[qr-code-scanner] add functionality to check for duplicates in scanne…

…d values

Signed-off-by: Ritesh Khadse <[email protected]>

.gitignore

@@ -81,3 +81,5 @@ build/
 !**/ios/**/default.pbxuser
 !**/ios/**/default.perspectivev3
 
+# FVM Version Cache
+.fvm/

example/pubspec.lock

@@ -408,10 +408,10 @@ packages:
     dependency: transitive
     description:
       name: firebase_messaging
-      sha256: "199fe8186a5370d1cf5ce0819191079afc305914e8f38715f5e23943940dfe2d"
+      sha256: "980259425fa5e2afc03e533f33723335731d21a56fd255611083bceebf4373a8"
       url: "https://pub.dev"
     source: hosted
-    version: "14.7.9"
+    version: "14.7.10"
   firebase_messaging_platform_interface:
     dependency: transitive
     description:
@@ -1380,10 +1380,10 @@ packages:
     dependency: transitive
     description:
       name: url_launcher_platform_interface
-      sha256: f099b552bd331eacd69affed7ff2f23bfa6b0cb825b629edf3d844375a7501ad
+      sha256: "552f8a1e663569be95a8190206a38187b531910283c3e982193e4f2733f01029"
       url: "https://pub.dev"
     source: hosted
-    version: "2.2.1"
+    version: "2.3.2"
   url_launcher_web:
     dependency: transitive
     description:

lib/src/widgets/qr_code_scanner/qr_code_scanner.dart

@@ -1,12 +1,15 @@
 import 'dart:io';
 
+import 'package:fa_flutter_core/fa_flutter_core.dart';
 import 'package:flutter/material.dart';
 import 'package:qr_code_scanner/qr_code_scanner.dart';
 
 class QrCodeScanner extends StatefulWidget {
-  const QrCodeScanner({Key? key, this.validationRegex}) : super(key: key);
+  const QrCodeScanner({Key? key, this.validationRegex, this.scannedValues})
+      : super(key: key);
 
   final String? validationRegex;
+  final List<String>? scannedValues;
 
   @override
   State<QrCodeScanner> createState() => _QrScannerState();
@@ -149,6 +152,22 @@ class _QrScannerState extends State<QrCodeScanner> {
       } else {
         throw Exception("Scanned data is empty");
       }
+
+      //incase of unique scans.
+      if (checkIfListIsNotEmpty(widget.scannedValues)) {
+        if (widget.scannedValues!.contains(dataToReturn)) {
+          ScaffoldMessenger.of(context).clearSnackBars();
+          ScaffoldMessenger.of(context).showSnackBar(
+            SnackBar(
+              content: Text(
+                "You have already scanned this QR code.",
+              ),
+            ),
+          );
+          return;
+        }
+      }
+
       Navigator.pop(context, dataToReturn);
     }
   }