Web-ja: update introduction

[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 b489af8b148fa9d18f15495646a96899b2451d1c..f2d3ad8684346d826fc830c9462767254c8b13f9 100644 (file)
--- a/lily/note-head-line-engraver.cc
+++ b/lily/note-head-line-engraver.cc
@@ -1,29 +1,37 @@
-/*   
-  note-head-line-engraver.cc -- implement Note_head_line_engraver
-  
-  source file of the GNU LilyPond music typesetter
-  
-  (c) 2000--2004 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 "event.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 "context.hh"
-
+#include "spanner.hh"
+#include "item.hh"
 
 /**
    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
 {
@@ -31,19 +39,20 @@ public:
   TRANSLATOR_DECLARATIONS (Note_head_line_engraver);
 
 protected:
-  virtual void acknowledge_grob (Grob_info);
-  virtual void process_acknowledged_grobs ();
-  virtual void stop_translation_timestep ();
+  void acknowledge_rhythmic_head (Grob_info);
+  void process_acknowledged ();
+  void stop_translation_timestep ();
 
 private:
-  Spanner* line_; 
-  Context* last_staff_;
+  Spanner *line_;
+  Context *last_staff_;
   bool follow_;
-  Grob* head_;
-  Grob* last_head_;
+  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;
   follow_ = false;
@@ -53,45 +62,35 @@ Note_head_line_engraver::Note_head_line_engraver ()
 }
 
 void
-Note_head_line_engraver::acknowledge_grob (Grob_info info)
+Note_head_line_engraver::acknowledge_rhythmic_head (Grob_info info)
 {
-  if (Rhythmic_head::has_interface (info.grob_))
+  head_ = info.grob ();
+  Context *tr = find_context_above (context (), ly_symbol2scm ("Staff"));
+  if (tr
+      && tr != last_staff_
+      && to_boolean (get_property ("followVoice")))
     {
-      head_ = info.grob_;
-      if (to_boolean (get_property ("followVoice")))
-       {
-         Context * tr = context ();
-         while (tr && !tr->is_alias (ly_symbol2scm ( "Staff")))
-           tr = tr->get_parent_context () ;
-
-         if (tr
-             && tr->is_alias (ly_symbol2scm ("Staff")) && tr != last_staff_)
-           {
-             if (last_head_)
-               follow_ = true;
-             last_staff_ = tr;
-           }
-       }
+      if (last_head_)
+        follow_ = true;
     }
+  last_staff_ = tr;
 }
 
-
 void
-Note_head_line_engraver::process_acknowledged_grobs ()
+Note_head_line_engraver::process_acknowledged ()
 {
   if (!line_ && follow_ && last_head_ && head_)
     {
       /* TODO: Don't follow if there's a beam.
 
-        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 */
+      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_ = make_spanner ("VoiceFollower", head_->self_scm ());
+
       line_->set_bound (LEFT, last_head_);
       line_->set_bound (RIGHT, head_);
-      
 
       follow_ = false;
     }
@@ -106,14 +105,25 @@ Note_head_line_engraver::stop_translation_timestep ()
   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 ",
 
+                /* read */
+                "followVoice ",
 
-ENTER_DESCRIPTION (Note_head_line_engraver,
-/* descr */       "Engrave a line between two note heads, for example a glissando.  If "
-" followVoice is set, staff switches also generate a line.",
-/* creats*/       "Glissando VoiceFollower",
-/* accepts */     "glissando-event",
-/* acks  */       "rhythmic-head-interface",
-/* reads */       "followVoice",
-/* write */       "");
+                /* write */
+                ""
+               );