public TetrisGameViewModel(Grid gameRenderSurface, Grid nextShapeRenderSurface)
{
var playfield = new GameField();
var renderer = new GameRenderer(gameRenderSurface, nextShapeRenderSurface, playfield);
this.gameEngine = new GameEngine(playfield, renderer);
this.gameEngine.GamePropertyChanged += GameEngine_PropertyChanged;
this.gameEngine.GameEnded += GameEngine_GameEnded;
this.gameEngine.EndGameAnimationCompleted += GameEngine_EndGameAnimationCompleted;
this.StartGameCommand = new RelayCommand(OnStartGame, OnCanStartGame);
this.EndGameCommand = new RelayCommand(OnEndGame, OnCanEndGame);
this.PauseGameCommand = new RelayCommand(OnPause, OnCanPauseGame);
this.ResumeGameCommand = new RelayCommand(OnResume, OnCanResumeGame);
this.MoveCommand = new RelayCommand(OnMove);
this.RotateCommand = new RelayCommand(OnRotate);
this.HideEndGameInfoCommand = new RelayCommand(OnHideEndGameInfo);
this.Highscore = ScoringSystem.GetHighscore();
}