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 "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   virtual void start_translation_timestep ();
  22   virtual void stop_translation_timestep ();
  23   virtual void process_music ();
  24 public:
  25   VIRTUAL_COPY_CONS(Translator);
  26 };
  27
  28 ADD_THIS_TRANSLATOR(Timing_engraver);
  29
  30 void
  31 Timing_engraver::start_translation_timestep( )
  32 {
  33   Timing_translator::start_translation_timestep ();
  34
  35   SCM nonauto = get_property ("barNonAuto");
  36
  37   SCM which = get_property ("whichBar");
  38   if (!gh_string_p (which))
  39     which = now_mom ()
  40       ? SCM_EOL : ly_str02scm ("|");
  41
  42   if (!gh_string_p (which) && !to_boolean (nonauto))
  43     {
  44       SCM always = get_property ("barAlways");
  45       if (!measure_position ()
  46           || (to_boolean (always)))
  47         {
  48           /* should this work, or be junked?  See input/bugs/no-bars.ly */
  49           which=get_property ("defaultBarType" );
  50         }
  51     }
  52
  53   daddy_trans_l_->set_property ("whichBar", which);
  54 }
  55
  56 void
  57 Timing_engraver::stop_translation_timestep ()
  58 {
  59   Timing_translator::stop_translation_timestep ();
  60   daddy_trans_l_->set_property ("whichBar", SCM_EOL);
  61 }
  62
  63
  64 /*
  65   ugh. Translator doesn't do process_music ().
  66  */
  67 void
  68 Timing_engraver::process_music ()
  69 {
  70   Timing_translator::process_music ();
  71 }