Function NextOrPrevFrame

src/menus/NavigationMenus.cpp:23–71

namespace {

void NextOrPrevFrame(AudacityProject &project, bool forward)
{
   // Focus won't take in a dock unless at least one descendant window
   // accepts focus.  Tell controls to take focus for the duration of this
   // function, only.  Outside of this, they won't steal the focus when
   // clicked.
   auto temp1 = AButton::TemporarilyAllowFocus();
   auto temp2 = ASlider::TemporarilyAllowFocus();
   auto temp3 = MeterPanel::TemporarilyAllowFocus();
   
   std::vector<wxWindow*> seq;
   // Skip docks that are empty (Bug 1564).
   if(!ToolManager::Get(project).GetTopDock()->GetChildren().IsEmpty())
      seq.push_back(ProjectWindow::Get( project ).GetTopPanel());
   seq.push_back(&TrackPanel::Get( project ));
   seq.push_back(&RealtimeEffectPanel::Get(project));
   if(!ToolManager::Get( project ).GetBotDock()->GetChildren().IsEmpty())
      seq.push_back(ToolManager::Get( project ).GetBotDock());

   auto FindAncestor = [&]() {
      wxWindow *pWindow = wxWindow::FindFocus();
      while (pWindow)
      {
         auto it = std::find(seq.cbegin(), seq.cend(), pWindow);
         if(it != seq.cend())
            return static_cast<size_t>(std::distance(seq.cbegin(), it));
         pWindow = pWindow->GetParent();
      }
      return seq.size();
   };

   const auto idx = FindAncestor();
   if (idx == seq.size())
      return;

   auto idx2 = idx;
   const auto increment = (forward ? 1 : static_cast<int>(seq.size()) - 1);

   while( idx != (idx2 = (idx2 + increment) % seq.size()) ) {
      wxWindow *toFocus = seq[idx2];
      if(!toFocus->IsShown())
         continue;

      toFocus->SetFocus();
      if ( FindAncestor() == idx2 )
         // The focus took!
         break;
   }
}

/// \todo Merge related methods, OnPrevTrack and OnNextTrack.
void DoPrevTrack(