include/wx/osx/core/evtloop.h

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        wx/osx/core/evtloop.h
   3 // Purpose:     CoreFoundation-based event loop
   4 // Author:      Vadim Zeitlin
   5 // Modified by:
   6 // Created:     2006-01-12
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) 2006 Vadim Zeitlin <vadim@wxwindows.org>
   9 // Licence:     wxWindows licence
  10 ///////////////////////////////////////////////////////////////////////////////
  11
  12 #ifndef _WX_OSX_CORE_EVTLOOP_H_
  13 #define _WX_OSX_CORE_EVTLOOP_H_
  14
  15 DECLARE_WXOSX_OPAQUE_CFREF( CFRunLoop );
  16 DECLARE_WXOSX_OPAQUE_CFREF( CFRunLoopObserver );
  17
  18 class WXDLLIMPEXP_FWD_BASE wxCFEventLoopPauseIdleEvents;
  19
  20 class WXDLLIMPEXP_BASE wxCFEventLoop : public wxEventLoopBase
  21 {
  22     friend class wxCFEventLoopPauseIdleEvents;
  23 public:
  24     wxCFEventLoop();
  25     virtual ~wxCFEventLoop();
  26
  27     // enters a loop calling OnNextIteration(), Pending() and Dispatch() and
  28     // terminating when Exit() is called
  29     virtual int Run();
  30
  31     // sets the "should exit" flag and wakes up the loop so that it terminates
  32     // soon
  33     virtual void Exit(int rc = 0);
  34
  35     // return true if any events are available
  36     virtual bool Pending() const;
  37
  38     // dispatch a single event, return false if we should exit from the loop
  39     virtual bool Dispatch();
  40
  41     // same as Dispatch() but doesn't wait for longer than the specified (in
  42     // ms) timeout, return true if an event was processed, false if we should
  43     // exit the loop or -1 if timeout expired
  44     virtual int DispatchTimeout(unsigned long timeout);
  45
  46     // implement this to wake up the loop: usually done by posting a dummy event
  47     // to it (can be called from non main thread)
  48     virtual void WakeUp();
  49
  50     virtual bool YieldFor(long eventsToProcess);
  51
  52 #if wxUSE_EVENTLOOP_SOURCE
  53     virtual wxEventLoopSource *
  54       AddSourceForFD(int fd, wxEventLoopSourceHandler *handler, int flags);
  55 #endif // wxUSE_EVENTLOOP_SOURCE
  56
  57     bool ShouldProcessIdleEvents() const { return m_processIdleEvents ; }
  58 protected:
  59     void CommonModeObserverCallBack(CFRunLoopObserverRef observer, int activity);
  60     void DefaultModeObserverCallBack(CFRunLoopObserverRef observer, int activity);
  61
  62     // set to false to avoid idling at unexpected moments - eg when having native message boxes
  63     void SetProcessIdleEvents(bool process) { m_processIdleEvents = process; }
  64
  65     static void OSXCommonModeObserverCallBack(CFRunLoopObserverRef observer, int activity, void *info);
  66     static void OSXDefaultModeObserverCallBack(CFRunLoopObserverRef observer, int activity, void *info);
  67
  68     // get the currently executing CFRunLoop
  69     virtual CFRunLoopRef CFGetCurrentRunLoop() const;
  70
  71     virtual int DoDispatchTimeout(unsigned long timeout);
  72
  73     virtual void DoRun();
  74
  75     virtual void DoStop();
  76
  77     // should we exit the loop?
  78     bool m_shouldExit;
  79
  80     // the loop exit code
  81     int m_exitcode;
  82
  83     // cfrunloop
  84     CFRunLoopRef m_runLoop;
  85
  86     // common modes runloop observer
  87     CFRunLoopObserverRef m_commonModeRunLoopObserver;
  88
  89     // default mode runloop observer
  90     CFRunLoopObserverRef m_defaultModeRunLoopObserver;
  91
  92     // set to false to avoid idling at unexpected moments - eg when having native message boxes
  93     bool m_processIdleEvents;
  94
  95 private:
  96     // process all already pending events and dispatch a new one (blocking
  97     // until it appears in the event queue if necessary)
  98     //
  99     // returns the return value of DoDispatchTimeout()
 100     int DoProcessEvents();
 101
 102     wxDECLARE_NO_COPY_CLASS(wxCFEventLoop);
 103 };
 104
 105 class WXDLLIMPEXP_BASE wxCFEventLoopPauseIdleEvents : public wxObject
 106 {
 107 public:
 108     wxCFEventLoopPauseIdleEvents();
 109     virtual ~wxCFEventLoopPauseIdleEvents();
 110 private:
 111     bool m_formerState;
 112 };
 113
 114 #endif // _WX_OSX_EVTLOOP_H_