Issue 4965: Create and use Grob::parent_relative

[lilypond.git] / lily / key-engraver.cc

diff --git a/lily/key-engraver.cc b/lily/key-engraver.cc
index 07324d230b58d2b0dbd36cc5d233be7d4d63f93f..115902e89db2b789f80e3d257b471c7a75f07143 100644 (file)
--- a/lily/key-engraver.cc
+++ b/lily/key-engraver.cc
@@ -1,7 +1,7 @@
 /*
   This file is part of LilyPond, the GNU music typesetter.
 
-  Copyright (C) 1997--2014 Han-Wen Nienhuys <hanwen@xs4all.nl>
+  Copyright (C) 1997--2015 Han-Wen Nienhuys <hanwen@xs4all.nl>
 
   LilyPond is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -46,9 +46,9 @@ protected:
   void stop_translation_timestep ();
   void process_music ();
 
-  DECLARE_TRANSLATOR_LISTENER (key_change);
-  DECLARE_ACKNOWLEDGER (clef);
-  DECLARE_ACKNOWLEDGER (bar_line);
+  void listen_key_change (Stream_event *);
+  void acknowledge_clef (Grob_info);
+  void acknowledge_bar_line (Grob_info);
 };
 
 void
@@ -82,7 +82,7 @@ Key_engraver::create_key (bool is_default)
       SCM key = get_property ("keyAlterations");
 
       if ((to_boolean (get_property ("printKeyCancellation"))
-           || key == SCM_EOL)
+           || scm_is_null (key))
           && !scm_is_eq (last, key))
         {
           SCM restore = SCM_EOL;
@@ -90,7 +90,7 @@ Key_engraver::create_key (bool is_default)
             {
               SCM new_alter_pair = scm_assoc (scm_caar (s), key);
               Rational old_alter = robust_scm2rational (scm_cdar (s), 0);
-              if (new_alter_pair == SCM_BOOL_F
+              if (scm_is_false (new_alter_pair)
                   || ((ly_scm2rational (scm_cdr (new_alter_pair)) - old_alter) * old_alter
                       < Rational (0)))
                 {
@@ -117,10 +117,10 @@ Key_engraver::create_key (bool is_default)
     {
       SCM visibility = get_property ("explicitKeySignatureVisibility");
       item_->set_property ("break-visibility", visibility);
+      item_->set_property ("non-default", SCM_BOOL_T);
     }
 }
 
-IMPLEMENT_TRANSLATOR_LISTENER (Key_engraver, key_change);
 void
 Key_engraver::listen_key_change (Stream_event *ev)
 {
@@ -140,8 +140,7 @@ Key_engraver::acknowledge_clef (Grob_info /* info */)
 void
 Key_engraver::acknowledge_bar_line (Grob_info /* info */)
 {
-  if (scm_is_pair (get_property ("keyAlterations")))
-    create_key (true);
+  create_key (true);
 }
 
 void
@@ -213,8 +212,14 @@ Key_engraver::initialize ()
   context ()->set_property ("tonic", p.smobbed_copy ());
 }
 
-ADD_ACKNOWLEDGER (Key_engraver, clef);
-ADD_ACKNOWLEDGER (Key_engraver, bar_line);
+
+void
+Key_engraver::boot ()
+{
+  ADD_LISTENER (Key_engraver, key_change);
+  ADD_ACKNOWLEDGER (Key_engraver, clef);
+  ADD_ACKNOWLEDGER (Key_engraver, bar_line);
+}
 
 ADD_TRANSLATOR (Key_engraver,
                 /* doc */