lily/arpeggio-engraver.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 2000--2010 Jan Nieuwenhuizen <janneke@gnu.org>
   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 #include "engraver.hh"
  21
  22 #include "pointer-group-interface.hh"
  23 #include "arpeggio.hh"
  24 #include "stem.hh"
  25 #include "rhythmic-head.hh"
  26 #include "side-position-interface.hh"
  27 #include "stream-event.hh"
  28 #include "note-column.hh"
  29 #include "item.hh"
  30
  31 #include "translator.icc"
  32
  33 class Arpeggio_engraver : public Engraver
  34 {
  35 public:
  36   TRANSLATOR_DECLARATIONS (Arpeggio_engraver);
  37
  38   void acknowledge_stem (Grob_info);
  39   void acknowledge_rhythmic_head (Grob_info);
  40 protected:
  41   void process_music ();
  42   void stop_translation_timestep ();
  43   DECLARE_TRANSLATOR_LISTENER (arpeggio);
  44 private:
  45   Item *arpeggio_;
  46   Stream_event *arpeggio_event_;
  47 };
  48
  49 Arpeggio_engraver::Arpeggio_engraver ()
  50 {
  51   arpeggio_ = 0;
  52   arpeggio_event_ = 0;
  53 }
  54
  55 IMPLEMENT_TRANSLATOR_LISTENER (Arpeggio_engraver, arpeggio);
  56 void Arpeggio_engraver::listen_arpeggio (Stream_event *ev)
  57 {
  58   ASSIGN_EVENT_ONCE (arpeggio_event_, ev);
  59 }
  60
  61 void
  62 Arpeggio_engraver::acknowledge_stem (Grob_info info)
  63 {
  64   if (arpeggio_)
  65     {
  66       if (!arpeggio_->get_parent (Y_AXIS))
  67         arpeggio_->set_parent (info.grob (), Y_AXIS);
  68
  69       Pointer_group_interface::add_grob (arpeggio_,
  70                                          ly_symbol2scm ("stems"),
  71                                          info.grob ());
  72     }
  73 }
  74 void
  75 Arpeggio_engraver::acknowledge_rhythmic_head (Grob_info info)
  76 {
  77   if (arpeggio_)
  78
  79     /*
  80       We can't catch local key items (accidentals) from Voice context,
  81       see Local_key_engraver
  82     */
  83     Side_position_interface::add_support (arpeggio_, info.grob ());
  84 }
  85
  86 void
  87 Arpeggio_engraver::process_music ()
  88 {
  89   if (arpeggio_event_)
  90     {
  91       arpeggio_ = make_item ("Arpeggio", arpeggio_event_->self_scm ());
  92     }
  93 }
  94
  95 void
  96 Arpeggio_engraver::stop_translation_timestep ()
  97 {
  98   arpeggio_ = 0;
  99   arpeggio_event_ = 0;
 100 }
 101
 102 ADD_ACKNOWLEDGER (Arpeggio_engraver, stem);
 103 ADD_ACKNOWLEDGER (Arpeggio_engraver, rhythmic_head);
 104
 105 ADD_TRANSLATOR (Arpeggio_engraver,
 106                 /* doc */
 107                 "Generate an Arpeggio symbol.",
 108
 109                 /* create */
 110                 "Arpeggio",
 111
 112                 /* read */
 113                 "",
 114
 115                 /* write */
 116                 ""
 117                 );