2 time_signature-reg.cc -- implement Time_signature_engraver
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--2001 Han-Wen Nienhuys <hanwen@cs.uu.nl>
9 #include "time-signature.hh"
10 #include "command-request.hh"
11 #include "engraver.hh"
14 #include "engraver-group-engraver.hh"
18 generate time_signatures.
20 class Time_signature_engraver : public Engraver
22 Item * time_signature_p_;
23 SCM last_time_fraction_;
26 virtual void stop_translation_timestep ();
27 virtual void create_grobs ();
29 TRANSLATOR_DECLARATIONS(Time_signature_engraver);
34 Time_signature_engraver::Time_signature_engraver ()
37 last_time_fraction_ = SCM_BOOL_F;
41 Time_signature_engraver::create_grobs ()
44 not rigorously safe, since the value might get GC'd and
45 reallocated in the same spot */
46 SCM fr= get_property ("timeSignatureFraction");
47 if (!time_signature_p_ && last_time_fraction_ != fr)
49 last_time_fraction_ = fr;
50 time_signature_p_ = new Item (get_property ("TimeSignature"));
51 time_signature_p_->set_grob_property ("fraction",fr);
53 if (time_signature_p_)
54 announce_grob (time_signature_p_, 0);
62 Time_signature_engraver::stop_translation_timestep ()
64 if (time_signature_p_)
66 typeset_grob (time_signature_p_);
75 ENTER_DESCRIPTION(Time_signature_engraver,
76 /* descr */ "Create a TimeSignature whenever @code{timeSignatureFraction} changes",
77 /* creats*/ "TimeSignature",