/*
- time_signature-reg.cc -- implement Time_signature_engraver
+ time-signature-engraver.cc -- implement Time_signature_engraver
source file of the GNU LilyPond music typesetter
- (c) 1997--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+ (c) 1997--2008 Han-Wen Nienhuys <hanwen@xs4all.nl>
*/
-#include "time-signature.hh"
-#include "command-request.hh"
-#include "engraver.hh"
-
-
-#include "engraver-group-engraver.hh"
+#include "engraver-group.hh"
+#include "item.hh"
+#include "international.hh"
+#include "misc.hh"
+#include "time-signature.hh"
+#include "warn.hh"
/**
- generate time_signatures.
- */
-class Time_signature_engraver : public Engraver {
+ generate time_signatures.
+*/
+class Time_signature_engraver : public Engraver
+{
+ Item *time_signature_;
+ SCM last_time_fraction_;
+
protected:
- void deprecated_process_music();
- virtual void do_pre_move_processing();
+ virtual void derived_mark () const;
+ void stop_translation_timestep ();
+ void process_music ();
public:
- VIRTUAL_COPY_CONS(Translator);
- Item * time_signature_p_;
- SCM last_time_fraction_;
- Time_signature_engraver();
+ TRANSLATOR_DECLARATIONS (Time_signature_engraver);
};
+void
+Time_signature_engraver::derived_mark () const
+{
+ scm_gc_mark (last_time_fraction_);
+}
-Time_signature_engraver::Time_signature_engraver()
-{
- time_signature_p_ =0;
- last_time_fraction_ = SCM_EOL;
+Time_signature_engraver::Time_signature_engraver ()
+{
+ time_signature_ = 0;
+ last_time_fraction_ = SCM_BOOL_F;
}
void
-Time_signature_engraver::deprecated_process_music()
+Time_signature_engraver::process_music ()
{
/*
not rigorously safe, since the value might get GC'd and
reallocated in the same spot */
- SCM fr= get_property ("timeSignatureFraction");
- if (last_time_fraction_ != fr)
+ SCM fr = get_property ("timeSignatureFraction");
+ if (!time_signature_
+ && last_time_fraction_ != fr
+ && scm_is_pair (fr))
{
- last_time_fraction_ = fr;
- time_signature_p_ = new Item (get_property ("TimeSignature"));
- time_signature_p_->set_elt_property ("fraction",fr);
+ int den = scm_to_int (scm_cdr (fr));
+ if (den != (1 << intlog2 (den)))
+ {
+ /*
+ Todo: should make typecheck?
+
+ OTOH, Tristan Keuris writes 8/20 in his Intermezzi.
+ */
+ warning (_f ("strange time signature found: %d/%d",
+ int (scm_to_int (scm_car (fr))),
+ den));
+ }
+
+ time_signature_ = make_item ("TimeSignature", SCM_EOL);
+ time_signature_->set_property ("fraction", fr);
+
+ if (last_time_fraction_ == SCM_BOOL_F)
+ time_signature_->set_property ("break-visibility",
+ get_property ("implicitTimeSignatureVisibility"));
+
+ last_time_fraction_ = fr;
}
-
- if (time_signature_p_)
- announce_element (time_signature_p_, 0);
}
void
-Time_signature_engraver::do_pre_move_processing()
+Time_signature_engraver::stop_translation_timestep ()
{
- if (time_signature_p_)
- {
- typeset_element (time_signature_p_);
- time_signature_p_ =0;
- }
+ time_signature_ = 0;
}
+#include "translator.icc"
+
+ADD_TRANSLATOR (Time_signature_engraver,
+ /* doc */
+ "Create a @ref{TimeSignature} whenever"
+ " @code{timeSignatureFraction} changes.",
-ADD_THIS_TRANSLATOR(Time_signature_engraver);
-
+ /* create */
+ "TimeSignature ",
+
+ /* read */
+ "implicitTimeSignatureVisibility "
+ "timeSignatureFraction ",
+ /* write */
+ ""
+ );