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 // For compilers that support precompilation, includes "wx.h".
  11 #include "wx/wxprec.h"
  12
  13 #if wxUSE_TIMER
  14
  15 #include "wx/timer.h"
  16
  17 #include <gtk/gtk.h>
  18
  19 // ----------------------------------------------------------------------------
  20 // wxTimer
  21 // ----------------------------------------------------------------------------
  22
  23 IMPLEMENT_ABSTRACT_CLASS(wxTimer, wxEvtHandler)
  24
  25 extern "C" {
  26 static gboolean timeout_callback(gpointer data)
  27 {
  28     wxTimer *timer = (wxTimer*)data;
  29
  30     // Don't change the order of anything in this callback!
  31
  32     if (timer->IsOneShot())
  33     {
  34         // This sets m_tag to -1
  35         timer->Stop();
  36     }
  37
  38     // When getting called from GDK's timer handler we
  39     // are no longer within GDK's grab on the GUI
  40     // thread so we must lock it here ourselves.
  41     gdk_threads_enter();
  42
  43     timer->Notify();
  44
  45     // Release lock again.
  46     gdk_threads_leave();
  47
  48     return !timer->IsOneShot();
  49 }
  50 }
  51
  52 void wxTimer::Init()
  53 {
  54     m_sourceId = 0;
  55     m_milli = 1000;
  56 }
  57
  58 wxTimer::~wxTimer()
  59 {
  60     Stop();
  61 }
  62
  63 bool wxTimer::Start( int millisecs, bool oneShot )
  64 {
  65     (void)wxTimerBase::Start(millisecs, oneShot);
  66
  67     if (m_sourceId != 0)
  68         g_source_remove(m_sourceId);
  69
  70     m_sourceId = g_timeout_add(m_milli, timeout_callback, this);
  71
  72     return true;
  73 }
  74
  75 void wxTimer::Stop()
  76 {
  77     if (m_sourceId != 0)
  78     {
  79         g_source_remove(m_sourceId);
  80         m_sourceId = 0;
  81     }
  82 }
  83
  84 #endif // wxUSE_TIMER
  85