src/gtk/timer.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        gtk/timer.cpp
   3 // Purpose:     wxTimer implementation
   4 // Author:      Robert Roebling
   5 // Id:          $Id$
   6 // Copyright:   (c) 1998 Robert Roebling
   7 // Licence:     wxWindows licence
   8 /////////////////////////////////////////////////////////////////////////////
   9
  10
  11 #ifdef __GNUG__
  12 #pragma implementation "timer.h"
  13 #endif
  14
  15 #include "wx/defs.h"
  16
  17 #if wxUSE_TIMER
  18
  19 #include "wx/timer.h"
  20
  21 #include "gtk/gtk.h"
  22
  23 // ----------------------------------------------------------------------------
  24 // wxTimer
  25 // ----------------------------------------------------------------------------
  26
  27 IMPLEMENT_ABSTRACT_CLASS(wxTimer, wxObject)
  28
  29 extern "C" gint timeout_callback( gpointer data )
  30 {
  31     wxTimer *timer = (wxTimer*)data;
  32
  33     // Don't change the order of anything in this callback!
  34
  35     if (timer->IsOneShot())
  36     {
  37         // This sets m_tag to -1
  38         timer->Stop();
  39     }
  40
  41     // When getting called from GDK's timer handler we
  42     // are no longer within GDK's grab on the GUI
  43     // thread so we must lock it here ourselves.
  44     gdk_threads_enter();
  45
  46     timer->Notify();
  47
  48     // Release lock again.
  49     gdk_threads_leave();
  50
  51     if (timer->IsOneShot())
  52         return FALSE;
  53
  54     return TRUE;
  55 }
  56
  57 void wxTimer::Init()
  58 {
  59     m_tag = -1;
  60     m_milli = 1000;
  61 }
  62
  63 wxTimer::~wxTimer()
  64 {
  65     wxTimer::Stop();
  66 }
  67
  68 bool wxTimer::Start( int millisecs, bool oneShot )
  69 {
  70     (void)wxTimerBase::Start(millisecs, oneShot);
  71
  72     if (m_tag != -1)
  73         gtk_timeout_remove( m_tag );
  74
  75     m_tag = gtk_timeout_add( m_milli, timeout_callback, this );
  76
  77     return TRUE;
  78 }
  79
  80 void wxTimer::Stop()
  81 {
  82     if (m_tag != -1)
  83     {
  84         gtk_timeout_remove( m_tag );
  85         m_tag = -1;
  86     }
  87 }
  88
  89 #endif // wxUSE_TIMER
  90