Return highlighting by focus; move focus to navbar by Down arrow

lib/main.dart

@@ -250,20 +250,27 @@ class _MainScreenState extends State<MainScreen> with SingleTickerProviderStateM
         switch (keyCode) {
           case 127: // Menu on Android TV
           case 327: // EPG on Hisense TV
-            navigatorFocusNode.requestFocus();
-            navigatorFocusNode.focusInDirection(TraversalDirection.down);
+            focusToNavbar(navigatorFocusNode);
             break;
           case 22: // LEFT + RIGHT
           case 21:
             if (_keyPressed == 21 && keyCode == 22 || _keyPressed == 22 && keyCode == 21) {
-              navigatorFocusNode.requestFocus();
-              navigatorFocusNode.focusInDirection(TraversalDirection.down);
+              focusToNavbar(navigatorFocusNode);
             }
             _keyPressed = keyCode;
             Future.delayed(Duration(milliseconds: 100), () =>  {
               _keyPressed = 0
             });
             break;
+          case 20: // DOWN
+            // If it's bottom row, go to navigation bar
+            var row = FocusManager.instance.primaryFocus.parent;
+            var column = row.parent;
+
+            if (column.children.last == row) {
+              focusToNavbar(navigatorFocusNode);
+            }
+            break;
           case 19: // UP
             if (navigatorFocusNode.hasFocus) {
               rootFocusNode.focusInDirection(TraversalDirection.up);
@@ -287,6 +294,11 @@ class _MainScreenState extends State<MainScreen> with SingleTickerProviderStateM
     };
   }
 
+  void focusToNavbar(FocusScopeNode navigatorFocusNode) {
+    navigatorFocusNode.requestFocus();
+    navigatorFocusNode.focusInDirection(TraversalDirection.down); // If player bar is hidden, focus won't be visible, so go down once more
+  }
+
   @override
   Widget build(BuildContext context) {
     FocusScopeNode navigatorFocusNode = FocusScopeNode(); // for bottom navigator

lib/ui/tiles.dart

@@ -135,7 +135,6 @@ class ArtistTile extends StatelessWidget {
     return SizedBox(
       width: 150,
       child: Container(
-        color: Theme.of(context).scaffoldBackgroundColor,
         child: InkWell(
           onTap: onTap,
           onLongPress: onHold,
@@ -246,7 +245,6 @@ class PlaylistCardTile extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return Container(
-      color: Theme.of(context).scaffoldBackgroundColor,
       height: 180.0,
       child: InkWell(
         onTap: onTap,
@@ -293,7 +291,6 @@ class SmartTrackListTile extends StatelessWidget {
   Widget build(BuildContext context) {
     return Container(
       height: 200.0,
-      color: Theme.of(context).scaffoldBackgroundColor,
       child: InkWell(
         onTap: onTap,
         onLongPress: onHold,
@@ -364,7 +361,6 @@ class AlbumCard extends StatelessWidget {
   @override
   Widget build(BuildContext context) {
     return Container(
-      color: Theme.of(context).scaffoldBackgroundColor,
       child: InkWell(
         onTap: onTap,
         onLongPress: onHold,