lily/bar-script-engraver.cc

   1 /*
   2   bar-script-engraver.cc --  implement Bar_script_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 "bar-script-engraver.hh"
  11 #include "bar.hh"
  12 #include "clef-item.hh"
  13 #include "side-position-interface.hh"
  14 #include "text-item.hh"
  15 #include "lily-guile.hh"
  16 #include "paper-column.hh"
  17 #include "paper-def.hh"
  18 #include "dimension-cache.hh"
  19
  20
  21 Bar_script_engraver::Bar_script_engraver ()
  22 {
  23   axis_ = Y_AXIS;
  24   text_p_ =0;
  25   hang_on_clef_b_ = false;
  26   visibility_lambda_
  27     = ly_eval_str ("non-postbreak-visibility");
  28 }
  29
  30 void
  31 Bar_script_engraver::do_creation_processing ()
  32 {
  33   SCM prop = get_property (type_ + "HangOnClef", 0);
  34   if (to_boolean (prop))
  35     {
  36       hang_on_clef_b_ = true;
  37     }
  38 }
  39
  40 /*
  41   Some interesting item came across.  Lets attach the text and the
  42   positioner to the item.
  43
  44 */
  45
  46 void
  47 Bar_script_engraver::attach_script_to_item (Item *i)
  48 {
  49   Axis other_axis = Axis((axis_ + 1)%2);
  50   if (text_p_ && !text_p_->parent_l(other_axis))
  51     {
  52       text_p_->set_parent (i,other_axis);
  53       text_p_->set_parent (i,axis_);
  54
  55       if (!text_p_->parent_l(other_axis))
  56         text_p_->set_parent (i,other_axis);
  57
  58       Side_position_interface (text_p_).add_support (i);
  59
  60       /*
  61         How do we make sure that text_p_ has a dependency from
  62         someone else? We can't use I for that,  so we use some other element.
  63        */
  64       // text_p_->set_elt_property ("dangling", SCM_BOOL_T)
  65       get_staff_info ().command_pcol_l ()->add_dependency (text_p_);
  66     }
  67 }
  68
  69 /*
  70   URG.
  71  */
  72 Item*
  73 Bar_script_engraver::cast_to_interesting_item (Score_element *e)
  74 {
  75   Item * i =0;
  76   if (hang_on_clef_b_)
  77     {
  78       Clef_item * c = dynamic_cast<Clef_item*> (e);
  79
  80
  81       // urg.
  82       if (c) //  && c->default_b_)
  83         {
  84           i = c;
  85         }
  86     }
  87   else
  88     {
  89       i = dynamic_cast<Bar*> (e);
  90     }
  91   return i;
  92 }
  93
  94 void
  95 Bar_script_engraver::acknowledge_element (Score_element_info inf)
  96 {
  97   if (inf.origin_trans_l_arr_.size () == 1)
  98     {
  99       Item *i=cast_to_interesting_item (inf.elem_l_);
 100       if (!i)
 101         return;
 102
 103       /* Only put numbers on bars that are at our own level (don't put
 104          numbers over the staffs of a GrandStaff, only over the GrandStaff
 105          itself */
 106       if (inf.origin_trans_l_arr_.size () != 1)
 107         return;
 108
 109       attach_script_to_item (i);
 110     }
 111 }
 112
 113 void
 114 Bar_script_engraver::do_pre_move_processing ()
 115 {
 116   if (text_p_)
 117     {
 118       typeset_element (text_p_);
 119       text_p_ =0;
 120     }
 121 }
 122
 123
 124 void
 125 Bar_script_engraver::create_items (Request *rq)
 126 {
 127   if (text_p_)
 128     return;
 129
 130   text_p_ = new Text_item;
 131   text_p_->set_elt_property ("breakable", SCM_BOOL_T); // ugh
 132   Side_position_interface staffside(text_p_);
 133   staffside.set_axis (axis_);
 134
 135   SCM prop = get_property (type_ + "Direction", 0);
 136   if (!isdir_b (prop))
 137     {
 138       prop = gh_int2scm (UP);
 139     }
 140   text_p_->set_elt_property ("direction", prop);
 141
 142   SCM padding = get_property (type_ + "ScriptPadding", 0);
 143   if (gh_number_p(padding))
 144     {
 145       text_p_->set_elt_property ("padding", padding);
 146     }
 147   else
 148     {
 149       text_p_
 150         ->set_elt_property ("padding",
 151                             gh_double2scm(paper_l ()->get_var ("interline")));
 152     }
 153
 154   text_p_->set_elt_property ("visibility-lambda",
 155                              visibility_lambda_);
 156
 157   announce_element (Score_element_info (text_p_, rq));
 158 }
 159