TAO/tests/Xt_Stopwatch/timer.cpp

   1 #include "timer.h"
   2
   3 Timer_imp::Timer_imp (XtAppContext &app,
   4                       CORBA::Long interval,
   5                       Stopwatch_display *stopwatch)
   6   :stopwatch_ (stopwatch),
   7    counter_ (0),
   8    interval_ (interval),
   9    id_ (0),
  10    app_ (app)
  11 {
  12 }
  13
  14 Timer_imp::~Timer_imp ()
  15 {
  16 }
  17
  18 void
  19 Timer_imp::start ()
  20 {
  21   // Reset the elapsed time
  22   this->counter_ = 0;
  23
  24   // If a previous callback is still in effect, remove it
  25   if (this->id_)
  26     {
  27       XtRemoveTimeOut (this->id_);
  28       this->id_ = 0;
  29     }
  30
  31   // Register a function to be called in interval_ milliseconds
  32   this->id_ = XtAppAddTimeOut (this->app_,
  33                                this->interval_,
  34                                &Timer_imp::tick_callback,
  35                                (XtPointer) this);
  36 }
  37
  38 void
  39 Timer_imp::stop ()
  40 {
  41     // Remove the current timeout function, if any
  42   if (this->id_)
  43     XtRemoveTimeOut (this->id_);
  44
  45     this->id_ = 0;
  46 }
  47
  48 CORBA::Float
  49 Timer_imp::elapsed_time()
  50 {
  51     return ((CORBA::Float) counter_ * interval_ / 1000.0);
  52 }
  53
  54 void
  55 Timer_imp::tick_callback (XtPointer client_data,
  56                           XtIntervalId * )
  57 {
  58   // Get the object pointer and call the corresponding tick function
  59   Timer_imp *obj = static_cast<Timer_imp *> (client_data);
  60   obj->tick ();
  61 }
  62
  63 void
  64 Timer_imp::tick ()
  65 {
  66   // Increment a counter for each tick
  67   counter_++;
  68
  69   // Call derived class function to report time
  70   this->report_time (this->elapsed_time ());
  71
  72   // Reinstall the timeout callback
  73   this->id_ = XtAppAddTimeOut (app_,
  74                                interval_,
  75                                &Timer_imp::tick_callback,
  76                                (XtPointer) this);
  77 }
  78
  79 void
  80 Timer_imp::report_time (CORBA::Float time)
  81 {
  82   stopwatch_->set_time (time);
  83 }