TAO/tests/Xt_Stopwatch/timer.cpp

   1 #include "timer.h"
   2
   3
   4 Timer_imp::Timer_imp (XtAppContext &app,
   5                       CORBA::Long interval,
   6                       Stopwatch_display *stopwatch)
   7   :stopwatch_ (stopwatch),
   8    counter_ (0),
   9    interval_ (interval),
  10    id_ (0),
  11    app_ (app)
  12 {
  13 }
  14
  15 Timer_imp::~Timer_imp ()
  16 {
  17 }
  18
  19 void
  20 Timer_imp::start (void)
  21 {
  22   // Reset the elapsed time
  23   this->counter_ = 0;
  24
  25   // If a previous callback is still in effect, remove it
  26   if (this->id_)
  27     {
  28       XtRemoveTimeOut (this->id_);
  29       this->id_ = 0;
  30     }
  31
  32   // Register a function to be called in interval_ milliseconds
  33   this->id_ = XtAppAddTimeOut (this->app_,
  34                                this->interval_,
  35                                &Timer_imp::tick_callback,
  36                                (XtPointer) this );
  37 }
  38
  39 void
  40 Timer_imp::stop (void)
  41 {
  42     // Remove the current timeout function, if any
  43   if (this->id_)
  44     XtRemoveTimeOut (this->id_);
  45
  46     this->id_ = 0;
  47 }
  48
  49 CORBA::Float
  50 Timer_imp::elapsed_time(void)
  51 {
  52     return ((CORBA::Float) counter_ * interval_ / 1000.0 );
  53 }
  54
  55 void
  56 Timer_imp::tick_callback (XtPointer client_data,
  57                           XtIntervalId * )
  58 {
  59   // Get the object pointer and call the corresponding tick function
  60   Timer_imp *obj = static_cast<Timer_imp *> (client_data);
  61   obj->tick ();
  62 }
  63
  64
  65 void
  66 Timer_imp::tick (void)
  67 {
  68   // Increment a counter for each tick
  69   counter_++;
  70
  71   // Call derived class function to report time
  72   this->report_time (this->elapsed_time ());
  73
  74   // Reinstall the timeout callback
  75   this->id_ = XtAppAddTimeOut (app_,
  76                                interval_,
  77                                &Timer_imp::tick_callback,
  78                                (XtPointer) this);
  79 }
  80
  81 void
  82 Timer_imp::report_time (CORBA::Float time)
  83 {
  84   stopwatch_->set_time (time);
  85 }
  86
  87