Method ProcessUIHandleResult

src/TrackPanel.cpp:551–617

}

void TrackPanel::ProcessUIHandleResult
   (TrackPanelCell *pClickedCell, TrackPanelCell *pLatestCell,
    UIHandle::Result refreshResult)
{
   const auto panel = this;
   auto pLatestTrack = FindTrack( pLatestCell ).get();

   // This precaution checks that the track is not only nonnull, but also
   // really owned by the track list
   auto pClickedTrack = GetTracks()->Lock(
      std::weak_ptr<Track>{ FindTrack( pClickedCell ) }
   ).get();

   // TODO:  make a finer distinction between refreshing the track control area,
   // and the waveform area.  As it is, redraw both whenever you must redraw either.

   // Copy data from the underlying tracks to the pending tracks that are
   // really displayed
   PendingTracks::Get(*panel->GetProject()).UpdatePendingTracks();

   using namespace RefreshCode;

   if (refreshResult & DestroyedCell) {
      panel->UpdateViewIfNoTracks();
      // Beware stale pointer!
      if (pLatestTrack == pClickedTrack)
         pLatestTrack = nullptr;
      pClickedTrack = nullptr;
   }

   if (pClickedTrack && (refreshResult & RefreshCode::UpdateVRuler))
      panel->UpdateVRuler(pClickedTrack);

   if (refreshResult & RefreshCode::DrawOverlays) {
      panel->DrawOverlays(false);
      mRuler->DrawOverlays(false);
   }

   // Refresh all if told to do so, or if told to refresh a track that
   // is not known.
   const bool refreshAll =
      (    (refreshResult & RefreshAll)
       || ((refreshResult & RefreshCell) && !pClickedTrack)
       || ((refreshResult & RefreshLatestCell) && !pLatestTrack));

   if (refreshAll)
      panel->Refresh(false);
   else {
      if (refreshResult & RefreshCell)
         panel->RefreshTrack(pClickedTrack);
      if (refreshResult & RefreshLatestCell)
         panel->RefreshTrack(pLatestTrack);
   }

   if (refreshResult & FixScrollbars)
      panel->MakeParentRedrawScrollbars();

   if (refreshResult & Resize)