create the single global IO dispatcher in wxFDIODispatcher; don't use wxSelectDispatcher in wxGSocket as the global dispatcher may be of a different type (modified patch 1733626)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@47471 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/private/fdiodispatcher.h

@@ -45,6 +45,18 @@ class WXDLLIMPEXP_BASE wxFDIODispatcher
 public:
     enum { TIMEOUT_INFINITE = -1 };
 
+    // return the global dispatcher to be used for IO events, can be NULL only
+    // if wxSelectDispatcher wasn't compiled into the library at all as
+    // creating it never fails
+    //
+    // don't delete the returned pointer
+    static wxFDIODispatcher *Get();
+
+    // if we have any registered handlers, check for any pending events to them
+    // and dispatch them -- this is used from wxX11 and wxDFB event loops
+    // implementation
+    static void DispatchPending();
+
     // register handler for the given descriptor with the dispatcher, return
     // true on success or false on error
     virtual bool RegisterFD(int fd, wxFDIOHandler *handler, int flags) = 0;

include/wx/private/selectdispatcher.h

@@ -76,14 +76,8 @@ private:
 class WXDLLIMPEXP_BASE wxSelectDispatcher : public wxMappedFDIODispatcher
 {
 public:
-    // returns the unique instance of this class, the pointer shouldn't be
-    // deleted and is normally never NULL
-    static wxSelectDispatcher *Get();
-
-    // if we have any registered handlers, check for any pending events to them
-    // and dispatch them -- this is used from wxX11 and wxDFB event loops
-    // implementation
-    static void DispatchPending();
+    // creates an instance of this class, the caller takes ownership of it
+    static wxSelectDispatcher *Create();
 
     // implement pure virtual methods of the base class
     virtual bool RegisterFD(int fd, wxFDIOHandler *handler, int flags = wxFDIO_ALL);
@@ -92,6 +86,7 @@ public:
     virtual void Dispatch(int timeout = TIMEOUT_INFINITE);
 
 protected:
+    // ctor is not public, use Create()
     wxSelectDispatcher();
 
 private: