/*
- 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--1999 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+ (c) 1997--2005 Han-Wen Nienhuys <hanwen@cs.uu.nl>
*/
+#include "paper-column.hh"
+#include "output-def.hh"
+#include "side-position-interface.hh"
+#include "engraver.hh"
+#include "context.hh"
-#include "bar-number-engraver.hh"
-#include "timing-translator.hh"
-#include "timing-engraver.hh"
-#include "engraver-group-engraver.hh"
-#include "text-item.hh"
+/*
+ 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
+{
+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);
+};
+
+void
+Bar_number_engraver::process_music ()
+{
+ // todo include (&&!time->cadenza_b_)
+
+ SCM wb = get_property ("whichBar");
+
+ if (scm_is_string (wb))
+ {
+ Moment mp (robust_scm2moment (get_property ("measurePosition"), Moment (0)));
+ if (mp.main_part_ == Rational (0))
+ {
+ SCM bn = get_property ("currentBarNumber");
+ SCM proc = get_property ("barNumberVisibility");
+ if (scm_is_number (bn) && ly_c_procedure_p (proc)
+ && to_boolean (scm_call_1 (proc, bn)))
+ {
+ create_items ();
+ // guh.
+ text_->set_property
+ ("text", scm_makfrom0str (to_string (scm_to_int (bn)).to_str0 ()));
+ }
+ }
+ }
+}
-Bar_number_engraver::Bar_number_engraver()
+Bar_number_engraver::Bar_number_engraver ()
{
- axis_ = Y_AXIS;
- type_ = "barNumber";
- visibility_lambda_
- = ly_ch_C_eval_scm ("postbreak-only-visibility");
+ text_ = 0;
}
void
-Bar_number_engraver::do_process_requests ()
+Bar_number_engraver::acknowledge_grob (Grob_info inf)
{
- Translator *tr = daddy_grav_l ()->get_simple_translator ("Timing_engraver");
- Timing_translator *time = dynamic_cast<Timing_translator*>(tr);
+ Grob *s = inf.grob_;
+ if (text_
+ && dynamic_cast<Item *> (s)
+ && s->get_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);
+ }
+}
- // todo include (&&!time->cadenza_b_ )
- if (!time->measure_position () && now_mom () > Moment (0))
+void
+Bar_number_engraver::stop_translation_timestep ()
+{
+ if (text_)
{
- create_items (0);
-
- text_p_->text_str_ = to_str (time->bars_i ());
+ text_->set_property ("side-support-elements", get_property ("stavesFound"));
+
+ text_ = 0;
}
}
-ADD_THIS_TRANSLATOR(Bar_number_engraver);
+void
+Bar_number_engraver::create_items ()
+{
+ if (text_)
+ return;
+
+ text_ = make_item ("BarNumber", SCM_EOL);
+ Side_position_interface::set_axis (text_, Y_AXIS);
+}
+
+ADD_TRANSLATOR (Bar_number_engraver,
+ /* descr */ "A bar number is created whenever measurePosition is zero. It is\n"
+ "put on top of all staves, and appears only at left side of the staff. "
+ "The staves are taken from @code{stavesFound}, which is maintained by "
+ "@code{@ref{Staff_collecting_engraver}}. ",
+
+ /* creats*/ "BarNumber",
+ /* accepts */ "",
+ /* acks */ "break-aligned-interface",
+ /* reads */ "currentBarNumber stavesFound barNumberVisibility",
+ /* write */ "");