Updated barcode_format.dart to null-safety.

lib/src/qr_code_scanner.dart

@@ -185,12 +185,12 @@ class QRViewController {
         case 'onRecognizeQR':
           if (call.arguments != null) {
             final args = call.arguments as Map;
-            final code = args['code'] as String?;
-            final rawType = args['type'] as String?;
+            final code = args['code'] as String;
+            final rawType = args['type'] as String;
             // Raw bytes are only supported by Android.
             final rawBytes = args['rawBytes'] as List<int>?;
             final format = BarcodeTypesExtension.fromString(rawType);
-            if (format != null) {
+            if (format != BarcodeFormat.unknown) {
               final barcode = Barcode(code, format, rawBytes);
               _scanUpdateController.sink.add(barcode);
             } else {

lib/src/qr_scanner_overlay_shape.dart

@@ -11,10 +11,7 @@ class QrScannerOverlayShape extends ShapeBorder {
     this.borderLength = 40,
     this.cutOutSize = 250,
     this.cutOutBottomOffset = 0,
-  }) : assert(
-            cutOutSize != null ??
-                cutOutSize != null ??
-                borderLength <= cutOutSize / 2 + borderWidth * 2,
+  }) : assert( borderLength <= cutOutSize / 2 + borderWidth * 2,
             "Border can't be larger than ${cutOutSize / 2 + borderWidth * 2}");
 
   final Color borderColor;
@@ -68,7 +65,7 @@ class QrScannerOverlayShape extends ShapeBorder {
     final _borderLength = borderLength > cutOutSize / 2 + borderWidth * 2
         ? borderWidthSize / 2
         : borderLength;
-    final _cutOutSize = cutOutSize != null && cutOutSize < width
+    final _cutOutSize = cutOutSize < width
         ? cutOutSize
         : width - borderOffset;
 

lib/src/types/barcode_format.dart

@@ -53,7 +53,10 @@ enum BarcodeFormat {
   upcE,
 
   /// UPC/EAN extension format. Not a stand-alone format.
-  upcEanExtension
+  upcEanExtension,
+
+  /// Unknown
+  unknown
 }
 
 extension BarcodeTypesExtension on BarcodeFormat {
@@ -61,61 +64,44 @@ extension BarcodeTypesExtension on BarcodeFormat {
     return index;
   }
 
-  static BarcodeFormat? fromString(String? format) {
+  static BarcodeFormat fromString(String format) {
     switch (format) {
       case 'AZTEC':
         return BarcodeFormat.aztec;
-        break;
       case 'CODABAR':
         return BarcodeFormat.codabar;
-        break;
       case 'CODE_39':
         return BarcodeFormat.code39;
-        break;
       case 'CODE_93':
         return BarcodeFormat.code93;
-        break;
       case 'CODE_128':
         return BarcodeFormat.code128;
-        break;
       case 'DATA_MATRIX':
         return BarcodeFormat.dataMatrix;
-        break;
       case 'EAN_8':
         return BarcodeFormat.ean8;
-        break;
       case 'EAN_13':
         return BarcodeFormat.ean13;
-        break;
       case 'ITF':
         return BarcodeFormat.itf;
-        break;
       case 'MAXICODE':
         return BarcodeFormat.maxicode;
-        break;
       case 'PDF_417':
         return BarcodeFormat.pdf417;
-        break;
       case 'QR_CODE':
         return BarcodeFormat.qrcode;
-        break;
       case 'RSS14':
         return BarcodeFormat.rss14;
-        break;
       case 'RSS_EXPANDED':
         return BarcodeFormat.rssExpanded;
-        break;
       case 'UPC_A':
         return BarcodeFormat.upcA;
-        break;
       case 'UPC_E':
         return BarcodeFormat.upcE;
-        break;
       case 'UPC_EAN_EXTENSION':
         return BarcodeFormat.upcEanExtension;
-        break;
       default:
-        return null;
+        return BarcodeFormat.unknown;
     }
   }
 
@@ -123,57 +109,40 @@ extension BarcodeTypesExtension on BarcodeFormat {
     switch (this) {
       case BarcodeFormat.aztec:
         return 'AZTEC';
-        break;
       case BarcodeFormat.codabar:
         return 'CODABAR';
-        break;
       case BarcodeFormat.code39:
         return 'CODE_39';
-        break;
       case BarcodeFormat.code93:
         return 'CODE_93';
-        break;
       case BarcodeFormat.code128:
         return 'CODE_128';
-        break;
       case BarcodeFormat.dataMatrix:
         return 'DATA_MATRIX';
-        break;
       case BarcodeFormat.ean8:
         return 'EAN_8';
-        break;
       case BarcodeFormat.ean13:
         return 'EAN_13';
-        break;
       case BarcodeFormat.itf:
         return 'ITF';
-        break;
       case BarcodeFormat.maxicode:
         return 'MAXICODE';
-        break;
       case BarcodeFormat.pdf417:
         return 'PDF_417';
-        break;
       case BarcodeFormat.qrcode:
         return 'QR_CODE';
-        break;
       case BarcodeFormat.rss14:
         return 'RSS14';
-        break;
       case BarcodeFormat.rssExpanded:
         return 'RSS_EXPANDED';
-        break;
       case BarcodeFormat.upcA:
         return 'UPC_A';
-        break;
       case BarcodeFormat.upcE:
         return 'UPC_E';
-        break;
       case BarcodeFormat.upcEanExtension:
         return 'UPC_EAN_EXTENSION';
-        break;
       default:
-        return 'NOT_VALID';
+        return 'UNKNOWN';
     }
   }
 }