Pileus Git - ~andy/gtk/blob - gtk/gtkapplicationwindow.c

   1 /*
   2  * Copyright © 2011 Canonical Limited
   3  *
   4  * This library is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU Lesser General Public
   6  * License as published by the Free Software Foundation; either
   7  * version 2 of the licence, or (at your option) any later version.
   8  *
   9  * This library is distributed in the hope that it will be useful,
  10  * but 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
  16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17  * Boston, MA 02111-1307, USA.
  18  *
  19  * Author: Ryan Lortie <desrt@desrt.ca>
  20  */
  21
  22 #include "config.h"
  23
  24 #include "gtkapplicationwindow.h"
  25
  26 #include "gtkseparatormenuitem.h"
  27 #include "gtkcheckmenuitem.h"
  28 #include "gtkmenubar.h"
  29 #include "gactionmuxer.h"
  30
  31 struct _GtkApplicationWindowPrivate
  32 {
  33   GSimpleActionGroup *actions;
  34   GtkMenuBar *menubar;
  35
  36   gboolean show_app_menu;
  37 };
  38
  39 static gchar **
  40 gtk_application_window_list_actions (GActionGroup *group)
  41 {
  42   GtkApplicationWindow *window = GTK_APPLICATION_WINDOW (group);
  43
  44   return g_action_group_list_actions (G_ACTION_GROUP (window->priv->actions));
  45 }
  46
  47 static gboolean
  48 gtk_application_window_query_action (GActionGroup        *group,
  49                                      const gchar         *action_name,
  50                                      gboolean            *enabled,
  51                                      const GVariantType **parameter_type,
  52                                      const GVariantType **state_type,
  53                                      GVariant           **state_hint,
  54                                      GVariant           **state)
  55 {
  56   GtkApplicationWindow *window = GTK_APPLICATION_WINDOW (group);
  57
  58   return g_action_group_query_action (G_ACTION_GROUP (window->priv->actions),
  59                                       action_name, enabled, parameter_type, state_type, state_hint, state);
  60 }
  61
  62 static GAction *
  63 gtk_application_window_lookup_action (GActionMap *action_map,
  64                                       const gchar *action_name)
  65 {
  66   GtkApplicationWindow *window = GTK_APPLICATION_WINDOW (action_map);
  67
  68   return g_action_map_lookup_action (G_ACTION_MAP (window->priv->actions), action_name);
  69 }
  70
  71 static void
  72 gtk_application_window_add_action (GActionMap *action_map,
  73                                    GAction    *action)
  74 {
  75   GtkApplicationWindow *window = GTK_APPLICATION_WINDOW (action_map);
  76
  77   g_action_map_add_action (G_ACTION_MAP (window->priv->actions), action);
  78 }
  79
  80 static void
  81 gtk_application_window_remove_action (GActionMap  *action_map,
  82                                       const gchar *action_name)
  83 {
  84   GtkApplicationWindow *window = GTK_APPLICATION_WINDOW (action_map);
  85
  86   g_action_map_remove_action (G_ACTION_MAP (window->priv->actions), action_name);
  87 }
  88
  89 static void
  90 gtk_application_window_group_iface_init (GActionGroupInterface *iface)
  91 {
  92   iface->list_actions = gtk_application_window_list_actions;
  93   iface->query_action = gtk_application_window_query_action;
  94 }
  95
  96 static void
  97 gtk_application_window_map_iface_init (GActionMapInterface *iface)
  98 {
  99   iface->lookup_action = gtk_application_window_lookup_action;
 100   iface->add_action = gtk_application_window_add_action;
 101   iface->remove_action = gtk_application_window_remove_action;
 102 }
 103
 104 G_DEFINE_TYPE_WITH_CODE (GtkApplicationWindow, gtk_application_window, GTK_TYPE_WINDOW,
 105                          G_IMPLEMENT_INTERFACE (G_TYPE_ACTION_GROUP, gtk_application_window_group_iface_init)
 106                          G_IMPLEMENT_INTERFACE (G_TYPE_ACTION_MAP, gtk_application_window_map_iface_init))
 107
 108 enum {
 109   PROP_0,
 110   PROP_SHOW_APP_MENU,
 111   N_PROPS
 112 };
 113 static GParamSpec *gtk_application_window_properties[N_PROPS];
 114
 115 static void
 116 gtk_application_window_real_get_preferred_height (GtkWidget *widget,
 117                                                   gint      *minimum_height,
 118                                                   gint      *natural_height)
 119 {
 120   GtkApplicationWindow *window = GTK_APPLICATION_WINDOW (widget);
 121
 122   GTK_WIDGET_CLASS (gtk_application_window_parent_class)
 123     ->get_preferred_height (widget, minimum_height, natural_height);
 124
 125   if (window->priv->menubar != NULL)
 126     {
 127       gint menubar_min_height, menubar_nat_height;
 128
 129       gtk_widget_get_preferred_height (GTK_WIDGET (window->priv->menubar), &menubar_min_height, &menubar_nat_height);
 130       *minimum_height += menubar_min_height;
 131       *natural_height += menubar_nat_height;
 132     }
 133 }
 134
 135 static void
 136 gtk_application_window_real_get_preferred_height_for_width (GtkWidget *widget,
 137                                                             gint       width,
 138                                                             gint      *minimum_height,
 139                                                             gint      *natural_height)
 140 {
 141   GtkApplicationWindow *window = GTK_APPLICATION_WINDOW (widget);
 142
 143   GTK_WIDGET_CLASS (gtk_application_window_parent_class)
 144     ->get_preferred_height_for_width (widget, width, minimum_height, natural_height);
 145
 146   if (window->priv->menubar != NULL)
 147     {
 148       gint menubar_min_height, menubar_nat_height;
 149
 150       gtk_widget_get_preferred_height_for_width (GTK_WIDGET (window->priv->menubar), width, &menubar_min_height, &menubar_nat_height);
 151       *minimum_height += menubar_min_height;
 152       *natural_height += menubar_nat_height;
 153     }
 154 }
 155
 156 static void
 157 gtk_application_window_real_get_preferred_width (GtkWidget *widget,
 158                                                  gint      *minimum_width,
 159                                                  gint      *natural_width)
 160 {
 161   GtkApplicationWindow *window = GTK_APPLICATION_WINDOW (widget);
 162
 163   GTK_WIDGET_CLASS (gtk_application_window_parent_class)
 164     ->get_preferred_width (widget, minimum_width, natural_width);
 165
 166   if (window->priv->menubar != NULL)
 167     {
 168       gint menubar_min_width, menubar_nat_width;
 169
 170       gtk_widget_get_preferred_width (GTK_WIDGET (window->priv->menubar), &menubar_min_width, &menubar_nat_width);
 171       *minimum_width = MAX (*minimum_width, menubar_min_width);
 172       *natural_width = MAX (*natural_width, menubar_nat_width);
 173     }
 174 }
 175
 176 static void
 177 gtk_application_window_real_get_preferred_width_for_height (GtkWidget *widget,
 178                                                             gint       height,
 179                                                             gint      *minimum_width,
 180                                                             gint      *natural_width)
 181 {
 182   GtkApplicationWindow *window = GTK_APPLICATION_WINDOW (widget);
 183
 184   GTK_WIDGET_CLASS (gtk_application_window_parent_class)
 185     ->get_preferred_width_for_height (widget, height, minimum_width, natural_width);
 186
 187   if (window->priv->menubar != NULL)
 188     {
 189       gint menubar_min_width, menubar_nat_width;
 190
 191       gtk_widget_get_preferred_width_for_height (GTK_WIDGET (window->priv->menubar), height, &menubar_min_width, &menubar_nat_width);
 192       *minimum_width = MAX (*minimum_width, menubar_min_width);
 193       *natural_width = MAX (*natural_width, menubar_nat_width);
 194     }
 195 }
 196
 197 static void
 198 gtk_application_window_real_size_allocate (GtkWidget     *widget,
 199                                            GtkAllocation *allocation)
 200 {
 201   GtkApplicationWindow *window = GTK_APPLICATION_WINDOW (widget);
 202
 203   if (window->priv->menubar != NULL)
 204     {
 205       GtkAllocation menubar_allocation = *allocation;
 206       gint menubar_min_height, menubar_nat_height;
 207       GtkWidget *child;
 208
 209       gtk_widget_get_preferred_height_for_width (GTK_WIDGET (window->priv->menubar), allocation->width, &menubar_min_height, &menubar_nat_height);
 210
 211       menubar_allocation.height = menubar_min_height;
 212       gtk_widget_size_allocate (GTK_WIDGET (window->priv->menubar), &menubar_allocation);
 213
 214       child = gtk_bin_get_child (GTK_BIN (window));
 215       if (child != NULL && gtk_widget_get_visible (child))
 216         {
 217           GtkAllocation child_allocation = *allocation;
 218           gint border_width;
 219
 220           child_allocation.height = MAX (1, child_allocation.height - menubar_min_height);
 221
 222           border_width = gtk_container_get_border_width (GTK_CONTAINER (window));
 223           child_allocation.x += border_width;
 224           child_allocation.y += border_width + menubar_min_height;
 225           child_allocation.width -= border_width * 2;
 226           child_allocation.height -= border_width * 2 - menubar_min_height;
 227           gtk_widget_size_allocate (child, &child_allocation);
 228         }
 229
 230       gtk_widget_set_allocation (widget, allocation);
 231     }
 232   else
 233     GTK_WIDGET_CLASS (gtk_application_window_parent_class)
 234       ->size_allocate (widget, allocation);
 235 }
 236
 237 static void
 238 gtk_application_window_real_map (GtkWidget *widget)
 239 {
 240   GtkApplicationWindow *window = GTK_APPLICATION_WINDOW (widget);
 241
 242   /* XXX could elimate this by tweaking gtk_window_map */
 243   if (window->priv->menubar)
 244     gtk_widget_map (GTK_WIDGET (window->priv->menubar));
 245
 246   GTK_WIDGET_CLASS (gtk_application_window_parent_class)
 247     ->map (widget);
 248 }
 249
 250 static void
 251 gtk_application_window_real_forall_internal (GtkContainer *container,
 252                                              gboolean      include_internal,
 253                                              GtkCallback   callback,
 254                                              gpointer      user_data)
 255 {
 256   GtkApplicationWindow *window = GTK_APPLICATION_WINDOW (container);
 257
 258   if (window->priv->menubar)
 259     callback (GTK_WIDGET (window->priv->menubar), user_data);
 260
 261   GTK_CONTAINER_CLASS (gtk_application_window_parent_class)
 262     ->forall (container, include_internal, callback, user_data);
 263 }
 264
 265
 266 static void
 267 gtk_application_window_get_property (GObject *object, guint prop_id,
 268                                      GValue *value, GParamSpec *pspec)
 269 {
 270   GtkApplicationWindow *window = GTK_APPLICATION_WINDOW (object);
 271
 272   switch (prop_id)
 273     {
 274     case PROP_SHOW_APP_MENU:
 275       g_value_set_boolean (value, window->priv->show_app_menu);
 276       break;
 277
 278     default:
 279       g_assert_not_reached ();
 280     }
 281 }
 282
 283 static void
 284 gtk_application_window_set_property (GObject *object, guint prop_id,
 285                                      const GValue *value, GParamSpec *pspec)
 286 {
 287   GtkApplicationWindow *window = GTK_APPLICATION_WINDOW (object);
 288
 289   switch (prop_id)
 290     {
 291     case PROP_SHOW_APP_MENU:
 292       gtk_application_window_set_show_app_menu (window, g_value_get_boolean (value));
 293       break;
 294
 295     default:
 296       g_assert_not_reached ();
 297     }
 298 }
 299
 300 static void
 301 gtk_application_window_finalize (GObject *object)
 302 {
 303   GtkApplicationWindow *window = GTK_APPLICATION_WINDOW (object);
 304
 305   if (window->priv->menubar)
 306     g_object_unref (window->priv->menubar);
 307
 308   g_object_unref (window->priv->actions);
 309
 310   G_OBJECT_CLASS (gtk_application_window_parent_class)
 311     ->finalize (object);
 312 }
 313
 314 static void
 315 gtk_application_window_init (GtkApplicationWindow *window)
 316 {
 317   window->priv = G_TYPE_INSTANCE_GET_PRIVATE (window, GTK_TYPE_APPLICATION_WINDOW, GtkApplicationWindowPrivate);
 318
 319   window->priv->actions = g_simple_action_group_new ();
 320
 321   /* window->priv->actions is the one and only ref on the group, so when
 322    * we finalize, the action group will die, disconnecting all signals.
 323    */
 324   g_signal_connect_swapped (window->priv->actions, "action-added",
 325                             G_CALLBACK (g_action_group_action_added), window);
 326   g_signal_connect_swapped (window->priv->actions, "action-enabled-changed",
 327                             G_CALLBACK (g_action_group_action_enabled_changed), window);
 328   g_signal_connect_swapped (window->priv->actions, "action-state-changed",
 329                             G_CALLBACK (g_action_group_action_state_changed), window);
 330   g_signal_connect_swapped (window->priv->actions, "action-removed",
 331                             G_CALLBACK (g_action_group_action_removed), window);
 332 }
 333
 334 static void
 335 gtk_application_window_class_init (GtkApplicationWindowClass *class)
 336 {
 337   GtkContainerClass *container_class = GTK_CONTAINER_CLASS (class);
 338   GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
 339   GObjectClass *object_class = G_OBJECT_CLASS (class);
 340
 341   container_class->forall = gtk_application_window_real_forall_internal;
 342   widget_class->get_preferred_height = gtk_application_window_real_get_preferred_height;
 343   widget_class->get_preferred_height_for_width = gtk_application_window_real_get_preferred_height_for_width;
 344   widget_class->get_preferred_width = gtk_application_window_real_get_preferred_width;
 345   widget_class->get_preferred_width_for_height = gtk_application_window_real_get_preferred_width_for_height;
 346   widget_class->size_allocate = gtk_application_window_real_size_allocate;
 347   widget_class->map = gtk_application_window_real_map;
 348   object_class->get_property = gtk_application_window_get_property;
 349   object_class->set_property = gtk_application_window_set_property;
 350   object_class->finalize = gtk_application_window_finalize;
 351
 352   gtk_application_window_properties[PROP_SHOW_APP_MENU] =
 353     g_param_spec_boolean ("show-app-menu", "show application menu",
 354                           "TRUE if the application menu should be included in the menubar at the top of the window",
 355                           FALSE, G_PARAM_STATIC_STRINGS | G_PARAM_READWRITE);
 356   g_object_class_install_properties (object_class, N_PROPS, gtk_application_window_properties);
 357   g_type_class_add_private (class, sizeof (GtkApplicationWindowPrivate));
 358 }
 359
 360 GtkWidget *
 361 gtk_application_window_new (GtkApplication *application)
 362 {
 363   g_return_val_if_fail (GTK_IS_APPLICATION (application), NULL);
 364
 365   return g_object_new (GTK_TYPE_APPLICATION_WINDOW,
 366                        "application", application,
 367                        NULL);
 368 }
 369
 370 gboolean
 371 gtk_application_window_get_show_app_menu (GtkApplicationWindow *window)
 372 {
 373   return window->priv->show_app_menu;
 374 }
 375
 376 void
 377 gtk_application_window_set_show_app_menu (GtkApplicationWindow *window,
 378                                           gboolean              show_app_menu)
 379 {
 380   if (window->priv->show_app_menu != show_app_menu)
 381     {
 382       window->priv->show_app_menu = show_app_menu;
 383       g_object_notify_by_pspec (G_OBJECT (window), gtk_application_window_properties[PROP_SHOW_APP_MENU]);
 384
 385       if (show_app_menu)
 386         {
 387           GtkWidget *menubar;
 388           GtkWidget *item;
 389
 390           item = gtk_menu_item_new_with_label ("Application");
 391           gtk_menu_item_set_submenu (GTK_MENU_ITEM (item), gtk_application_window_get_app_menu (window));
 392
 393           menubar = gtk_menu_bar_new ();
 394           window->priv->menubar = g_object_ref_sink (menubar);
 395           gtk_menu_shell_append (GTK_MENU_SHELL (menubar), item);
 396           gtk_widget_set_parent (menubar, GTK_WIDGET (window));
 397           gtk_widget_show_all (menubar);
 398         }
 399       else
 400         {
 401           gtk_widget_unparent (GTK_WIDGET (window->priv->menubar));
 402           g_object_unref (window->priv->menubar);
 403         }
 404     }
 405 }
 406
 407 /* GtkMenu construction {{{1 */
 408
 409 typedef struct {
 410   GActionGroup *group;
 411   gchar        *name;
 412   gchar        *target;
 413   gulong        enabled_changed_id;
 414   gulong        state_changed_id;
 415   gulong        activate_handler;
 416 } ActionData;
 417
 418 static void
 419 action_data_free (gpointer data)
 420 {
 421   ActionData *a = data;
 422
 423   if (a->enabled_changed_id)
 424     g_signal_handler_disconnect (a->group, a->enabled_changed_id);
 425
 426   if (a->state_changed_id)
 427     g_signal_handler_disconnect (a->group, a->state_changed_id);
 428
 429   g_object_unref (a->group);
 430   g_free (a->name);
 431   g_free (a->target);
 432
 433   g_free (a);
 434 }
 435
 436 static void
 437 enabled_changed (GActionGroup *group,
 438                  const gchar  *action_name,
 439                  gboolean      enabled,
 440                  GtkWidget    *widget)
 441 {
 442   gtk_widget_set_sensitive (widget, enabled);
 443 }
 444
 445 static void
 446 item_activated (GtkWidget *w,
 447                 gpointer   data)
 448 {
 449   ActionData *a;
 450   GVariant *parameter;
 451
 452   a = g_object_get_data (G_OBJECT (w), "action");
 453   if (a->target)
 454     parameter = g_variant_ref_sink (g_variant_new_string (a->target));
 455   else
 456     parameter = NULL;
 457   g_action_group_activate_action (a->group, a->name, parameter);
 458   if (parameter)
 459     g_variant_unref (parameter);
 460 }
 461
 462 static void
 463 toggle_state_changed (GActionGroup     *group,
 464                       const gchar      *name,
 465                       GVariant         *state,
 466                       GtkCheckMenuItem *w)
 467 {
 468   ActionData *a;
 469
 470   a = g_object_get_data (G_OBJECT (w), "action");
 471   g_signal_handler_block (w, a->activate_handler);
 472   gtk_check_menu_item_set_active (w, g_variant_get_boolean (state));
 473   g_signal_handler_unblock (w, a->activate_handler);
 474 }
 475
 476 static void
 477 radio_state_changed (GActionGroup     *group,
 478                      const gchar      *name,
 479                      GVariant         *state,
 480                      GtkCheckMenuItem *w)
 481 {
 482   ActionData *a;
 483   gboolean b;
 484
 485   a = g_object_get_data (G_OBJECT (w), "action");
 486   g_signal_handler_block (w, a->activate_handler);
 487   b = g_strcmp0 (a->target, g_variant_get_string (state, NULL)) == 0;
 488   gtk_check_menu_item_set_active (w, b);
 489   g_signal_handler_unblock (w, a->activate_handler);
 490 }
 491
 492 static GtkWidget *
 493 create_menuitem_from_model (GMenuModel   *model,
 494                             gint          item,
 495                             GActionGroup *group)
 496 {
 497   GtkWidget *w;
 498   gchar *label;
 499   gchar *action;
 500   gchar *target;
 501   gchar *s;
 502   ActionData *a;
 503   const GVariantType *type;
 504   GVariant *v;
 505
 506   label = NULL;
 507   g_menu_model_get_item_attribute (model, item, G_MENU_ATTRIBUTE_LABEL, "s", &label);
 508
 509   action = NULL;
 510   g_menu_model_get_item_attribute (model, item, G_MENU_ATTRIBUTE_ACTION, "s", &action);
 511
 512   if (action != NULL)
 513     type = g_action_group_get_action_state_type (group, action);
 514   else
 515     type = NULL;
 516
 517   if (type == NULL)
 518     w = gtk_menu_item_new_with_mnemonic (label);
 519   else if (g_variant_type_equal (type, G_VARIANT_TYPE_BOOLEAN))
 520     w = gtk_check_menu_item_new_with_label (label);
 521   else if (g_variant_type_equal (type, G_VARIANT_TYPE_STRING))
 522     {
 523       w = gtk_check_menu_item_new_with_label (label);
 524       gtk_check_menu_item_set_draw_as_radio (GTK_CHECK_MENU_ITEM (w), TRUE);
 525     }
 526   else
 527     g_assert_not_reached ();
 528
 529   if (action != NULL)
 530     {
 531       a = g_new0 (ActionData, 1);
 532       a->group = g_object_ref (group);
 533       a->name = g_strdup (action);
 534       g_object_set_data_full (G_OBJECT (w), "action", a, action_data_free);
 535
 536       if (!g_action_group_get_action_enabled (group, action))
 537         gtk_widget_set_sensitive (w, FALSE);
 538
 539       s = g_strconcat ("action-enabled-changed::", action, NULL);
 540       a->enabled_changed_id = g_signal_connect (group, s,
 541                                                 G_CALLBACK (enabled_changed), w);
 542       g_free (s);
 543       a->activate_handler = g_signal_connect (w, "activate",
 544                                               G_CALLBACK (item_activated), NULL);
 545
 546       if (type == NULL)
 547         {
 548           /* all set */
 549         }
 550       else if (g_variant_type_equal (type, G_VARIANT_TYPE_BOOLEAN))
 551         {
 552           s = g_strconcat ("action-state-changed::", action, NULL);
 553           a->state_changed_id = g_signal_connect (group, s,
 554                                                   G_CALLBACK (toggle_state_changed), w);
 555           g_free (s);
 556           v = g_action_group_get_action_state (group, action);
 557           gtk_check_menu_item_set_active (GTK_CHECK_MENU_ITEM (w),
 558                                           g_variant_get_boolean (v));
 559           g_variant_unref (v);
 560         }
 561       else if (g_variant_type_equal (type, G_VARIANT_TYPE_STRING))
 562         {
 563           s = g_strconcat ("action-state-changed::", action, NULL);
 564           a->state_changed_id = g_signal_connect (group, s,
 565                                                   G_CALLBACK (radio_state_changed), w);
 566           g_free (s);
 567           g_menu_model_get_item_attribute (model, item, G_MENU_ATTRIBUTE_TARGET, "s", &target);
 568           a->target = g_strdup (target);
 569           v = g_action_group_get_action_state (group, action);
 570           gtk_check_menu_item_set_active (GTK_CHECK_MENU_ITEM (w),
 571                                           g_strcmp0 (g_variant_get_string (v, NULL), target) == 0);
 572           g_variant_unref (v);
 573           g_free (target);
 574         }
 575       else
 576         g_assert_not_reached ();
 577     }
 578
 579   g_free (label);
 580   g_free (action);
 581
 582   return w;
 583 }
 584
 585 static void populate_menu_from_model (GtkMenuShell *menu,
 586                                       GMenuModel   *model,
 587                                       GActionGroup *group);
 588
 589 static void
 590 append_items_from_model (GtkMenuShell *menu,
 591                          GMenuModel   *model,
 592                          GActionGroup *group,
 593                          gboolean     *need_separator,
 594                          const gchar  *heading)
 595 {
 596   gint n;
 597   gint i;
 598   GtkWidget *w;
 599   GtkWidget *menuitem;
 600   GtkWidget *submenu;
 601   GMenuModel *m;
 602   gchar *label;
 603
 604   n = g_menu_model_get_n_items (model);
 605
 606   if (*need_separator && n > 0)
 607     {
 608       w = gtk_separator_menu_item_new ();
 609       gtk_widget_show (w);
 610       gtk_menu_shell_append (menu, w);
 611       *need_separator = FALSE;
 612     }
 613
 614   if (heading != NULL)
 615     {
 616       w = gtk_menu_item_new_with_label (heading);
 617       gtk_widget_show (w);
 618       gtk_widget_set_sensitive (w, FALSE);
 619       gtk_menu_shell_append (GTK_MENU_SHELL (menu), w);
 620     }
 621
 622   for (i = 0; i < n; i++)
 623     {
 624       if ((m = g_menu_model_get_item_link (model, i, G_MENU_LINK_SECTION)))
 625         {
 626           label = NULL;
 627           g_menu_model_get_item_attribute (model, i, G_MENU_ATTRIBUTE_LABEL, "s", &label);
 628           append_items_from_model (menu, m, group, need_separator, label);
 629           g_object_unref (m);
 630           g_free (label);
 631           continue;
 632         }
 633
 634       if (*need_separator)
 635         {
 636           w = gtk_separator_menu_item_new ();
 637           gtk_widget_show (w);
 638           gtk_menu_shell_append (menu, w);
 639           *need_separator = FALSE;
 640         }
 641
 642       menuitem = create_menuitem_from_model (model, i, group);
 643
 644       if ((m = g_menu_model_get_item_link (model, i, G_MENU_LINK_SUBMENU)))
 645         {
 646           submenu = gtk_menu_new ();
 647           populate_menu_from_model (GTK_MENU_SHELL (submenu), m, group);
 648           gtk_menu_item_set_submenu (GTK_MENU_ITEM (menuitem), submenu);
 649           g_object_unref (m);
 650         }
 651
 652       gtk_widget_show (menuitem);
 653       gtk_menu_shell_append (menu, menuitem);
 654
 655       *need_separator = TRUE;
 656     }
 657 }
 658
 659 static void
 660 populate_menu_from_model (GtkMenuShell *menu,
 661                           GMenuModel   *model,
 662                           GActionGroup *group)
 663 {
 664   gboolean need_separator;
 665
 666   need_separator = FALSE;
 667   append_items_from_model (menu, model, group, &need_separator, NULL);
 668 }
 669
 670 typedef struct {
 671   GtkApplication *application;
 672   GtkMenuShell   *menu;
 673   guint           update_idle;
 674   GHashTable     *connected;
 675 } ItemsChangedData;
 676
 677 static void
 678 free_items_changed_data (gpointer data)
 679 {
 680   ItemsChangedData *d = data;
 681
 682   g_object_unref (d->application);
 683
 684   if (d->update_idle != 0)
 685     g_source_remove (d->update_idle);
 686
 687   g_hash_table_unref (d->connected);
 688
 689   g_free (d);
 690 }
 691
 692 static gboolean
 693 repopulate_menu (gpointer data)
 694 {
 695   ItemsChangedData *d = data;
 696   GList *children, *l;
 697   GtkWidget *child;
 698   GMenuModel *model;
 699
 700   /* remove current children */
 701   children = gtk_container_get_children (GTK_CONTAINER (d->menu));
 702   for (l = children; l; l = l->next)
 703     {
 704       child = l->data;
 705       gtk_container_remove (GTK_CONTAINER (d->menu), child);
 706     }
 707   g_list_free (children);
 708
 709   /* repopulate */
 710   model = g_application_get_menu (G_APPLICATION (d->application));
 711   populate_menu_from_model (d->menu, model, G_ACTION_GROUP (d->application));
 712
 713   d->update_idle = 0;
 714
 715   return FALSE;
 716 }
 717
 718 static void
 719 connect_to_items_changed (GMenuModel *model,
 720                           GCallback   callback,
 721                           gpointer    data)
 722 {
 723   ItemsChangedData *d = data;
 724   gint i;
 725   GMenuModel *m;
 726   GMenuLinkIter *iter;
 727
 728   if (!g_hash_table_lookup (d->connected, model))
 729     {
 730       g_signal_connect (model, "items-changed", callback, data);
 731       g_hash_table_insert (d->connected, model, model);
 732     }
 733
 734   for (i = 0; i < g_menu_model_get_n_items (model); i++)
 735     {
 736       iter = g_menu_model_iterate_item_links (model, i);
 737       while (g_menu_link_iter_next (iter))
 738         {
 739           m = g_menu_link_iter_get_value (iter);
 740           connect_to_items_changed (m, callback, data);
 741           g_object_unref (m);
 742         }
 743       g_object_unref (iter);
 744     }
 745 }
 746
 747 static void
 748 items_changed (GMenuModel *model,
 749                gint        position,
 750                gint        removed,
 751                gint        added,
 752                gpointer    data)
 753 {
 754   ItemsChangedData *d = data;
 755
 756   if (d->update_idle == 0)
 757     d->update_idle = gdk_threads_add_idle (repopulate_menu, data);
 758   connect_to_items_changed (model, G_CALLBACK (items_changed), data);
 759 }
 760
 761 /**
 762  * gtk_application_window_get_app_menu:
 763  * @application: a #GtkApplication
 764  *
 765  * Populates a menu widget from a menu model that is
 766  * associated with @application. See g_application_set_menu().
 767  * The menu items will be connected to action of @application,
 768  * as indicated by the menu model. The menus contents will be
 769  * updated automatically in response to menu model changes.
 770  *
 771  * It is the callers responsibility to add the menu at a
 772  * suitable place in the widget hierarchy.
 773  *
 774  * This function returns %NULL if @application has no associated
 775  * menu model. It also returns %NULL if the menu model is
 776  * represented outside the application, e.g. by an application
 777  * menu in the desktop shell.
 778  *
 779  * @menu may be a #GtkMenu or a #GtkMenuBar.
 780  *
 781  * Returns: A #GtkMenu that has been populated from the
 782  *     #GMenuModel that is associated with @application,
 783  *     or %NULL
 784  */
 785 GtkWidget *
 786 gtk_application_window_get_app_menu (GtkApplicationWindow *window)
 787 {
 788   GtkApplication *application;
 789   GtkWidget *menu;
 790   GMenuModel *model;
 791   ItemsChangedData *data;
 792   GActionMuxer *muxer;
 793
 794   application = gtk_window_get_application (GTK_WINDOW (window));
 795
 796   model = g_application_get_menu (G_APPLICATION (application));
 797
 798   if (!model)
 799     return NULL;
 800
 801   menu = gtk_menu_new ();
 802
 803   muxer = g_action_muxer_new ();
 804   g_action_muxer_insert (muxer, "app", G_ACTION_GROUP (application));
 805   g_action_muxer_insert (muxer, "win", G_ACTION_GROUP (window));
 806   populate_menu_from_model (GTK_MENU_SHELL (menu), model, G_ACTION_GROUP (muxer));
 807   g_object_unref (muxer);
 808
 809   data = g_new (ItemsChangedData, 1);
 810   data->application = g_object_ref (application);
 811   data->menu = GTK_MENU_SHELL (menu);
 812   data->update_idle = 0;
 813   data->connected = g_hash_table_new (NULL, NULL);
 814
 815   g_object_set_data_full (G_OBJECT (menu), "gtk-application-menu-data",
 816                           data, free_items_changed_data);
 817
 818   connect_to_items_changed (model, G_CALLBACK (items_changed), data);
 819
 820   return menu;
 821 }