Method Children

src/TrackPanel.cpp:1459–1486

struct Subgroup final : TrackPanelGroup {
   explicit Subgroup(TrackPanel &panel) : mPanel{ panel } {}
   Subdivision Children(const wxRect &rect) override
   {
      const auto &viewInfo = *mPanel.GetViewInfo();
      wxCoord yy = -viewInfo.vpos;
      Refinement refinement;

      auto &tracks = *mPanel.GetTracks();
      if (!tracks.empty())
         refinement.emplace_back( yy, EmptyCell::Instance() ),
         yy += kTopMargin;

      for (const auto pTrack : tracks) {
         wxCoord height = 0;
         for (auto pChannel : pTrack->Channels()) {
            auto &view = ChannelView::Get(*pChannel);
            height += view.GetHeight();
         }
         refinement.emplace_back( yy,
            std::make_shared<ResizingChannelGroup>(
               pTrack->SharedPointer(), viewInfo.GetLeftOffset())
         );
         yy += height;
      }

      refinement.emplace_back(std::max(0, yy), mPanel.GetBackgroundCell());

      return { Axis::Y, std::move(refinement) };
   }
   TrackPanel &mPanel;
};