release: 1.3.42

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

diff --git a/lily/span-bar-engraver.cc b/lily/span-bar-engraver.cc
index 135d978c15864841a09858bdaa4441a38485d1fa..e8d771e263953601f8b78d7ce5e691bb84713a38 100644 (file)
--- a/lily/span-bar-engraver.cc
+++ b/lily/span-bar-engraver.cc
@@ -1,17 +1,99 @@
-#include "base-span-bar-engraver.hh"
+/*
+  span-bar-grav.cc -- implement Span_bar_engraver
 
+  source file of the GNU LilyPond music typesetter
 
-class Span_bar_engraver : public Base_span_bar_engraver
+  (c)  1997--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
+*/
+
+#include "dimension-cache.hh"
+#include "lily-guile.hh"
+#include "span-bar.hh"
+#include "engraver.hh"
+
+/** 
+
+  Make bars that span multiple "staffs". Catch bars, and span a
+  Span_bar over them if we find more than 2 bars.  Vertical alignment
+  of staffs 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
 {
+  Span_bar * spanbar_p_;
+  Link_array<Bar> bar_l_arr_;
+
 public:
-  Span_bar_engraver ();
-  VIRTUAL_COPY_CONS (Translator);
+  VIRTUAL_COPY_CONS(Translator);
+  Span_bar_engraver();
+protected:
+  virtual void acknowledge_element (Score_element_info);
+  virtual void do_pre_move_processing();
+  virtual Span_bar* get_span_bar_p() const;
 };
 
 
-Span_bar_engraver::Span_bar_engraver ()
+Span_bar_engraver::Span_bar_engraver()
+{
+  spanbar_p_ =0;
+}
+
+Span_bar*
+Span_bar_engraver::get_span_bar_p() const
+{
+  return new Span_bar;
+}
+
+
+void
+Span_bar_engraver::acknowledge_element (Score_element_info i)
 {
-  use_priority_b_ = false;
+  int depth = i.origin_trans_l_arr (this).size();
+  if (depth > 1
+      && dynamic_cast<Bar *> (i.elem_l_)) 
+    {
+      bar_l_arr_.push (dynamic_cast<Bar *> (i.elem_l_));
+
+      if (bar_l_arr_.size() >= 2 && !spanbar_p_) 
+       {
+         spanbar_p_ = get_span_bar_p();
+         spanbar_p_->set_parent (bar_l_arr_[0], Y_AXIS);
+
+         /*
+           UGH. UGH UUHGK GUHG G
+          */
+         String visnam =  String(name()) + "-visibility";
+
+         spanbar_p_->set_elt_property ("visibility-lambda",
+                                       scm_eval (ly_symbol2scm (visnam.ch_C())));
+
+         spanbar_p_->set_parent (bar_l_arr_[0], X_AXIS);
+         announce_element (Score_element_info (spanbar_p_,0));
+         if (!gh_string_p (spanbar_p_->get_elt_property ("glyph")))
+           spanbar_p_-> set_elt_property ("glyph",
+                                          bar_l_arr_[0]->get_elt_property ("glyph"));
+       }
+    }
+}
+
+void
+Span_bar_engraver::do_pre_move_processing()
+{
+  if (spanbar_p_) 
+    {
+      for (int i=0; i < bar_l_arr_.size() ; i++)
+       spanbar_p_->add_bar (bar_l_arr_[i]);
+      typeset_element (spanbar_p_);
+      spanbar_p_ =0;
+    }
+  bar_l_arr_.set_size (0);
 }
 
+
+
 ADD_THIS_TRANSLATOR(Span_bar_engraver);
+
+
+