cssd/lib/pages/login_screen.dart

import 'package:flutter/material.dart';
import 'package:font_awesome_flutter/font_awesome_flutter.dart';
import 'package:provider/provider.dart';

import '../config/routes.dart';
import '../providers/auth.dart';
import '../providers/connectivity.dart';
import '../widgets/Global/internet_error.dart';

class LoginScreen extends StatefulWidget {
  // static const route = '/HomeScreen';

  @override
  State<StatefulWidget> createState() {
    return _LoginScreenState();
  }
}

class _LoginScreenState extends State<LoginScreen> {
  final _passwordFocusNode = FocusNode();
  final _form = GlobalKey<FormState>();
  bool _isLoading = false;
  final cellNumberController = TextEditingController();
  final passwordController = TextEditingController();

  bool _hidePass = true;
  Map<String, dynamic> map = Map<String, dynamic>();

  @override
  void initState() {
    cellNumberController.text = map['cellNumber'];
    super.initState();
  }

  @override
  void dispose() {
    _passwordFocusNode.dispose();
    super.dispose();
  }

  void _showDialog(String message) {
    showDialog(
      context: context,
      builder: (ctx) => AlertDialog(
        title: Text('Error'),
        content: Text(message),
        actions: <Widget>[
          TextButton(
            child: Text('Ok'),
            onPressed: () {
              Navigator.of(ctx).pop();
            },
          ),
        ],
      ),
    );
  }

  void _login() async {
    if (!_form.currentState.validate()) {
      return;
    }
    _form.currentState.save();
    setState(() {
      _isLoading = true;
    });
    // try {
    await Provider.of<Auth>(context, listen: false)
        .login(
      map['cellNumber'],
      map['password'],
    )
        .then(
      (result) {
        if (result == 'error') {
          _showDialog('Something went wrong!');
          setState(
            () {
              _isLoading = false;
            },
          );
        } else if (result == 'badinput') {
          _showDialog('User or password incorrect!');
          setState(
            () {
              _isLoading = false;
            },
          );
        }
      },
    );
    // }
    // } catch (error) {
    //   _showDialog('something went wrong!');
    //   setState(() {
    //     _isLoading = false;
    //   });
    // }

    // Navigator.pushReplacement(
    //   context,
    //   MaterialPageRoute(builder: (context) {
    //     return HomePage();
    //   }),
    // );
  }

  @override
  Widget build(BuildContext context) {
    final _media = MediaQuery.of(context);
    // final double _pixelRatio = (_media.size.height / _media.size.width * 7 / 5);
    final double _devicewidth = _media.size.width;
    final double _deviceBlockSize = _devicewidth / 100;
    return SafeArea(
      child: Scaffold(
          appBar: AppBar(
            centerTitle: true,
            title: Text('CSSD'),
          ),
          body: Selector<ConnectivityProvider, String>(
        builder: (ctx, value, _) => value != 'offline'
            ? _isLoading
                ? Center(
                    child: CircularProgressIndicator(),
                  )
                : Form(
                    key: _form,
                    child: ListView(
                      padding: EdgeInsets.symmetric(horizontal: 20),
                      children: <Widget>[
                        Container(
                          padding: EdgeInsets.symmetric(vertical: 20),
                          child: Text(
                            'LOGIN',
                            textAlign: TextAlign.left,
                            style: TextStyle(
                              color: Colors.black,
                              fontSize: 6 * _deviceBlockSize,
                              letterSpacing: 3,
                              fontWeight: FontWeight.w700,
                            ),
                          ),
                        ),
                        TextFormField(
                          validator: (value) {
                            if (value.isEmpty) {
                              return 'Cell number is required.';
                            }
                            RegExp regExp =
                                RegExp(r'^09[0,1,2,3,9]{1}[0-9]{8}$');
                            if (!regExp.hasMatch(value)) {
                              return 'Enter a valid cell number';
                            }
                            return null;
                          },
                          controller: cellNumberController,
                          decoration: InputDecoration(
                            icon: Icon(
                              Icons.call,
                              size: 6 * _deviceBlockSize,
                            ),
                            labelStyle: TextStyle(
                              fontWeight: FontWeight.w100,
                              fontSize: 4 * _deviceBlockSize,
                            ),
                            labelText: 'Cell Number',
                            isDense: true,
                            contentPadding: EdgeInsets.symmetric(
                                vertical: 2, horizontal: 3),
                          ),
                          style: TextStyle(
                            fontWeight: FontWeight.w700,
                            fontSize: 5 * _deviceBlockSize,
                          ),
                          keyboardType: TextInputType.phone,
                          textInputAction: TextInputAction.next,
                          onFieldSubmitted: (_) {
                            FocusScope.of(context)
                                .requestFocus(_passwordFocusNode);
                          },
                          onSaved: (value) {
                            map['cellNumber'] = value;
                          },
                        ),
                        SizedBox(
                          height: 30,
                        ),
                        TextFormField(
                          validator: (value) {
                            if (value.isEmpty) {
                              return 'Password is required.';
                            }
                            if (value.length < 8) {
                              return 'Password at least is 8 characters.';
                            }
                            return null;
                          },
                          obscureText: _hidePass,
                          controller: passwordController,
                          decoration: InputDecoration(
                            icon: Icon(
                              FontAwesomeIcons.starOfLife,
                              size: 6 * _deviceBlockSize,
                            ),
                            labelStyle: TextStyle(
                              fontWeight: FontWeight.w100,
                              fontSize: 4 * _deviceBlockSize,
                            ),
                            labelText: 'Password',
                            isDense: true,
                            contentPadding: EdgeInsets.symmetric(
                                vertical: 2, horizontal: 3),
                            suffixIcon: InkWell(
                              child: Icon(FontAwesomeIcons.eye),
                              onTap: () {
                                setState(() {
                                  _hidePass = !_hidePass;
                                });
                              },
                            ),
                          ),
                          style: TextStyle(
                            fontWeight: FontWeight.w700,
                            fontSize: 5 * _deviceBlockSize,
                          ),
                          textInputAction: TextInputAction.done,
                          onFieldSubmitted: (_) {
                            _login();
                          },
                          keyboardType: TextInputType.visiblePassword,
                          focusNode: _passwordFocusNode,
                          onSaved: (value) {
                            map['password'] = value;
                          },
                        ),
                        SizedBox(height: 40),
                        Row(
                          children: <Widget>[
                            InkWell(
                              onTap: () => _login(),
                              child: Container(
                                  width: 40 * _deviceBlockSize,
                                  padding: EdgeInsets.symmetric(
                                    horizontal: 5 * _deviceBlockSize,
                                    vertical: 10,
                                  ),
                                  // margin:
                                  //     EdgeInsets.symmetric(horizontal: 35, vertical: 15),
                                  decoration: BoxDecoration(
                                    gradient: LinearGradient(
                                      colors: [Colors.blue, Colors.green],
                                    ),
                                    borderRadius: BorderRadius.circular(7),
                                  ),
                                  child: Row(
                                    mainAxisSize: MainAxisSize.min,
                                    children: <Widget>[
                                      Spacer(),
                                      Icon(
                                        Icons.exit_to_app,
                                        color: Colors.white,
                                      ),
                                      Text(
                                        'Login',
                                        style: TextStyle(color: Colors.white),
                                      ),
                                      Spacer()
                                    ],
                                  )),
                            ),
                            Spacer(),
                          ],
                        ),
                        SizedBox(height: 10),
                        TextButton(
                          child: Align(
                            alignment: Alignment.centerLeft,
                            child: Text(
                              'Forgot Password ?',
                              style: TextStyle(
                                color: Colors.black54,
                                decoration: TextDecoration.underline,
                              ),
                            ),
                          ),
                          onPressed: () => Navigator.of(context)
                              .pushNamed(Routes.forgetPassScreen),
                        ),
                      ],
                    ),
                  )
            : ConnectionErrorBox(),
        selector: (_, connectivity) => connectivity.conStatus,
      )),
    );
  }
}