//  $Id: scroller.hpp 3059 2007-09-02 03:48:52Z grumbel $
//
//  Pingus - A free Lemmings clone
//  Copyright (C) 2000 Ingo Ruhnke <grumbel@gmx.de>
//
//  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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.

#ifndef HEADER_PINGUS_INPUT_SCROLLER_HXX
#define HEADER_PINGUS_INPUT_SCROLLER_HXX

#include "../pingus.hpp"

namespace Input {

/// abstract base class defining the scroller interface
class Scroller {
public:
  Scroller() { }
  virtual ~Scroller() { }

  /// returns the scroll delta in X direction
  virtual const float& get_x_delta() const =0;

  /// returns the scroll delta in Y direction
  virtual const float& get_y_delta() const =0;

  /// writes the X/Y scroll delta into it's parameters
  virtual void get_delta(float&, float&) const =0;

  virtual void update(float) =0;

private:
  Scroller(const Scroller&);
  Scroller& operator= (const Scroller&);
};

} // namespace Input

#endif

/* EOF */