Added wxFrameBase::OnMenuOpen, and wxUSE_IDLEMENUUPDATES in platform.h

Experimental wxUpdateUIEvent::SetUpdateInterval() function to limit
UI update frequency


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@21746 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/platform.h

@@ -327,5 +327,17 @@
     #endif
 #endif
 
+/* Choose which method we will use for updating menus
+ * - in OnIdle, or when we receive a wxEVT_MENU_OPEN event.
+ * Presently, only Windows and GTK+ support wxEVT_MENU_OPEN.
+ */
+#ifndef wxUSE_IDLEMENUUPDATES
+    #if defined(__WXMSW__) || defined(__WXGTK__)
+        #define wxUSE_IDLEMENUUPDATES 0
+    #else
+        #define wxUSE_IDLEMENUUPDATES 1
+    #endif
+#endif
+
 #endif /* _WX_PLATFORM_H_ */