refactor: spaceship sandbox refactored to see arrow behaviour

packages/pinball_components/sandbox/lib/stories/spaceship_ramp/spaceship_ramp_game.dart

@@ -2,11 +2,12 @@ import 'dart:async';
 
 import 'package:flame/input.dart';
 import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
 import 'package:pinball_components/pinball_components.dart';
 import 'package:pinball_flame/pinball_flame.dart';
 import 'package:sandbox/stories/ball/basic_ball_game.dart';
 
-class SpaceshipRampGame extends BasicBallGame {
+class SpaceshipRampGame extends BasicBallGame with KeyboardEvents {
   SpaceshipRampGame()
       : super(
           color: Colors.blue,
@@ -19,13 +20,45 @@ class SpaceshipRampGame extends BasicBallGame {
 
     - Activate the "trace" parameter to overlay the body.
     - Tap anywhere on the screen to spawn a ball into the game.
+    - Press space to progress arrow sprites.
 ''';
 
+  late final SpaceshipRamp _spaceshipRamp;
+
   @override
   Future<void> onLoad() async {
     await super.onLoad();
-    await addFromBlueprint(SpaceshipRamp());
+
+    await images.loadAll([
+      Assets.images.spaceship.ramp.railingBackground.keyName,
+      Assets.images.spaceship.ramp.main.keyName,
+      Assets.images.spaceship.ramp.boardOpening.keyName,
+      Assets.images.spaceship.ramp.railingForeground.keyName,
+      Assets.images.spaceship.ramp.arrow.inactive.keyName,
+      Assets.images.spaceship.ramp.arrow.active1.keyName,
+      Assets.images.spaceship.ramp.arrow.active2.keyName,
+      Assets.images.spaceship.ramp.arrow.active3.keyName,
+      Assets.images.spaceship.ramp.arrow.active4.keyName,
+      Assets.images.spaceship.ramp.arrow.active5.keyName,
+    ]);
+
+    _spaceshipRamp = SpaceshipRamp();
+    await addFromBlueprint(_spaceshipRamp);
     camera.followVector2(Vector2(-12, -50));
     await traceAllBodies();
   }
+
+  @override
+  KeyEventResult onKeyEvent(
+    RawKeyEvent event,
+    Set<LogicalKeyboardKey> keysPressed,
+  ) {
+    if (event is RawKeyDownEvent &&
+        event.logicalKey == LogicalKeyboardKey.space) {
+      _spaceshipRamp.progress();
+      return KeyEventResult.handled;
+    }
+
+    return KeyEventResult.ignored;
+  }
 }