+bool wxComboCtrl::IsKeyPopupToggle(const wxKeyEvent& event) const
+{
+ const bool isPopupShown = IsPopupShown();
+
+ switch ( event.GetKeyCode() )
+ {
+ case WXK_F4:
+ // F4 toggles the popup in the native comboboxes, so emulate them
+ if ( !event.AltDown() )
+ return true;
+ break;
+
+ case WXK_ESCAPE:
+ if ( isPopupShown )
+ return true;
+ break;
+
+ case WXK_DOWN:
+ case WXK_UP:
+ // On XP or with writable combo in Classic, arrows don't open the
+ // popup but Alt-arrow does
+ if ( event.AltDown() ||
+ ( !isPopupShown &&
+ HasFlag(wxCB_READONLY) &&
+ !wxUxThemeEngine::GetIfActive()
+ ) )
+ {
+ return true;
+ }
+ break;
+ }
+
+ return false;
+}