libs/ardour/automation_control.cc

   1 /*
   2     Copyright (C) 2007 Paul Davis
   3     Author: David Robillard
   4
   5     This program is free software; you can redistribute it and/or modify
   6     it under the terms of the GNU General Public License as published by
   7     the Free Software Foundation; either version 2 of the License, or
   8     (at your option) any later version.
   9
  10     This program is distributed in the hope that it will be useful,
  11     but WITHOUT ANY WARRANTY; without even the implied warranty of
  12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13     GNU General Public License for more details.
  14
  15     You should have received a copy of the GNU General Public License
  16     along with this program; if not, write to the Free Software
  17     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  18
  19 */
  20
  21 #include <iostream>
  22 #include "ardour/automatable.h"
  23 #include "ardour/automation_control.h"
  24 #include "ardour/event_type_map.h"
  25 #include "ardour/session.h"
  26
  27 using namespace std;
  28 using namespace ARDOUR;
  29 using namespace PBD;
  30
  31
  32 AutomationControl::AutomationControl(
  33                 ARDOUR::Session& session,
  34                 const Evoral::Parameter& parameter,
  35                 boost::shared_ptr<ARDOUR::AutomationList> list,
  36                 const string& name)
  37         : Controllable (name.empty() ? EventTypeMap::instance().to_symbol(parameter) : name)
  38         , Evoral::Control(parameter, list)
  39         , _session(session)
  40 {
  41 }
  42
  43 /** Get the current effective `user' value based on automation state */
  44 double
  45 AutomationControl::get_value() const
  46 {
  47         bool from_list = _list && ((AutomationList*)_list.get())->automation_playback();
  48         return Control::get_double (from_list, _session.transport_frame());
  49 }
  50
  51 /** Set the value and do the right thing based on automation state
  52  *  (e.g. record if necessary, etc.)
  53  *  @param value `user' value
  54  */
  55 void
  56 AutomationControl::set_value(double value)
  57 {
  58         bool to_list = _list && _session.transport_stopped()
  59                 && ((AutomationList*)_list.get())->automation_write();
  60
  61         if (to_list && parameter().toggled()) {
  62
  63                 // store the previous value just before this so any
  64                 // interpolation works right
  65
  66                 _list->add (get_double(), _session.transport_frame()-1);
  67         }
  68
  69         Control::set_double (value, to_list, _session.transport_frame());
  70
  71         Changed(); /* EMIT SIGNAL */
  72 }
  73
  74
  75 void
  76 AutomationControl::set_list(boost::shared_ptr<Evoral::ControlList> list)
  77 {
  78         Control::set_list(list);
  79         Changed();  /* EMIT SIGNAL */
  80 }
  81