lily/score-walker.cc

   1 /*
   2   score-walker.cc -- implement Score_walker
   3
   4   source file of the LilyPond music typesetter
   5
   6   (c) 1997 Han-Wen Nienhuys <hanwen@stack.nl>
   7 */
   8 #include "proto.hh"
   9 #include "plist.hh"
  10 #include "debug.hh"
  11 #include "score-walker.hh"
  12 #include "score.hh"
  13 #include "staff-walker.hh"
  14 #include "staff.hh"
  15 #include "score-column.hh"
  16
  17 Score_walker::Score_walker(Score *s)
  18     :PCursor<Score_column *> (s->cols_)
  19 {
  20     score_l_ = s;
  21     for (iter_top(s->staffs_,i); i.ok(); i++) {
  22         Staff_walker* w_p=i->get_walker_p();
  23         w_p->score_walk_l_ =this;
  24         walker_p_arr_.push(w_p);
  25     }
  26
  27     if(ok()) {
  28         s->find_col(0, false)->set_breakable();
  29         s->find_col(s->last(), false)->set_breakable();
  30     }
  31     reinit();
  32 }
  33
  34
  35 void
  36 Score_walker::reinit()
  37 {
  38     disallow_break_walk_l_arr = walker_p_arr_;
  39     disallow_break_count_ = disallow_break_walk_l_arr.size();
  40 }
  41
  42
  43 /** Advance the cursor, and all Staff_walkers contained in this. Reset
  44   runtime fields */
  45 void
  46 Score_walker::operator ++(int )
  47 {
  48     Moment last = ptr()->when();
  49
  50     PCursor<Score_column *>::operator++(0);
  51     if (ok() && ptr()->when() == last)
  52         PCursor<Score_column *>::operator++(0);
  53     reinit();
  54     bool last_b =  (!ok());     // urgh
  55     for (int i=0; i< walker_p_arr_.size(); i++) {
  56         if (walker_p_arr_[i]->ok() &&
  57             (last_b || walker_p_arr_[i]->when() < when())) {
  58
  59             walker_p_arr_[i]->operator++(0);
  60         }
  61     }
  62 }
  63
  64 /** Allow the command_column to be breakable for one staff. If all
  65   staffs allow, then allow a break here.  */
  66 void
  67 Score_walker::allow_break(Staff_walker*w)
  68 {
  69     for (int i=0; i < disallow_break_walk_l_arr.size(); i++) {
  70         if (w == disallow_break_walk_l_arr[i]) {
  71             disallow_break_count_ --;
  72             disallow_break_walk_l_arr[i] =0;
  73
  74             if (!disallow_break_count_) {
  75                 PCursor<Score_column*> col_cursor = *this;
  76                 if (ptr()->musical_b())
  77                     col_cursor --;
  78                 col_cursor->set_breakable();
  79             }
  80         }
  81     }
  82 }
  83
  84 bool
  85 Score_walker::break_allowed_b()
  86 {
  87     return !disallow_break_count_;
  88 }
  89
  90 Moment
  91 Score_walker::when()
  92 {
  93     return ptr()->when();
  94 }
  95
  96 void
  97 Score_walker::process()
  98 {
  99     for (int i=0; i < walker_p_arr_.size(); i++) {
 100         Staff_walker *w = walker_p_arr_[i];
 101         if ( w->ok() && w->when() == when() ) {
 102             walker_p_arr_[i]->process();
 103         }
 104     }
 105     if (when().denominator() == 1) {
 106         *mlog << "." <<flush;
 107     }
 108 }
 109
 110 Score_walker::~Score_walker()
 111 {
 112     for (int i=0; i < walker_p_arr_.size(); i++)
 113         delete walker_p_arr_[i];
 114     assert( !score_l_->find_col(score_l_->last(), true)->used_b());
 115 }
 116
 117