Add cautionary-style to interface.

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

diff --git a/lily/span-bar-engraver.cc b/lily/span-bar-engraver.cc
index b77fb1bf1e15b66e476ef8496e11ce1af72ac1a4..c2c3fd919c78ddb5df8d193712779be0171d1aa3 100644 (file)
--- a/lily/span-bar-engraver.cc
+++ b/lily/span-bar-engraver.cc
@@ -1,23 +1,98 @@
 /*
-  span-bar-engraver.cc -- implement Span_bar_engraver
+  span-bar-grav.cc -- implement Span_bar_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 "base-span-bar-engraver.hh"
 
-class Span_bar_engraver : public Base_span_bar_engraver
+#include "lily-guile.hh"
+#include "bar-line.hh"
+#include "item.hh"
+#include "span-bar.hh"
+#include "engraver.hh"
+
+
+/** 
+
+  Make bars that span multiple "staves". Catch bars, and span a
+  Span_bar over them if we find more than 2 bars.  Vertical alignment
+  of staves changes the appearance of spanbars.  It is up to the
+  aligner (Vertical_align_engraver, in this case, to add extra
+  dependencies to the spanbars.
+
+  */
+class Span_bar_engraver : public Engraver
 {
+  Item * spanbar_p_;
+  Link_array<Item> bar_l_arr_;
+
 public:
-  Span_bar_engraver ();
-  VIRTUAL_COPY_CONS (Translator);
+  TRANSLATOR_DECLARATIONS(Span_bar_engraver);
+protected:
+  virtual void acknowledge_grob (Grob_info);
+  virtual void stop_translation_timestep ();
+
 };
 
-ADD_THIS_TRANSLATOR (Span_bar_engraver);
 
 Span_bar_engraver::Span_bar_engraver ()
 {
-  use_priority_b_ = false;
+  spanbar_p_ =0;
 }
+
+
+
+void
+Span_bar_engraver::acknowledge_grob (Grob_info i)
+{
+  int depth = i.origin_trans_l_arr (this).size ();
+  if (depth > 1
+      && Bar_line::has_interface (i.grob_l_))
+    {
+      Item * it = dynamic_cast<Item*> (i.grob_l_);
+      bar_l_arr_.push (it);
+
+      if (bar_l_arr_.size () >= 2 && !spanbar_p_) 
+       {
+         spanbar_p_ = new Item (get_property ("SpanBar"));
+
+         spanbar_p_->set_parent (bar_l_arr_[0], X_AXIS);
+
+         announce_grob (spanbar_p_, SCM_EOL);
+       }
+    }
+}
+void
+Span_bar_engraver::stop_translation_timestep ()
+{
+  if (spanbar_p_) 
+    {
+      for (int i=0; i < bar_l_arr_.size () ; i++)
+       Span_bar::add_bar (spanbar_p_,bar_l_arr_[i]);
+
+      SCM vissym =ly_symbol2scm ("visibility-lambda");
+      SCM vis = bar_l_arr_[0]->internal_get_grob_property (vissym);      
+      if (scm_equal_p (spanbar_p_->internal_get_grob_property (vissym), vis) != SCM_BOOL_T)
+       spanbar_p_->internal_set_grob_property (vissym, vis);
+
+      typeset_grob (spanbar_p_);
+      spanbar_p_ =0;
+    }
+  bar_l_arr_.set_size (0);
+}
+
+
+
+
+
+
+
+ENTER_DESCRIPTION(Span_bar_engraver,
+/* descr */       "This engraver makes cross-staff barlines: It catches all normal
+bar lines, and draws a single span-bar across them.",
+/* creats*/       "SpanBar",
+/* acks  */       "bar-line-interface",
+/* reads */       "",
+/* write */       "");