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"
16 #include "translator-group.hh"
18 class Break_align_engraver : public Engraver
24 void add_to_group (SCM,Item*);
26 virtual void acknowledge_grob (Grob_info i);
27 virtual void stop_translation_timestep ();
28 virtual void derived_mark () const;
29 void add_column (SCM);
32 TRANSLATOR_DECLARATIONS (Break_align_engraver);
36 Break_align_engraver::add_column (SCM smob)
38 Grob * e = unsmob_grob (smob);
39 Break_align_interface::add_element (align_,e);
44 Break_align_engraver::stop_translation_timestep ()
46 for (SCM p = column_alist_; scm_is_pair (p); p = scm_cdr (p))
48 SCM pair = scm_car (p);
49 add_column (scm_cdr (pair));
51 column_alist_ = SCM_EOL;
58 Break_align_engraver::Break_align_engraver ()
60 column_alist_ = SCM_EOL;
66 Break_align_engraver::derived_mark () const
68 scm_gc_mark (column_alist_);
72 Break_align_engraver::acknowledge_grob (Grob_info inf)
74 if (Item * item = dynamic_cast <Item *> (inf.grob_))
77 Removed check for item->empty (X_AXIS). --hwn 20/1/04
79 if (item->get_parent (X_AXIS))
82 SCM bp=item->get_property ("breakable");
83 bool breakable = (to_boolean (bp));
87 SCM align_name = item->get_property ("break-align-symbol");
88 if (!scm_is_symbol (align_name))
93 align_ = make_item ("BreakAlignment", SCM_EOL);
97 Context*origin = inf.origin_contexts (this)[0];
98 left_edge_ = make_item_from_properties (origin->implementation (),
99 ly_symbol2scm ("LeftEdge"),
102 add_to_group (left_edge_->get_property ("break-align-symbol"),
106 add_to_group (align_name, item);
111 Break_align_engraver::add_to_group (SCM align_name, Item*item)
113 SCM s = scm_assoc (align_name, column_alist_);
118 Grob *e = unsmob_grob (scm_cdr (s));
119 group = dynamic_cast<Item*> (e);
123 group = make_item ("BreakAlignGroup", item->self_scm () );
125 group->set_property ("break-align-symbol", align_name);
126 group->set_parent (align_, Y_AXIS);
128 column_alist_ = scm_assoc_set_x (column_alist_, align_name, group->self_scm ());
131 Axis_group_interface::add_element (group, item);
134 ENTER_DESCRIPTION (Break_align_engraver,
135 "Align grobs with corresponding @code{break-align-symbols} into "
136 "groups, and order the groups according to @code{breakAlignOrder}. "
137 "The left edge of the alignment gets a separate group, with a symbol @code{left-edge}. "
139 /* creats*/ "BreakAlignment BreakAlignGroup LeftEdge",
141 /* acks */ "break-aligned-interface",