lily/note-spacing-engraver.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 2006--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 #include "engraver.hh"
  21
  22 #include "grob-array.hh"
  23 #include "context.hh"
  24 #include "item.hh"
  25 #include "pointer-group-interface.hh"
  26
  27 #include <map>
  28
  29 #include "translator.icc"
  30
  31 class Note_spacing_engraver : public Engraver
  32 {
  33   typedef map <Context*, Grob*> Last_spacing_map;
  34   Last_spacing_map last_spacings_;
  35   Grob *last_spacing_;
  36
  37   Grob *spacing_;
  38
  39   void add_spacing_item (Grob *);
  40   TRANSLATOR_DECLARATIONS (Note_spacing_engraver);
  41 protected:
  42
  43   DECLARE_ACKNOWLEDGER (rhythmic_grob);
  44   DECLARE_ACKNOWLEDGER (note_column);
  45   void stop_translation_timestep ();
  46   virtual void finalize ();
  47   virtual void derived_mark () const;
  48 };
  49
  50 void
  51 Note_spacing_engraver::derived_mark () const
  52 {
  53   for (Last_spacing_map::const_iterator i = last_spacings_.begin ();
  54        i != last_spacings_.end (); i++)
  55     scm_gc_mark (i->first->self_scm ());
  56 }
  57
  58 Note_spacing_engraver::Note_spacing_engraver ()
  59 {
  60   spacing_ = 0;
  61   last_spacing_ = 0;
  62 }
  63
  64 void
  65 Note_spacing_engraver::add_spacing_item (Grob *g)
  66 {
  67   if (!spacing_)
  68     {
  69       spacing_ = make_item ("NoteSpacing", g->self_scm ());
  70     }
  71
  72   if (spacing_)
  73     {
  74       Pointer_group_interface::add_grob (spacing_,
  75                                          ly_symbol2scm ("left-items"),
  76                                          g);
  77
  78       if (last_spacing_)
  79         Pointer_group_interface::add_grob (last_spacing_,
  80                                            ly_symbol2scm ("right-items"),
  81                                            g);
  82     }
  83 }
  84
  85
  86 void
  87 Note_spacing_engraver::acknowledge_note_column (Grob_info gi)
  88 {
  89   add_spacing_item (gi.grob ());
  90 }
  91
  92 void
  93 Note_spacing_engraver::acknowledge_rhythmic_grob (Grob_info gi)
  94 {
  95   add_spacing_item (gi.grob ());
  96 }
  97
  98 void
  99 Note_spacing_engraver::finalize ()
 100 {
 101   Context *parent = context ()->get_parent_context ();
 102   Grob *last_spacing = last_spacings_[parent];
 103
 104   if (last_spacing
 105       && !unsmob_grob_array (last_spacing->get_object ("right-items")))
 106     {
 107       Grob *col  = unsmob_grob (get_property ("currentCommandColumn"));
 108
 109       Pointer_group_interface::add_grob (last_spacing,
 110                                          ly_symbol2scm ("right-items"),
 111                                          col);
 112     }
 113 }
 114
 115 void
 116 Note_spacing_engraver::stop_translation_timestep ()
 117 {
 118   Context *parent = context ()->get_parent_context ();
 119   Grob *last_spacing = last_spacings_[parent];
 120
 121   if (last_spacing
 122       && to_boolean (get_property ("hasStaffSpacing")))
 123     {
 124       Grob *col = unsmob_grob (get_property ("currentCommandColumn"));
 125       Pointer_group_interface::add_grob (last_spacing,
 126                                          ly_symbol2scm ("right-items"),
 127                                          col);
 128     }
 129
 130   if (spacing_)
 131     {
 132       last_spacings_[parent] = spacing_;
 133       last_spacing_ = spacing_;
 134       spacing_ = 0;
 135     }
 136
 137 }
 138
 139 ADD_ACKNOWLEDGER (Note_spacing_engraver, note_column);
 140 ADD_ACKNOWLEDGER (Note_spacing_engraver, rhythmic_grob);
 141
 142 ADD_TRANSLATOR (Note_spacing_engraver,
 143                 /* doc */
 144                 "Generate @code{NoteSpacing}, an object linking horizontal"
 145                 " lines for use in spacing.",
 146
 147                 /* create */
 148                 "NoteSpacing ",
 149
 150                 /* read */
 151                 "",
 152
 153                 /* write */
 154                 ""
 155                 );