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" {
  31 static gint timeout_callback( gpointer data )
  32 {
  33     wxTimer *timer = (wxTimer*)data;
  34
  35     // Don't change the order of anything in this callback!
  36
  37     if (timer->IsOneShot())
  38     {
  39         // This sets m_tag to -1
  40         timer->Stop();
  41     }
  42
  43     // When getting called from GDK's timer handler we
  44     // are no longer within GDK's grab on the GUI
  45     // thread so we must lock it here ourselves.
  46     gdk_threads_enter();
  47
  48     timer->Notify();
  49
  50     // Release lock again.
  51     gdk_threads_leave();
  52
  53     if (timer->IsOneShot())
  54         return FALSE;
  55
  56     return TRUE;
  57 }
  58 }
  59
  60 void wxTimer::Init()
  61 {
  62     m_tag = -1;
  63     m_milli = 1000;
  64 }
  65
  66 wxTimer::~wxTimer()
  67 {
  68     wxTimer::Stop();
  69 }
  70
  71 bool wxTimer::Start( int millisecs, bool oneShot )
  72 {
  73     (void)wxTimerBase::Start(millisecs, oneShot);
  74
  75     if (m_tag != -1)
  76         gtk_timeout_remove( m_tag );
  77
  78     m_tag = gtk_timeout_add( m_milli, timeout_callback, this );
  79
  80     return TRUE;
  81 }
  82
  83 void wxTimer::Stop()
  84 {
  85     if (m_tag != -1)
  86     {
  87         gtk_timeout_remove( m_tag );
  88         m_tag = -1;
  89     }
  90 }
  91
  92 #endif // wxUSE_TIMER
  93