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--2004 Jan Nieuwenhuizen <janneke@gnu.org>
   7
   8   Han-Wen Nienhuys <hanwen@xs4all.nl>
   9 */
  10
  11 #include "engraver.hh"
  12 #include "lily-guile.hh"
  13 #include "item.hh"
  14 #include "arpeggio.hh"
  15 #include "group-interface.hh"
  16 #include "side-position-interface.hh"
  17 #include "staff-symbol-referencer.hh"
  18
  19
  20 /**
  21   Make arpeggios that span multiple staves.  Catch arpeggios, and span a
  22   Span_arpeggio over them if we find more than two arpeggios.
  23   */
  24 class Span_arpeggio_engraver : public Engraver
  25 {
  26 public:
  27   TRANSLATOR_DECLARATIONS (Span_arpeggio_engraver);
  28
  29 protected:
  30   virtual void acknowledge_grob (Grob_info);
  31   virtual void process_acknowledged_grobs ();
  32   virtual void stop_translation_timestep ();
  33
  34 private:
  35   Item *span_arpeggio_;
  36   Link_array<Grob> arpeggios_;
  37 };
  38
  39
  40 Span_arpeggio_engraver::Span_arpeggio_engraver ()
  41 {
  42   span_arpeggio_ = 0;
  43 }
  44
  45 void
  46 Span_arpeggio_engraver::acknowledge_grob (Grob_info info)
  47 {
  48   if (Arpeggio::has_interface (info.grob_)
  49       && info.origin_contexts (this).size ()) // huh? what's this test for?
  50     {
  51       arpeggios_.push (info.grob_);
  52     }
  53 }
  54
  55 void
  56 Span_arpeggio_engraver::process_acknowledged_grobs ()
  57 {
  58   /*
  59     connectArpeggios is slightly brusque; we should really read a grob
  60     property of the caught non-span arpeggios. That way, we can have
  61
  62     both non-connected and connected arps in one pianostaff.
  63
  64   */
  65   if (!span_arpeggio_ && arpeggios_.size () > 1
  66       && to_boolean (get_property ("connectArpeggios")))
  67     {
  68       span_arpeggio_ = make_item ("Arpeggio");
  69       announce_grob (span_arpeggio_, SCM_EOL);
  70     }
  71 }
  72
  73 void
  74 Span_arpeggio_engraver::stop_translation_timestep ()
  75 {
  76   if (span_arpeggio_)
  77     {
  78       /*
  79         we do this very late, to make sure we also catch `extra'
  80         side-pos support like accidentals.
  81        */
  82       for (int i=0; i < arpeggios_.size (); i ++)
  83         {
  84           for (SCM s = arpeggios_[i]->get_property ("stems");
  85                gh_pair_p (s); s = ly_cdr (s))
  86             Group_interface::add_thing (span_arpeggio_, ly_symbol2scm ("stems"), ly_car (s));
  87           for (SCM s = arpeggios_[i]->get_property ("side-support-elements");
  88                gh_pair_p (s); s = ly_cdr (s))
  89             Group_interface::add_thing (span_arpeggio_, ly_symbol2scm ("side-support-elements"), ly_car (s));
  90
  91           /*
  92             we can't kill the children, since we don't want to the
  93             previous note to bump into the span arpeggio; so we make
  94             it transparent.  */
  95           arpeggios_[i]->set_property ("print-function", SCM_EOL);
  96         }
  97
  98       typeset_grob (span_arpeggio_);
  99       span_arpeggio_ = 0;
 100     }
 101   arpeggios_.clear ();
 102 }
 103
 104
 105
 106 ENTER_DESCRIPTION (Span_arpeggio_engraver,
 107 /* descr */       "",
 108 /* creats*/       "Arpeggio",
 109 /* accepts */     "",
 110 /* acks  */      "arpeggio-interface",
 111 /* reads */       "connectArpeggios",
 112 /* write */       "");