Refactor wxEventLoopSource-related code.

Currently wxEventLoopSource can't be created directly and can only be used to
monitor file descriptors so reduce the API to just wxEventLoop::AddSourceForFD()
and remove AddSource(), RemoveSource() and RemoveAllSources() which couldn't
be implemented for all ports. This makes the code much simpler without any
loss of functionality.

Make wxEventLoopSource responsible for removing itself from the event loop
when it is deleted. This allows to remove IsOk() and Invalidate() methods
making the code simpler and gets rid of various sets/maps which were used
before.

This also allows to support event loop sources in Carbon as well: wxOSX/Carbon
now compiles and works with wxUSE_FSWATCHER==1.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@62475 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/gtk/evtloop.h

@@ -17,17 +17,9 @@
 
 typedef union  _GdkEvent        GdkEvent;
 
-#if wxUSE_EVENTLOOP_SOURCE
-// maps event loop sources to gtk source ids
-WX_DECLARE_HASH_MAP(wxUnixEventLoopSource*, int, wxPointerHash, wxPointerEqual,
-                    wxEventLoopSourceIdMap);
-#endif
-
-class WXDLLIMPEXP_BASE wxGUIEventLoop : public wxEventLoopBase
+class WXDLLIMPEXP_CORE wxGUIEventLoop : public wxEventLoopBase
 {
 public:
-    typedef wxUnixEventLoopSource Source;
-
     wxGUIEventLoop();
 
     virtual int Run();
@@ -38,33 +30,15 @@ public:
     virtual void WakeUp();
     virtual bool YieldFor(long eventsToProcess);
 
+#if wxUSE_EVENTLOOP_SOURCE
+    virtual wxEventLoopSource *
+      AddSourceForFD(int fd, wxEventLoopSourceHandler *handler, int flags);
+#endif // wxUSE_EVENTLOOP_SOURCE
+
     void StoreGdkEventForLaterProcessing(GdkEvent* ev)
         { m_arrGdkEvents.Add(ev); }
 
-#if wxUSE_EVENTLOOP_SOURCE
-    virtual wxUnixEventLoopSource* CreateSource() const
-    {
-        return new wxUnixEventLoopSource();
-    }
-
-    virtual wxUnixEventLoopSource* CreateSource(int res,
-                                           wxEventLoopSourceHandler* handler,
-                                           int flags) const
-    {
-        return new wxUnixEventLoopSource(res, handler, flags);
-    }
-#endif
-
-protected:
-#if wxUSE_EVENTLOOP_SOURCE
-    // adding/removing sources
-    virtual bool DoAddSource(wxAbstractEventLoopSource* source);
-    virtual bool DoRemoveSource(wxAbstractEventLoopSource* source);
-
-    // map of event loop sources gtk ids
-    wxEventLoopSourceIdMap m_sourceIdMap;
-#endif
-
+private:
     // the exit code of this event loop
     int m_exitcode;