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>
10 #include "lily-guile.hh"
11 #include "paper-column.hh"
12 #include "paper-def.hh"
13 #include "side-position-interface.hh"
16 #include "engraver.hh"
21 TODO: detect the top staff (stavesFound), and acknowledge staff-group
22 system-start-delims. If we find these, and the top staff is in the
23 staff-group, add padding to the bar number.
28 class Bar_number_engraver : public Engraver
33 virtual void stop_translation_timestep ();
34 virtual void acknowledge_grob (Grob_info);
35 virtual void process_music ();
37 TRANSLATOR_DECLARATIONS (Bar_number_engraver );
42 Bar_number_engraver::process_music ()
44 // todo include (&&!time->cadenza_b_)
46 SCM wb = get_property ("whichBar");
50 SCM smp = get_property ("measurePosition");
52 Moment mp = (unsmob_moment (smp)) ? *unsmob_moment (smp) : Moment (0);
53 if (mp.main_part_ == Rational (0))
55 SCM bn = get_property ("currentBarNumber");
56 SCM proc = get_property ("barNumberVisibility");
57 if (gh_number_p (bn) && gh_procedure_p (proc)
58 && to_boolean (gh_call1(proc, bn)))
63 ("text", scm_makfrom0str (to_string (gh_scm2int (bn)).to_str0 ()));
72 Bar_number_engraver::Bar_number_engraver ()
79 Bar_number_engraver::acknowledge_grob (Grob_info inf)
83 && dynamic_cast<Item*> (s)
84 && s->get_property ("break-align-symbol") == ly_symbol2scm ("left-edge"))
87 By default this would land on the Paper_column -- so why
88 doesn't it work when you leave this out? */
89 text_->set_parent (s, X_AXIS);
94 Bar_number_engraver::stop_translation_timestep ()
98 text_->set_property ("side-support-elements", get_property ("stavesFound"));
106 Bar_number_engraver::create_items ()
111 text_ = make_item ("BarNumber");
112 Side_position_interface::set_axis (text_,Y_AXIS);
114 announce_grob (text_, SCM_EOL);
117 ENTER_DESCRIPTION (Bar_number_engraver,
118 /* descr */ "A bar number is created whenever measurePosition is zero. It is\n"
119 "put on top of all staves, and appears only at left side of the staff.",
120 /* creats*/ "BarNumber",
122 /* acks */ "break-aligned-interface",
123 /* reads */ "currentBarNumber stavesFound barNumberVisibility" ,