adding empty base class implementation for OnNextIteration, call from OSXDoRun, allowing console event loop to override

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76223 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/osx/core/evtloop.h

@@ -55,6 +55,10 @@ protected:
     // terminating when Exit() is called
     virtual int DoRun();
 
+    // may be overridden to perform some action at the start of each new event
+    // loop iteration
+    virtual void OnNextIteration() {}
+
     virtual void DoYieldFor(long eventsToProcess);
 
     void CommonModeObserverCallBack(CFRunLoopObserverRef observer, int activity);

src/osx/core/evtloop_cf.cpp

@@ -272,6 +272,8 @@ void wxCFEventLoop::OSXDoRun()
 {
     for ( ;; )
     {
+        OnNextIteration();
+
         // generate and process idle events for as long as we don't
         // have anything else to do
         DoProcessEvents();