lily/forbid-break-engraver.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 2002--_2005 Han-Wen Nienhuys <hanwen@xs4all.nl>
   5
   6   LilyPond is free software: you can redistribute it and/or modify
   7   it under the terms of the GNU General Public License as published by
   8   the Free Software Foundation, either version 3 of the License, or
   9   (at your option) any later version.
  10
  11   LilyPond is distributed in the hope that it will be useful,
  12   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14   GNU General Public License for more details.
  15
  16   You should have received a copy of the GNU General Public License
  17   along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19 #include "context.hh"
  20 #include "duration.hh"
  21 #include "engraver.hh"
  22 #include "grob.hh"
  23 #include "input.hh"
  24 #include "pitch.hh"
  25 #include "rhythmic-head.hh"
  26
  27 #include "translator.icc"
  28
  29 class Forbid_line_break_engraver : public Engraver
  30 {
  31 public:
  32   TRANSLATOR_DECLARATIONS (Forbid_line_break_engraver);
  33   void start_translation_timestep ();
  34 };
  35
  36 Forbid_line_break_engraver::Forbid_line_break_engraver ()
  37 {
  38 }
  39
  40 void
  41 Forbid_line_break_engraver::start_translation_timestep ()
  42 {
  43   /*
  44     Check for running note heads. This should probably be done elsewhere.
  45   */
  46   SCM busy = get_property ("busyGrobs");
  47
  48   Moment now = now_mom ();
  49   while (scm_is_pair (busy) && unsmob_moment (scm_caar (busy))->main_part_ == now.main_part_)
  50     busy = scm_cdr (busy);
  51
  52   while (scm_is_pair (busy))
  53     {
  54       Grob *g = unsmob_grob (scm_cdar (busy));
  55       if (g->internal_has_interface (ly_symbol2scm ("rhythmic-grob-interface")))
  56         context ()->get_score_context ()->set_property ("forbidBreak", SCM_BOOL_T);
  57       busy = scm_cdr (busy);
  58     }
  59 }
  60
  61 ADD_TRANSLATOR (Forbid_line_break_engraver,
  62                 /* doc */
  63                 "Forbid line breaks when note heads are still playing at some"
  64                 " point.",
  65
  66                 /* create */
  67                 "",
  68
  69                 /* read */
  70                 "busyGrobs ",
  71
  72                 /* write */
  73                 "forbidBreak "
  74                 );