/*
- 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--2002 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+ (c) 1997--2007 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.
- */
+ generate time_signatures.
+*/
class Time_signature_engraver : public Engraver
{
- Item * time_signature_p_;
+ Item *time_signature_;
SCM last_time_fraction_;
protected:
- virtual void stop_translation_timestep ();
- virtual void create_grobs ();
+ virtual void derived_mark () const;
+ void stop_translation_timestep ();
+ void process_music ();
public:
- TRANSLATOR_DECLARATIONS(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;
+{
+ time_signature_ = 0;
last_time_fraction_ = SCM_BOOL_F;
}
void
-Time_signature_engraver::create_grobs ()
+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 (!time_signature_p_ && 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_grob_property ("fraction",fr);
-
- if (time_signature_p_)
- announce_grob (time_signature_p_, 0);
+ 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",
+ den,
+ int (scm_to_int (scm_car (fr)))));
+ }
+
+ 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;
}
-
}
-
-
void
Time_signature_engraver::stop_translation_timestep ()
{
- if (time_signature_p_)
- {
- typeset_grob (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",
+ /* create */
+ "TimeSignature ",
+
+ /* read */
+ "implicitTimeSignatureVisibility "
+ "timeSignatureFraction "
-
-
-ENTER_DESCRIPTION(Time_signature_engraver,
-/* descr */ "Create a TimeSignature whenever @code{timeSignatureFraction} changes",
-/* creats*/ "TimeSignature",
-/* acks */ "",
-/* reads */ "",
-/* write */ "");
+ ,
+ /* write */ "");