Logo Search packages:      
Sourcecode: ardour version File versions  Download package

auto_spin.cc

/*
    Copyright (C) 1999 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.cc,v 1.9 2005/07/26 21:48:51 sampo Exp $
*/

#include <gtkmmext/auto_spin.h>
#include <cmath>

using namespace Gtkmmext;
using namespace std;

#define upper          adjustment.gtkobj()->upper
#define lower          adjustment.gtkobj()->lower
#define step_increment adjustment.gtkobj()->step_increment
#define page_increment adjustment.gtkobj()->page_increment

const unsigned int AutoSpin::initial_timer_interval = 500;   /* msecs */
const unsigned int AutoSpin::timer_interval = 20;            /* msecs */
const unsigned int AutoSpin::climb_timer_calls = 5;    /* between climbing */

AutoSpin::AutoSpin (Gtk::Adjustment &adjr, gfloat cr, bool round_to_steps_yn) 
      : adjustment (adjr),
        climb_rate (cr)

{
      initial = GTK_ADJUSTMENT(adjustment.gtkobj())->value;
      left_is_decrement = true;
      wrap = false;
      have_timer = false;
      need_timer = false;
      timer_calls = 0;
      round_to_steps = round_to_steps_yn;
}

void
AutoSpin::stop_timer ()
{
      if (have_timer) {
            gtk_timeout_remove (timeout_tag);
            have_timer = false;     
      }
}

gint
AutoSpin::stop_spinning (GdkEventButton *ev)
{
      need_timer = false;
      stop_timer ();
      return FALSE;
}

gint
AutoSpin::button_press (GdkEventButton *ev)
{
      bool shifted = false;
      bool control = false;
      bool with_decrement = false;

      stop_spinning (0);

      if (ev->state & GDK_SHIFT_MASK) {
            /* use page shift */

            shifted = true;
      }

      if (ev->state & GDK_CONTROL_MASK) {
            /* go to upper/lower bound on button1/button2 */

            control = true;
      }

      /* XXX should figure out which button is left/right */

      switch (ev->button) {
      case 1:
            if (control) {
                  set_value (left_is_decrement ? lower : upper);
                  return TRUE;
            } else {
                  if (left_is_decrement) {
                        with_decrement = true;
                  } else {
                        with_decrement = false;
                  }
            }
            break;

      case 2:
            if (!control) {
                  set_value (initial);
            }
            return TRUE;
            break;

      case 3:
            if (control) {
                  set_value (left_is_decrement ? upper : lower);
                  return TRUE;
            }
            break;

      case 4:
            if (!control) {
                  adjust_value (shifted ? page_increment : step_increment);
            } else {
                  set_value (upper);
            }
            return TRUE;
            break;

      case 5:
            if (!control) {
                  adjust_value (shifted ? -page_increment : -step_increment);
            } else {
                  set_value (lower);
            }
            return TRUE;
            break;
      } 

      start_spinning (with_decrement, shifted);
      return TRUE;
}

void
AutoSpin::start_spinning (bool decrement, bool page)
{
      timer_increment = page ? page_increment : step_increment;

      if (decrement) { 
            timer_increment = -timer_increment;
      }

      adjust_value (timer_increment);
      
      have_timer = true;
      timer_calls = 0;
      timeout_tag = gtk_timeout_add (initial_timer_interval,
                               AutoSpin::_timer,
                               this);
}

gint
AutoSpin::_timer (void *arg)
{
      return ((AutoSpin *) arg)->timer ();
}

void
AutoSpin::set_value (gfloat value)
{
      if (round_to_steps)
            adjustment.set_value (floor((value / step_increment) + 0.5f) * step_increment);
      else
            adjustment.set_value (value);
}

bool
AutoSpin::adjust_value (gfloat increment)
{
      gfloat val;
      bool done = false;

      val = adjustment.get_value();

      val += increment;

      if (val > upper) {
            if (wrap) {
                  val = lower;
            } else {
                  val = upper;
                  done = true;
            }
      } else if (val < lower) {
            if (wrap) {
                  val = upper;
            } else {
                  val = lower;
                  done = true;
            }
      }

      set_value(val);
      return done;
}

gint
AutoSpin::timer ()
{
      bool done;
      int retval = FALSE;

      done = adjust_value (timer_increment);

      if (need_timer) {

            /* we're in the initial call, which happened
               after initial_timer_interval msecs. Now
               request a much more frequent update.
            */
            
            timeout_tag = gtk_timeout_add (timer_interval,
                                     _timer,
                                     this);
            have_timer = true;
            need_timer = false;

            /* cancel this initial timeout */
            
            retval = FALSE;

      } else { 
            /* this is the regular "fast" call after each
               timer_interval msecs. 
            */

            if (timer_calls < climb_timer_calls) {
                  timer_calls++;
            } else {
                  if (climb_rate > 0.0) {
                        if (timer_increment > 0) {
                              timer_increment += climb_rate;
                        } else {
                              timer_increment -= climb_rate;
                        }
                  }
                  timer_calls = 0;
            }

            if (!done) {
                  retval = TRUE;
            }
      }

      return retval;
}     

void
AutoSpin::set_bounds (gfloat init, gfloat up, gfloat down, bool with_reset)
{
      upper = up;
      lower = down;

      initial = init;
      
      adjustment.changed ();

      if (with_reset) {
            adjustment.set_value (init);
      }
} 

Generated by  Doxygen 1.6.0   Back to index