62259fa1947f7c63fcf63c1d5cd0aa67b55482b7
1 #define __SP_DOCUMENT_UNDO_C__
3 /** \file
4 * Undo/Redo stack implementation
5 *
6 * Authors:
7 * Lauris Kaplinski <lauris@kaplinski.com>
8 * MenTaLguY <mental@rydia.net>
9 *
10 * Copyright (C) 2007 MenTaLguY <mental@rydia.net>
11 * Copyright (C) 1999-2003 authors
12 * Copyright (C) 2001-2002 Ximian, Inc.
13 *
14 * Released under GNU GPL, read the file 'COPYING' for more information
15 *
16 * Using the split document model gives sodipodi a very simple and clean
17 * undo implementation. Whenever mutation occurs in the XML tree,
18 * SPObject invokes one of the five corresponding handlers of its
19 * container document. This writes down a generic description of the
20 * given action, and appends it to the recent action list, kept by the
21 * document. There will be as many action records as there are mutation
22 * events, which are all kept and processed together in the undo
23 * stack. Two methods exist to indicate that the given action is completed:
24 *
25 * \verbatim
26 void sp_document_done (SPDocument *document);
27 void sp_document_maybe_done (SPDocument *document, const unsigned char *key) \endverbatim
28 *
29 * Both move the recent action list into the undo stack and clear the
30 * list afterwards. While the first method does an unconditional push,
31 * the second one first checks the key of the most recent stack entry. If
32 * the keys are identical, the current action list is appended to the
33 * existing stack entry, instead of pushing it onto its own. This
34 * behaviour can be used to collect multi-step actions (like winding the
35 * Gtk spinbutton) from the UI into a single undoable step.
36 *
37 * For controls implemented by Sodipodi itself, implementing undo as a
38 * single step is usually done in a more efficent way. Most controls have
39 * the abstract model of grab, drag, release, and change user
40 * action. During the grab phase, all modifications are done to the
41 * SPObject directly - i.e. they do not change XML tree, and thus do not
42 * generate undo actions either. Only at the release phase (normally
43 * associated with releasing the mousebutton), changes are written back
44 * to the XML tree, thus generating only a single set of undo actions.
45 * (Lauris Kaplinski)
46 */
48 #ifdef HAVE_CONFIG_H
49 # include "config.h"
50 #endif
54 #if HAVE_STRING_H
55 #endif
58 #if HAVE_STDLIB_H
59 #endif
61 #include <string>
62 #include <cstring>
63 #include "xml/repr.h"
64 #include "document-private.h"
65 #include "inkscape.h"
66 #include "debug/event-tracker.h"
67 #include "debug/simple-event.h"
68 #include "debug/timestamp.h"
69 #include "event.h"
72 /*
73 * Undo & redo
74 */
75 /**
76 * Set undo sensitivity.
77 *
78 * \note
79 * Since undo sensitivity needs to be nested, setting undo sensitivity
80 * should be done like this:
81 *\verbatim
82 bool saved = sp_document_get_undo_sensitive(document);
83 sp_document_set_undo_sensitive(document, false);
84 ... do stuff ...
85 sp_document_set_undo_sensitive(document, saved); \endverbatim
86 */
87 void
88 sp_document_set_undo_sensitive (SPDocument *doc, bool sensitive)
89 {
90 g_assert (doc != NULL);
91 g_assert (doc->priv != NULL);
93 if ( sensitive == doc->priv->sensitive )
94 return;
96 if (sensitive) {
97 sp_repr_begin_transaction (doc->rdoc);
98 } else {
99 doc->priv->partial = sp_repr_coalesce_log (
100 doc->priv->partial,
101 sp_repr_commit_undoable (doc->rdoc)
102 );
103 }
105 doc->priv->sensitive = sensitive;
106 }
108 /*TODO: Throughout the inkscape code tree set/get_undo_sensitive are used for
109 * as is shown above. Perhaps it makes sense to create new functions,
110 * undo_ignore, and undo_recall to replace the start and end parts of the above.
111 * The main complexity with this is that they have to nest, so you have to store
112 * the saved bools in a stack. Perhaps this is why the above solution is better.
113 */
115 bool sp_document_get_undo_sensitive(SPDocument const *document) {
116 g_assert(document != NULL);
117 g_assert(document->priv != NULL);
119 return document->priv->sensitive;
120 }
122 void
123 sp_document_done (SPDocument *doc, const unsigned int event_type, Glib::ustring event_description)
124 {
125 sp_document_maybe_done (doc, NULL, event_type, event_description);
126 }
128 void
129 sp_document_reset_key (Inkscape::Application */*inkscape*/, SPDesktop */*desktop*/, GtkObject *base)
130 {
131 SPDocument *doc = (SPDocument *) base;
132 doc->actionkey = NULL;
133 }
135 namespace {
137 using Inkscape::Debug::Event;
138 using Inkscape::Debug::SimpleEvent;
139 using Inkscape::Util::share_static_string;
140 using Inkscape::Debug::timestamp;
141 using Inkscape::Verb;
143 typedef SimpleEvent<Event::INTERACTION> InteractionEvent;
145 class CommitEvent : public InteractionEvent {
146 public:
148 CommitEvent(SPDocument *doc, const gchar *key, const unsigned int type)
149 : InteractionEvent(share_static_string("commit"))
150 {
151 _addProperty(share_static_string("timestamp"), timestamp());
152 gchar *serial = g_strdup_printf("%lu", doc->serial());
153 _addProperty(share_static_string("document"), serial);
154 g_free(serial);
155 Verb *verb = Verb::get(type);
156 if (verb) {
157 _addProperty(share_static_string("context"), verb->get_id());
158 }
159 if (key) {
160 _addProperty(share_static_string("merge-key"), key);
161 }
162 }
163 };
165 }
167 void
168 sp_document_maybe_done (SPDocument *doc, const gchar *key, const unsigned int event_type,
169 Glib::ustring event_description)
170 {
171 g_assert (doc != NULL);
172 g_assert (doc->priv != NULL);
173 g_assert (doc->priv->sensitive);
175 Inkscape::Debug::EventTracker<CommitEvent> tracker(doc, key, event_type);
177 doc->collectOrphans();
179 sp_document_ensure_up_to_date (doc);
181 sp_document_clear_redo (doc);
183 Inkscape::XML::Event *log = sp_repr_coalesce_log (doc->priv->partial, sp_repr_commit_undoable (doc->rdoc));
184 doc->priv->partial = NULL;
186 if (!log) {
187 sp_repr_begin_transaction (doc->rdoc);
188 return;
189 }
191 if (key && doc->actionkey && !strcmp (key, doc->actionkey) && doc->priv->undo) {
192 ((Inkscape::Event *)doc->priv->undo->data)->event =
193 sp_repr_coalesce_log (((Inkscape::Event *)doc->priv->undo->data)->event, log);
194 } else {
195 Inkscape::Event *event = new Inkscape::Event(log, event_type, event_description);
196 doc->priv->undo = g_slist_prepend (doc->priv->undo, event);
197 doc->priv->history_size++;
198 doc->priv->undoStackObservers.notifyUndoCommitEvent(event);
199 }
201 if (doc->actionkey)
202 g_free(doc->actionkey);
203 doc->actionkey = key ? g_strdup(key) : NULL;
205 doc->virgin = FALSE;
206 doc->setModifiedSinceSave();
208 sp_repr_begin_transaction (doc->rdoc);
210 doc->priv->commit_signal.emit();
211 }
213 void
214 sp_document_cancel (SPDocument *doc)
215 {
216 g_assert (doc != NULL);
217 g_assert (doc->priv != NULL);
218 g_assert (doc->priv->sensitive);
220 sp_repr_rollback (doc->rdoc);
222 if (doc->priv->partial) {
223 sp_repr_undo_log (doc->priv->partial);
224 sp_repr_free_log (doc->priv->partial);
225 doc->priv->partial = NULL;
226 }
228 sp_repr_begin_transaction (doc->rdoc);
229 }
231 static void finish_incomplete_transaction(SPDocument &doc) {
232 SPDocumentPrivate &priv=*doc.priv;
233 Inkscape::XML::Event *log=sp_repr_commit_undoable(doc.rdoc);
234 if (log || priv.partial) {
235 g_warning ("Incomplete undo transaction:");
236 priv.partial = sp_repr_coalesce_log(priv.partial, log);
237 sp_repr_debug_print_log(priv.partial);
238 Inkscape::Event *event = new Inkscape::Event(priv.partial);
239 priv.undo = g_slist_prepend(priv.undo, event);
240 priv.undoStackObservers.notifyUndoCommitEvent(event);
241 priv.partial = NULL;
242 }
243 }
245 gboolean
246 sp_document_undo (SPDocument *doc)
247 {
248 using Inkscape::Debug::EventTracker;
249 using Inkscape::Debug::SimpleEvent;
251 gboolean ret;
253 EventTracker<SimpleEvent<Inkscape::Debug::Event::DOCUMENT> > tracker("undo");
255 g_assert (doc != NULL);
256 g_assert (doc->priv != NULL);
257 g_assert (doc->priv->sensitive);
259 doc->priv->sensitive = FALSE;
260 doc->priv->seeking = true;
262 doc->actionkey = NULL;
264 finish_incomplete_transaction(*doc);
266 if (doc->priv->undo) {
267 Inkscape::Event *log=(Inkscape::Event *)doc->priv->undo->data;
268 doc->priv->undo = g_slist_remove (doc->priv->undo, log);
269 sp_repr_undo_log (log->event);
270 doc->priv->redo = g_slist_prepend (doc->priv->redo, log);
272 doc->setModifiedSinceSave();
273 doc->priv->undoStackObservers.notifyUndoEvent(log);
275 ret = TRUE;
276 } else {
277 ret = FALSE;
278 }
280 sp_repr_begin_transaction (doc->rdoc);
282 doc->priv->sensitive = TRUE;
283 doc->priv->seeking = false;
285 if (ret)
286 inkscape_external_change();
288 return ret;
289 }
291 gboolean
292 sp_document_redo (SPDocument *doc)
293 {
294 using Inkscape::Debug::EventTracker;
295 using Inkscape::Debug::SimpleEvent;
297 gboolean ret;
299 EventTracker<SimpleEvent<Inkscape::Debug::Event::DOCUMENT> > tracker("redo");
301 g_assert (doc != NULL);
302 g_assert (doc->priv != NULL);
303 g_assert (doc->priv->sensitive);
305 doc->priv->sensitive = FALSE;
306 doc->priv->seeking = true;
308 doc->actionkey = NULL;
310 finish_incomplete_transaction(*doc);
312 if (doc->priv->redo) {
313 Inkscape::Event *log=(Inkscape::Event *)doc->priv->redo->data;
314 doc->priv->redo = g_slist_remove (doc->priv->redo, log);
315 sp_repr_replay_log (log->event);
316 doc->priv->undo = g_slist_prepend (doc->priv->undo, log);
318 doc->setModifiedSinceSave();
319 doc->priv->undoStackObservers.notifyRedoEvent(log);
321 ret = TRUE;
322 } else {
323 ret = FALSE;
324 }
326 sp_repr_begin_transaction (doc->rdoc);
328 doc->priv->sensitive = TRUE;
329 doc->priv->seeking = false;
331 if (ret)
332 inkscape_external_change();
334 return ret;
335 }
337 void
338 sp_document_clear_undo (SPDocument *doc)
339 {
340 if (doc->priv->undo)
341 doc->priv->undoStackObservers.notifyClearUndoEvent();
343 while (doc->priv->undo) {
344 GSList *current;
346 current = doc->priv->undo;
347 doc->priv->undo = current->next;
348 doc->priv->history_size--;
350 delete ((Inkscape::Event *) current->data);
351 g_slist_free_1 (current);
352 }
353 }
355 void
356 sp_document_clear_redo (SPDocument *doc)
357 {
358 if (doc->priv->redo)
359 doc->priv->undoStackObservers.notifyClearRedoEvent();
361 while (doc->priv->redo) {
362 GSList *current;
364 current = doc->priv->redo;
365 doc->priv->redo = current->next;
366 doc->priv->history_size--;
368 delete ((Inkscape::Event *) current->data);
369 g_slist_free_1 (current);
370 }
371 }
372 /*
373 Local Variables:
374 mode:c++
375 c-file-style:"stroustrup"
376 c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
377 indent-tabs-mode:nil
378 fill-column:99
379 End:
380 */
381 // vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 :