2 separating-line-group-engraver.cc -- implement Separating_line_group_engraver
4 source file of the GNU LilyPond music typesetter
6 (c) 1998--2007 Han-Wen Nienhuys <hanwen@xs4all.nl>
11 #include "separation-item.hh"
12 #include "paper-column.hh"
13 #include "output-def.hh"
14 #include "axis-group-interface.hh"
15 #include "note-spacing.hh"
16 #include "accidental-placement.hh"
19 #include "grob-array.hh"
20 #include "pointer-group-interface.hh"
22 #include "translator.icc"
27 vector<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_;
55 DECLARE_ACKNOWLEDGER (item);
56 void stop_translation_timestep ();
57 void start_translation_timestep ();
59 TRANSLATOR_DECLARATIONS (Separating_line_group_engraver);
62 Separating_line_group_engraver::Separating_line_group_engraver ()
69 Separating_line_group_engraver::acknowledge_item (Grob_info i)
72 if (it->get_parent (X_AXIS)
73 && it->get_parent (X_AXIS) == it->get_parent (Y_AXIS)
74 && Axis_group_interface::has_axis (it->get_parent (X_AXIS), X_AXIS)
75 && Axis_group_interface::has_axis (it->get_parent (Y_AXIS), Y_AXIS))
78 if (to_boolean (it->get_property ("no-spacing-rods")))
81 if (Note_spacing::has_interface (it))
83 current_spacings_.note_spacings_.push_back (it);
87 bool ib = Item::is_non_musical (it);
88 Item *&p_ref_ (ib ? break_item_
93 p_ref_ = make_item ("SeparationItem", SCM_EOL);
97 p_ref_->set_property ("non-musical", SCM_BOOL_T);
98 context ()->set_property ("breakableSeparationItem", p_ref_->self_scm ());
101 if (to_boolean (get_property ("createSpacing"))
102 && p_ref_ == break_item_)
104 Item *it = make_item ("StaffSpacing", SCM_EOL);
105 current_spacings_.staff_spacing_ = it;
106 Pointer_group_interface::add_grob (it, ly_symbol2scm ("left-items"),
109 if (!last_spacings_.note_spacings_.size ()
110 && last_spacings_.staff_spacing_)
112 SCM ri = last_spacings_.staff_spacing_->get_object ("right-items");
113 Grob_array *ga = unsmob_grob_array (ri);
116 SCM ga_scm = Grob_array::make_array ();
117 last_spacings_.staff_spacing_->set_object ("right-items", ga_scm);
118 ga = unsmob_grob_array (ga_scm);
122 ga->add (break_item_);
127 if (Accidental_placement::has_interface (it))
128 Separation_item::add_conditional_item (p_ref_, it);
130 Separation_item::add_item (p_ref_, it);
134 Separating_line_group_engraver::start_translation_timestep ()
138 context ()->unset_property (ly_symbol2scm ("breakableSeparationItem"));
144 Separating_line_group_engraver::stop_translation_timestep ()
146 if (Item *sp = current_spacings_.staff_spacing_)
149 TODO: should really look at the left-items of following
153 Pointer_group_interface::add_grob (sp, ly_symbol2scm ("right-items"),
157 if (!current_spacings_.is_empty ())
158 last_spacings_ = current_spacings_;
160 current_spacings_.clear ();
165 ADD_ACKNOWLEDGER (Separating_line_group_engraver, item);
166 ADD_TRANSLATOR (Separating_line_group_engraver,
167 /* doc */ "Generates objects for computing spacing parameters.",
171 "SeparatingGroupSpanner "
173 /* read */ "createSpacing",
174 /* write */ "breakableSeparationItem");