Method ExpandCutLine

libraries/lib-wave-track/WaveTrackUtilities.cpp:305–350

Expand cut line (that is, re-insert audio, then DELETE audio saved in cut line) Can't yet promise strong exception safety for a pair of channels together

// Expand cut line (that is, re-insert audio, then DELETE audio saved in cut line)
// Can't yet promise strong exception safety for a pair of channels together
void WaveTrackUtilities::ExpandCutLine(WaveTrack &track,
   double cutLinePosition, double* cutlineStart,
   double* cutlineEnd)
{
   const bool editClipCanMove = GetEditClipsCanMove();

   // Find clip which contains this cut line
   double start = 0, end = 0;
   const auto &clips = track.Intervals();
   const auto pEnd = clips.end();
   const auto pClip = std::find_if(clips.begin(), pEnd,
      [&](const auto &clip) {
         return clip->FindCutLine(cutLinePosition, &start, &end); });
   if (pClip != pEnd) {
      auto &&clip = *pClip;
      if (!editClipCanMove) {
         // We are not allowed to move the other clips, so see if there
         // is enough room to expand the cut line
         for (const auto &clip2: clips)
            if (clip2->GetPlayStartTime() > clip->GetPlayStartTime() &&
                clip->GetPlayEndTime() + end - start > clip2->GetPlayStartTime())
               // Strong-guarantee in case of this path
               throw SimpleMessageBoxException{
                  ExceptionType::BadUserAction,
                  XO("There is not enough room available to expand the cut line"),
                  XO("Warning"),
                  "Error:_Insufficient_space_in_track"
               };
      }

      clip->ExpandCutLine(cutLinePosition);

      // Strong-guarantee provided that the following gives No-fail-guarantee

      if (cutlineStart)
         *cutlineStart = start;
      if (cutlineEnd)
         *cutlineEnd = end;

      // Move clips which are to the right of the cut line
      if (editClipCanMove)
         for (const auto &clip2 : clips)
            if (clip2->GetPlayStartTime() > clip->GetPlayStartTime())
               clip2->ShiftBy(end - start);
   }
}

bool WaveTrackUtilities::HasHiddenData(const WaveTrack &track)
{