1 #ifndef SP_OBJECT_H_SEEN
2 #define SP_OBJECT_H_SEEN
4 /** \file
5 * Abstract base class for all nodes
6 *
7 * Authors:
8 * Lauris Kaplinski <lauris@kaplinski.com>
9 *
10 * Copyright (C) 1999-2002 authors
11 * Copyright (C) 2001-2002 Ximian, Inc.
12 *
13 * Released under GNU GPL, read the file 'COPYING' for more information
14 */
16 /* SPObject flags */
18 /* Async modification flags */
19 #define SP_OBJECT_MODIFIED_FLAG (1 << 0)
20 #define SP_OBJECT_CHILD_MODIFIED_FLAG (1 << 1)
21 #define SP_OBJECT_PARENT_MODIFIED_FLAG (1 << 2)
22 #define SP_OBJECT_STYLE_MODIFIED_FLAG (1 << 3)
23 #define SP_OBJECT_VIEWPORT_MODIFIED_FLAG (1 << 4)
24 #define SP_OBJECT_USER_MODIFIED_FLAG_A (1 << 5)
25 #define SP_OBJECT_USER_MODIFIED_FLAG_B (1 << 6)
26 #define SP_OBJECT_USER_MODIFIED_FLAG_C (1 << 7)
28 /* Conveneience */
29 #define SP_OBJECT_FLAGS_ALL 0xff
31 /* Flags that mark object as modified */
32 /* Object, Child, Style, Viewport, User */
33 #define SP_OBJECT_MODIFIED_STATE (SP_OBJECT_FLAGS_ALL & ~(SP_OBJECT_PARENT_MODIFIED_FLAG))
35 /* Flags that will propagate downstreams */
36 /* Parent, Style, Viewport, User */
37 #define SP_OBJECT_MODIFIED_CASCADE (SP_OBJECT_FLAGS_ALL & ~(SP_OBJECT_MODIFIED_FLAG | SP_OBJECT_CHILD_MODIFIED_FLAG))
39 /* Generic */
40 #define SP_OBJECT_IS_CLONED(o) (((SPObject *) (o))->cloned)
42 /* Write flags */
43 #define SP_OBJECT_WRITE_BUILD (1 << 0)
44 #define SP_OBJECT_WRITE_EXT (1 << 1)
45 #define SP_OBJECT_WRITE_ALL (1 << 2)
47 /* Convenience stuff */
48 #define SP_OBJECT_ID(o) (((SPObject *) (o))->id)
49 #define SP_OBJECT_REPR(o) (((SPObject *) (o))->repr)
50 #define SP_OBJECT_DOCUMENT(o) (((SPObject *) (o))->document)
51 #define SP_OBJECT_PARENT(o) (((SPObject *) (o))->parent)
52 #define SP_OBJECT_NEXT(o) (((SPObject *) (o))->next)
53 #define SP_OBJECT_PREV(o) (sp_object_prev((SPObject *) (o)))
54 #define SP_OBJECT_HREFCOUNT(o) (((SPObject *) (o))->hrefcount)
55 #define SP_OBJECT_STYLE(o) (((SPObject *) (o))->style)
58 #include <glib-object.h>
59 #include <sigc++/connection.h>
60 #include <sigc++/functors/slot.h>
61 #include <sigc++/signal.h>
63 #include "forward.h"
64 #include "version.h"
65 #include "util/forward-pointer-iterator.h"
67 namespace Inkscape {
68 namespace XML {
69 class Node;
70 }
71 }
74 typedef enum {
75 SP_NO_EXCEPTION,
76 SP_INDEX_SIZE_ERR,
77 SP_DOMSTRING_SIZE_ERR,
78 SP_HIERARCHY_REQUEST_ERR,
79 SP_WRONG_DOCUMENT_ERR,
80 SP_INVALID_CHARACTER_ERR,
81 SP_NO_DATA_ALLOWED_ERR,
82 SP_NO_MODIFICATION_ALLOWED_ERR,
83 SP_NOT_FOUND_ERR,
84 SP_NOT_SUPPORTED_ERR,
85 SP_INUSE_ATTRIBUTE_ERR,
86 SP_INVALID_STATE_ERR,
87 SP_SYNTAX_ERR,
88 SP_INVALID_MODIFICATION_ERR,
89 SP_NAMESPACE_ERR,
90 SP_INVALID_ACCESS_ERR
91 } SPExceptionType;
93 class SPException;
95 /// An attempt to implement exceptions, unused?
96 struct SPException {
97 SPExceptionType code;
98 };
100 #define SP_EXCEPTION_INIT(ex) {(ex)->code = SP_NO_EXCEPTION;}
101 #define SP_EXCEPTION_IS_OK(ex) (!(ex) || ((ex)->code == SP_NO_EXCEPTION))
103 class SPCtx;
105 /// Unused
106 struct SPCtx {
107 unsigned int flags;
108 };
110 enum {
111 SP_XML_SPACE_DEFAULT,
112 SP_XML_SPACE_PRESERVE
113 };
115 class SPIXmlSpace;
117 /// Internal class consisting of two bits.
118 struct SPIXmlSpace {
119 guint set : 1;
120 guint value : 1;
121 };
123 class SPObject;
125 /*
126 * Refcounting
127 *
128 * Owner is here for debug reasons, you can set it to NULL safely
129 * Ref should return object, NULL is error, unref return always NULL
130 */
132 SPObject *sp_object_ref(SPObject *object, SPObject *owner=NULL);
133 SPObject *sp_object_unref(SPObject *object, SPObject *owner=NULL);
135 SPObject *sp_object_href(SPObject *object, gpointer owner);
136 SPObject *sp_object_hunref(SPObject *object, gpointer owner);
138 /// A refcounting tree node object.
139 struct SPObject : public GObject {
140 enum CollectionPolicy {
141 COLLECT_WITH_PARENT,
142 ALWAYS_COLLECT
143 };
145 unsigned int cloned : 1;
146 unsigned int uflags : 8;
147 unsigned int mflags : 8;
148 SPIXmlSpace xml_space;
149 unsigned int hrefcount; /* number of xlink:href references */
150 unsigned int _total_hrefcount; /* our hrefcount + total descendants */
151 SPDocument *document; /* Document we are part of */
152 SPObject *parent; /* Our parent (only one allowed) */
153 SPObject *children; /* Our children */
154 SPObject *_last_child; /* Remembered last child */
155 SPObject *next; /* Next object in linked list */
156 Inkscape::XML::Node *repr; /* Our xml representation */
157 gchar *id; /* Our very own unique id */
159 /** @brief cleans up an SPObject, releasing its references and
160 * requesting that references to it be released
161 */
162 void releaseReferences();
164 /** @brief connects to the release request signal
165 *
166 * @param slot the slot to connect
167 *
168 * @returns the sigc::connection formed
169 */
170 sigc::connection connectRelease(sigc::slot<void, SPObject *> slot) {
171 return _release_signal.connect(slot);
172 }
174 /**
175 * Represents the style properties, whether from presentation attributes, the <tt>style</tt>
176 * attribute, or inherited.
177 *
178 * sp_object_private_set doesn't handle SP_ATTR_STYLE or any presentation attributes at the
179 * time of writing, so this is probably NULL for all SPObject's that aren't an SPItem.
180 *
181 * However, this gives rise to the bugs mentioned in sp_object_get_style_property.
182 * Note that some non-SPItem SPObject's, such as SPStop, do need styling information,
183 * and need to inherit properties even through other non-SPItem parents like \<defs\>.
184 */
185 SPStyle *style;
187 /// Switch containing next() method.
188 struct ParentIteratorStrategy {
189 static SPObject const *next(SPObject const *object) {
190 return object->parent;
191 }
192 };
193 /// Switch containing next() method.
194 struct SiblingIteratorStrategy {
195 static SPObject const *next(SPObject const *object) {
196 return object->next;
197 }
198 };
200 typedef Inkscape::Util::ForwardPointerIterator<SPObject, ParentIteratorStrategy> ParentIterator;
201 typedef Inkscape::Util::ForwardPointerIterator<SPObject const, ParentIteratorStrategy> ConstParentIterator;
202 typedef Inkscape::Util::ForwardPointerIterator<SPObject, SiblingIteratorStrategy> SiblingIterator;
203 typedef Inkscape::Util::ForwardPointerIterator<SPObject const, SiblingIteratorStrategy> ConstSiblingIterator;
205 bool isSiblingOf(SPObject const *object) const {
206 g_return_val_if_fail(object != NULL, false);
207 return this->parent && this->parent == object->parent;
208 }
209 bool isAncestorOf(SPObject const *object) const;
211 SPObject const *nearestCommonAncestor(SPObject const *object) const;
212 /* A non-const version can be similarly constructed if you want one.
213 * (Don't just cast away the constness, which would be ill-formed.) */
215 bool hasChildren() const { return ( children != NULL ); }
217 SPObject *firstChild() { return children; }
218 SPObject const *firstChild() const { return children; }
219 SPObject *lastChild() { return _last_child; }
220 SPObject const *lastChild() const { return _last_child; }
222 enum Action { ActionGeneral, ActionBBox, ActionUpdate, ActionShow };
223 /** @brief Retrieves children as a GSList */
224 GSList *childList(bool add_ref, Action action = ActionGeneral);
226 SPObject *appendChildRepr(Inkscape::XML::Node *repr);
228 /** @brief Gets the author-visible label for this object. */
229 gchar const *label() const;
230 /** @brief Returns a default label for this object. */
231 gchar const *defaultLabel() const;
232 /** @brief Sets the author-visible label for this object.
233 *
234 * Sets the author-visible label for the object.
235 *
236 * @param label the new label
237 */
238 void setLabel(gchar const *label);
240 /** Retrieves the title of this object */
241 gchar *title() const;
242 /** Sets the title of this object */
243 void setTitle(gchar const *title);
245 /** Retrieves the description of this object */
246 gchar *desc() const;
247 /** Sets the description of this object */
248 void setDesc(gchar const *desc);
250 /** @brief Set the policy under which this object will be
251 * orphan-collected.
252 *
253 * Orphan-collection is the process of deleting all objects which no longer have
254 * hyper-references pointing to them. The policy determines when this happens. Many objects
255 * should not be deleted simply because they are no longer referred to; other objects (like
256 * "intermediate" gradients) are more or less throw-away and should always be collected when no
257 * longer in use.
258 *
259 * Along these lines, there are currently two orphan-collection policies:
260 *
261 * COLLECT_WITH_PARENT - don't worry about the object's hrefcount;
262 * if its parent is collected, this object
263 * will be too
264 *
265 * COLLECT_ALWAYS - always collect the object as soon as its
266 * hrefcount reaches zero
267 *
268 * @returns the current collection policy in effect for this object
269 */
270 CollectionPolicy collectionPolicy() const { return _collection_policy; }
272 /** @brief Sets the orphan-collection policy in effect for this object.
273 *
274 * @see SPObject::collectionPolicy
275 *
276 * @param policy the new policy to adopt
277 */
278 void setCollectionPolicy(CollectionPolicy policy) {
279 _collection_policy = policy;
280 }
282 /** @brief Requests a later automatic call to collectOrphan().
283 *
284 * This method requests that collectOrphan() be called during the document update cycle,
285 * deleting the object if it is no longer used.
286 *
287 * If the current collection policy is COLLECT_WITH_PARENT, this function has no effect.
288 *
289 * @see SPObject::collectOrphan
290 */
291 void requestOrphanCollection();
293 /** @brief Unconditionally delete the object if it is not referenced.
294 *
295 * Unconditionally delete the object if there are no outstanding hyper-references to it.
296 * Observers are not notified of the object's deletion (at the SPObject level; XML tree
297 * notifications still fire).
298 *
299 * @see SPObject::deleteObject
300 */
301 void collectOrphan() {
302 if ( _total_hrefcount == 0 ) {
303 deleteObject(false);
304 }
305 }
307 /** @brief Check if object is referenced by any other object.
308 */
309 bool isReferenced() { return ( _total_hrefcount > 0 ); }
311 /** @brief Deletes an object.
312 *
313 * Detaches the object's repr, and optionally sends notification that the object has been
314 * deleted.
315 *
316 * @param propagate notify observers that the object has been deleted?
317 *
318 * @param propagate_descendants notify observers of children that they have been deleted?
319 */
320 void deleteObject(bool propagate, bool propagate_descendants);
322 /** @brief Deletes on object.
323 *
324 * @param propagate Notify observers of this object and its children that they have been
325 * deleted?
326 */
327 void deleteObject(bool propagate=true) {
328 deleteObject(propagate, propagate);
329 }
331 /** @brief Connects a slot to be called when an object is deleted.
332 *
333 * This connects a slot to an object's internal delete signal, which is invoked when the object
334 * is deleted
335 *
336 * The signal is mainly useful for e.g. knowing when to break hrefs or dissociate clones.
337 *
338 * @param slot the slot to connect
339 *
340 * @see SPObject::deleteObject
341 */
342 sigc::connection connectDelete(sigc::slot<void, SPObject *> slot) {
343 return _delete_signal.connect(slot);
344 }
346 sigc::connection connectPositionChanged(sigc::slot<void, SPObject *> slot) {
347 return _position_changed_signal.connect(slot);
348 }
350 /** @brief Returns the object which supercedes this one (if any).
351 *
352 * This is mainly useful for ensuring we can correctly perform a series of moves or deletes,
353 * even if the objects in question have been replaced in the middle of the sequence.
354 */
355 SPObject *successor() { return _successor; }
357 /** @brief Indicates that another object supercedes this one. */
358 void setSuccessor(SPObject *successor) {
359 g_assert(successor != NULL);
360 g_assert(_successor == NULL);
361 g_assert(successor->_successor == NULL);
362 sp_object_ref(successor, NULL);
363 _successor = successor;
364 }
366 /* modifications; all three sets of methods should probably ultimately be protected, as they
367 * are not really part of its public interface. However, other parts of the code to
368 * occasionally use them at present. */
370 /* the no-argument version of updateRepr() is intended to be a bit more public, however -- it
371 * essentially just flushes any changes back to the backing store (the repr layer); maybe it
372 * should be called something else and made public at that point. */
374 /** @brief Updates the object's repr based on the object's state.
375 *
376 * This method updates the the repr attached to the object to reflect the object's current
377 * state; see the two-argument version for details.
378 *
379 * @param flags object write flags that apply to this update
380 *
381 * @return the updated repr
382 */
383 Inkscape::XML::Node *updateRepr(unsigned int flags=SP_OBJECT_WRITE_EXT);
385 /** @brief Updates the given repr based on the object's state.
386 *
387 * This method updates the given repr to reflect the object's current state. There are
388 * several flags that affect this:
389 *
390 * SP_OBJECT_WRITE_BUILD - create new reprs
391 *
392 * SP_OBJECT_WRITE_EXT - write elements and attributes
393 * which are not part of pure SVG
394 * (i.e. the Inkscape and Sodipodi
395 * namespaces)
396 *
397 * SP_OBJECT_WRITE_ALL - create all nodes and attributes,
398 * even those which might be redundant
399 *
400 * @param repr the repr to update
401 * @param flags object write flags that apply to this update
402 *
403 * @return the updated repr
404 */
405 Inkscape::XML::Node *updateRepr(Inkscape::XML::Node *repr, unsigned int flags);
407 /** @brief Queues an deferred update of this object's display.
408 *
409 * This method sets flags to indicate updates to be performed later, during the idle loop.
410 *
411 * There are several flags permitted here:
412 *
413 * SP_OBJECT_MODIFIED_FLAG - the object has been modified
414 *
415 * SP_OBJECT_CHILD_MODIFIED_FLAG - a child of the object has been
416 * modified
417 *
418 * SP_OBJECT_STYLE_MODIFIED_FLAG - the object's style has been
419 * modified
420 *
421 * There are also some subclass-specific modified flags which are hardly ever used.
422 *
423 * One of either MODIFIED or CHILD_MODIFIED is required.
424 *
425 * @param flags flags indicating what to update
426 */
427 void requestDisplayUpdate(unsigned int flags);
429 /** @brief Updates the object's display immediately
430 *
431 * This method is called during the idle loop by SPDocument in order to update the object's
432 * display.
433 *
434 * One additional flag is legal here:
435 *
436 * SP_OBJECT_PARENT_MODIFIED_FLAG - the parent has been
437 * modified
438 *
439 * @param ctx an SPCtx which accumulates various state
440 * during the recursive update -- beware! some
441 * subclasses try to cast this to an SPItemCtx *
442 *
443 * @param flags flags indicating what to update (in addition
444 * to any already set flags)
445 */
446 void updateDisplay(SPCtx *ctx, unsigned int flags);
448 /** @brief Requests that a modification notification signal
449 * be emitted later (e.g. during the idle loop)
450 *
451 * @param flags flags indicating what has been modified
452 */
453 void requestModified(unsigned int flags);
455 /** @brief Emits a modification notification signal
456 *
457 * @param flags indicating what has been modified
458 */
459 void emitModified(unsigned int flags);
461 /** @brief Connects to the modification notification signal
462 *
463 * @param slot the slot to connect
464 *
465 * @returns the connection formed thereby
466 */
467 sigc::connection connectModified(
468 sigc::slot<void, SPObject *, unsigned int> slot
469 ) {
470 return _modified_signal.connect(slot);
471 }
473 void _sendDeleteSignalRecursive();
474 void _updateTotalHRefCount(int increment);
476 void _requireSVGVersion(unsigned major, unsigned minor) {
477 _requireSVGVersion(Inkscape::Version(major, minor));
478 }
479 void _requireSVGVersion(Inkscape::Version version);
481 sigc::signal<void, SPObject *> _release_signal;
482 sigc::signal<void, SPObject *> _delete_signal;
483 sigc::signal<void, SPObject *> _position_changed_signal;
484 sigc::signal<void, SPObject *, unsigned int> _modified_signal;
485 SPObject *_successor;
486 CollectionPolicy _collection_policy;
487 gchar *_label;
488 mutable gchar *_default_label;
490 private:
491 // Private member functions used in the definitions of setTitle(),
492 // setDesc(), title() and desc().
493 void setTitleOrDesc(gchar const *value, gchar const *svg_tagname);
494 gchar * getTitleOrDesc(gchar const *svg_tagname) const;
495 SPObject * findFirstChild(gchar const *tagname) const;
496 GString * textualContent() const;
497 };
499 /// The SPObject vtable.
500 struct SPObjectClass {
501 GObjectClass parent_class;
503 void (* build) (SPObject *object, SPDocument *doc, Inkscape::XML::Node *repr);
504 void (* release) (SPObject *object);
506 /* Virtual handlers of repr signals */
507 void (* child_added) (SPObject *object, Inkscape::XML::Node *child, Inkscape::XML::Node *ref);
508 void (* remove_child) (SPObject *object, Inkscape::XML::Node *child);
510 void (* order_changed) (SPObject *object, Inkscape::XML::Node *child, Inkscape::XML::Node *old, Inkscape::XML::Node *new_repr);
512 void (* set) (SPObject *object, unsigned int key, gchar const *value);
514 void (* read_content) (SPObject *object);
516 /* Update handler */
517 void (* update) (SPObject *object, SPCtx *ctx, unsigned int flags);
518 /* Modification handler */
519 void (* modified) (SPObject *object, unsigned int flags);
521 Inkscape::XML::Node * (* write) (SPObject *object, Inkscape::XML::Node *repr, unsigned int flags);
522 };
525 /*
526 * Attaching/detaching
527 */
529 void sp_object_attach(SPObject *parent, SPObject *object, SPObject *prev);
530 void sp_object_reorder(SPObject *object, SPObject *prev);
531 void sp_object_detach(SPObject *parent, SPObject *object);
533 inline SPObject *sp_object_first_child(SPObject *parent) {
534 return parent->firstChild();
535 }
536 SPObject *sp_object_get_child_by_repr(SPObject *object, Inkscape::XML::Node *repr);
538 void sp_object_invoke_build(SPObject *object, SPDocument *document, Inkscape::XML::Node *repr, unsigned int cloned);
540 void sp_object_set(SPObject *object, unsigned int key, gchar const *value);
542 void sp_object_read_attr(SPObject *object, gchar const *key);
544 /* Public */
546 gchar const *sp_object_tagName_get(SPObject const *object, SPException *ex);
547 gchar const *sp_object_getAttribute(SPObject const *object, gchar const *key, SPException *ex);
548 void sp_object_setAttribute(SPObject *object, gchar const *key, gchar const *value, SPException *ex);
549 void sp_object_removeAttribute(SPObject *object, gchar const *key, SPException *ex);
551 /* Style */
553 gchar const *sp_object_get_style_property(SPObject const *object,
554 gchar const *key, gchar const *def);
556 Inkscape::Version sp_object_get_sodipodi_version(SPObject *object);
558 int sp_object_compare_position(SPObject const *first, SPObject const *second);
560 SPObject *sp_object_prev(SPObject *child);
563 #endif // SP_OBJECT_H_SEEN
566 /*
567 Local Variables:
568 mode:c++
569 c-file-style:"stroustrup"
570 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
571 indent-tabs-mode:nil
572 fill-column:99
573 End:
574 */
575 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4:encoding=utf-8:textwidth=99 :