2 bar-number-engraver.cc -- implement Bar_number_engraver
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--2002 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"
17 #include "translator-group.hh"
21 TODO: detect the top staff (staffsFound), 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 TODO: more advanced formatting via SCM function, perhaps barnumbers
46 Bar_number_engraver::process_music ()
48 // todo include (&&!time->cadenza_b_)
50 SCM wb = get_property ("whichBar");
54 SCM bn = get_property ("currentBarNumber");
55 SCM smp = get_property ("measurePosition");
56 int ibn = gh_number_p (bn) ? gh_scm2int(bn) : 1;
58 Moment mp = (unsmob_moment (smp)) ? *unsmob_moment (smp) : Moment (0);
59 if (mp.main_part_ == Rational (0)
65 text_p_->set_grob_property ("text",
66 ly_str02scm (to_str (gh_scm2int (bn)).ch_C ()));
74 Bar_number_engraver::Bar_number_engraver ()
81 Bar_number_engraver::acknowledge_grob (Grob_info inf)
83 Grob * s = inf.grob_l_;
85 && dynamic_cast<Item*> (s)
86 && s->get_grob_property ("break-align-symbol") == ly_symbol2scm ("left-edge"))
89 By default this would land on the Paper_column -- so why
90 doesn't it work when you leave this out? */
91 text_p_->set_parent (s, X_AXIS);
96 Bar_number_engraver::stop_translation_timestep ()
100 text_p_->set_grob_property ("side-support-elements", get_property ("stavesFound"));
101 typeset_grob (text_p_);
108 Bar_number_engraver::create_items ()
113 SCM b = get_property ("BarNumber");
114 text_p_ = new Item (b);
115 Side_position_interface::set_axis (text_p_,Y_AXIS);
117 announce_grob(text_p_, SCM_EOL);
120 ENTER_DESCRIPTION(Bar_number_engraver,
121 /* descr */ "A bar number is created whenever measurePosition is zero. It is
122 put on top of all staves, and appears only at left side of the staff.",
123 /* creats*/ "BarNumber",
124 /* acks */ "break-aligned-interface",
125 /* reads */ "currentBarNumber stavesFound" ,