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/*
vertical-align-grav.cc -- implement Vertical_align_engraver
source file of the GNU LilyPond music typesetter
(c) 1997--2000 Han-Wen Nienhuys <hanwen@cs.uu.nl>
*/
#include "translator-group.hh"
#include "paper-column.hh"
#include "align-interface.hh"
#include "span-bar.hh"
#include "axis-group-interface.hh"
#include "engraver.hh"
#include "spanner.hh"
class Vertical_align_engraver : public Engraver
{
Spanner * valign_p_;
bool qualifies_b (Grob_info) const;
public:
VIRTUAL_COPY_CONS(Translator);
Vertical_align_engraver();
protected:
virtual void acknowledge_grob (Grob_info);
virtual void initialize();
virtual void finalize();
};
Vertical_align_engraver::Vertical_align_engraver()
{
valign_p_ =0;
}
void
Vertical_align_engraver::initialize()
{
valign_p_ =new Spanner (get_property ("VerticalAlignment"));
valign_p_->set_bound(LEFT,unsmob_grob (get_property ("currentCommandColumn")));
announce_grob (valign_p_ , 0);
}
void
Vertical_align_engraver::finalize()
{
valign_p_->set_bound(RIGHT,unsmob_grob (get_property ("currentCommandColumn")));
typeset_grob (valign_p_);
valign_p_ =0;
}
bool
Vertical_align_engraver::qualifies_b (Grob_info i) const
{
int sz = i.origin_trans_l_arr ((Translator*)this).size() ;
return sz > 1 && Axis_group_interface::has_interface (i.elem_l_)
&& !i.elem_l_->parent_l (Y_AXIS) && Axis_group_interface::axis_b (i.elem_l_, Y_AXIS);
}
void
Vertical_align_engraver::acknowledge_grob (Grob_info i)
{
if (qualifies_b (i))
{
Align_interface::add_element (valign_p_,i.elem_l_);
}
}
ADD_THIS_TRANSLATOR(Vertical_align_engraver);
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