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 "output-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", 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_grob (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
))
122 if (to_boolean (it
->get_property ("no-spacing-rods")))
125 if (Note_spacing::has_interface (it
))
127 current_spacings_
.note_spacings_
.push (it
);
131 bool ib
=Item::is_breakable (it
);
132 Item
*&p_ref_ (ib
? break_item_
137 p_ref_
= make_item ("SeparationItem", SCM_EOL
);
141 p_ref_
->set_property ("breakable", SCM_BOOL_T
);
142 context ()->set_property ("breakableSeparationItem", p_ref_
->self_scm ());
146 if (to_boolean (get_property ("createSpacing"))
147 && p_ref_
== break_item_
)
149 Item
*it
= make_item ("StaffSpacing", SCM_EOL
);
150 current_spacings_
.staff_spacing_
= it
;
151 it
->set_property ("left-items", scm_cons (break_item_
->self_scm (), SCM_EOL
));
155 if (int i
= last_spacings_
.note_spacings_
.size ())
158 Pointer_group_interface::add_grob (last_spacings_
.note_spacings_
[i
],
159 ly_symbol2scm ("right-items"),
163 else if (last_spacings_
.staff_spacing_
)
165 last_spacings_
.staff_spacing_
->set_property ("right-items",
166 scm_cons (break_item_
->self_scm (), SCM_EOL
));
171 if (Accidental_placement::has_interface (it
))
172 Separation_item::add_conditional_item (p_ref_
, it
);
174 Separation_item::add_item (p_ref_
,it
);
178 Separating_line_group_engraver::start_translation_timestep ()
181 context ()->unset_property (ly_symbol2scm ("breakableSeparationItem"));
186 Separating_line_group_engraver::stop_translation_timestep ()
190 Separating_group_spanner::add_spacing_unit (sep_span_
, break_item_
);
193 if (Item
* sp
= current_spacings_
.staff_spacing_
)
196 TODO: should really look at the left-items of following
200 Pointer_group_interface::add_grob (sp
, ly_symbol2scm ("right-items"),
206 if (!current_spacings_
.is_empty ())
208 last_spacings_
= current_spacings_
;
211 current_spacings_
.clear ();
215 Separating_group_spanner::add_spacing_unit (sep_span_
, musical_item_
);
222 ENTER_DESCRIPTION (Separating_line_group_engraver
,
223 /* descr */ "Generates objects for computing spacing parameters.",
224 /* creats*/ "SeparationItem SeparatingGroupSpanner StaffSpacing",
226 /* acks */ "item-interface",
227 /* reads */ "createSpacing",
228 /* write */ "breakableSeparationItem");