working android implementation

@@ -5,6 +5,7 @@ import android.app.Activity
 import android.content.pm.PackageManager
 import android.graphics.Point
 import android.graphics.Rect
+import android.graphics.RectF
 import android.net.Uri
 import android.util.Log
 import android.util.Size
@@ -27,6 +28,7 @@ import io.flutter.plugin.common.MethodChannel
 import io.flutter.plugin.common.PluginRegistry
 import io.flutter.view.TextureRegistry
 import java.io.File
+import kotlin.math.roundToInt
 
 
 class MobileScanner(private val activity: Activity, private val textureRegistry: TextureRegistry)
@@ -43,7 +45,7 @@ class MobileScanner(private val activity: Activity, private val textureRegistry:
     private var camera: Camera? = null
     private var preview: Preview? = null
     private var textureEntry: TextureRegistry.SurfaceTextureEntry? = null
-    private var scanWindow: Rect? = null;
+    private var scanWindow: List<Float>? = null;
 
 //    @AnalyzeMode
 //    private var analyzeMode: Int = AnalyzeMode.NONE
@@ -128,27 +130,23 @@ class MobileScanner(private val activity: Activity, private val textureRegistry:
 
     private var scanner = BarcodeScanning.getClient()
 
-
     private fun updateScanWindow(call: MethodCall) {
-        val scanWindowData: List<Int>? = call.argument("rect")
-        if(scanWindowData == null) return
-            
-        scanWindow = Rect(scanWindowData!![0], scanWindowData!![1], scanWindowData!![2], scanWindowData!![3])
+        scanWindow = call.argument<List<Float>>("rect")
     }
 
     // scales the scanWindow to the provided inputImage and checks if that scaled
     // scanWindow contains the barcode
-    private fun isbarCodeInScanWindow(scanWindow: Rect, barcode: Barcode, inputImage: InputImage): Boolean {
+    private fun isbarCodeInScanWindow(scanWindow: List<Float>, barcode: Barcode, inputImage: InputImage): Boolean {
         val barcodeBoundingBox = barcode.getBoundingBox()
         if(barcodeBoundingBox == null) return false
 
         val imageWidth = inputImage.getWidth();
         val imageHeight = inputImage.getHeight();
 
-        val left = scanWindow.left * imageWidth
-        val top = scanWindow.top * imageHeight
-        val right = scanWindow.right * imageWidth
-        val bottom = scanWindow.bottom * imageHeight
+        val left = (scanWindow[0] * imageWidth).roundToInt()
+        val top = (scanWindow[1] * imageHeight).roundToInt()
+        val right = (scanWindow[2] * imageWidth).roundToInt()
+        val bottom = (scanWindow[3] * imageHeight).roundToInt()
 
         val scaledScanWindow = Rect(left, top, right, bottom)
         return scaledScanWindow.contains(barcodeBoundingBox)

@@ -35,7 +35,7 @@ class _BarcodeScannerWithScanWindowState
     );
 
     controller = MobileScannerController(
-      torchEnabled: true,
+      torchEnabled: false,
     );
   }
 

@@ -93,19 +93,19 @@ class _MobileScannerState extends State<MobileScanner>
     final fittedSizes = applyBoxFit(fit, textureSize, widgetSize);
     final fittedTextureSize = fittedSizes.destination;
     
+    /// create a new rectangle that represents the texture on the screen
     final minX = widgetSize.width / 2 - fittedTextureSize.width / 2;
     final minY = widgetSize.height / 2 - fittedTextureSize.height / 2;
     final width = fittedTextureSize.width;
     final height = fittedTextureSize.height;
-
     final textureWindow = Rect.fromLTWH(minX, minY, width, height);
 
-    /// create a new scan window and with only the area of the rect intersecting the texture
+    /// create a new scan window and with only the area of the rect intersecting the texture window
     final scanWindowInTexture = scanWindow.intersect(textureWindow);
 
     /// update the scanWindow left and top to be relative to the texture not the widget
-    final newLeft = scanWindowInTexture.left - minX;
-    final newTop = scanWindowInTexture.top - minY;
+    final newLeft = scanWindowInTexture.left - textureWindow.left;
+    final newTop = scanWindowInTexture.top - textureWindow.top;
     final newWidth = scanWindowInTexture.width;
     final newHeight = scanWindowInTexture.height;
 
@@ -114,8 +114,8 @@ class _MobileScannerState extends State<MobileScanner>
 
     /// get the scanWindow as a percentage of the texture
     final percentageLeft = windowInTexture.left / fittedTextureSize.width;
-    final percentageRight = windowInTexture.right / fittedTextureSize.width;
     final percentageTop = windowInTexture.top / fittedTextureSize.height;
+    final percentageRight = windowInTexture.right / fittedTextureSize.width;
     final percentagebottom = windowInTexture.bottom / fittedTextureSize.height;
 
     /// this rectangle can be send to native code and used to cut out a rectangle of the scan image
@@ -145,16 +145,15 @@ class _MobileScannerState extends State<MobileScanner>
                   value.size,
                   Size(constraints.maxWidth, constraints.maxHeight),
                 );
-                print(window);
+
                 controller.updateScanWindow(window);
               }
 
               controller.barcodes.listen((barcode) {
                 if (!widget.allowDuplicates) {
-                  if (lastScanned != barcode.rawValue) {
+                  if (lastScanned == barcode.rawValue) return;
                   lastScanned = barcode.rawValue;
                   widget.onDetect(barcode, value! as MobileScannerArguments);
-                  }
                 } else {
                   widget.onDetect(barcode, value! as MobileScannerArguments);
                 }