2003 -> 2004

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

diff --git a/lily/bar-engraver.cc b/lily/bar-engraver.cc
index 456a13cf400387bb7dcc3d82481482b75b3128f7..f3b94b25329305ae2334db40a495c8ca7b748cb6 100644 (file)
--- a/lily/bar-engraver.cc
+++ b/lily/bar-engraver.cc
@@ -1,123 +1,118 @@
 /*
-  bar-reg.cc -- implement Bar_engraver
+  bar-engraver.cc -- implement Bar_engraver
 
   source file of the GNU LilyPond music typesetter
 
-  (c)  1997--1998 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+  (c) 1997--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+  Jan Nieuwenhuizen <janneke@gnu.org>
 */
 
-#include "bar-engraver.hh"
-#include "bar.hh"
-#include "musical-request.hh"
-#include "multi-measure-rest.hh"
-#include "command-request.hh"
-#include "time-description.hh"
-#include "engraver-group.hh"
+#include "bar-line.hh"
+#include "score-engraver.hh"
+#include "event.hh"
+#include "engraver-group-engraver.hh"
+#include "warn.hh"
+#include "item.hh"
+#include "engraver.hh"
 
-Bar_engraver::Bar_engraver()
-{
-  bar_p_ =0;
-  do_post_move_processing();
-}
+/*
+  generate bars. Either user ("|:"), or default (new measure)
 
-bool
-Bar_engraver::do_try_request (Request*r_l)
+  */
+class Bar_engraver : public Engraver
 {
-  if (Bar_req  * b= dynamic_cast <Bar_req *> (r_l))
-    {
-      if (bar_req_l_ && bar_req_l_->equal_b (b)) // huh?
-       return false;
-      
-      bar_req_l_ = b;
-
-      return true;
-    }
-  
-  return false;
-
+public:
+  TRANSLATOR_DECLARATIONS(  Bar_engraver );
+  void request_bar (String type_string);
+    
+protected:
+  virtual void finalize ();
+  virtual void stop_translation_timestep ();
+  virtual void process_acknowledged_grobs ();
+
+private:
+  void typeset_bar ();
+  void create_bar ();
+
+  Item * bar_;
+};
+
+Bar_engraver::Bar_engraver ()
+{
+  bar_ =0;
 }
 
 void
 Bar_engraver::create_bar ()
 {
-  if (!bar_p_)
+  if (!bar_)
     {
-      bar_p_ = new Bar;
-      bar_p_->break_priority_i_  = 0;
-      String default_type = get_property ("defaultBarType");
-      if (default_type.length_i ())
-       {
-         bar_p_->type_str_ = default_type;
-       }
-      announce_element (Score_element_info (bar_p_, bar_req_l_));
+      bar_ = make_item ("BarLine");
+      SCM gl = get_property ("whichBar");
+      if (scm_equal_p (gl, bar_->get_grob_property ("glyph")) != SCM_BOOL_T)
+         bar_->set_grob_property ("glyph", gl);
+      
+      announce_grob(bar_, SCM_EOL);
     }
 }
 
-
-void 
-Bar_engraver::do_creation_processing ()
+void
+Bar_engraver::finalize ()
 {
-  create_bar ();
-  bar_p_->type_str_ = "";
+  typeset_bar ();
 }
 
+/*
+  Bar_engraver should come *after* any engravers that  
+  modify whichBar
+
+  This is a little hairy : whichBar may be set by
+  Repeat_acknowledge_engraver::process_music, which is at score
+  context. This means that grobs could should be created after
+  process_music. We do stuff process_acknowledged_grobs(), just to be
+  on the safe side.
+     
+*/
+
 void
-Bar_engraver::do_removal_processing ()
+Bar_engraver::process_acknowledged_grobs ()
 {
-  if (bar_p_) 
+  if (!bar_ && gh_string_p (get_property ("whichBar")))
     {
-      typeset_element (bar_p_);
-      bar_p_ =0;
+      create_bar ();
     }
 }
 
 void
-Bar_engraver::do_process_requests()
-{  
-  if (bar_req_l_) 
-    {
-      if (!bar_p_)
-       create_bar ();    
-
-      bar_p_->type_str_ = bar_req_l_->type_str_;
-    }
-  else 
-    {
-      Time_description const *time = get_staff_info().time_C_;
-      String always = get_property ("barAlways");
-      if ((time && !time->whole_in_measure_) || always.length_i ()) 
-       create_bar ();
-    }
-
-  
-  
-  if (!bar_p_)
+Bar_engraver::typeset_bar ()
+{
+  if (bar_) 
     {
-      Break_req r;
-      r.penalty_i_ = Break_req::DISALLOW;
-      daddy_grav_l ()->try_request (&r);
+      typeset_grob (bar_);
+      bar_ =0;
     }
 }
 
-
+/*
+  lines may only be broken if there is a barline in all staves 
+*/
 void 
-Bar_engraver::do_pre_move_processing()
+Bar_engraver::stop_translation_timestep ()
 {
-  if (bar_p_) 
+  if (!bar_)
     {
-      typeset_element (bar_p_);
-      bar_p_ =0;
+      top_engraver ()->forbid_breaks ();       // guh. Use properties!
     }
+  else
+    typeset_bar ();
 }
 
-void
-Bar_engraver::do_post_move_processing()
-{
-  bar_req_l_ = 0;
-}
-
-
-IMPLEMENT_IS_TYPE_B1(Bar_engraver,Engraver);
-ADD_THIS_TRANSLATOR(Bar_engraver);
-
 
+ENTER_DESCRIPTION(Bar_engraver,
+/* descr */       "Create barlines. This engraver is controlled through the "
+"@code{whichBar} property. If it has no bar line to create, it will forbid a linebreak at this point",
+/* creats*/       "BarLine",
+/* accepts */     "",
+/* acks  */      "",
+/* reads */       "whichBar",
+/* write */       "");