FWPopupMenu.cc

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#include "TGMenu.h"
#include "KeySymbols.h"

class FWPopupMenu : public TGPopupMenu
{
public:
   FWPopupMenu(const TGWindow* p=nullptr, UInt_t w=10, UInt_t h=10, UInt_t options=0) :
      TGPopupMenu(p, w, h, options)
   {
      AddInput(kKeyPressMask);
   }

   // virtual void  PlaceMenu(Int_t x, Int_t y, Bool_t stick_mode, Bool_t grab_pointer)
   // {
   //    TGPopupMenu::PlaceMenu(x, y, stick_mode, grab_pointer);
   //    gVirtualX->GrabKey(fId, 0l, kAnyModifier, kTRUE);
   // }

   void PoppedUp() override
   {
      TGPopupMenu::PoppedUp();
      gVirtualX->SetInputFocus(fId);
      gVirtualX->GrabKey(fId, 0l, kAnyModifier, kTRUE);
      
   }

   void PoppedDown() override
   {
      gVirtualX->GrabKey(fId, 0l, kAnyModifier, kFALSE);
      TGPopupMenu::PoppedDown();
   }

   Bool_t HandleKey(Event_t* event) override
   {
      if (event->fType != kGKeyPress) return kTRUE;

      UInt_t keysym;
      char tmp[2];
      gVirtualX->LookupString(event, tmp, sizeof(tmp), keysym);

      TGMenuEntry *ce = fCurrent;

      switch (keysym)
      {
         case kKey_Up:
         {
            if (ce) ce = (TGMenuEntry*)GetListOfEntries()->Before(ce);
            while (ce && ((ce->GetType() == kMenuSeparator) ||
                          (ce->GetType() == kMenuLabel) ||
                          !(ce->GetStatus() & kMenuEnableMask)))
            {
               ce = (TGMenuEntry*)GetListOfEntries()->Before(ce);
            }
            if (!ce) ce = (TGMenuEntry*)GetListOfEntries()->Last();
            Activate(ce);
            break;
         }
         case kKey_Down:
         {
            if (ce) ce = (TGMenuEntry*)GetListOfEntries()->After(ce);
            while (ce && ((ce->GetType() == kMenuSeparator) ||
                          (ce->GetType() == kMenuLabel) ||
                          !(ce->GetStatus() & kMenuEnableMask)))
            {
               ce = (TGMenuEntry*)GetListOfEntries()->After(ce);
            }
            if (!ce) ce = (TGMenuEntry*)GetListOfEntries()->First();
            Activate(ce);
            break;
         }
         case kKey_Enter:
         case kKey_Return:
         {
            Event_t ev;
            ev.fType = kButtonRelease;
            ev.fWindow = fId;
            return HandleButton(&ev);
         }
         case kKey_Escape:
         {
            fCurrent = nullptr;
            void *dummy = nullptr;
            return EndMenu(dummy);
         }
         default:
         {
            break;
         }
      }

      return kTRUE;
   }
};