fix: keep focus on game

lib/game/pinball_game.dart

@@ -23,7 +23,8 @@ class PinballGame extends Forge2DGame
   PinballGame({
     required this.characterTheme,
     required this.audio,
-  }) : super(gravity: Vector2(0, 30)) {
+  })  : focusNode = FocusNode(),
+        super(gravity: Vector2(0, 30)) {
     images.prefix = '';
     controller = _GameBallsController(this);
   }
@@ -38,6 +39,8 @@ class PinballGame extends Forge2DGame
 
   final PinballAudio audio;
 
+  final FocusNode focusNode;
+
   late final GameFlowController gameFlowController;
 
   @override

lib/game/view/pinball_game_page.dart

@@ -120,9 +120,16 @@ class PinballGameLoadedView extends StatelessWidget {
     return Stack(
       children: [
         Positioned.fill(
+          child: MouseRegion(
+            onHover: (_) {
+              if (!game.focusNode.hasFocus) {
+                game.focusNode.requestFocus();
+              }
+            },
             child: GameWidget<PinballGame>(
               game: game,
               initialActiveOverlays: const [PinballGame.playButtonOverlay],
+              focusNode: game.focusNode,
               overlayBuilderMap: {
                 PinballGame.playButtonOverlay: (context, game) {
                   return Positioned(
@@ -135,6 +142,7 @@ class PinballGameLoadedView extends StatelessWidget {
               },
             ),
           ),
+        ),
         // TODO(arturplaczek): add Visibility to GameHud based on StartGameBloc
         // status
         Positioned(

test/game/view/pinball_game_page_test.dart

@@ -1,5 +1,7 @@
 // ignore_for_file: prefer_const_constructors
 
+import 'dart:ui';
+
 import 'package:bloc_test/bloc_test.dart';
 import 'package:flame/game.dart';
 import 'package:flutter/material.dart';
@@ -237,5 +239,26 @@ void main() {
         findsOneWidget,
       );
     });
+
+    testWidgets('keep focus on game when mouse hovers over it', (tester) async {
+      await tester.pumpApp(
+        PinballGameView(game: game),
+        gameBloc: gameBloc,
+        startGameBloc: startGameBloc,
+      );
+
+      game.focusNode.unfocus();
+      await tester.pump();
+
+      expect(game.focusNode.hasFocus, isFalse);
+
+      final gesture = await tester.createGesture(kind: PointerDeviceKind.mouse);
+      await gesture.addPointer(location: Offset.zero);
+      addTearDown(gesture.removePointer);
+      await gesture.moveTo((game.size / 2).toOffset());
+      await tester.pump();
+
+      expect(game.focusNode.hasFocus, isTrue);
+    });
   });
 }