2 break-align-engraver.cc -- implement Break_align_engraver
4 source file of the GNU LilyPond music typesetter
6 (c) 1999--2005 Han-Wen Nienhuys <hanwen@cs.uu.nl>
9 #include "protected-scm.hh"
10 #include "break-align-interface.hh"
11 #include "align-interface.hh"
12 #include "axis-group-interface.hh"
14 #include "translator-group.hh"
16 #include "translator.icc"
18 class Break_align_engraver : public Engraver
24 void add_to_group (SCM, Item *);
26 PRECOMPUTED_VIRTUAL void stop_translation_timestep ();
27 virtual void derived_mark () const;
29 TRANSLATOR_DECLARATIONS (Break_align_engraver);
30 DECLARE_ACKNOWLEDGER(break_aligned);
35 Break_align_engraver::stop_translation_timestep ()
37 column_alist_ = SCM_EOL;
43 Break_align_engraver::Break_align_engraver ()
45 column_alist_ = SCM_EOL;
51 Break_align_engraver::derived_mark () const
53 scm_gc_mark (column_alist_);
57 Break_align_engraver::acknowledge_break_aligned (Grob_info inf)
59 if (Item *item = dynamic_cast<Item *> (inf.grob ()))
62 Removed check for item->empty (X_AXIS). --hwn 20/1/04
64 if (item->get_parent (X_AXIS))
67 SCM bp = item->get_property ("breakable");
68 bool breakable = (to_boolean (bp));
72 SCM align_name = item->get_property ("break-align-symbol");
73 if (!scm_is_symbol (align_name))
78 align_ = make_item ("BreakAlignment", SCM_EOL);
80 Context *origin = inf.origin_contexts (this)[0];
82 Translator_group *tg = origin ->implementation ();
83 Engraver *random_source = dynamic_cast<Engraver*> (unsmob_translator (scm_car (tg->get_simple_trans_list ())));
86 Make left edge appear to come from same context as clef/bar-line etc.
88 left_edge_ = make_item_from_properties (random_source,
89 ly_symbol2scm ("LeftEdge"),
92 add_to_group (left_edge_->get_property ("break-align-symbol"),
96 add_to_group (align_name, item);
101 Break_align_engraver::add_to_group (SCM align_name, Item *item)
103 SCM s = scm_assoc (align_name, column_alist_);
108 Grob *e = unsmob_grob (scm_cdr (s));
109 group = dynamic_cast<Item *> (e);
113 group = make_item ("BreakAlignGroup", item->self_scm ());
115 group->set_property ("break-align-symbol", align_name);
116 group->set_parent (align_, Y_AXIS);
118 column_alist_ = scm_assoc_set_x (column_alist_, align_name, group->self_scm ());
120 Break_align_interface::add_element (align_, group);
122 Axis_group_interface::add_element (group, item);
124 ADD_ACKNOWLEDGER(Break_align_engraver, break_aligned);
125 ADD_TRANSLATOR (Break_align_engraver,
126 "Align grobs with corresponding @code{break-align-symbols} into "
127 "groups, and order the groups according to @code{breakAlignOrder}. "
128 "The left edge of the alignment gets a separate group, with a symbol @code{left-edge}. ",
129 /* creats*/ "BreakAlignment BreakAlignGroup LeftEdge",