* VERSION (MY_PATCH_LEVEL): make 1.7.0

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

diff --git a/lily/bar-number-engraver.cc b/lily/bar-number-engraver.cc
index 2db31f2b918ab1cc9fcc044a936fc088efc14647..10eb2f45513e9ccc316c0c4948488264d01b4aea 100644 (file)
--- a/lily/bar-number-engraver.cc
+++ b/lily/bar-number-engraver.cc
@@ -1,39 +1,123 @@
 /*
-  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--2002 Han-Wen Nienhuys <hanwen@cs.uu.nl>
 */
 
 
-#include "bar-number-engraver.hh"
-#include "time-description.hh"
-#include "timing-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";
-  visibility_lambda_
-    = ly_ch_C_eval_scm ("postbreak_only_visibility");
+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 (gh_string_p (wb))
+    {
+      SCM smp = get_property ("measurePosition");
+      
+      Moment mp = (unsmob_moment (smp)) ? *unsmob_moment (smp) : Moment (0);
+      if (mp.main_part_ == Rational (0))
+       {
+         SCM bn = get_property ("currentBarNumber");
+         SCM proc = get_property ("barNumberVisibility");
+         if (gh_number_p (bn) && to_boolean(gh_call1(proc, bn)))
+           {
+             create_items ();
+             // guh.
+             text_->set_grob_property
+               ("text", scm_makfrom0str (to_string (gh_scm2int (bn)).to_str0 ()));
+           }
+       }
+    }
+
 }
 
+
+
+Bar_number_engraver::Bar_number_engraver ()
+{
+  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 *timer = dynamic_cast<Timing_translator*>(tr);
-  Time_description *time = &timer->time_;
+  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);
+    }
+}
 
-  if (!time->whole_in_measure_ && !time->cadenza_b_ && 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_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 */       "");