Imported Upstream version 2.18.0

[lilypond.git] / lily / fingering-column-engraver.cc

diff --git a/lily/fingering-column-engraver.cc b/lily/fingering-column-engraver.cc
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+/*
+  This file is part of LilyPond, the GNU music typesetter.
+
+  Copyright (C) 2012 Mike Solomon <mike@mikesolomon.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 "side-position-interface.hh"
+#include "pointer-group-interface.hh"
+#include "fingering-column.hh"
+#include "item.hh"
+
+#include "translator.icc"
+
+/**
+   Find potentially colliding scripts, and put them in a
+   Fingering_column, that will fix the columns.  */
+class Fingering_column_engraver : public Engraver
+{
+  Drul_array<Grob *> fingering_columns_;
+  Drul_array<vector<Grob *> > scripts_;
+  vector<Grob *> possibles_;
+
+public:
+  TRANSLATOR_DECLARATIONS (Fingering_column_engraver);
+protected:
+  DECLARE_ACKNOWLEDGER (finger);
+  void process_acknowledged ();
+  void stop_translation_timestep ();
+};
+
+Fingering_column_engraver::Fingering_column_engraver ()
+{
+  for (LEFT_and_RIGHT (d))
+    fingering_columns_[d] = 0;
+}
+
+void
+Fingering_column_engraver::stop_translation_timestep ()
+{
+  for (vsize i = 0; i < possibles_.size (); i++)
+    if (!Item::is_non_musical (possibles_[i]))
+      {
+        if (Side_position_interface::get_axis (possibles_[i]) == X_AXIS)
+          {
+            Direction d = robust_scm2dir (possibles_[i]->get_property ("direction"), CENTER);
+            if (d)
+              scripts_[d].push_back (possibles_[i]);
+            else
+              possibles_[i]->warning ("Cannot add a fingering without a direction.");
+          }
+      }
+
+  for (LEFT_and_RIGHT (d))
+    {
+      if (scripts_[d].size () < 2 && fingering_columns_[d])
+        {
+          fingering_columns_[d]->suicide ();
+          fingering_columns_[d] = 0;
+        }
+      if (fingering_columns_[d])
+        {
+          for (vsize i = 0; i < scripts_[d].size (); i++)
+            Fingering_column::add_fingering (fingering_columns_[d], scripts_[d][i]);
+
+        }
+      scripts_[d].clear ();
+      fingering_columns_[d] = 0;
+    }
+  possibles_.clear ();
+}
+
+void
+Fingering_column_engraver::acknowledge_finger (Grob_info inf)
+{
+  Item *thing = dynamic_cast<Item *> (inf.grob ());
+  if (thing)
+    possibles_.push_back (thing);
+}
+
+void
+Fingering_column_engraver::process_acknowledged ()
+{
+  for (LEFT_and_RIGHT (d))
+    {
+      if (possibles_.size () > 1 && !fingering_columns_[d])
+        fingering_columns_[d] = make_item ("FingeringColumn", SCM_EOL);
+    }
+}
+
+ADD_ACKNOWLEDGER (Fingering_column_engraver, finger);
+ADD_TRANSLATOR (Fingering_column_engraver,
+                /* doc */
+                "Find potentially colliding scripts and put them into a"
+                " @code{FingeringColumn} object; that will fix the collisions.",
+
+                /* create */
+                "FingeringColumn ",
+
+                /* read */
+                "",
+
+                /* write */
+                ""
+               );