Text(title,
                style: TextStyle(
                    decoration: TextDecoration.underline,
                    color: Colors.white,
                    fontSize: 15,
                    fontWeight: FontWeight.w500)),
            padding: EdgeInsets.all(10),
          ),
          Visibility(
            visible: isEndIconVisible,
            child: Padding(
                padding: EdgeInsets.only(right: 10),
                child: ImageIcon(
                  AssetImage("assets/images/ic_forward.png"),
                  size: 30,
                  color: Colors.white,
                )),
          ),
        ],
      ),
    );
  });
}

const List<Color> Gradients1 = [
  /*Color(0xFFFFFFFF),
  Color(0xFFFFFFFF),*/
  Color(0xFF03A0FE),
  Colors.pink,
];

const List<Color> Gradients2 = [
  Color(0xFFFF9945),
  Color(0xFFFc6076),
];

bool validateForm(BuildContext context) {
  bool result = true;
  if (emailController.text.toString().isEmpty) {
    /*final snackBar = SnackBar(content: Text("Email Required"));
    ScaffoldMessenger.of(context).showSnackBar(snackBar);*/
    Fluttertoast.showToast(
        msg: "Email Required",
        toastLength: Toast.LENGTH_SHORT,
        gravity: ToastGravity.CENTER,
        timeInSecForIosWeb: 1,
        textColor: Colors.white,
        fontSize: 16.0);
    result = false;
  } else if (!emailController.text.toString().contains("@")) {
    Fluttertoast.showToast(
        msg: "Incorrect email format",
        toastLength: Toast.LENGTH_SHORT,
        gravity: ToastGravity.CENTER,
        timeInSecForIosWeb: 1,
        textColor: Colors.white,
        fontSize: 16.0);
    result = false;
  } else if (passwordController.text.toString().isEmpty) {
    Fluttertoast.showToast(
        msg: "Password Required",
        toastLength: Toast.LENGTH_SHORT,
        gravity: ToastGravity.CENTER,
        timeInSecForIosWeb: 1,
        textColor: Colors.white,
        fontSize: 16.0);
    result = false;
  }

  return result;
}

alertDialogFailedResponse(BuildContext context){
  Widget okButton = TextButton(
    child: Text("Refresh"),
    onPressed: () {
      Navigator.of(context, rootNavigator: true).pop();
      Navigator.pushReplacement(context, MaterialPageRoute(
          builder: (context) => SplashScreen()));
    },
  );

  Widget noButton = TextButton(
    child: Text("Back"),
    onPressed: () {
      Navigator.of(context, rootNavigator: true).pop();
      Navigator.pop(context);

    },
  );

  // set up the AlertDialog
  AlertDialog alert = AlertDialog(
    title: Text("Employee Self Service"),
    content: Text("Server Response Error"),
    actions: [
      noButton,
      okButton,
    ],
  );

  // show the dialog
  showDialog(
    context: context,
    barrierDismissible: false,
    builder: (BuildContext context) {
      return alert;
    },
  );
}