LabelTrackEditing.cpp File Reference

#include "LabelTrack.h"
#include "TempoChange.h"

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Typedefs
using	OnLabelTrackProjectTempoChange = OnProjectTempoChange::Override< LabelTrack >

Functions
	DEFINE_ATTACHED_VIRTUAL_OVERRIDE (OnLabelTrackProjectTempoChange)

Detailed Description

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Audacity: A Digital Audio Editor

PaulLicameli

Definition in file LabelTrackEditing.cpp.

Typedef Documentation

OnLabelTrackProjectTempoChange

using OnLabelTrackProjectTempoChange = OnProjectTempoChange::Override<LabelTrack>

Definition at line 14 of file LabelTrackEditing.cpp.

Function Documentation

DEFINE_ATTACHED_VIRTUAL_OVERRIDE()

DEFINE_ATTACHED_VIRTUAL_OVERRIDE

(

OnLabelTrackProjectTempoChange

)

Definition at line 16 of file LabelTrackEditing.cpp.

{
   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);
      }
   };
}

References LabelTrack::GetLabel(), LabelTrack::GetNumLabels(), label, and LabelTrack::SetLabel().

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