+/*
+ This file is part of LilyPond, the GNU music typesetter.
+
+ Copyright (C) 2014--2014 Janek Warchoł <lemniskata.bernoullego@gmail.com>
+
+ 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"
+
+struct Clef_modifier
+{
+ DECLARE_SCHEME_CALLBACK (calc_parent_alignment, (SCM));
+ DECLARE_GROB_INTERFACE ();
+};
+
+MAKE_SCHEME_CALLBACK (Clef_modifier, calc_parent_alignment, 1)
+SCM
+Clef_modifier::calc_parent_alignment (SCM smob)
+{
+ Grob *me = Grob::unsmob (smob);
+ Grob *clef = me->get_parent (X_AXIS);
+ string full_clef_name = ly_scm2string (clef->get_property ("glyph"));
+
+ int separator_position = full_clef_name.find ('.');
+ string clef_type = full_clef_name.substr (separator_position + 1,
+ separator_position + 2);
+
+ // find entry with keyname clef_type in clef-alignments
+ SCM alist_entry = scm_assq (ly_symbol2scm (clef_type.c_str ()),
+ me->get_property ("clef-alignments"));
+
+ if (scm_is_pair (alist_entry))
+ {
+ SCM entry_value = scm_cdr (alist_entry);
+ // the value should be a pair of numbers - first is the alignment
+ // for modifiers below the clef, second for those above.
+ if (scm_is_pair (entry_value))
+ if (robust_scm2dir (me->get_property ("direction"), DOWN) == DOWN)
+ return scm_car (entry_value);
+ else
+ return scm_cdr (entry_value);
+
+ else // default alignment = centered
+ return scm_from_double (0);
+ }
+ else // default alignment = centered
+ return scm_from_double (0);
+}
+
+ADD_INTERFACE (Clef_modifier,
+ "The number describing transposition of the clef, placed below\n"
+ "or above clef sign. Usually this is 8 (octave transposition)\n"
+ "or 15 (two octaves), but LilyPond allows any integer here.",
+
+ /* properties */
+ "clef-alignments "
+ );
+