lily/separating-line-group-engraver.cc

   1 /*
   2 '  separating-line-group-engraver.cc --  implement Separating_line_group_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1998--2003 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7
   8  */
   9
  10 #include "separating-group-spanner.hh"
  11 #include "separation-item.hh"
  12 #include "paper-column.hh"
  13 #include "paper-def.hh"
  14 #include "engraver.hh"
  15 #include "axis-group-interface.hh"
  16 #include "note-spacing.hh"
  17 #include "group-interface.hh"
  18 #include "accidental-placement.hh"
  19
  20 struct Spacings
  21 {
  22   Item * staff_spacing_;
  23   Link_array<Item> note_spacings_;
  24
  25   Spacings ()
  26   {
  27     staff_spacing_ = 0;
  28   }
  29
  30   bool empty( )const
  31   {
  32     return !staff_spacing_ && !note_spacings_.size ();
  33   }
  34   void clear () {
  35     staff_spacing_ = 0;
  36     note_spacings_.clear();
  37   }
  38 };
  39
  40 class Separating_line_group_engraver : public Engraver
  41 {
  42 protected:
  43   Item * break_malt_;
  44   Item * musical_malt_;
  45   Item * last_musical_malt_;
  46
  47   Spacings current_spacings_;
  48   Spacings last_spacings_;
  49
  50   Spanner * sep_span_;
  51
  52   virtual void acknowledge_grob (Grob_info);
  53   virtual void initialize ();
  54   virtual void finalize ();
  55   virtual void stop_translation_timestep ();
  56   virtual void start_translation_timestep ();
  57 public:
  58   TRANSLATOR_DECLARATIONS(Separating_line_group_engraver);
  59 };
  60
  61 Separating_line_group_engraver::Separating_line_group_engraver ()
  62 {
  63   sep_span_ = 0;
  64   break_malt_ = 0;
  65   musical_malt_ =0;
  66 }
  67
  68 void
  69 Separating_line_group_engraver::initialize ()
  70 {
  71   sep_span_ = new Spanner (get_property ("SeparatingGroupSpanner"));
  72
  73   announce_grob(sep_span_, SCM_EOL);
  74   sep_span_->set_bound (LEFT, unsmob_grob (get_property ("currentCommandColumn")));
  75 }
  76
  77 void
  78 Separating_line_group_engraver::finalize ()
  79 {
  80   SCM ccol = get_property ("currentCommandColumn");
  81   Grob *column = unsmob_grob (ccol);
  82
  83   sep_span_->set_bound (RIGHT, unsmob_grob (ccol));
  84   typeset_grob (sep_span_);
  85   sep_span_ =0;
  86
  87   for  (int i= 0 ; i < last_spacings_.note_spacings_.size(); i++)
  88     {
  89       Pointer_group_interface::add_grob (last_spacings_.note_spacings_[i],
  90                                          ly_symbol2scm ("right-items" ),
  91                                          column);
  92     }
  93
  94   if(last_spacings_.staff_spacing_
  95      && last_spacings_.staff_spacing_->get_column () == column)
  96     {
  97       last_spacings_.staff_spacing_->suicide ();
  98     }
  99 }
 100
 101 void
 102 Separating_line_group_engraver::acknowledge_grob (Grob_info i)
 103 {
 104   Item * it = dynamic_cast <Item *> (i.grob_);
 105   if (!it)
 106     return;
 107   if (it->get_parent (X_AXIS)
 108       && it->get_parent (X_AXIS)
 109       ->has_extent_callback_b(Axis_group_interface::group_extent_callback_proc, X_AXIS))
 110     return;
 111
 112
 113   if (to_boolean (it->get_grob_property ("no-spacing-rods")))
 114     return ;
 115
 116   if (Note_spacing::has_interface (it))
 117     {
 118       current_spacings_.note_spacings_.push (it);
 119       return ;
 120     }
 121
 122   bool ib =Item::breakable_b (it);
 123   Item *&p_ref_ (ib ? break_malt_
 124                  : musical_malt_);
 125
 126   if (!p_ref_)
 127     {
 128       p_ref_ = new Item (get_property ("SeparationItem"));
 129
 130       if (ib)
 131         p_ref_->set_grob_property ("breakable", SCM_BOOL_T);
 132       announce_grob(p_ref_, SCM_EOL);
 133
 134       if (p_ref_ == break_malt_)
 135         {
 136           Item *it  = new Item (get_property ("StaffSpacing"));
 137           current_spacings_.staff_spacing_ = it;
 138           it->set_grob_property ("left-items", gh_cons (break_malt_->self_scm (), SCM_EOL));
 139
 140           announce_grob(it, SCM_EOL);
 141
 142           if (int i = last_spacings_.note_spacings_.size ())
 143             {
 144               for (; i--;)
 145                 Pointer_group_interface::add_grob (last_spacings_.note_spacings_[i],
 146                                                    ly_symbol2scm ("right-items"),
 147                                                    break_malt_);
 148
 149             }
 150           else if (last_spacings_.staff_spacing_)
 151             {
 152
 153               last_spacings_.staff_spacing_->set_grob_property ("right-items",
 154                                                                 gh_cons (break_malt_->self_scm(), SCM_EOL));
 155             }
 156         }
 157     }
 158
 159   if (Accidental_placement::has_interface (it))
 160     Separation_item::add_conditional_item (p_ref_, it);
 161   else
 162     Separation_item::add_item (p_ref_,it);
 163 }
 164
 165 void
 166 Separating_line_group_engraver::start_translation_timestep ()
 167 {
 168
 169 }
 170
 171 void
 172 Separating_line_group_engraver::stop_translation_timestep ()
 173 {
 174   if (break_malt_)
 175     {
 176       Separating_group_spanner::add_spacing_unit (sep_span_, break_malt_);
 177       typeset_grob (break_malt_);
 178
 179       break_malt_ =0;
 180     }
 181
 182   if (Item * sp = current_spacings_.staff_spacing_)
 183     {
 184       /*
 185         TODO: should really look at the left-items of following
 186         note-spacing grobs.
 187        */
 188       if (musical_malt_)
 189         Pointer_group_interface::add_grob (sp, ly_symbol2scm ("right-items"),
 190                                            musical_malt_);
 191
 192       typeset_grob (sp);
 193     }
 194
 195
 196   if (!current_spacings_.empty ())
 197     {
 198       last_spacings_ = current_spacings_;
 199     }
 200
 201   current_spacings_.clear ();
 202
 203   if (musical_malt_)
 204     {
 205       Separating_group_spanner::add_spacing_unit (sep_span_, musical_malt_);
 206       typeset_grob (musical_malt_);
 207     }
 208
 209   musical_malt_ =0;
 210 }
 211
 212
 213 ENTER_DESCRIPTION(Separating_line_group_engraver,
 214 /* descr */       "Generates objects for computing spacing parameters.",
 215 /* creats*/       "SeparationItem SeparatingGroupSpanner",
 216 /* accepts */     "",
 217 /* acks  */      "item-interface",
 218 /* reads */       "",
 219 /* write */       "");