/// Interface for UI <--> game communication.
/// Informs the UI about changes on the state.
abstract class IGameConsumer {
  /// Called when the score changes.
  void updatePoints();

  /// Called when the time changes.
  void updateTime();

  /// Called when there is a change on the board that should be shown to the user.
  void updateStones();

  /// Game stop signal. Called when the timer has run out.
  void gameStopped();
}