Add overlay text to barcode scanner view

lib/barcode.dart

@@ -28,6 +28,8 @@ class BarcodeHandler {
    * based on the response returned from the InvenTree server
    */
 
+    String getOverlayText(BuildContext context) => "Barcode Overlay";
+
     BarcodeHandler();
 
     QRViewController _controller;
@@ -132,6 +134,9 @@ class BarcodeScanHandler extends BarcodeHandler {
    * Scan *any* barcode without context, and then redirect app to correct view
    */
 
+  @override
+  String getOverlayText(BuildContext context) => I18N.of(context).barcodeScanGeneral;
+
   @override
   Future<void> onBarcodeUnknown(Map<String, dynamic> data) {
     showErrorDialog(
@@ -220,6 +225,9 @@ class StockItemBarcodeAssignmentHandler extends BarcodeHandler {
 
   StockItemBarcodeAssignmentHandler(this.item);
 
+  @override
+  String getOverlayText(BuildContext context) => I18N.of(context).barcodeScanAssign;
+
   @override
   Future<void> onBarcodeMatched(Map<String, dynamic> data) {
     // If the barcode is known, we can't asisgn it to the stock item!
@@ -324,7 +332,7 @@ class _QRViewState extends State<InvenTreeQRView> {
     this.context = context;
 
     return Scaffold(
-      body: Column(
+      body: Stack(
         children: <Widget>[
           Expanded(
             flex: 4,
@@ -339,6 +347,21 @@ class _QRViewState extends State<InvenTreeQRView> {
                 cutOutSize: 300,
               ),
             )
+          ),
+          Center(
+            child: Column(
+              children: [
+                Spacer(),
+                Padding(
+                  child: Text(_handler.getOverlayText(context),
+                    style: TextStyle(
+                    fontWeight: FontWeight.bold,
+                    color: Colors.white),
+                  ),
+                  padding: EdgeInsets.all(20),
+                ),
+              ]
+            )
           )
         ],
       )
@@ -356,6 +379,9 @@ class StockItemScanIntoLocationHandler extends BarcodeHandler {
 
   StockItemScanIntoLocationHandler(this.item);
 
+  @override
+  String getOverlayText(BuildContext context) => I18N.of(context).barcodeScanLocation;
+
   @override
   Future<void> onBarcodeMatched(Map<String, dynamic> data) {
     // If the barcode points to a 'stocklocation', great!

lib/widget/location_display.dart

@@ -207,10 +207,13 @@ class _LocationDisplayState extends RefreshableState<LocationDisplayWidget> {
             icon: FaIcon(FontAwesomeIcons.boxes),
             label: I18N.of(context).stock,
           ),
+          // TODO - Add in actions when they are written...
+          /*
           BottomNavigationBarItem(
             icon: FaIcon(FontAwesomeIcons.wrench),
             label: I18N.of(context).actions,
           )
+           */
         ]
     );
   }
@@ -225,7 +228,7 @@ class _LocationDisplayState extends RefreshableState<LocationDisplayWidget> {
         return ListView(
           children: stockTiles(),
         );
-      case 1:
+      case 2:
         return ListView(
           children: ListTile.divideTiles(
             context: context,