lily/score-priority-engraver.cc

   1 /*
   2   score-align-reg.cc -- implement Score_priority_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c)  1997--1999 Han-Wen Nienhuys <hanwen@cs.uu.nl>
   7 */
   8
   9
  10 #include "horizontal-group-item.hh"
  11 #include "score-priority-engraver.hh"
  12 #include "item.hh"
  13 #include "dictionary-iter.hh"
  14 #include "break-align-item.hh"
  15
  16
  17 Score_priority_engraver::Score_priority_engraver()
  18 {
  19   align_p_tab_.hash_func_ = int_hash;
  20 }
  21
  22 void
  23 Score_priority_engraver::do_pre_move_processing()
  24 {
  25   for (Hash_table_iter<int, Horizontal_group_item*> i(align_p_tab_);
  26        i.ok() ; i++)
  27     {
  28       if (i.val ())
  29         {
  30           typeset_element (i.val ());
  31           i.val_ref () = 0;
  32         }
  33     }
  34   align_p_tab_.clear ();
  35 }
  36
  37 void
  38 Score_priority_engraver::acknowledge_element (Score_element_info inf)
  39 {
  40   Item * item_l = dynamic_cast <Item *> (inf.elem_l_);
  41   if (item_l && item_l->breakable_b_ && !item_l->empty_b ())
  42     {
  43       /*
  44         Don't try to eat up our (probable) parent.
  45       */
  46       if (inf.origin_grav_l_arr_.size () <= 1 &&
  47           dynamic_cast<Break_align_item *> (item_l))
  48         return;
  49
  50
  51       int priority =item_l->break_priority_i_;
  52       Horizontal_group_item * hg =0;
  53       if (!align_p_tab_.elem_b(priority))
  54         {
  55           hg = new Horizontal_group_item;
  56           announce_element (Score_element_info (hg,0));
  57           align_p_tab_[priority] = hg;
  58           hg->break_priority_i_ = priority;
  59           hg->breakable_b_ = true;
  60         }
  61       else
  62         hg = align_p_tab_[priority];
  63
  64       Score_element * unbound_elem = inf.elem_l_;
  65
  66       /*
  67         ugh
  68        */
  69       while (unbound_elem->parent_l (X_AXIS))
  70         {
  71           /* We might have added inf.elem_l_ earlier because we added one
  72              of its children.  We don't want to add ourselves to ourself
  73           */
  74           Graphical_element * e = unbound_elem->parent_l (X_AXIS);
  75           if (e == hg)
  76             return;
  77           unbound_elem = dynamic_cast<Score_element*> (e);
  78         }
  79
  80       hg->add_element (unbound_elem);
  81     }
  82 }
  83
  84
  85 ADD_THIS_TRANSLATOR(Score_priority_engraver);