gio/gmenuexporter.c

   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, write to the Free Software
  16  *  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
  17  *  USA.
  18  *
  19  * Author: Ryan Lortie <desrt@desrt.ca>
  20  */
  21
  22 #include "config.h"
  23
  24 #include "gmenuexporter.h"
  25
  26 #include "gdbusmethodinvocation.h"
  27 #include "gdbusintrospection.h"
  28 #include "gdbusnamewatching.h"
  29 #include "gdbuserror.h"
  30
  31 /**
  32  * SECTION:gmenuexporter
  33  * @title: GMenuModel exporter
  34  * @short_description: Export GMenuModels on D-Bus
  35  * @see_also: #GMenuModel, #GDBusMenuModel
  36  *
  37  * These functions support exporting a #GMenuModel on D-Bus.
  38  * The D-Bus interface that is used is a private implementation
  39  * detail.
  40  *
  41  * To access an exported #GMenuModel remotely, use
  42  * g_dbus_menu_model_get() to obtain a #GDBusMenuModel.
  43  */
  44
  45 /* {{{1 D-Bus Interface description */
  46
  47 /* For documentation of this interface, see
  48  * http://live.gnome.org/GTK+/GApplication-dbus-apis
  49  */
  50
  51 static GDBusInterfaceInfo *
  52 org_gtk_Menus_get_interface (void)
  53 {
  54   static GDBusInterfaceInfo *interface_info;
  55
  56   if (interface_info == NULL)
  57     {
  58       GError *error = NULL;
  59       GDBusNodeInfo *info;
  60
  61       info = g_dbus_node_info_new_for_xml ("<node>"
  62                                            "  <interface name='org.gtk.Menus'>"
  63                                            "    <method name='Start'>"
  64                                            "      <arg type='au' name='groups' direction='in'/>"
  65                                            "      <arg type='a(uuaa{sv})' name='content' direction='out'/>"
  66                                            "    </method>"
  67                                            "    <method name='End'>"
  68                                            "      <arg type='au' name='groups' direction='in'/>"
  69                                            "    </method>"
  70                                            "    <signal name='Changed'>"
  71                                            "      arg type='a(uuuuaa{sv})' name='changes'/>"
  72                                            "    </signal>"
  73                                            "  </interface>"
  74                                            "</node>", &error);
  75       if (info == NULL)
  76         g_error ("%s\n", error->message);
  77       interface_info = g_dbus_node_info_lookup_interface (info, "org.gtk.Menus");
  78       g_assert (interface_info != NULL);
  79       g_dbus_interface_info_ref (interface_info);
  80       g_dbus_node_info_unref (info);
  81     }
  82
  83   return interface_info;
  84 }
  85
  86 /* {{{1 Forward declarations */
  87 typedef struct _GMenuExporterMenu                           GMenuExporterMenu;
  88 typedef struct _GMenuExporterLink                           GMenuExporterLink;
  89 typedef struct _GMenuExporterGroup                          GMenuExporterGroup;
  90 typedef struct _GMenuExporterRemote                         GMenuExporterRemote;
  91 typedef struct _GMenuExporterWatch                          GMenuExporterWatch;
  92 typedef struct _GMenuExporter                               GMenuExporter;
  93
  94 static gboolean                 g_menu_exporter_group_is_subscribed    (GMenuExporterGroup *group);
  95 static guint                    g_menu_exporter_group_get_id           (GMenuExporterGroup *group);
  96 static GMenuExporter *          g_menu_exporter_group_get_exporter     (GMenuExporterGroup *group);
  97 static GMenuExporterMenu *      g_menu_exporter_group_add_menu         (GMenuExporterGroup *group,
  98                                                                         GMenuModel         *model);
  99 static void                     g_menu_exporter_group_remove_menu      (GMenuExporterGroup *group,
 100                                                                         guint               id);
 101
 102 static GMenuExporterGroup *     g_menu_exporter_create_group           (GMenuExporter      *exporter);
 103 static GMenuExporterGroup *     g_menu_exporter_lookup_group           (GMenuExporter      *exporter,
 104                                                                         guint               group_id);
 105 static void                     g_menu_exporter_report                 (GMenuExporter      *exporter,
 106                                                                         GVariant           *report);
 107 static void                     g_menu_exporter_remove_group           (GMenuExporter      *exporter,
 108                                                                         guint               id);
 109
 110 /* {{{1 GMenuExporterLink, GMenuExporterMenu */
 111
 112 struct _GMenuExporterMenu
 113 {
 114   GMenuExporterGroup *group;
 115   guint               id;
 116
 117   GMenuModel *model;
 118   gulong      handler_id;
 119   GSequence  *item_links;
 120 };
 121
 122 struct _GMenuExporterLink
 123 {
 124   gchar             *name;
 125   GMenuExporterMenu *menu;
 126   GMenuExporterLink *next;
 127 };
 128
 129 static void
 130 g_menu_exporter_menu_free (GMenuExporterMenu *menu)
 131 {
 132   g_menu_exporter_group_remove_menu (menu->group, menu->id);
 133
 134   if (menu->handler_id != 0)
 135     g_signal_handler_disconnect (menu->model, menu->handler_id);
 136
 137   if (menu->item_links != NULL)
 138     g_sequence_free (menu->item_links);
 139
 140   g_object_unref (menu->model);
 141
 142   g_slice_free (GMenuExporterMenu, menu);
 143 }
 144
 145 static void
 146 g_menu_exporter_link_free (gpointer data)
 147 {
 148   GMenuExporterLink *link = data;
 149
 150   while (link != NULL)
 151     {
 152       GMenuExporterLink *tmp = link;
 153       link = tmp->next;
 154
 155       g_menu_exporter_menu_free (tmp->menu);
 156       g_free (tmp->name);
 157
 158       g_slice_free (GMenuExporterLink, tmp);
 159     }
 160 }
 161
 162 static GMenuExporterLink *
 163 g_menu_exporter_menu_create_links (GMenuExporterMenu *menu,
 164                                    gint               position)
 165 {
 166   GMenuExporterLink *list = NULL;
 167   GMenuLinkIter *iter;
 168   const char *name;
 169   GMenuModel *model;
 170
 171   iter = g_menu_model_iterate_item_links (menu->model, position);
 172
 173   while (g_menu_link_iter_get_next (iter, &name, &model))
 174     {
 175       GMenuExporterGroup *group;
 176       GMenuExporterLink *tmp;
 177
 178       /* keep sections in the same group, but create new groups
 179        * otherwise
 180        */
 181       if (!g_str_equal (name, "section"))
 182         group = g_menu_exporter_create_group (g_menu_exporter_group_get_exporter (menu->group));
 183       else
 184         group = menu->group;
 185
 186       tmp = g_slice_new (GMenuExporterLink);
 187       tmp->name = g_strconcat (":", name, NULL);
 188       tmp->menu = g_menu_exporter_group_add_menu (group, model);
 189       tmp->next = list;
 190       list = tmp;
 191
 192       g_object_unref (model);
 193     }
 194
 195   g_object_unref (iter);
 196
 197   return list;
 198 }
 199
 200 static GVariant *
 201 g_menu_exporter_menu_describe_item (GMenuExporterMenu *menu,
 202                                     gint               position)
 203 {
 204   GMenuAttributeIter *attr_iter;
 205   GVariantBuilder builder;
 206   GSequenceIter *iter;
 207   GMenuExporterLink *link;
 208   const char *name;
 209   GVariant *value;
 210
 211   g_variant_builder_init (&builder, G_VARIANT_TYPE_VARDICT);
 212
 213   attr_iter = g_menu_model_iterate_item_attributes (menu->model, position);
 214   while (g_menu_attribute_iter_get_next (attr_iter, &name, &value))
 215     {
 216       g_variant_builder_add (&builder, "{sv}", name, value);
 217       g_variant_unref (value);
 218     }
 219   g_object_unref (attr_iter);
 220
 221   iter = g_sequence_get_iter_at_pos (menu->item_links, position);
 222   for (link = g_sequence_get (iter); link; link = link->next)
 223     g_variant_builder_add (&builder, "{sv}", link->name,
 224                            g_variant_new ("(uu)", g_menu_exporter_group_get_id (link->menu->group), link->menu->id));
 225
 226   return g_variant_builder_end (&builder);
 227 }
 228
 229 static GVariant *
 230 g_menu_exporter_menu_list (GMenuExporterMenu *menu)
 231 {
 232   GVariantBuilder builder;
 233   gint i, n;
 234
 235   g_variant_builder_init (&builder, G_VARIANT_TYPE ("aa{sv}"));
 236
 237   n = g_sequence_get_length (menu->item_links);
 238   for (i = 0; i < n; i++)
 239     g_variant_builder_add_value (&builder, g_menu_exporter_menu_describe_item (menu, i));
 240
 241   return g_variant_builder_end (&builder);
 242 }
 243
 244 static void
 245 g_menu_exporter_menu_items_changed (GMenuModel *model,
 246                                     gint        position,
 247                                     gint        removed,
 248                                     gint        added,
 249                                     gpointer    user_data)
 250 {
 251   GMenuExporterMenu *menu = user_data;
 252   GSequenceIter *point;
 253   gint i;
 254
 255   g_assert (menu->model == model);
 256   g_assert (menu->item_links != NULL);
 257   g_assert (position + removed <= g_sequence_get_length (menu->item_links));
 258
 259   point = g_sequence_get_iter_at_pos (menu->item_links, position + removed);
 260   g_sequence_remove_range (g_sequence_get_iter_at_pos (menu->item_links, position), point);
 261
 262   for (i = position; i < position + added; i++)
 263     g_sequence_insert_before (point, g_menu_exporter_menu_create_links (menu, i));
 264
 265   if (g_menu_exporter_group_is_subscribed (menu->group))
 266     {
 267       GVariantBuilder builder;
 268
 269       g_variant_builder_init (&builder, G_VARIANT_TYPE ("(uuuuaa{sv})"));
 270       g_variant_builder_add (&builder, "u", g_menu_exporter_group_get_id (menu->group));
 271       g_variant_builder_add (&builder, "u", menu->id);
 272       g_variant_builder_add (&builder, "u", position);
 273       g_variant_builder_add (&builder, "u", removed);
 274
 275       g_variant_builder_open (&builder, G_VARIANT_TYPE ("aa{sv}"));
 276       for (i = position; i < position + added; i++)
 277         g_variant_builder_add_value (&builder, g_menu_exporter_menu_describe_item (menu, i));
 278       g_variant_builder_close (&builder);
 279
 280       g_menu_exporter_report (g_menu_exporter_group_get_exporter (menu->group), g_variant_builder_end (&builder));
 281     }
 282 }
 283
 284 static void
 285 g_menu_exporter_menu_prepare (GMenuExporterMenu *menu)
 286 {
 287   gint n_items;
 288
 289   g_assert (menu->item_links == NULL);
 290
 291   if (g_menu_model_is_mutable (menu->model))
 292     menu->handler_id = g_signal_connect (menu->model, "items-changed",
 293                                          G_CALLBACK (g_menu_exporter_menu_items_changed), menu);
 294
 295   menu->item_links = g_sequence_new (g_menu_exporter_link_free);
 296
 297   n_items = g_menu_model_get_n_items (menu->model);
 298   if (n_items)
 299     g_menu_exporter_menu_items_changed (menu->model, 0, 0, n_items, menu);
 300 }
 301
 302 static GMenuExporterMenu *
 303 g_menu_exporter_menu_new (GMenuExporterGroup *group,
 304                           guint               id,
 305                           GMenuModel         *model)
 306 {
 307   GMenuExporterMenu *menu;
 308
 309   menu = g_slice_new0 (GMenuExporterMenu);
 310   menu->group = group;
 311   menu->id = id;
 312   menu->model = g_object_ref (model);
 313
 314   return menu;
 315 }
 316
 317 /* {{{1 GMenuExporterGroup */
 318
 319 struct _GMenuExporterGroup
 320 {
 321   GMenuExporter *exporter;
 322   guint          id;
 323
 324   GHashTable *menus;
 325   guint       next_menu_id;
 326   gboolean    prepared;
 327
 328   gint subscribed;
 329 };
 330
 331 static void
 332 g_menu_exporter_group_check_if_useless (GMenuExporterGroup *group)
 333 {
 334   if (g_hash_table_size (group->menus) == 0 && group->subscribed == 0)
 335     {
 336       g_menu_exporter_remove_group (group->exporter, group->id);
 337
 338       g_hash_table_unref (group->menus);
 339
 340       g_slice_free (GMenuExporterGroup, group);
 341     }
 342 }
 343
 344 static void
 345 g_menu_exporter_group_subscribe (GMenuExporterGroup *group,
 346                                  GVariantBuilder    *builder)
 347 {
 348   GHashTableIter iter;
 349   gpointer key, val;
 350
 351   if (!group->prepared)
 352     {
 353       GMenuExporterMenu *menu;
 354
 355       /* set this first, so that any menus created during the
 356        * preparation of the first menu also end up in the prepared
 357        * state.
 358        * */
 359       group->prepared = TRUE;
 360
 361       menu = g_hash_table_lookup (group->menus, 0);
 362
 363       /* If the group was created by a subscription and does not yet
 364        * exist, it won't have a root menu...
 365        *
 366        * That menu will be prepared if it is ever added (due to
 367        * group->prepared == TRUE).
 368        */
 369       if (menu)
 370         g_menu_exporter_menu_prepare (menu);
 371     }
 372
 373   group->subscribed++;
 374
 375   g_hash_table_iter_init (&iter, group->menus);
 376   while (g_hash_table_iter_next (&iter, &key, &val))
 377     {
 378       guint id = GPOINTER_TO_INT (key);
 379       GMenuExporterMenu *menu = val;
 380
 381       if (g_sequence_get_length (menu->item_links))
 382         {
 383           g_variant_builder_open (builder, G_VARIANT_TYPE ("(uuaa{sv})"));
 384           g_variant_builder_add (builder, "u", group->id);
 385           g_variant_builder_add (builder, "u", id);
 386           g_variant_builder_add_value (builder, g_menu_exporter_menu_list (menu));
 387           g_variant_builder_close (builder);
 388         }
 389     }
 390 }
 391
 392 static void
 393 g_menu_exporter_group_unsubscribe (GMenuExporterGroup *group,
 394                                    gint                count)
 395 {
 396   g_assert (group->subscribed >= count);
 397
 398   group->subscribed -= count;
 399
 400   g_menu_exporter_group_check_if_useless (group);
 401 }
 402
 403 static GMenuExporter *
 404 g_menu_exporter_group_get_exporter (GMenuExporterGroup *group)
 405 {
 406   return group->exporter;
 407 }
 408
 409 static gboolean
 410 g_menu_exporter_group_is_subscribed (GMenuExporterGroup *group)
 411 {
 412   return group->subscribed > 0;
 413 }
 414
 415 static guint
 416 g_menu_exporter_group_get_id (GMenuExporterGroup *group)
 417 {
 418   return group->id;
 419 }
 420
 421 static void
 422 g_menu_exporter_group_remove_menu (GMenuExporterGroup *group,
 423                                    guint               id)
 424 {
 425   g_hash_table_remove (group->menus, GINT_TO_POINTER (id));
 426
 427   g_menu_exporter_group_check_if_useless (group);
 428 }
 429
 430 static GMenuExporterMenu *
 431 g_menu_exporter_group_add_menu (GMenuExporterGroup *group,
 432                                 GMenuModel         *model)
 433 {
 434   GMenuExporterMenu *menu;
 435   guint id;
 436
 437   id = group->next_menu_id++;
 438   menu = g_menu_exporter_menu_new (group, id, model);
 439   g_hash_table_insert (group->menus, GINT_TO_POINTER (id), menu);
 440
 441   if (group->prepared)
 442     g_menu_exporter_menu_prepare (menu);
 443
 444   return menu;
 445 }
 446
 447 static GMenuExporterGroup *
 448 g_menu_exporter_group_new (GMenuExporter *exporter,
 449                            guint          id)
 450 {
 451   GMenuExporterGroup *group;
 452
 453   group = g_slice_new0 (GMenuExporterGroup);
 454   group->menus = g_hash_table_new (NULL, NULL);
 455   group->exporter = exporter;
 456   group->id = id;
 457
 458   return group;
 459 }
 460
 461 /* {{{1 GMenuExporterRemote */
 462
 463 struct _GMenuExporterRemote
 464 {
 465   GMenuExporter *exporter;
 466   GHashTable    *watches;
 467   guint          watch_id;
 468 };
 469
 470 static void
 471 g_menu_exporter_remote_subscribe (GMenuExporterRemote *remote,
 472                                   guint                group_id,
 473                                   GVariantBuilder     *builder)
 474 {
 475   GMenuExporterGroup *group;
 476   guint count;
 477
 478   count = (gsize) g_hash_table_lookup (remote->watches, GINT_TO_POINTER (group_id));
 479   g_hash_table_insert (remote->watches, GINT_TO_POINTER (group_id), GINT_TO_POINTER (count + 1));
 480
 481   /* Group will be created (as empty/unsubscribed if it does not exist) */
 482   group = g_menu_exporter_lookup_group (remote->exporter, group_id);
 483   g_menu_exporter_group_subscribe (group, builder);
 484 }
 485
 486 static void
 487 g_menu_exporter_remote_unsubscribe (GMenuExporterRemote *remote,
 488                                     guint                group_id)
 489 {
 490   GMenuExporterGroup *group;
 491   guint count;
 492
 493   count = (gsize) g_hash_table_lookup (remote->watches, GINT_TO_POINTER (group_id));
 494
 495   if (count == 0)
 496     return;
 497
 498   if (count != 1)
 499     g_hash_table_insert (remote->watches, GINT_TO_POINTER (group_id), GINT_TO_POINTER (count - 1));
 500   else
 501     g_hash_table_remove (remote->watches, GINT_TO_POINTER (group_id));
 502
 503   group = g_menu_exporter_lookup_group (remote->exporter, group_id);
 504   g_menu_exporter_group_unsubscribe (group, 1);
 505 }
 506
 507 static gboolean
 508 g_menu_exporter_remote_has_subscriptions (GMenuExporterRemote *remote)
 509 {
 510   return g_hash_table_size (remote->watches) != 0;
 511 }
 512
 513 static void
 514 g_menu_exporter_remote_free (gpointer data)
 515 {
 516   GMenuExporterRemote *remote = data;
 517   GHashTableIter iter;
 518   gpointer key, val;
 519
 520   g_hash_table_iter_init (&iter, remote->watches);
 521   while (g_hash_table_iter_next (&iter, &key, &val))
 522     {
 523       GMenuExporterGroup *group;
 524
 525       group = g_menu_exporter_lookup_group (remote->exporter, GPOINTER_TO_INT (key));
 526       g_menu_exporter_group_unsubscribe (group, GPOINTER_TO_INT (val));
 527     }
 528
 529   g_bus_unwatch_name (remote->watch_id);
 530   g_hash_table_unref (remote->watches);
 531
 532   g_slice_free (GMenuExporterRemote, remote);
 533 }
 534
 535 static GMenuExporterRemote *
 536 g_menu_exporter_remote_new (GMenuExporter *exporter,
 537                             guint          watch_id)
 538 {
 539   GMenuExporterRemote *remote;
 540
 541   remote = g_slice_new0 (GMenuExporterRemote);
 542   remote->exporter = exporter;
 543   remote->watches = g_hash_table_new (NULL, NULL);
 544   remote->watch_id = watch_id;
 545
 546   return remote;
 547 }
 548
 549 /* {{{1 GMenuExporter */
 550
 551 struct _GMenuExporter
 552 {
 553   GDBusConnection *connection;
 554   gchar *object_path;
 555   guint registration_id;
 556   GHashTable *groups;
 557   guint next_group_id;
 558
 559   GMenuExporterMenu *root;
 560   GHashTable *remotes;
 561 };
 562
 563 static void
 564 g_menu_exporter_name_vanished (GDBusConnection *connection,
 565                                const gchar     *name,
 566                                gpointer         user_data)
 567 {
 568   GMenuExporter *exporter = user_data;
 569
 570   /* connection == NULL when we get called because the connection closed */
 571   g_assert (exporter->connection == connection || connection == NULL);
 572
 573   g_hash_table_remove (exporter->remotes, name);
 574 }
 575
 576 static GVariant *
 577 g_menu_exporter_subscribe (GMenuExporter *exporter,
 578                            const gchar   *sender,
 579                            GVariant      *group_ids)
 580 {
 581   GMenuExporterRemote *remote;
 582   GVariantBuilder builder;
 583   GVariantIter iter;
 584   guint32 id;
 585
 586   remote = g_hash_table_lookup (exporter->remotes, sender);
 587
 588   if (remote == NULL)
 589     {
 590       guint watch_id;
 591
 592       watch_id = g_bus_watch_name_on_connection (exporter->connection, sender, G_BUS_NAME_WATCHER_FLAGS_NONE,
 593                                                  NULL, g_menu_exporter_name_vanished, exporter, NULL);
 594       remote = g_menu_exporter_remote_new (exporter, watch_id);
 595       g_hash_table_insert (exporter->remotes, g_strdup (sender), remote);
 596     }
 597
 598   g_variant_builder_init (&builder, G_VARIANT_TYPE ("(a(uuaa{sv}))"));
 599
 600   g_variant_builder_open (&builder, G_VARIANT_TYPE ("a(uuaa{sv})"));
 601
 602   g_variant_iter_init (&iter, group_ids);
 603   while (g_variant_iter_next (&iter, "u", &id))
 604     g_menu_exporter_remote_subscribe (remote, id, &builder);
 605
 606   g_variant_builder_close (&builder);
 607
 608   return g_variant_builder_end (&builder);
 609 }
 610
 611 static void
 612 g_menu_exporter_unsubscribe (GMenuExporter *exporter,
 613                              const gchar   *sender,
 614                              GVariant      *group_ids)
 615 {
 616   GMenuExporterRemote *remote;
 617   GVariantIter iter;
 618   guint32 id;
 619
 620   remote = g_hash_table_lookup (exporter->remotes, sender);
 621
 622   if (remote == NULL)
 623     return;
 624
 625   g_variant_iter_init (&iter, group_ids);
 626   while (g_variant_iter_next (&iter, "u", &id))
 627     g_menu_exporter_remote_unsubscribe (remote, id);
 628
 629   if (!g_menu_exporter_remote_has_subscriptions (remote))
 630     g_hash_table_remove (exporter->remotes, sender);
 631 }
 632
 633 static void
 634 g_menu_exporter_report (GMenuExporter *exporter,
 635                         GVariant      *report)
 636 {
 637   GVariantBuilder builder;
 638
 639   g_variant_builder_init (&builder, G_VARIANT_TYPE_TUPLE);
 640   g_variant_builder_open (&builder, G_VARIANT_TYPE_ARRAY);
 641   g_variant_builder_add_value (&builder, report);
 642   g_variant_builder_close (&builder);
 643
 644   g_dbus_connection_emit_signal (exporter->connection,
 645                                  NULL,
 646                                  exporter->object_path,
 647                                  "org.gtk.Menus", "Changed",
 648                                  g_variant_builder_end (&builder),
 649                                  NULL);
 650 }
 651
 652 static void
 653 g_menu_exporter_remove_group (GMenuExporter *exporter,
 654                               guint          id)
 655 {
 656   g_hash_table_remove (exporter->groups, GINT_TO_POINTER (id));
 657 }
 658
 659 static GMenuExporterGroup *
 660 g_menu_exporter_lookup_group (GMenuExporter *exporter,
 661                               guint          group_id)
 662 {
 663   GMenuExporterGroup *group;
 664
 665   group = g_hash_table_lookup (exporter->groups, GINT_TO_POINTER (group_id));
 666
 667   if (group == NULL)
 668     {
 669       group = g_menu_exporter_group_new (exporter, group_id);
 670       g_hash_table_insert (exporter->groups, GINT_TO_POINTER (group_id), group);
 671     }
 672
 673   return group;
 674 }
 675
 676 static GMenuExporterGroup *
 677 g_menu_exporter_create_group (GMenuExporter *exporter)
 678 {
 679   GMenuExporterGroup *group;
 680   guint id;
 681
 682   id = exporter->next_group_id++;
 683   group = g_menu_exporter_group_new (exporter, id);
 684   g_hash_table_insert (exporter->groups, GINT_TO_POINTER (id), group);
 685
 686   return group;
 687 }
 688
 689 static void
 690 g_menu_exporter_free (gpointer user_data)
 691 {
 692   GMenuExporter *exporter = user_data;
 693
 694   g_menu_exporter_menu_free (exporter->root);
 695   g_hash_table_unref (exporter->remotes);
 696   g_hash_table_unref (exporter->groups);
 697   g_object_unref (exporter->connection);
 698   g_free (exporter->object_path);
 699
 700   g_slice_free (GMenuExporter, exporter);
 701 }
 702
 703 static void
 704 g_menu_exporter_method_call (GDBusConnection       *connection,
 705                              const gchar           *sender,
 706                              const gchar           *object_path,
 707                              const gchar           *interface_name,
 708                              const gchar           *method_name,
 709                              GVariant              *parameters,
 710                              GDBusMethodInvocation *invocation,
 711                              gpointer               user_data)
 712 {
 713   GMenuExporter *exporter = user_data;
 714   GVariant *group_ids;
 715
 716   group_ids = g_variant_get_child_value (parameters, 0);
 717
 718   if (g_str_equal (method_name, "Start"))
 719     g_dbus_method_invocation_return_value (invocation, g_menu_exporter_subscribe (exporter, sender, group_ids));
 720
 721   else if (g_str_equal (method_name, "End"))
 722     {
 723       g_menu_exporter_unsubscribe (exporter, sender, group_ids);
 724       g_dbus_method_invocation_return_value (invocation, NULL);
 725     }
 726
 727   else
 728     g_assert_not_reached ();
 729
 730   g_variant_unref (group_ids);
 731 }
 732
 733 /* {{{1 Public API */
 734
 735 /**
 736  * g_dbus_connection_export_menu_model:
 737  * @connection: a #GDBusConnection
 738  * @object_path: a D-Bus object path
 739  * @menu: a #GMenuModel
 740  * @error: return location for an error, or %NULL
 741  *
 742  * Exports @menu on @connection at @object_path.
 743  *
 744  * The implemented D-Bus API should be considered private.
 745  * It is subject to change in the future.
 746  *
 747  * An object path can only have one menu model exported on it. If this
 748  * constraint is violated, the export will fail and 0 will be
 749  * returned (with @error set accordingly).
 750  *
 751  * You can unexport the menu model using
 752  * g_dbus_connection_unexport_menu_model() with the return value of
 753  * this function.
 754  *
 755  * Returns: the ID of the export (never zero), or 0 in case of failure
 756  *
 757  * Since: 2.32
 758  */
 759 guint
 760 g_dbus_connection_export_menu_model (GDBusConnection  *connection,
 761                                      const gchar      *object_path,
 762                                      GMenuModel       *menu,
 763                                      GError          **error)
 764 {
 765   const GDBusInterfaceVTable vtable = {
 766     g_menu_exporter_method_call,
 767   };
 768   GMenuExporter *exporter;
 769   guint id;
 770
 771   exporter = g_slice_new0 (GMenuExporter);
 772
 773   id = g_dbus_connection_register_object (connection, object_path, org_gtk_Menus_get_interface (),
 774                                           &vtable, exporter, g_menu_exporter_free, error);
 775
 776   if (id == 0)
 777     {
 778       g_slice_free (GMenuExporter, exporter);
 779       return 0;
 780     }
 781
 782   exporter->connection = g_object_ref (connection);
 783   exporter->object_path = g_strdup (object_path);
 784   exporter->groups = g_hash_table_new (NULL, NULL);
 785   exporter->remotes = g_hash_table_new_full (g_str_hash, g_str_equal, g_free, g_menu_exporter_remote_free);
 786   exporter->root = g_menu_exporter_group_add_menu (g_menu_exporter_create_group (exporter), menu);
 787
 788   return id;
 789 }
 790
 791 /**
 792  * g_dbus_connection_unexport_menu_model:
 793  * @connection: a #GDBusConnection
 794  * @export_id: the ID from g_dbus_connection_export_menu_model()
 795  *
 796  * Reverses the effect of a previous call to
 797  * g_dbus_connection_export_menu_model().
 798  *
 799  * It is an error to call this function with an ID that wasn't returned
 800  * from g_dbus_connection_export_menu_model() or to call it with the
 801  * same ID more than once.
 802  *
 803  * Since: 2.32
 804  */
 805 void
 806 g_dbus_connection_unexport_menu_model (GDBusConnection *connection,
 807                                        guint            export_id)
 808 {
 809   g_dbus_connection_unregister_object (connection, export_id);
 810 }
 811
 812 /* {{{1 Epilogue */
 813 /* vim:set foldmethod=marker: */