streamlining OSX event support first step, see #11805, see #11797

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@63687 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/osx/evtloop.h

@@ -15,9 +15,37 @@
 
 typedef struct __CFRunLoop * CFRunLoopRef;
 
-class WXDLLIMPEXP_BASE wxCFEventLoop : public wxEventLoopManual
+class WXDLLIMPEXP_BASE wxCFEventLoop : public wxEventLoopBase
 {
 public:
+    wxCFEventLoop();
+    virtual ~wxCFEventLoop();
+
+    // enters a loop calling OnNextIteration(), Pending() and Dispatch() and
+    // terminating when Exit() is called
+    virtual int Run();
+    
+    // sets the "should exit" flag and wakes up the loop so that it terminates
+    // soon
+    virtual void Exit(int rc = 0);
+
+    // return true if any events are available
+    virtual bool Pending() const;
+    
+    // dispatch a single event, return false if we should exit from the loop
+    virtual bool Dispatch();
+    
+    // same as Dispatch() but doesn't wait for longer than the specified (in
+    // ms) timeout, return true if an event was processed, false if we should
+    // exit the loop or -1 if timeout expired
+    virtual int DispatchTimeout(unsigned long timeout);
+
+    // implement this to wake up the loop: usually done by posting a dummy event
+    // to it (can be called from non main thread)
+    virtual void WakeUp();
+    
+    virtual bool YieldFor(long eventsToProcess);
+
 #if wxUSE_EVENTLOOP_SOURCE
     virtual wxEventLoopSource *
       AddSourceForFD(int fd, wxEventLoopSourceHandler *handler, int flags);
@@ -25,7 +53,24 @@ public:
 
 protected:
     // get the currently executing CFRunLoop
-    virtual CFRunLoopRef CFGetCurrentRunLoop() const = 0;
+    virtual CFRunLoopRef CFGetCurrentRunLoop() const;
+
+    virtual int DoDispatchTimeout(unsigned long timeout);
+
+    double m_sleepTime;
+
+    // should we exit the loop?
+    bool m_shouldExit;
+
+    // the loop exit code
+    int m_exitcode;
+
+private:
+    // process all already pending events and dispatch a new one (blocking
+    // until it appears in the event queue if necessary)
+    //
+    // returns the return value of DoDispatchTimeout()
+    int DoProcessEvents();
 };
 
 #if wxUSE_GUI