1 #define __SP_OBJECT_C__
2 /** \file
3 * SPObject implementation.
4 *
5 * Authors:
6 * Lauris Kaplinski <lauris@kaplinski.com>
7 * bulia byak <buliabyak@users.sf.net>
8 *
9 * Copyright (C) 1999-2005 authors
10 * Copyright (C) 2001-2002 Ximian, Inc.
11 *
12 * Released under GNU GPL, read the file 'COPYING' for more information
13 */
15 /** \class SPObject
16 *
17 * SPObject is an abstract base class of all of the document nodes at the
18 * SVG document level. Each SPObject subclass implements a certain SVG
19 * element node type, or is an abstract base class for different node
20 * types. The SPObject layer is bound to the SPRepr layer, closely
21 * following the SPRepr mutations via callbacks. During creation,
22 * SPObject parses and interprets all textual attributes and CSS style
23 * strings of the SPRepr, and later updates the internal state whenever
24 * it receives a signal about a change. The opposite is not true - there
25 * are methods manipulating SPObjects directly and such changes do not
26 * propagate to the SPRepr layer. This is important for implementation of
27 * the undo stack, animations and other features.
28 *
29 * SPObjects are bound to the higher-level container SPDocument, which
30 * provides document level functionality such as the undo stack,
31 * dictionary and so on. Source: doc/architecture.txt
32 */
35 #include "helper/sp-marshal.h"
36 #include "xml/node-event-vector.h"
37 #include "attributes.h"
38 #include "document.h"
39 #include "style.h"
40 #include "sp-object-repr.h"
41 #include "sp-root.h"
42 #include "streq.h"
43 #include "strneq.h"
44 #include "xml/repr.h"
45 #include "xml/node-fns.h"
46 #include "debug/event-tracker.h"
48 #include "algorithms/longest-common-suffix.h"
49 using std::memcpy;
50 using std::strchr;
51 using std::strcmp;
52 using std::strlen;
53 using std::strstr;
55 #define noSP_OBJECT_DEBUG_CASCADE
57 #define noSP_OBJECT_DEBUG
59 #ifdef SP_OBJECT_DEBUG
60 # define debug(f, a...) { g_print("%s(%d) %s:", \
61 __FILE__,__LINE__,__FUNCTION__); \
62 g_print(f, ## a); \
63 g_print("\n"); \
64 }
65 #else
66 # define debug(f, a...) /**/
67 #endif
69 static void sp_object_class_init(SPObjectClass *klass);
70 static void sp_object_init(SPObject *object);
71 static void sp_object_finalize(GObject *object);
73 static void sp_object_child_added(SPObject *object, Inkscape::XML::Node *child, Inkscape::XML::Node *ref);
74 static void sp_object_remove_child(SPObject *object, Inkscape::XML::Node *child);
75 static void sp_object_order_changed(SPObject *object, Inkscape::XML::Node *child, Inkscape::XML::Node *old_ref, Inkscape::XML::Node *new_ref);
77 static void sp_object_release(SPObject *object);
78 static void sp_object_build(SPObject *object, SPDocument *document, Inkscape::XML::Node *repr);
80 static void sp_object_private_set(SPObject *object, unsigned int key, gchar const *value);
81 static Inkscape::XML::Node *sp_object_private_write(SPObject *object, Inkscape::XML::Node *repr, guint flags);
83 /* Real handlers of repr signals */
85 static void sp_object_repr_attr_changed(Inkscape::XML::Node *repr, gchar const *key, gchar const *oldval, gchar const *newval, bool is_interactive, gpointer data);
87 static void sp_object_repr_content_changed(Inkscape::XML::Node *repr, gchar const *oldcontent, gchar const *newcontent, gpointer data);
89 static void sp_object_repr_child_added(Inkscape::XML::Node *repr, Inkscape::XML::Node *child, Inkscape::XML::Node *ref, gpointer data);
90 static void sp_object_repr_child_removed(Inkscape::XML::Node *repr, Inkscape::XML::Node *child, Inkscape::XML::Node *ref, void *data);
92 static void sp_object_repr_order_changed(Inkscape::XML::Node *repr, Inkscape::XML::Node *child, Inkscape::XML::Node *old, Inkscape::XML::Node *newer, gpointer data);
94 static gchar *sp_object_get_unique_id(SPObject *object, gchar const *defid);
96 guint update_in_progress = 0; // guard against update-during-update
98 enum {RELEASE, MODIFIED, LAST_SIGNAL};
100 Inkscape::XML::NodeEventVector object_event_vector = {
101 sp_object_repr_child_added,
102 sp_object_repr_child_removed,
103 sp_object_repr_attr_changed,
104 sp_object_repr_content_changed,
105 sp_object_repr_order_changed
106 };
108 static GObjectClass *parent_class;
109 static guint object_signals[LAST_SIGNAL] = {0};
111 /**
112 * Registers the SPObject class with Gdk and returns its type number.
113 */
114 GType
115 sp_object_get_type(void)
116 {
117 static GType type = 0;
118 if (!type) {
119 GTypeInfo info = {
120 sizeof(SPObjectClass),
121 NULL, NULL,
122 (GClassInitFunc) sp_object_class_init,
123 NULL, NULL,
124 sizeof(SPObject),
125 16,
126 (GInstanceInitFunc) sp_object_init,
127 NULL
128 };
129 type = g_type_register_static(G_TYPE_OBJECT, "SPObject", &info, (GTypeFlags)0);
130 }
131 return type;
132 }
134 /**
135 * Initializes the SPObject vtable.
136 */
137 static void
138 sp_object_class_init(SPObjectClass *klass)
139 {
140 GObjectClass *object_class;
142 object_class = (GObjectClass *) klass;
144 parent_class = (GObjectClass *) g_type_class_ref(G_TYPE_OBJECT);
146 object_signals[RELEASE] = g_signal_new("release",
147 G_TYPE_FROM_CLASS(klass),
148 (GSignalFlags)(G_SIGNAL_RUN_CLEANUP | G_SIGNAL_NO_RECURSE | G_SIGNAL_NO_HOOKS),
149 G_STRUCT_OFFSET(SPObjectClass, release),
150 NULL, NULL,
151 sp_marshal_VOID__VOID,
152 G_TYPE_NONE, 0);
153 object_signals[MODIFIED] = g_signal_new("modified",
154 G_TYPE_FROM_CLASS(klass),
155 G_SIGNAL_RUN_FIRST,
156 G_STRUCT_OFFSET(SPObjectClass, modified),
157 NULL, NULL,
158 sp_marshal_NONE__UINT,
159 G_TYPE_NONE, 1, G_TYPE_UINT);
161 object_class->finalize = sp_object_finalize;
163 klass->child_added = sp_object_child_added;
164 klass->remove_child = sp_object_remove_child;
165 klass->order_changed = sp_object_order_changed;
167 klass->release = sp_object_release;
169 klass->build = sp_object_build;
171 klass->set = sp_object_private_set;
172 klass->write = sp_object_private_write;
173 }
175 /**
176 * Callback to initialize the SPObject object.
177 */
178 static void
179 sp_object_init(SPObject *object)
180 {
181 debug("id=%x, typename=%s",object, g_type_name_from_instance((GTypeInstance*)object));
183 object->hrefcount = 0;
184 object->_total_hrefcount = 0;
185 object->document = NULL;
186 object->children = object->_last_child = NULL;
187 object->parent = object->next = NULL;
188 object->repr = NULL;
189 object->id = NULL;
190 object->style = NULL;
192 object->_collection_policy = SPObject::COLLECT_WITH_PARENT;
194 new (&object->_delete_signal) sigc::signal<void, SPObject *>();
195 new (&object->_position_changed_signal) sigc::signal<void, SPObject *>();
196 object->_successor = NULL;
198 object->_label = NULL;
199 object->_default_label = NULL;
200 }
202 /**
203 * Callback to destroy all members and connections of object and itself.
204 */
205 static void
206 sp_object_finalize(GObject *object)
207 {
208 SPObject *spobject = (SPObject *)object;
210 g_free(spobject->_label);
211 g_free(spobject->_default_label);
212 spobject->_label = NULL;
213 spobject->_default_label = NULL;
215 if (spobject->_successor) {
216 sp_object_unref(spobject->_successor, NULL);
217 spobject->_successor = NULL;
218 }
220 if (((GObjectClass *) (parent_class))->finalize) {
221 (* ((GObjectClass *) (parent_class))->finalize)(object);
222 }
224 spobject->_delete_signal.~signal();
225 spobject->_position_changed_signal.~signal();
226 }
228 namespace {
230 Inkscape::Util::shared_ptr<char> stringify(SPObject *obj) {
231 char *temp=g_strdup_printf("%p", obj);
232 Inkscape::Util::shared_ptr<char> result=Inkscape::Util::share_string(temp);
233 g_free(temp);
234 return result;
235 }
237 Inkscape::Util::shared_ptr<char> stringify(unsigned n) {
238 char *temp=g_strdup_printf("%u", n);
239 Inkscape::Util::shared_ptr<char> result=Inkscape::Util::share_string(temp);
240 g_free(temp);
241 return result;
242 }
244 class RefEvent : public Inkscape::Debug::Event {
245 public:
246 enum Type { REF, UNREF };
248 RefEvent(SPObject *object, Type type)
249 : _object(stringify(object)), _refcount(G_OBJECT(object)->ref_count),
250 _type(type)
251 {}
253 static Category category() { return REFCOUNT; }
255 Inkscape::Util::shared_ptr<char> name() const {
256 if ( _type == REF) {
257 return Inkscape::Util::share_static_string("sp-object-ref");
258 } else {
259 return Inkscape::Util::share_static_string("sp-object-unref");
260 }
261 }
262 unsigned propertyCount() const { return 2; }
263 PropertyPair property(unsigned index) const {
264 switch (index) {
265 case 0:
266 return PropertyPair("object", _object);
267 case 1:
268 return PropertyPair("refcount", stringify( _type == REF ? _refcount + 1 : _refcount - 1 ));
269 default:
270 return PropertyPair();
271 }
272 }
274 private:
275 Inkscape::Util::shared_ptr<char> _object;
276 unsigned _refcount;
277 Type _type;
278 };
280 }
282 /**
283 * Increase reference count of object, with possible debugging.
284 *
285 * \param owner If non-NULL, make debug log entry.
286 * \return object, NULL is error.
287 * \pre object points to real object
288 */
289 SPObject *
290 sp_object_ref(SPObject *object, SPObject *owner)
291 {
292 g_return_val_if_fail(object != NULL, NULL);
293 g_return_val_if_fail(SP_IS_OBJECT(object), NULL);
294 g_return_val_if_fail(!owner || SP_IS_OBJECT(owner), NULL);
296 Inkscape::Debug::EventTracker<> tracker;
297 tracker.set<RefEvent>(object, RefEvent::REF);
299 g_object_ref(G_OBJECT(object));
301 return object;
302 }
304 /**
305 * Decrease reference count of object, with possible debugging and
306 * finalization.
307 *
308 * \param owner If non-NULL, make debug log entry.
309 * \return always NULL
310 * \pre object points to real object
311 */
312 SPObject *
313 sp_object_unref(SPObject *object, SPObject *owner)
314 {
315 g_return_val_if_fail(object != NULL, NULL);
316 g_return_val_if_fail(SP_IS_OBJECT(object), NULL);
317 g_return_val_if_fail(!owner || SP_IS_OBJECT(owner), NULL);
319 Inkscape::Debug::EventTracker<> tracker;
320 tracker.set<RefEvent>(object, RefEvent::UNREF);
322 g_object_unref(G_OBJECT(object));
324 return NULL;
325 }
327 /**
328 * Increase weak refcount.
329 *
330 * Hrefcount is used for weak references, for example, to
331 * determine whether any graphical element references a certain gradient
332 * node.
333 * \param owner Ignored.
334 * \return object, NULL is error
335 * \pre object points to real object
336 */
337 SPObject *
338 sp_object_href(SPObject *object, gpointer owner)
339 {
340 g_return_val_if_fail(object != NULL, NULL);
341 g_return_val_if_fail(SP_IS_OBJECT(object), NULL);
343 object->hrefcount++;
344 object->_updateTotalHRefCount(1);
346 return object;
347 }
349 /**
350 * Decrease weak refcount.
351 *
352 * Hrefcount is used for weak references, for example, to determine whether
353 * any graphical element references a certain gradient node.
354 * \param owner Ignored.
355 * \return always NULL
356 * \pre object points to real object and hrefcount>0
357 */
358 SPObject *
359 sp_object_hunref(SPObject *object, gpointer owner)
360 {
361 g_return_val_if_fail(object != NULL, NULL);
362 g_return_val_if_fail(SP_IS_OBJECT(object), NULL);
363 g_return_val_if_fail(object->hrefcount > 0, NULL);
365 object->hrefcount--;
366 object->_updateTotalHRefCount(-1);
368 return NULL;
369 }
371 /**
372 * Adds increment to _total_hrefcount of object and its parents.
373 */
374 void
375 SPObject::_updateTotalHRefCount(int increment) {
376 SPObject *topmost_collectable = NULL;
377 for ( SPObject *iter = this ; iter ; iter = SP_OBJECT_PARENT(iter) ) {
378 iter->_total_hrefcount += increment;
379 if ( iter->_total_hrefcount < iter->hrefcount ) {
380 g_critical("HRefs overcounted");
381 }
382 if ( iter->_total_hrefcount == 0 &&
383 iter->_collection_policy != COLLECT_WITH_PARENT )
384 {
385 topmost_collectable = iter;
386 }
387 }
388 if (topmost_collectable) {
389 topmost_collectable->requestOrphanCollection();
390 }
391 }
393 /**
394 * True if object is non-NULL and this is some in/direct parent of object.
395 */
396 bool
397 SPObject::isAncestorOf(SPObject const *object) const {
398 g_return_val_if_fail(object != NULL, false);
399 object = SP_OBJECT_PARENT(object);
400 while (object) {
401 if ( object == this ) {
402 return true;
403 }
404 object = SP_OBJECT_PARENT(object);
405 }
406 return false;
407 }
409 namespace {
411 bool same_objects(SPObject const &a, SPObject const &b) {
412 return &a == &b;
413 }
415 }
417 /**
418 * Returns youngest object being parent to this and object.
419 */
420 SPObject const *
421 SPObject::nearestCommonAncestor(SPObject const *object) const {
422 g_return_val_if_fail(object != NULL, NULL);
424 using Inkscape::Algorithms::longest_common_suffix;
425 return longest_common_suffix<SPObject::ConstParentIterator>(this, object, NULL, &same_objects);
426 }
428 SPObject const *AncestorSon(SPObject const *obj, SPObject const *ancestor) {
429 if (obj == NULL || ancestor == NULL)
430 return NULL;
431 if (SP_OBJECT_PARENT(obj) == ancestor)
432 return obj;
433 return AncestorSon(SP_OBJECT_PARENT(obj), ancestor);
434 }
436 /**
437 * Compares height of objects in tree.
438 *
439 * Works for different-parent objects, so long as they have a common ancestor.
440 * \return \verbatim
441 * 0 positions are equivalent
442 * 1 first object's position is greater than the second
443 * -1 first object's position is less than the second \endverbatim
444 */
445 int
446 sp_object_compare_position(SPObject const *first, SPObject const *second)
447 {
448 if (first == second) return 0;
450 SPObject const *ancestor = first->nearestCommonAncestor(second);
451 if (ancestor == NULL) return 0; // cannot compare, no common ancestor!
453 // we have an object and its ancestor (should not happen when sorting selection)
454 if (ancestor == first)
455 return 1;
456 if (ancestor == second)
457 return -1;
459 SPObject const *to_first = AncestorSon(first, ancestor);
460 SPObject const *to_second = AncestorSon(second, ancestor);
462 g_assert(SP_OBJECT_PARENT(to_second) == SP_OBJECT_PARENT(to_first));
464 return sp_repr_compare_position(SP_OBJECT_REPR(to_first), SP_OBJECT_REPR(to_second));
465 }
468 /**
469 * Append repr as child of this object.
470 * \pre this is not a cloned object
471 */
472 SPObject *
473 SPObject::appendChildRepr(Inkscape::XML::Node *repr) {
474 if (!SP_OBJECT_IS_CLONED(this)) {
475 SP_OBJECT_REPR(this)->appendChild(repr);
476 return SP_OBJECT_DOCUMENT(this)->getObjectByRepr(repr);
477 } else {
478 g_critical("Attempt to append repr as child of cloned object");
479 return NULL;
480 }
481 }
483 /** Gets the label property for the object or a default if no label
484 * is defined.
485 */
486 gchar const *
487 SPObject::label() const {
488 return _label;
489 }
491 /** Returns a default label property for the object. */
492 gchar const *
493 SPObject::defaultLabel() const {
494 if (_label) {
495 return _label;
496 } else {
497 if (!_default_label) {
498 gchar const *id=SP_OBJECT_ID(this);
499 if (id) {
500 _default_label = g_strdup_printf("#%s", id);
501 } else {
502 _default_label = g_strdup_printf("<%s>", SP_OBJECT_REPR(this)->name());
503 }
504 }
505 return _default_label;
506 }
507 }
509 /** Sets the label property for the object */
510 void
511 SPObject::setLabel(gchar const *label) {
512 SP_OBJECT_REPR(this)->setAttribute("inkscape:label", label, false);
513 }
516 /** Queues the object for orphan collection */
517 void
518 SPObject::requestOrphanCollection() {
519 g_return_if_fail(document != NULL);
520 document->queueForOrphanCollection(this);
522 /** \todo
523 * This is a temporary hack added to make fill&stroke rebuild its
524 * gradient list when the defs are vacuumed. gradient-vector.cpp
525 * listens to the modified signal on defs, and now we give it that
526 * signal. Mental says that this should be made automatic by
527 * merging SPObjectGroup with SPObject; SPObjectGroup would issue
528 * this signal automatically. Or maybe just derive SPDefs from
529 * SPObjectGroup?
530 */
532 this->requestModified(SP_OBJECT_CHILD_MODIFIED_FLAG);
533 }
535 /** Sends the delete signal to all children of this object recursively */
536 void
537 SPObject::_sendDeleteSignalRecursive() {
538 for (SPObject *child = sp_object_first_child(this); child; child = SP_OBJECT_NEXT(child)) {
539 child->_delete_signal.emit(child);
540 child->_sendDeleteSignalRecursive();
541 }
542 }
544 /**
545 * Deletes the object reference, unparenting it from its parent.
546 *
547 * If the \a propagate parameter is set to true, it emits a delete
548 * signal. If the \a propagate_descendants parameter is true, it
549 * recursively sends the delete signal to children.
550 */
551 void
552 SPObject::deleteObject(bool propagate, bool propagate_descendants)
553 {
554 sp_object_ref(this, NULL);
555 if (propagate) {
556 _delete_signal.emit(this);
557 }
558 if (propagate_descendants) {
559 this->_sendDeleteSignalRecursive();
560 }
562 Inkscape::XML::Node *repr=SP_OBJECT_REPR(this);
563 if (repr && sp_repr_parent(repr)) {
564 sp_repr_unparent(repr);
565 }
567 if (_successor) {
568 _successor->deleteObject(propagate, propagate_descendants);
569 }
570 sp_object_unref(this, NULL);
571 }
573 /**
574 * Put object into object tree, under parent, and behind prev;
575 * also update object's XML space.
576 */
577 void
578 sp_object_attach(SPObject *parent, SPObject *object, SPObject *prev)
579 {
580 g_return_if_fail(parent != NULL);
581 g_return_if_fail(SP_IS_OBJECT(parent));
582 g_return_if_fail(object != NULL);
583 g_return_if_fail(SP_IS_OBJECT(object));
584 g_return_if_fail(!prev || SP_IS_OBJECT(prev));
585 g_return_if_fail(!prev || prev->parent == parent);
586 g_return_if_fail(!object->parent);
588 sp_object_ref(object, parent);
589 object->parent = parent;
590 parent->_updateTotalHRefCount(object->_total_hrefcount);
592 SPObject *next;
593 if (prev) {
594 next = prev->next;
595 prev->next = object;
596 } else {
597 next = parent->children;
598 parent->children = object;
599 }
600 object->next = next;
601 if (!next) {
602 parent->_last_child = object;
603 }
604 if (!object->xml_space.set)
605 object->xml_space.value = parent->xml_space.value;
606 }
608 /**
609 * In list of object's siblings, move object behind prev.
610 */
611 void
612 sp_object_reorder(SPObject *object, SPObject *prev) {
613 g_return_if_fail(object != NULL);
614 g_return_if_fail(SP_IS_OBJECT(object));
615 g_return_if_fail(object->parent != NULL);
616 g_return_if_fail(object != prev);
617 g_return_if_fail(!prev || SP_IS_OBJECT(prev));
618 g_return_if_fail(!prev || prev->parent == object->parent);
620 SPObject *const parent=object->parent;
622 SPObject *old_prev=NULL;
623 for ( SPObject *child = parent->children ; child && child != object ;
624 child = child->next )
625 {
626 old_prev = child;
627 }
629 SPObject *next=object->next;
630 if (old_prev) {
631 old_prev->next = next;
632 } else {
633 parent->children = next;
634 }
635 if (!next) {
636 parent->_last_child = old_prev;
637 }
638 if (prev) {
639 next = prev->next;
640 prev->next = object;
641 } else {
642 next = parent->children;
643 parent->children = object;
644 }
645 object->next = next;
646 if (!next) {
647 parent->_last_child = object;
648 }
649 }
651 /**
652 * Remove object from parent's children, release and unref it.
653 */
654 void
655 sp_object_detach(SPObject *parent, SPObject *object) {
656 g_return_if_fail(parent != NULL);
657 g_return_if_fail(SP_IS_OBJECT(parent));
658 g_return_if_fail(object != NULL);
659 g_return_if_fail(SP_IS_OBJECT(object));
660 g_return_if_fail(object->parent == parent);
662 SPObject *prev=NULL;
663 for ( SPObject *child = parent->children ; child && child != object ;
664 child = child->next )
665 {
666 prev = child;
667 }
669 SPObject *next=object->next;
670 if (prev) {
671 prev->next = next;
672 } else {
673 parent->children = next;
674 }
675 if (!next) {
676 parent->_last_child = prev;
677 }
679 object->next = NULL;
680 object->parent = NULL;
682 sp_object_invoke_release(object);
683 parent->_updateTotalHRefCount(-object->_total_hrefcount);
684 sp_object_unref(object, parent);
685 }
687 /**
688 * Return object's child whose node pointer equals repr.
689 */
690 SPObject *
691 sp_object_get_child_by_repr(SPObject *object, Inkscape::XML::Node *repr)
692 {
693 g_return_val_if_fail(object != NULL, NULL);
694 g_return_val_if_fail(SP_IS_OBJECT(object), NULL);
695 g_return_val_if_fail(repr != NULL, NULL);
697 if (object->_last_child && SP_OBJECT_REPR(object->_last_child) == repr)
698 return object->_last_child; // optimization for common scenario
699 for ( SPObject *child = object->children ; child ; child = child->next ) {
700 if ( SP_OBJECT_REPR(child) == repr ) {
701 return child;
702 }
703 }
705 return NULL;
706 }
708 /**
709 * Callback for child_added event.
710 * Invoked whenever the given mutation event happens in the XML tree.
711 */
712 static void
713 sp_object_child_added(SPObject *object, Inkscape::XML::Node *child, Inkscape::XML::Node *ref)
714 {
715 GType type = sp_repr_type_lookup(child);
716 if (!type) {
717 return;
718 }
719 SPObject *ochild = SP_OBJECT(g_object_new(type, 0));
720 SPObject *prev = ref ? sp_object_get_child_by_repr(object, ref) : NULL;
721 sp_object_attach(object, ochild, prev);
722 sp_object_unref(ochild, NULL);
724 sp_object_invoke_build(ochild, object->document, child, SP_OBJECT_IS_CLONED(object));
725 }
727 /**
728 * Removes, releases and unrefs all children of object.
729 *
730 * This is the opposite of build. It has to be invoked as soon as the
731 * object is removed from the tree, even if it is still alive according
732 * to reference count. The frontend unregisters the object from the
733 * document and releases the SPRepr bindings; implementations should free
734 * state data and release all child objects. Invoking release on
735 * SPRoot destroys the whole document tree.
736 * \see sp_object_build()
737 */
738 static void sp_object_release(SPObject *object)
739 {
740 debug("id=%x, typename=%s", object, g_type_name_from_instance((GTypeInstance*)object));
741 while (object->children) {
742 sp_object_detach(object, object->children);
743 }
744 }
746 /**
747 * Remove object's child whose node equals repr, release and
748 * unref it.
749 *
750 * Invoked whenever the given mutation event happens in the XML
751 * tree, BEFORE removal from the XML tree happens, so grouping
752 * objects can safely release the child data.
753 */
754 static void
755 sp_object_remove_child(SPObject *object, Inkscape::XML::Node *child)
756 {
757 debug("id=%x, typename=%s", object, g_type_name_from_instance((GTypeInstance*)object));
758 SPObject *ochild = sp_object_get_child_by_repr(object, child);
759 g_return_if_fail(ochild != NULL);
760 sp_object_detach(object, ochild);
761 }
763 /**
764 * Move object corresponding to child after sibling object corresponding
765 * to new_ref.
766 * Invoked whenever the given mutation event happens in the XML tree.
767 * \param old_ref Ignored
768 */
769 static void sp_object_order_changed(SPObject *object, Inkscape::XML::Node *child, Inkscape::XML::Node *old_ref,
770 Inkscape::XML::Node *new_ref)
771 {
772 SPObject *ochild = sp_object_get_child_by_repr(object, child);
773 g_return_if_fail(ochild != NULL);
774 SPObject *prev = new_ref ? sp_object_get_child_by_repr(object, new_ref) : NULL;
775 sp_object_reorder(ochild, prev);
776 ochild->_position_changed_signal.emit(ochild);
777 }
779 /**
780 * Virtual build callback.
781 *
782 * This has to be invoked immediately after creation of an SPObject. The
783 * frontend method ensures that the new object is properly attached to
784 * the document and repr; implementation then will parse all of the attributes,
785 * generate the children objects and so on. Invoking build on the SPRoot
786 * object results in creation of the whole document tree (this is, what
787 * SPDocument does after the creation of the XML tree).
788 * \see sp_object_release()
789 */
790 static void
791 sp_object_build(SPObject *object, SPDocument *document, Inkscape::XML::Node *repr)
792 {
793 /* Nothing specific here */
794 debug("id=%x, typename=%s", object, g_type_name_from_instance((GTypeInstance*)object));
796 sp_object_read_attr(object, "xml:space");
797 sp_object_read_attr(object, "inkscape:label");
798 sp_object_read_attr(object, "inkscape:collect");
800 for (Inkscape::XML::Node *rchild = repr->firstChild() ; rchild != NULL; rchild = rchild->next()) {
801 GType type = sp_repr_type_lookup(rchild);
802 if (!type) {
803 continue;
804 }
805 SPObject *child = SP_OBJECT(g_object_new(type, 0));
806 sp_object_attach(object, child, object->lastChild());
807 sp_object_unref(child, NULL);
808 sp_object_invoke_build(child, document, rchild, SP_OBJECT_IS_CLONED(object));
809 }
810 }
812 void
813 sp_object_invoke_build(SPObject *object, SPDocument *document, Inkscape::XML::Node *repr, unsigned int cloned)
814 {
815 debug("id=%x, typename=%s", object, g_type_name_from_instance((GTypeInstance*)object));
817 g_assert(object != NULL);
818 g_assert(SP_IS_OBJECT(object));
819 g_assert(document != NULL);
820 g_assert(repr != NULL);
822 g_assert(object->document == NULL);
823 g_assert(object->repr == NULL);
824 g_assert(object->id == NULL);
826 /* Bookkeeping */
828 object->document = document;
829 object->repr = repr;
830 Inkscape::GC::anchor(repr);
831 object->cloned = cloned;
833 if (!SP_OBJECT_IS_CLONED(object)) {
834 object->document->bindObjectToRepr(object->repr, object);
836 if (Inkscape::XML::id_permitted(object->repr)) {
837 /* If we are not cloned, force unique id */
838 gchar const *id = object->repr->attribute("id");
839 gchar *realid = sp_object_get_unique_id(object, id);
840 g_assert(realid != NULL);
842 object->document->bindObjectToId(realid, object);
843 object->id = realid;
845 /* Redefine ID, if required */
846 if ((id == NULL) || (strcmp(id, realid) != 0)) {
847 gboolean undo_sensitive=sp_document_get_undo_sensitive(document);
848 sp_document_set_undo_sensitive(document, FALSE);
849 object->repr->setAttribute("id", realid);
850 sp_document_set_undo_sensitive(document, undo_sensitive);
851 }
852 }
853 } else {
854 g_assert(object->id == NULL);
855 }
857 /* Invoke derived methods, if any */
859 if (((SPObjectClass *) G_OBJECT_GET_CLASS(object))->build) {
860 (*((SPObjectClass *) G_OBJECT_GET_CLASS(object))->build)(object, document, repr);
861 }
863 /* Signalling (should be connected AFTER processing derived methods */
864 sp_repr_add_listener(repr, &object_event_vector, object);
865 }
867 void
868 sp_object_invoke_release(SPObject *object)
869 {
870 g_assert(object != NULL);
871 g_assert(SP_IS_OBJECT(object));
873 // we need to remember our parent
874 // g_assert(!object->parent);
875 g_assert(!object->next);
876 g_assert(object->document);
877 g_assert(object->repr);
879 sp_repr_remove_listener_by_data(object->repr, object);
881 g_signal_emit(G_OBJECT(object), object_signals[RELEASE], 0);
883 /* all hrefs should be released by the "release" handlers */
884 g_assert(object->hrefcount == 0);
886 if (!SP_OBJECT_IS_CLONED(object)) {
887 if (object->id) {
888 object->document->bindObjectToId(object->id, NULL);
889 }
890 g_free(object->id);
891 object->id = NULL;
893 g_free(object->_default_label);
894 object->_default_label = NULL;
896 object->document->bindObjectToRepr(object->repr, NULL);
897 } else {
898 g_assert(!object->id);
899 }
901 if (object->style) {
902 object->style = sp_style_unref(object->style);
903 }
905 Inkscape::GC::release(object->repr);
907 object->document = NULL;
908 object->repr = NULL;
909 }
911 /**
912 * Callback for child_added node event.
913 */
914 static void
915 sp_object_repr_child_added(Inkscape::XML::Node *repr, Inkscape::XML::Node *child, Inkscape::XML::Node *ref, gpointer data)
916 {
917 SPObject *object = SP_OBJECT(data);
919 if (((SPObjectClass *) G_OBJECT_GET_CLASS(object))->child_added)
920 (*((SPObjectClass *)G_OBJECT_GET_CLASS(object))->child_added)(object, child, ref);
921 }
923 /**
924 * Callback for remove_child node event.
925 */
926 static void
927 sp_object_repr_child_removed(Inkscape::XML::Node *repr, Inkscape::XML::Node *child, Inkscape::XML::Node *ref, gpointer data)
928 {
929 SPObject *object = SP_OBJECT(data);
931 if (((SPObjectClass *) G_OBJECT_GET_CLASS(object))->remove_child) {
932 (* ((SPObjectClass *)G_OBJECT_GET_CLASS(object))->remove_child)(object, child);
933 }
934 }
936 /**
937 * Callback for order_changed node event.
938 *
939 * \todo fixme:
940 */
941 static void
942 sp_object_repr_order_changed(Inkscape::XML::Node *repr, Inkscape::XML::Node *child, Inkscape::XML::Node *old, Inkscape::XML::Node *newer, gpointer data)
943 {
944 SPObject *object = SP_OBJECT(data);
946 if (((SPObjectClass *) G_OBJECT_GET_CLASS(object))->order_changed) {
947 (* ((SPObjectClass *)G_OBJECT_GET_CLASS(object))->order_changed)(object, child, old, newer);
948 }
949 }
951 /**
952 * Callback for set event.
953 */
954 static void
955 sp_object_private_set(SPObject *object, unsigned int key, gchar const *value)
956 {
957 g_assert(key != SP_ATTR_INVALID);
959 switch (key) {
960 case SP_ATTR_ID:
961 if ( !SP_OBJECT_IS_CLONED(object) && object->repr->type() == Inkscape::XML::ELEMENT_NODE ) {
962 SPDocument *document=object->document;
963 SPObject *conflict=NULL;
965 if (value) {
966 conflict = document->getObjectById((char const *)value);
967 }
968 if ( conflict && conflict != object ) {
969 sp_object_ref(conflict, NULL);
970 // give the conflicting object a new ID
971 gchar *new_conflict_id = sp_object_get_unique_id(conflict, NULL);
972 SP_OBJECT_REPR(conflict)->setAttribute("id", new_conflict_id);
973 g_free(new_conflict_id);
974 sp_object_unref(conflict, NULL);
975 }
977 if (object->id) {
978 document->bindObjectToId(object->id, NULL);
979 g_free(object->id);
980 }
982 if (value) {
983 object->id = g_strdup((char const*)value);
984 document->bindObjectToId(object->id, object);
985 } else {
986 object->id = NULL;
987 }
989 g_free(object->_default_label);
990 object->_default_label = NULL;
991 }
992 break;
993 case SP_ATTR_INKSCAPE_LABEL:
994 g_free(object->_label);
995 if (value) {
996 object->_label = g_strdup(value);
997 } else {
998 object->_label = NULL;
999 }
1000 g_free(object->_default_label);
1001 object->_default_label = NULL;
1002 break;
1003 case SP_ATTR_INKSCAPE_COLLECT:
1004 if ( value && !strcmp(value, "always") ) {
1005 object->setCollectionPolicy(SPObject::ALWAYS_COLLECT);
1006 } else {
1007 object->setCollectionPolicy(SPObject::COLLECT_WITH_PARENT);
1008 }
1009 break;
1010 case SP_ATTR_XML_SPACE:
1011 if (value && !strcmp(value, "preserve")) {
1012 object->xml_space.value = SP_XML_SPACE_PRESERVE;
1013 object->xml_space.set = TRUE;
1014 } else if (value && !strcmp(value, "default")) {
1015 object->xml_space.value = SP_XML_SPACE_DEFAULT;
1016 object->xml_space.set = TRUE;
1017 } else if (object->parent) {
1018 SPObject *parent;
1019 parent = object->parent;
1020 object->xml_space.value = parent->xml_space.value;
1021 }
1022 object->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
1023 break;
1024 default:
1025 break;
1026 }
1027 }
1029 /**
1030 * Call virtual set() function of object.
1031 */
1032 void
1033 sp_object_set(SPObject *object, unsigned int key, gchar const *value)
1034 {
1035 g_assert(object != NULL);
1036 g_assert(SP_IS_OBJECT(object));
1038 if (((SPObjectClass *) G_OBJECT_GET_CLASS(object))->set) {
1039 ((SPObjectClass *) G_OBJECT_GET_CLASS(object))->set(object, key, value);
1040 }
1041 }
1043 /**
1044 * Read value of key attribute from XML node into object.
1045 */
1046 void
1047 sp_object_read_attr(SPObject *object, gchar const *key)
1048 {
1049 g_assert(object != NULL);
1050 g_assert(SP_IS_OBJECT(object));
1051 g_assert(key != NULL);
1053 g_assert(object->repr != NULL);
1055 unsigned int keyid = sp_attribute_lookup(key);
1056 if (keyid != SP_ATTR_INVALID) {
1057 /* Retrieve the 'key' attribute from the object's XML representation */
1058 gchar const *value = object->repr->attribute(key);
1060 sp_object_set(object, keyid, value);
1061 }
1062 }
1064 /**
1065 * Callback for attr_changed node event.
1066 */
1067 static void
1068 sp_object_repr_attr_changed(Inkscape::XML::Node *repr, gchar const *key, gchar const *oldval, gchar const *newval, bool is_interactive, gpointer data)
1069 {
1070 SPObject *object = SP_OBJECT(data);
1072 sp_object_read_attr(object, key);
1074 // manual changes to extension attributes require the normal
1075 // attributes, which depend on them, to be updated immediately
1076 if (is_interactive) {
1077 object->updateRepr(repr, 0);
1078 }
1079 }
1081 /**
1082 * Callback for content_changed node event.
1083 */
1084 static void
1085 sp_object_repr_content_changed(Inkscape::XML::Node *repr, gchar const *oldcontent, gchar const *newcontent, gpointer data)
1086 {
1087 SPObject *object = SP_OBJECT(data);
1089 if (((SPObjectClass *) G_OBJECT_GET_CLASS(object))->read_content)
1090 (*((SPObjectClass *) G_OBJECT_GET_CLASS(object))->read_content)(object);
1091 }
1093 /**
1094 * Return string representation of space value.
1095 */
1096 static gchar const*
1097 sp_xml_get_space_string(unsigned int space)
1098 {
1099 switch (space) {
1100 case SP_XML_SPACE_DEFAULT:
1101 return "default";
1102 case SP_XML_SPACE_PRESERVE:
1103 return "preserve";
1104 default:
1105 return NULL;
1106 }
1107 }
1109 /**
1110 * Callback for write event.
1111 */
1112 static Inkscape::XML::Node *
1113 sp_object_private_write(SPObject *object, Inkscape::XML::Node *repr, guint flags)
1114 {
1115 if (!repr && (flags & SP_OBJECT_WRITE_BUILD)) {
1116 repr = SP_OBJECT_REPR(object)->duplicate();
1117 if (!( flags & SP_OBJECT_WRITE_EXT )) {
1118 repr->setAttribute("inkscape:collect", NULL);
1119 }
1120 } else {
1121 repr->setAttribute("id", object->id);
1123 if (object->xml_space.set) {
1124 char const *xml_space;
1125 xml_space = sp_xml_get_space_string(object->xml_space.value);
1126 repr->setAttribute("xml:space", xml_space);
1127 }
1129 if ( flags & SP_OBJECT_WRITE_EXT &&
1130 object->collectionPolicy() == SPObject::ALWAYS_COLLECT )
1131 {
1132 repr->setAttribute("inkscape:collect", "always");
1133 } else {
1134 repr->setAttribute("inkscape:collect", NULL);
1135 }
1136 }
1138 return repr;
1139 }
1141 /**
1142 * Update this object's XML node with flags value.
1143 */
1144 Inkscape::XML::Node *
1145 SPObject::updateRepr(unsigned int flags) {
1146 if (!SP_OBJECT_IS_CLONED(this)) {
1147 Inkscape::XML::Node *repr=SP_OBJECT_REPR(this);
1148 if (repr) {
1149 return updateRepr(repr, flags);
1150 } else {
1151 g_critical("Attempt to update non-existent repr");
1152 return NULL;
1153 }
1154 } else {
1155 /* cloned objects have no repr */
1156 return NULL;
1157 }
1158 }
1160 Inkscape::XML::Node *
1161 SPObject::updateRepr(Inkscape::XML::Node *repr, unsigned int flags) {
1162 if (SP_OBJECT_IS_CLONED(this)) {
1163 /* cloned objects have no repr */
1164 return NULL;
1165 }
1166 if (((SPObjectClass *) G_OBJECT_GET_CLASS(this))->write) {
1167 if (!(flags & SP_OBJECT_WRITE_BUILD) && !repr) {
1168 repr = SP_OBJECT_REPR(this);
1169 }
1170 return ((SPObjectClass *) G_OBJECT_GET_CLASS(this))->write(this, repr, flags);
1171 } else {
1172 g_warning("Class %s does not implement ::write", G_OBJECT_TYPE_NAME(this));
1173 if (!repr) {
1174 if (flags & SP_OBJECT_WRITE_BUILD) {
1175 repr = SP_OBJECT_REPR(this)->duplicate();
1176 }
1177 /// \todo fixme: else probably error (Lauris) */
1178 } else {
1179 repr->mergeFrom(SP_OBJECT_REPR(this), "id");
1180 }
1181 return repr;
1182 }
1183 }
1185 /* Modification */
1187 /**
1188 * Add \a flags to \a object's as dirtiness flags, and
1189 * recursively add CHILD_MODIFIED flag to
1190 * parent and ancestors (as far up as necessary).
1191 */
1192 void
1193 SPObject::requestDisplayUpdate(unsigned int flags)
1194 {
1195 if (update_in_progress) {
1196 g_print("WARNING: Requested update while update in progress, counter = %d\n", update_in_progress);
1197 }
1199 g_return_if_fail(!(flags & SP_OBJECT_PARENT_MODIFIED_FLAG));
1200 g_return_if_fail((flags & SP_OBJECT_MODIFIED_FLAG) || (flags & SP_OBJECT_CHILD_MODIFIED_FLAG));
1201 g_return_if_fail(!((flags & SP_OBJECT_MODIFIED_FLAG) && (flags & SP_OBJECT_CHILD_MODIFIED_FLAG)));
1203 /* Check for propagate before we set any flags */
1204 /* Propagate means, that this is not passed through by modification request cascade yet */
1205 unsigned int propagate = (!(this->uflags & (SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_CHILD_MODIFIED_FLAG)));
1207 /* Just set this flags safe even if some have been set before */
1208 this->uflags |= flags;
1210 if (propagate) {
1211 if (this->parent) {
1212 this->parent->requestDisplayUpdate(SP_OBJECT_CHILD_MODIFIED_FLAG);
1213 } else {
1214 sp_document_request_modified(this->document);
1215 }
1216 }
1217 }
1219 void
1220 SPObject::updateDisplay(SPCtx *ctx, unsigned int flags)
1221 {
1222 g_return_if_fail(!(flags & ~SP_OBJECT_MODIFIED_CASCADE));
1224 update_in_progress ++;
1226 #ifdef SP_OBJECT_DEBUG_CASCADE
1227 g_print("Update %s:%s %x %x %x\n", g_type_name_from_instance((GTypeInstance *) this), SP_OBJECT_ID(this), flags, this->uflags, this->mflags);
1228 #endif
1230 /* Get this flags */
1231 flags |= this->uflags;
1232 /* Copy flags to modified cascade for later processing */
1233 this->mflags |= this->uflags;
1234 /* We have to clear flags here to allow rescheduling update */
1235 this->uflags = 0;
1237 // Merge style if we have good reasons to think that parent style is changed */
1238 /** \todo
1239 * I am not sure whether we should check only propagated
1240 * flag. We are currently assuming that style parsing is
1241 * done immediately. I think this is correct (Lauris).
1242 */
1243 if ((flags & SP_OBJECT_STYLE_MODIFIED_FLAG) && (flags & SP_OBJECT_PARENT_MODIFIED_FLAG)) {
1244 if (this->style && this->parent) {
1245 sp_style_merge_from_parent(this->style, this->parent->style);
1246 }
1247 }
1249 if (((SPObjectClass *) G_OBJECT_GET_CLASS(this))->update)
1250 ((SPObjectClass *) G_OBJECT_GET_CLASS(this))->update(this, ctx, flags);
1252 update_in_progress --;
1253 }
1255 void
1256 SPObject::requestModified(unsigned int flags)
1257 {
1258 g_return_if_fail( this->document != NULL );
1260 /* PARENT_MODIFIED is computed later on and is not intended to be
1261 * "manually" queued */
1262 g_return_if_fail(!(flags & SP_OBJECT_PARENT_MODIFIED_FLAG));
1264 /* we should be setting either MODIFIED or CHILD_MODIFIED... */
1265 g_return_if_fail((flags & SP_OBJECT_MODIFIED_FLAG) || (flags & SP_OBJECT_CHILD_MODIFIED_FLAG));
1267 /* ...but not both */
1268 g_return_if_fail(!((flags & SP_OBJECT_MODIFIED_FLAG) && (flags & SP_OBJECT_CHILD_MODIFIED_FLAG)));
1270 unsigned int old_mflags=this->mflags;
1271 this->mflags |= flags;
1273 /* If we already had MODIFIED or CHILD_MODIFIED queued, we will
1274 * have already queued CHILD_MODIFIED with our ancestors and
1275 * need not disturb them again.
1276 */
1277 if (!( old_mflags & ( SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_CHILD_MODIFIED_FLAG ) )) {
1278 SPObject *parent=SP_OBJECT_PARENT(this);
1279 if (parent) {
1280 parent->requestModified(SP_OBJECT_CHILD_MODIFIED_FLAG);
1281 } else {
1282 sp_document_request_modified(SP_OBJECT_DOCUMENT(this));
1283 }
1284 }
1285 }
1287 void
1288 SPObject::emitModified(unsigned int flags)
1289 {
1290 /* only the MODIFIED_CASCADE flag is legal here */
1291 g_return_if_fail(!(flags & ~SP_OBJECT_MODIFIED_CASCADE));
1293 #ifdef SP_OBJECT_DEBUG_CASCADE
1294 g_print("Modified %s:%s %x %x %x\n", g_type_name_from_instance((GTypeInstance *) this), SP_OBJECT_ID(this), flags, this->uflags, this->mflags);
1295 #endif
1297 flags |= this->mflags;
1298 /* We have to clear mflags beforehand, as signal handlers may
1299 * make changes and therefore queue new modification notifications
1300 * themselves. */
1301 this->mflags = 0;
1303 g_object_ref(G_OBJECT(this));
1304 g_signal_emit(G_OBJECT(this), object_signals[MODIFIED], 0, flags);
1305 g_object_unref(G_OBJECT(this));
1306 }
1308 /*
1309 * Get and set descriptive parameters
1310 *
1311 * These are inefficent, so they are not intended to be used interactively
1312 */
1314 gchar const *
1315 sp_object_title_get(SPObject *object)
1316 {
1317 return NULL;
1318 }
1320 gchar const *
1321 sp_object_description_get(SPObject *object)
1322 {
1323 return NULL;
1324 }
1326 unsigned int
1327 sp_object_title_set(SPObject *object, gchar const *title)
1328 {
1329 return FALSE;
1330 }
1332 unsigned int
1333 sp_object_description_set(SPObject *object, gchar const *desc)
1334 {
1335 return FALSE;
1336 }
1338 gchar const *
1339 sp_object_tagName_get(SPObject const *object, SPException *ex)
1340 {
1341 /* If exception is not clear, return */
1342 if (!SP_EXCEPTION_IS_OK(ex)) {
1343 return NULL;
1344 }
1346 /// \todo fixme: Exception if object is NULL? */
1347 return object->repr->name();
1348 }
1350 gchar const *
1351 sp_object_getAttribute(SPObject const *object, gchar const *key, SPException *ex)
1352 {
1353 /* If exception is not clear, return */
1354 if (!SP_EXCEPTION_IS_OK(ex)) {
1355 return NULL;
1356 }
1358 /// \todo fixme: Exception if object is NULL? */
1359 return (gchar const *) object->repr->attribute(key);
1360 }
1362 void
1363 sp_object_setAttribute(SPObject *object, gchar const *key, gchar const *value, SPException *ex)
1364 {
1365 /* If exception is not clear, return */
1366 g_return_if_fail(SP_EXCEPTION_IS_OK(ex));
1368 /// \todo fixme: Exception if object is NULL? */
1369 if (!sp_repr_set_attr(object->repr, key, value)) {
1370 ex->code = SP_NO_MODIFICATION_ALLOWED_ERR;
1371 }
1372 }
1374 void
1375 sp_object_removeAttribute(SPObject *object, gchar const *key, SPException *ex)
1376 {
1377 /* If exception is not clear, return */
1378 g_return_if_fail(SP_EXCEPTION_IS_OK(ex));
1380 /// \todo fixme: Exception if object is NULL? */
1381 if (!sp_repr_set_attr(object->repr, key, NULL)) {
1382 ex->code = SP_NO_MODIFICATION_ALLOWED_ERR;
1383 }
1384 }
1386 /* Helper */
1388 static gchar *
1389 sp_object_get_unique_id(SPObject *object, gchar const *id)
1390 {
1391 static unsigned long count = 0;
1393 g_assert(SP_IS_OBJECT(object));
1395 count++;
1397 gchar const *name = object->repr->name();
1398 g_assert(name != NULL);
1400 gchar const *local = strchr(name, ':');
1401 if (local) {
1402 name = local + 1;
1403 }
1405 if (id != NULL) {
1406 if (object->document->getObjectById(id) == NULL) {
1407 return g_strdup(id);
1408 }
1409 }
1411 size_t const name_len = strlen(name);
1412 size_t const buflen = name_len + (sizeof(count) * 10 / 4) + 1;
1413 gchar *const buf = (gchar *) g_malloc(buflen);
1414 memcpy(buf, name, name_len);
1415 gchar *const count_buf = buf + name_len;
1416 size_t const count_buflen = buflen - name_len;
1417 do {
1418 ++count;
1419 g_snprintf(count_buf, count_buflen, "%lu", count);
1420 } while ( object->document->getObjectById(buf) != NULL );
1421 return buf;
1422 }
1424 /* Style */
1426 /**
1427 * Returns an object style property.
1428 *
1429 * \todo
1430 * fixme: Use proper CSS parsing. The current version is buggy
1431 * in a number of situations where key is a substring of the
1432 * style string other than as a property name (including
1433 * where key is a substring of a property name), and is also
1434 * buggy in its handling of inheritance for properties that
1435 * aren't inherited by default. It also doesn't allow for
1436 * the case where the property is specified but with an invalid
1437 * value (in which case I believe the CSS2 error-handling
1438 * behaviour applies, viz. behave as if the property hadn't
1439 * been specified). Also, the current code doesn't use CRSelEng
1440 * stuff to take a value from stylesheets. Also, we aren't
1441 * setting any hooks to force an update for changes in any of
1442 * the inputs (i.e., in any of the elements that this function
1443 * queries).
1444 *
1445 * \par
1446 * Given that the default value for a property depends on what
1447 * property it is (e.g., whether to inherit or not), and given
1448 * the above comment about ignoring invalid values, and that the
1449 * repr parent isn't necessarily the right element to inherit
1450 * from (e.g., maybe we need to inherit from the referencing
1451 * <use> element instead), we should probably make the caller
1452 * responsible for ascending the repr tree as necessary.
1453 */
1454 gchar const *
1455 sp_object_get_style_property(SPObject const *object, gchar const *key, gchar const *def)
1456 {
1457 g_return_val_if_fail(object != NULL, NULL);
1458 g_return_val_if_fail(SP_IS_OBJECT(object), NULL);
1459 g_return_val_if_fail(key != NULL, NULL);
1461 gchar const *style = object->repr->attribute("style");
1462 if (style) {
1463 size_t const len = strlen(key);
1464 char const *p;
1465 while ( (p = strstr(style, key))
1466 != NULL )
1467 {
1468 p += len;
1469 while ((*p <= ' ') && *p) p++;
1470 if (*p++ != ':') break;
1471 while ((*p <= ' ') && *p) p++;
1472 size_t const inherit_len = sizeof("inherit") - 1;
1473 if (*p
1474 && !(strneq(p, "inherit", inherit_len)
1475 && (p[inherit_len] == '\0'
1476 || p[inherit_len] == ';'
1477 || g_ascii_isspace(p[inherit_len])))) {
1478 return p;
1479 }
1480 }
1481 }
1482 gchar const *val = object->repr->attribute(key);
1483 if (val && !streq(val, "inherit")) {
1484 return val;
1485 }
1486 if (object->parent) {
1487 return sp_object_get_style_property(object->parent, key, def);
1488 }
1490 return def;
1491 }
1493 /**
1494 * Lifts SVG version of all root objects to version.
1495 */
1496 void
1497 SPObject::_requireSVGVersion(Inkscape::Version version) {
1498 for ( SPObject::ParentIterator iter=this ; iter ; ++iter ) {
1499 SPObject *object=iter;
1500 if (SP_IS_ROOT(object)) {
1501 SPRoot *root=SP_ROOT(object);
1502 if ( root->version.svg < version ) {
1503 root->version.svg = version;
1504 }
1505 }
1506 }
1507 }
1509 /**
1510 * Return sodipodi version of first root ancestor or (0,0).
1511 */
1512 Inkscape::Version
1513 sp_object_get_sodipodi_version(SPObject *object)
1514 {
1515 static Inkscape::Version const zero_version(0, 0);
1517 while (object) {
1518 if (SP_IS_ROOT(object)) {
1519 return SP_ROOT(object)->version.sodipodi;
1520 }
1521 object = SP_OBJECT_PARENT(object);
1522 }
1524 return zero_version;
1525 }
1527 /**
1528 * Returns previous object in sibling list or NULL.
1529 */
1530 SPObject *
1531 sp_object_prev(SPObject *child)
1532 {
1533 SPObject *parent = SP_OBJECT_PARENT(child);
1534 for ( SPObject *i = sp_object_first_child(parent); i; i = SP_OBJECT_NEXT(i) ) {
1535 if (SP_OBJECT_NEXT(i) == child)
1536 return i;
1537 }
1538 return NULL;
1539 }
1542 /*
1543 Local Variables:
1544 mode:c++
1545 c-file-style:"stroustrup"
1546 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1547 indent-tabs-mode:nil
1548 fill-column:99
1549 End:
1550 */
1551 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :