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--2009 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 #include "item.hh"
  17
  18 /**
  19    Make arpeggios that span multiple staves.  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   TRANSLATOR_DECLARATIONS (Span_arpeggio_engraver);
  26   DECLARE_ACKNOWLEDGER (arpeggio);
  27
  28 protected:
  29   void process_acknowledged ();
  30   void stop_translation_timestep ();
  31
  32 private:
  33   Item *span_arpeggio_;
  34   vector<Grob*> arpeggios_;
  35 };
  36
  37 Span_arpeggio_engraver::Span_arpeggio_engraver ()
  38 {
  39   span_arpeggio_ = 0;
  40 }
  41
  42 void
  43 Span_arpeggio_engraver::acknowledge_arpeggio (Grob_info info)
  44 {
  45   if (info.origin_contexts (this).size ()) // huh? what's this test for?
  46     arpeggios_.push_back (info.grob ());
  47 }
  48
  49 void
  50 Span_arpeggio_engraver::process_acknowledged ()
  51 {
  52   /*
  53     connectArpeggios is slightly brusque; we should really read a grob
  54     property of the caught non-span arpeggios. That way, we can have
  55
  56     both non-connected and connected arps in one pianostaff.
  57
  58   */
  59   if (!span_arpeggio_ && arpeggios_.size () > 1
  60       && to_boolean (get_property ("connectArpeggios")))
  61     {
  62       span_arpeggio_ = make_item ("Arpeggio", SCM_EOL);
  63       span_arpeggio_->set_property ("cross-staff", SCM_BOOL_T);
  64     }
  65 }
  66
  67 void
  68 Span_arpeggio_engraver::stop_translation_timestep ()
  69 {
  70   if (span_arpeggio_)
  71     {
  72       /*
  73         we do this very late, to make sure we also catch `extra'
  74         side-pos support like accidentals.
  75       */
  76       for (vsize j = 0; j < arpeggios_.size (); j++)
  77         {
  78           extract_grob_set (arpeggios_[j], "stems", stems);
  79           for (vsize i = 0; i < stems.size (); i++)
  80             Pointer_group_interface::add_grob (span_arpeggio_, ly_symbol2scm ("stems"),
  81                                                stems[i]);
  82
  83           extract_grob_set (arpeggios_[j], "side-support-elements", sses);
  84           for (vsize i = 0; i < sses.size (); i++)
  85             Pointer_group_interface::add_grob (span_arpeggio_, ly_symbol2scm ("side-support-elements"),
  86                                                sses[i]);
  87
  88           /*
  89             we can't kill the children, since we don't want to the
  90             previous note to bump into the span arpeggio; so we make
  91             it transparent.  */
  92           arpeggios_[j]->set_property ("transparent", SCM_BOOL_T);
  93         }
  94
  95
  96       span_arpeggio_->set_parent (arpeggios_[0]->get_parent (Y_AXIS), Y_AXIS);
  97       span_arpeggio_ = 0;
  98     }
  99   arpeggios_.clear ();
 100 }
 101
 102 #include "translator.icc"
 103
 104 ADD_ACKNOWLEDGER (Span_arpeggio_engraver, arpeggio);
 105 ADD_TRANSLATOR (Span_arpeggio_engraver,
 106                 /* doc */
 107                 "Make arpeggios that span multiple staves.",
 108
 109                 /* create */
 110                 "Arpeggio ",
 111
 112                 /* read */
 113                 "connectArpeggios ",
 114
 115                 /* write */
 116                 ""
 117                 );