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 class Spanner_break_forbid_engraver : public Engraver
  30 {
  31   TRANSLATOR_DECLARATIONS (Spanner_break_forbid_engraver);
  32   vector<Spanner *> running_spanners_;
  33 protected:
  34   void acknowledge_unbreakable_spanner (Grob_info);
  35   void acknowledge_end_unbreakable_spanner (Grob_info);
  36
  37   void process_music ();
  38 };
  39
  40 void
  41 Spanner_break_forbid_engraver::process_music ()
  42 {
  43   if (running_spanners_.size ())
  44     {
  45       context ()->get_score_context ()->set_property ("forbidBreak", SCM_BOOL_T);
  46     }
  47 }
  48
  49 void
  50 Spanner_break_forbid_engraver::acknowledge_end_unbreakable_spanner (Grob_info gi)
  51 {
  52   vector<Spanner *>::iterator i = find (running_spanners_.begin (), running_spanners_.end (),
  53                                         gi.spanner ());
  54   if (i != running_spanners_.end ())
  55     running_spanners_.erase (i);
  56 }
  57
  58 void
  59 Spanner_break_forbid_engraver::acknowledge_unbreakable_spanner (Grob_info gi)
  60 {
  61   if (!to_boolean (gi.grob ()->get_property ("breakable")))
  62     running_spanners_.push_back (gi.spanner ());
  63 }
  64
  65 Spanner_break_forbid_engraver::Spanner_break_forbid_engraver (Context *c)
  66   : Engraver (c)
  67 {
  68 }
  69
  70 void
  71 Spanner_break_forbid_engraver::boot ()
  72 {
  73   ADD_END_ACKNOWLEDGER (Spanner_break_forbid_engraver, unbreakable_spanner);
  74   ADD_ACKNOWLEDGER (Spanner_break_forbid_engraver, unbreakable_spanner);
  75 }
  76
  77 ADD_TRANSLATOR (Spanner_break_forbid_engraver,
  78                 /* doc */
  79                 "Forbid breaks in certain spanners.",
  80
  81                 /* create */
  82                 "",
  83
  84                 /* read */
  85                 "",
  86
  87                 /* write */
  88                 ""
  89                );