/*
- 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-engraver.hh"
+#include "engraver-group.hh"
+
+#include "item.hh"
+#include "international.hh"
+#include "misc.hh"
#include "time-signature.hh"
-#include "command-request.hh"
-#include "timing-engraver.hh"
-#include "engraver-group-engraver.hh"
+#include "warn.hh"
-Time_signature_engraver::Time_signature_engraver()
-{
- time_signature_p_ =0;
-}
+/**
+ generate time_signatures.
+*/
+class Time_signature_engraver : public Engraver
+{
+ Item *time_signature_;
+ SCM last_time_fraction_;
+
+protected:
+ virtual void derived_mark () const;
+ void stop_translation_timestep ();
+ void process_music ();
+public:
+ TRANSLATOR_DECLARATIONS (Time_signature_engraver);
+};
void
-Time_signature_engraver::do_process_music()
+Time_signature_engraver::derived_mark () const
{
- Translator * result =
- daddy_grav_l()->get_simple_translator ("Timing_engraver"); // ugh
-
- if (!result)
- {
- warning (_ ("lost in time:"));
- warning (_f ("can't find: `%s'", " Timing_translator"));
- return ;
- }
-
- Timing_engraver * timing_grav_l= dynamic_cast<Timing_engraver *> (result);
-
- Time_signature_change_req *req = timing_grav_l->time_signature_req_l();
- if (req)
- {
- time_signature_p_ = new Time_signature;
- time_signature_p_->set_elt_property ("fraction",
- gh_cons (gh_int2scm (req->beats_i_),
- gh_int2scm (req->one_beat_i_)));
- time_signature_p_->set_elt_property ("break-aligned", SCM_BOOL_T);
- }
+ scm_gc_mark (last_time_fraction_);
+}
-
- if (time_signature_p_)
- announce_element (Score_element_info (time_signature_p_, req));
+Time_signature_engraver::Time_signature_engraver ()
+{
+ time_signature_ = 0;
+ last_time_fraction_ = SCM_BOOL_F;
}
void
-Time_signature_engraver::do_pre_move_processing()
+Time_signature_engraver::process_music ()
{
- if (time_signature_p_)
+ /*
+ not rigorously safe, since the value might get GC'd and
+ reallocated in the same spot */
+ SCM fr = get_property ("timeSignatureFraction");
+ if (!time_signature_
+ && last_time_fraction_ != fr
+ && scm_is_pair (fr))
{
- typeset_element (time_signature_p_);
- 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",
+ 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;
}
}
+void
+Time_signature_engraver::stop_translation_timestep ()
+{
+ 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 */
+ ""
+ );