lily/slash-repeat-engraver.cc

   1 /*
   2   slash-repeat-engraver.cc -- implement Slash_repeat_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2000--2009 Han-Wen Nienhuys <hanwen@xs4all.nl>, Erik Sandberg
   7   <mandolaerik@gmail.com>
   8 */
   9
  10 #include "bar-line.hh"
  11 #include "global-context.hh"
  12 #include "international.hh"
  13 #include "item.hh"
  14 #include "misc.hh"
  15 #include "repeated-music.hh"
  16 #include "score-engraver.hh"
  17 #include "spanner.hh"
  18 #include "stream-event.hh"
  19 #include "warn.hh"
  20
  21 #include "translator.icc"
  22
  23 /**
  24    This acknowledges repeated music with "percent" style.  It typesets
  25    a slash sign.
  26 */
  27 class Slash_repeat_engraver : public Engraver
  28 {
  29 public:
  30   TRANSLATOR_DECLARATIONS (Slash_repeat_engraver);
  31 protected:
  32   Stream_event *slash_;
  33 protected:
  34   DECLARE_TRANSLATOR_LISTENER (percent);
  35   void process_music ();
  36 };
  37
  38 Slash_repeat_engraver::Slash_repeat_engraver ()
  39 {
  40   slash_ = 0;
  41 }
  42
  43 IMPLEMENT_TRANSLATOR_LISTENER (Slash_repeat_engraver, percent);
  44 void
  45 Slash_repeat_engraver::listen_percent (Stream_event *ev)
  46 {
  47   /*todo: separate events for percent and slash */
  48   Moment meas_length
  49     = robust_scm2moment (get_property ("measureLength"), Moment (0));
  50
  51   if (get_event_length (ev) < meas_length)
  52     ASSIGN_EVENT_ONCE (slash_, ev);
  53
  54   /*
  55     don't warn if nothing happens: this can happen if there are whole
  56     measure repeats.
  57    */
  58 }
  59
  60 void
  61 Slash_repeat_engraver::process_music ()
  62 {
  63   if (slash_)
  64     {
  65       make_item ("RepeatSlash", slash_->self_scm ());
  66       slash_ = 0;
  67     }
  68 }
  69
  70 ADD_TRANSLATOR (Slash_repeat_engraver,
  71                 /* doc */
  72                 "Make beat repeats.",
  73
  74                 /* create */
  75                 "RepeatSlash ",
  76
  77                 /* read */
  78                 "measureLength ",
  79
  80                 /* write */
  81                 ""
  82                 );