refactor: implemented ContactCallbacks2

lib/game/components/alien_zone.dart

@@ -1,5 +1,6 @@
 // ignore_for_file: avoid_renaming_method_parameters
 
+import 'package:flame/collisions.dart';
 import 'package:flame/components.dart';
 import 'package:flame_forge2d/flame_forge2d.dart';
 import 'package:flutter/material.dart';
@@ -22,8 +23,6 @@ class AlienZone extends Component with HasGameRef<PinballGame> {
   Future<void> onLoad() async {
     await super.onLoad();
 
-    gameRef.addContactCallback(_ControlledAlienBumperBallContactCallback());
-
     final lowerBumper = ControlledAlienBumper.a()
       ..initialPosition = Vector2(-32.52, -9.34);
     final upperBumper = ControlledAlienBumper.b()
@@ -41,7 +40,7 @@ class AlienZone extends Component with HasGameRef<PinballGame> {
 /// {@endtemplate}
 @visibleForTesting
 class ControlledAlienBumper extends AlienBumper
-    with Controls<_AlienBumperController>, ScorePoints {
+    with Controls<_AlienBumperController>, ScorePoints, ContactCallbacks2 {
   /// {@macro controlled_alien_bumper}
   ControlledAlienBumper.a() : super.a() {
     controller = _AlienBumperController(this);
@@ -55,6 +54,12 @@ class ControlledAlienBumper extends AlienBumper
   @override
   // TODO(ruimiguel): change points when get final points map.
   int get points => 20;
+
+  @override
+  void beginContact(Object other, Contact contact) {
+    super.beginContact(other, contact);
+    if (other is Ball) controller.hit();
+  }
 }
 
 /// {@template alien_bumper_controller}
@@ -80,16 +85,3 @@ class _AlienBumperController extends ComponentController<AlienBumper>
     isActivated = !isActivated;
   }
 }
-
-/// Listens when a [Ball] bounces bounces against a [AlienBumper].
-class _ControlledAlienBumperBallContactCallback
-    extends ContactCallback<Controls<_AlienBumperController>, Ball> {
-  @override
-  void begin(
-    Controls<_AlienBumperController> controlledAlienBumper,
-    Ball _,
-    Contact __,
-  ) {
-    controlledAlienBumper.controller.hit();
-  }
-}

lib/game/components/controlled_ball.dart

@@ -1,5 +1,5 @@
 import 'package:flame/components.dart';
-import 'package:flame_forge2d/forge2d_game.dart';
+import 'package:flame_forge2d/flame_forge2d.dart';
 import 'package:flutter/material.dart';
 import 'package:pinball/game/game.dart';
 import 'package:pinball_components/pinball_components.dart';
@@ -9,7 +9,8 @@ import 'package:pinball_theme/pinball_theme.dart';
 /// {@template controlled_ball}
 /// A [Ball] with a [BallController] attached.
 /// {@endtemplate}
-class ControlledBall extends Ball with Controls<BallController> {
+class ControlledBall extends Ball<PinballGame>
+    with Controls<BallController>, ContactCallbacks2 {
   /// A [Ball] that launches from the [Plunger].
   ///
   /// When a launched [Ball] is lost, it will decrease the [GameState.balls]
@@ -39,6 +40,14 @@ class ControlledBall extends Ball with Controls<BallController> {
     controller = DebugBallController(this);
     priority = Ball.boardPriority;
   }
+
+  @override
+  void beginContact(Object other, Contact contact) {
+    if (other is ScorePoints) {
+      gameRef.read<GameBloc>().add(Scored(points: other.points));
+      gameRef.audio.score();
+    }
+  }
 }
 
 /// {@template ball_controller}
@@ -51,11 +60,8 @@ class BallController extends ComponentController<Ball>
 
   /// Removes the [Ball] from a [PinballGame].
   ///
-  /// Triggered by [BottomWallBallContactCallback] when the [Ball] falls into
+  /// Triggered when the [Ball] falls into a [BottomWall].
-  /// a [BottomWall].
+  void lost() => component.shouldRemove = true;
-  void lost() {
-    component.shouldRemove = true;
-  }
 
   /// Stops the [Ball] inside of the [SparkyComputer] while the turbo charge
   /// sequence runs, then boosts the ball out of the computer.

lib/game/components/controlled_sparky_computer.dart

@@ -18,11 +18,11 @@ class ControlledSparkyComputer extends SparkyComputer
   }
 
   @override
-  void build(Forge2DGame _) {
+  void build(_) {
-    addContactCallback(SparkyTurboChargeSensorBallContactCallback());
     final sparkyTurboChargeSensor = SparkyTurboChargeSensor()
       ..initialPosition = Vector2(-13, -49.8);
     add(sparkyTurboChargeSensor);
+
     super.build(_);
   }
 }
@@ -40,11 +40,12 @@ class SparkyComputerController
 }
 
 /// {@template sparky_turbo_charge_sensor}
-/// Small sensor body used to detect when a ball has entered the
+/// Small sensor body used to detect when a ball has enters the
-/// [SparkyComputer] with the [SparkyTurboChargeSensorBallContactCallback].
+/// [SparkyComputer].
 /// {@endtemplate}
 @visibleForTesting
-class SparkyTurboChargeSensor extends BodyComponent with InitialPosition {
+class SparkyTurboChargeSensor extends BodyComponent
+    with InitialPosition, ContactCallbacks2 {
   /// {@macro sparky_turbo_charge_sensor}
   SparkyTurboChargeSensor() {
     renderBody = false;
@@ -53,32 +54,18 @@ class SparkyTurboChargeSensor extends BodyComponent with InitialPosition {
   @override
   Body createBody() {
     final shape = CircleShape()..radius = 0.1;
-
     final fixtureDef = FixtureDef(shape)..isSensor = true;
-
     final bodyDef = BodyDef()
       ..position = initialPosition
       ..userData = this;
 
     return world.createBody(bodyDef)..createFixture(fixtureDef);
   }
-}
-
-/// {@template sparky_turbo_charge_sensor_ball_contact_callback}
-/// Turbo charges the [Ball] on contact with [SparkyTurboChargeSensor].
-/// {@endtemplate}
-@visibleForTesting
-class SparkyTurboChargeSensorBallContactCallback
-    extends ContactCallback<SparkyTurboChargeSensor, ControlledBall> {
-  /// {@macro sparky_turbo_charge_sensor_ball_contact_callback}
-  SparkyTurboChargeSensorBallContactCallback();
 
   @override
-  void begin(
+  void beginContact(Object other, Contact contact) {
-    SparkyTurboChargeSensor sparkyTurboChargeSensor,
+    super.beginContact(other, contact);
-    ControlledBall ball,
+
-    _,
+    if (other is ControlledBall) other.controller.turboCharge();
-  ) {
-    ball.controller.turboCharge();
   }
 }

lib/game/components/flutter_forest.dart

@@ -23,8 +23,6 @@ class FlutterForest extends Component
   @override
   Future<void> onLoad() async {
     await super.onLoad();
-    gameRef.addContactCallback(_DashNestBumperBallContactCallback());
-
     final signPost = FlutterSignPost()..initialPosition = Vector2(8.35, -58.3);
 
     final bigNest = _BigDashNestBumper()
@@ -81,27 +79,40 @@ class _FlutterForestController extends ComponentController<FlutterForest>
 
 // TODO(alestiago): Revisit ScorePoints logic once the FlameForge2D
 // ContactCallback process is enhanced.
-class _BigDashNestBumper extends BigDashNestBumper with ScorePoints {
+class _BigDashNestBumper extends BigDashNestBumper
+    with ScorePoints, ContactCallbacks2 {
   @override
   int get points => 20;
+
+  @override
+  void beginContact(Object other, Contact contact) {
+    super.beginContact(other, contact);
+    if (other is! Ball) return;
+
+    final parent = this.parent;
+    if (parent is FlutterForest) {
+      parent.controller.activateBumper(this);
+    }
+  }
 }
 
-class _SmallDashNestBumper extends SmallDashNestBumper with ScorePoints {
+class _SmallDashNestBumper extends SmallDashNestBumper
+    with ScorePoints, ContactCallbacks2 {
   _SmallDashNestBumper.a() : super.a();
 
   _SmallDashNestBumper.b() : super.b();
 
   @override
   int get points => 20;
-}
 
-class _DashNestBumperBallContactCallback
-    extends ContactCallback<DashNestBumper, Ball> {
   @override
-  void begin(DashNestBumper dashNestBumper, _, __) {
+  void beginContact(Object other, Contact contact) {
-    final parent = dashNestBumper.parent;
+    super.beginContact(other, contact);
+    if (other is! Ball) return;
+
+    final parent = this.parent;
     if (parent is FlutterForest) {
-      parent.controller.activateBumper(dashNestBumper);
+      parent.controller.activateBumper(this);
     }
   }
 }

lib/game/components/google_word.dart

@@ -16,34 +16,33 @@ class GoogleWord extends Component
   /// {@macro google_word}
   GoogleWord({
     required Vector2 position,
-  }) : _position = position {
+  }) : super(
+          children: [
+            _GoogleLetter(0)
+              ..initialPosition = position + Vector2(-12.92, 1.82),
+            _GoogleLetter(1)
+              ..initialPosition = position + Vector2(-8.33, -0.65),
+            _GoogleLetter(2)
+              ..initialPosition = position + Vector2(-2.88, -1.75),
+            _GoogleLetter(3)..initialPosition = position + Vector2(2.88, -1.75),
+            _GoogleLetter(4)..initialPosition = position + Vector2(8.33, -0.65),
+            _GoogleLetter(5)..initialPosition = position + Vector2(12.92, 1.82),
+          ],
+        ) {
     controller = _GoogleWordController(this);
   }
+}
 
-  final Vector2 _position;
+/// Activates a [GoogleLetter] when it contacts with a [Ball].
+class _GoogleLetter extends GoogleLetter with ContactCallbacks2 {
+  _GoogleLetter(int index) : super(index);
 
   @override
-  Future<void> onLoad() async {
+  void beginContact(Object other, Contact contact) {
-    await super.onLoad();
+    super.beginContact(other, contact);
-    gameRef.addContactCallback(_GoogleLetterBallContactCallback());
-
-    final offsets = [
-      Vector2(-12.92, 1.82),
-      Vector2(-8.33, -0.65),
-      Vector2(-2.88, -1.75),
-      Vector2(2.88, -1.75),
-      Vector2(8.33, -0.65),
-      Vector2(12.92, 1.82),
-    ];
 
-    final letters = <GoogleLetter>[];
+    final parent = this.parent;
-    for (var index = 0; index < offsets.length; index++) {
+    if (parent is GoogleWord) parent.controller.activate(this);
-      letters.add(
-        GoogleLetter(index)..initialPosition = _position + offsets[index],
-      );
-    }
-
-    await addAll(letters);
   }
 }
 
@@ -69,15 +68,3 @@ class _GoogleWordController extends ComponentController<GoogleWord>
     }
   }
 }
-
-/// Activates a [GoogleLetter] when it contacts with a [Ball].
-class _GoogleLetterBallContactCallback
-    extends ContactCallback<GoogleLetter, Ball> {
-  @override
-  void begin(GoogleLetter googleLetter, _, __) {
-    final parent = googleLetter.parent;
-    if (parent is GoogleWord) {
-      parent.controller.activate(googleLetter);
-    }
-  }
-}

lib/game/components/launcher.dart

@@ -7,7 +7,7 @@ import 'package:pinball_flame/pinball_flame.dart';
 /// A [Blueprint] which creates the [Plunger], [RocketSpriteComponent] and
 /// [LaunchRamp].
 /// {@endtemplate}
-class Launcher extends Forge2DBlueprint {
+class Launcher extends Blueprint {
   /// {@macro launcher}
   Launcher();
 
@@ -15,7 +15,8 @@ class Launcher extends Forge2DBlueprint {
   late final Plunger plunger;
 
   @override
-  void build(Forge2DGame gameRef) {
+  // ignore: avoid_renaming_method_parameters
+  void build(_) {
     plunger = ControlledPlunger(compressionDistance: 12.3)
       ..initialPosition = Vector2(40.1, 38);
 

lib/game/components/score_points.dart

@@ -1,7 +1,4 @@
-// ignore_for_file: avoid_renaming_method_parameters
-
 import 'package:flame_forge2d/flame_forge2d.dart';
-import 'package:pinball/game/game.dart';
 import 'package:pinball_components/pinball_components.dart';
 
 /// {@template score_points}
@@ -17,24 +14,3 @@ mixin ScorePoints<T extends Forge2DGame> on BodyComponent<T> {
     body.userData = this;
   }
 }
-
-/// {@template ball_score_points_callbacks}
-/// Adds points to the score when a [Ball] collides with a [BodyComponent] that
-/// implements [ScorePoints].
-/// {@endtemplate}
-class BallScorePointsCallback extends ContactCallback<Ball, ScorePoints> {
-  /// {@macro ball_score_points_callbacks}
-  BallScorePointsCallback(PinballGame game) : _gameRef = game;
-
-  final PinballGame _gameRef;
-
-  @override
-  void begin(
-    Ball _,
-    ScorePoints scorePoints,
-    Contact __,
-  ) {
-    _gameRef.read<GameBloc>().add(Scored(points: scorePoints.points));
-    _gameRef.audio.score();
-  }
-}

lib/game/components/sparky_fire_zone.dart

@@ -22,8 +22,6 @@ class SparkyFireZone extends Component with HasGameRef<PinballGame> {
   Future<void> onLoad() async {
     await super.onLoad();
 
-    gameRef.addContactCallback(_ControlledSparkyBumperBallContactCallback());
-
     final lowerLeftBumper = ControlledSparkyBumper.a()
       ..initialPosition = Vector2(-23.15, -41.65);
     final upperLeftBumper = ControlledSparkyBumper.b()
@@ -44,7 +42,7 @@ class SparkyFireZone extends Component with HasGameRef<PinballGame> {
 /// {@endtemplate}
 @visibleForTesting
 class ControlledSparkyBumper extends SparkyBumper
-    with Controls<_SparkyBumperController>, ScorePoints {
+    with Controls<_SparkyBumperController>, ScorePoints, ContactCallbacks2 {
   ///{@macro controlled_sparky_bumper}
   ControlledSparkyBumper.a() : super.a() {
     controller = _SparkyBumperController(this);
@@ -62,6 +60,12 @@ class ControlledSparkyBumper extends SparkyBumper
 
   @override
   int get points => 20;
+
+  @override
+  void beginContact(Object other, Contact contact) {
+    super.beginContact(other, contact);
+    if (other is Ball) controller.hit();
+  }
 }
 
 /// {@template sparky_bumper_controller}
@@ -88,16 +92,3 @@ class _SparkyBumperController extends ComponentController<SparkyBumper>
     isActivated = !isActivated;
   }
 }
-
-/// Listens when a [Ball] bounces bounces against a [SparkyBumper].
-class _ControlledSparkyBumperBallContactCallback
-    extends ContactCallback<Controls<_SparkyBumperController>, Ball> {
-  @override
-  void begin(
-    Controls<_SparkyBumperController> controlledSparkyBumper,
-    Ball _,
-    Contact __,
-  ) {
-    controlledSparkyBumper.controller.hit();
-  }
-}

lib/game/components/wall.dart

@@ -4,6 +4,7 @@ import 'package:flame/extensions.dart';
 import 'package:flame_forge2d/flame_forge2d.dart';
 import 'package:pinball/game/game.dart';
 import 'package:pinball_components/pinball_components.dart' hide Assets;
+import 'package:pinball_flame/pinball_flame.dart';
 
 /// {@template wall}
 /// A continuous generic and [BodyType.static] barrier that divides a game area.
@@ -57,26 +58,18 @@ List<Wall> createBoundaries(Forge2DGame game) {
 
 /// {@template bottom_wall}
 /// [Wall] located at the bottom of the board.
-///
-/// Collisions with [BottomWall] are listened by
-/// [BottomWallBallContactCallback].
 /// {@endtemplate}
-class BottomWall extends Wall {
+class BottomWall extends Wall with ContactCallbacks2 {
   /// {@macro bottom_wall}
   BottomWall()
       : super(
           start: BoardDimensions.bounds.bottomLeft.toVector2(),
           end: BoardDimensions.bounds.bottomRight.toVector2(),
         );
-}
 
-/// {@template bottom_wall_ball_contact_callback}
-/// Listens when a [ControlledBall] falls into a [BottomWall].
-/// {@endtemplate}
-class BottomWallBallContactCallback
-    extends ContactCallback<ControlledBall, BottomWall> {
   @override
-  void begin(ControlledBall ball, BottomWall wall, Contact contact) {
+  void beginContact(Object other, Contact contact) {
-    ball.controller.lost();
+    super.beginContact(other, contact);
+    if (other is ControlledBall) other.controller.lost();
   }
 }

lib/game/pinball_game.dart

@@ -36,8 +36,6 @@ class PinballGame extends Forge2DGame
 
   @override
   Future<void> onLoad() async {
-    _addContactCallbacks();
-
     unawaited(add(ScoreEffectController(this)));
     unawaited(add(gameFlowController = GameFlowController(this)));
     unawaited(add(CameraController(this)));
@@ -69,11 +67,6 @@ class PinballGame extends Forge2DGame
     await super.onLoad();
   }
 
-  void _addContactCallbacks() {
-    addContactCallback(BallScorePointsCallback(this));
-    addContactCallback(BottomWallBallContactCallback());
-  }
-
   Future<void> _addGameBoundaries() async {
     await add(BottomWall());
     createBoundaries(this).forEach(add);

packages/pinball_components/lib/src/components/boundaries.dart

@@ -8,7 +8,7 @@ import 'package:pinball_flame/pinball_flame.dart';
 /// {@template boundaries}
 /// A [Blueprint] which creates the [_BottomBoundary] and [_OuterBoundary].
 ///{@endtemplate boundaries}
-class Boundaries extends Forge2DBlueprint {
+class Boundaries extends Blueprint {
   @override
   void build(_) {
     final bottomBoundary = _BottomBoundary();

packages/pinball_components/lib/src/components/dino_walls.dart

@@ -11,7 +11,7 @@ import 'package:pinball_flame/pinball_flame.dart';
 /// {@template dinowalls}
 /// A [Blueprint] which creates walls for the [ChromeDino].
 /// {@endtemplate}
-class DinoWalls extends Forge2DBlueprint {
+class DinoWalls extends Blueprint {
   /// {@macro dinowalls}
   DinoWalls();
 

packages/pinball_components/lib/src/components/launch_ramp.dart

@@ -11,13 +11,9 @@ import 'package:pinball_flame/pinball_flame.dart';
 /// A [Blueprint] which creates the [_LaunchRampBase] and
 /// [_LaunchRampForegroundRailing].
 /// {@endtemplate}
-class LaunchRamp extends Forge2DBlueprint {
+class LaunchRamp extends Blueprint {
   @override
   void build(_) {
-    addAllContactCallback([
-      LayerSensorBallContactCallback<_LaunchRampExit>(),
-    ]);
-
     final launchRampBase = _LaunchRampBase();
 
     final launchRampForegroundRailing = _LaunchRampForegroundRailing();

packages/pinball_components/lib/src/components/layer_sensor.dart

@@ -2,6 +2,7 @@
 
 import 'package:flame_forge2d/flame_forge2d.dart';
 import 'package:pinball_components/pinball_components.dart';
+import 'package:pinball_flame/pinball_flame.dart';
 
 /// {@template layer_entrance_orientation}
 /// Determines if a layer entrance is oriented [up] or [down] on the board.
@@ -23,7 +24,8 @@ enum LayerEntranceOrientation {
 /// By default the base [layer] is set to [Layer.board] and the
 /// [outsidePriority] is set to the lowest possible [Layer].
 /// {@endtemplate}
-abstract class LayerSensor extends BodyComponent with InitialPosition, Layered {
+abstract class LayerSensor extends BodyComponent
+    with InitialPosition, Layered, ContactCallbacks2 {
   /// {@macro layer_sensor}
   LayerSensor({
     required Layer insideLayer,
@@ -75,35 +77,30 @@ abstract class LayerSensor extends BodyComponent with InitialPosition, Layered {
 
     return world.createBody(bodyDef)..createFixture(fixtureDef);
   }
-}
 
-/// {@template layer_sensor_ball_contact_callback}
-/// Detects when a [Ball] enters or exits a [Layer] through a [LayerSensor].
-///
-/// Modifies [Ball]'s [Layer] and render priority depending on whether the
-/// [Ball] is on or outside of a [Layer].
-/// {@endtemplate}
-class LayerSensorBallContactCallback<LayerEntrance extends LayerSensor>
-    extends ContactCallback<Ball, LayerEntrance> {
   @override
-  void begin(Ball ball, LayerEntrance layerEntrance, Contact _) {
+  void beginContact(Object other, Contact contact) {
-    if (ball.layer != layerEntrance.insideLayer) {
+    super.beginContact(other, contact);
+    if (other is! Ball) return;
+    final ball = other;
+
+    if (ball.layer != insideLayer) {
       final isBallEnteringOpening =
-          (layerEntrance.orientation == LayerEntranceOrientation.down &&
+          (orientation == LayerEntranceOrientation.down &&
                   ball.body.linearVelocity.y < 0) ||
-              (layerEntrance.orientation == LayerEntranceOrientation.up &&
+              (orientation == LayerEntranceOrientation.up &&
                   ball.body.linearVelocity.y > 0);
 
       if (isBallEnteringOpening) {
         ball
-          ..layer = layerEntrance.insideLayer
+          ..layer = insideLayer
-          ..priority = layerEntrance.insidePriority
+          ..priority = insidePriority
           ..reorderChildren();
       }
     } else {
       ball
-        ..layer = layerEntrance.outsideLayer
+        ..layer = outsideLayer
-        ..priority = layerEntrance.outsidePriority
+        ..priority = outsidePriority
         ..reorderChildren();
     }
   }

packages/pinball_components/lib/src/components/slingshot.dart

@@ -9,7 +9,7 @@ import 'package:pinball_flame/pinball_flame.dart';
 /// A [Blueprint] which creates the pair of [Slingshot]s on the right side of
 /// the board.
 /// {@endtemplate}
-class Slingshots extends Forge2DBlueprint {
+class Slingshots extends Blueprint {
   @override
   void build(_) {
     final upperSlingshot = Slingshot(

packages/pinball_components/lib/src/components/spaceship.dart

@@ -12,7 +12,7 @@ import 'package:pinball_flame/pinball_flame.dart';
 /// {@template spaceship}
 /// A [Blueprint] which creates the spaceship feature.
 /// {@endtemplate}
-class Spaceship extends Forge2DBlueprint {
+class Spaceship extends Blueprint {
   /// {@macro spaceship}
   Spaceship({required this.position});
 
@@ -24,11 +24,6 @@ class Spaceship extends Forge2DBlueprint {
 
   @override
   void build(_) {
-    addAllContactCallback([
-      LayerSensorBallContactCallback<_SpaceshipEntrance>(),
-      LayerSensorBallContactCallback<_SpaceshipHole>(),
-    ]);
-
     addAll([
       SpaceshipSaucer()..initialPosition = position,
       _SpaceshipEntrance()..initialPosition = position,

packages/pinball_components/lib/src/components/spaceship_rail.dart

@@ -11,16 +11,12 @@ import 'package:pinball_flame/pinball_flame.dart';
 /// {@template spaceship_rail}
 /// A [Blueprint] for the spaceship drop tube.
 /// {@endtemplate}
-class SpaceshipRail extends Forge2DBlueprint {
+class SpaceshipRail extends Blueprint {
   /// {@macro spaceship_rail}
   SpaceshipRail();
 
   @override
   void build(_) {
-    addAllContactCallback([
-      LayerSensorBallContactCallback<_SpaceshipRailExit>(),
-    ]);
-
     final railRamp = _SpaceshipRailRamp();
     final railEnd = _SpaceshipRailExit();
     final topBase = _SpaceshipRailBase(radius: 0.55)

packages/pinball_components/lib/src/components/spaceship_ramp.dart

@@ -11,16 +11,12 @@ import 'package:pinball_flame/pinball_flame.dart';
 /// {@template spaceship_ramp}
 /// A [Blueprint] which creates the ramp leading into the [Spaceship].
 /// {@endtemplate}
-class SpaceshipRamp extends Forge2DBlueprint {
+class SpaceshipRamp extends Blueprint {
   /// {@macro spaceship_ramp}
   SpaceshipRamp();
 
   @override
   void build(_) {
-    addAllContactCallback([
-      LayerSensorBallContactCallback<_SpaceshipRampOpening>(),
-    ]);
-
     final rightOpening = _SpaceshipRampOpening(
       // TODO(ruimiguel): set Board priority when defined.
       outsidePriority: 1,

packages/pinball_components/lib/src/components/sparky_computer.dart

@@ -9,7 +9,7 @@ import 'package:pinball_flame/pinball_flame.dart';
 /// A [Blueprint] which creates the [_ComputerBase] and
 /// [_ComputerTopSpriteComponent].
 /// {@endtemplate}
-class SparkyComputer extends Forge2DBlueprint {
+class SparkyComputer extends Blueprint {
   @override
   void build(_) {
     final computerBase = _ComputerBase();

packages/pinball_components/sandbox/lib/stories/google_word/google_letter_game.dart

@@ -17,7 +17,7 @@ class GoogleLetterGame extends BasicBallGame {
   @override
   Future<void> onLoad() async {
     await super.onLoad();
-    addContactCallback(_BallGoogleLetterContactCallback());
+    world.setContactListener(_WorldContactListener());
 
     camera.followVector2(Vector2.zero());
     await add(GoogleLetter(0));
@@ -26,11 +26,21 @@ class GoogleLetterGame extends BasicBallGame {
   }
 }
 
-class _BallGoogleLetterContactCallback
+class _WorldContactListener extends ContactListener {
-    extends ContactCallback<Ball, GoogleLetter> {
   @override
-  void begin(Ball<Forge2DGame> a, GoogleLetter b, Contact contact) {
+  void beginContact(Contact contact) {
-    super.begin(a, b, contact);
+    [
-    b.activate();
+      contact.bodyA.userData,
+      contact.bodyB.userData,
+    ].whereType<GoogleLetter>().first.activate();
   }
+
+  @override
+  void endContact(Contact contact) {}
+
+  @override
+  void postSolve(Contact contact, ContactImpulse impulse) {}
+
+  @override
+  void preSolve(Contact contact, Manifold oldManifold) {}
 }

packages/pinball_flame/lib/src/blueprint.dart

@@ -61,36 +61,6 @@ abstract class Blueprint<T extends FlameGame> extends Component {
   List<Blueprint> get blueprints => List.unmodifiable(_blueprints);
 }
 
-/// A [Blueprint] that provides additional
-/// structures specific to flame_forge2d
-abstract class Forge2DBlueprint extends Blueprint<Forge2DGame> {
-  final List<ContactCallback> _callbacks = [];
-
-  /// Adds a single [ContactCallback] to this blueprint
-  void addContactCallback(ContactCallback callback) {
-    assert(!_isAttached, _attachedErrorMessage);
-    _callbacks.add(callback);
-  }
-
-  /// Adds a collection of [ContactCallback]s to this blueprint
-  void addAllContactCallback(List<ContactCallback> callbacks) {
-    assert(!_isAttached, _attachedErrorMessage);
-    _callbacks.addAll(callbacks);
-  }
-
-  @override
-  Future<void> attach(Forge2DGame game) async {
-    await super.attach(game);
-
-    for (final callback in _callbacks) {
-      game.addContactCallback(callback);
-    }
-  }
-
-  /// Returns a copy of the callbacks built by this blueprint
-  List<ContactCallback> get callbacks => List.unmodifiable(_callbacks);
-}
-
 /// Adds helper methods regardin [Blueprint]s to [FlameGame]
 extension FlameGameBlueprint on FlameGame {
   /// Shortcut to attach a [Blueprint] instance to this game