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 gint 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     if (timer->IsOneShot())
  49         return FALSE;
  50
  51     return TRUE;
  52 }
  53 }
  54
  55 void wxTimer::Init()
  56 {
  57     m_tag = -1;
  58     m_milli = 1000;
  59 }
  60
  61 wxTimer::~wxTimer()
  62 {
  63     wxTimer::Stop();
  64 }
  65
  66 bool wxTimer::Start( int millisecs, bool oneShot )
  67 {
  68     (void)wxTimerBase::Start(millisecs, oneShot);
  69
  70     if (m_tag != -1)
  71         g_source_remove( m_tag );
  72
  73     m_tag = g_timeout_add( m_milli, timeout_callback, this );
  74
  75     return TRUE;
  76 }
  77
  78 void wxTimer::Stop()
  79 {
  80     if (m_tag != -1)
  81     {
  82         g_source_remove( m_tag );
  83         m_tag = -1;
  84     }
  85 }
  86
  87 #endif // wxUSE_TIMER
  88