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--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8 #include <iostream.h>
   9
  10 #include "translator-group.hh"
  11 #include "command-request.hh"
  12 #include "grob-info.hh"
  13 #include "multi-measure-rest.hh"
  14 #include "timing-translator.hh"
  15 #include "engraver.hh"
  16
  17 /**
  18   Do time bookkeeping
  19  */
  20 class Timing_engraver : public Timing_translator, public Engraver
  21 {
  22 protected:
  23   virtual void start_translation_timestep ();
  24   virtual void stop_translation_timestep ();
  25   virtual void process_music ();
  26 public:
  27   VIRTUAL_COPY_CONS(Translator);
  28 };
  29
  30 ADD_THIS_TRANSLATOR(Timing_engraver);
  31
  32 void
  33 Timing_engraver::start_translation_timestep( )
  34 {
  35   Timing_translator::start_translation_timestep ();
  36
  37   SCM nonauto = get_property ("barNonAuto");
  38
  39   SCM which = get_property ("whichBar");
  40   if (!gh_string_p (which))
  41     which = now_mom ()
  42       ? SCM_EOL : ly_str02scm ("|");
  43
  44   if (!gh_string_p (which) && !to_boolean (nonauto))
  45     {
  46       SCM always = get_property ("barAlways");
  47       if (!measure_position ()
  48           || (to_boolean (always)))
  49         {
  50           which=get_property ("defaultBarType" );
  51         }
  52     }
  53
  54   daddy_trans_l_->set_property ("whichBar", which);
  55 }
  56
  57 void
  58 Timing_engraver::stop_translation_timestep ()
  59 {
  60   Timing_translator::stop_translation_timestep ();
  61   daddy_trans_l_->set_property ("whichBar", SCM_EOL);
  62 }
  63
  64
  65 /*
  66   ugh. Translator doesn't do process_music ().
  67  */
  68 void
  69 Timing_engraver::process_music ()
  70 {
  71   Timing_translator::process_music ();
  72 }