lily/timing-engraver.cc

   1 /*
   2   timing-grav.cc -- implement Timing_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c)  1997--2001 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8 #include "translator-group.hh"
   9 #include "command-request.hh"
  10 #include "grob-info.hh"
  11 #include "multi-measure-rest.hh"
  12 #include "timing-translator.hh"
  13 #include "engraver.hh"
  14
  15 /**
  16   Do time bookkeeping
  17  */
  18 class Timing_engraver : public Timing_translator, public Engraver
  19 {
  20 protected:
  21   /*
  22     Needed to know whether we're advancing in grace notes, or not.
  23    */
  24   Moment last_moment_;
  25
  26   virtual void start_translation_timestep ();
  27   virtual void stop_translation_timestep ();
  28   virtual void process_music ();
  29
  30 public:
  31   Timing_engraver ();
  32   VIRTUAL_COPY_CONS (Translator);
  33 };
  34
  35
  36 Timing_engraver::Timing_engraver ()
  37 {
  38   last_moment_.main_part_ = Rational (-1);
  39 }
  40
  41 ADD_THIS_TRANSLATOR (Timing_engraver);
  42
  43 void
  44 Timing_engraver::start_translation_timestep ()
  45 {
  46   Timing_translator::start_translation_timestep ();
  47
  48   SCM nonauto = get_property ("barNonAuto");
  49   Moment now = now_mom ();
  50   SCM which = get_property ("whichBar");
  51
  52   /*
  53     Set the first bar of the score?
  54    */
  55   if (!gh_string_p (which))
  56     which
  57       = (now.main_part_ || now.main_part_ == last_moment_.main_part_)
  58       ? SCM_EOL : ly_str02scm ("|");
  59
  60   if (!gh_string_p (which) && !to_boolean (nonauto))
  61     {
  62       SCM always = get_property ("barAlways");
  63       Moment mp = measure_position ();
  64       if ( (last_moment_.main_part_ != now.main_part_
  65             && !mp.main_part_)
  66            || (to_boolean (always)))
  67         {
  68           /* should this work, or be junked?  See input/bugs/no-bars.ly */
  69           which = get_property ("defaultBarType");
  70         }
  71     }
  72
  73   daddy_trans_l_->set_property ("whichBar", which);
  74 }
  75
  76 void
  77 Timing_engraver::stop_translation_timestep ()
  78 {
  79   Timing_translator::stop_translation_timestep ();
  80   daddy_trans_l_->set_property ("whichBar", SCM_EOL);
  81   last_moment_ = now_mom ();
  82 }
  83
  84
  85 /*
  86   ugh. Translator doesn't do process_music ().
  87  */
  88 void
  89 Timing_engraver::process_music ()
  90 {
  91   Timing_translator::process_music ();
  92 }