lily/spanner-break-forbid-engraver.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 2007--2011 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
  21
  22 #include "engraver.hh"
  23 #include "international.hh"
  24 #include "spanner.hh"
  25 #include "stream-event.hh"
  26 #include "warn.hh"
  27 #include "context.hh"
  28
  29 #include "translator.icc"
  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
  43 void
  44 Spanner_break_forbid_engraver::process_music ()
  45 {
  46   if (running_spanners_.size ())
  47     {
  48       context ()->get_score_context ()->set_property ("forbidBreak", SCM_BOOL_T);
  49     }
  50 }
  51
  52 void
  53 Spanner_break_forbid_engraver::acknowledge_end_unbreakable_spanner (Grob_info gi)
  54 {
  55   vector<Spanner*>::iterator i = find (running_spanners_.begin (), running_spanners_.end (),
  56                                        gi.spanner ());
  57   if (i != running_spanners_.end ())
  58     running_spanners_.erase (i);
  59 }
  60
  61 void
  62 Spanner_break_forbid_engraver::acknowledge_unbreakable_spanner (Grob_info gi)
  63 {
  64   if (!to_boolean (gi.grob ()->get_property ("breakable")))
  65     running_spanners_.push_back (gi.spanner ());
  66 }
  67
  68 Spanner_break_forbid_engraver::Spanner_break_forbid_engraver ()
  69 {
  70 }
  71
  72
  73 ADD_END_ACKNOWLEDGER (Spanner_break_forbid_engraver, unbreakable_spanner);
  74 ADD_ACKNOWLEDGER (Spanner_break_forbid_engraver, unbreakable_spanner);
  75 ADD_TRANSLATOR (Spanner_break_forbid_engraver,
  76                 /* doc */
  77                 "Forbid breaks in certain spanners.",
  78
  79                 /* create */
  80                 "",
  81
  82                 /* read */
  83                 "",
  84
  85                 /* write */
  86                 ""
  87                 );