2 bar-number-engraver.cc -- implement Bar_number_engraver
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--2005 Han-Wen Nienhuys <hanwen@xs4all.nl>
9 #include "paper-column.hh"
10 #include "output-def.hh"
11 #include "side-position-interface.hh"
12 #include "engraver.hh"
14 #include "grob-array.hh"
16 #include "translator.icc"
19 TODO: detect the top staff (stavesFound), and acknowledge staff-group
20 system-start-delims. If we find these, and the top staff is in the
21 staff-group, add padding to the bar number.
24 class Bar_number_engraver : public Engraver
29 void stop_translation_timestep ();
30 DECLARE_ACKNOWLEDGER (break_aligned);
31 void process_music ();
33 TRANSLATOR_DECLARATIONS (Bar_number_engraver);
37 Bar_number_engraver::process_music ()
39 // todo include (&&!time->cadenza_b_)
41 SCM wb = get_property ("whichBar");
43 if (scm_is_string (wb))
45 Moment mp (robust_scm2moment (get_property ("measurePosition"), Moment (0)));
46 if (mp.main_part_ == Rational (0))
48 SCM bn = get_property ("currentBarNumber");
49 SCM proc = get_property ("barNumberVisibility");
50 if (scm_is_number (bn) && ly_is_procedure (proc)
51 && to_boolean (scm_call_1 (proc, bn)))
56 ("text", scm_number_to_string (bn, scm_from_int (10)));
62 Bar_number_engraver::Bar_number_engraver ()
68 Bar_number_engraver::acknowledge_break_aligned (Grob_info inf)
70 Grob *s = inf.grob ();
72 && dynamic_cast<Item *> (s)
73 && s->get_property ("break-align-symbol") == ly_symbol2scm ("left-edge"))
76 By default this would land on the Paper_column -- so why
77 doesn't it work when you leave this out? */
78 text_->set_parent (s, X_AXIS);
83 Bar_number_engraver::stop_translation_timestep ()
87 text_->set_object ("side-support-elements",
88 grob_list_to_grob_array (get_property ("stavesFound")));
94 Bar_number_engraver::create_items ()
99 text_ = make_item ("BarNumber", SCM_EOL);
102 ADD_TRANSLATOR (Bar_number_engraver,
103 /* doc */ "A bar number is created whenever measurePosition "
104 "is zero and there is a bar line. It is \n"
105 "put on top of all staves, and appears only at left side of the staff. "
106 "The staves are taken from @code{stavesFound}, which is maintained by "
107 "@code{@ref{Staff_collecting_engraver}}. ",
109 /* create */ "BarNumber",
115 "barNumberVisibility",