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"
22 #include "translator.icc"
27 Link_array<Item> note_spacings_;
34 bool is_empty () const
36 return !staff_spacing_ && !note_spacings_.size ();
41 note_spacings_.clear ();
45 class Separating_line_group_engraver : public Engraver
50 Item *last_musical_item_;
52 Spacings current_spacings_;
53 Spacings last_spacings_;
57 DECLARE_ACKNOWLEDGER (item);
58 void process_music ();
59 virtual void finalize ();
60 void stop_translation_timestep ();
61 void start_translation_timestep ();
63 TRANSLATOR_DECLARATIONS (Separating_line_group_engraver);
66 Separating_line_group_engraver::Separating_line_group_engraver ()
74 Separating_line_group_engraver::process_music ()
79 sep_span_ = make_spanner ("SeparatingGroupSpanner", SCM_EOL);
81 sep_span_->set_bound (LEFT, unsmob_grob (get_property ("currentCommandColumn")));
85 Separating_line_group_engraver::finalize ()
90 SCM ccol = get_property ("currentCommandColumn");
91 Grob *column = unsmob_grob (ccol);
93 sep_span_->set_bound (RIGHT, unsmob_grob (ccol));
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_item (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 (Axis_group_interface::group_extent_callback_proc, X_AXIS))
121 if (to_boolean (it->get_property ("no-spacing-rods")))
124 if (Note_spacing::has_interface (it))
126 current_spacings_.note_spacings_.push (it);
130 bool ib = Item::is_breakable (it);
131 Item *&p_ref_ (ib ? break_item_
136 p_ref_ = make_item ("SeparationItem", SCM_EOL);
140 p_ref_->set_property ("breakable", SCM_BOOL_T);
141 context ()->set_property ("breakableSeparationItem", p_ref_->self_scm ());
144 if (to_boolean (get_property ("createSpacing"))
145 && p_ref_ == break_item_)
147 Item *it = make_item ("StaffSpacing", SCM_EOL);
148 current_spacings_.staff_spacing_ = it;
149 Pointer_group_interface::add_grob (it, ly_symbol2scm ("left-items"),
152 if (int i = last_spacings_.note_spacings_.size ())
155 Pointer_group_interface::add_grob (last_spacings_.note_spacings_[i],
156 ly_symbol2scm ("right-items"),
159 else if (last_spacings_.staff_spacing_)
161 SCM ri = last_spacings_.staff_spacing_->get_object ("right-items");
162 Grob_array *ga = unsmob_grob_array (ri);
165 SCM ga_scm = Grob_array::make_array ();
166 last_spacings_.staff_spacing_->set_object ("right-items", ga_scm);
167 ga = unsmob_grob_array (ga_scm);
171 ga->add (break_item_);
176 if (Accidental_placement::has_interface (it))
177 Separation_item::add_conditional_item (p_ref_, it);
179 Separation_item::add_item (p_ref_, it);
183 Separating_line_group_engraver::start_translation_timestep ()
187 context ()->unset_property (ly_symbol2scm ("breakableSeparationItem"));
193 Separating_line_group_engraver::stop_translation_timestep ()
197 Separating_group_spanner::add_spacing_unit (sep_span_, break_item_);
200 if (Item *sp = current_spacings_.staff_spacing_)
203 TODO: should really look at the left-items of following
207 Pointer_group_interface::add_grob (sp, ly_symbol2scm ("right-items"),
211 if (!current_spacings_.is_empty ())
213 last_spacings_ = current_spacings_;
216 current_spacings_.clear ();
220 Separating_group_spanner::add_spacing_unit (sep_span_, musical_item_);
226 ADD_ACKNOWLEDGER (Separating_line_group_engraver, item);
227 ADD_TRANSLATOR (Separating_line_group_engraver,
228 /* descr */ "Generates objects for computing spacing parameters.",
229 /* creats*/ "SeparationItem SeparatingGroupSpanner StaffSpacing",
231 /* reads */ "createSpacing",
232 /* write */ "breakableSeparationItem");