Function MoveWhenAudioInactive

src/menus/SelectMenus.cpp:209–266

Moving a cursor, and collapsed selection.

// Moving a cursor, and collapsed selection.
void MoveWhenAudioInactive
(AudacityProject &project, double seekStep, TimeUnit timeUnit)
{
   auto &viewInfo = ViewInfo::Get(project);
   auto &trackPanel = TrackPanel::Get(project);
   auto &tracks = TrackList::Get(project);
   auto &ruler = AdornedRulerPanel::Get(project);
   const auto &settings = ProjectSnap::Get(project);
   auto &viewport = Viewport::Get(project);

   // If TIME_UNIT_SECONDS, snap-to will be off.
   auto snapMode = settings.GetSnapMode();

   // Move the cursor
   // Already in cursor mode?
   if (viewInfo.selectedRegion.isPoint())
   {
      double newT = OffsetTime(
         project, viewInfo.selectedRegion.t0(), seekStep, timeUnit, snapMode);
      // constrain.
      newT = std::max(0.0, newT);
      // Move
      viewInfo.selectedRegion.setT0(
         newT,
         false); // do not swap selection boundaries
      viewInfo.selectedRegion.collapseToT0();

      // Move the visual cursor, avoiding an unnecessary complete redraw
      trackPanel.DrawOverlays(false);
      ruler.DrawOverlays(false);
   }
   else
   {
      // Transition to cursor mode.
      constexpr auto maySwapBoundaries = false;
      if (seekStep < 0)
      {
         if (snapMode != SnapMode::SNAP_OFF)
            viewInfo.selectedRegion.setT0(
               settings.SnapTime(viewInfo.selectedRegion.t0()).time,
               maySwapBoundaries);
         viewInfo.selectedRegion.collapseToT0();
      }
      else
      {
         if (snapMode != SnapMode::SNAP_OFF)
            viewInfo.selectedRegion.setT1(
               settings.SnapTime(viewInfo.selectedRegion.t1()).time,
               maySwapBoundaries);
         viewInfo.selectedRegion.collapseToT1();
      }
      trackPanel.Refresh(false);
   }

   // Make sure NEW position is in view
   viewport.ScrollIntoView(viewInfo.selectedRegion.t1());
   return;
}