Release: bump Welcome versions.

[lilypond.git] / lily / note-head-line-engraver.cc

diff --git a/lily/note-head-line-engraver.cc b/lily/note-head-line-engraver.cc
index 3f7d9d3f53b71c5d1d60487b208e1abf1d19ceca..f2d3ad8684346d826fc830c9462767254c8b13f9 100644 (file)
--- a/lily/note-head-line-engraver.cc
+++ b/lily/note-head-line-engraver.cc
@@ -1,109 +1,129 @@
-/*   
-  note-head-line-engraver.cc -- implement Note_head_line_engraver
-  
-  source file of the GNU LilyPond music typesetter
-  
-  (c) 2000 Jan Nieuwenhuizen <janneke@gnu.org>
- */
+/*
+  This file is part of LilyPond, the GNU music typesetter.
+
+  Copyright (C) 2000--2015 Jan Nieuwenhuizen <janneke@gnu.org>
+
+  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 "engraver.hh"
-#include "group-interface.hh"
-#include "item.hh"
-#include "musical-request.hh"
-#include "spanner.hh"
+#include "pointer-group-interface.hh"
+#include "stem.hh"
 #include "rhythmic-head.hh"
 #include "side-position-interface.hh"
 #include "staff-symbol-referencer.hh"
-#include "protected-scm.hh"
+#include "context.hh"
+#include "spanner.hh"
+#include "item.hh"
 
 /**
-   Create line-spanner grobs for glissandi (and possibly other) lines
-   that connect note heads.
- */
+   Create line-spanner grobs for lines that connect note heads.
 
+   TODO: have the line commit suicide if the notes are connected with
+   either slur or beam.
+*/
 class Note_head_line_engraver : public Engraver
 {
 public:
-  VIRTUAL_COPY_CONS (Translator);
-  Note_head_line_engraver ();
+  TRANSLATOR_DECLARATIONS (Note_head_line_engraver);
 
 protected:
-  virtual void acknowledge_grob (Grob_info);
-  virtual void create_grobs ();
-  virtual void stop_translation_timestep ();
-  virtual bool try_music (Music *);
+  void acknowledge_rhythmic_head (Grob_info);
+  void process_acknowledged ();
+  void stop_translation_timestep ();
 
 private:
-  Spanner* line_; 
-  Request* req_;
-  Protected_scm heads_;
+  Spanner *line_;
+  Context *last_staff_;
+  bool follow_;
+  Grob *head_;
+  Grob *last_head_;
 };
 
-Note_head_line_engraver::Note_head_line_engraver ()
+Note_head_line_engraver::Note_head_line_engraver (Context *c)
+  : Engraver (c)
 {
   line_ = 0;
-  req_ = 0;
-  heads_ = SCM_EOL;
-}
-
-bool
-Note_head_line_engraver::try_music (Music* m)
-{
-  if (!req_)
-    {
-      if (Glissando_req *r = dynamic_cast<Glissando_req*> (m))
-       {
-         req_ = r;
-         return true;
-       }
-    }
-  return false;
+  follow_ = false;
+  head_ = 0;
+  last_head_ = 0;
+  last_staff_ = 0;
 }
 
 void
-Note_head_line_engraver::acknowledge_grob (Grob_info info)
+Note_head_line_engraver::acknowledge_rhythmic_head (Grob_info info)
 {
-  if (req_)
+  head_ = info.grob ();
+  Context *tr = find_context_above (context (), ly_symbol2scm ("Staff"));
+  if (tr
+      && tr != last_staff_
+      && to_boolean (get_property ("followVoice")))
     {
-      if (Rhythmic_head::has_interface (info.elem_l_))
-       {
-         heads_ = gh_cons (info.elem_l_->self_scm (), heads_);
-       }
+      if (last_head_)
+        follow_ = true;
     }
+  last_staff_ = tr;
 }
 
 void
-Note_head_line_engraver::create_grobs ()
+Note_head_line_engraver::process_acknowledged ()
 {
-  if (!line_ && scm_ilength (heads_) > 1)
+  if (!line_ && follow_ && last_head_ && head_)
     {
-      /* type Glissando? */
-      line_ = new Spanner (get_property ("NoteHeadLine"));
-      line_->set_bound (LEFT, unsmob_grob (gh_car (heads_)));
-      line_->set_bound (RIGHT, unsmob_grob (ly_last (heads_)));
+      /* TODO: Don't follow if there's a beam.
 
-      line_->set_parent (unsmob_grob (gh_car (heads_)), X_AXIS);
-      line_->set_parent (unsmob_grob (gh_car (heads_)), Y_AXIS);
+      We can't do beam-stuff here, since beam doesn't exist yet.
+      Should probably store follow_ in line_, and suicide at some
+      later point */
+      if (follow_)
+        line_ = make_spanner ("VoiceFollower", head_->self_scm ());
 
-      line_->set_parent (unsmob_grob (ly_last (heads_)), X_AXIS);
-      line_->set_parent (unsmob_grob (ly_last (heads_)), Y_AXIS);
+      line_->set_bound (LEFT, last_head_);
+      line_->set_bound (RIGHT, head_);
 
-      announce_grob (line_, req_);
-      req_ = 0;
-      heads_ = SCM_EOL;
+      follow_ = false;
     }
 }
 
 void
 Note_head_line_engraver::stop_translation_timestep ()
 {
-  if (line_)
-    {
-      typeset_grob (line_);
-      line_ = 0;
-    }
+  line_ = 0;
+  if (head_)
+    last_head_ = head_;
+  head_ = 0;
 }
 
+#include "translator.icc"
+
+void
+Note_head_line_engraver::boot ()
+{
+  ADD_ACKNOWLEDGER (Note_head_line_engraver, rhythmic_head);
+}
+
+ADD_TRANSLATOR (Note_head_line_engraver,
+                /* doc */
+                "Engrave a line between two note heads in a staff"
+                " switch if @code{followVoice} is set.",
+
+                /* create */
+                "VoiceFollower ",
 
-ADD_THIS_TRANSLATOR (Note_head_line_engraver);
+                /* read */
+                "followVoice ",
 
+                /* write */
+                ""
+               );