fcs/lib/pages/pin_login_dialog.dart

import 'dart:async';

import 'package:flutter/material.dart';
import 'package:flutter_verification_code_input/flutter_verification_code_input.dart';
import 'package:provider/provider.dart';
import 'package:fcs/model/main_model.dart';
import 'package:fcs/pages/util.dart';
import 'package:fcs/theme/theme.dart';
import 'package:quiver/async.dart';

class PinLoginDialog extends StatefulWidget {
  @override
  _PinLoginDialogState createState() => _PinLoginDialogState();
}

class _PinLoginDialogState extends State<PinLoginDialog> {
  String pin;

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

  @override
  Widget build(BuildContext context) {
    var mainModel = Provider.of<MainModel>(context);

    return AlertDialog(
      shape: RoundedRectangleBorder(
          borderRadius: BorderRadius.all(Radius.circular(32.0))),
      title: Column(
        children: <Widget>[
          Image.asset(
            "assets/pin.png",
            height: 90,
            color: primaryColor,
          ),
          Text(
            "Enter PIN Code",
            style: TextStyle(
                color: primaryColor, fontWeight: FontWeight.bold, fontSize: 20),
          ),
        ],
      ),
      content: Container(
        width: double.maxFinite,
        height: 120.0,
        child: new ListView(
          shrinkWrap: true,
          children: <Widget>[
            Center(
              child: VerificationCodeInput(
                keyboardType: TextInputType.number,
                length: 6,
                autofocus: false,
                itemSize: 40,
                itemDecoration: BoxDecoration(
                  border: Border.all(
                    color: Colors.grey,
                  ),
                ),
                textStyle: TextStyle(fontWeight: FontWeight.bold, fontSize: 23),
                onCompleted: (String value) {
                  this.pin = value;
                },
              ),
            ),
            SizedBox(
              height: 15,
            ),
            Row(
              mainAxisAlignment: MainAxisAlignment.center,
              crossAxisAlignment: CrossAxisAlignment.center,
              children: <Widget>[
                FlatButton(
                    child: Text("Cancel"),
                    onPressed: () {
                      Navigator.of(context).pop();
                    }),
                FlatButton(
                    color: primaryColor,
                    child: Text("OK",
                        style: TextStyle(
                            color: Colors.white, fontWeight: FontWeight.bold)),
                    onPressed: () async {
                      if (this.pin == null) return;

                      if (mainModel.user.pin == this.pin) {
                        mainModel.resetPinTimer();
                        Navigator.of(context).pop();
                      } else {
                        showMsgDialog(context, "Error", "Invalid PIN Code !");
                      }
                    }),
              ],
            )
          ],
        ),
      ),
    );
  }
}