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 class Break_align_engraver : public Engraver
22 void add_to_group (SCM, Item *);
24 virtual void acknowledge_grob (Grob_info i);
25 virtual void stop_translation_timestep ();
26 virtual void derived_mark () const;
27 void add_column (SCM);
30 TRANSLATOR_DECLARATIONS (Break_align_engraver);
34 Break_align_engraver::add_column (SCM smob)
36 Grob *e = unsmob_grob (smob);
37 Break_align_interface::add_element (align_, e);
42 Break_align_engraver::stop_translation_timestep ()
44 for (SCM p = column_alist_; scm_is_pair (p); p = scm_cdr (p))
46 SCM pair = scm_car (p);
47 add_column (scm_cdr (pair));
49 column_alist_ = SCM_EOL;
55 Break_align_engraver::Break_align_engraver ()
57 column_alist_ = SCM_EOL;
63 Break_align_engraver::derived_mark () const
65 scm_gc_mark (column_alist_);
69 Break_align_engraver::acknowledge_grob (Grob_info inf)
71 if (Item *item = dynamic_cast<Item *> (inf.grob_))
74 Removed check for item->empty (X_AXIS). --hwn 20/1/04
76 if (item->get_parent (X_AXIS))
79 SCM bp = item->get_property ("breakable");
80 bool breakable = (to_boolean (bp));
84 SCM align_name = item->get_property ("break-align-symbol");
85 if (!scm_is_symbol (align_name))
90 align_ = make_item ("BreakAlignment", SCM_EOL);
92 Context *origin = inf.origin_contexts (this)[0];
93 left_edge_ = make_item_from_properties (dynamic_cast<Engraver *> (origin->implementation ()),
94 ly_symbol2scm ("LeftEdge"),
97 add_to_group (left_edge_->get_property ("break-align-symbol"),
101 add_to_group (align_name, item);
106 Break_align_engraver::add_to_group (SCM align_name, Item *item)
108 SCM s = scm_assoc (align_name, column_alist_);
113 Grob *e = unsmob_grob (scm_cdr (s));
114 group = dynamic_cast<Item *> (e);
118 group = make_item ("BreakAlignGroup", item->self_scm ());
120 group->set_property ("break-align-symbol", align_name);
121 group->set_parent (align_, Y_AXIS);
123 column_alist_ = scm_assoc_set_x (column_alist_, align_name, group->self_scm ());
126 Axis_group_interface::add_element (group, item);
129 ADD_TRANSLATOR (Break_align_engraver,
130 "Align grobs with corresponding @code{break-align-symbols} into "
131 "groups, and order the groups according to @code{breakAlignOrder}. "
132 "The left edge of the alignment gets a separate group, with a symbol @code{left-edge}. ",
133 /* creats*/ "BreakAlignment BreakAlignGroup LeftEdge",
135 /* acks */ "break-aligned-interface",