Observable.h

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/* -*- mode: c++ -*- */

#ifndef _Observable_H_
#define _Observable_H_

#include "libhippo.h"

#ifdef _MSC_VER
#include <msdevstudio/MSconfig.h>
#endif

#include <list>

namespace hippodraw 
{
class Observer;
}

class MDL_HIPPOPLOT_API Observable
{
public:

  typedef std::list < hippodraw::Observer * > ObserverList_t;

private:

  ObserverList_t m_list;

protected:

  Observable();

public:

  virtual ~ Observable ();

  void addObserver ( hippodraw::Observer * );

  const ObserverList_t & getObservers () const;

  void removeObserver ( hippodraw::Observer * );

  virtual void notifyObservers () const;

  typedef void ( hippodraw::Observer::*Action ) ( const Observable * );

protected:

  void notifyObservers ( Action action ) const;

};

#endif // _Observable_H_

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