libs/gtkmm2ext/bindable_button.cc

   1 /*
   2     Copyright (C) 2004 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     $Id$
  18 */
  19
  20 #include <string>
  21 #include <iostream>
  22
  23 #include "pbd/controllable.h"
  24
  25 #include "gtkmm2ext/gtk_ui.h"
  26 #include "gtkmm2ext/bindable_button.h"
  27 #include "gtkmm2ext/gui_thread.h"
  28
  29 #include "i18n.h"
  30
  31 using namespace Gtkmm2ext;
  32 using namespace std;
  33 using namespace PBD;
  34
  35 void
  36 BindableToggleButton::set_controllable (boost::shared_ptr<PBD::Controllable> c)
  37 {
  38         watch_connection.disconnect ();
  39         binding_proxy.set_controllable (c);
  40 }
  41
  42 void
  43 BindableToggleButton::watch ()
  44 {
  45         boost::shared_ptr<Controllable> c (binding_proxy.get_controllable ());
  46
  47         if (!c) {
  48                 warning << _("button cannot watch state of non-existing Controllable\n") << endl;
  49                 return;
  50         }
  51
  52         c->Changed.connect (watch_connection, invalidator(*this), boost::bind (&BindableToggleButton::controllable_changed, this), gui_context());
  53 }
  54
  55 void
  56 BindableToggleButton::controllable_changed ()
  57 {
  58         float val = binding_proxy.get_controllable()->get_value();
  59         set_active (fabs (val) >= 0.5f);
  60 }