lily/span-arpeggio-engraver.cc

   1 /*
   2   span-arpeggio-engraver.cc -- implement Span_arpeggio_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 2000--2006 Jan Nieuwenhuizen <janneke@gnu.org>
   7
   8   Han-Wen Nienhuys <hanwen@xs4all.nl>
   9 */
  10
  11 #include "engraver.hh"
  12 #include "arpeggio.hh"
  13 #include "pointer-group-interface.hh"
  14 #include "side-position-interface.hh"
  15 #include "staff-symbol-referencer.hh"
  16
  17 /**
  18    Make arpeggios that span multiple staves.  Catch arpeggios, and span a
  19    Span_arpeggio over them if we find more than two arpeggios.
  20 */
  21 class Span_arpeggio_engraver : public Engraver
  22 {
  23 public:
  24   TRANSLATOR_DECLARATIONS (Span_arpeggio_engraver);
  25   DECLARE_ACKNOWLEDGER (arpeggio);
  26
  27 protected:
  28   void process_acknowledged ();
  29   void stop_translation_timestep ();
  30
  31 private:
  32   Item *span_arpeggio_;
  33   vector<Grob*> arpeggios_;
  34 };
  35
  36 Span_arpeggio_engraver::Span_arpeggio_engraver ()
  37 {
  38   span_arpeggio_ = 0;
  39 }
  40
  41 void
  42 Span_arpeggio_engraver::acknowledge_arpeggio (Grob_info info)
  43 {
  44   if (info.origin_contexts (this).size ()) // huh? what's this test for?
  45     arpeggios_.push_back (info.grob ());
  46 }
  47
  48 void
  49 Span_arpeggio_engraver::process_acknowledged ()
  50 {
  51   /*
  52     connectArpeggios is slightly brusque; we should really read a grob
  53     property of the caught non-span arpeggios. That way, we can have
  54
  55     both non-connected and connected arps in one pianostaff.
  56
  57   */
  58   if (!span_arpeggio_ && arpeggios_.size () > 1
  59       && to_boolean (get_property ("connectArpeggios")))
  60     span_arpeggio_ = make_item ("Arpeggio", SCM_EOL);
  61 }
  62
  63 void
  64 Span_arpeggio_engraver::stop_translation_timestep ()
  65 {
  66   if (span_arpeggio_)
  67     {
  68       /*
  69         we do this very late, to make sure we also catch `extra'
  70         side-pos support like accidentals.
  71       */
  72       for (vsize j = 0; j < arpeggios_.size (); j++)
  73         {
  74           extract_grob_set (arpeggios_[j], "stems", stems);
  75           for (vsize i = stems.size (); i--;)
  76             Pointer_group_interface::add_grob (span_arpeggio_, ly_symbol2scm ("stems"),
  77                                                stems[i]);
  78
  79           extract_grob_set (arpeggios_[j], "side-support-elements", sses);
  80           for (vsize i = sses.size (); i--;)
  81             Pointer_group_interface::add_grob (span_arpeggio_, ly_symbol2scm ("side-support-elements"),
  82                                                sses[i]);
  83
  84           /*
  85             we can't kill the children, since we don't want to the
  86             previous note to bump into the span arpeggio; so we make
  87             it transparent.  */
  88           arpeggios_[j]->set_property ("transparent", SCM_BOOL_T);
  89         }
  90
  91       span_arpeggio_ = 0;
  92     }
  93   arpeggios_.clear ();
  94 }
  95
  96 #include "translator.icc"
  97
  98 ADD_ACKNOWLEDGER (Span_arpeggio_engraver, arpeggio);
  99 ADD_TRANSLATOR (Span_arpeggio_engraver,
 100                 /* doc */ "",
 101                 /* create */ "Arpeggio",
 102                 /* accept */ "",
 103                 /* read */ "connectArpeggios",
 104                 /* write */ "");