+ /// do some cleanup
+ /// called when the state is popped from the stack
+ virtual void ExitState(Application &ctrl, SDL_Surface *screen) = 0;
+ /// called when the state becomes the active one
+ virtual void ResumeState(Application &ctrl, SDL_Surface *screen) = 0;
+ /// called when the state becomes inactive
+ virtual void PauseState(Application &ctrl, SDL_Surface *screen) = 0;