2 break-align-engraver.cc -- implement Break_align_engraver
4 source file of the GNU LilyPond music typesetter
6 (c) 1999--2003 Han-Wen Nienhuys <hanwen@cs.uu.nl>
10 #include "protected-scm.hh"
11 #include "break-align-interface.hh"
13 #include "align-interface.hh"
14 #include "axis-group-interface.hh"
17 class Break_align_engraver
: public Engraver
20 Protected_scm column_alist_
;
23 void add_to_group (SCM
,Item
*);
25 virtual void finalize ();
26 virtual void acknowledge_grob (Grob_info i
);
27 virtual void stop_translation_timestep ();
28 void add_column (SCM
);
31 TRANSLATOR_DECLARATIONS(Break_align_engraver
);
35 Break_align_engraver::add_column (SCM smob
)
37 Grob
* e
= unsmob_grob (smob
);
38 Break_align_interface::add_element (align_
,e
);
43 Break_align_engraver::finalize ()
45 column_alist_
= SCM_EOL
;
49 Break_align_engraver::stop_translation_timestep ()
51 SCM order
= get_property ("breakAlignOrder");
52 for (; gh_pair_p (order
); order
= ly_cdr (order
))
54 SCM p
= scm_assoc (ly_car (order
), column_alist_
);
57 add_column (ly_cdr (p
));
58 column_alist_
= scm_assoc_remove_x (column_alist_
, ly_car (order
));
62 for (SCM p
= column_alist_
; gh_pair_p (p
); p
= ly_cdr (p
))
64 SCM pair
= ly_car (p
);
65 add_column (ly_cdr (pair
));
69 column_alist_
= SCM_EOL
;
73 typeset_grob (align_
);
84 Break_align_engraver::Break_align_engraver ()
86 column_alist_
= SCM_EOL
;
92 Break_align_engraver::acknowledge_grob (Grob_info inf
)
94 if (Item
* item
= dynamic_cast <Item
*> (inf
.grob_
))
96 if (item
->empty_b (X_AXIS
) || item
->get_parent (X_AXIS
))
99 SCM bp
=item
->get_grob_property ("breakable");
100 bool breakable
= (to_boolean (bp
));
104 SCM align_name
= item
->get_grob_property ("break-align-symbol");
105 if (!gh_symbol_p (align_name
))
110 align_
= new Item (get_property ("BreakAlignment"));
112 announce_grob (align_
, SCM_EOL
);
114 edge_
= new Item (get_property ("LeftEdge"));
115 add_to_group (edge_
->get_grob_property ("break-align-symbol"), edge_
);
116 announce_grob(edge_
, SCM_EOL
);
119 add_to_group (align_name
, item
);
124 Break_align_engraver::add_to_group(SCM align_name
, Item
*item
)
126 SCM s
= scm_assoc (align_name
, column_alist_
);
131 Grob
*e
= unsmob_grob (ly_cdr (s
));
132 group
= dynamic_cast<Item
*> (e
);
136 group
= new Item (get_property ("BreakAlignGroup"));
138 group
->set_grob_property ("break-align-symbol", align_name
);
139 group
->set_parent (align_
, Y_AXIS
);
140 announce_grob(group
, item
->self_scm());
142 column_alist_
= scm_assoc_set_x (column_alist_
, align_name
, group
->self_scm ());
145 Axis_group_interface::add_element (group
, item
);
148 ENTER_DESCRIPTION(Break_align_engraver
,
149 /* descr */ "Align grobs with corresponding break-align-symbols into groups, and order the groups according to breakAlignOrder",
150 /* creats*/ "BreakAlignment BreakAlignGroup LeftEdge",
152 /* acks */ "break-aligned-interface"
153 ,/* reads */ "breakAlignOrder",