onComponentTypeCheck method

@override @mustCallSuper bool onComponentTypeCheck(PositionComponent other)

Defines whether the other component should be able to collide with this component.

If the hitboxParent is not CollisionCallbacks but PositionComponent, there is no CollisionCallbacks.onComponentTypeCheck in that component. As a result, it will always be able to collide with all other types.

Implementation

@override
@mustCallSuper
bool onComponentTypeCheck(PositionComponent other) {
  final otherHitboxParent = (other as ShapeHitbox).hitboxParent;

  final thisCanCollideWithOther = (hitboxParent is! CollisionCallbacks) ||
      (hitboxParent as CollisionCallbacks)
          .onComponentTypeCheck(otherHitboxParent);

  final otherCanCollideWithThis =
      (otherHitboxParent is! CollisionCallbacks) ||
          (otherHitboxParent as CollisionCallbacks)
              .onComponentTypeCheck(hitboxParent);

  return thisCanCollideWithOther && otherCanCollideWithThis;
}