lily/stanza-number-engraver.cc

   1 /*
   2   lyric-number-engraver.cc -- implement Stanza_number_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2000--2005 Han-Wen Nienhuys <hanwen@cs.uu.nl>, Glen Prideaux <glenprideaux@iname.com>
   7 */
   8
   9 #include "engraver.hh"
  10 #include "side-position-interface.hh"
  11
  12 class Stanza_number_engraver : public Engraver
  13 {
  14   Item *text_;
  15
  16   SCM last_stanza_;
  17 public:
  18   TRANSLATOR_DECLARATIONS (Stanza_number_engraver);
  19   void process_music ();
  20   virtual void derived_mark () const;
  21   void stop_translation_timestep ();
  22   DECLARE_ACKNOWLEDGER (lyric_syllable);
  23 };
  24
  25 void
  26 Stanza_number_engraver::derived_mark () const
  27 {
  28   scm_gc_mark (last_stanza_);
  29 }
  30
  31 /*
  32   TODO: should make engraver that collects all the stanzas on a higher
  33   level, and then groups them to the side. Stanza numbers should be
  34   all aligned.
  35 */
  36
  37 Stanza_number_engraver::Stanza_number_engraver ()
  38 {
  39   text_ = 0;
  40   last_stanza_ = SCM_EOL;
  41 }
  42
  43 void
  44 Stanza_number_engraver::process_music ()
  45 {
  46   SCM stanza = get_property ("stanza");
  47
  48   if (scm_is_string (stanza) && stanza != last_stanza_)
  49     {
  50       last_stanza_ = stanza;
  51
  52       text_ = make_item ("StanzaNumber", SCM_EOL);
  53       text_->set_property ("text", stanza);
  54     }
  55 }
  56
  57 void
  58 Stanza_number_engraver::acknowledge_lyric_syllable (Grob_info inf)
  59 {
  60   if (text_)
  61     {
  62       Side_position_interface::add_support (text_, inf.grob ());
  63     }
  64 }
  65
  66 void
  67 Stanza_number_engraver::stop_translation_timestep ()
  68 {
  69   text_ = 0;
  70 }
  71
  72 #include "translator.icc"
  73
  74 ADD_ACKNOWLEDGER (Stanza_number_engraver, lyric_syllable);
  75 ADD_TRANSLATOR (Stanza_number_engraver,
  76                 /* doc */ "",
  77                 /* create */ "StanzaNumber",
  78                 /* accept */ "",
  79                 /* read */ "stanza",
  80                 /* write */ "");