Issue 5167/6: Changes: show \markup xxx = ... \etc assignments

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

diff --git a/lily/span-bar-engraver.cc b/lily/span-bar-engraver.cc
index 135d978c15864841a09858bdaa4441a38485d1fa..55ef59e32e40f656388f06b27f7cdf42a6a03b06 100644 (file)
--- a/lily/span-bar-engraver.cc
+++ b/lily/span-bar-engraver.cc
@@ -1,17 +1,117 @@
-#include "base-span-bar-engraver.hh"
+/*
+  This file is part of LilyPond, the GNU music typesetter.
 
+  Copyright (C) 1997--2015 Han-Wen Nienhuys <hanwen@xs4all.nl>
 
-class Span_bar_engraver : public Base_span_bar_engraver
+  LilyPond is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  LilyPond is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "item.hh"
+#include "engraver.hh"
+#include "pointer-group-interface.hh"
+#include "lily-imports.hh"
+
+#include "translator.icc"
+
+/**
+
+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_;
+  bool make_spanbar_;
+  vector<Item *> bars_;
+
 public:
-  Span_bar_engraver ();
-  VIRTUAL_COPY_CONS (Translator);
+  TRANSLATOR_DECLARATIONS (Span_bar_engraver);
+protected:
+  void acknowledge_bar_line (Grob_info);
+  void stop_translation_timestep ();
+  void process_acknowledged ();
 };
 
+Span_bar_engraver::Span_bar_engraver (Context *c)
+  : Engraver (c)
+{
+  spanbar_ = 0;
+  make_spanbar_ = false;
+}
 
-Span_bar_engraver::Span_bar_engraver ()
+void
+Span_bar_engraver::acknowledge_bar_line (Grob_info i)
 {
-  use_priority_b_ = false;
+  int depth = i.origin_contexts (this).size ();
+  if (depth && !i.grob ()->internal_has_interface (ly_symbol2scm ("span-bar-interface")))
+    {
+      Item *it = dynamic_cast<Item *> (i.grob ());
+      bars_.push_back (it);
+
+      if (bars_.size () >= 2 && !spanbar_)
+        make_spanbar_ = true;
+    }
 }
 
-ADD_THIS_TRANSLATOR(Span_bar_engraver);
+void
+Span_bar_engraver::process_acknowledged ()
+{
+  if (make_spanbar_)
+    {
+      spanbar_ = make_item ("SpanBar", SCM_EOL);
+
+      spanbar_->set_parent (bars_[0], X_AXIS);
+      for (vsize i = 0; i < bars_.size (); i++)
+        Pointer_group_interface::add_grob (spanbar_, ly_symbol2scm ("elements"), bars_[i]);
+      make_spanbar_ = false;
+    }
+}
+
+void
+Span_bar_engraver::stop_translation_timestep ()
+{
+  if (spanbar_)
+    {
+      SCM vis = bars_[0]->get_property ("break-visibility");
+      if (ly_is_equal (spanbar_->get_property ("break-visibility"), vis))
+        spanbar_->set_property ("break-visibility", vis);
+      Lily::span_bar_notify_grobs_of_my_existence (spanbar_->self_scm ());
+      spanbar_ = 0;
+    }
+  bars_.resize (0);
+}
+
+void
+Span_bar_engraver::boot ()
+{
+  ADD_ACKNOWLEDGER (Span_bar_engraver, bar_line);
+}
+
+ADD_TRANSLATOR (Span_bar_engraver,
+                /* doc */
+                "Make cross-staff bar lines: It catches all normal bar lines"
+                " and draws a single span bar across them.",
+
+                /* create */
+                "SpanBar ",
+
+                /* read */
+                "",
+
+                /* write */
+                ""
+               );