lily/score-priority-grav.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--1998 Han-Wen Nienhuys <hanwen@stack.nl>
   7 */
   8
   9
  10 #include "horizontal-group-item.hh"
  11 #include "score-priority-grav.hh"
  12 #include "item.hh"
  13 #include "assoc-iter.hh"
  14 #include "break-align-item.hh"
  15
  16
  17 Score_priority_engraver::Score_priority_engraver()
  18 {
  19 }
  20
  21 void
  22 Score_priority_engraver::do_pre_move_processing()
  23 {
  24   for (Assoc_iter<int, Horizontal_group_item*> i(align_p_assoc_); i.ok() ; i++)
  25     {
  26       if (i.val ())
  27         {
  28           typeset_element (i.val ());
  29           i.val () = 0;
  30         }
  31     }
  32   align_p_assoc_.clear ();
  33 }
  34
  35 void
  36 Score_priority_engraver::acknowledge_element (Score_elem_info inf)
  37 {
  38   Item * item_l = inf.elem_l_->item ();
  39   if (item_l && item_l->breakable_b_ && !item_l->empty_b ())
  40     {
  41       /*
  42         Don't try to eat up our (probable) parent.
  43       */
  44       if (inf.origin_grav_l_arr_.size () <= 1 &&
  45           item_l->is_type_b (Break_align_item::static_name ()))
  46         return;
  47
  48
  49       int priority =item_l->break_priority_i_;
  50       Horizontal_group_item * hg =0;
  51       if (!align_p_assoc_.elt_b(priority))
  52         {
  53           hg = new Horizontal_group_item;
  54           announce_element (Score_elem_info (hg,0));
  55           align_p_assoc_[priority] = hg;
  56           hg->break_priority_i_ = priority;
  57           hg->breakable_b_ = true;
  58         }
  59       else
  60         hg = align_p_assoc_[priority];
  61
  62       Score_elem * unbound_elem = inf.elem_l_;
  63
  64       while (unbound_elem->axis_group_l_a_[X_AXIS])
  65         {
  66           /* We might have added inf.elem_l_ earlier because we added one
  67              of its children.  We don't want to add ourselves to ourself
  68           */
  69           if (unbound_elem->axis_group_l_a_[X_AXIS] == hg)
  70             return;
  71           unbound_elem = unbound_elem->axis_group_l_a_[X_AXIS];
  72         }
  73
  74       hg->add_element (unbound_elem);
  75     }
  76 }
  77
  78 IMPLEMENT_IS_TYPE_B1(Score_priority_engraver, Engraver);
  79 ADD_THIS_TRANSLATOR(Score_priority_engraver);