/*
  timeline-entity.hpp  -  Declaration of the timeline entity class

  Copyright (C)         Lumiera.org
    2010,               Stefan Kangas <skangas@skangas.se>

  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.

* *****************************************************/

/** @file timeline-entity.hpp
 ** Declares the Timeline Entity class.
 */

#ifndef TIMELINE_ENTITY_HPP
#define TIMELINE_ENTITY_HPP

#include "gui/gtk-base.hpp"
#include "lib/time/timevalue.hpp"

#include <string>
#include <tr1/memory>
#include <cairomm/cairomm.h>


namespace gui {
namespace widgets {
namespace timeline {
  
  using lib::time::Time;
  using std::tr1::shared_ptr;
  
  
  class DrawStrategy;
  class TimelineViewWindow;

  /**
   * Base class for timeline entities.
   * Everything that can be placed on the timeline is a timeline Entity.
   */
  class Entity {
  protected:

    Entity (shared_ptr<timeline::DrawStrategy> drawStrategy);

    virtual ~Entity();

  public:

    
    virtual void
    draw(Cairo::RefPtr<Cairo::Context> cairo,
      TimelineViewWindow* const window) const;

    bool
    getEnabled () const;

    virtual Time
    getBegin () const = 0;
    
    virtual Time
    getEnd () const = 0;

    virtual std::string
    getName () const = 0;

    void
    setEnabled(bool selected);

  private:

    bool enabled;

    shared_ptr<timeline::DrawStrategy> drawStrategy;
  };

}   // namespace timeline
}   // namespace widgets
}   // namespace gui

#endif // TIMELINE_ENTITY_HPP
