lily/melody-engraver.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 1997--2011 Han-Wen Nienhuys <hanwen@xs4all.nl>
   5
   6   LilyPond is free software: you can redistribute it and/or modify
   7   it under the terms of the GNU General Public License as published by
   8   the Free Software Foundation, either version 3 of the License, or
   9   (at your option) any later version.
  10
  11   LilyPond is distributed in the hope that it will be useful,
  12   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14   GNU General Public License for more details.
  15
  16   You should have received a copy of the GNU General Public License
  17   along with LilyPond.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20
  21 #include "engraver.hh"
  22
  23 #include "item.hh"
  24 #include "melody-spanner.hh"
  25 #include "pointer-group-interface.hh"
  26
  27 class Melody_engraver : public Engraver
  28 {
  29   Grob *melody_item_;
  30   Grob *stem_;
  31 protected:
  32
  33   DECLARE_ACKNOWLEDGER (stem);
  34   DECLARE_ACKNOWLEDGER (slur);
  35   TRANSLATOR_DECLARATIONS (Melody_engraver);
  36   void stop_translation_timestep ();
  37   void process_music ();
  38 };
  39
  40
  41 Melody_engraver::Melody_engraver ()
  42 {
  43   stem_ = 0;
  44   melody_item_ = 0;
  45 }
  46
  47 void
  48 Melody_engraver::process_music ()
  49 {
  50   if (scm_is_string (get_property ("whichBar")))
  51     melody_item_ = 0;
  52 }
  53
  54 void
  55 Melody_engraver::stop_translation_timestep ()
  56 {
  57   if (stem_
  58       && !is_direction (stem_->get_property_data ("neutral-direction")))
  59     {
  60       extract_grob_set (stem_, "rests", rests);
  61       if (rests.size ())
  62         melody_item_ = 0;
  63       else
  64         {
  65           if (!melody_item_)
  66             melody_item_ = make_item ("MelodyItem", stem_->self_scm ());
  67
  68           Melody_spanner::add_stem (melody_item_, stem_);
  69         }
  70     }
  71   stem_ = 0;
  72 }
  73
  74
  75 void
  76 Melody_engraver::acknowledge_slur (Grob_info /* info */)
  77 {
  78   melody_item_ = 0;
  79 }
  80
  81
  82 void
  83 Melody_engraver::acknowledge_stem (Grob_info info)
  84 {
  85   stem_ = info.grob ();
  86 }
  87
  88
  89
  90 #include "translator.icc"
  91
  92 ADD_ACKNOWLEDGER (Melody_engraver, stem);
  93 ADD_ACKNOWLEDGER (Melody_engraver, slur);
  94
  95 ADD_TRANSLATOR (Melody_engraver,
  96                 /* doc */
  97                 "Create information for context dependent typesetting"
  98                 " decisions.",
  99
 100                 /* create */
 101                 "MelodyItem ",
 102
 103                 /* read */
 104                 "",
 105
 106                 /* write */
 107                 ""
 108                 );
 109