2003 -> 2004

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

diff --git a/lily/bar-engraver.cc b/lily/bar-engraver.cc
index 075cd5612931060c8b237870a0aff52b9cdc6b2e..f3b94b25329305ae2334db40a495c8ca7b748cb6 100644 (file)
--- a/lily/bar-engraver.cc
+++ b/lily/bar-engraver.cc
@@ -3,137 +3,116 @@
 
   source file of the GNU LilyPond music typesetter
 
-  (c)  1997--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+  (c) 1997--2004 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   Jan Nieuwenhuizen <janneke@gnu.org>
 */
 
+#include "bar-line.hh"
 #include "score-engraver.hh"
-#include "bar-engraver.hh"
-#include "staff-bar.hh"
-#include "musical-request.hh"
-#include "multi-measure-rest.hh"
-#include "command-request.hh"
-#include "timing-engraver.hh"
+#include "event.hh"
 #include "engraver-group-engraver.hh"
 #include "warn.hh"
+#include "item.hh"
+#include "engraver.hh"
 
-Bar_engraver::Bar_engraver()
+/*
+  generate bars. Either user ("|:"), or default (new measure)
+
+  */
+class Bar_engraver : public Engraver
 {
-  bar_p_ =0;
-  do_post_move_processing();
+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 Staff_bar (get_property ("basicBarlineProperties"));
-
+      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);
       
-      // urg: "" != empty...
-      /*
-       TODO: use symbol.
-       */
-      SCM default_type = get_property ("defaultBarType");
-      if (gh_string_p (default_type))
-       {
-         bar_p_->set_elt_property ("glyph", default_type); // ugh
-       }
-
-      announce_element (Score_element_info (bar_p_, 0));
+      announce_grob(bar_, SCM_EOL);
     }
 }
 
-/**
-   Make a barline.  If there are both |: and :| requested, merge them
-   to :|:.
-
-*/
 void
-Bar_engraver::request_bar (String requested_type)
+Bar_engraver::finalize ()
 {
-  if (!now_mom ())
-    {
-      SCM prop = get_property ("barAtLineStart");
-      if (!to_boolean (prop))
-       return;
-    }
-  bool  bar_existed = bar_p_;
-  create_bar ();
-  if (bar_existed && requested_type == "")
-    {
-      return;
-    }
-
-  String current = ly_scm2string (bar_p_->get_elt_property ("glyph"));
-  
-  if ((requested_type == "|:" && current== ":|")
-    || (requested_type == ":|" && current == "|:"))
-    requested_type = ":|:";
-
-  
-  bar_p_->set_elt_property ("glyph",
-                           ly_str02scm (requested_type.ch_C ()));
+  typeset_bar ();
 }
 
-void 
-Bar_engraver::do_creation_processing ()
-{
-}
+/*
+  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_music()
-{  
-  Translator * t = daddy_grav_l  ()->get_simple_translator ("Timing_engraver");
-
-  Timing_engraver * te = dynamic_cast<Timing_engraver*>(t);
-  String which = (te) ? te->which_bar () : "";
-
-  if (which.length_i ())
-    {
-      create_bar();
-      bar_p_->set_elt_property ("glyph",  ly_str02scm (which.ch_C ()));
-    }
-  
-  if (!bar_p_)
+Bar_engraver::typeset_bar ()
+{
+  if (bar_) 
     {
-      Score_engraver * e = 0;
-      Translator * t  =  daddy_grav_l ();
-      for (; !e && t;  t = t->daddy_trans_l_)
-       {
-         e = dynamic_cast<Score_engraver*> (t);
-       }
-      
-      if (!e)
-       programming_error ("No score engraver!");
-      else
-       e->forbid_breaks ();
+      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 ();
 }
 
-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 */       "");