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controller.cc

/*
    Copyright (C) 1998-99 Paul 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: controller.cc,v 1.3 2004/01/21 03:29:02 trutkin Exp $
*/

#include <string>
#include <climits>

#include <midi++/channel.h>
#include <gtkmmext/gtk_ui.h>
#include <gtkmmext/controller.h>

#include "i18n.h"

using namespace Gtkmmext;

Controller::Controller (Gtk::Adjustment *adj, MIDI::Port *p)
      : MIDI::Controllable (p),
        adjustment (adj),
        prompter (GTK_WIN_POS_MOUSE, 30000, false)
{
      new_value_pending = false;

      /* hear about MIDI control learning */

      learning_started.connect 
            (SigC::slot (this, &Controller::midicontrol_prompt));
      learning_stopped.connect 
            (SigC::slot (this, &Controller::midicontrol_unprompt));
}

void
Controller::midicontrol_prompt ()

{
      string prompt = _("operate MIDI controller now");

      prompter.set_text (prompt);
      Gtkmmext::UI::instance()->touch_display (&prompter);
}

void
Controller::midicontrol_unprompt ()

{
      Gtkmmext::UI::instance()->touch_display (&prompter);
}

int
Controller::update_controller_value (void *arg)

{
      Controller *c = (Controller *) arg;

      c->adjustment->set_value (c->new_value);
      c->new_value_pending = false;

      return FALSE;
}

void
Controller::set_value (float v)

{
      /* This is called from a MIDI callback. It could happen
         a thousand times a second, or more. Therefore, instead
         of going straight to the X server, which may not work for
         thread-related reasons, simply request an update whenever
         the GTK main loop is idle.
      */
      
      new_value = v;

      if (!new_value_pending) {
            new_value_pending = true;
            Gtkmmext::UI::instance()->idle_add (update_controller_value, this);
      }
}

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