Method TrackPanel

src/TrackPanel.cpp:257–350

#pragma warning( disable: 4355 )
#endif
TrackPanel::TrackPanel(wxWindow * parent, wxWindowID id,
                       const wxPoint & pos,
                       const wxSize & size,
                       const std::shared_ptr<TrackList> &tracks,
                       ViewInfo * viewInfo,
                       AudacityProject * project,
                       AdornedRulerPanel * ruler)
   : CellularPanel(parent, id, pos, size, viewInfo,
                   wxWANTS_CHARS | wxNO_BORDER),
     mTracks(tracks),
     mRuler(ruler),
     mTrackArtist(nullptr),
     mRefreshBacking(false),
     mIsPanning(false),
     mLastPanX(0)
#ifndef __WXGTK__   //Get rid if this pragma for gtk
#pragma warning( default: 4355 )
#endif
{
   SetLayoutDirection(wxLayout_LeftToRight);
   SetLabel(XO("Track Panel"));
   SetName(XO("Track Panel"));
   SetBackgroundStyle(wxBG_STYLE_PAINT);

#if wxUSE_ACCESSIBILITY
   // Inject finder of track rectangles into the accessibility helper
   {
      const auto finder = [
         weakThis = wxWeakRef<TrackPanel>{ this }
      ] (const Track &track) -> wxRect {
         if (weakThis)
            return weakThis->FindTrackRect(&track);
         return {};
      };
      auto &focus = TrackFocus::Get(*GetProject());
      auto &viewport = Viewport::Get(*GetProject());
      TrackPanelAx *pAx{};
      SetAccessible(pAx =
         safenew TrackPanelAx{
            viewport.weak_from_this(), focus.weak_from_this(), finder });
      focus.SetCallbacks(std::make_unique<TrackPanelAx::Adapter>(pAx));
   }
#endif

   mTrackArtist = std::make_unique<TrackArtist>( this );

   mTimeCount = 0;
   mTimer.parent = this;
   // Timer is started after the window is visible
   ProjectWindow::Get( *GetProject() ).Bind(wxEVT_IDLE,
      &TrackPanel::OnIdle, this);

   // Register for tracklist updates
   mTrackListSubscription = PendingTracks::Get(*GetProject())
   .Subscribe([this](const TrackListEvent &event){
      switch (event.mType) {
      case TrackListEvent::RESIZING:
      case TrackListEvent::ADDITION: