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_))
97 Removed check for item->empty (X_AXIS). --hwn 20/1/04
99 if (item->get_parent (X_AXIS))
102 SCM bp=item->get_grob_property ("breakable");
103 bool breakable = (to_boolean (bp));
107 SCM align_name = item->get_grob_property ("break-align-symbol");
108 if (!gh_symbol_p (align_name))
113 align_ = make_item ("BreakAlignment");
115 announce_grob (align_, SCM_EOL);
117 edge_ = make_item ("LeftEdge");
118 add_to_group (edge_->get_grob_property ("break-align-symbol"), edge_);
119 announce_grob(edge_, SCM_EOL);
122 add_to_group (align_name, item);
127 Break_align_engraver::add_to_group(SCM align_name, Item*item)
129 SCM s = scm_assoc (align_name, column_alist_);
134 Grob *e = unsmob_grob (ly_cdr (s));
135 group = dynamic_cast<Item*> (e);
139 group = make_item ("BreakAlignGroup");
141 group->set_grob_property ("break-align-symbol", align_name);
142 group->set_parent (align_, Y_AXIS);
143 announce_grob(group, item->self_scm());
145 column_alist_ = scm_assoc_set_x (column_alist_, align_name, group->self_scm ());
148 Axis_group_interface::add_element (group, item);
151 ENTER_DESCRIPTION(Break_align_engraver,
152 /* descr */ "Align grobs with corresponding break-align-symbols into groups, and order the groups according to breakAlignOrder",
153 /* creats*/ "BreakAlignment BreakAlignGroup LeftEdge",
155 /* acks */ "break-aligned-interface"
156 ,/* reads */ "breakAlignOrder",