src/osx/carbon/evtloop.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/osx/carbon/evtloop.cpp
   3 // Purpose:     implementation of wxEventLoop for wxMac
   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 // ============================================================================
  13 // declarations
  14 // ============================================================================
  15
  16 // ----------------------------------------------------------------------------
  17 // headers
  18 // ----------------------------------------------------------------------------
  19
  20 // for compilers that support precompilation, includes "wx.h".
  21 #include "wx/wxprec.h"
  22
  23 #ifdef __BORLANDC__
  24     #pragma hdrstop
  25 #endif
  26
  27 #include "wx/evtloop.h"
  28
  29 #ifndef WX_PRECOMP
  30     #include "wx/app.h"
  31     #include "wx/log.h"
  32 #endif // WX_PRECOMP
  33
  34 #include "wx/osx/private.h"
  35
  36 // ============================================================================
  37 // wxEventLoop implementation
  38 // ============================================================================
  39
  40 wxGUIEventLoop::wxGUIEventLoop()
  41 {
  42     m_sleepTime = kEventDurationNoWait;
  43 }
  44
  45 void wxGUIEventLoop::WakeUp()
  46 {
  47     extern void wxMacWakeUp();
  48
  49     wxMacWakeUp();
  50 }
  51
  52 void wxGUIEventLoop::DispatchAndReleaseEvent(EventRef theEvent)
  53 {
  54     if ( wxTheApp )
  55         wxTheApp->MacSetCurrentEvent( theEvent, NULL );
  56
  57     OSStatus status = SendEventToEventTarget(theEvent, GetEventDispatcherTarget());
  58     if (status == eventNotHandledErr && wxTheApp)
  59         wxTheApp->MacHandleUnhandledEvent(theEvent);
  60
  61     ReleaseEvent( theEvent );
  62 }
  63
  64 bool wxGUIEventLoop::Pending() const
  65 {
  66     EventRef theEvent;
  67
  68     return ReceiveNextEvent
  69            (
  70             0,          // we want any event at all so we don't specify neither
  71             NULL,       // the number of event types nor the types themselves
  72             kEventDurationNoWait,
  73             false,      // don't remove the event from queue
  74             &theEvent
  75            ) == noErr;
  76 }
  77
  78 bool wxGUIEventLoop::Dispatch()
  79 {
  80     if ( !wxTheApp )
  81         return false;
  82
  83     wxMacAutoreleasePool autoreleasepool;
  84
  85     EventRef theEvent;
  86
  87     OSStatus status = ReceiveNextEvent(0, NULL, m_sleepTime, true, &theEvent) ;
  88
  89     switch (status)
  90     {
  91         case eventLoopTimedOutErr :
  92             // process pending wx events before sending idle events
  93             wxTheApp->ProcessPendingEvents();
  94             if ( wxTheApp->ProcessIdle() )
  95                 m_sleepTime = kEventDurationNoWait ;
  96             else
  97             {
  98                 m_sleepTime = kEventDurationSecond;
  99 #if wxUSE_THREADS
 100                 wxMutexGuiLeave();
 101                 wxMilliSleep(20);
 102                 wxMutexGuiEnter();
 103 #endif
 104             }
 105             break;
 106
 107         case eventLoopQuitErr :
 108             // according to QA1061 this may also occur
 109             // when a WakeUp Process is executed
 110             break;
 111
 112         default:
 113             DispatchAndReleaseEvent(theEvent);
 114             m_sleepTime = kEventDurationNoWait ;
 115             break;
 116     }
 117
 118     return true;
 119 }
 120
 121 int wxGUIEventLoop::DispatchTimeout(unsigned long timeout)
 122 {
 123     EventRef event;
 124     OSStatus status = ReceiveNextEvent(0, NULL, timeout/1000, true, &event);
 125     switch ( status )
 126     {
 127         default:
 128             wxFAIL_MSG( "unexpected ReceiveNextEvent() error" );
 129             // fall through
 130
 131         case eventLoopTimedOutErr:
 132             return -1;
 133
 134         case eventLoopQuitErr:
 135             return 0;
 136
 137         case noErr:
 138             DispatchAndReleaseEvent(event);
 139             return 1;
 140     }
 141 }
 142
 143 bool wxGUIEventLoop::YieldFor(long eventsToProcess)
 144 {
 145 #if wxUSE_THREADS
 146     // Yielding from a non-gui thread needs to bail out, otherwise we end up
 147     // possibly sending events in the thread too.
 148     if ( !wxThread::IsMain() )
 149     {
 150         return true;
 151     }
 152 #endif // wxUSE_THREADS
 153
 154     m_isInsideYield = true;
 155     m_eventsToProcessInsideYield = eventsToProcess;
 156
 157 #if wxUSE_LOG
 158     // disable log flushing from here because a call to wxYield() shouldn't
 159     // normally result in message boxes popping up &c
 160     wxLog::Suspend();
 161 #endif // wxUSE_LOG
 162
 163     // process all pending events:
 164     while ( Pending() )
 165         Dispatch();
 166
 167     // it's necessary to call ProcessIdle() to update the frames sizes which
 168     // might have been changed (it also will update other things set from
 169     // OnUpdateUI() which is a nice (and desired) side effect)
 170     while ( ProcessIdle() ) {}
 171
 172     // if there are pending events, we must process them.
 173     if (wxTheApp)
 174         wxTheApp->ProcessPendingEvents();
 175
 176 #if wxUSE_LOG
 177     wxLog::Resume();
 178 #endif // wxUSE_LOG
 179     m_isInsideYield = false;
 180
 181     return true;
 182 }