lily/note-spacing-engraver.cc

   1 /*
   2   note-spacing-engraver.cc -- implement Note_spacing_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2006--2009 Han-Wen Nienhuys <hanwen@lilypond.org>
   7
   8 */
   9
  10 #include "engraver.hh"
  11
  12 #include "grob-array.hh"
  13 #include "context.hh"
  14 #include "item.hh"
  15 #include "pointer-group-interface.hh"
  16
  17 #include <map>
  18
  19 #include "translator.icc"
  20
  21 class Note_spacing_engraver : public Engraver
  22 {
  23   typedef map <Context*, Grob*> Last_spacing_map;
  24   Last_spacing_map last_spacings_;
  25   Grob *last_spacing_;
  26
  27   Grob *spacing_;
  28
  29   void add_spacing_item (Grob *);
  30   TRANSLATOR_DECLARATIONS (Note_spacing_engraver);
  31 protected:
  32
  33   DECLARE_ACKNOWLEDGER (rhythmic_grob);
  34   DECLARE_ACKNOWLEDGER (note_column);
  35   void stop_translation_timestep ();
  36   virtual void finalize ();
  37   virtual void derived_mark () const;
  38 };
  39
  40 void
  41 Note_spacing_engraver::derived_mark () const
  42 {
  43   for (Last_spacing_map::const_iterator i = last_spacings_.begin ();
  44        i != last_spacings_.end (); i++)
  45     scm_gc_mark (i->first->self_scm ());
  46 }
  47
  48 Note_spacing_engraver::Note_spacing_engraver ()
  49 {
  50   spacing_ = 0;
  51   last_spacing_ = 0;
  52 }
  53
  54 void
  55 Note_spacing_engraver::add_spacing_item (Grob *g)
  56 {
  57   if (!spacing_)
  58     {
  59       spacing_ = make_item ("NoteSpacing", g->self_scm ());
  60     }
  61
  62   if (spacing_)
  63     {
  64       Pointer_group_interface::add_grob (spacing_,
  65                                          ly_symbol2scm ("left-items"),
  66                                          g);
  67
  68       if (last_spacing_)
  69         Pointer_group_interface::add_grob (last_spacing_,
  70                                            ly_symbol2scm ("right-items"),
  71                                            g);
  72     }
  73 }
  74
  75
  76 void
  77 Note_spacing_engraver::acknowledge_note_column (Grob_info gi)
  78 {
  79   add_spacing_item (gi.grob ());
  80 }
  81
  82 void
  83 Note_spacing_engraver::acknowledge_rhythmic_grob (Grob_info gi)
  84 {
  85   add_spacing_item (gi.grob ());
  86 }
  87
  88 void
  89 Note_spacing_engraver::finalize ()
  90 {
  91   Context *parent = context ()->get_parent_context ();
  92   Grob *last_spacing = last_spacings_[parent];
  93
  94   if (last_spacing
  95       && !unsmob_grob_array (last_spacing->get_object ("right-items")))
  96     {
  97       Grob *col  = unsmob_grob (get_property ("currentCommandColumn"));
  98
  99       Pointer_group_interface::add_grob (last_spacing,
 100                                          ly_symbol2scm ("right-items"),
 101                                          col);
 102     }
 103 }
 104
 105 void
 106 Note_spacing_engraver::stop_translation_timestep ()
 107 {
 108   Context *parent = context ()->get_parent_context ();
 109   Grob *last_spacing = last_spacings_[parent];
 110
 111   if (last_spacing
 112       && to_boolean (get_property ("hasStaffSpacing")))
 113     {
 114       Grob *col = unsmob_grob (get_property ("currentCommandColumn"));
 115       Pointer_group_interface::add_grob (last_spacing,
 116                                          ly_symbol2scm ("right-items"),
 117                                          col);
 118     }
 119
 120   if (spacing_)
 121     {
 122       last_spacings_[parent] = spacing_;
 123       last_spacing_ = spacing_;
 124       spacing_ = 0;
 125     }
 126
 127 }
 128
 129 ADD_ACKNOWLEDGER (Note_spacing_engraver, note_column);
 130 ADD_ACKNOWLEDGER (Note_spacing_engraver, rhythmic_grob);
 131
 132 ADD_TRANSLATOR (Note_spacing_engraver,
 133                 /* doc */
 134                 "Generate @code{NoteSpacing}, an object linking horizontal"
 135                 " lines for use in spacing.",
 136
 137                 /* create */
 138                 "NoteSpacing ",
 139
 140                 /* read */
 141                 "",
 142
 143                 /* write */
 144                 ""
 145                 );