Method DoRemoveTracks

src/TrackUtilities.cpp:19–57

#include "Viewport.h"

void TrackUtilities::DoRemoveTracks(AudacityProject &project) {
   auto &tracks = TrackList::Get(project);
   auto &trackPanel = TrackPanel::Get(project);

   auto range = tracks.Selected();
   using Iter = decltype(range.begin());

   // Find the track preceding the first removed track
   std::optional<Iter> focus;
   if (!range.empty()) {
      auto iter = tracks.Find(*range.begin());
      // TrackIter allows decrement even of begin iterators
      focus.emplace(--iter);
   }

   while (!range.empty())
      tracks.Remove(**range.first++);

   if (!(focus.has_value() && **focus))
      // try to use the last track
      focus.emplace(tracks.end().advance(-1));
   assert(focus);
   Track *f = **focus;
   // Try to use the first track after the removal
   // TrackIter allows increment even of end iterators
   if (const auto nextF = * ++ *focus)
      f = nextF;

   // If we actually have something left, then set focus and make sure it's seen
   if (f) {
      TrackFocus::Get(project).Set(f);
      Viewport::Get(project).ShowTrack(*f);
   }

   ProjectHistory::Get(project)
      .PushState(XO("Removed audio track(s)"), XO("Remove Track"));

   trackPanel.UpdateViewIfNoTracks();
}

void TrackUtilities::DoTrackMute(
   AudacityProject &project, Track &track, bool exclusive)