qrcode.dart

import 'dart:developer';
import 'dart:io';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:provider/provider.dart';

import 'package:qr_code_scanner/qr_code_scanner.dart';
import 'dasboard.dart';
import 'model/undangan.dart';
import 'package:qrcode2/apiTamu.dart';

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

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

class _QRViewExampleState extends State<QRViewExample> {
  Barcode? result;
  QRViewController? controller;
  final GlobalKey qrKey = GlobalKey(debugLabel: 'QR');

  @override
  void reassemble() {
    super.reassemble();
    if (Platform.isAndroid) {
      controller?.pauseCamera();
    }
    controller?.resumeCamera();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      body: Column(
        children: <Widget>[
          if (result == null)
            Expanded(flex: 4, child: _buildQrView(context))
          else
            const CircularProgressIndicator(),
          Expanded(
            flex: 1,
            child: FittedBox(
              fit: BoxFit.contain,
              child: Column(
                mainAxisAlignment: MainAxisAlignment.spaceEvenly,
                children: <Widget>[
                  if (result != null)
                    Text(
                        'Barcode Type: ${describeEnum(result!.format)}   Data: ${result!.code}')
                  else
                    const Text('Scan a code'),
                  ElevatedButton(
                    onPressed: () {
                      setState(() {
                        result = null;
                      });
                    },
                    child: const Text('coba lagi'),
                  ),
                  Row(
                    mainAxisAlignment: MainAxisAlignment.center,
                    crossAxisAlignment: CrossAxisAlignment.center,
                    children: <Widget>[
                      Container(
                        margin: const EdgeInsets.all(8),
                        child: ElevatedButton(
                          onPressed: () async {
                            await controller?.toggleFlash();
                            setState(() {});
                          },
                          child: FutureBuilder(
                            future: controller?.getFlashStatus(),
                            builder: (context, snapshot) {
                              return Text('Flash: ${snapshot.data}');
                            },
                          ),
                        ),
                      ),
                      Container(
                        margin: const EdgeInsets.all(8),
                        child: ElevatedButton(
                          onPressed: () async {
                            await controller?.flipCamera();
                            setState(() {});
                          },
                          child: FutureBuilder(
                            future: controller?.getCameraInfo(),
                            builder: (context, snapshot) {
                              if (snapshot.data != null) {
                                return Text(
                                    'Camera facing ${describeEnum(snapshot.data!)}');
                              } else {
                                return const Text('loading');
                              }
                            },
                          ),
                        ),
                      ),
                    ],
                  ),
                  Row(
                    mainAxisAlignment: MainAxisAlignment.center,
                    crossAxisAlignment: CrossAxisAlignment.center,
                    children: <Widget>[
                      Container(
                        margin: const EdgeInsets.all(8),
                        child: ElevatedButton(
                          onPressed: () async {
                            await controller?.pauseCamera();
                          },
                          child: const Text(
                            'pause',
                            style: TextStyle(fontSize: 20),
                          ),
                        ),
                      ),
                      Container(
                        margin: const EdgeInsets.all(8),
                        child: ElevatedButton(
                          onPressed: () async {
                            await controller?.resumeCamera();
                          },
                          child: const Text('resume',
                              style: TextStyle(fontSize: 20)),
                        ),
                      ),
                    ],
                  ),
                ],
              ),
            ),
          )
        ],
      ),
    );
  }

  Widget _buildQrView(BuildContext context) {
    // For this example we check how width or tall the device is and change the scanArea and overlay accordingly.
    var scanArea = (MediaQuery.of(context).size.width < 400 ||
            MediaQuery.of(context).size.height < 400)
        ? 400.0
        : 400.0;
    // To ensure the Scanner view is properly sizes after rotation
    // we need to listen for Flutter SizeChanged notification and update controller
    return QRView(
      key: qrKey,
      onQRViewCreated: _onQRViewCreated,
      overlay: QrScannerOverlayShape(
        borderColor: Colors.red,
        borderRadius: 10,
        borderLength: 30,
        borderWidth: 10,
        cutOutSize: scanArea,
      ),
      onPermissionSet: (ctrl, p) => _onPermissionSet(context, ctrl, p),
    );
  }

  void _onQRViewCreated(QRViewController controller) {
    setState(() {
      this.controller = controller;
    });
    controller.scannedDataStream.listen((scanData) {
      setState(() {
        result = scanData;
      });
      _cekUndangan(scanData.code!);
    });
  }

  _cekUndangan(String code) async {
    final undangan = await ApiUndangan.cekUndangan(code);

    if (undangan != null) {
      final undanganProvider = Provider.of<UndanganProvider>(context);
      undanganProvider.undangan = undangan;

      Navigator.push(context, MaterialPageRoute(builder: (_) => Dasboard()));
    } else {
      setState(() {
        result = null;
      });
    }
  }

  void _onPermissionSet(BuildContext context, QRViewController ctrl, bool p) {
    log('${DateTime.now().toIso8601String()}_onPermissionSet $p');
    if (!p) {
      ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar(content: Text('no Permission')),
      );
    }
  }

  @override
  void dispose() {
    controller?.dispose();
    super.dispose();
  }
}