LabelTrackEditing.cpp

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/*  SPDX-License-Identifier: GPL-2.0-or-later */
/*!********************************************************************
 
  Audacity: A Digital Audio Editor
 
  @file LabelTrackEditing.cpp
 
  PaulLicameli
 
**********************************************************************/
#include "LabelTrack.h"
#include "TempoChange.h"
 
using OnLabelTrackProjectTempoChange =
   OnProjectTempoChange::Override<LabelTrack>;
DEFINE_ATTACHED_VIRTUAL_OVERRIDE(OnLabelTrackProjectTempoChange)
{
   return [](LabelTrack& track, const std::optional<double>& oldTempo,
             double newTempo) {
      if (!oldTempo.has_value())
         return;
      const auto ratio = *oldTempo / newTempo;
      const size_t nn = track.GetNumLabels();
      for (size_t ii = 0; ii < nn; ++ii)
      {
         auto label = *track.GetLabel(ii);
         label.selectedRegion.setTimes(
            label.getT0() * ratio, label.getT1() * ratio);
         track.SetLabel(ii, label);
      }
   };
}