Fix noisy OS sounds on key presses

Signed-off-by: Hans Kokx <hans.d.kokx@gmail.com>

lib/main.dart

@@ -90,12 +90,15 @@ class _PlayerState extends State<Player> {
 
   @override
   Widget build(BuildContext context) {
-    return KeyboardListener(
+    return Focus(
       focusNode: _focusNode,
-      onKeyEvent: (value) {
+      onKeyEvent: (FocusNode node, value) {
-        if (value is! KeyDownEvent && value is! KeyRepeatEvent) return;
+        if (value is! KeyDownEvent && value is! KeyRepeatEvent) {
+          return KeyEventResult.ignored;
+        }
 
         final LogicalKeyboardKey key = value.logicalKey;
+        bool handled = false;
 
         if (key == LogicalKeyboardKey.keyA) {
           // Move left
@@ -103,6 +106,7 @@ class _PlayerState extends State<Player> {
           if (playerAngle < 0) {
             playerAngle += 2 * math.pi;
           }
+          handled = true;
         } else if (key == LogicalKeyboardKey.keyD) {
           // Move right
           playerAngle += 0.1;
@@ -110,15 +114,23 @@ class _PlayerState extends State<Player> {
           if (playerAngle > 2 * math.pi) {
             playerAngle -= 2 * math.pi;
           }
+          handled = true;
         } else if (key == LogicalKeyboardKey.keyW) {
           // Move forward
           playerPosition += playerDelta;
+          handled = true;
         } else if (key == LogicalKeyboardKey.keyS) {
           // Move backwwards
           playerPosition -= playerDelta;
+          handled = true;
         }
 
-        setState(() {});
+        if (handled) {
+          setState(() {});
+          return KeyEventResult.handled;
+        }
+
+        return KeyEventResult.ignored;
       },
       child: CustomPaint(
         painter: PlayerPainter(