NoteTrackEditing.cpp

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/*  SPDX-License-Identifier: GPL-2.0-or-later */
/*!********************************************************************
 
  Audacity: A Digital Audio Editor
 
  @file NoteTrackEditing.cpp
 
  PaulLicameli
 
**********************************************************************/
#include "WrapAllegro.h"
#include "NoteTrack.h"
#include "TempoChange.h"
 
using OnNoteTrackProjectTempoChange = OnProjectTempoChange::Override<NoteTrack>;
DEFINE_ATTACHED_VIRTUAL_OVERRIDE(OnNoteTrackProjectTempoChange) {
   return [](NoteTrack &track,
      const std::optional<double> &oldTempo, double newTempo)
   {
      if (!oldTempo.has_value())
         return;
      const auto ratio = *oldTempo / newTempo;
      auto& seq = track.GetSeq();
      seq.convert_to_beats();
      const auto b1 = seq.get_dur();
      seq.convert_to_seconds();
      const auto newDuration = seq.get_dur() * ratio;
      seq.stretch_region(0, b1, newDuration);
      seq.set_real_dur(newDuration);
   };
}