2 separating-line-group-engraver.cc -- implement Separating_line_group_engraver
4 source file of the GNU LilyPond music typesetter
6 (c) 1998--2006 Han-Wen Nienhuys <hanwen@xs4all.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"
20 #include "grob-array.hh"
21 #include "pointer-group-interface.hh"
23 #include "translator.icc"
28 vector<Item*> note_spacings_;
35 bool is_empty () const
37 return !staff_spacing_ && !note_spacings_.size ();
42 note_spacings_.clear ();
46 class Separating_line_group_engraver : public Engraver
51 Item *last_musical_item_;
53 Spacings current_spacings_;
54 Spacings last_spacings_;
58 DECLARE_ACKNOWLEDGER (item);
59 void process_music ();
60 virtual void finalize ();
61 void stop_translation_timestep ();
62 void start_translation_timestep ();
64 TRANSLATOR_DECLARATIONS (Separating_line_group_engraver);
67 Separating_line_group_engraver::Separating_line_group_engraver ()
75 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 if (last_spacings_.staff_spacing_
97 && last_spacings_.staff_spacing_->get_column () == column)
98 last_spacings_.staff_spacing_->suicide ();
102 Separating_line_group_engraver::acknowledge_item (Grob_info i)
104 Item *it = i.item ();
105 if (it->get_parent (X_AXIS)
106 && it->get_parent (X_AXIS) == it->get_parent (Y_AXIS)
107 && Axis_group_interface::has_axis (it->get_parent (X_AXIS), X_AXIS)
108 && Axis_group_interface::has_axis (it->get_parent (Y_AXIS), Y_AXIS))
111 if (to_boolean (it->get_property ("no-spacing-rods")))
114 if (Note_spacing::has_interface (it))
116 current_spacings_.note_spacings_.push_back (it);
120 bool ib = Item::is_non_musical (it);
121 Item *&p_ref_ (ib ? break_item_
126 p_ref_ = make_item ("SeparationItem", SCM_EOL);
130 p_ref_->set_property ("non-musical", SCM_BOOL_T);
131 context ()->set_property ("breakableSeparationItem", p_ref_->self_scm ());
134 if (to_boolean (get_property ("createSpacing"))
135 && p_ref_ == break_item_)
137 Item *it = make_item ("StaffSpacing", SCM_EOL);
138 current_spacings_.staff_spacing_ = it;
139 Pointer_group_interface::add_grob (it, ly_symbol2scm ("left-items"),
142 if (!last_spacings_.note_spacings_.size ()
143 && last_spacings_.staff_spacing_)
145 SCM ri = last_spacings_.staff_spacing_->get_object ("right-items");
146 Grob_array *ga = unsmob_grob_array (ri);
149 SCM ga_scm = Grob_array::make_array ();
150 last_spacings_.staff_spacing_->set_object ("right-items", ga_scm);
151 ga = unsmob_grob_array (ga_scm);
155 ga->add (break_item_);
160 if (Accidental_placement::has_interface (it))
161 Separation_item::add_conditional_item (p_ref_, it);
163 Separation_item::add_item (p_ref_, it);
167 Separating_line_group_engraver::start_translation_timestep ()
171 context ()->unset_property (ly_symbol2scm ("breakableSeparationItem"));
177 Separating_line_group_engraver::stop_translation_timestep ()
180 Separating_group_spanner::add_spacing_unit (sep_span_, break_item_);
182 if (Item *sp = current_spacings_.staff_spacing_)
185 TODO: should really look at the left-items of following
189 Pointer_group_interface::add_grob (sp, ly_symbol2scm ("right-items"),
193 if (!current_spacings_.is_empty ())
194 last_spacings_ = current_spacings_;
196 current_spacings_.clear ();
199 Separating_group_spanner::add_spacing_unit (sep_span_, musical_item_);
204 ADD_ACKNOWLEDGER (Separating_line_group_engraver, item);
205 ADD_TRANSLATOR (Separating_line_group_engraver,
206 /* doc */ "Generates objects for computing spacing parameters.",
210 "SeparatingGroupSpanner "
212 /* read */ "createSpacing",
213 /* write */ "breakableSeparationItem");