Handle condition where camera controller fails to initialize

lib/barcode/camera_controller.dart

@@ -1,10 +1,14 @@
 import "dart:math";
 import "dart:typed_data";
 
+import "package:camera/camera.dart";
 import "package:flutter/material.dart";
 import "package:flutter_tabler_icons/flutter_tabler_icons.dart";
 import "package:inventree/app_colors.dart";
+import "package:inventree/inventree/sentry.dart";
 import "package:inventree/preferences.dart";
+import "package:inventree/widget/snacks.dart";
+import "package:one_context/one_context.dart";
 import "package:wakelock_plus/wakelock_plus.dart";
 import "package:flutter_zxing/flutter_zxing.dart";
 
@@ -133,7 +137,28 @@ class _CameraBarcodeControllerState extends InvenTreeBarcodeControllerState {
         }
       });
     }
+  }
 
+  void onControllerCreated(CameraController? controller, Exception? error) {
+    if (error != null) {
+      sentryReportError(
+        "CameraBarcodeController.onControllerCreated",
+        error,
+        null
+      );
+    }
+
+    if (controller == null) {
+      showSnackIcon(
+        L10().cameraCreationError,
+        icon: TablerIcons.camera_x,
+        success: false
+      );
+
+      if (OneContext.hasContext) {
+        Navigator.pop(OneContext().context!);
+      }
+    }
   }
 
   /*
@@ -167,6 +192,7 @@ class _CameraBarcodeControllerState extends InvenTreeBarcodeControllerState {
       tryInverted: true,
       tryRotate: true,
       showGallery: false,
+      onControllerCreated: onControllerCreated,
       scanDelay: Duration(milliseconds: scan_delay),
       resolution: ResolutionPreset.high,
       lensDirection: CameraLensDirection.back,

lib/l10n/app_en.arb

@@ -202,6 +202,9 @@
   "building": "Building",
   "@building": {},
 
+  "cameraCreationError": "Could not open camera controller",
+  "@cameraCreationError": {},
+
   "cameraInternal": "Internal Camera",
   "@cameraInternal": {},
 

lib/widget/snacks.dart

@@ -72,7 +72,7 @@ void showSnackIcon(String text, {IconData? icon, Function()? onAction, bool? suc
         onAction();
       }
     ),
-    duration: Duration(seconds: onAction == null ? 1 : 2),
+    duration: Duration(seconds: onAction == null ? 5 : 10),
     )
   );