X-Git-Url: https://git.donarmstrong.com/?a=blobdiff_plain;f=lily%2Fspan-bar-engraver.cc;h=a3d1fc4887b4cee567150b5d9410c97dbb0dabd7;hb=4f3601e13136480291539af1b36b54d2882a3286;hp=3848b84164daa58e39762735a6b7dfe312d3128e;hpb=622b379cd71af8dde94f68135a489b2536309e6f;p=lilypond.git

diff --git a/lily/span-bar-engraver.cc b/lily/span-bar-engraver.cc
index 3848b84164..a3d1fc4887 100644
--- a/lily/span-bar-engraver.cc
+++ b/lily/span-bar-engraver.cc
@@ -1,19 +1,82 @@
-#include "base-span-bar-engraver.hh"
+/*
+  span-bar-engraver.cc -- implement Span_bar_engraver
 
+  source file of the GNU LilyPond music typesetter
 
-class Span_bar_engraver : public Base_span_bar_engraver
+  (c) 1997--2005 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+*/
+
+#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
 {
-protected:
-  Span_bar *get_span_bar_p ();
+  Item *spanbar_;
+  Link_array<Item> bars_;
+
 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 ();
 };
 
-
 Span_bar_engraver::Span_bar_engraver ()
 {
-  use_priority_b_ = false;
+  spanbar_ = 0;
+}
+
+void
+Span_bar_engraver::acknowledge_grob (Grob_info i)
+{
+  int depth = i.origin_contexts (this).size ();
+  if (depth && Bar_line::has_interface (i.grob ()))
+    {
+      Item *it = dynamic_cast<Item *> (i.grob ());
+      bars_.push (it);
+
+      if (bars_.size () >= 2 && !spanbar_)
+	{
+	  spanbar_ = make_item ("SpanBar", SCM_EOL);
+
+	  spanbar_->set_parent (bars_[0], X_AXIS);
+	}
+    }
+}
+
+void
+Span_bar_engraver::stop_translation_timestep ()
+{
+  if (spanbar_)
+    {
+      for (int i = 0; i < bars_.size (); i++)
+	Span_bar::add_bar (spanbar_, bars_[i]);
+
+      SCM vissym = ly_symbol2scm ("break-visibility");
+      SCM vis = bars_[0]->internal_get_property (vissym);
+      if (ly_c_equal_p (spanbar_->internal_get_property (vissym), vis))
+	spanbar_->internal_set_property (vissym, vis);
+
+      spanbar_ = 0;
+    }
+  bars_.set_size (0);
 }
 
-ADD_THIS_TRANSLATOR(Span_bar_engraver);
+ADD_TRANSLATOR (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",
+		/* accepts */ "",
+		/* acks  */ "bar-line-interface",
+		/* reads */ "",
+		/* write */ "");