lily/forbid-break-engraver.cc

   1 #include "rhythmic-head.hh"
   2 #include "engraver.hh"
   3 #include "grob.hh"
   4 #include "score-engraver.hh"
   5
   6 class Forbid_line_break_engraver : public Engraver
   7 {
   8 public:
   9   TRANSLATOR_DECLARATIONS (Forbid_line_break_engraver);
  10   virtual void start_translation_timestep ();
  11 };
  12
  13 Forbid_line_break_engraver::Forbid_line_break_engraver (){}
  14
  15 void
  16 Forbid_line_break_engraver::start_translation_timestep ()
  17 {
  18   /*
  19     Check for running note heads. This should probably be done elsewhere.
  20    */
  21   SCM busy = get_property ("busyGrobs");
  22
  23   Moment now = now_mom ();
  24   while (ly_pair_p (busy) && unsmob_moment (ly_caar (busy))->main_part_ == now.main_part_)
  25     busy = ly_cdr (busy);
  26
  27
  28   while (ly_pair_p (busy))
  29     {
  30       Grob *g = unsmob_grob (ly_cdar (busy));
  31       if (Rhythmic_head::has_interface (g))
  32         {
  33           get_score_engraver ()->forbid_breaks ();
  34         }
  35       busy = ly_cdr (busy);
  36     }
  37 }
  38
  39
  40 ENTER_DESCRIPTION (Forbid_line_break_engraver,
  41 /* descr */       "Forbid line breaks when note heads are still playing at some point.",
  42 /* creats*/       "",
  43 /* accepts */     "",
  44 /* acks  */      "",
  45 /* reads */       "busyGrobs",
  46 /* write */       "");