2 ' separating-line-group-engraver.cc -- implement Separating_line_group_engraver
4 source file of the GNU LilyPond music typesetter
6 (c) 1998--2002 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"
21 Item * staff_spacing_;
22 Link_array<Item> note_spacings_;
31 return !staff_spacing_ && !note_spacings_.size ();
35 note_spacings_.clear();
39 class Separating_line_group_engraver : public Engraver
43 Item * musical_malt_p_;
44 Item * last_musical_malt_p_;
46 Spacings current_spacings_;
47 Spacings last_spacings_;
49 Spanner * sep_span_p_;
51 virtual void acknowledge_grob (Grob_info);
52 virtual void initialize ();
53 virtual void finalize ();
54 virtual void stop_translation_timestep ();
55 virtual void start_translation_timestep ();
57 TRANSLATOR_DECLARATIONS(Separating_line_group_engraver);
60 Separating_line_group_engraver::Separating_line_group_engraver ()
68 Separating_line_group_engraver::initialize ()
70 sep_span_p_ = new Spanner (get_property ("SeparatingGroupSpanner"));
72 announce_grob (sep_span_p_, 0);
73 sep_span_p_->set_bound (LEFT, unsmob_grob (get_property ("currentCommandColumn")));
77 Separating_line_group_engraver::finalize ()
79 SCM ccol = get_property ("currentCommandColumn");
80 sep_span_p_->set_bound (RIGHT, unsmob_grob (ccol));
81 typeset_grob (sep_span_p_);
84 for (int i= 0 ; i < last_spacings_.note_spacings_.size(); i++)
86 last_spacings_.note_spacings_[i]->set_grob_property ("right-items", gh_cons (ccol, SCM_EOL));
89 if(last_spacings_.staff_spacing_
90 && last_spacings_.staff_spacing_->column_l () == unsmob_grob (ccol))
92 last_spacings_.staff_spacing_->suicide ();
97 Separating_line_group_engraver::acknowledge_grob (Grob_info i)
99 Item * it = dynamic_cast <Item *> (i.grob_l_);
102 if (it->get_parent (X_AXIS)
103 && it->get_parent (X_AXIS)
104 ->has_extent_callback_b(Axis_group_interface::group_extent_callback_proc, X_AXIS))
107 if (Note_spacing::has_interface (it))
109 current_spacings_.note_spacings_.push (it);
113 bool ib =Item::breakable_b (it);
114 Item *&p_ref_ (ib ? break_malt_p_
119 p_ref_ = new Item (get_property ("SeparationItem"));
122 p_ref_->set_grob_property ("breakable", SCM_BOOL_T);
123 announce_grob (p_ref_, 0);
125 if (p_ref_ == break_malt_p_)
127 Item *it = new Item (get_property ("StaffSpacing"));
128 current_spacings_.staff_spacing_ = it;
129 it->set_grob_property ("left-items", gh_cons (break_malt_p_->self_scm (), SCM_EOL));
131 announce_grob (it, 0);
133 if (int i = last_spacings_.note_spacings_.size ())
136 Pointer_group_interface::add_grob (last_spacings_.note_spacings_[i],
137 ly_symbol2scm ("right-items"),
141 else if (last_spacings_.staff_spacing_)
144 last_spacings_.staff_spacing_->set_grob_property ("right-items",
145 gh_cons (break_malt_p_->self_scm(), SCM_EOL));
150 Separation_item::add_item (p_ref_,it);
154 Separating_line_group_engraver::start_translation_timestep ()
160 Separating_line_group_engraver::stop_translation_timestep ()
164 Separating_group_spanner::add_spacing_unit (sep_span_p_, break_malt_p_);
165 typeset_grob (break_malt_p_);
170 if (Item * sp = current_spacings_.staff_spacing_)
173 TODO: should really look at the left-items of following
177 Pointer_group_interface::add_grob (sp, ly_symbol2scm ("right-items"),
183 if (!current_spacings_.empty ())
185 last_spacings_ = current_spacings_;
188 current_spacings_.clear ();
192 Separating_group_spanner::add_spacing_unit (sep_span_p_, musical_malt_p_);
193 typeset_grob (musical_malt_p_);
203 ENTER_DESCRIPTION(Separating_line_group_engraver,
204 /* descr */ "Generates objects for computing spacing parameters.",
205 /* creats*/ "SeparationItem SeparatingGroupSpanner",
206 /* acks */ "grob-interface",