add wxUSE_WEAKREF (modified partially applied patch 1870445)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@51614 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/event.h

@@ -2258,7 +2258,10 @@ protected:
 // wxEvtHandler: the base class for all objects handling wxWidgets events
 // ----------------------------------------------------------------------------
 
-class WXDLLIMPEXP_BASE wxEvtHandler : public wxObject, public wxTrackable
+class WXDLLIMPEXP_BASE wxEvtHandler : public wxObject
+#if wxUSE_WEAKREF
+                                    , public wxTrackable
+#endif
 {
 public:
     wxEvtHandler();
@@ -2358,7 +2361,9 @@ public:
 
     // Avoid problems at exit by cleaning up static hash table gracefully
     void ClearEventHashTable() { GetEventHashTable().Clear(); }
+#if wxUSE_WEAKREF
     void OnSinkDestroyed( wxEvtHandler *sink );
+#endif
 
 private:
     static const wxEventTableEntry sm_eventTableEntries[];
@@ -2425,13 +2430,16 @@ protected:
     virtual void DoSetClientData( void *data );
     virtual void *DoGetClientData() const;
 
+#if wxUSE_WEAKREF
     // Search tracker objects for event connection with this sink
     wxEventConnectionRef *FindRefInTrackerList(wxEvtHandler *eventSink);
+#endif
 
 private:
     DECLARE_DYNAMIC_CLASS_NO_COPY(wxEvtHandler)
 };
 
+#if wxUSE_WEAKREF
 // ----------------------------------------------------------------------------
 // wxEventConnectionRef represents all connections between two event handlers
 // and enables automatic disconnect when an event handler sink goes out of
@@ -2480,6 +2488,7 @@ private:
 
     DECLARE_NO_ASSIGN_CLASS(wxEventConnectionRef)
 };
+#endif // wxUSE_WEAKREF
 
 // Post a message to the given eventhandler which will be processed during the
 // next event loop iteration