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--2001 Jan Nieuwenhuizen <janneke@gnu.org>
   7 */
   8
   9 #include "engraver.hh"
  10 #include "lily-guile.hh"
  11 #include "item.hh"
  12 #include "arpeggio.hh"
  13 #include "group-interface.hh"
  14 #include "side-position-interface.hh"
  15 #include "staff-symbol-referencer.hh"
  16
  17
  18 /**
  19   Make arpeggios that span multiple staffs.  Catch arpeggios, and span a
  20   Span_arpeggio over them if we find more than two arpeggios.
  21   */
  22 class Span_arpeggio_engraver : public Engraver
  23 {
  24 public:
  25   VIRTUAL_COPY_CONS (Translator);
  26   Span_arpeggio_engraver ();
  27
  28 protected:
  29   virtual void acknowledge_grob (Grob_info);
  30   virtual void create_grobs ();
  31   virtual void stop_translation_timestep ();
  32
  33 private:
  34   Item *span_arpeggio_;
  35   Link_array<Grob> arpeggios_;
  36 };
  37
  38
  39 Span_arpeggio_engraver::Span_arpeggio_engraver ()
  40 {
  41   span_arpeggio_ = 0;
  42 }
  43
  44 void
  45 Span_arpeggio_engraver::acknowledge_grob (Grob_info info)
  46 {
  47     if (info.origin_trans_l_arr (this).size ()
  48         && Arpeggio::has_interface (info.elem_l_))
  49     {
  50       arpeggios_.push (info.elem_l_);
  51     }
  52 }
  53
  54 void
  55 Span_arpeggio_engraver::create_grobs ()
  56 {
  57   /*
  58     connectArpeggios is slightly brusque; we should really read a elt
  59     property of the caught non-span arpeggios. That way, we can have
  60
  61     both non-connected and connected arps in one pianostaff.
  62
  63
  64   */
  65   if (!span_arpeggio_ && arpeggios_.size () > 1
  66       && to_boolean (get_property ("connectArpeggios")))
  67     {
  68       span_arpeggio_ = new Item (get_property ("Arpeggio"));
  69       announce_grob (span_arpeggio_, 0);
  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_grob_property ("stems");
  85                gh_pair_p (s); s = gh_cdr (s))
  86             Group_interface::add_thing (span_arpeggio_, "stems", gh_car (s));
  87           for (SCM s = arpeggios_[i]->get_grob_property ("side-support-elements");
  88                gh_pair_p (s); s = gh_cdr (s))
  89             Group_interface::add_thing (span_arpeggio_, "side-support-elements", gh_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_grob_property ("molecule-callback", SCM_BOOL_T);
  96         }
  97
  98       typeset_grob (span_arpeggio_);
  99       span_arpeggio_ = 0;
 100     }
 101   arpeggios_.clear ();
 102 }
 103
 104 ADD_THIS_TRANSLATOR (Span_arpeggio_engraver);
 105