/*
  PLACEMENT.hpp  -  Key Abstraction: a way to place and locate a Media Object
 
  Copyright (C)         CinelerraCV
    2007,               Christian Thaeter <ct@pipapo.org>
 
  This program is free software; you can redistribute it and/or
  modify it under the terms of the GNU General Public License as
  published by the Free Software Foundation; either version 2 of the
  License, or (at your option) any later version.
 
  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.
 
  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 
*/


#ifndef MOBJECT_PLACEMENT_H
#define MOBJECT_PLACEMENT_H

#include "common/time.hpp"
#include "common/factory.hpp"
#include "proc/mobject/mobject.hpp"
#include "proc/mobject/session/track.hpp"


namespace mobject
  {


  class Placement;
  class ExplicitPlacement;
  class PlacementFactory;


  class Placement
    {
    protected:
      typedef cinelerra::Time Time;
      typedef session::Track Track;


    public:
      MObject* subject;

      /** 
       * styles of placement.
       */
      enum Style
      {
        FIXED,
        RELATIVE
      };
      
      static PlacementFactory create;
      
      /** resolve the network of placement and
       *  provide the resulting (explicit) placement.
       */
      ExplicitPlacement& resolve () ;
      
    protected:
      Placement ();
      friend class PlacementFactory;
    };
  
  
  typedef shared_ptr<Placement> PPla;
  
  
  
  
  /** 
   * Factory specialized for creating Media Asset objects.
   */ 
  class PlacementFactory : public cinelerra::Factory<Placement>
    {
    public:
      typedef shared_ptr<Placement> PType;
      typedef cinelerra::Time Time;
      
      PType operator() (Placement::Style, Time, PMO subject);

    };



} // namespace mobject
#endif