public GameState Push(GameState gameState)
{
if (gameState == null)
{
throw new ArgumentNullException("gameState");
}
if (ActiveGameState != null)
{
ActiveGameState.Pause();
}
GameStates.Add(gameState);
ActiveGameState = gameState;
gameState.Start();
return(gameState);
}
public void Switch(GameState gameState)
{
if (gameState == null)
{
throw new ArgumentNullException("gameState");
}
if (ActiveGameState != null)
{
ActiveGameState.Pause();
}
if (!GameStates.Remove(gameState))
{
throw new ArgumentException(gameState + " is not on the stack");
}
GameStates.Add(gameState);
gameState.Resume();
ActiveGameState = gameState;
}