/*
- 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--2003 Han-Wen Nienhuys <hanwen@cs.uu.nl>
*/
-#include "time-signature-engraver.hh"
#include "time-signature.hh"
-#include "command-request.hh"
-#include "timing-engraver.hh"
+#include "warn.hh"
+
+#include "engraver.hh"
#include "engraver-group-engraver.hh"
+#include "misc.hh"
+
+/**
+ generate time_signatures.
+ */
+class Time_signature_engraver : public Engraver
+{
+ Item * time_signature_;
+ SCM last_time_fraction_;
+
+protected:
+ virtual void stop_translation_timestep ();
+ virtual void process_music ();
+public:
+ TRANSLATOR_DECLARATIONS(Time_signature_engraver);
+};
-Time_signature_engraver::Time_signature_engraver()
+
+Time_signature_engraver::Time_signature_engraver ()
{
- time_signature_p_ =0;
+ time_signature_ =0;
+ last_time_fraction_ = SCM_BOOL_F;
}
void
-Time_signature_engraver::do_process_requests()
+Time_signature_engraver::process_music ()
{
- Translator * result =
- daddy_grav_l()->get_simple_translator ("Timing_engraver"); // ugh
-
- if (!result)
+ /*
+ 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
+ && gh_pair_p (fr))
{
- 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);
- }
+ int den = gh_scm2int (gh_cdr (fr));
+ if (den != (1 << intlog2 (den)))
+ {
+ /*
+ Todo: should make typecheck?
+ OTOH, Tristan Keuris writes 8/20 in his Intermezzi.
+ */
+ warning (_f("Found strange time signature %d/%d.",
+ den,
+ gh_scm2int (gh_car (fr))
+ ));
+ }
- if (time_signature_p_)
- announce_element (Score_element_info (time_signature_p_, req));
+
+ last_time_fraction_ = fr;
+ time_signature_ = new Item (get_property ("TimeSignature"));
+ time_signature_->set_grob_property ("fraction",fr);
+
+ if (time_signature_)
+ announce_grob(time_signature_, SCM_EOL);
+ }
}
void
-Time_signature_engraver::do_pre_move_processing()
+Time_signature_engraver::stop_translation_timestep ()
{
- if (time_signature_p_)
+ if (time_signature_)
{
- typeset_element (time_signature_p_);
- time_signature_p_ =0;
+ typeset_grob (time_signature_);
+ time_signature_ =0;
}
}
-
-
-ADD_THIS_TRANSLATOR(Time_signature_engraver);
+ENTER_DESCRIPTION(Time_signature_engraver,
+/* descr */ "Create a TimeSignature whenever @code{timeSignatureFraction} changes",
+/* creats*/ "TimeSignature",
+/* accepts */ "",
+/* acks */ "",
+/* reads */ "",
+/* write */ "");