lily/ottava-engraver.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 2000--2010 Han-Wen Nienhuys
   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 "item.hh"
  22 #include "note-column.hh"
  23 #include "protected-scm.hh"
  24 #include "side-position-interface.hh"
  25 #include "spanner.hh"
  26 #include "text-interface.hh"
  27
  28
  29 class Ottava_spanner_engraver : public Engraver
  30 {
  31 public:
  32   TRANSLATOR_DECLARATIONS (Ottava_spanner_engraver);
  33 protected:
  34   virtual void finalize ();
  35
  36   DECLARE_ACKNOWLEDGER (note_column);
  37
  38   void process_music ();
  39   void stop_translation_timestep ();
  40   virtual void derived_mark () const;
  41 private:
  42   Spanner *span_;
  43   Spanner *finished_;
  44
  45   SCM last_ottavation_;
  46
  47   void typeset_all ();
  48 };
  49
  50 void
  51 Ottava_spanner_engraver::derived_mark () const
  52 {
  53   scm_gc_mark (last_ottavation_);
  54 }
  55
  56 Ottava_spanner_engraver::Ottava_spanner_engraver ()
  57 {
  58   finished_ = 0;
  59   span_ = 0;
  60   last_ottavation_ = SCM_EOL;
  61 }
  62
  63 void
  64 Ottava_spanner_engraver::process_music ()
  65 {
  66   SCM ott = get_property ("ottavation");
  67   if (ott != last_ottavation_)
  68     {
  69       finished_ = span_;
  70       span_ = 0;
  71       if (Text_interface::is_markup (ott))
  72         {
  73           span_ = make_spanner ("OttavaBracket", SCM_EOL);
  74           span_->set_property ("text", ott);
  75
  76           SCM offset (get_property ("middleCOffset"));
  77           if (robust_scm2double (offset, 0) > 0)
  78             span_->set_property ("direction", scm_from_int (DOWN));
  79         }
  80     }
  81   last_ottavation_ = ott;
  82 }
  83
  84 void
  85 Ottava_spanner_engraver::acknowledge_note_column (Grob_info info)
  86 {
  87   Item *it = info.item ();
  88   if (span_ && it)
  89     {
  90       Side_position_interface::add_support (span_, it);
  91
  92       if (!span_->get_bound (LEFT))
  93         span_->set_bound (LEFT, it);
  94       span_->set_bound (RIGHT, it);
  95     }
  96 }
  97
  98 void
  99 Ottava_spanner_engraver::typeset_all ()
 100 {
 101   if (finished_)
 102     {
 103       Direction d = LEFT;
 104       do
 105         {
 106           if (!finished_->get_bound (RIGHT))
 107             {
 108               Grob *e = unsmob_grob (get_property ("currentMusicalColumn"));
 109               finished_->set_bound (d, e);
 110             }
 111         }
 112       while (flip (&d) != LEFT);
 113
 114       finished_ = 0;
 115     }
 116 }
 117
 118 void
 119 Ottava_spanner_engraver::stop_translation_timestep ()
 120 {
 121   if (span_ && !span_->get_bound (LEFT))
 122     {
 123       Grob *e = unsmob_grob (get_property ("currentMusicalColumn"));
 124       span_->set_bound (LEFT, e);
 125     }
 126
 127   typeset_all ();
 128 }
 129
 130 void
 131 Ottava_spanner_engraver::finalize ()
 132 {
 133   typeset_all ();
 134   if (span_)
 135     finished_ = span_;
 136   typeset_all ();
 137   last_ottavation_ = SCM_EOL;
 138 }
 139
 140 #include "translator.icc"
 141
 142 ADD_ACKNOWLEDGER (Ottava_spanner_engraver, note_column);
 143
 144 ADD_TRANSLATOR (Ottava_spanner_engraver,
 145                 /* doc */
 146                 "Create a text spanner when the ottavation property changes.",
 147
 148                 /* create */
 149                 "OttavaBracket ",
 150
 151                 /* read */
 152                 "middleCOffset "
 153                 "ottavation "
 154                 "currentMusicalColumn ",
 155
 156                 /* write */
 157                 ""
 158                 );