feat: update web integration

+import 'dart:async';
+
+import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
+import 'package:flutter_web_plugins/flutter_web_plugins.dart';
+import 'package:mobile_scanner/mobile_scanner.dart';
+import 'package:mobile_scanner/src/web/jsqr.dart';
+import 'dart:html' as html;
+import 'dart:ui' as ui;
+
+import 'package:mobile_scanner/src/web/media.dart';
+
+/// This plugin is the web implementation of mobile_scanner.
+/// It only supports QR codes.
+class MobileScannerWebPlugin {
+  static void registerWith(Registrar registrar) {
+    PluginEventChannel event = PluginEventChannel(
+        'dev.steenbakker.mobile_scanner/scanner/event',
+        const StandardMethodCodec(),
+        registrar);
+    MethodChannel channel = MethodChannel(
+        'dev.steenbakker.mobile_scanner/scanner/method',
+        const StandardMethodCodec(),
+        registrar);
+    final MobileScannerWebPlugin instance = MobileScannerWebPlugin();
+    WidgetsFlutterBinding.ensureInitialized();
+
+    channel.setMethodCallHandler(instance.handleMethodCall);
+    event.setController(instance.controller);
+  }
+
+  // Controller to send events back to the framework
+  StreamController controller = StreamController();
+
+  // The video stream. Will be initialized later to see which camera needs to be used.
+  html.MediaStream? _localStream;
+  html.VideoElement video = html.VideoElement();
+
+  // ID of the video feed
+  String viewID = 'WebScanner-${DateTime.now().millisecondsSinceEpoch}';
+
+  // Determine wether device has flas
+  bool hasFlash = false;
+
+  // Timer used to capture frames to be analyzed
+  Timer? _frameInterval;
+
+  html.DivElement vidDiv = html.DivElement();
+
+  /// Handle incomming messages
+  Future<dynamic> handleMethodCall(MethodCall call) async {
+    switch (call.method) {
+      case 'start':
+        return await _start(call.arguments);
+      case 'torch':
+        return await _torch(call.arguments);
+      case 'stop':
+        return await cancel();
+      default:
+        throw PlatformException(
+            code: 'Unimplemented',
+            details: "The mobile_scanner plugin for web doesn't implement "
+                "the method '${call.method}'");
+    }
+  }
+
+  /// Can enable or disable the flash if available
+  Future<void> _torch(arguments) async {
+    if (hasFlash) {
+      final track = _localStream?.getVideoTracks();
+      await track!.first.applyConstraints({
+        'advanced': {'torch': arguments == 1}
+      });
+    } else {
+      controller.addError('Device has no flash');
+    }
+  }
+
+  /// Starts the video stream and the scanner
+  Future<Map> _start(arguments) async {
+    vidDiv.children = [video];
+
+    final CameraFacing cameraFacing =
+        arguments['cameraFacing'] ?? CameraFacing.front;
+
+    // See https://github.com/flutter/flutter/issues/41563
+    // ignore: UNDEFINED_PREFIXED_NAME
+    ui.platformViewRegistry.registerViewFactory(
+        viewID,
+        (int id) => vidDiv
+          ..style.width = '100%'
+          ..style.height = '100%');
+
+    // Check if stream is running
+    if (_localStream != null) {
+      return {
+        'ViewID': viewID,
+        'videoWidth': video.videoWidth,
+        'videoHeight': video.videoHeight
+      };
+    }
+
+    try {
+      // Check if browser supports multiple camera's and set if supported
+      Map? capabilities =
+          html.window.navigator.mediaDevices?.getSupportedConstraints();
+      if (capabilities != null && capabilities['facingMode']) {
+        UserMediaOptions constraints = UserMediaOptions(
+            video: VideoOptions(
+          facingMode:
+              (cameraFacing == CameraFacing.front ? 'user' : 'environment'),
+          width: {'ideal': 4096},
+          height: {'ideal': 2160},
+        ));
+
+        _localStream =
+            await html.window.navigator.getUserMedia(video: constraints);
+      } else {
+        _localStream = await html.window.navigator.getUserMedia(video: true);
+      }
+
+      video.srcObject = _localStream;
+
+      // TODO: fix flash light. See https://github.com/dart-lang/sdk/issues/48533
+      // final track = _localStream?.getVideoTracks();
+      // if (track != null) {
+      //   final imageCapture = html.ImageCapture(track.first);
+      //   final photoCapabilities = await imageCapture.getPhotoCapabilities();
+      // }
+
+      // required to tell iOS safari we don't want fullscreen
+      video.setAttribute('playsinline', 'true');
+
+      await video.play();
+
+      // Then capture a frame to be analyzed every 200 miliseconds
+      _frameInterval =
+          Timer.periodic(const Duration(milliseconds: 200), (timer) {
+        _captureFrame();
+      });
+
+      return {
+        'ViewID': viewID,
+        'videoWidth': video.videoWidth,
+        'videoHeight': video.videoHeight,
+        'torchable': hasFlash
+      };
+    } catch (e) {
+      throw PlatformException(code: 'MobileScannerWeb', message: e.toString());
+    }
+  }
+
+  /// Check if any camera's are available
+  static Future<bool> cameraAvailable() async {
+    final sources =
+        await html.window.navigator.mediaDevices!.enumerateDevices();
+    for (final e in sources) {
+      if (e.kind == 'videoinput') {
+        return true;
+      }
+    }
+    return false;
+  }
+
+  /// Stops the video feed and analyzer
+  Future<void> cancel() async {
+    try {
+      // Stop the camera stream
+      _localStream!.getTracks().forEach((track) {
+        if (track.readyState == 'live') {
+          track.stop();
+        }
+      });
+    } catch (e) {
+      debugPrint('Failed to stop stream: $e');
+    }
+
+    video.srcObject = null;
+    _localStream = null;
+    _frameInterval?.cancel();
+    _frameInterval = null;
+  }
+
+  /// Captures a frame and analyzes it for QR codes
+  Future<dynamic> _captureFrame() async {
+    if (_localStream == null) return null;
+    final canvas =
+        html.CanvasElement(width: video.videoWidth, height: video.videoHeight);
+    final ctx = canvas.context2D;
+
+    ctx.drawImage(video, 0, 0);
+    final imgData = ctx.getImageData(0, 0, canvas.width!, canvas.height!);
+
+    final code = jsQR(imgData.data, canvas.width, canvas.height);
+    if (code != null) {
+      controller.add({'name': 'barcodeWeb', 'data': code.data});
+    }
+  }
+}

@@ -2,10 +2,6 @@ import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:mobile_scanner/mobile_scanner.dart';
 
-import 'mobile_scanner_arguments.dart';
-
-import  'web/flutter_qr_web.dart';
-
 enum Ratio { ratio_4_3, ratio_16_9 }
 
 /// A widget showing a live camera preview.
@@ -64,12 +60,6 @@ class _MobileScannerState extends State<MobileScanner>
 
   @override
   Widget build(BuildContext context) {
-    if (kIsWeb) {
-      return WebScanner(
-        onDetect: (barcode) => widget.onDetect!(barcode, null),
-        cameraFacing: CameraFacing.back,
-      );
-    } else {
       return LayoutBuilder(builder: (context, BoxConstraints constraints) {
         return ValueListenableBuilder(
             valueListenable: controller.args,
@@ -96,7 +86,7 @@ class _MobileScannerState extends State<MobileScanner>
                       child: SizedBox(
                         width: value.size.width,
                         height: value.size.height,
-                        child: Texture(textureId: value.textureId),
+                        child: kIsWeb ? HtmlElementView(viewType: value.webId!) : Texture(textureId: value.textureId!),
                       ),
                     ),
                   ),
@@ -105,7 +95,6 @@ class _MobileScannerState extends State<MobileScanner>
             });
       });
     }
-  }
 
   @override
   void didUpdateWidget(covariant MobileScanner oldWidget) {

@@ -3,14 +3,16 @@ import 'package:flutter/material.dart';
 /// Camera args for [CameraView].
 class MobileScannerArguments {
   /// The texture id.
-  final int textureId;
+  final int? textureId;
 
   /// Size of the texture.
   final Size size;
 
   final bool hasTorch;
 
+  final String? webId;
+
   /// Create a [MobileScannerArguments].
   MobileScannerArguments(
-      {required this.textureId, required this.size, required this.hasTorch});
+      {this.textureId, required this.size, required this.hasTorch, this.webId});
 }

@@ -2,6 +2,7 @@ import 'dart:async';
 import 'dart:io';
 
 import 'package:flutter/cupertino.dart';
+import 'package:flutter/foundation.dart';
 import 'package:flutter/services.dart';
 import 'package:mobile_scanner/mobile_scanner.dart';
 
@@ -98,6 +99,9 @@ class MobileScannerController {
       case 'barcodeMac':
         barcodesController.add(Barcode(rawValue: data['payload']));
         break;
+      case 'barcodeWeb':
+        barcodesController.add(Barcode(rawValue: data));
+        break;
       default:
         throw UnimplementedError();
     }
@@ -125,13 +129,15 @@ class MobileScannerController {
     // setAnalyzeMode(AnalyzeMode.barcode.index);
 
     // Check authorization status
+    if (!kIsWeb) {
       MobileScannerState state =
           MobileScannerState.values[await methodChannel.invokeMethod('state')];
       switch (state) {
         case MobileScannerState.undetermined:
           final bool result = await methodChannel.invokeMethod('request');
-        state =
-            result ? MobileScannerState.authorized : MobileScannerState.denied;
+          state = result
+              ? MobileScannerState.authorized
+              : MobileScannerState.denied;
           break;
         case MobileScannerState.denied:
           isStarting = false;
@@ -139,6 +145,7 @@ class MobileScannerController {
         case MobileScannerState.authorized:
           break;
       }
+    }
 
     cameraFacingState.value = facing;
 
@@ -174,10 +181,20 @@ class MobileScannerController {
     }
 
     hasTorch = startResult['torchable'];
+
+    if (kIsWeb) {
+      args.value = MobileScannerArguments(
+          webId: startResult['ViewID'],
+          size: Size(startResult['videoWidth'], startResult['videoHeight']),
+          hasTorch: hasTorch);
+    } else {
+
       args.value = MobileScannerArguments(
           textureId: startResult['textureId'],
           size: toSize(startResult['size']),
           hasTorch: hasTorch);
+    }
+
     isStarting = false;
   }
 

-// ignore_for_file: avoid_web_libraries_in_flutter
-
-import 'dart:async';
-import 'dart:core';
-import 'dart:html' as html;
-import 'dart:ui' as ui;
-
-import 'package:flutter/material.dart';
-
-import '../../mobile_scanner.dart';
-import 'jsqr.dart';
-import 'media.dart';
-
-/// Even though it has been highly modified, the origial implementation has been
-/// adopted from https://github.com:treeder/jsqr_flutter
-///
-/// Copyright 2020 @treeder
-/// Copyright 2021 The one with the braid
-
-class WebScanner extends StatefulWidget {
-  final Function(Barcode) onDetect;
-  final CameraFacing? cameraFacing;
-
-  const WebScanner(
-      {Key? key,
-      required this.onDetect,
-      this.cameraFacing = CameraFacing.front})
-      : super(key: key);
-
-  @override
-  _WebScannerState createState() => _WebScannerState();
-
-  // need a global for the registerViewFactory
-  static html.DivElement vidDiv = html.DivElement();
-
-  static Future<bool> cameraAvailable() async {
-    final sources =
-        await html.window.navigator.mediaDevices!.enumerateDevices();
-    // List<String> vidIds = [];
-    var hasCam = false;
-    for (final e in sources) {
-      if (e.kind == 'videoinput') {
-        // vidIds.add(e['deviceId']);
-        hasCam = true;
-      }
-    }
-    return hasCam;
-  }
-}
-
-class _WebScannerState extends State<WebScanner> {
-  // Which way the camera is facing
-  // late CameraFacing facing;
-
-  // The camera stream to display to the user
-  html.MediaStream? _localStream;
-
-  // Check if analyzer is processing barcode
-  bool _currentlyProcessing = false;
-
-  // QRViewControllerWeb? _controller;
-
-  // Set size of the webview
-  // Size _size = const Size(0, 0);
-
-  // TODO: Timer for capture?
-  Timer? timer;
-
-  // String? code;
-
-  // TODO: Error message if error
-  String? _errorMsg;
-
-  // Video element to be played on
-  html.VideoElement video = html.VideoElement();
-
-  // ID of the video feed
-  String viewID =
-      'WebScanner-' + DateTime.now().millisecondsSinceEpoch.toString();
-
-  // final StreamController<Barcode> _scanUpdateController =
-  //     StreamController<Barcode>();
-
-  // Timer for interval capture
-  Timer? _frameIntervall;
-
-  @override
-  void initState() {
-    super.initState();
-    // facing = widget.cameraFacing ?? CameraFacing.front;
-    WebScanner.vidDiv.children = [video];
-
-    // ignore: UNDEFINED_PREFIXED_NAME
-    ui.platformViewRegistry
-        .registerViewFactory(viewID, (int id) => WebScanner.vidDiv);
-
-    // giving JavaScipt some time to process the DOM changes
-    Timer(const Duration(milliseconds: 500), () {
-      start();
-    });
-  }
-
-  /// Initialize camera and capture frame
-  Future start() async {
-    await _startVideoStream();
-    _frameIntervall?.cancel();
-    _frameIntervall =
-        Timer.periodic(const Duration(milliseconds: 200), (timer) {
-      _captureFrame();
-    });
-  }
-
-  void cancel() {
-    if (timer != null) {
-      timer!.cancel();
-      timer = null;
-    }
-    if (_currentlyProcessing) {
-      _stopVideoStream();
-    }
-  }
-
-  @override
-  void dispose() {
-    cancel();
-    super.dispose();
-  }
-
-  /// Starts a video stream if not started already
-  Future<void> _startVideoStream() async {
-    // Check if stream is running
-    if (_localStream != null) return;
-
-    try {
-      // Check if browser supports multiple camera's and set if supported
-      Map? capabilities =
-          html.window.navigator.mediaDevices?.getSupportedConstraints();
-      if (capabilities != null && capabilities['facingMode']) {
-        UserMediaOptions constraints = UserMediaOptions(
-            video: VideoOptions(
-          facingMode: (widget.cameraFacing == CameraFacing.front
-              ? 'user'
-              : 'environment'),
-          width: {'ideal': 4096},
-          height: {'ideal': 2160},
-        ));
-
-        _localStream =
-            await html.window.navigator.getUserMedia(video: constraints);
-      } else {
-        _localStream = await html.window.navigator.getUserMedia(video: true);
-      }
-
-      video.srcObject = _localStream;
-
-      // required to tell iOS safari we don't want fullscreen
-      video.setAttribute('playsinline', 'true');
-
-      // TODO: Check controller
-      // if (_controller == null) {
-      //   _controller = QRViewControllerWeb(this);
-      //   widget.onPlatformViewCreated(_controller!);
-      // }
-
-      await video.play();
-    } catch (e) {
-      cancel();
-      setState(() {
-        _errorMsg = e.toString();
-      });
-      return;
-    }
-
-    if (!mounted) return;
-
-    setState(() {
-      _currentlyProcessing = true;
-    });
-  }
-
-  Future<void> _stopVideoStream() async {
-    try {
-      // Stop the camera stream
-      _localStream!.getTracks().forEach((track) {
-        if (track.readyState == 'live') {
-          track.stop();
-        }
-      });
-
-      video.srcObject = null;
-      _localStream = null;
-    } catch (e) {
-      debugPrint('Failed to stop stream: $e');
-    }
-  }
-
-  Future<dynamic> _captureFrame() async {
-    if (_localStream == null) return null;
-    final canvas = html.CanvasElement(width: video.videoWidth, height: video.videoHeight);
-    final ctx = canvas.context2D;
-
-    ctx.drawImage(video, 0, 0);
-    final imgData = ctx.getImageData(0, 0, canvas.width!, canvas.height!);
-
-    // final size =
-    //     Size(canvas.width?.toDouble() ?? 0, canvas.height?.toDouble() ?? 0);
-    // if (size != _size) {
-    //   setState(() {
-    //     _setCanvasSize(size);
-    //   });
-    // }
-    // debugPrint('img.data: ${imgData.data}');
-    final code = jsQR(imgData.data, canvas.width, canvas.height);
-    // ignore: unnecessary_null_comparison
-    if (code != null) {
-      debugPrint('CODE: $code');
-    //   widget.onDetect(Barcode(rawValue: code.data));
-      // print('Barcode: ${code.data}');
-      // _scanUpdateController
-      //     .add(Barcode(rawValue: code.data));
-    }
-  }
-
-  @override
-  Widget build(BuildContext context) {
-    if (_errorMsg != null) {
-      return Center(child: Text(_errorMsg!));
-    }
-    if (_localStream == null) {
-      return const Center(child: CircularProgressIndicator());
-    }
-
-    return SizedBox(
-        width: MediaQuery.of(context).size.width,
-        height: MediaQuery.of(context).size.height,
-        child: FittedBox(
-            child: SizedBox(
-                width: video.videoWidth.toDouble(),
-                height: video.videoHeight.toDouble(),
-                child: HtmlElementView(viewType: viewID))));
-  }
-}

@@ -4,7 +4,7 @@ library jsqr;
 import 'package:js/js.dart';
 
 @JS('jsQR')
-external Code jsQR(var data, int? width, int? height);
+external Code? jsQR(var data, int? width, int? height);
 
 @JS()
 class Code {

@@ -11,6 +11,8 @@ dependencies:
   js: ^0.6.4
   flutter:
     sdk: flutter
+  flutter_web_plugins:
+    sdk: flutter
 
 dev_dependencies:
   flutter_test:
@@ -27,3 +29,6 @@ flutter:
         pluginClass: MobileScannerPlugin
       macos:
         pluginClass: MobileScannerPlugin
+      web:
+        pluginClass: MobileScannerWebPlugin
+        fileName: mobile_scanner_web_plugin.dart
\ No newline at end of file