release: 1.5.37

[lilypond.git] / lily / bar-number-engraver.cc

diff --git a/lily/bar-number-engraver.cc b/lily/bar-number-engraver.cc
index 7adc8dcdea11546bd76121830c06bfdba24698e5..5d6373392fb014ef4d325d96d4ba63f030b1c8ec 100644 (file)
--- a/lily/bar-number-engraver.cc
+++ b/lily/bar-number-engraver.cc
@@ -3,38 +3,116 @@
 
   source file of the GNU LilyPond music typesetter
 
-  (c)  1997--1998 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+  (c)  1997--2002 Han-Wen Nienhuys <hanwen@cs.uu.nl>
 */
 
 
-#include "bar-number-engraver.hh"
-#include "time-description.hh"
-#include "timing-engraver.hh"
-#include "engraver-group.hh"
-#include "g-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()
+
+class Bar_number_engraver : public Engraver
+{
+protected:
+  Item* text_p_;
+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::process_music ()
 {
-  axis_ = Y_AXIS;
-  type_ = "barNumber";
-  visibility_lambda_
-    = gh_eval_str ("(lambda (d) (if (= d 1) '(#f . #f) '(#t . #t)))");
+  // todo include (&&!time->cadenza_b_)
+
+  SCM wb = get_property ("whichBar");
+  
+  if (gh_string_p (wb))
+    {
+      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_p_->set_grob_property ("text",
+                                     ly_str02scm (to_str (gh_scm2int (bn)).ch_C ()));
+       }
+    }
+
 }
 
+
+
+Bar_number_engraver::Bar_number_engraver ()
+{
+  text_p_ =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 *timer = dynamic_cast<Timing_translator*>(tr);
-  Time_description *time = &timer->time_;
+  Grob * s = inf.grob_l_;
+  if (text_p_
+      && 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_p_->set_parent (s, X_AXIS);
+    }
+}
 
-  if (!time->whole_in_measure_ && !time->cadenza_b_ && now_moment () > Moment (0))
+void 
+Bar_number_engraver::stop_translation_timestep ()
+{
+  if (text_p_)
     {
-      create_items (0);
-       
-      text_p_->text_str_ = to_str (time->bars_i_);
-      text_p_->style_str_ = "roman";
+      text_p_->set_grob_property ("side-support-elements", get_property ("stavesFound"));
+      typeset_grob (text_p_);
+      text_p_ =0;
     }
 }
 
-ADD_THIS_TRANSLATOR(Bar_number_engraver);
+
+void
+Bar_number_engraver::create_items ()
+{
+  if (text_p_)
+    return;
+
+  SCM b = get_property ("BarNumber");
+  text_p_ = new Item (b);
+  Side_position_interface::set_axis (text_p_,Y_AXIS);
+
+  announce_grob(text_p_, 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 */       "");