gtk2_ardour/volume_controller.h

   1 /*
   2     Copyright (C) 1998-2007 Paul Davis
   3     This program is free software; you can redistribute it and/or modify
   4     it under the terms of the GNU General Public License as published by
   5     the Free Software Foundation; either version 2 of the License, or
   6     (at your option) any later version.
   7
   8     This program is distributed in the hope that it will be useful,
   9     but WITHOUT ANY WARRANTY; without even the implied warranty of
  10     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11     GNU General Public License for more details.
  12
  13     You should have received a copy of the GNU General Public License
  14     along with this program; if not, write to the Free Software
  15     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  16
  17     $Id: volume_controller.h,v 1.4 2000/05/03 15:54:21 pbd Exp $
  18 */
  19
  20 #ifndef __gtk_ardour_vol_controller_h__
  21 #define __gtk_ardour_vol_controller_h__
  22
  23 #include <gtkmm/adjustment.h>
  24
  25 #include "gtkmm2ext/motionfeedback.h"
  26
  27 class VolumeController : public Gtkmm2ext::MotionFeedback
  28 {
  29   public:
  30         VolumeController (Glib::RefPtr<Gdk::Pixbuf>,
  31                           boost::shared_ptr<PBD::Controllable>,
  32                           double def,
  33                           double step,
  34                           double page,
  35                           bool with_numeric = true,
  36                           int image_width = 40,
  37                           int image_height = 40,
  38                           bool linear = true);
  39
  40         virtual ~VolumeController () {}
  41
  42         static void _dB_printer (char buf[32], const boost::shared_ptr<PBD::Controllable>& adj, void* arg);
  43
  44   protected:
  45         double to_control_value (double);
  46         double to_display_value (double);
  47         double adjust (double nominal_delta);
  48
  49         double display_value () const;
  50         double control_value () const;
  51
  52   private:
  53         bool _linear;
  54
  55         void dB_printer (char buf[32], const boost::shared_ptr<PBD::Controllable>& adj);
  56 };
  57
  58 #endif // __gtk_ardour_vol_controller_h__
  59
  60