2 ' separating-line-group-engraver.cc -- implement Separating_line_group_engraver
4 source file of the GNU LilyPond music typesetter
6 (c) 1998--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>
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 #include "translator-group.hh"
24 Item * staff_spacing_;
25 Link_array<Item> note_spacings_;
32 bool is_empty () const
34 return !staff_spacing_ && !note_spacings_.size ();
38 note_spacings_.clear();
43 class Separating_line_group_engraver : public Engraver
48 Item * last_musical_item_;
50 Spacings current_spacings_;
51 Spacings last_spacings_;
55 virtual void acknowledge_grob (Grob_info);
56 virtual void process_music ();
57 virtual void finalize ();
58 virtual void stop_translation_timestep ();
59 virtual void start_translation_timestep ();
61 TRANSLATOR_DECLARATIONS(Separating_line_group_engraver);
64 Separating_line_group_engraver::Separating_line_group_engraver ()
72 Separating_line_group_engraver::process_music ()
77 sep_span_ = make_spanner ("SeparatingGroupSpanner");
79 announce_grob(sep_span_, SCM_EOL);
80 sep_span_->set_bound (LEFT, unsmob_grob (get_property ("currentCommandColumn")));
84 Separating_line_group_engraver::finalize ()
89 SCM ccol = get_property ("currentCommandColumn");
90 Grob *column = unsmob_grob (ccol);
92 sep_span_->set_bound (RIGHT, unsmob_grob (ccol));
93 typeset_grob (sep_span_);
96 for (int i= 0 ; i < last_spacings_.note_spacings_.size(); i++)
98 Pointer_group_interface::add_grob (last_spacings_.note_spacings_[i],
99 ly_symbol2scm ("right-items" ),
103 if(last_spacings_.staff_spacing_
104 && last_spacings_.staff_spacing_->get_column () == column)
106 last_spacings_.staff_spacing_->suicide ();
111 Separating_line_group_engraver::acknowledge_grob (Grob_info i)
113 Item * it = dynamic_cast <Item *> (i.grob_);
116 if (it->get_parent (X_AXIS)
117 && it->get_parent (X_AXIS)
118 ->has_extent_callback_b(Axis_group_interface::group_extent_callback_proc, X_AXIS))
122 if (to_boolean (it->get_grob_property ("no-spacing-rods")))
125 if (Note_spacing::has_interface (it))
127 current_spacings_.note_spacings_.push (it);
131 bool ib =Item::breakable_b (it);
132 Item *&p_ref_ (ib ? break_item_
137 p_ref_ = make_item ("SeparationItem");
141 p_ref_->set_grob_property ("breakable", SCM_BOOL_T);
142 daddy_trans_->set_property ("breakableSeparationItem", p_ref_->self_scm ());
144 announce_grob(p_ref_, SCM_EOL);
146 if (p_ref_ == break_item_)
148 Item *it = make_item ("StaffSpacing");
149 current_spacings_.staff_spacing_ = it;
150 it->set_grob_property ("left-items", gh_cons (break_item_->self_scm (), SCM_EOL));
152 announce_grob(it, SCM_EOL);
154 if (int i = last_spacings_.note_spacings_.size ())
157 Pointer_group_interface::add_grob (last_spacings_.note_spacings_[i],
158 ly_symbol2scm ("right-items"),
162 else if (last_spacings_.staff_spacing_)
165 last_spacings_.staff_spacing_->set_grob_property ("right-items",
166 gh_cons (break_item_->self_scm(), SCM_EOL));
171 if (Accidental_placement::has_interface (it))
172 Separation_item::add_conditional_item (p_ref_, it);
174 Separation_item::add_item (p_ref_,it);
178 Separating_line_group_engraver::start_translation_timestep ()
181 daddy_trans_->unset_property (ly_symbol2scm ("breakableSeparationItem"));
186 Separating_line_group_engraver::stop_translation_timestep ()
190 Separating_group_spanner::add_spacing_unit (sep_span_, break_item_);
191 typeset_grob (break_item_);
194 if (Item * sp = current_spacings_.staff_spacing_)
197 TODO: should really look at the left-items of following
201 Pointer_group_interface::add_grob (sp, ly_symbol2scm ("right-items"),
208 if (!current_spacings_.is_empty ())
210 last_spacings_ = current_spacings_;
213 current_spacings_.clear ();
217 Separating_group_spanner::add_spacing_unit (sep_span_, musical_item_);
218 typeset_grob (musical_item_);
225 ENTER_DESCRIPTION(Separating_line_group_engraver,
226 /* descr */ "Generates objects for computing spacing parameters.",
227 /* creats*/ "SeparationItem SeparatingGroupSpanner",
229 /* acks */ "item-interface",
231 /* write */ "breakableSeparationItem");