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1 office 1 /*
2 * Copyright © 2011 Canonical Ltd.
3 *
4 * This library is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU Lesser General Public License as
6 * published by the Free Software Foundation; either version 2 of the
7 * licence, or (at your option) any later version.
8 *
9 * This library is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
16 *
17 * Author: Ryan Lortie <desrt@desrt.ca>
18 */
19  
20 #include "config.h"
21  
22 #include "gdbusmenumodel.h"
23  
24 #include "gmenumodel.h"
25  
26 /* Prelude {{{1 */
27  
28 /**
29 * SECTION:gdbusmenumodel
30 * @title: GDBusMenuModel
31 * @short_description: A D-Bus GMenuModel implementation
32 * @include: gio/gio.h
33 * @see_also: [GMenuModel Exporter][gio-GMenuModel-exporter]
34 *
35 * #GDBusMenuModel is an implementation of #GMenuModel that can be used
36 * as a proxy for a menu model that is exported over D-Bus with
37 * g_dbus_connection_export_menu_model().
38 */
39  
40 /**
41 * GDBusMenuModel:
42 *
43 * #GDBusMenuModel is an opaque data structure and can only be accessed
44 * using the following functions.
45 */
46  
47 /*
48 * There are 3 main (quasi-)classes involved here:
49 *
50 * - GDBusMenuPath
51 * - GDBusMenuGroup
52 * - GDBusMenuModel
53 *
54 * Each of these classes exists as a parameterised singleton keyed to a
55 * particular thing:
56 *
57 * - GDBusMenuPath represents a D-Bus object path on a particular
58 * unique bus name on a particular GDBusConnection and in a
59 * particular GMainContext.
60 *
61 * - GDBusMenuGroup represents a particular group on a particular
62 * GDBusMenuPath.
63 *
64 * - GDBusMenuModel represents a particular menu within a particular
65 * GDBusMenuGroup.
66 *
67 * There are also two (and a half) utility structs:
68 *
69 * - PathIdentifier and ConstPathIdentifier
70 * - GDBusMenuModelItem
71 *
72 * PathIdentifier is the 4-tuple of (GMainContext, GDBusConnection,
73 * unique name, object path) that uniquely identifies a particular
74 * GDBusMenuPath. It holds ownership on each of these things, so we
75 * have a ConstPathIdentifier variant that does not.
76 *
77 * We have a 3-level hierarchy of hashtables:
78 *
79 * - a global hashtable (g_dbus_menu_paths) maps from PathIdentifier
80 * to GDBusMenuPath
81 *
82 * - each GDBusMenuPath has a hashtable mapping from guint (group
83 * number) to GDBusMenuGroup
84 *
85 * - each GDBusMenuGroup has a hashtable mapping from guint (menu
86 * number) to GDBusMenuModel.
87 *
88 * In this way, each quintuplet of (connection, bus name, object path,
89 * group id, menu id) maps to a single GDBusMenuModel instance that can be
90 * located via 3 hashtable lookups.
91 *
92 * All of the 3 classes are refcounted (GDBusMenuPath and
93 * GDBusMenuGroup manually, and GDBusMenuModel by virtue of being a
94 * GObject). The hashtables do not hold references -- rather, when the
95 * last reference is dropped, the object is removed from the hashtable.
96 *
97 * The hard references go in the other direction: GDBusMenuModel is created
98 * as the user requests it and only exists as long as the user holds a
99 * reference on it. GDBusMenuModel holds a reference on the GDBusMenuGroup
100 * from which it came. GDBusMenuGroup holds a reference on
101 * GDBusMenuPath.
102 *
103 * In addition to refcounts, each object has an 'active' variable (ints
104 * for GDBusMenuPath and GDBusMenuGroup, boolean for GDBusMenuModel).
105 *
106 * - GDBusMenuModel is inactive when created and becomes active only when
107 * first queried for information. This prevents extra work from
108 * happening just by someone acquiring a GDBusMenuModel (and not
109 * actually trying to display it yet).
110 *
111 * - The active count on GDBusMenuGroup is equal to the number of
112 * GDBusMenuModel instances in that group that are active. When the
113 * active count transitions from 0 to 1, the group calls the 'Start'
114 * method on the service to begin monitoring that group. When it
115 * drops from 1 to 0, the group calls the 'End' method to stop
116 * monitoring.
117 *
118 * - The active count on GDBusMenuPath is equal to the number of
119 * GDBusMenuGroup instances on that path with a non-zero active
120 * count. When the active count transitions from 0 to 1, the path
121 * sets up a signal subscription to monitor any changes. The signal
122 * subscription is taken down when the active count transitions from
123 * 1 to 0.
124 *
125 * When active, GDBusMenuPath gets incoming signals when changes occur.
126 * If the change signal mentions a group for which we currently have an
127 * active GDBusMenuGroup, the change signal is passed along to that
128 * group. If the group is inactive, the change signal is ignored.
129 *
130 * Most of the "work" occurs in GDBusMenuGroup. In addition to the
131 * hashtable of GDBusMenuModel instances, it keeps a hashtable of the actual
132 * menu contents, each encoded as GSequence of GDBusMenuModelItem. It
133 * initially populates this table with the results of the "Start" method
134 * call and then updates it according to incoming change signals. If
135 * the change signal mentions a menu for which we current have an active
136 * GDBusMenuModel, the change signal is passed along to that model. If the
137 * model is inactive, the change signal is ignored.
138 *
139 * GDBusMenuModelItem is just a pair of hashtables, one for the attributes
140 * and one for the links of the item. Both map strings to GVariant
141 * instances. In the case of links, the GVariant has type '(uu)' and is
142 * turned into a GDBusMenuModel at the point that the user pulls it through
143 * the API.
144 *
145 * Following the "empty is the same as non-existent" rule, the hashtable
146 * of GSequence of GDBusMenuModelItem holds NULL for empty menus.
147 *
148 * GDBusMenuModel contains very little functionality of its own. It holds a
149 * (weak) reference to the GSequence of GDBusMenuModelItem contained in the
150 * GDBusMenuGroup. It uses this GSequence to implement the GMenuModel
151 * interface. It also emits the "items-changed" signal if it is active
152 * and it was told that the contents of the GSequence changed.
153 */
154  
155 typedef struct _GDBusMenuGroup GDBusMenuGroup;
156 typedef struct _GDBusMenuPath GDBusMenuPath;
157  
158 static void g_dbus_menu_group_changed (GDBusMenuGroup *group,
159 guint menu_id,
160 gint position,
161 gint removed,
162 GVariant *added);
163 static void g_dbus_menu_model_changed (GDBusMenuModel *proxy,
164 GSequence *items,
165 gint position,
166 gint removed,
167 gint added);
168 static GDBusMenuGroup * g_dbus_menu_group_get_from_path (GDBusMenuPath *path,
169 guint group_id);
170 static GDBusMenuModel * g_dbus_menu_model_get_from_group (GDBusMenuGroup *group,
171 guint menu_id);
172  
173 /* PathIdentifier {{{1 */
174 typedef struct
175 {
176 GMainContext *context;
177 GDBusConnection *connection;
178 gchar *bus_name;
179 gchar *object_path;
180 } PathIdentifier;
181  
182 typedef const struct
183 {
184 GMainContext *context;
185 GDBusConnection *connection;
186 const gchar *bus_name;
187 const gchar *object_path;
188 } ConstPathIdentifier;
189  
190 static guint
191 path_identifier_hash (gconstpointer data)
192 {
193 ConstPathIdentifier *id = data;
194  
195 return g_str_hash (id->object_path);
196 }
197  
198 static gboolean
199 path_identifier_equal (gconstpointer a,
200 gconstpointer b)
201 {
202 ConstPathIdentifier *id_a = a;
203 ConstPathIdentifier *id_b = b;
204  
205 return id_a->connection == id_b->connection &&
206 g_str_equal (id_a->bus_name, id_b->bus_name) &&
207 g_str_equal (id_a->object_path, id_b->object_path);
208 }
209  
210 static void
211 path_identifier_free (PathIdentifier *id)
212 {
213 g_main_context_unref (id->context);
214 g_object_unref (id->connection);
215 g_free (id->bus_name);
216 g_free (id->object_path);
217  
218 g_slice_free (PathIdentifier, id);
219 }
220  
221 static PathIdentifier *
222 path_identifier_new (ConstPathIdentifier *cid)
223 {
224 PathIdentifier *id;
225  
226 id = g_slice_new (PathIdentifier);
227 id->context = g_main_context_ref (cid->context);
228 id->connection = g_object_ref (cid->connection);
229 id->bus_name = g_strdup (cid->bus_name);
230 id->object_path = g_strdup (cid->object_path);
231  
232 return id;
233 }
234  
235 /* GDBusMenuPath {{{1 */
236  
237 struct _GDBusMenuPath
238 {
239 PathIdentifier *id;
240 gint ref_count;
241  
242 GHashTable *groups;
243 gint active;
244 guint watch_id;
245 };
246  
247 static GHashTable *g_dbus_menu_paths;
248  
249 static GDBusMenuPath *
250 g_dbus_menu_path_ref (GDBusMenuPath *path)
251 {
252 path->ref_count++;
253  
254 return path;
255 }
256  
257 static void
258 g_dbus_menu_path_unref (GDBusMenuPath *path)
259 {
260 if (--path->ref_count == 0)
261 {
262 g_hash_table_remove (g_dbus_menu_paths, path->id);
263 g_hash_table_unref (path->groups);
264 path_identifier_free (path->id);
265  
266 g_slice_free (GDBusMenuPath, path);
267 }
268 }
269  
270 static void
271 g_dbus_menu_path_signal (GDBusConnection *connection,
272 const gchar *sender_name,
273 const gchar *object_path,
274 const gchar *interface_name,
275 const gchar *signal_name,
276 GVariant *parameters,
277 gpointer user_data)
278 {
279 GDBusMenuPath *path = user_data;
280 GVariantIter *iter;
281 guint group_id;
282 guint menu_id;
283 guint position;
284 guint removes;
285 GVariant *adds;
286  
287 if (!g_variant_is_of_type (parameters, G_VARIANT_TYPE ("(a(uuuuaa{sv}))")))
288 return;
289  
290 g_variant_get (parameters, "(a(uuuuaa{sv}))", &iter);
291 while (g_variant_iter_loop (iter, "(uuuu@aa{sv})", &group_id, &menu_id, &position, &removes, &adds))
292 {
293 GDBusMenuGroup *group;
294  
295 group = g_hash_table_lookup (path->groups, GINT_TO_POINTER (group_id));
296  
297 if (group != NULL)
298 g_dbus_menu_group_changed (group, menu_id, position, removes, adds);
299 }
300 g_variant_iter_free (iter);
301 }
302  
303 static void
304 g_dbus_menu_path_activate (GDBusMenuPath *path)
305 {
306 if (path->active++ == 0)
307 path->watch_id = g_dbus_connection_signal_subscribe (path->id->connection, path->id->bus_name,
308 "org.gtk.Menus", "Changed", path->id->object_path,
309 NULL, G_DBUS_SIGNAL_FLAGS_NONE,
310 g_dbus_menu_path_signal, path, NULL);
311 }
312  
313 static void
314 g_dbus_menu_path_deactivate (GDBusMenuPath *path)
315 {
316 if (--path->active == 0)
317 g_dbus_connection_signal_unsubscribe (path->id->connection, path->watch_id);
318 }
319  
320 static GDBusMenuPath *
321 g_dbus_menu_path_get (GMainContext *context,
322 GDBusConnection *connection,
323 const gchar *bus_name,
324 const gchar *object_path)
325 {
326 ConstPathIdentifier cid = { context, connection, bus_name, object_path };
327 GDBusMenuPath *path;
328  
329 if (g_dbus_menu_paths == NULL)
330 g_dbus_menu_paths = g_hash_table_new (path_identifier_hash, path_identifier_equal);
331  
332 path = g_hash_table_lookup (g_dbus_menu_paths, &cid);
333  
334 if (path == NULL)
335 {
336 path = g_slice_new (GDBusMenuPath);
337 path->id = path_identifier_new (&cid);
338 path->groups = g_hash_table_new (NULL, NULL);
339 path->ref_count = 0;
340 path->active = 0;
341  
342 g_hash_table_insert (g_dbus_menu_paths, path->id, path);
343 }
344  
345 return g_dbus_menu_path_ref (path);
346 }
347  
348 /* GDBusMenuGroup, GDBusMenuModelItem {{{1 */
349 typedef enum
350 {
351 GROUP_OFFLINE,
352 GROUP_PENDING,
353 GROUP_ONLINE
354 } GroupStatus;
355  
356 struct _GDBusMenuGroup
357 {
358 GDBusMenuPath *path;
359 guint id;
360  
361 GHashTable *proxies; /* uint -> unowned GDBusMenuModel */
362 GHashTable *menus; /* uint -> owned GSequence */
363 gint ref_count;
364 GroupStatus state;
365 gint active;
366 };
367  
368 typedef struct
369 {
370 GHashTable *attributes;
371 GHashTable *links;
372 } GDBusMenuModelItem;
373  
374 static GDBusMenuGroup *
375 g_dbus_menu_group_ref (GDBusMenuGroup *group)
376 {
377 group->ref_count++;
378  
379 return group;
380 }
381  
382 static void
383 g_dbus_menu_group_unref (GDBusMenuGroup *group)
384 {
385 if (--group->ref_count == 0)
386 {
387 g_assert (group->state == GROUP_OFFLINE);
388 g_assert (group->active == 0);
389  
390 g_hash_table_remove (group->path->groups, GINT_TO_POINTER (group->id));
391 g_hash_table_unref (group->proxies);
392 g_hash_table_unref (group->menus);
393  
394 g_dbus_menu_path_unref (group->path);
395  
396 g_slice_free (GDBusMenuGroup, group);
397 }
398 }
399  
400 static void
401 g_dbus_menu_model_item_free (gpointer data)
402 {
403 GDBusMenuModelItem *item = data;
404  
405 g_hash_table_unref (item->attributes);
406 g_hash_table_unref (item->links);
407  
408 g_slice_free (GDBusMenuModelItem, item);
409 }
410  
411 static GDBusMenuModelItem *
412 g_dbus_menu_group_create_item (GVariant *description)
413 {
414 GDBusMenuModelItem *item;
415 GVariantIter iter;
416 const gchar *key;
417 GVariant *value;
418  
419 item = g_slice_new (GDBusMenuModelItem);
420 item->attributes = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, (GDestroyNotify) g_variant_unref);
421 item->links = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, (GDestroyNotify) g_variant_unref);
422  
423 g_variant_iter_init (&iter, description);
424 while (g_variant_iter_loop (&iter, "{&sv}", &key, &value))
425 if (key[0] == ':')
426 /* key + 1 to skip the ':' */
427 g_hash_table_insert (item->links, g_strdup (key + 1), g_variant_ref (value));
428 else
429 g_hash_table_insert (item->attributes, g_strdup (key), g_variant_ref (value));
430  
431 return item;
432 }
433  
434 /*
435 * GDBusMenuGroup can be in three states:
436 *
437 * OFFLINE: not subscribed to this group
438 * PENDING: we made the call to subscribe to this group, but the result
439 * has not come back yet
440 * ONLINE: we are fully subscribed
441 *
442 * We can get into some nasty situations where we make a call due to an
443 * activation request but receive a deactivation request before the call
444 * returns. If another activation request occurs then we could risk
445 * sending a Start request even though one is already in progress. For
446 * this reason, we have to carefully consider what to do in each of the
447 * three states for each of the following situations:
448 *
449 * - activation requested
450 * - deactivation requested
451 * - Start call finishes
452 *
453 * To simplify things a bit, we do not have a callback for the Stop
454 * call. We just send it and assume that it takes effect immediately.
455 *
456 * Activation requested:
457 * OFFLINE: make the Start call and transition to PENDING
458 * PENDING: do nothing -- call is already in progress.
459 * ONLINE: this should not be possible
460 *
461 * Deactivation requested:
462 * OFFLINE: this should not be possible
463 * PENDING: do nothing -- handle it when the Start call finishes
464 * ONLINE: send the Stop call and move to OFFLINE immediately
465 *
466 * Start call finishes:
467 * OFFLINE: this should not be possible
468 * PENDING:
469 * If we should be active (ie: active count > 0): move to ONLINE
470 * If not: send Stop call and move to OFFLINE immediately
471 * ONLINE: this should not be possible
472 *
473 * We have to take care with regards to signal subscriptions (ie:
474 * activation of the GDBusMenuPath). The signal subscription is always
475 * established when transitioning from OFFLINE to PENDING and taken down
476 * when transitioning to OFFLINE (from either PENDING or ONLINE).
477 *
478 * Since there are two places where we transition to OFFLINE, we split
479 * that code out into a separate function.
480 */
481 static void
482 g_dbus_menu_group_go_offline (GDBusMenuGroup *group)
483 {
484 g_dbus_menu_path_deactivate (group->path);
485 g_dbus_connection_call (group->path->id->connection,
486 group->path->id->bus_name,
487 group->path->id->object_path,
488 "org.gtk.Menus", "End",
489 g_variant_new_parsed ("([ %u ],)", group->id),
490 NULL, G_DBUS_CALL_FLAGS_NONE, -1,
491 NULL, NULL, NULL);
492 group->state = GROUP_OFFLINE;
493 }
494  
495  
496 static void
497 g_dbus_menu_group_start_ready (GObject *source_object,
498 GAsyncResult *result,
499 gpointer user_data)
500 {
501 GDBusConnection *connection = G_DBUS_CONNECTION (source_object);
502 GDBusMenuGroup *group = user_data;
503 GVariant *reply;
504  
505 g_assert (group->state == GROUP_PENDING);
506  
507 reply = g_dbus_connection_call_finish (connection, result, NULL);
508  
509 if (group->active)
510 {
511 group->state = GROUP_ONLINE;
512  
513 /* If we receive no reply, just act like we got an empty reply. */
514 if (reply)
515 {
516 GVariantIter *iter;
517 GVariant *items;
518 guint group_id;
519 guint menu_id;
520  
521 g_variant_get (reply, "(a(uuaa{sv}))", &iter);
522 while (g_variant_iter_loop (iter, "(uu@aa{sv})", &group_id, &menu_id, &items))
523 if (group_id == group->id)
524 g_dbus_menu_group_changed (group, menu_id, 0, 0, items);
525 g_variant_iter_free (iter);
526 }
527 }
528 else
529 g_dbus_menu_group_go_offline (group);
530  
531 if (reply)
532 g_variant_unref (reply);
533  
534 g_dbus_menu_group_unref (group);
535 }
536  
537 static void
538 g_dbus_menu_group_activate (GDBusMenuGroup *group)
539 {
540 if (group->active++ == 0)
541 {
542 g_assert (group->state != GROUP_ONLINE);
543  
544 if (group->state == GROUP_OFFLINE)
545 {
546 g_dbus_menu_path_activate (group->path);
547  
548 g_dbus_connection_call (group->path->id->connection,
549 group->path->id->bus_name,
550 group->path->id->object_path,
551 "org.gtk.Menus", "Start",
552 g_variant_new_parsed ("([ %u ],)", group->id),
553 G_VARIANT_TYPE ("(a(uuaa{sv}))"),
554 G_DBUS_CALL_FLAGS_NONE, -1, NULL,
555 g_dbus_menu_group_start_ready,
556 g_dbus_menu_group_ref (group));
557 group->state = GROUP_PENDING;
558 }
559 }
560 }
561  
562 static void
563 g_dbus_menu_group_deactivate (GDBusMenuGroup *group)
564 {
565 if (--group->active == 0)
566 {
567 g_assert (group->state != GROUP_OFFLINE);
568  
569 if (group->state == GROUP_ONLINE)
570 {
571 /* We are here because nobody is watching, so just free
572 * everything and don't bother with the notifications.
573 */
574 g_hash_table_remove_all (group->menus);
575  
576 g_dbus_menu_group_go_offline (group);
577 }
578 }
579 }
580  
581 static void
582 g_dbus_menu_group_changed (GDBusMenuGroup *group,
583 guint menu_id,
584 gint position,
585 gint removed,
586 GVariant *added)
587 {
588 GSequenceIter *point;
589 GVariantIter iter;
590 GDBusMenuModel *proxy;
591 GSequence *items;
592 GVariant *item;
593 gint n_added;
594  
595 /* We could have signals coming to us when we're not active (due to
596 * some other process having subscribed to this group) or when we're
597 * pending. In both of those cases, we want to ignore the signal
598 * since we'll get our own information when we call "Start" for
599 * ourselves.
600 */
601 if (group->state != GROUP_ONLINE)
602 return;
603  
604 items = g_hash_table_lookup (group->menus, GINT_TO_POINTER (menu_id));
605  
606 if (items == NULL)
607 {
608 items = g_sequence_new (g_dbus_menu_model_item_free);
609 g_hash_table_insert (group->menus, GINT_TO_POINTER (menu_id), items);
610 }
611  
612 point = g_sequence_get_iter_at_pos (items, position + removed);
613  
614 g_return_if_fail (point != NULL);
615  
616 if (removed)
617 {
618 GSequenceIter *start;
619  
620 start = g_sequence_get_iter_at_pos (items, position);
621 g_sequence_remove_range (start, point);
622 }
623  
624 n_added = g_variant_iter_init (&iter, added);
625 while (g_variant_iter_loop (&iter, "@a{sv}", &item))
626 g_sequence_insert_before (point, g_dbus_menu_group_create_item (item));
627  
628 if (g_sequence_is_empty (items))
629 {
630 g_hash_table_remove (group->menus, GINT_TO_POINTER (menu_id));
631 items = NULL;
632 }
633  
634 if ((proxy = g_hash_table_lookup (group->proxies, GINT_TO_POINTER (menu_id))))
635 g_dbus_menu_model_changed (proxy, items, position, removed, n_added);
636 }
637  
638 static GDBusMenuGroup *
639 g_dbus_menu_group_get_from_path (GDBusMenuPath *path,
640 guint group_id)
641 {
642 GDBusMenuGroup *group;
643  
644 group = g_hash_table_lookup (path->groups, GINT_TO_POINTER (group_id));
645  
646 if (group == NULL)
647 {
648 group = g_slice_new (GDBusMenuGroup);
649 group->path = g_dbus_menu_path_ref (path);
650 group->id = group_id;
651 group->proxies = g_hash_table_new (NULL, NULL);
652 group->menus = g_hash_table_new_full (NULL, NULL, NULL, (GDestroyNotify) g_sequence_free);
653 group->state = GROUP_OFFLINE;
654 group->active = 0;
655 group->ref_count = 0;
656  
657 g_hash_table_insert (path->groups, GINT_TO_POINTER (group->id), group);
658 }
659  
660 return g_dbus_menu_group_ref (group);
661 }
662  
663 static GDBusMenuGroup *
664 g_dbus_menu_group_get (GMainContext *context,
665 GDBusConnection *connection,
666 const gchar *bus_name,
667 const gchar *object_path,
668 guint group_id)
669 {
670 GDBusMenuGroup *group;
671 GDBusMenuPath *path;
672  
673 path = g_dbus_menu_path_get (context, connection, bus_name, object_path);
674 group = g_dbus_menu_group_get_from_path (path, group_id);
675 g_dbus_menu_path_unref (path);
676  
677 return group;
678 }
679  
680 /* GDBusMenuModel {{{1 */
681  
682 typedef GMenuModelClass GDBusMenuModelClass;
683 struct _GDBusMenuModel
684 {
685 GMenuModel parent;
686  
687 GDBusMenuGroup *group;
688 guint id;
689  
690 GSequence *items; /* unowned */
691 gboolean active;
692 };
693  
694 G_DEFINE_TYPE (GDBusMenuModel, g_dbus_menu_model, G_TYPE_MENU_MODEL)
695  
696 static gboolean
697 g_dbus_menu_model_is_mutable (GMenuModel *model)
698 {
699 return TRUE;
700 }
701  
702 static gint
703 g_dbus_menu_model_get_n_items (GMenuModel *model)
704 {
705 GDBusMenuModel *proxy = G_DBUS_MENU_MODEL (model);
706  
707 if (!proxy->active)
708 {
709 g_dbus_menu_group_activate (proxy->group);
710 proxy->active = TRUE;
711 }
712  
713 return proxy->items ? g_sequence_get_length (proxy->items) : 0;
714 }
715  
716 static void
717 g_dbus_menu_model_get_item_attributes (GMenuModel *model,
718 gint item_index,
719 GHashTable **table)
720 {
721 GDBusMenuModel *proxy = G_DBUS_MENU_MODEL (model);
722 GDBusMenuModelItem *item;
723 GSequenceIter *iter;
724  
725 g_return_if_fail (proxy->active);
726 g_return_if_fail (proxy->items);
727  
728 iter = g_sequence_get_iter_at_pos (proxy->items, item_index);
729 g_return_if_fail (iter);
730  
731 item = g_sequence_get (iter);
732 g_return_if_fail (item);
733  
734 *table = g_hash_table_ref (item->attributes);
735 }
736  
737 static void
738 g_dbus_menu_model_get_item_links (GMenuModel *model,
739 gint item_index,
740 GHashTable **table)
741 {
742 GDBusMenuModel *proxy = G_DBUS_MENU_MODEL (model);
743 GDBusMenuModelItem *item;
744 GSequenceIter *iter;
745  
746 g_return_if_fail (proxy->active);
747 g_return_if_fail (proxy->items);
748  
749 iter = g_sequence_get_iter_at_pos (proxy->items, item_index);
750 g_return_if_fail (iter);
751  
752 item = g_sequence_get (iter);
753 g_return_if_fail (item);
754  
755 *table = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, g_object_unref);
756  
757 {
758 GHashTableIter tmp;
759 gpointer key;
760 gpointer value;
761  
762 g_hash_table_iter_init (&tmp, item->links);
763 while (g_hash_table_iter_next (&tmp, &key, &value))
764 {
765 if (g_variant_is_of_type (value, G_VARIANT_TYPE ("(uu)")))
766 {
767 guint group_id, menu_id;
768 GDBusMenuGroup *group;
769 GDBusMenuModel *link;
770  
771 g_variant_get (value, "(uu)", &group_id, &menu_id);
772  
773 /* save the hash lookup in a relatively common case */
774 if (proxy->group->id != group_id)
775 group = g_dbus_menu_group_get_from_path (proxy->group->path, group_id);
776 else
777 group = g_dbus_menu_group_ref (proxy->group);
778  
779 link = g_dbus_menu_model_get_from_group (group, menu_id);
780  
781 g_hash_table_insert (*table, g_strdup (key), link);
782  
783 g_dbus_menu_group_unref (group);
784 }
785 }
786 }
787 }
788  
789 static void
790 g_dbus_menu_model_finalize (GObject *object)
791 {
792 GDBusMenuModel *proxy = G_DBUS_MENU_MODEL (object);
793  
794 if (proxy->active)
795 g_dbus_menu_group_deactivate (proxy->group);
796  
797 g_hash_table_remove (proxy->group->proxies, GINT_TO_POINTER (proxy->id));
798 g_dbus_menu_group_unref (proxy->group);
799  
800 G_OBJECT_CLASS (g_dbus_menu_model_parent_class)
801 ->finalize (object);
802 }
803  
804 static void
805 g_dbus_menu_model_init (GDBusMenuModel *proxy)
806 {
807 }
808  
809 static void
810 g_dbus_menu_model_class_init (GDBusMenuModelClass *class)
811 {
812 GObjectClass *object_class = G_OBJECT_CLASS (class);
813  
814 class->is_mutable = g_dbus_menu_model_is_mutable;
815 class->get_n_items = g_dbus_menu_model_get_n_items;
816 class->get_item_attributes = g_dbus_menu_model_get_item_attributes;
817 class->get_item_links = g_dbus_menu_model_get_item_links;
818  
819 object_class->finalize = g_dbus_menu_model_finalize;
820 }
821  
822 static void
823 g_dbus_menu_model_changed (GDBusMenuModel *proxy,
824 GSequence *items,
825 gint position,
826 gint removed,
827 gint added)
828 {
829 proxy->items = items;
830  
831 if (proxy->active && (removed || added))
832 g_menu_model_items_changed (G_MENU_MODEL (proxy), position, removed, added);
833 }
834  
835 static GDBusMenuModel *
836 g_dbus_menu_model_get_from_group (GDBusMenuGroup *group,
837 guint menu_id)
838 {
839 GDBusMenuModel *proxy;
840  
841 proxy = g_hash_table_lookup (group->proxies, GINT_TO_POINTER (menu_id));
842 if (proxy)
843 g_object_ref (proxy);
844  
845 if (proxy == NULL)
846 {
847 proxy = g_object_new (G_TYPE_DBUS_MENU_MODEL, NULL);
848 proxy->items = g_hash_table_lookup (group->menus, GINT_TO_POINTER (menu_id));
849 g_hash_table_insert (group->proxies, GINT_TO_POINTER (menu_id), proxy);
850 proxy->group = g_dbus_menu_group_ref (group);
851 proxy->id = menu_id;
852 }
853  
854 return proxy;
855 }
856  
857 /**
858 * g_dbus_menu_model_get:
859 * @connection: a #GDBusConnection
860 * @bus_name: the bus name which exports the menu model
861 * @object_path: the object path at which the menu model is exported
862 *
863 * Obtains a #GDBusMenuModel for the menu model which is exported
864 * at the given @bus_name and @object_path.
865 *
866 * The thread default main context is taken at the time of this call.
867 * All signals on the menu model (and any linked models) are reported
868 * with respect to this context. All calls on the returned menu model
869 * (and linked models) must also originate from this same context, with
870 * the thread default main context unchanged.
871 *
872 * Returns: (transfer full): a #GDBusMenuModel object. Free with
873 * g_object_unref().
874 *
875 * Since: 2.32
876 */
877 GDBusMenuModel *
878 g_dbus_menu_model_get (GDBusConnection *connection,
879 const gchar *bus_name,
880 const gchar *object_path)
881 {
882 GDBusMenuGroup *group;
883 GDBusMenuModel *proxy;
884 GMainContext *context;
885  
886 context = g_main_context_get_thread_default ();
887 if (context == NULL)
888 context = g_main_context_default ();
889  
890 group = g_dbus_menu_group_get (context, connection, bus_name, object_path, 0);
891 proxy = g_dbus_menu_model_get_from_group (group, 0);
892 g_dbus_menu_group_unref (group);
893  
894 return proxy;
895 }
896  
897 #if 0
898 static void
899 dump_proxy (gpointer key, gpointer value, gpointer data)
900 {
901 GDBusMenuModel *proxy = value;
902  
903 g_print (" menu %d refcount %d active %d\n",
904 proxy->id, G_OBJECT (proxy)->ref_count, proxy->active);
905 }
906  
907 static void
908 dump_group (gpointer key, gpointer value, gpointer data)
909 {
910 GDBusMenuGroup *group = value;
911  
912 g_print (" group %d refcount %d state %d active %d\n",
913 group->id, group->ref_count, group->state, group->active);
914  
915 g_hash_table_foreach (group->proxies, dump_proxy, NULL);
916 }
917  
918 static void
919 dump_path (gpointer key, gpointer value, gpointer data)
920 {
921 PathIdentifier *pid = key;
922 GDBusMenuPath *path = value;
923  
924 g_print ("%s active %d\n", pid->object_path, path->active);
925 g_hash_table_foreach (path->groups, dump_group, NULL);
926 }
927  
928 void
929 g_dbus_menu_model_dump (void)
930 {
931 g_hash_table_foreach (g_dbus_menu_paths, dump_path, NULL);
932 }
933  
934 #endif
935  
936 /* Epilogue {{{1 */
937 /* vim:set foldmethod=marker: */