lily/vertical-align-grav.cc

   1 /*
   2   vertical-align-grav.cc -- implement Vertical_align_engraver
   3
   4   source file of the GNU LilyPond music typesetter
   5
   6   (c) 1997 Han-Wen Nienhuys <hanwen@stack.nl>
   7 */
   8
   9
  10 #include "vertical-align-grav.hh"
  11 #include "vertical-align-spanner.hh"
  12
  13 Vertical_align_engraver::Vertical_align_engraver()
  14 {
  15     valign_p_ =0;
  16 }
  17
  18 void
  19 Vertical_align_engraver::do_creation_processing()
  20 {
  21     valign_p_ =new Vertical_align_spanner;
  22     valign_p_->left_col_l_ = get_staff_info().command_pcol_l() ;
  23     announce_element( Score_elem_info( valign_p_ , 0 ));
  24 }
  25
  26 void
  27 Vertical_align_engraver::do_removal_processing()
  28 {
  29     valign_p_->right_col_l_ = get_staff_info().command_pcol_l();
  30     typeset_element( valign_p_);
  31     valign_p_ =0;
  32 }
  33
  34 void
  35 Vertical_align_engraver::acknowledge_element(Score_elem_info i)
  36 {
  37     if ( i.origin_grav_l_arr_.size() == 2 &&
  38          i.elem_l_->is_type_b(Vertical_group_element::static_name()) &&
  39          !i.elem_l_->axis_group_l_a_[Y_AXIS]   ) {
  40         assert( !valign_p_->contains_b(  i.elem_l_) );
  41
  42         valign_p_->add ( i.elem_l_ );
  43     }
  44 }
  45
  46
  47 IMPLEMENT_IS_TYPE_B1(Vertical_align_engraver, Engraver);
  48 ADD_THIS_ENGRAVER(Vertical_align_engraver);