Scan QR code now working!

- Navigate to a StockLocation

lib/barcode.dart

@@ -0,0 +1,52 @@
+import 'package:flutter/cupertino.dart';
+import 'package:flutter/material.dart';
+import 'package:qr_utils/qr_utils.dart';
+
+import 'package:InvenTree/inventree/stock.dart';
+import 'package:InvenTree/widget/location_display.dart';
+
+import 'dart:convert';
+
+void scanQrCode(BuildContext context) async {
+
+  QrUtils.scanQR.then((String result) {
+    // Look for JSON data in the result...
+    final data = json.decode(result);
+
+    final String tool = (data['tool'] ?? '').toString().toLowerCase();
+
+    // This looks like an InvenTree QR code!
+    if (tool == 'inventree') {
+      final String codeType = (data['type'] ?? '').toString().toLowerCase();
+
+      final int pk = (data['id'] ?? -1) as int;
+
+      if (codeType == 'stocklocation') {
+
+        // Try to open a stock location...
+        InvenTreeStockLocation().get(pk).then((var loc) {
+          if (loc is InvenTreeStockLocation) {
+            Navigator.push(context, MaterialPageRoute(builder: (context) => LocationDisplayWidget(loc)));
+          }
+        });
+
+      } else if (codeType == 'stockitem') {
+
+      }
+
+
+    } else {
+     showDialog(
+       context: context,
+       child: new SimpleDialog(
+         title: new Text("Unknown barcode"),
+         children: <Widget>[
+           Text("Data: $result"),
+         ]
+       )
+     );
+    }
+
+    print("Scanned: $result");
+  });
+}