/*
- bar-number-grav.cc -- implement Bar_number_engraver
+ bar-number-engraver.cc -- implement Bar_number_engraver
source file of the GNU LilyPond music typesetter
- (c) 1997--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+ (c) 1997--2002 Han-Wen Nienhuys <hanwen@cs.uu.nl>
*/
-#include "bar-number-engraver.hh"
-#include "engraver-group-engraver.hh"
-#include "text-item.hh"
+
+#include "lily-guile.hh"
+#include "paper-column.hh"
+#include "paper-def.hh"
+#include "side-position-interface.hh"
+#include "item.hh"
#include "moment.hh"
+#include "engraver.hh"
+#include "translator-group.hh"
-Bar_number_engraver::Bar_number_engraver()
+/*
+
+TODO: detect the top staff (stavesFound), and acknowledge staff-group
+system-start-delims. If we find these, and the top staff is in the
+staff-group, add padding to the bar number.
+
+*/
+
+
+class Bar_number_engraver : public Engraver
{
- axis_ = Y_AXIS;
- type_ = "barNumber";
-}
+protected:
+ Item* text_;
+protected:
+ virtual void stop_translation_timestep ();
+ virtual void acknowledge_grob (Grob_info);
+ virtual void process_music ();
+ void create_items ();
+ TRANSLATOR_DECLARATIONS( Bar_number_engraver );
+};
+/*
+ TODO: more advanced formatting via SCM function, perhaps barnumbers
+ every 5 measures? */
void
-Bar_number_engraver::do_process_music ()
+Bar_number_engraver::process_music ()
{
- // todo include (&&!time->cadenza_b_ )
- SCM bn = get_property("currentBarNumber");
- SCM smp = get_property ("measurePosition");
- Moment mp = (unsmob_moment (smp)) ? *unsmob_moment (smp) : Moment (0);
+ // todo include (&&!time->cadenza_b_)
+
+ SCM wb = get_property ("whichBar");
- if (gh_number_p (bn) &&
- !mp && now_mom () > Moment (0))
+ if (gh_string_p (wb))
{
- create_items (0);
+ SCM bn = get_property ("currentBarNumber");
+ SCM smp = get_property ("measurePosition");
+ int ibn = gh_number_p (bn) ? gh_scm2int(bn) : 1;
+
+ Moment mp = (unsmob_moment (smp)) ? *unsmob_moment (smp) : Moment (0);
+ if (mp.main_part_ == Rational (0)
+ && ibn != 1)
+ {
+ create_items ();
+
+ // guh.
+ text_->set_grob_property ("text",
+ ly_str02scm (to_string (gh_scm2int (bn)).to_str0 ()));
+ }
+ }
+
+}
- // guh.
- text_p_->set_elt_property ("text",
- ly_str02scm (to_str (gh_scm2int (bn)).ch_C()));
-
+
+
+Bar_number_engraver::Bar_number_engraver ()
+{
+ text_ =0;
+}
+
+
+void
+Bar_number_engraver::acknowledge_grob (Grob_info inf)
+{
+ Grob * s = inf.grob_;
+ if (text_
+ && dynamic_cast<Item*> (s)
+ && s->get_grob_property ("break-align-symbol") == ly_symbol2scm ("left-edge"))
+ {
+ /*
+ By default this would land on the Paper_column -- so why
+ doesn't it work when you leave this out? */
+ text_->set_parent (s, X_AXIS);
+ }
+}
+
+void
+Bar_number_engraver::stop_translation_timestep ()
+{
+ if (text_)
+ {
+ text_->set_grob_property ("side-support-elements", get_property ("stavesFound"));
+ typeset_grob (text_);
+ text_ =0;
}
}
-ADD_THIS_TRANSLATOR(Bar_number_engraver);
+
+void
+Bar_number_engraver::create_items ()
+{
+ if (text_)
+ return;
+
+ SCM b = get_property ("BarNumber");
+ text_ = new Item (b);
+ Side_position_interface::set_axis (text_,Y_AXIS);
+
+ announce_grob(text_, SCM_EOL);
+}
+
+ENTER_DESCRIPTION(Bar_number_engraver,
+/* descr */ "A bar number is created whenever measurePosition is zero. It is
+put on top of all staves, and appears only at left side of the staff.",
+/* creats*/ "BarNumber",
+/* acks */ "break-aligned-interface",
+/* reads */ "currentBarNumber stavesFound" ,
+/* write */ "");