Merge pull request #231 from MichaelOrpheo/master

feat: Add permission callback

@@ -9,6 +9,9 @@ class MobileScanner extends StatefulWidget {
   /// The controller of the camera.
   final MobileScannerController? controller;
 
+  /// Calls the provided [onPermissionSet] callback when the permission is set.
+  final Function(bool permissionGranted)? onPermissionSet;
+
   /// Function that gets called when a Barcode is detected.
   ///
   /// [barcode] The barcode object with all information about the scanned code.
@@ -34,6 +37,7 @@ class MobileScanner extends StatefulWidget {
     this.controller,
     this.fit = BoxFit.cover,
     this.allowDuplicates = false,
+    this.onPermissionSet,
   });
 
   @override
@@ -48,7 +52,8 @@ class _MobileScannerState extends State<MobileScanner>
   void initState() {
     super.initState();
     WidgetsBinding.instance.addObserver(this);
-    controller = widget.controller ?? MobileScannerController();
+    controller = widget.controller ??
+        MobileScannerController(onPermissionSet: widget.onPermissionSet);
     if (!controller.isStarting) controller.start();
   }
 
@@ -118,7 +123,8 @@ class _MobileScannerState extends State<MobileScanner>
       }
     } else {
       if (widget.controller == null) {
-        controller = MobileScannerController();
+        controller =
+            MobileScannerController(onPermissionSet: widget.onPermissionSet);
       } else if (oldWidget.controller != widget.controller) {
         controller = widget.controller!;
       }

@@ -39,6 +39,7 @@ class MobileScannerController {
   static int? _controllerHashcode;
   StreamSubscription? events;
 
+  Function(bool permissionGranted)? onPermissionSet;
   final ValueNotifier<MobileScannerArguments?> args = ValueNotifier(null);
   final ValueNotifier<TorchState> torchState = ValueNotifier(TorchState.off);
   late final ValueNotifier<CameraFacing> cameraFacingState;
@@ -66,6 +67,7 @@ class MobileScannerController {
     this.ratio,
     this.torchEnabled,
     this.formats,
+    this.onPermissionSet,
     this.autoResume = true,
     this.returnImage = false,
   }) {
@@ -156,11 +158,14 @@ class MobileScannerController {
           state = result
               ? MobileScannerState.authorized
               : MobileScannerState.denied;
+          onPermissionSet?.call(result);
           break;
         case MobileScannerState.denied:
           isStarting = false;
+          onPermissionSet?.call(false);
           throw PlatformException(code: 'NO ACCESS');
         case MobileScannerState.authorized:
+          onPermissionSet?.call(true);
           break;
       }
     }
@@ -192,6 +197,9 @@ class MobileScannerController {
     } on PlatformException catch (error) {
       debugPrint('${error.code}: ${error.message}');
       isStarting = false;
+      if (error.code == "MobileScannerWeb") {
+        onPermissionSet?.call(false);
+      }
       // setAnalyzeMode(AnalyzeMode.none.index);
       return;
     }
@@ -204,6 +212,10 @@ class MobileScannerController {
     hasTorch = startResult['torchable'] as bool? ?? false;
 
     if (kIsWeb) {
+      onPermissionSet?.call(
+        true,
+      ); // If we reach this line, it means camera permission has been granted
+
       args.value = MobileScannerArguments(
         webId: startResult['ViewID'] as String?,
         size: Size(
@@ -287,6 +299,7 @@ class MobileScannerController {
       events?.cancel();
       events = null;
       _controllerHashcode = null;
+      onPermissionSet = null;
     }
     barcodesController.close();
   }