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--2008 Han-Wen Nienhuys <hanwen@xs4all.nl>, Glen Prideaux <glenprideaux@iname.com>
   7 */
   8
   9 #include "engraver.hh"
  10 #include "side-position-interface.hh"
  11 #include "text-interface.hh"
  12 #include "item.hh"
  13
  14 class Stanza_number_engraver : public Engraver
  15 {
  16   Item *text_;
  17
  18   SCM last_stanza_;
  19 public:
  20   TRANSLATOR_DECLARATIONS (Stanza_number_engraver);
  21   void process_music ();
  22   virtual void derived_mark () const;
  23   void stop_translation_timestep ();
  24   DECLARE_ACKNOWLEDGER (lyric_syllable);
  25 };
  26
  27 void
  28 Stanza_number_engraver::derived_mark () const
  29 {
  30   scm_gc_mark (last_stanza_);
  31 }
  32
  33 /*
  34   TODO: should make engraver that collects all the stanzas on a higher
  35   level, and then groups them to the side. Stanza numbers should be
  36   all aligned.
  37 */
  38
  39 Stanza_number_engraver::Stanza_number_engraver ()
  40 {
  41   text_ = 0;
  42   last_stanza_ = SCM_EOL;
  43 }
  44
  45 void
  46 Stanza_number_engraver::process_music ()
  47 {
  48   SCM stanza = get_property ("stanza");
  49
  50   if (Text_interface::is_markup (stanza)
  51       && stanza != last_stanza_)
  52     {
  53       last_stanza_ = stanza;
  54
  55       text_ = make_item ("StanzaNumber", SCM_EOL);
  56       text_->set_property ("text", stanza);
  57     }
  58 }
  59
  60 void
  61 Stanza_number_engraver::acknowledge_lyric_syllable (Grob_info inf)
  62 {
  63   if (text_)
  64     Side_position_interface::add_support (text_, inf.grob ());
  65 }
  66
  67 void
  68 Stanza_number_engraver::stop_translation_timestep ()
  69 {
  70   text_ = 0;
  71 }
  72
  73 #include "translator.icc"
  74
  75 ADD_ACKNOWLEDGER (Stanza_number_engraver, lyric_syllable);
  76 ADD_TRANSLATOR (Stanza_number_engraver,
  77                 /* doc */
  78                 "Engrave stanza numbers.",
  79
  80                 /* create */
  81                 "StanzaNumber ",
  82
  83                 /* read */
  84                 "stanza ",
  85
  86                 /* write */
  87                 ""
  88                 );