lily/slur-performer.cc

   1 /*
   2   This file is part of LilyPond, the GNU music typesetter.
   3
   4   Copyright (C) 1996--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 "performer.hh"
  21 #include "audio-item.hh"
  22 #include "audio-column.hh"
  23 #include "global-context.hh"
  24 #include "stream-event.hh"
  25 #include "warn.hh"
  26
  27 #include "translator.icc"
  28
  29 /*
  30   this is C&P from beam_performer.
  31 */
  32
  33 class Slur_performer : public Performer
  34 {
  35 public:
  36   TRANSLATOR_DECLARATIONS (Slur_performer);
  37
  38 protected:
  39   void start_translation_timestep ();
  40   void process_music ();
  41   void set_melisma (bool);
  42
  43   DECLARE_TRANSLATOR_LISTENER (slur);
  44 private:
  45   Stream_event *start_ev_;
  46   Stream_event *now_stop_ev_;
  47   bool slur_;
  48 };
  49
  50 Slur_performer::Slur_performer ()
  51 {
  52   slur_ = false;
  53   start_ev_ = 0;
  54   now_stop_ev_ = 0;
  55 }
  56
  57 void
  58 Slur_performer::process_music ()
  59 {
  60   if (now_stop_ev_)
  61     {
  62       slur_ = false;
  63       set_melisma (false);
  64     }
  65
  66   if (start_ev_)
  67     {
  68       slur_ = true;
  69       set_melisma (true);
  70     }
  71 }
  72
  73 void
  74 Slur_performer::set_melisma (bool ml)
  75 {
  76   context ()->set_property ("slurMelismaBusy", ml ? SCM_BOOL_T : SCM_BOOL_F);
  77 }
  78
  79 void
  80 Slur_performer::start_translation_timestep ()
  81 {
  82   start_ev_ = 0;
  83   now_stop_ev_ = 0;
  84 }
  85
  86 IMPLEMENT_TRANSLATOR_LISTENER (Slur_performer, slur);
  87 void
  88 Slur_performer::listen_slur (Stream_event *ev)
  89 {
  90   Direction d = to_dir (ev->get_property ("span-direction"));
  91
  92   if (d == START)
  93     start_ev_ = ev;
  94   else if (d == STOP)
  95     now_stop_ev_ = ev;
  96 }
  97
  98 ADD_TRANSLATOR (Slur_performer,
  99                 /* doc */
 100                 "",
 101
 102                 /* create */
 103                 "",
 104
 105                 /* read */
 106                 "",
 107
 108                 /* write */
 109                 ""
 110                 );