lily/spanner-break-forbid-engraver.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 2007--2015 Han-Wen Nienhuys <hanwen@lilypond.org>
   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
  20 #include "engraver.hh"
  21 #include "international.hh"
  22 #include "spanner.hh"
  23 #include "stream-event.hh"
  24 #include "warn.hh"
  25 #include "context.hh"
  26
  27 #include "translator.icc"
  28
  29 using std::vector;
  30
  31 class Spanner_break_forbid_engraver : public Engraver
  32 {
  33   TRANSLATOR_DECLARATIONS (Spanner_break_forbid_engraver);
  34   vector<Spanner *> running_spanners_;
  35 protected:
  36   DECLARE_ACKNOWLEDGER (unbreakable_spanner);
  37   DECLARE_END_ACKNOWLEDGER (unbreakable_spanner);
  38
  39   void process_music ();
  40 };
  41
  42 void
  43 Spanner_break_forbid_engraver::process_music ()
  44 {
  45   if (running_spanners_.size ())
  46     {
  47       context ()->get_score_context ()->set_property ("forbidBreak", SCM_BOOL_T);
  48     }
  49 }
  50
  51 void
  52 Spanner_break_forbid_engraver::acknowledge_end_unbreakable_spanner (Grob_info gi)
  53 {
  54   vector<Spanner *>::iterator i = find (running_spanners_.begin (), running_spanners_.end (),
  55                                         gi.spanner ());
  56   if (i != running_spanners_.end ())
  57     running_spanners_.erase (i);
  58 }
  59
  60 void
  61 Spanner_break_forbid_engraver::acknowledge_unbreakable_spanner (Grob_info gi)
  62 {
  63   if (!to_boolean (gi.grob ()->get_property ("breakable")))
  64     running_spanners_.push_back (gi.spanner ());
  65 }
  66
  67 Spanner_break_forbid_engraver::Spanner_break_forbid_engraver ()
  68 {
  69 }
  70
  71 ADD_END_ACKNOWLEDGER (Spanner_break_forbid_engraver, unbreakable_spanner);
  72 ADD_ACKNOWLEDGER (Spanner_break_forbid_engraver, unbreakable_spanner);
  73 ADD_TRANSLATOR (Spanner_break_forbid_engraver,
  74                 /* doc */
  75                 "Forbid breaks in certain spanners.",
  76
  77                 /* create */
  78                 "",
  79
  80                 /* read */
  81                 "",
  82
  83                 /* write */
  84                 ""
  85                );