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region_gain_line.cc

/*
    Copyright (C) 2000-2007 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.

*/

#include <ardour/curve.h>
#include <ardour/audioregion.h>
#include <pbd/memento_command.h>

#include "region_gain_line.h"
#include "audio_region_view.h"
#include "utils.h"

#include "time_axis_view.h"
#include "editor.h"

#include <ardour/session.h>


#include "i18n.h"


using namespace std;
using namespace ARDOUR;
using namespace PBD;

AudioRegionGainLine::AudioRegionGainLine (const string & name, Session& s, AudioRegionView& r, ArdourCanvas::Group& parent, Curve& c)
  : AutomationLine (name, r.get_time_axis_view(), parent, c),
        session (s),
        rv (r)
{
      group->raise_to_top ();
      group->property_y() = 2;
      set_verbose_cursor_uses_gain_mapping (true);
      terminal_points_can_slide = false;
}

void
AudioRegionGainLine::view_to_model_y (double& y)
{
      y = slider_position_to_gain (y);
      y = max (0.0, y);
      y = min (2.0, y);
}

void
AudioRegionGainLine::model_to_view_y (double& y)
{
      if (y < 0) y = 0;

      y = gain_to_slider_position (y);
}

void
AudioRegionGainLine::start_drag (ControlPoint* cp, nframes_t x, float fraction) 
{
      AutomationLine::start_drag (cp, x, fraction);
      if (!rv.audio_region()->envelope_active()) {
                trackview.session().add_command(new MementoCommand<AudioRegion>(*(rv.audio_region().get()), &rv.audio_region()->get_state(), 0));
                rv.audio_region()->set_envelope_active(false);
      } 
}

// This is an extended copy from AutomationList
void
AudioRegionGainLine::remove_point (ControlPoint& cp)
{
      ModelRepresentation mr;

      model_representation (cp, mr);

      trackview.editor.current_session()->begin_reversible_command (_("remove control point"));
        XMLNode &before = alist.get_state();

      if (!rv.audio_region()->envelope_active()) {
                XMLNode &region_before = rv.audio_region()->get_state();
            rv.audio_region()->set_envelope_active(true);
                XMLNode &region_after = rv.audio_region()->get_state();
                trackview.session().add_command(new MementoCommand<AudioRegion>(*(rv.audio_region().get()), &region_before, &region_after));
      } 
      
      alist.erase (mr.start, mr.end);

      trackview.editor.current_session()->add_command (new MementoCommand<AutomationList>(alist, &before, &alist.get_state()));
      trackview.editor.current_session()->commit_reversible_command ();
      trackview.editor.current_session()->set_dirty ();
}

void
AudioRegionGainLine::end_drag (ControlPoint* cp) 
{
      if (!rv.audio_region()->envelope_active()) {
            rv.audio_region()->set_envelope_active(true);
                trackview.session().add_command(new MementoCommand<AudioRegion>(*(rv.audio_region().get()), 0, &rv.audio_region()->get_state()));
      } 

      AutomationLine::end_drag(cp);
}



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