2 volta-engraver.cc -- implement Volta_engraver
4 source file of the GNU LilyPond music typesetter
6 (c) 2000--2001 Han-Wen Nienhuys <hanwen@cs.uu.nl>
10 #include "engraver.hh"
11 #include "translator-group.hh"
12 #include "volta-spanner.hh"
14 #include "note-column.hh"
16 #include "side-position-interface.hh"
19 Create Volta spanners, by reading repeatCommands property, usually
20 set by Unfolded_repeat_iterator.
22 class Volta_engraver
: public Engraver
26 VIRTUAL_COPY_CONS (Translator
);
29 virtual void acknowledge_grob (Grob_info
);
30 virtual void finalize ();
31 virtual void stop_translation_timestep ();
32 virtual void process_music ();
33 virtual void create_grobs ();
36 Spanner
*volta_span_p_
;
37 Spanner
*end_volta_span_p_
;
42 ADD_THIS_TRANSLATOR (Volta_engraver
);
44 Volta_engraver::Volta_engraver ()
47 end_volta_span_p_
= 0;
52 Volta_engraver::process_music ()
54 SCM cs
= get_property ("repeatCommands");
58 while (gh_pair_p (cs
))
62 if (gh_pair_p (c
) && gh_car (c
) == ly_symbol2scm ("volta")
63 && gh_pair_p (gh_cdr (c
)))
65 if (gh_cadr (c
) == SCM_BOOL_F
)
68 start_str_
= gh_cadr (c
);
76 SCM
l (get_property ("voltaSpannerDuration"));
77 Moment now
= now_mom ();
79 bool early_stop
= unsmob_moment (l
)
80 && *unsmob_moment (l
) <= now
- started_mom_
;
82 end
= end
|| early_stop
;
86 if (end
&& !volta_span_p_
)
88 warning (_ ("No volta spanner to end")); // fixme: be more verbose.
92 end_volta_span_p_
= volta_span_p_
;
96 maybe do typeset_grob () directly?
99 if (!gh_string_p (start_str_
))
100 end_volta_span_p_
->set_grob_property ("last-volta", SCM_BOOL_T
);
103 if (gh_string_p (start_str_
) && volta_span_p_
)
105 warning (_ ("Already have a volta spanner. Stopping that one prematurely."));
107 if (end_volta_span_p_
)
109 warning (_ ("Also have a stopped spanner. Giving up."));
113 end_volta_span_p_
= volta_span_p_
;
119 this could just as well be done in process_music (), but what the hack.
122 Volta_engraver::create_grobs ()
124 if (!volta_span_p_
&& gh_string_p (start_str_
))
126 started_mom_
= now_mom () ;
128 volta_span_p_
= new Spanner (get_property ("VoltaBracket"));
129 Volta_spanner::set_interface (volta_span_p_
);
130 announce_grob (volta_span_p_
,0);
131 volta_span_p_
->set_grob_property ("text", start_str_
);
136 Volta_engraver::acknowledge_grob (Grob_info i
)
138 if (Item
* item
= dynamic_cast<Item
*> (i
.elem_l_
))
140 if (Note_column::has_interface (item
))
143 Volta_spanner::add_column (volta_span_p_
,item
);
144 if (end_volta_span_p_
)
145 Volta_spanner::add_column (end_volta_span_p_
,item
);
147 if (Bar::has_interface (item
))
150 Volta_spanner::add_bar (volta_span_p_
, item
);
151 if (end_volta_span_p_
)
152 Volta_spanner::add_bar (end_volta_span_p_
, item
);
158 Volta_engraver::finalize ()
162 typeset_grob (volta_span_p_
);
164 if (end_volta_span_p_
)
166 typeset_grob (end_volta_span_p_
);
173 Volta_engraver::stop_translation_timestep ()
175 if (end_volta_span_p_
)
177 Side_position_interface::add_staff_support (end_volta_span_p_
);
179 typeset_grob (end_volta_span_p_
);
180 end_volta_span_p_
=0;
185 TODO: should attach volta to paper-column if no bar is found.