lily/ottava-engraver.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 2000--2009 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 "protected-scm.hh"
  21 #include "note-column.hh"
  22 #include "side-position-interface.hh"
  23 #include "engraver.hh"
  24 #include "spanner.hh"
  25 #include "text-interface.hh"
  26 #include "item.hh"
  27
  28 class Ottava_spanner_engraver : public Engraver
  29 {
  30 public:
  31   TRANSLATOR_DECLARATIONS (Ottava_spanner_engraver);
  32 protected:
  33   virtual void finalize ();
  34
  35   DECLARE_ACKNOWLEDGER (note_column);
  36
  37   void process_music ();
  38   void stop_translation_timestep ();
  39   virtual void derived_mark () const;
  40 private:
  41   Spanner *span_;
  42   Spanner *finished_;
  43
  44   SCM last_ottavation_;
  45
  46   void typeset_all ();
  47 };
  48
  49 void
  50 Ottava_spanner_engraver::derived_mark () const
  51 {
  52   scm_gc_mark (last_ottavation_);
  53 }
  54
  55 Ottava_spanner_engraver::Ottava_spanner_engraver ()
  56 {
  57   finished_ = 0;
  58   span_ = 0;
  59   last_ottavation_ = SCM_EOL;
  60 }
  61
  62 void
  63 Ottava_spanner_engraver::process_music ()
  64 {
  65   SCM ott = get_property ("ottavation");
  66   if (ott != last_ottavation_)
  67     {
  68       finished_ = span_;
  69       span_ = 0;
  70       if (Text_interface::is_markup (ott))
  71         {
  72           span_ = make_spanner ("OttavaBracket", SCM_EOL);
  73           span_->set_property ("text", ott);
  74
  75           SCM offset (get_property ("middleCOffset"));
  76           if (robust_scm2double (offset, 0) > 0)
  77             span_->set_property ("direction", scm_from_int (DOWN));
  78         }
  79     }
  80   last_ottavation_ = ott;
  81 }
  82
  83 void
  84 Ottava_spanner_engraver::acknowledge_note_column (Grob_info info)
  85 {
  86   Item *it = info.item ();
  87   if (span_ && it)
  88     {
  89       Side_position_interface::add_support (span_, it);
  90
  91       if (!span_->get_bound (LEFT))
  92         span_->set_bound (LEFT, it);
  93       span_->set_bound (RIGHT, it);
  94     }
  95 }
  96
  97 void
  98 Ottava_spanner_engraver::typeset_all ()
  99 {
 100   if (finished_)
 101     {
 102       Direction d = LEFT;
 103       do
 104         {
 105           if (!finished_->get_bound (RIGHT))
 106             {
 107               Grob *e = unsmob_grob (get_property ("currentMusicalColumn"));
 108               finished_->set_bound (d, e);
 109             }
 110         }
 111       while (flip (&d) != LEFT);
 112
 113       finished_ = 0;
 114     }
 115 }
 116
 117 void
 118 Ottava_spanner_engraver::stop_translation_timestep ()
 119 {
 120   if (span_ && !span_->get_bound (LEFT))
 121     {
 122       Grob *e = unsmob_grob (get_property ("currentMusicalColumn"));
 123       span_->set_bound (LEFT, e);
 124     }
 125
 126   typeset_all ();
 127 }
 128
 129 void
 130 Ottava_spanner_engraver::finalize ()
 131 {
 132   typeset_all ();
 133   if (span_)
 134     finished_ = span_;
 135   typeset_all ();
 136   last_ottavation_ = SCM_EOL;
 137 }
 138
 139 #include "translator.icc"
 140
 141 ADD_ACKNOWLEDGER (Ottava_spanner_engraver, note_column);
 142
 143 ADD_TRANSLATOR (Ottava_spanner_engraver,
 144                 /* doc */
 145                 "Create a text spanner when the ottavation property changes.",
 146
 147                 /* create */
 148                 "OttavaBracket ",
 149
 150                 /* read */
 151                 "ottavation "
 152                 "originalMiddleCPosition "
 153                 "currentMusicalColumn ",
 154
 155                 /* write */
 156                 ""
 157                 );