mymuseum-visitapp/lib/Components/ScannerDialog.dart

import 'package:flutter/material.dart';
import 'package:mymuseum_visitapp/Screens/Scanner/scanner.dart';
import 'dart:io';
import 'package:flutter/foundation.dart';
import 'package:flutter/material.dart';
import 'package:mymuseum_visitapp/Components/CustomAppBar.dart';
import 'package:mymuseum_visitapp/Screens/Article/article.dart';
import 'package:qr_code_scanner/qr_code_scanner.dart';


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

  @override
  State<ScannerTEST> createState() => _ScannerTESTState();
}

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

  // In order to get hot reload to work we need to pause the camera if the platform
  // is android, or resume the camera if the platform is iOS.
  @override
  void reassemble() {
    print("reassemble ");
    super.reassemble();
    if (Platform.isAndroid) {
      controller!.pauseCamera();
    }
    controller!.resumeCamera();
  }

  @override
  Widget build(BuildContext context) {
    Size size = MediaQuery.of(context).size;
    return Container(
      height: size.height *0.6,
      width: size.width *0.9,
      color: Colors.blueAccent,
      child: Column(
        children: <Widget>[
          Expanded(flex: 4, child: _buildQrView(context)),
          Expanded(
            flex: 1,
            child: FittedBox(
              fit: BoxFit.contain,
              child: Column(
                mainAxisAlignment: MainAxisAlignment.spaceEvenly,
                children: <Widget>[
                  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 Icon(Icons.flash_on);
                              },
                            )),
                      ),
                      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 {
                            print(controller);
                            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)
        ? 225.0
        : 300.0;
    // 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.blueAccent,
          borderRadius: 10,
          borderLength: 25,
          borderWidth: 5,
          cutOutSize: 225.0),
      onPermissionSet: (ctrl, p) => _onPermissionSet(context, ctrl, p),
    );
  }

  void _onQRViewCreated(QRViewController controller) {
    setState(() {
      this.controller = controller;
    });
    if (Platform.isAndroid) {
      controller!.pauseCamera();
    }
    controller!.resumeCamera();
    controller.scannedDataStream.listen((scanData) {
      setState(() {
        result = scanData;
        print(result);
        print(result!.code.toString());
        var code = result == null ? "" : result!.code.toString();
        if(result!.format == BarcodeFormat.qrcode) {
          controller.pauseCamera();
          print("QR CODE FOUND");
          ScaffoldMessenger.of(context).showSnackBar(
            SnackBar(content: Text('QR CODE FOUND - ${code.toString()}')),
          );

          // TODO search in local if data == Id of Article
          //Navigator.of(context).pop();

          // If so, navigate to article view
          Navigator.pushReplacement(
            context,
            MaterialPageRoute(
              builder: (context) {
                return ArticlePage(articleId: code);
              },
            ),
          );

          //Navigator.of(context).pop();
        }
      });
    });
  }

  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();
  }
}

showScannerDialog (String question, BuildContext context) {
  showDialog(
      builder: (BuildContext context) => AlertDialog(
        shape: const RoundedRectangleBorder(
            borderRadius: BorderRadius.all(Radius.circular(10.0))
        ),
        content: ScannerTEST(
        ),
        contentPadding: EdgeInsets.zero,
      ), context: context
  );
}