2 ' separating-line-group-engraver.cc -- implement Separating_line_group_engraver
4 source file of the GNU LilyPond music typesetter
6 (c) 1998--2005 Han-Wen Nienhuys <hanwen@cs.uu.nl>
11 #include "separating-group-spanner.hh"
12 #include "separation-item.hh"
13 #include "paper-column.hh"
14 #include "output-def.hh"
15 #include "axis-group-interface.hh"
16 #include "note-spacing.hh"
17 #include "accidental-placement.hh"
19 #include "grob-array.hh"
20 #include "pointer-group-interface.hh"
25 Link_array<Item> note_spacings_;
32 bool is_empty () const
34 return !staff_spacing_ && !note_spacings_.size ();
39 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 PRECOMPUTED_VIRTUAL void process_music ();
57 virtual void finalize ();
58 PRECOMPUTED_VIRTUAL void stop_translation_timestep ();
59 PRECOMPUTED_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", SCM_EOL);
79 sep_span_->set_bound (LEFT, unsmob_grob (get_property ("currentCommandColumn")));
83 Separating_line_group_engraver::finalize ()
88 SCM ccol = get_property ("currentCommandColumn");
89 Grob *column = unsmob_grob (ccol);
91 sep_span_->set_bound (RIGHT, unsmob_grob (ccol));
94 for (int i = 0; i < last_spacings_.note_spacings_.size (); i++)
96 Pointer_group_interface::add_grob (last_spacings_.note_spacings_[i],
97 ly_symbol2scm ("right-items"),
101 if (last_spacings_.staff_spacing_
102 && last_spacings_.staff_spacing_->get_column () == column)
104 last_spacings_.staff_spacing_->suicide ();
109 Separating_line_group_engraver::acknowledge_grob (Grob_info i)
111 Item *it = dynamic_cast<Item *> (i.grob ());
114 if (it->get_parent (X_AXIS)
115 && it->get_parent (X_AXIS)
116 ->has_extent_callback (Axis_group_interface::group_extent_callback_proc, X_AXIS))
119 if (to_boolean (it->get_property ("no-spacing-rods")))
122 if (Note_spacing::has_interface (it))
124 current_spacings_.note_spacings_.push (it);
128 bool ib = Item::is_breakable (it);
129 Item *&p_ref_ (ib ? break_item_
134 p_ref_ = make_item ("SeparationItem", SCM_EOL);
138 p_ref_->set_property ("breakable", SCM_BOOL_T);
139 context ()->set_property ("breakableSeparationItem", p_ref_->self_scm ());
142 if (to_boolean (get_property ("createSpacing"))
143 && p_ref_ == break_item_)
145 Item *it = make_item ("StaffSpacing", SCM_EOL);
146 current_spacings_.staff_spacing_ = it;
147 Pointer_group_interface::add_grob (it, ly_symbol2scm ("left-items"),
150 if (int i = last_spacings_.note_spacings_.size ())
153 Pointer_group_interface::add_grob (last_spacings_.note_spacings_[i],
154 ly_symbol2scm ("right-items"),
157 else if (last_spacings_.staff_spacing_)
159 SCM ri = last_spacings_.staff_spacing_->get_object ("right-items");
160 Grob_array *ga = unsmob_grob_array (ri);
163 SCM ga_scm = Grob_array::make_array ();
164 last_spacings_.staff_spacing_->set_object ("right-items", ga_scm);
165 ga = unsmob_grob_array (ga_scm);
169 ga->add (break_item_);
174 if (Accidental_placement::has_interface (it))
175 Separation_item::add_conditional_item (p_ref_, it);
177 Separation_item::add_item (p_ref_, it);
181 Separating_line_group_engraver::start_translation_timestep ()
185 context ()->unset_property (ly_symbol2scm ("breakableSeparationItem"));
191 Separating_line_group_engraver::stop_translation_timestep ()
195 Separating_group_spanner::add_spacing_unit (sep_span_, break_item_);
198 if (Item *sp = current_spacings_.staff_spacing_)
201 TODO: should really look at the left-items of following
205 Pointer_group_interface::add_grob (sp, ly_symbol2scm ("right-items"),
209 if (!current_spacings_.is_empty ())
211 last_spacings_ = current_spacings_;
214 current_spacings_.clear ();
218 Separating_group_spanner::add_spacing_unit (sep_span_, musical_item_);
224 #include "translator.icc"
226 ADD_TRANSLATOR (Separating_line_group_engraver,
227 /* descr */ "Generates objects for computing spacing parameters.",
228 /* creats*/ "SeparationItem SeparatingGroupSpanner StaffSpacing",
230 /* acks */ "item-interface",
231 /* reads */ "createSpacing",
232 /* write */ "breakableSeparationItem");