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 #if defined(__GNUG__) && !defined(NO_GCC_PRAGMA)
  12 #pragma implementation "timer.h"
  13 #endif
  14
  15 // For compilers that support precompilation, includes "wx.h".
  16 #include "wx/wxprec.h"
  17
  18 #if wxUSE_TIMER
  19
  20 #include "wx/timer.h"
  21
  22 #include "gtk/gtk.h"
  23
  24 // ----------------------------------------------------------------------------
  25 // wxTimer
  26 // ----------------------------------------------------------------------------
  27
  28 IMPLEMENT_ABSTRACT_CLASS(wxTimer, wxEvtHandler)
  29
  30 extern "C" gint timeout_callback( gpointer data )
  31 {
  32     wxTimer *timer = (wxTimer*)data;
  33
  34     // Don't change the order of anything in this callback!
  35
  36     if (timer->IsOneShot())
  37     {
  38         // This sets m_tag to -1
  39         timer->Stop();
  40     }
  41
  42     // When getting called from GDK's timer handler we
  43     // are no longer within GDK's grab on the GUI
  44     // thread so we must lock it here ourselves.
  45     gdk_threads_enter();
  46
  47     timer->Notify();
  48
  49     // Release lock again.
  50     gdk_threads_leave();
  51
  52     if (timer->IsOneShot())
  53         return FALSE;
  54
  55     return TRUE;
  56 }
  57
  58 void wxTimer::Init()
  59 {
  60     m_tag = -1;
  61     m_milli = 1000;
  62 }
  63
  64 wxTimer::~wxTimer()
  65 {
  66     wxTimer::Stop();
  67 }
  68
  69 bool wxTimer::Start( int millisecs, bool oneShot )
  70 {
  71     (void)wxTimerBase::Start(millisecs, oneShot);
  72
  73     if (m_tag != -1)
  74         gtk_timeout_remove( m_tag );
  75
  76     m_tag = gtk_timeout_add( m_milli, timeout_callback, this );
  77
  78     return TRUE;
  79 }
  80
  81 void wxTimer::Stop()
  82 {
  83     if (m_tag != -1)
  84     {
  85         gtk_timeout_remove( m_tag );
  86         m_tag = -1;
  87     }
  88 }
  89
  90 #endif // wxUSE_TIMER
  91