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"
47 #include "debug/simple-event.h"
48 #include "debug/demangle.h"
49 #include "util/share.h"
50 #include "util/format.h"
52 #include "algorithms/longest-common-suffix.h"
53 using std::memcpy;
54 using std::strchr;
55 using std::strcmp;
56 using std::strlen;
57 using std::strstr;
59 #define noSP_OBJECT_DEBUG_CASCADE
61 #define noSP_OBJECT_DEBUG
63 #ifdef SP_OBJECT_DEBUG
64 # define debug(f, a...) { g_print("%s(%d) %s:", \
65 __FILE__,__LINE__,__FUNCTION__); \
66 g_print(f, ## a); \
67 g_print("\n"); \
68 }
69 #else
70 # define debug(f, a...) /**/
71 #endif
73 static void sp_object_class_init(SPObjectClass *klass);
74 static void sp_object_init(SPObject *object);
75 static void sp_object_finalize(GObject *object);
77 static void sp_object_child_added(SPObject *object, Inkscape::XML::Node *child, Inkscape::XML::Node *ref);
78 static void sp_object_remove_child(SPObject *object, Inkscape::XML::Node *child);
79 static void sp_object_order_changed(SPObject *object, Inkscape::XML::Node *child, Inkscape::XML::Node *old_ref, Inkscape::XML::Node *new_ref);
81 static void sp_object_release(SPObject *object);
82 static void sp_object_build(SPObject *object, SPDocument *document, Inkscape::XML::Node *repr);
84 static void sp_object_private_set(SPObject *object, unsigned int key, gchar const *value);
85 static Inkscape::XML::Node *sp_object_private_write(SPObject *object, Inkscape::XML::Node *repr, guint flags);
87 /* Real handlers of repr signals */
89 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);
91 static void sp_object_repr_content_changed(Inkscape::XML::Node *repr, gchar const *oldcontent, gchar const *newcontent, gpointer data);
93 static void sp_object_repr_child_added(Inkscape::XML::Node *repr, Inkscape::XML::Node *child, Inkscape::XML::Node *ref, gpointer data);
94 static void sp_object_repr_child_removed(Inkscape::XML::Node *repr, Inkscape::XML::Node *child, Inkscape::XML::Node *ref, void *data);
96 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);
98 static gchar *sp_object_get_unique_id(SPObject *object, gchar const *defid);
100 guint update_in_progress = 0; // guard against update-during-update
102 Inkscape::XML::NodeEventVector object_event_vector = {
103 sp_object_repr_child_added,
104 sp_object_repr_child_removed,
105 sp_object_repr_attr_changed,
106 sp_object_repr_content_changed,
107 sp_object_repr_order_changed
108 };
110 static GObjectClass *parent_class;
112 /**
113 * Registers the SPObject class with Gdk and returns its type number.
114 */
115 GType
116 sp_object_get_type(void)
117 {
118 static GType type = 0;
119 if (!type) {
120 GTypeInfo info = {
121 sizeof(SPObjectClass),
122 NULL, NULL,
123 (GClassInitFunc) sp_object_class_init,
124 NULL, NULL,
125 sizeof(SPObject),
126 16,
127 (GInstanceInitFunc) sp_object_init,
128 NULL
129 };
130 type = g_type_register_static(G_TYPE_OBJECT, "SPObject", &info, (GTypeFlags)0);
131 }
132 return type;
133 }
135 /**
136 * Initializes the SPObject vtable.
137 */
138 static void
139 sp_object_class_init(SPObjectClass *klass)
140 {
141 GObjectClass *object_class;
143 object_class = (GObjectClass *) klass;
145 parent_class = (GObjectClass *) g_type_class_ref(G_TYPE_OBJECT);
147 object_class->finalize = sp_object_finalize;
149 klass->child_added = sp_object_child_added;
150 klass->remove_child = sp_object_remove_child;
151 klass->order_changed = sp_object_order_changed;
153 klass->release = sp_object_release;
155 klass->build = sp_object_build;
157 klass->set = sp_object_private_set;
158 klass->write = sp_object_private_write;
159 }
161 /**
162 * Callback to initialize the SPObject object.
163 */
164 static void
165 sp_object_init(SPObject *object)
166 {
167 debug("id=%x, typename=%s",object, g_type_name_from_instance((GTypeInstance*)object));
169 object->hrefcount = 0;
170 object->_total_hrefcount = 0;
171 object->document = NULL;
172 object->children = object->_last_child = NULL;
173 object->parent = object->next = NULL;
174 object->repr = NULL;
175 object->id = NULL;
177 object->style = sp_style_new_from_object(object);
179 object->_collection_policy = SPObject::COLLECT_WITH_PARENT;
181 new (&object->_release_signal) sigc::signal<void, SPObject *>();
182 new (&object->_modified_signal) sigc::signal<void, SPObject *, unsigned int>();
183 new (&object->_delete_signal) sigc::signal<void, SPObject *>();
184 new (&object->_position_changed_signal) sigc::signal<void, SPObject *>();
185 object->_successor = NULL;
187 object->_label = NULL;
188 object->_default_label = NULL;
189 }
191 /**
192 * Callback to destroy all members and connections of object and itself.
193 */
194 static void
195 sp_object_finalize(GObject *object)
196 {
197 SPObject *spobject = (SPObject *)object;
199 g_free(spobject->_label);
200 g_free(spobject->_default_label);
201 spobject->_label = NULL;
202 spobject->_default_label = NULL;
204 if (spobject->_successor) {
205 sp_object_unref(spobject->_successor, NULL);
206 spobject->_successor = NULL;
207 }
209 if (((GObjectClass *) (parent_class))->finalize) {
210 (* ((GObjectClass *) (parent_class))->finalize)(object);
211 }
213 spobject->_release_signal.~signal();
214 spobject->_modified_signal.~signal();
215 spobject->_delete_signal.~signal();
216 spobject->_position_changed_signal.~signal();
217 }
219 namespace {
221 namespace Debug = Inkscape::Debug;
222 namespace Util = Inkscape::Util;
224 typedef Debug::SimpleEvent<Debug::Event::REFCOUNT> BaseRefCountEvent;
226 class RefCountEvent : public BaseRefCountEvent {
227 public:
228 RefCountEvent(SPObject *object, int bias, Util::ptr_shared<char> name)
229 : BaseRefCountEvent(name)
230 {
231 _addProperty("object", Util::format("%p", object));
232 _addProperty("class", Debug::demangle(g_type_name(G_TYPE_FROM_INSTANCE(object))));
233 _addProperty("new-refcount", Util::format("%d", G_OBJECT(object)->ref_count + bias));
234 }
235 };
237 class RefEvent : public RefCountEvent {
238 public:
239 RefEvent(SPObject *object)
240 : RefCountEvent(object, 1, Util::share_static_string("sp-object-ref"))
241 {}
242 };
244 class UnrefEvent : public RefCountEvent {
245 public:
246 UnrefEvent(SPObject *object)
247 : RefCountEvent(object, -1, Util::share_static_string("sp-object-unref"))
248 {}
249 };
251 }
253 /**
254 * Increase reference count of object, with possible debugging.
255 *
256 * \param owner If non-NULL, make debug log entry.
257 * \return object, NULL is error.
258 * \pre object points to real object
259 */
260 SPObject *
261 sp_object_ref(SPObject *object, SPObject *owner)
262 {
263 g_return_val_if_fail(object != NULL, NULL);
264 g_return_val_if_fail(SP_IS_OBJECT(object), NULL);
265 g_return_val_if_fail(!owner || SP_IS_OBJECT(owner), NULL);
267 Inkscape::Debug::EventTracker<RefEvent> tracker(object);
268 g_object_ref(G_OBJECT(object));
269 return object;
270 }
272 /**
273 * Decrease reference count of object, with possible debugging and
274 * finalization.
275 *
276 * \param owner If non-NULL, make debug log entry.
277 * \return always NULL
278 * \pre object points to real object
279 */
280 SPObject *
281 sp_object_unref(SPObject *object, SPObject *owner)
282 {
283 g_return_val_if_fail(object != NULL, NULL);
284 g_return_val_if_fail(SP_IS_OBJECT(object), NULL);
285 g_return_val_if_fail(!owner || SP_IS_OBJECT(owner), NULL);
287 Inkscape::Debug::EventTracker<UnrefEvent> tracker(object);
288 g_object_unref(G_OBJECT(object));
289 return NULL;
290 }
292 /**
293 * Increase weak refcount.
294 *
295 * Hrefcount is used for weak references, for example, to
296 * determine whether any graphical element references a certain gradient
297 * node.
298 * \param owner Ignored.
299 * \return object, NULL is error
300 * \pre object points to real object
301 */
302 SPObject *
303 sp_object_href(SPObject *object, gpointer owner)
304 {
305 g_return_val_if_fail(object != NULL, NULL);
306 g_return_val_if_fail(SP_IS_OBJECT(object), NULL);
308 object->hrefcount++;
309 object->_updateTotalHRefCount(1);
311 return object;
312 }
314 /**
315 * Decrease weak refcount.
316 *
317 * Hrefcount is used for weak references, for example, to determine whether
318 * any graphical element references a certain gradient node.
319 * \param owner Ignored.
320 * \return always NULL
321 * \pre object points to real object and hrefcount>0
322 */
323 SPObject *
324 sp_object_hunref(SPObject *object, gpointer owner)
325 {
326 g_return_val_if_fail(object != NULL, NULL);
327 g_return_val_if_fail(SP_IS_OBJECT(object), NULL);
328 g_return_val_if_fail(object->hrefcount > 0, NULL);
330 object->hrefcount--;
331 object->_updateTotalHRefCount(-1);
333 return NULL;
334 }
336 /**
337 * Adds increment to _total_hrefcount of object and its parents.
338 */
339 void
340 SPObject::_updateTotalHRefCount(int increment) {
341 SPObject *topmost_collectable = NULL;
342 for ( SPObject *iter = this ; iter ; iter = SP_OBJECT_PARENT(iter) ) {
343 iter->_total_hrefcount += increment;
344 if ( iter->_total_hrefcount < iter->hrefcount ) {
345 g_critical("HRefs overcounted");
346 }
347 if ( iter->_total_hrefcount == 0 &&
348 iter->_collection_policy != COLLECT_WITH_PARENT )
349 {
350 topmost_collectable = iter;
351 }
352 }
353 if (topmost_collectable) {
354 topmost_collectable->requestOrphanCollection();
355 }
356 }
358 /**
359 * True if object is non-NULL and this is some in/direct parent of object.
360 */
361 bool
362 SPObject::isAncestorOf(SPObject const *object) const {
363 g_return_val_if_fail(object != NULL, false);
364 object = SP_OBJECT_PARENT(object);
365 while (object) {
366 if ( object == this ) {
367 return true;
368 }
369 object = SP_OBJECT_PARENT(object);
370 }
371 return false;
372 }
374 namespace {
376 bool same_objects(SPObject const &a, SPObject const &b) {
377 return &a == &b;
378 }
380 }
382 /**
383 * Returns youngest object being parent to this and object.
384 */
385 SPObject const *
386 SPObject::nearestCommonAncestor(SPObject const *object) const {
387 g_return_val_if_fail(object != NULL, NULL);
389 using Inkscape::Algorithms::longest_common_suffix;
390 return longest_common_suffix<SPObject::ConstParentIterator>(this, object, NULL, &same_objects);
391 }
393 SPObject const *AncestorSon(SPObject const *obj, SPObject const *ancestor) {
394 if (obj == NULL || ancestor == NULL)
395 return NULL;
396 if (SP_OBJECT_PARENT(obj) == ancestor)
397 return obj;
398 return AncestorSon(SP_OBJECT_PARENT(obj), ancestor);
399 }
401 /**
402 * Compares height of objects in tree.
403 *
404 * Works for different-parent objects, so long as they have a common ancestor.
405 * \return \verbatim
406 * 0 positions are equivalent
407 * 1 first object's position is greater than the second
408 * -1 first object's position is less than the second \endverbatim
409 */
410 int
411 sp_object_compare_position(SPObject const *first, SPObject const *second)
412 {
413 if (first == second) return 0;
415 SPObject const *ancestor = first->nearestCommonAncestor(second);
416 if (ancestor == NULL) return 0; // cannot compare, no common ancestor!
418 // we have an object and its ancestor (should not happen when sorting selection)
419 if (ancestor == first)
420 return 1;
421 if (ancestor == second)
422 return -1;
424 SPObject const *to_first = AncestorSon(first, ancestor);
425 SPObject const *to_second = AncestorSon(second, ancestor);
427 g_assert(SP_OBJECT_PARENT(to_second) == SP_OBJECT_PARENT(to_first));
429 return sp_repr_compare_position(SP_OBJECT_REPR(to_first), SP_OBJECT_REPR(to_second));
430 }
433 /**
434 * Append repr as child of this object.
435 * \pre this is not a cloned object
436 */
437 SPObject *
438 SPObject::appendChildRepr(Inkscape::XML::Node *repr) {
439 if (!SP_OBJECT_IS_CLONED(this)) {
440 SP_OBJECT_REPR(this)->appendChild(repr);
441 return SP_OBJECT_DOCUMENT(this)->getObjectByRepr(repr);
442 } else {
443 g_critical("Attempt to append repr as child of cloned object");
444 return NULL;
445 }
446 }
448 /**
449 * Retrieves the children as a GSList object, optionally ref'ing the children
450 * in the process, if add_ref is specified.
451 */
452 GSList *SPObject::childList(bool add_ref, Action) {
453 GSList *l = NULL;
454 for (SPObject *child = sp_object_first_child(this) ; child != NULL; child = SP_OBJECT_NEXT(child) ) {
455 if (add_ref)
456 g_object_ref (G_OBJECT (child));
458 l = g_slist_prepend (l, child);
459 }
460 return l;
462 }
464 /** Gets the label property for the object or a default if no label
465 * is defined.
466 */
467 gchar const *
468 SPObject::label() const {
469 return _label;
470 }
472 /** Returns a default label property for the object. */
473 gchar const *
474 SPObject::defaultLabel() const {
475 if (_label) {
476 return _label;
477 } else {
478 if (!_default_label) {
479 gchar const *id=SP_OBJECT_ID(this);
480 if (id) {
481 _default_label = g_strdup_printf("#%s", id);
482 } else {
483 _default_label = g_strdup_printf("<%s>", SP_OBJECT_REPR(this)->name());
484 }
485 }
486 return _default_label;
487 }
488 }
490 /** Sets the label property for the object */
491 void
492 SPObject::setLabel(gchar const *label) {
493 SP_OBJECT_REPR(this)->setAttribute("inkscape:label", label, false);
494 }
497 /** Queues the object for orphan collection */
498 void
499 SPObject::requestOrphanCollection() {
500 g_return_if_fail(document != NULL);
501 document->queueForOrphanCollection(this);
503 /** \todo
504 * This is a temporary hack added to make fill&stroke rebuild its
505 * gradient list when the defs are vacuumed. gradient-vector.cpp
506 * listens to the modified signal on defs, and now we give it that
507 * signal. Mental says that this should be made automatic by
508 * merging SPObjectGroup with SPObject; SPObjectGroup would issue
509 * this signal automatically. Or maybe just derive SPDefs from
510 * SPObjectGroup?
511 */
513 this->requestModified(SP_OBJECT_CHILD_MODIFIED_FLAG);
514 }
516 /** Sends the delete signal to all children of this object recursively */
517 void
518 SPObject::_sendDeleteSignalRecursive() {
519 for (SPObject *child = sp_object_first_child(this); child; child = SP_OBJECT_NEXT(child)) {
520 child->_delete_signal.emit(child);
521 child->_sendDeleteSignalRecursive();
522 }
523 }
525 /**
526 * Deletes the object reference, unparenting it from its parent.
527 *
528 * If the \a propagate parameter is set to true, it emits a delete
529 * signal. If the \a propagate_descendants parameter is true, it
530 * recursively sends the delete signal to children.
531 */
532 void
533 SPObject::deleteObject(bool propagate, bool propagate_descendants)
534 {
535 sp_object_ref(this, NULL);
536 if (propagate) {
537 _delete_signal.emit(this);
538 }
539 if (propagate_descendants) {
540 this->_sendDeleteSignalRecursive();
541 }
543 Inkscape::XML::Node *repr=SP_OBJECT_REPR(this);
544 if (repr && sp_repr_parent(repr)) {
545 sp_repr_unparent(repr);
546 }
548 if (_successor) {
549 _successor->deleteObject(propagate, propagate_descendants);
550 }
551 sp_object_unref(this, NULL);
552 }
554 /**
555 * Put object into object tree, under parent, and behind prev;
556 * also update object's XML space.
557 */
558 void
559 sp_object_attach(SPObject *parent, SPObject *object, SPObject *prev)
560 {
561 g_return_if_fail(parent != NULL);
562 g_return_if_fail(SP_IS_OBJECT(parent));
563 g_return_if_fail(object != NULL);
564 g_return_if_fail(SP_IS_OBJECT(object));
565 g_return_if_fail(!prev || SP_IS_OBJECT(prev));
566 g_return_if_fail(!prev || prev->parent == parent);
567 g_return_if_fail(!object->parent);
569 sp_object_ref(object, parent);
570 object->parent = parent;
571 parent->_updateTotalHRefCount(object->_total_hrefcount);
573 SPObject *next;
574 if (prev) {
575 next = prev->next;
576 prev->next = object;
577 } else {
578 next = parent->children;
579 parent->children = object;
580 }
581 object->next = next;
582 if (!next) {
583 parent->_last_child = object;
584 }
585 if (!object->xml_space.set)
586 object->xml_space.value = parent->xml_space.value;
587 }
589 /**
590 * In list of object's siblings, move object behind prev.
591 */
592 void
593 sp_object_reorder(SPObject *object, SPObject *prev) {
594 g_return_if_fail(object != NULL);
595 g_return_if_fail(SP_IS_OBJECT(object));
596 g_return_if_fail(object->parent != NULL);
597 g_return_if_fail(object != prev);
598 g_return_if_fail(!prev || SP_IS_OBJECT(prev));
599 g_return_if_fail(!prev || prev->parent == object->parent);
601 SPObject *const parent=object->parent;
603 SPObject *old_prev=NULL;
604 for ( SPObject *child = parent->children ; child && child != object ;
605 child = child->next )
606 {
607 old_prev = child;
608 }
610 SPObject *next=object->next;
611 if (old_prev) {
612 old_prev->next = next;
613 } else {
614 parent->children = next;
615 }
616 if (!next) {
617 parent->_last_child = old_prev;
618 }
619 if (prev) {
620 next = prev->next;
621 prev->next = object;
622 } else {
623 next = parent->children;
624 parent->children = object;
625 }
626 object->next = next;
627 if (!next) {
628 parent->_last_child = object;
629 }
630 }
632 /**
633 * Remove object from parent's children, release and unref it.
634 */
635 void
636 sp_object_detach(SPObject *parent, SPObject *object) {
637 g_return_if_fail(parent != NULL);
638 g_return_if_fail(SP_IS_OBJECT(parent));
639 g_return_if_fail(object != NULL);
640 g_return_if_fail(SP_IS_OBJECT(object));
641 g_return_if_fail(object->parent == parent);
643 object->releaseReferences();
645 SPObject *prev=NULL;
646 for ( SPObject *child = parent->children ; child && child != object ;
647 child = child->next )
648 {
649 prev = child;
650 }
652 SPObject *next=object->next;
653 if (prev) {
654 prev->next = next;
655 } else {
656 parent->children = next;
657 }
658 if (!next) {
659 parent->_last_child = prev;
660 }
662 object->next = NULL;
663 object->parent = NULL;
665 parent->_updateTotalHRefCount(-object->_total_hrefcount);
666 sp_object_unref(object, parent);
667 }
669 /**
670 * Return object's child whose node pointer equals repr.
671 */
672 SPObject *
673 sp_object_get_child_by_repr(SPObject *object, Inkscape::XML::Node *repr)
674 {
675 g_return_val_if_fail(object != NULL, NULL);
676 g_return_val_if_fail(SP_IS_OBJECT(object), NULL);
677 g_return_val_if_fail(repr != NULL, NULL);
679 if (object->_last_child && SP_OBJECT_REPR(object->_last_child) == repr)
680 return object->_last_child; // optimization for common scenario
681 for ( SPObject *child = object->children ; child ; child = child->next ) {
682 if ( SP_OBJECT_REPR(child) == repr ) {
683 return child;
684 }
685 }
687 return NULL;
688 }
690 /**
691 * Callback for child_added event.
692 * Invoked whenever the given mutation event happens in the XML tree.
693 */
694 static void
695 sp_object_child_added(SPObject *object, Inkscape::XML::Node *child, Inkscape::XML::Node *ref)
696 {
697 GType type = sp_repr_type_lookup(child);
698 if (!type) {
699 return;
700 }
701 SPObject *ochild = SP_OBJECT(g_object_new(type, 0));
702 SPObject *prev = ref ? sp_object_get_child_by_repr(object, ref) : NULL;
703 sp_object_attach(object, ochild, prev);
704 sp_object_unref(ochild, NULL);
706 sp_object_invoke_build(ochild, object->document, child, SP_OBJECT_IS_CLONED(object));
707 }
709 /**
710 * Removes, releases and unrefs all children of object.
711 *
712 * This is the opposite of build. It has to be invoked as soon as the
713 * object is removed from the tree, even if it is still alive according
714 * to reference count. The frontend unregisters the object from the
715 * document and releases the SPRepr bindings; implementations should free
716 * state data and release all child objects. Invoking release on
717 * SPRoot destroys the whole document tree.
718 * \see sp_object_build()
719 */
720 static void sp_object_release(SPObject *object)
721 {
722 debug("id=%x, typename=%s", object, g_type_name_from_instance((GTypeInstance*)object));
723 while (object->children) {
724 sp_object_detach(object, object->children);
725 }
726 }
728 /**
729 * Remove object's child whose node equals repr, release and
730 * unref it.
731 *
732 * Invoked whenever the given mutation event happens in the XML
733 * tree, BEFORE removal from the XML tree happens, so grouping
734 * objects can safely release the child data.
735 */
736 static void
737 sp_object_remove_child(SPObject *object, Inkscape::XML::Node *child)
738 {
739 debug("id=%x, typename=%s", object, g_type_name_from_instance((GTypeInstance*)object));
740 SPObject *ochild = sp_object_get_child_by_repr(object, child);
741 g_return_if_fail (ochild != NULL || !strcmp("comment", child->name())); // comments have no objects
742 if (ochild)
743 sp_object_detach(object, ochild);
744 }
746 /**
747 * Move object corresponding to child after sibling object corresponding
748 * to new_ref.
749 * Invoked whenever the given mutation event happens in the XML tree.
750 * \param old_ref Ignored
751 */
752 static void sp_object_order_changed(SPObject *object, Inkscape::XML::Node *child, Inkscape::XML::Node *old_ref,
753 Inkscape::XML::Node *new_ref)
754 {
755 SPObject *ochild = sp_object_get_child_by_repr(object, child);
756 g_return_if_fail(ochild != NULL);
757 SPObject *prev = new_ref ? sp_object_get_child_by_repr(object, new_ref) : NULL;
758 sp_object_reorder(ochild, prev);
759 ochild->_position_changed_signal.emit(ochild);
760 }
762 /**
763 * Virtual build callback.
764 *
765 * This has to be invoked immediately after creation of an SPObject. The
766 * frontend method ensures that the new object is properly attached to
767 * the document and repr; implementation then will parse all of the attributes,
768 * generate the children objects and so on. Invoking build on the SPRoot
769 * object results in creation of the whole document tree (this is, what
770 * SPDocument does after the creation of the XML tree).
771 * \see sp_object_release()
772 */
773 static void
774 sp_object_build(SPObject *object, SPDocument *document, Inkscape::XML::Node *repr)
775 {
776 /* Nothing specific here */
777 debug("id=%x, typename=%s", object, g_type_name_from_instance((GTypeInstance*)object));
779 sp_object_read_attr(object, "xml:space");
780 sp_object_read_attr(object, "inkscape:label");
781 sp_object_read_attr(object, "inkscape:collect");
783 for (Inkscape::XML::Node *rchild = repr->firstChild() ; rchild != NULL; rchild = rchild->next()) {
784 GType type = sp_repr_type_lookup(rchild);
785 if (!type) {
786 continue;
787 }
788 SPObject *child = SP_OBJECT(g_object_new(type, 0));
789 sp_object_attach(object, child, object->lastChild());
790 sp_object_unref(child, NULL);
791 sp_object_invoke_build(child, document, rchild, SP_OBJECT_IS_CLONED(object));
792 }
793 }
795 void
796 sp_object_invoke_build(SPObject *object, SPDocument *document, Inkscape::XML::Node *repr, unsigned int cloned)
797 {
798 debug("id=%x, typename=%s", object, g_type_name_from_instance((GTypeInstance*)object));
800 g_assert(object != NULL);
801 g_assert(SP_IS_OBJECT(object));
802 g_assert(document != NULL);
803 g_assert(repr != NULL);
805 g_assert(object->document == NULL);
806 g_assert(object->repr == NULL);
807 g_assert(object->id == NULL);
809 /* Bookkeeping */
811 object->document = document;
812 object->repr = repr;
813 Inkscape::GC::anchor(repr);
814 object->cloned = cloned;
816 if (!SP_OBJECT_IS_CLONED(object)) {
817 object->document->bindObjectToRepr(object->repr, object);
819 if (Inkscape::XML::id_permitted(object->repr)) {
820 /* If we are not cloned, force unique id */
821 gchar const *id = object->repr->attribute("id");
822 gchar *realid = sp_object_get_unique_id(object, id);
823 g_assert(realid != NULL);
825 object->document->bindObjectToId(realid, object);
826 object->id = realid;
828 /* Redefine ID, if required */
829 if ((id == NULL) || (strcmp(id, realid) != 0)) {
830 bool saved = sp_document_get_undo_sensitive(document);
831 sp_document_set_undo_sensitive(document, false);
832 object->repr->setAttribute("id", realid);
833 sp_document_set_undo_sensitive(document, saved);
834 }
835 }
836 } else {
837 g_assert(object->id == NULL);
838 }
840 /* Invoke derived methods, if any */
842 if (((SPObjectClass *) G_OBJECT_GET_CLASS(object))->build) {
843 (*((SPObjectClass *) G_OBJECT_GET_CLASS(object))->build)(object, document, repr);
844 }
846 /* Signalling (should be connected AFTER processing derived methods */
847 sp_repr_add_listener(repr, &object_event_vector, object);
848 }
850 void SPObject::releaseReferences() {
851 g_assert(this->document);
852 g_assert(this->repr);
854 sp_repr_remove_listener_by_data(this->repr, this);
856 this->_release_signal.emit(this);
857 SPObjectClass *klass=(SPObjectClass *)G_OBJECT_GET_CLASS(this);
858 if (klass->release) {
859 klass->release(this);
860 }
862 /* all hrefs should be released by the "release" handlers */
863 g_assert(this->hrefcount == 0);
865 if (!SP_OBJECT_IS_CLONED(this)) {
866 if (this->id) {
867 this->document->bindObjectToId(this->id, NULL);
868 }
869 g_free(this->id);
870 this->id = NULL;
872 g_free(this->_default_label);
873 this->_default_label = NULL;
875 this->document->bindObjectToRepr(this->repr, NULL);
876 } else {
877 g_assert(!this->id);
878 }
880 if (this->style) {
881 this->style = sp_style_unref(this->style);
882 }
884 Inkscape::GC::release(this->repr);
886 this->document = NULL;
887 this->repr = NULL;
888 }
890 /**
891 * Callback for child_added node event.
892 */
893 static void
894 sp_object_repr_child_added(Inkscape::XML::Node *repr, Inkscape::XML::Node *child, Inkscape::XML::Node *ref, gpointer data)
895 {
896 SPObject *object = SP_OBJECT(data);
898 if (((SPObjectClass *) G_OBJECT_GET_CLASS(object))->child_added)
899 (*((SPObjectClass *)G_OBJECT_GET_CLASS(object))->child_added)(object, child, ref);
900 }
902 /**
903 * Callback for remove_child node event.
904 */
905 static void
906 sp_object_repr_child_removed(Inkscape::XML::Node *repr, Inkscape::XML::Node *child, Inkscape::XML::Node *ref, gpointer data)
907 {
908 SPObject *object = SP_OBJECT(data);
910 if (((SPObjectClass *) G_OBJECT_GET_CLASS(object))->remove_child) {
911 (* ((SPObjectClass *)G_OBJECT_GET_CLASS(object))->remove_child)(object, child);
912 }
913 }
915 /**
916 * Callback for order_changed node event.
917 *
918 * \todo fixme:
919 */
920 static void
921 sp_object_repr_order_changed(Inkscape::XML::Node *repr, Inkscape::XML::Node *child, Inkscape::XML::Node *old, Inkscape::XML::Node *newer, gpointer data)
922 {
923 SPObject *object = SP_OBJECT(data);
925 if (((SPObjectClass *) G_OBJECT_GET_CLASS(object))->order_changed) {
926 (* ((SPObjectClass *)G_OBJECT_GET_CLASS(object))->order_changed)(object, child, old, newer);
927 }
928 }
930 /**
931 * Callback for set event.
932 */
933 static void
934 sp_object_private_set(SPObject *object, unsigned int key, gchar const *value)
935 {
936 g_assert(key != SP_ATTR_INVALID);
938 switch (key) {
939 case SP_ATTR_ID:
940 if ( !SP_OBJECT_IS_CLONED(object) && object->repr->type() == Inkscape::XML::ELEMENT_NODE ) {
941 SPDocument *document=object->document;
942 SPObject *conflict=NULL;
944 if (value) {
945 conflict = document->getObjectById((char const *)value);
946 }
947 if ( conflict && conflict != object ) {
948 sp_object_ref(conflict, NULL);
949 // give the conflicting object a new ID
950 gchar *new_conflict_id = sp_object_get_unique_id(conflict, NULL);
951 SP_OBJECT_REPR(conflict)->setAttribute("id", new_conflict_id);
952 g_free(new_conflict_id);
953 sp_object_unref(conflict, NULL);
954 }
956 if (object->id) {
957 document->bindObjectToId(object->id, NULL);
958 g_free(object->id);
959 }
961 if (value) {
962 object->id = g_strdup((char const*)value);
963 document->bindObjectToId(object->id, object);
964 } else {
965 object->id = NULL;
966 }
968 g_free(object->_default_label);
969 object->_default_label = NULL;
970 }
971 break;
972 case SP_ATTR_INKSCAPE_LABEL:
973 g_free(object->_label);
974 if (value) {
975 object->_label = g_strdup(value);
976 } else {
977 object->_label = NULL;
978 }
979 g_free(object->_default_label);
980 object->_default_label = NULL;
981 break;
982 case SP_ATTR_INKSCAPE_COLLECT:
983 if ( value && !strcmp(value, "always") ) {
984 object->setCollectionPolicy(SPObject::ALWAYS_COLLECT);
985 } else {
986 object->setCollectionPolicy(SPObject::COLLECT_WITH_PARENT);
987 }
988 break;
989 case SP_ATTR_XML_SPACE:
990 if (value && !strcmp(value, "preserve")) {
991 object->xml_space.value = SP_XML_SPACE_PRESERVE;
992 object->xml_space.set = TRUE;
993 } else if (value && !strcmp(value, "default")) {
994 object->xml_space.value = SP_XML_SPACE_DEFAULT;
995 object->xml_space.set = TRUE;
996 } else if (object->parent) {
997 SPObject *parent;
998 parent = object->parent;
999 object->xml_space.value = parent->xml_space.value;
1000 }
1001 object->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
1002 break;
1003 case SP_ATTR_STYLE:
1004 sp_style_read_from_object(object->style, object);
1005 object->requestDisplayUpdate(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_STYLE_MODIFIED_FLAG);
1006 break;
1007 default:
1008 break;
1009 }
1010 }
1012 /**
1013 * Call virtual set() function of object.
1014 */
1015 void
1016 sp_object_set(SPObject *object, unsigned int key, gchar const *value)
1017 {
1018 g_assert(object != NULL);
1019 g_assert(SP_IS_OBJECT(object));
1021 if (((SPObjectClass *) G_OBJECT_GET_CLASS(object))->set) {
1022 ((SPObjectClass *) G_OBJECT_GET_CLASS(object))->set(object, key, value);
1023 }
1024 }
1026 /**
1027 * Read value of key attribute from XML node into object.
1028 */
1029 void
1030 sp_object_read_attr(SPObject *object, gchar const *key)
1031 {
1032 g_assert(object != NULL);
1033 g_assert(SP_IS_OBJECT(object));
1034 g_assert(key != NULL);
1036 g_assert(object->repr != NULL);
1038 unsigned int keyid = sp_attribute_lookup(key);
1039 if (keyid != SP_ATTR_INVALID) {
1040 /* Retrieve the 'key' attribute from the object's XML representation */
1041 gchar const *value = object->repr->attribute(key);
1043 sp_object_set(object, keyid, value);
1044 }
1045 }
1047 /**
1048 * Callback for attr_changed node event.
1049 */
1050 static void
1051 sp_object_repr_attr_changed(Inkscape::XML::Node *repr, gchar const *key, gchar const *oldval, gchar const *newval, bool is_interactive, gpointer data)
1052 {
1053 SPObject *object = SP_OBJECT(data);
1055 sp_object_read_attr(object, key);
1057 // manual changes to extension attributes require the normal
1058 // attributes, which depend on them, to be updated immediately
1059 if (is_interactive) {
1060 object->updateRepr(repr, 0);
1061 }
1062 }
1064 /**
1065 * Callback for content_changed node event.
1066 */
1067 static void
1068 sp_object_repr_content_changed(Inkscape::XML::Node *repr, gchar const *oldcontent, gchar const *newcontent, gpointer data)
1069 {
1070 SPObject *object = SP_OBJECT(data);
1072 if (((SPObjectClass *) G_OBJECT_GET_CLASS(object))->read_content)
1073 (*((SPObjectClass *) G_OBJECT_GET_CLASS(object))->read_content)(object);
1074 }
1076 /**
1077 * Return string representation of space value.
1078 */
1079 static gchar const*
1080 sp_xml_get_space_string(unsigned int space)
1081 {
1082 switch (space) {
1083 case SP_XML_SPACE_DEFAULT:
1084 return "default";
1085 case SP_XML_SPACE_PRESERVE:
1086 return "preserve";
1087 default:
1088 return NULL;
1089 }
1090 }
1092 /**
1093 * Callback for write event.
1094 */
1095 static Inkscape::XML::Node *
1096 sp_object_private_write(SPObject *object, Inkscape::XML::Node *repr, guint flags)
1097 {
1098 if (!repr && (flags & SP_OBJECT_WRITE_BUILD)) {
1099 repr = SP_OBJECT_REPR(object)->duplicate();
1100 if (!( flags & SP_OBJECT_WRITE_EXT )) {
1101 repr->setAttribute("inkscape:collect", NULL);
1102 }
1103 } else {
1104 repr->setAttribute("id", object->id);
1106 if (object->xml_space.set) {
1107 char const *xml_space;
1108 xml_space = sp_xml_get_space_string(object->xml_space.value);
1109 repr->setAttribute("xml:space", xml_space);
1110 }
1112 if ( flags & SP_OBJECT_WRITE_EXT &&
1113 object->collectionPolicy() == SPObject::ALWAYS_COLLECT )
1114 {
1115 repr->setAttribute("inkscape:collect", "always");
1116 } else {
1117 repr->setAttribute("inkscape:collect", NULL);
1118 }
1120 SPStyle const *const obj_style = SP_OBJECT_STYLE(object);
1121 if (obj_style) {
1122 gchar *s = sp_style_write_string(obj_style, SP_STYLE_FLAG_IFSET);
1123 repr->setAttribute("style", ( *s ? s : NULL ));
1124 g_free(s);
1125 } else {
1126 /** \todo I'm not sure what to do in this case. Bug #1165868
1127 * suggests that it can arise, but the submitter doesn't know
1128 * how to do so reliably. The main two options are either
1129 * leave repr's style attribute unchanged, or explicitly clear it.
1130 * Must also consider what to do with property attributes for
1131 * the element; see below.
1132 */
1133 char const *style_str = repr->attribute("style");
1134 if (!style_str) {
1135 style_str = "NULL";
1136 }
1137 g_warning("Item's style is NULL; repr style attribute is %s", style_str);
1138 }
1140 /** \note We treat object->style as authoritative. Its effects have
1141 * been written to the style attribute above; any properties that are
1142 * unset we take to be deliberately unset (e.g. so that clones can
1143 * override the property).
1144 *
1145 * Note that the below has an undesirable consequence of changing the
1146 * appearance on renderers that lack CSS support (e.g. SVG tiny);
1147 * possibly we should write property attributes instead of a style
1148 * attribute.
1149 */
1150 sp_style_unset_property_attrs (object);
1151 }
1153 return repr;
1154 }
1156 /**
1157 * Update this object's XML node with flags value.
1158 */
1159 Inkscape::XML::Node *
1160 SPObject::updateRepr(unsigned int flags) {
1161 if (!SP_OBJECT_IS_CLONED(this)) {
1162 Inkscape::XML::Node *repr=SP_OBJECT_REPR(this);
1163 if (repr) {
1164 return updateRepr(repr, flags);
1165 } else {
1166 g_critical("Attempt to update non-existent repr");
1167 return NULL;
1168 }
1169 } else {
1170 /* cloned objects have no repr */
1171 return NULL;
1172 }
1173 }
1175 Inkscape::XML::Node *
1176 SPObject::updateRepr(Inkscape::XML::Node *repr, unsigned int flags) {
1177 if (SP_OBJECT_IS_CLONED(this)) {
1178 /* cloned objects have no repr */
1179 return NULL;
1180 }
1181 if (((SPObjectClass *) G_OBJECT_GET_CLASS(this))->write) {
1182 if (!(flags & SP_OBJECT_WRITE_BUILD) && !repr) {
1183 repr = SP_OBJECT_REPR(this);
1184 }
1185 return ((SPObjectClass *) G_OBJECT_GET_CLASS(this))->write(this, repr, flags);
1186 } else {
1187 g_warning("Class %s does not implement ::write", G_OBJECT_TYPE_NAME(this));
1188 if (!repr) {
1189 if (flags & SP_OBJECT_WRITE_BUILD) {
1190 repr = SP_OBJECT_REPR(this)->duplicate();
1191 }
1192 /// \todo fixme: else probably error (Lauris) */
1193 } else {
1194 repr->mergeFrom(SP_OBJECT_REPR(this), "id");
1195 }
1196 return repr;
1197 }
1198 }
1200 /* Modification */
1202 /**
1203 * Add \a flags to \a object's as dirtiness flags, and
1204 * recursively add CHILD_MODIFIED flag to
1205 * parent and ancestors (as far up as necessary).
1206 */
1207 void
1208 SPObject::requestDisplayUpdate(unsigned int flags)
1209 {
1210 g_return_if_fail( this->document != NULL );
1212 if (update_in_progress) {
1213 g_print("WARNING: Requested update while update in progress, counter = %d\n", update_in_progress);
1214 }
1216 /* requestModified must be used only to set one of SP_OBJECT_MODIFIED_FLAG or
1217 * SP_OBJECT_CHILD_MODIFIED_FLAG */
1218 g_return_if_fail(!(flags & SP_OBJECT_PARENT_MODIFIED_FLAG));
1219 g_return_if_fail((flags & SP_OBJECT_MODIFIED_FLAG) || (flags & SP_OBJECT_CHILD_MODIFIED_FLAG));
1220 g_return_if_fail(!((flags & SP_OBJECT_MODIFIED_FLAG) && (flags & SP_OBJECT_CHILD_MODIFIED_FLAG)));
1222 bool already_propagated = (!(this->uflags & (SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_CHILD_MODIFIED_FLAG)));
1224 this->uflags |= flags;
1226 /* If requestModified has already been called on this object or one of its children, then we
1227 * don't need to set CHILD_MODIFIED on our ancestors because it's already been done.
1228 */
1229 if (already_propagated) {
1230 SPObject *parent = SP_OBJECT_PARENT(this);
1231 if (parent) {
1232 parent->requestDisplayUpdate(SP_OBJECT_CHILD_MODIFIED_FLAG);
1233 } else {
1234 sp_document_request_modified(SP_OBJECT_DOCUMENT(this));
1235 }
1236 }
1237 }
1239 /**
1240 * Update views
1241 */
1242 void
1243 SPObject::updateDisplay(SPCtx *ctx, unsigned int flags)
1244 {
1245 g_return_if_fail(!(flags & ~SP_OBJECT_MODIFIED_CASCADE));
1247 update_in_progress ++;
1249 #ifdef SP_OBJECT_DEBUG_CASCADE
1250 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);
1251 #endif
1253 /* Get this flags */
1254 flags |= this->uflags;
1255 /* Copy flags to modified cascade for later processing */
1256 this->mflags |= this->uflags;
1257 /* We have to clear flags here to allow rescheduling update */
1258 this->uflags = 0;
1260 // Merge style if we have good reasons to think that parent style is changed */
1261 /** \todo
1262 * I am not sure whether we should check only propagated
1263 * flag. We are currently assuming that style parsing is
1264 * done immediately. I think this is correct (Lauris).
1265 */
1266 if ((flags & SP_OBJECT_STYLE_MODIFIED_FLAG) && (flags & SP_OBJECT_PARENT_MODIFIED_FLAG)) {
1267 if (this->style && this->parent) {
1268 sp_style_merge_from_parent(this->style, this->parent->style);
1269 }
1270 }
1272 if (((SPObjectClass *) G_OBJECT_GET_CLASS(this))->update)
1273 ((SPObjectClass *) G_OBJECT_GET_CLASS(this))->update(this, ctx, flags);
1275 update_in_progress --;
1276 }
1278 /**
1279 * Request modified always bubbles *up* the tree, as opposed to
1280 * request display update, which trickles down and relies on the
1281 * flags set during this pass...
1282 */
1283 void
1284 SPObject::requestModified(unsigned int flags)
1285 {
1286 g_return_if_fail( this->document != NULL );
1288 /* requestModified must be used only to set one of SP_OBJECT_MODIFIED_FLAG or
1289 * SP_OBJECT_CHILD_MODIFIED_FLAG */
1290 g_return_if_fail(!(flags & SP_OBJECT_PARENT_MODIFIED_FLAG));
1291 g_return_if_fail((flags & SP_OBJECT_MODIFIED_FLAG) || (flags & SP_OBJECT_CHILD_MODIFIED_FLAG));
1292 g_return_if_fail(!((flags & SP_OBJECT_MODIFIED_FLAG) && (flags & SP_OBJECT_CHILD_MODIFIED_FLAG)));
1294 bool already_propagated = (!(this->mflags & (SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_CHILD_MODIFIED_FLAG)));
1296 this->mflags |= flags;
1298 /* If requestModified has already been called on this object or one of its children, then we
1299 * don't need to set CHILD_MODIFIED on our ancestors because it's already been done.
1300 */
1301 if (already_propagated) {
1302 SPObject *parent=SP_OBJECT_PARENT(this);
1303 if (parent) {
1304 parent->requestModified(SP_OBJECT_CHILD_MODIFIED_FLAG);
1305 } else {
1306 sp_document_request_modified(SP_OBJECT_DOCUMENT(this));
1307 }
1308 }
1309 }
1311 /**
1312 * Emits the MODIFIED signal with the object's flags.
1313 * The object's mflags are the original set aside during the update pass for
1314 * later delivery here. Once emitModified() is called, those flags don't
1315 * need to be stored any longer.
1316 */
1317 void
1318 SPObject::emitModified(unsigned int flags)
1319 {
1320 /* only the MODIFIED_CASCADE flag is legal here */
1321 g_return_if_fail(!(flags & ~SP_OBJECT_MODIFIED_CASCADE));
1323 #ifdef SP_OBJECT_DEBUG_CASCADE
1324 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);
1325 #endif
1327 flags |= this->mflags;
1328 /* We have to clear mflags beforehand, as signal handlers may
1329 * make changes and therefore queue new modification notifications
1330 * themselves. */
1331 this->mflags = 0;
1333 g_object_ref(G_OBJECT(this));
1334 SPObjectClass *klass=(SPObjectClass *)G_OBJECT_GET_CLASS(this);
1335 if (klass->modified) {
1336 klass->modified(this, flags);
1337 }
1338 _modified_signal.emit(this, flags);
1339 g_object_unref(G_OBJECT(this));
1340 }
1342 /*
1343 * Get and set descriptive parameters
1344 *
1345 * These are inefficent, so they are not intended to be used interactively
1346 */
1348 gchar const *
1349 sp_object_title_get(SPObject *object)
1350 {
1351 return NULL;
1352 }
1354 gchar const *
1355 sp_object_description_get(SPObject *object)
1356 {
1357 return NULL;
1358 }
1360 unsigned int
1361 sp_object_title_set(SPObject *object, gchar const *title)
1362 {
1363 return FALSE;
1364 }
1366 unsigned int
1367 sp_object_description_set(SPObject *object, gchar const *desc)
1368 {
1369 return FALSE;
1370 }
1372 gchar const *
1373 sp_object_tagName_get(SPObject const *object, SPException *ex)
1374 {
1375 /* If exception is not clear, return */
1376 if (!SP_EXCEPTION_IS_OK(ex)) {
1377 return NULL;
1378 }
1380 /// \todo fixme: Exception if object is NULL? */
1381 return object->repr->name();
1382 }
1384 gchar const *
1385 sp_object_getAttribute(SPObject const *object, gchar const *key, SPException *ex)
1386 {
1387 /* If exception is not clear, return */
1388 if (!SP_EXCEPTION_IS_OK(ex)) {
1389 return NULL;
1390 }
1392 /// \todo fixme: Exception if object is NULL? */
1393 return (gchar const *) object->repr->attribute(key);
1394 }
1396 void
1397 sp_object_setAttribute(SPObject *object, gchar const *key, gchar const *value, SPException *ex)
1398 {
1399 /* If exception is not clear, return */
1400 g_return_if_fail(SP_EXCEPTION_IS_OK(ex));
1402 /// \todo fixme: Exception if object is NULL? */
1403 if (!sp_repr_set_attr(object->repr, key, value)) {
1404 ex->code = SP_NO_MODIFICATION_ALLOWED_ERR;
1405 }
1406 }
1408 void
1409 sp_object_removeAttribute(SPObject *object, gchar const *key, SPException *ex)
1410 {
1411 /* If exception is not clear, return */
1412 g_return_if_fail(SP_EXCEPTION_IS_OK(ex));
1414 /// \todo fixme: Exception if object is NULL? */
1415 if (!sp_repr_set_attr(object->repr, key, NULL)) {
1416 ex->code = SP_NO_MODIFICATION_ALLOWED_ERR;
1417 }
1418 }
1420 /* Helper */
1422 static gchar *
1423 sp_object_get_unique_id(SPObject *object, gchar const *id)
1424 {
1425 static unsigned long count = 0;
1427 g_assert(SP_IS_OBJECT(object));
1429 count++;
1431 gchar const *name = object->repr->name();
1432 g_assert(name != NULL);
1434 gchar const *local = strchr(name, ':');
1435 if (local) {
1436 name = local + 1;
1437 }
1439 if (id != NULL) {
1440 if (object->document->getObjectById(id) == NULL) {
1441 return g_strdup(id);
1442 }
1443 }
1445 size_t const name_len = strlen(name);
1446 size_t const buflen = name_len + (sizeof(count) * 10 / 4) + 1;
1447 gchar *const buf = (gchar *) g_malloc(buflen);
1448 memcpy(buf, name, name_len);
1449 gchar *const count_buf = buf + name_len;
1450 size_t const count_buflen = buflen - name_len;
1451 do {
1452 ++count;
1453 g_snprintf(count_buf, count_buflen, "%lu", count);
1454 } while ( object->document->getObjectById(buf) != NULL );
1455 return buf;
1456 }
1458 /* Style */
1460 /**
1461 * Returns an object style property.
1462 *
1463 * \todo
1464 * fixme: Use proper CSS parsing. The current version is buggy
1465 * in a number of situations where key is a substring of the
1466 * style string other than as a property name (including
1467 * where key is a substring of a property name), and is also
1468 * buggy in its handling of inheritance for properties that
1469 * aren't inherited by default. It also doesn't allow for
1470 * the case where the property is specified but with an invalid
1471 * value (in which case I believe the CSS2 error-handling
1472 * behaviour applies, viz. behave as if the property hadn't
1473 * been specified). Also, the current code doesn't use CRSelEng
1474 * stuff to take a value from stylesheets. Also, we aren't
1475 * setting any hooks to force an update for changes in any of
1476 * the inputs (i.e., in any of the elements that this function
1477 * queries).
1478 *
1479 * \par
1480 * Given that the default value for a property depends on what
1481 * property it is (e.g., whether to inherit or not), and given
1482 * the above comment about ignoring invalid values, and that the
1483 * repr parent isn't necessarily the right element to inherit
1484 * from (e.g., maybe we need to inherit from the referencing
1485 * <use> element instead), we should probably make the caller
1486 * responsible for ascending the repr tree as necessary.
1487 */
1488 gchar const *
1489 sp_object_get_style_property(SPObject const *object, gchar const *key, gchar const *def)
1490 {
1491 g_return_val_if_fail(object != NULL, NULL);
1492 g_return_val_if_fail(SP_IS_OBJECT(object), NULL);
1493 g_return_val_if_fail(key != NULL, NULL);
1495 gchar const *style = object->repr->attribute("style");
1496 if (style) {
1497 size_t const len = strlen(key);
1498 char const *p;
1499 while ( (p = strstr(style, key))
1500 != NULL )
1501 {
1502 p += len;
1503 while ((*p <= ' ') && *p) p++;
1504 if (*p++ != ':') break;
1505 while ((*p <= ' ') && *p) p++;
1506 size_t const inherit_len = sizeof("inherit") - 1;
1507 if (*p
1508 && !(strneq(p, "inherit", inherit_len)
1509 && (p[inherit_len] == '\0'
1510 || p[inherit_len] == ';'
1511 || g_ascii_isspace(p[inherit_len])))) {
1512 return p;
1513 }
1514 }
1515 }
1516 gchar const *val = object->repr->attribute(key);
1517 if (val && !streq(val, "inherit")) {
1518 return val;
1519 }
1520 if (object->parent) {
1521 return sp_object_get_style_property(object->parent, key, def);
1522 }
1524 return def;
1525 }
1527 /**
1528 * Lifts SVG version of all root objects to version.
1529 */
1530 void
1531 SPObject::_requireSVGVersion(Inkscape::Version version) {
1532 for ( SPObject::ParentIterator iter=this ; iter ; ++iter ) {
1533 SPObject *object=iter;
1534 if (SP_IS_ROOT(object)) {
1535 SPRoot *root=SP_ROOT(object);
1536 if ( root->version.svg < version ) {
1537 root->version.svg = version;
1538 }
1539 }
1540 }
1541 }
1543 /**
1544 * Return sodipodi version of first root ancestor or (0,0).
1545 */
1546 Inkscape::Version
1547 sp_object_get_sodipodi_version(SPObject *object)
1548 {
1549 static Inkscape::Version const zero_version(0, 0);
1551 while (object) {
1552 if (SP_IS_ROOT(object)) {
1553 return SP_ROOT(object)->version.sodipodi;
1554 }
1555 object = SP_OBJECT_PARENT(object);
1556 }
1558 return zero_version;
1559 }
1561 /**
1562 * Returns previous object in sibling list or NULL.
1563 */
1564 SPObject *
1565 sp_object_prev(SPObject *child)
1566 {
1567 SPObject *parent = SP_OBJECT_PARENT(child);
1568 for ( SPObject *i = sp_object_first_child(parent); i; i = SP_OBJECT_NEXT(i) ) {
1569 if (SP_OBJECT_NEXT(i) == child)
1570 return i;
1571 }
1572 return NULL;
1573 }
1576 /*
1577 Local Variables:
1578 mode:c++
1579 c-file-style:"stroustrup"
1580 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
1581 indent-tabs-mode:nil
1582 fill-column:99
1583 End:
1584 */
1585 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :