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GameStateManager.h

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#ifndef __GameStateManager_H__
#define __GameStateManager_H__

// Includes
#include "Singleton.h"
#include "Array.h"
#include "HashTable.h"
#include "HashTableKey_StringId.h"

// Forward declares
class GameState;
class GameStateDefinition;

// GameStateManager
class GameStateManager:public Singleton<GameStateManager>
   {
   public:
      GameStateManager();
      virtual ~GameStateManager();
      
      void Update(float deltaTime);

      void SetState(StringId state);
      StringId GetState();

      typedef GameState* (*CreateFunction)();
      void RegisterGameState(StringId id, CreateFunction createFunction);
      
      void ExitCurrentState();

      void SwitchState(StringId state, float transitionOutTime = 0, float transitionInTime = 0);

      bool IsTransitioning();
      bool IsTransitioningOut();
      bool IsTransitioningIn();
      float GetTransitionValue();

      void ExitApplication();
      bool IsExitFlagSet();

   private:
      friend class GameState;
      GameState* CreateGameState(StringId id);

   private:
      bool exitRequested_;
      bool exitFlag_;

      StringId state_;
      GameState* stateInstance_;
      StringId stateToSwitchTo_;
      
      bool transitioningOut_;
      bool transitioningIn_;
      float transitionInTime_;
      float transitionInTimeElapsed_;
      float transitionOutTime_;
      float transitionOutTimeElapsed_;
      float newTransitionInTime_;

      HashTable<HashTableKey_StringId,CreateFunction> gameStates_;
   };

#define siGameStateManager GameStateManager::GetInstance()

#endif /* __GameStateManager_H__ */

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