Imported Upstream version 2.19.45

[lilypond.git] / lily / clef-modifier.cc

diff --git a/lily/clef-modifier.cc b/lily/clef-modifier.cc
new file mode 100644 (file)
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+++ b/lily/clef-modifier.cc
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+/*
+  This file is part of LilyPond, the GNU music typesetter.
+
+  Copyright (C) 2014--2015 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));
+};
+
+MAKE_SCHEME_CALLBACK (Clef_modifier, calc_parent_alignment, 1)
+SCM
+Clef_modifier::calc_parent_alignment (SCM smob)
+{
+  Grob *me = unsmob<Grob> (smob);
+  Grob *clef = me->get_parent (X_AXIS);
+  string full_clef_name = ly_scm2string (clef->get_property ("glyph"));
+  string clef_name = replace_all(&full_clef_name, "clefs.", "");
+
+  // find entry with keyname clef_type in clef-alignments
+  SCM alist_entry = scm_assq (ly_symbol2scm (clef_name.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 "
+              );
+