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 ENTER_DESCRIPTION(Forbid_line_break_engraver,
  16 /* descr */       "Forbid line breaks when note heads are still playing at some point.",
  17 /* creats*/       "",
  18 /* accepts */     "",
  19 /* acks  */      "",
  20 /* reads */       "busyGrobs",
  21 /* write */       "");
  22
  23 void
  24 Forbid_line_break_engraver::start_translation_timestep()
  25 {
  26   /*
  27     Check for running note heads. This should probably be done elsewhere.
  28    */
  29   SCM busy = get_property ("busyGrobs");
  30
  31   Moment now = now_mom();
  32   while (gh_pair_p (busy) && unsmob_moment (gh_caar (busy))->main_part_ == now.main_part_)
  33     busy = gh_cdr (busy);
  34
  35
  36   while (gh_pair_p (busy))
  37     {
  38       Grob *g = unsmob_grob (gh_cdar (busy));
  39       if (Rhythmic_head::has_interface (g))
  40         {
  41           top_engraver()->forbid_breaks();
  42         }
  43       busy = gh_cdr(busy);
  44     }
  45 }