2 grace-position-engraver.cc -- implement Grace_position_engraver
4 source file of the GNU LilyPond music typesetter
6 (c) 1999 Han-Wen Nienhuys <hanwen@cs.uu.nl>
10 #include "engraver.hh"
11 #include "grace-align-item.hh"
12 #include "note-head.hh"
13 #include "local-key-item.hh"
14 #include "paper-column.hh"
15 #include "dimension-cache.hh"
17 class Grace_position_engraver:public Engraver
19 Paper_column *last_musical_col_l_;
21 VIRTUAL_COPY_CONS(Translator);
22 virtual void acknowledge_element (Score_element_info);
23 virtual void process_acknowledged ();
24 virtual void do_post_move_processing ();
25 virtual void do_pre_move_processing ();
26 Grace_align_item*align_l_;
27 Link_array<Item> support_;
29 Grace_position_engraver();
33 Grace_position_engraver::Grace_position_engraver ()
36 last_musical_col_l_ =0;
40 Grace_position_engraver::acknowledge_element (Score_element_info i)
42 if (Grace_align_item*g =dynamic_cast<Grace_align_item*>(i.elem_l_))
46 else if (Note_head * n = dynamic_cast <Note_head*> (i.elem_l_))
48 if (!to_boolean (n->get_elt_property ("grace")))
51 else if (Local_key_item*it = dynamic_cast<Local_key_item*>(i.elem_l_))
53 if (!to_boolean (it->get_elt_property ("grace")))
56 it->add_dependency (align_l_);
61 Grace_position_engraver::process_acknowledged ()
65 for (int i=0; i < support_.size (); i++)
66 align_l_->add_support (support_[i]);
72 Grace_position_engraver::do_pre_move_processing ()
75 We don't have support. Either some moron tried attaching us to a rest,
76 or we're at the end of the piece. In the latter case, we have a
77 problem if there are spanners in the grace section,
78 they will want to be broken into pieces (their line_l () field is nil).
80 Solution: attach ourselves to the last musical column known. A little intricate.
83 if (align_l_ && !align_l_->supported_b ())
85 Score_element * elt = align_l_->parent_l (X_AXIS);
89 warning (_("Unattached grace notes. Attaching to last musical column."));
91 ae->remove_element (align_l_);
95 align_l_->set_parent (0, X_AXIS);
96 last_musical_col_l_->add_element (align_l_);
99 last_musical_col_l_ = get_staff_info ().musical_pcol_l ();
103 Grace_position_engraver::do_post_move_processing ()
109 ADD_THIS_TRANSLATOR(Grace_position_engraver);