lily/grace-position-engraver.cc

   1 /*
   2   grace-position-engraver.cc --  implement Grace_position_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1999 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7
   8  */
   9
  10 #include "engraver.hh"
  11 #include "grace-align-item.hh"
  12 #include "note-head.hh"
  13 #include "local-key-item.hh"
  14 #include "paper-column.hh"
  15 #include "dimension-cache.hh"
  16
  17 class Grace_position_engraver:public Engraver
  18 {
  19   Paper_column *last_musical_col_l_;
  20 protected:
  21   VIRTUAL_COPY_CONS(Translator);
  22   virtual void acknowledge_element (Score_element_info);
  23   virtual void process_acknowledged ();
  24   virtual void do_post_move_processing ();
  25   virtual void do_pre_move_processing ();
  26   Grace_align_item*align_l_;
  27   Link_array<Item> support_;
  28 public:
  29   Grace_position_engraver();
  30 };
  31
  32
  33 Grace_position_engraver::Grace_position_engraver ()
  34 {
  35   align_l_ =0;
  36   last_musical_col_l_ =0;
  37 }
  38
  39 void
  40 Grace_position_engraver::acknowledge_element (Score_element_info i)
  41 {
  42   if (Grace_align_item*g  =dynamic_cast<Grace_align_item*>(i.elem_l_))
  43     {
  44       align_l_ = g;
  45     }
  46   else if (Note_head * n = dynamic_cast <Note_head*> (i.elem_l_))
  47     {
  48       if (!to_boolean (n->get_elt_property ("grace")))
  49         support_.push (n);
  50     }
  51   else if (Local_key_item*it = dynamic_cast<Local_key_item*>(i.elem_l_))
  52     {
  53       if (!to_boolean (it->get_elt_property ("grace")))
  54         support_.push (it);
  55       else if (align_l_)
  56         it->add_dependency (align_l_);
  57     }
  58 }
  59
  60 void
  61 Grace_position_engraver::process_acknowledged ()
  62 {
  63   if (align_l_)
  64     {
  65       for (int i=0; i < support_.size (); i++)
  66         align_l_->add_support (support_[i]);
  67       support_.clear ();
  68     }
  69 }
  70
  71 void
  72 Grace_position_engraver::do_pre_move_processing ()
  73 {
  74   /*
  75      We don't have support. Either some moron tried attaching us to a rest,
  76      or we're at the end of the piece.  In the latter case, we have a
  77      problem if there are spanners in the grace section,
  78      they will want to  be broken into pieces (their line_l () field  is nil).
  79
  80      Solution: attach ourselves to  the last musical column known.  A little intricate.
  81
  82   */
  83   if (align_l_ && !align_l_->supported_b ())
  84     {
  85       Score_element * elt = align_l_->parent_l (X_AXIS);
  86       if (elt)
  87         return;
  88
  89       warning (_("Unattached grace notes.  Attaching to last musical column."));
  90       /*      if (ae)
  91         ae->remove_element (align_l_);
  92         else if (elt)*/
  93
  94
  95       align_l_->set_parent (0, X_AXIS);
  96       last_musical_col_l_->add_element (align_l_);
  97     }
  98
  99   last_musical_col_l_ = get_staff_info ().musical_pcol_l ();
 100 }
 101
 102 void
 103 Grace_position_engraver::do_post_move_processing ()
 104 {
 105   support_.clear ();
 106   align_l_ =0;
 107 }
 108
 109 ADD_THIS_TRANSLATOR(Grace_position_engraver);
 110