From 4455cf83027b6d5b736ce1c0b6e973608f4dc3fe Mon Sep 17 00:00:00 2001
From: Akshay Kalbhor <akshaykalbhor52@gmail.com>
Date: Tue, 16 Nov 2021 22:11:47 +0530
Subject: [PATCH] add invert scan feature for android

---
 .../kotlin/net/touchcapture/qr/flutterqr/QRView.kt   |  9 +++++++++
 lib/src/qr_code_scanner.dart                         | 12 ++++++++++++
 2 files changed, 21 insertions(+)

diff --git a/android/src/main/kotlin/net/touchcapture/qr/flutterqr/QRView.kt b/android/src/main/kotlin/net/touchcapture/qr/flutterqr/QRView.kt
index 3578f44..bef7b31 100644
--- a/android/src/main/kotlin/net/touchcapture/qr/flutterqr/QRView.kt
+++ b/android/src/main/kotlin/net/touchcapture/qr/flutterqr/QRView.kt
@@ -90,6 +90,7 @@ class QRView(private val context: Context, messenger: BinaryMessenger, private v
                 call.argument<Double>("cutOutBottomOffset")!!,
                 result,
             )
+            "invertScan" -> setInvertScan(call.argument<Boolean>("isInvertScan")!!, result)
             else -> result.notImplemented()
         }
     }
@@ -259,6 +260,14 @@ class QRView(private val context: Context, messenger: BinaryMessenger, private v
         result.success(true)
     }
 
+    private fun setInvertScan(isInvert: Boolean, result: MethodChannel.Result) {
+        barcodeView!!.pause()
+        val settings = barcodeView!!.cameraSettings
+        settings.isScanInverted = isInvert
+        barcodeView!!.cameraSettings = settings
+        barcodeView!!.resume();
+    }
+
     private fun setScanAreaSize(
         dpScanAreaWidth: Double,
         dpScanAreaHeight: Double,
diff --git a/lib/src/qr_code_scanner.dart b/lib/src/qr_code_scanner.dart
index e675289..8627b8b 100644
--- a/lib/src/qr_code_scanner.dart
+++ b/lib/src/qr_code_scanner.dart
@@ -357,4 +357,16 @@ class QRViewController {
     }
     return false;
   }
+
+  //Starts/Stops invert scanning.
+  Future<void> scanInvert(bool isScanInvert) async {
+    if (defaultTargetPlatform == TargetPlatform.android) {
+      try {
+        await _channel
+            .invokeMethod('invertScan', {"isInvertScan": isScanInvert});
+      } on PlatformException catch (e) {
+        throw CameraException(e.code, e.message);
+      }
+    }
+  }
 }