StateMachine.hpp

/******************************************************************************
 
  nomlib - C++11 cross-platform game engine
 
Copyright (c) 2013, 2014 Jeffrey Carpenter <i8degrees@gmail.com>
All rights reserved.
 
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modification, are permitted provided that the following conditions are met:
 
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******************************************************************************/
#ifndef NOMLIB_SYSTEM_STATE_MACHINE_HPP
#define NOMLIB_SYSTEM_STATE_MACHINE_HPP
 
#include <memory>
#include <vector>
#include <queue>
 
#include "nomlib/config.hpp"
 
namespace nom {
 
// Forward declarations
struct Event;
class IState;
class RenderWindow;
 
namespace priv {

struct DeferredState
{
  bool deferred;
  std::unique_ptr<IState> state;
  void* data;
};
 
} // namespace priv

class StateMachine
{
  public:
    StateMachine();

    ~StateMachine();
 
    // virtual void set_state ( uint32 id, void_ptr data = nullptr );

    uint32 count() const;

    uint32 current_state_id( void ) const;

    uint32 next_state_id( void ) const;

    void set_state( std::unique_ptr<IState> state, void_ptr data );

    void pop_state( void_ptr data );

    void on_event(const Event& ev);

    void update( float delta );

    void draw( RenderWindow& );
 
  private:
    void set_deferred_state( std::unique_ptr<IState> state, void_ptr data );

    priv::DeferredState next_state_;

    std::vector<std::unique_ptr<IState>> states_;
};
 
} // namespace nom
 
#endif // include guard defined