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auto_spin.h

/*
    Copyright (C) 2000 Paul Barton-Davis 

    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.

    $Id: auto_spin.h,v 1.3 2005/07/26 21:47:31 sampo Exp $
*/

#ifndef __gtkmmext_auto_spin_h__
#define __gtkmmext_auto_spin_h__

#include <gtk--.h>

namespace Gtkmmext {

class AutoSpin : public SigC::Object

{
  public:
      AutoSpin (Gtk::Adjustment &adj, gfloat cr = 0, bool round_to_steps_yn = false);

      Gtk::Adjustment &get_adjustment() { return adjustment; }

      void use_left_as_decrement (bool yn) { left_is_decrement = yn; }
      void set_wrap (bool yn) { wrap = yn; }
      void set_climb_rate (gfloat cr) { climb_rate = cr; }
      void set_bounds (gfloat initial, gfloat low, gfloat high,
                   bool with_reset = true);

      gint button_press (GdkEventButton *);
      gint stop_spinning (GdkEventButton *ignored_but_here_for_clicked);
      void start_spinning (bool decrementing, bool use_page);

  private:
      Gtk::Adjustment &adjustment;
      gfloat climb_rate;
      gfloat timer_increment;
      gfloat initial;
      unsigned int timer_calls;
      bool have_timer;
      bool need_timer;
      bool wrap;
      gint timeout_tag;
      bool left_is_decrement;
      bool round_to_steps;

      static const unsigned int initial_timer_interval;
      static const unsigned int timer_interval;
      static const unsigned int climb_timer_calls;

      void stop_timer ();
      static gint _timer (void *arg);
      gint timer ();
      bool adjust_value (gfloat increment);
      void set_value (gfloat value);
};

} /* namespace */
      
#endif /* __gtkmmext_auto_spin_h__ */

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