Function FindPathName

src/widgets/BasicMenu.cpp:59–90

Find a path name for the id in the given menu, but only if it, and each sub-menu above it, is uniquely named among peer items

// Find a path name for the id in the given menu, but only if it, and
// each sub-menu above it, is uniquely named among peer items
std::optional< wxArrayStringEx > FindPathName( wxMenu &theMenu, int id )
{
   wxMenuItem *pItem = nullptr;
   wxMenu *pSubMenu = nullptr;
   if ( !( pItem = theMenu.FindItem( id, &pSubMenu ) ) )
      return std::nullopt;

   // Gather path components, checking uniqueness at each level
   wxArrayStringEx names;
   for ( ; pSubMenu; pSubMenu = pSubMenu->GetParent() ) {
      const auto &items = pSubMenu->GetMenuItems();
      const auto begin = items.begin(), end = items.end();
      if ( !names.empty() ) {
         // Update pItem on second and later passes
         if ( const auto iter = std::find_if( begin, end,
               [&]( auto pNewItem ){
                  return pNewItem->GetSubMenu() == pItem->GetMenu(); } );
             iter == end )
            return std::nullopt;
         else
            pItem = *iter;
      }
      auto name = pItem->GetItemLabelText();
      if ( 1 != std::count_if( begin, end, [&](auto item){
            return item->GetItemLabelText() == name; } ) )
         // nonuniqueness
         return std::nullopt;
      names.push_back( name );
   }
   std::reverse( names.begin(), names.end() );
   return { names };
}

//! Singleton object listens to global wxEvent stream
struct Watcher : wxEventFilter