2 break-align-interface.cc -- implement Break_align_interface
4 source file of the GNU LilyPond music typesetter
6 (c) 1997--2005 Han-Wen Nienhuys <hanwen@cs.uu.nl>
10 #include "break-align-interface.hh"
12 #include "pointer-group-interface.hh"
13 #include "self-alignment-interface.hh"
14 #include "side-position-interface.hh"
15 #include "axis-group-interface.hh"
17 #include "dimensions.hh"
18 #include "output-def.hh"
19 #include "paper-column.hh"
20 #include "align-interface.hh"
23 MAKE_SCHEME_CALLBACK (Break_align_interface, self_align_callback, 2);
25 Break_align_interface::self_align_callback (SCM element_smob, SCM axis)
27 Grob *me = unsmob_grob (element_smob);
29 assert (scm_to_int (axis) == X_AXIS);
31 Item *item = dynamic_cast<Item *> (me);
32 Direction bsd = item->break_status_dir ();
34 me->set_property ("self-alignment-X", scm_from_int (RIGHT));
37 Force break alignment itself to be done first, in the case
39 return Self_alignment_interface::aligned_on_self (element_smob, axis);
43 This is tricky: we cannot modify 'elements, since callers are
44 iterating the same list. Reordering the list in-place, or resetting
45 'elements will skip elements in the loops of callers.
47 So we return the correct order as an array.
50 Break_align_interface::ordered_elements (Grob *grob)
52 Item *me = dynamic_cast<Item *> (grob);
53 extract_grob_set (me, "elements", elts);
55 SCM order_vec = me->get_property ("break-align-orders");
56 if (!scm_is_vector (order_vec)
57 || scm_c_vector_length (order_vec) < 3)
60 Link_array<Grob> writable_elts (elts);
61 SCM order = scm_vector_ref (order_vec,
62 scm_from_int (me->break_status_dir () + 1));
65 Copy in order specified in BREAK-ALIGN-ORDER.
67 Link_array<Grob> new_elts;
68 for (; scm_is_pair (order); order = scm_cdr (order))
70 SCM sym = scm_car (order);
72 for (int i = writable_elts.size (); i--;)
74 Grob *g = writable_elts[i];
75 if (g && sym == g->get_property ("break-align-symbol"))
78 writable_elts.del (i);
87 Break_align_interface::add_element (Grob *me, Grob *toadd)
89 Align_interface::add_element (me, toadd);
92 MAKE_SCHEME_CALLBACK(Break_align_interface, calc_positioning_done, 1)
94 Break_align_interface::calc_positioning_done (SCM smob)
96 Grob *grob = unsmob_grob (smob);
97 Item *me = dynamic_cast<Item *> (grob);
99 Link_array<Grob> elems = ordered_elements (me);
100 Array<Interval> extents;
102 int last_nonempty = -1;
103 for (int i = 0; i < elems.size (); i++)
105 Interval y = elems[i]->extent (elems[i], X_AXIS);
112 while (idx < extents.size () && extents[idx].is_empty ())
116 offsets.set_size (elems.size ());
117 for (int i = 0; i < offsets.size ();i++)
120 Real extra_right_space = 0.0;
122 while (idx < elems.size ())
124 int next_idx = idx + 1;
125 while (next_idx < elems.size ()
126 && extents[next_idx].is_empty ())
129 Grob *l = elems[idx];
132 if (next_idx < elems.size ())
138 Find the first grob with a space-alist entry.
140 extract_grob_set (l, "elements", elts);
142 for (int i = elts.size (); i--;)
147 && elt->get_property ("break-align-symbol")
148 == ly_symbol2scm ("left-edge"))
151 SCM l = elt->get_property ("space-alist");
159 SCM rsym = r ? SCM_EOL : ly_symbol2scm ("right-edge");
162 We used to use #'cause to find out the symbol and the spacing
163 table, but that gets icky when that grob is suicided for some
168 extract_grob_set (r, "elements", elts);
169 for (int i = elts.size ();
170 !scm_is_symbol (rsym) && i--;)
173 rsym = elt->get_property ("break-align-symbol");
177 if (rsym == ly_symbol2scm ("left-edge"))
181 if (scm_is_symbol (rsym))
182 entry = scm_assq (rsym, alist);
184 bool entry_found = scm_is_pair (entry);
188 if (scm_is_symbol (rsym))
189 sym_string = ly_symbol2string (rsym);
192 if (unsmob_grob (l->get_property ("cause")))
193 orig_string = unsmob_grob (l->get_property ("cause"))->name ();
195 programming_error (_f ("No spacing entry from %s to `%s'",
196 orig_string.to_str0 (),
197 sym_string.to_str0 ()));
201 SCM type = ly_symbol2scm ("extra-space");
205 entry = scm_cdr (entry);
207 distance = scm_to_double (scm_cdr (entry));
208 type = scm_car (entry);
213 if (type == ly_symbol2scm ("extra-space"))
214 offsets[next_idx] = extents[idx][RIGHT] + distance
215 - extents[next_idx][LEFT];
216 /* should probably junk minimum-space */
217 else if (type == ly_symbol2scm ("minimum-space"))
218 offsets[next_idx] = max (extents[idx][RIGHT], distance);
221 extra_right_space = distance;
227 Interval total_extent;
229 Real alignment_off = 0.0;
230 for (int i = 0; i < offsets.size (); i++)
234 alignment_off = -here;
235 total_extent.unite (extents[i] + here);
238 if (total_extent.is_empty ())
241 if (me->break_status_dir () == LEFT)
242 alignment_off = -total_extent[RIGHT] - extra_right_space;
243 else if (edge_idx < 0)
244 alignment_off = -total_extent[LEFT];
246 here = alignment_off;
247 for (int i = 0; i < offsets.size (); i++)
250 elems[i]->translate_axis (here, X_AXIS);
256 ADD_INTERFACE (Break_aligned_interface, "break-aligned-interface",
257 "Items that are aligned in prefatory matter.\n"
259 "The spacing of these items is controlled by the @code{space-alist}\n"
260 "property. It contains a list @code{break-align-symbol}s with a specification\n"
261 "of the associated space. The space specification can be "
263 "@item (minimum-space . @var{spc}))\n"
264 " Pad space until the distance is @var{spc}\n"
265 "@item (fixed-space . @var{spc})\n"
266 " Set a fixed space\n"
267 "@item (semi-fixed-space . @var{spc})\n"
268 " Set a space. Half of it is fixed and half is stretchable. \n"
269 "(does not work at start of line. fixme)\n"
270 "@item (extra-space . @var{spc})\n"
271 " Add @var{spc} amount of space.\n"
274 "Special keys for the alist are @code{first-note} and @code{next-note}, signifying\n"
275 "the first note on a line, and the next note halfway a line.\n"
277 "Rules for this spacing are much more complicated than this. \n"
278 "See [Wanske] page 126 -- 134, [Ross] pg 143 -- 147\n",
279 "break-align-symbol space-alist");
281 ADD_INTERFACE (Break_align_interface, "break-alignment-interface",
282 "The object that performs break aligment. See @ref{break-aligned-interface}.",
286 "break-align-orders");