2 ' separating-line-group-engraver.cc -- implement Separating_line_group_engraver
4 source file of the GNU LilyPond music typesetter
6 (c) 1998--2004 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"
18 #include "accidental-placement.hh"
25 Item
* staff_spacing_
;
26 Link_array
<Item
> note_spacings_
;
33 bool is_empty () const
35 return !staff_spacing_
&& !note_spacings_
.size ();
39 note_spacings_
.clear ();
44 class Separating_line_group_engraver
: public Engraver
49 Item
* last_musical_item_
;
51 Spacings current_spacings_
;
52 Spacings last_spacings_
;
56 virtual void acknowledge_grob (Grob_info
);
57 virtual void process_music ();
58 virtual void finalize ();
59 virtual void stop_translation_timestep ();
60 virtual void start_translation_timestep ();
62 TRANSLATOR_DECLARATIONS (Separating_line_group_engraver
);
65 Separating_line_group_engraver::Separating_line_group_engraver ()
73 Separating_line_group_engraver::process_music ()
78 sep_span_
= make_spanner ("SeparatingGroupSpanner");
80 announce_grob (sep_span_
, 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
));
94 typeset_grob (sep_span_
);
97 for (int i
= 0 ; i
< last_spacings_
.note_spacings_
.size (); i
++)
99 Pointer_group_interface::add_grob (last_spacings_
.note_spacings_
[i
],
100 ly_symbol2scm ("right-items" ),
104 if (last_spacings_
.staff_spacing_
105 && last_spacings_
.staff_spacing_
->get_column () == column
)
107 last_spacings_
.staff_spacing_
->suicide ();
112 Separating_line_group_engraver::acknowledge_grob (Grob_info i
)
114 Item
* it
= dynamic_cast <Item
*> (i
.grob_
);
117 if (it
->get_parent (X_AXIS
)
118 && it
->get_parent (X_AXIS
)
119 ->has_extent_callback (Axis_group_interface::group_extent_callback_proc
, X_AXIS
))
123 if (to_boolean (it
->get_property ("no-spacing-rods")))
126 if (Note_spacing::has_interface (it
))
128 current_spacings_
.note_spacings_
.push (it
);
132 bool ib
=Item::is_breakable (it
);
133 Item
*&p_ref_ (ib
? break_item_
138 p_ref_
= make_item ("SeparationItem");
142 p_ref_
->set_property ("breakable", SCM_BOOL_T
);
143 daddy_context_
->set_property ("breakableSeparationItem", p_ref_
->self_scm ());
145 announce_grob (p_ref_
, SCM_EOL
);
147 if (to_boolean (get_property ("createSpacing"))
148 && p_ref_
== break_item_
)
150 Item
*it
= make_item ("StaffSpacing");
151 current_spacings_
.staff_spacing_
= it
;
152 it
->set_property ("left-items", scm_cons (break_item_
->self_scm (), SCM_EOL
));
154 announce_grob (it
, SCM_EOL
);
156 if (int i
= last_spacings_
.note_spacings_
.size ())
159 Pointer_group_interface::add_grob (last_spacings_
.note_spacings_
[i
],
160 ly_symbol2scm ("right-items"),
164 else if (last_spacings_
.staff_spacing_
)
166 last_spacings_
.staff_spacing_
->set_property ("right-items",
167 scm_cons (break_item_
->self_scm (), SCM_EOL
));
172 if (Accidental_placement::has_interface (it
))
173 Separation_item::add_conditional_item (p_ref_
, it
);
175 Separation_item::add_item (p_ref_
,it
);
179 Separating_line_group_engraver::start_translation_timestep ()
182 daddy_context_
->unset_property (ly_symbol2scm ("breakableSeparationItem"));
187 Separating_line_group_engraver::stop_translation_timestep ()
191 Separating_group_spanner::add_spacing_unit (sep_span_
, break_item_
);
192 typeset_grob (break_item_
);
195 if (Item
* sp
= current_spacings_
.staff_spacing_
)
198 TODO: should really look at the left-items of following
202 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_
);
219 typeset_grob (musical_item_
);
226 ENTER_DESCRIPTION (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");