2 bar-number-engraver.cc -- implement Bar_number_engraver
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>
9 #include "paper-column.hh"
10 #include "output-def.hh"
11 #include "side-position-interface.hh"
12 #include "engraver.hh"
17 TODO: detect the top staff (stavesFound), and acknowledge staff-group
18 system-start-delims. If we find these, and the top staff is in the
19 staff-group, add padding to the bar number.
24 class Bar_number_engraver : public Engraver
29 virtual void stop_translation_timestep ();
30 virtual void acknowledge_grob (Grob_info);
31 virtual void process_music ();
33 TRANSLATOR_DECLARATIONS (Bar_number_engraver );
38 Bar_number_engraver::process_music ()
40 // todo include (&&!time->cadenza_b_)
42 SCM wb = get_property ("whichBar");
44 if (scm_is_string (wb))
46 Moment mp (robust_scm2moment (get_property ("measurePosition"),Moment (0)));
47 if (mp.main_part_ == Rational (0))
49 SCM bn = get_property ("currentBarNumber");
50 SCM proc = get_property ("barNumberVisibility");
51 if (scm_is_number (bn) && ly_c_procedure_p (proc)
52 && to_boolean (scm_call_1(proc, bn)))
57 ("text", scm_makfrom0str (to_string (scm_to_int (bn)).to_str0 ()));
66 Bar_number_engraver::Bar_number_engraver ()
73 Bar_number_engraver::acknowledge_grob (Grob_info inf)
77 && dynamic_cast<Item*> (s)
78 && s->get_property ("break-align-symbol") == ly_symbol2scm ("left-edge"))
81 By default this would land on the Paper_column -- so why
82 doesn't it work when you leave this out? */
83 text_->set_parent (s, X_AXIS);
88 Bar_number_engraver::stop_translation_timestep ()
92 text_->set_property ("side-support-elements", get_property ("stavesFound"));
100 Bar_number_engraver::create_items ()
105 text_ = make_item ("BarNumber", SCM_EOL);
106 Side_position_interface::set_axis (text_,Y_AXIS);
109 ENTER_DESCRIPTION (Bar_number_engraver,
110 /* descr */ "A bar number is created whenever measurePosition is zero. It is\n"
111 "put on top of all staves, and appears only at left side of the staff. "
112 "The staves are taken from @code{stavesFound}, which is maintained by "
113 "@code{@ref{Staff_collecting_engraver}}. "
116 /* creats*/ "BarNumber",
118 /* acks */ "break-aligned-interface",
119 /* reads */ "currentBarNumber stavesFound barNumberVisibility" ,