2 timing-engraver.cc -- implement Default_bar_line_engraver
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--2005 Han-Wen Nienhuys <hanwen@cs.uu.nl>
11 #include "multi-measure-rest.hh"
15 class Default_bar_line_engraver : public Engraver
18 /* Need to know whether we're advancing in grace notes, or not. */
21 void start_translation_timestep ();
22 void stop_translation_timestep ();
25 TRANSLATOR_DECLARATIONS (Default_bar_line_engraver);
28 #include "translator.icc"
30 ADD_TRANSLATOR (Default_bar_line_engraver,
31 "This engraver determines what kind of automatic bar lines should be produced, "
32 "and sets @code{whichBar} accordingly. It should be at the same "
33 "level as @ref{Timing_translator}. ",
37 "measurePosition automaticBars whichBar barAlways defaultBarType "
39 /* write */ "automaticBars");
41 Default_bar_line_engraver::Default_bar_line_engraver ()
43 last_moment_.main_part_ = Rational (-1);
47 Default_bar_line_engraver::start_translation_timestep ()
49 SCM automatic_bars = get_property ("automaticBars");
50 Moment now = now_mom ();
51 SCM which = get_property ("whichBar");
53 /* Set the first bar of the score? */
54 if (!scm_is_string (which))
57 Moment mp = measure_position (context ());
58 bool start_of_measure = (last_moment_.main_part_ != now.main_part_
61 if (!scm_is_string (which) && to_boolean (automatic_bars))
63 SCM always = get_property ("barAlways");
65 if ((start_of_measure && last_moment_.main_part_ >= Moment (0))
66 || to_boolean (always))
68 /* should this work, or be junked? See input/bugs/no-bars.ly */
69 which = get_property ("defaultBarType");
73 context ()->set_property ("whichBar", which);
77 Default_bar_line_engraver::stop_translation_timestep ()
79 context ()->set_property ("whichBar", SCM_EOL);
80 last_moment_ = now_mom ();