2 break-align-engraver.cc -- implement Break_align_engraver
4 source file of the GNU LilyPond music typesetter
6 (c) 1999--2004 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 for (SCM p = column_alist_; ly_pair_p (p); p = ly_cdr (p))
53 SCM pair = ly_car (p);
54 add_column (ly_cdr (pair));
56 column_alist_ = SCM_EOL;
60 typeset_grob (align_);
65 typeset_grob (left_edge_);
71 Break_align_engraver::Break_align_engraver ()
73 column_alist_ = SCM_EOL;
79 Break_align_engraver::acknowledge_grob (Grob_info inf)
81 if (Item * item = dynamic_cast <Item *> (inf.grob_))
84 Removed check for item->empty (X_AXIS). --hwn 20/1/04
86 if (item->get_parent (X_AXIS))
89 SCM bp=item->get_property ("breakable");
90 bool breakable = (to_boolean (bp));
94 SCM align_name = item->get_property ("break-align-symbol");
95 if (!ly_symbol_p (align_name))
100 align_ = make_item ("BreakAlignment");
102 announce_grob (align_, SCM_EOL);
104 Context*origin = inf.origin_contexts (this)[0];
105 left_edge_ = make_item_from_properties (origin,
106 ly_symbol2scm ("LeftEdge"));
107 add_to_group (left_edge_->get_property ("break-align-symbol"),
109 announce_grob (left_edge_, SCM_EOL);
112 add_to_group (align_name, item);
117 Break_align_engraver::add_to_group (SCM align_name, Item*item)
119 SCM s = scm_assoc (align_name, column_alist_);
124 Grob *e = unsmob_grob (ly_cdr (s));
125 group = dynamic_cast<Item*> (e);
129 group = make_item ("BreakAlignGroup");
131 group->set_property ("break-align-symbol", align_name);
132 group->set_parent (align_, Y_AXIS);
133 announce_grob (group, item->self_scm ());
135 column_alist_ = scm_assoc_set_x (column_alist_, align_name, group->self_scm ());
138 Axis_group_interface::add_element (group, item);
141 ENTER_DESCRIPTION (Break_align_engraver,
142 "Align grobs with corresponding @code{break-align-symbols} into "
143 "groups, and order the groups according to @code{breakAlignOrder}. "
144 "The left edge of the alignment gets a separate group, with a symbol @code{left-edge}. "
146 /* creats*/ "BreakAlignment BreakAlignGroup LeftEdge",
148 /* acks */ "break-aligned-interface",