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 /**
  32  * SECTION:gtkapplicationwindow
  33  * @title: GtkApplicationWindow
  34  * @short_description: GtkWindow subclass with GtkApplication support
  35  *
  36  * GtkApplicationWindow is a #GtkWindow subclass that offers some extra
  37  * functionality for better integration with #GtkApplication features.
  38  * It implements the #GActionGroup and #GActionMap interfaces, to let
  39  * you add window-specific actions that will be exported by the associated
  40  * #GtkApplication, together with its application-wide actions.
  41  * Window-specific actions are prefixed with the "win." prefix and
  42  * application-wide actions are prefixed with the "app." prefix.
  43  * Actions must be addressed with the prefixed name when referring
  44  * to them from a #GMenuModel.
  45  *
  46  * If the desktop environment does not display the application menu
  47  * as part of the desktop shell, then #GApplicationWindow will
  48  * automatically show the menu as part of a menubar. This behaviour
  49  * can be overridden with the #GtkApplicationWindow:show-app-menu
  50  * property.
  51  */
  52
  53 struct _GtkApplicationWindowPrivate
  54 {
  55   GSimpleActionGroup *actions;
  56   GtkMenuBar *menubar;
  57
  58   guint initialized_app_menu : 1;
  59   guint default_show_app_menu : 1;
  60   guint did_override_show_app_menu : 1;
  61   guint override_show_app_menu : 1;
  62 };
  63
  64 static void
  65 recalculate_app_menu_state (GtkApplicationWindow   *window);
  66
  67 static void
  68 on_shell_shows_app_menu_changed (GtkSettings   *settings,
  69                                  GParamSpec    *pspec,
  70                                  gpointer       user_data)
  71 {
  72   GtkApplicationWindow *window = GTK_APPLICATION_WINDOW (user_data);
  73   gboolean val;
  74
  75   g_object_get (settings, "gtk-shell-shows-app-menu", &val, NULL);
  76   window->priv->default_show_app_menu = !val;
  77   recalculate_app_menu_state (window);
  78 }
  79
  80 static gchar **
  81 gtk_application_window_list_actions (GActionGroup *group)
  82 {
  83   GtkApplicationWindow *window = GTK_APPLICATION_WINDOW (group);
  84
  85   return g_action_group_list_actions (G_ACTION_GROUP (window->priv->actions));
  86 }
  87
  88 static gboolean
  89 gtk_application_window_query_action (GActionGroup        *group,
  90                                      const gchar         *action_name,
  91                                      gboolean            *enabled,
  92                                      const GVariantType **parameter_type,
  93                                      const GVariantType **state_type,
  94                                      GVariant           **state_hint,
  95                                      GVariant           **state)
  96 {
  97   GtkApplicationWindow *window = GTK_APPLICATION_WINDOW (group);
  98
  99   return g_action_group_query_action (G_ACTION_GROUP (window->priv->actions),
 100                                       action_name, enabled, parameter_type, state_type, state_hint, state);
 101 }
 102
 103 static void
 104 gtk_application_window_activate_action (GActionGroup *group,
 105                                         const gchar  *action_name,
 106                                         GVariant     *parameter)
 107 {
 108   GtkApplicationWindow *window = GTK_APPLICATION_WINDOW (group);
 109
 110   return g_action_group_activate_action (G_ACTION_GROUP (window->priv->actions), action_name, parameter);
 111 }
 112
 113 static void
 114 gtk_application_window_change_action_state (GActionGroup *group,
 115                                             const gchar  *action_name,
 116                                             GVariant     *state)
 117 {
 118   GtkApplicationWindow *window = GTK_APPLICATION_WINDOW (group);
 119
 120   return g_action_group_change_action_state (G_ACTION_GROUP (window->priv->actions), action_name, state);
 121 }
 122
 123 static GAction *
 124 gtk_application_window_lookup_action (GActionMap *action_map,
 125                                       const gchar *action_name)
 126 {
 127   GtkApplicationWindow *window = GTK_APPLICATION_WINDOW (action_map);
 128
 129   return g_action_map_lookup_action (G_ACTION_MAP (window->priv->actions), action_name);
 130 }
 131
 132 static void
 133 gtk_application_window_add_action (GActionMap *action_map,
 134                                    GAction    *action)
 135 {
 136   GtkApplicationWindow *window = GTK_APPLICATION_WINDOW (action_map);
 137
 138   g_action_map_add_action (G_ACTION_MAP (window->priv->actions), action);
 139 }
 140
 141 static void
 142 gtk_application_window_remove_action (GActionMap  *action_map,
 143                                       const gchar *action_name)
 144 {
 145   GtkApplicationWindow *window = GTK_APPLICATION_WINDOW (action_map);
 146
 147   g_action_map_remove_action (G_ACTION_MAP (window->priv->actions), action_name);
 148 }
 149
 150 static void
 151 gtk_application_window_group_iface_init (GActionGroupInterface *iface)
 152 {
 153   iface->list_actions = gtk_application_window_list_actions;
 154   iface->query_action = gtk_application_window_query_action;
 155   iface->activate_action = gtk_application_window_activate_action;
 156   iface->change_action_state = gtk_application_window_change_action_state;
 157 }
 158
 159 static void
 160 gtk_application_window_map_iface_init (GActionMapInterface *iface)
 161 {
 162   iface->lookup_action = gtk_application_window_lookup_action;
 163   iface->add_action = gtk_application_window_add_action;
 164   iface->remove_action = gtk_application_window_remove_action;
 165 }
 166
 167 G_DEFINE_TYPE_WITH_CODE (GtkApplicationWindow, gtk_application_window, GTK_TYPE_WINDOW,
 168                          G_IMPLEMENT_INTERFACE (G_TYPE_ACTION_GROUP, gtk_application_window_group_iface_init)
 169                          G_IMPLEMENT_INTERFACE (G_TYPE_ACTION_MAP, gtk_application_window_map_iface_init))
 170
 171 enum {
 172   PROP_0,
 173   PROP_SHOW_APP_MENU,
 174   N_PROPS
 175 };
 176 static GParamSpec *gtk_application_window_properties[N_PROPS];
 177
 178 static void
 179 gtk_application_window_real_get_preferred_height (GtkWidget *widget,
 180                                                   gint      *minimum_height,
 181                                                   gint      *natural_height)
 182 {
 183   GtkApplicationWindow *window = GTK_APPLICATION_WINDOW (widget);
 184
 185   GTK_WIDGET_CLASS (gtk_application_window_parent_class)
 186     ->get_preferred_height (widget, minimum_height, natural_height);
 187
 188   if (window->priv->menubar != NULL)
 189     {
 190       gint menubar_min_height, menubar_nat_height;
 191
 192       gtk_widget_get_preferred_height (GTK_WIDGET (window->priv->menubar), &menubar_min_height, &menubar_nat_height);
 193       *minimum_height += menubar_min_height;
 194       *natural_height += menubar_nat_height;
 195     }
 196 }
 197
 198 static void
 199 gtk_application_window_real_get_preferred_height_for_width (GtkWidget *widget,
 200                                                             gint       width,
 201                                                             gint      *minimum_height,
 202                                                             gint      *natural_height)
 203 {
 204   GtkApplicationWindow *window = GTK_APPLICATION_WINDOW (widget);
 205
 206   GTK_WIDGET_CLASS (gtk_application_window_parent_class)
 207     ->get_preferred_height_for_width (widget, width, minimum_height, natural_height);
 208
 209   if (window->priv->menubar != NULL)
 210     {
 211       gint menubar_min_height, menubar_nat_height;
 212
 213       gtk_widget_get_preferred_height_for_width (GTK_WIDGET (window->priv->menubar), width, &menubar_min_height, &menubar_nat_height);
 214       *minimum_height += menubar_min_height;
 215       *natural_height += menubar_nat_height;
 216     }
 217 }
 218
 219 static void
 220 gtk_application_window_real_get_preferred_width (GtkWidget *widget,
 221                                                  gint      *minimum_width,
 222                                                  gint      *natural_width)
 223 {
 224   GtkApplicationWindow *window = GTK_APPLICATION_WINDOW (widget);
 225
 226   GTK_WIDGET_CLASS (gtk_application_window_parent_class)
 227     ->get_preferred_width (widget, minimum_width, natural_width);
 228
 229   if (window->priv->menubar != NULL)
 230     {
 231       gint menubar_min_width, menubar_nat_width;
 232
 233       gtk_widget_get_preferred_width (GTK_WIDGET (window->priv->menubar), &menubar_min_width, &menubar_nat_width);
 234       *minimum_width = MAX (*minimum_width, menubar_min_width);
 235       *natural_width = MAX (*natural_width, menubar_nat_width);
 236     }
 237 }
 238
 239 static void
 240 gtk_application_window_real_get_preferred_width_for_height (GtkWidget *widget,
 241                                                             gint       height,
 242                                                             gint      *minimum_width,
 243                                                             gint      *natural_width)
 244 {
 245   GtkApplicationWindow *window = GTK_APPLICATION_WINDOW (widget);
 246
 247   GTK_WIDGET_CLASS (gtk_application_window_parent_class)
 248     ->get_preferred_width_for_height (widget, height, minimum_width, natural_width);
 249
 250   if (window->priv->menubar != NULL)
 251     {
 252       gint menubar_min_width, menubar_nat_width;
 253
 254       gtk_widget_get_preferred_width_for_height (GTK_WIDGET (window->priv->menubar), height, &menubar_min_width, &menubar_nat_width);
 255       *minimum_width = MAX (*minimum_width, menubar_min_width);
 256       *natural_width = MAX (*natural_width, menubar_nat_width);
 257     }
 258 }
 259
 260 static void
 261 gtk_application_window_real_size_allocate (GtkWidget     *widget,
 262                                            GtkAllocation *allocation)
 263 {
 264   GtkApplicationWindow *window = GTK_APPLICATION_WINDOW (widget);
 265
 266   if (window->priv->menubar != NULL)
 267     {
 268       GtkAllocation menubar_allocation = *allocation;
 269       gint menubar_min_height, menubar_nat_height;
 270       GtkWidget *child;
 271
 272       gtk_widget_get_preferred_height_for_width (GTK_WIDGET (window->priv->menubar), allocation->width, &menubar_min_height, &menubar_nat_height);
 273
 274       menubar_allocation.height = menubar_min_height;
 275       gtk_widget_size_allocate (GTK_WIDGET (window->priv->menubar), &menubar_allocation);
 276
 277       child = gtk_bin_get_child (GTK_BIN (window));
 278       if (child != NULL && gtk_widget_get_visible (child))
 279         {
 280           GtkAllocation child_allocation = *allocation;
 281           gint border_width;
 282
 283           child_allocation.height = MAX (1, child_allocation.height - menubar_min_height);
 284
 285           border_width = gtk_container_get_border_width (GTK_CONTAINER (window));
 286           child_allocation.x += border_width;
 287           child_allocation.y += border_width + menubar_min_height;
 288           child_allocation.width -= border_width * 2;
 289           child_allocation.height -= border_width * 2 - menubar_min_height;
 290           gtk_widget_size_allocate (child, &child_allocation);
 291         }
 292
 293       gtk_widget_set_allocation (widget, allocation);
 294     }
 295   else
 296     GTK_WIDGET_CLASS (gtk_application_window_parent_class)
 297       ->size_allocate (widget, allocation);
 298 }
 299
 300 static void
 301 gtk_application_window_real_realize (GtkWidget *widget)
 302 {
 303   GtkApplicationWindow *window = GTK_APPLICATION_WINDOW (widget);
 304
 305   if (!window->priv->initialized_app_menu)
 306     {
 307       window->priv->initialized_app_menu = TRUE;
 308       g_signal_connect (gtk_widget_get_settings ((GtkWidget*)window),
 309                         "notify::gtk-shell-shows-app-menu",
 310                         G_CALLBACK (on_shell_shows_app_menu_changed),
 311                         window);
 312       on_shell_shows_app_menu_changed (gtk_widget_get_settings ((GtkWidget*)window), NULL, window);
 313     }
 314
 315   GTK_WIDGET_CLASS (gtk_application_window_parent_class)
 316     ->realize (widget);
 317 }
 318
 319 static void
 320 gtk_application_window_real_map (GtkWidget *widget)
 321 {
 322   GtkApplicationWindow *window = GTK_APPLICATION_WINDOW (widget);
 323
 324   /* XXX could elimate this by tweaking gtk_window_map */
 325   if (window->priv->menubar)
 326     gtk_widget_map (GTK_WIDGET (window->priv->menubar));
 327
 328   GTK_WIDGET_CLASS (gtk_application_window_parent_class)
 329     ->map (widget);
 330 }
 331
 332 static void
 333 gtk_application_window_real_forall_internal (GtkContainer *container,
 334                                              gboolean      include_internal,
 335                                              GtkCallback   callback,
 336                                              gpointer      user_data)
 337 {
 338   GtkApplicationWindow *window = GTK_APPLICATION_WINDOW (container);
 339
 340   if (window->priv->menubar)
 341     callback (GTK_WIDGET (window->priv->menubar), user_data);
 342
 343   GTK_CONTAINER_CLASS (gtk_application_window_parent_class)
 344     ->forall (container, include_internal, callback, user_data);
 345 }
 346
 347
 348 static void
 349 gtk_application_window_get_property (GObject *object, guint prop_id,
 350                                      GValue *value, GParamSpec *pspec)
 351 {
 352   GtkApplicationWindow *window = GTK_APPLICATION_WINDOW (object);
 353
 354   switch (prop_id)
 355     {
 356     case PROP_SHOW_APP_MENU:
 357       g_value_set_boolean (value, window->priv->override_show_app_menu);
 358       break;
 359
 360     default:
 361       g_assert_not_reached ();
 362     }
 363 }
 364
 365 static void
 366 gtk_application_window_set_property (GObject *object, guint prop_id,
 367                                      const GValue *value, GParamSpec *pspec)
 368 {
 369   GtkApplicationWindow *window = GTK_APPLICATION_WINDOW (object);
 370
 371   switch (prop_id)
 372     {
 373     case PROP_SHOW_APP_MENU:
 374       gtk_application_window_set_show_app_menu (window, g_value_get_boolean (value));
 375       break;
 376
 377     default:
 378       g_assert_not_reached ();
 379     }
 380 }
 381
 382 static void
 383 gtk_application_window_dispose (GObject *object)
 384 {
 385   GtkApplicationWindow *window = GTK_APPLICATION_WINDOW (object);
 386
 387   g_clear_object (&window->priv->menubar);
 388   g_clear_object (&window->priv->actions);
 389
 390   G_OBJECT_CLASS (gtk_application_window_parent_class)
 391     ->dispose (object);
 392 }
 393
 394 static void
 395 gtk_application_window_init (GtkApplicationWindow *window)
 396 {
 397   window->priv = G_TYPE_INSTANCE_GET_PRIVATE (window, GTK_TYPE_APPLICATION_WINDOW, GtkApplicationWindowPrivate);
 398
 399   window->priv->actions = g_simple_action_group_new ();
 400
 401   /* window->priv->actions is the one and only ref on the group, so when
 402    * we dispose, the action group will die, disconnecting all signals.
 403    */
 404   g_signal_connect_swapped (window->priv->actions, "action-added",
 405                             G_CALLBACK (g_action_group_action_added), window);
 406   g_signal_connect_swapped (window->priv->actions, "action-enabled-changed",
 407                             G_CALLBACK (g_action_group_action_enabled_changed), window);
 408   g_signal_connect_swapped (window->priv->actions, "action-state-changed",
 409                             G_CALLBACK (g_action_group_action_state_changed), window);
 410   g_signal_connect_swapped (window->priv->actions, "action-removed",
 411                             G_CALLBACK (g_action_group_action_removed), window);
 412 }
 413
 414 static void
 415 gtk_application_window_class_init (GtkApplicationWindowClass *class)
 416 {
 417   GtkContainerClass *container_class = GTK_CONTAINER_CLASS (class);
 418   GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (class);
 419   GObjectClass *object_class = G_OBJECT_CLASS (class);
 420
 421   container_class->forall = gtk_application_window_real_forall_internal;
 422   widget_class->get_preferred_height = gtk_application_window_real_get_preferred_height;
 423   widget_class->get_preferred_height_for_width = gtk_application_window_real_get_preferred_height_for_width;
 424   widget_class->get_preferred_width = gtk_application_window_real_get_preferred_width;
 425   widget_class->get_preferred_width_for_height = gtk_application_window_real_get_preferred_width_for_height;
 426   widget_class->size_allocate = gtk_application_window_real_size_allocate;
 427   widget_class->realize = gtk_application_window_real_realize;
 428   widget_class->map = gtk_application_window_real_map;
 429   object_class->get_property = gtk_application_window_get_property;
 430   object_class->set_property = gtk_application_window_set_property;
 431   object_class->dispose = gtk_application_window_dispose;
 432
 433   gtk_application_window_properties[PROP_SHOW_APP_MENU] =
 434     g_param_spec_boolean ("show-app-menu", "show application menu",
 435                           "TRUE if the application menu should be included in the menubar at the top of the window",
 436                           FALSE, G_PARAM_STATIC_STRINGS | G_PARAM_READWRITE);
 437   g_object_class_install_properties (object_class, N_PROPS, gtk_application_window_properties);
 438   g_type_class_add_private (class, sizeof (GtkApplicationWindowPrivate));
 439 }
 440
 441 GtkWidget *
 442 gtk_application_window_new (GtkApplication *application)
 443 {
 444   g_return_val_if_fail (GTK_IS_APPLICATION (application), NULL);
 445
 446   return g_object_new (GTK_TYPE_APPLICATION_WINDOW,
 447                        "application", application,
 448                        NULL);
 449 }
 450
 451 gboolean
 452 gtk_application_window_get_show_app_menu (GtkApplicationWindow *window)
 453 {
 454   return window->priv->override_show_app_menu;
 455 }
 456
 457 static void
 458 recalculate_app_menu_state (GtkApplicationWindow   *window)
 459 {
 460   if ((window->priv->did_override_show_app_menu
 461        && window->priv->override_show_app_menu)
 462       || window->priv->default_show_app_menu)
 463     {
 464       GtkWidget *menubar;
 465       GtkWidget *item;
 466
 467       item = gtk_menu_item_new_with_label ("Application");
 468       gtk_menu_item_set_submenu (GTK_MENU_ITEM (item), gtk_application_window_get_app_menu (window));
 469
 470       menubar = gtk_menu_bar_new ();
 471       window->priv->menubar = g_object_ref_sink (menubar);
 472       gtk_menu_shell_append (GTK_MENU_SHELL (menubar), item);
 473       gtk_widget_set_parent (menubar, GTK_WIDGET (window));
 474       gtk_widget_show_all (menubar);
 475     }
 476   else
 477     {
 478       gtk_widget_unparent (GTK_WIDGET (window->priv->menubar));
 479       g_object_unref (window->priv->menubar);
 480     }
 481 }
 482
 483 void
 484 gtk_application_window_set_show_app_menu (GtkApplicationWindow *window,
 485                                           gboolean              show_app_menu)
 486 {
 487   show_app_menu = !!show_app_menu;
 488   window->priv->did_override_show_app_menu = TRUE;
 489   if (window->priv->override_show_app_menu != show_app_menu)
 490     {
 491       window->priv->override_show_app_menu = show_app_menu;
 492       recalculate_app_menu_state (window);
 493       g_object_notify_by_pspec (G_OBJECT (window), gtk_application_window_properties[PROP_SHOW_APP_MENU]);
 494     }
 495 }
 496
 497 /* GtkMenu construction {{{1 */
 498
 499 typedef struct {
 500   GActionGroup *group;
 501   gchar        *name;
 502   gchar        *target;
 503   gulong        enabled_changed_id;
 504   gulong        state_changed_id;
 505   gulong        activate_handler;
 506 } ActionData;
 507
 508 static void
 509 action_data_free (gpointer data)
 510 {
 511   ActionData *a = data;
 512
 513   if (a->enabled_changed_id)
 514     g_signal_handler_disconnect (a->group, a->enabled_changed_id);
 515
 516   if (a->state_changed_id)
 517     g_signal_handler_disconnect (a->group, a->state_changed_id);
 518
 519   g_object_unref (a->group);
 520   g_free (a->name);
 521   g_free (a->target);
 522
 523   g_free (a);
 524 }
 525
 526 static void
 527 enabled_changed (GActionGroup *group,
 528                  const gchar  *action_name,
 529                  gboolean      enabled,
 530                  GtkWidget    *widget)
 531 {
 532   gtk_widget_set_sensitive (widget, enabled);
 533 }
 534
 535 static void
 536 item_activated (GtkWidget *w,
 537                 gpointer   data)
 538 {
 539   ActionData *a;
 540   GVariant *parameter;
 541
 542   a = g_object_get_data (G_OBJECT (w), "action");
 543   if (a->target)
 544     parameter = g_variant_ref_sink (g_variant_new_string (a->target));
 545   else
 546     parameter = NULL;
 547   g_action_group_activate_action (a->group, a->name, parameter);
 548   if (parameter)
 549     g_variant_unref (parameter);
 550 }
 551
 552 static void
 553 toggle_state_changed (GActionGroup     *group,
 554                       const gchar      *name,
 555                       GVariant         *state,
 556                       GtkCheckMenuItem *w)
 557 {
 558   ActionData *a;
 559
 560   a = g_object_get_data (G_OBJECT (w), "action");
 561   g_signal_handler_block (w, a->activate_handler);
 562   gtk_check_menu_item_set_active (w, g_variant_get_boolean (state));
 563   g_signal_handler_unblock (w, a->activate_handler);
 564 }
 565
 566 static void
 567 radio_state_changed (GActionGroup     *group,
 568                      const gchar      *name,
 569                      GVariant         *state,
 570                      GtkCheckMenuItem *w)
 571 {
 572   ActionData *a;
 573   gboolean b;
 574
 575   a = g_object_get_data (G_OBJECT (w), "action");
 576   g_signal_handler_block (w, a->activate_handler);
 577   b = g_strcmp0 (a->target, g_variant_get_string (state, NULL)) == 0;
 578   gtk_check_menu_item_set_active (w, b);
 579   g_signal_handler_unblock (w, a->activate_handler);
 580 }
 581
 582 static GtkWidget *
 583 create_menuitem_from_model (GMenuModel   *model,
 584                             gint          item,
 585                             GActionGroup *group)
 586 {
 587   GtkWidget *w;
 588   gchar *label;
 589   gchar *action;
 590   gchar *target;
 591   gchar *s;
 592   ActionData *a;
 593   const GVariantType *type;
 594   GVariant *v;
 595
 596   label = NULL;
 597   g_menu_model_get_item_attribute (model, item, G_MENU_ATTRIBUTE_LABEL, "s", &label);
 598
 599   action = NULL;
 600   g_menu_model_get_item_attribute (model, item, G_MENU_ATTRIBUTE_ACTION, "s", &action);
 601
 602   if (action != NULL)
 603     type = g_action_group_get_action_state_type (group, action);
 604   else
 605     type = NULL;
 606
 607   if (type == NULL)
 608     w = gtk_menu_item_new_with_mnemonic (label);
 609   else if (g_variant_type_equal (type, G_VARIANT_TYPE_BOOLEAN))
 610     w = gtk_check_menu_item_new_with_label (label);
 611   else if (g_variant_type_equal (type, G_VARIANT_TYPE_STRING))
 612     {
 613       w = gtk_check_menu_item_new_with_label (label);
 614       gtk_check_menu_item_set_draw_as_radio (GTK_CHECK_MENU_ITEM (w), TRUE);
 615     }
 616   else
 617     g_assert_not_reached ();
 618
 619   if (action != NULL)
 620     {
 621       a = g_new0 (ActionData, 1);
 622       a->group = g_object_ref (group);
 623       a->name = g_strdup (action);
 624       g_object_set_data_full (G_OBJECT (w), "action", a, action_data_free);
 625
 626       if (!g_action_group_get_action_enabled (group, action))
 627         gtk_widget_set_sensitive (w, FALSE);
 628
 629       s = g_strconcat ("action-enabled-changed::", action, NULL);
 630       a->enabled_changed_id = g_signal_connect (group, s,
 631                                                 G_CALLBACK (enabled_changed), w);
 632       g_free (s);
 633       a->activate_handler = g_signal_connect (w, "activate",
 634                                               G_CALLBACK (item_activated), NULL);
 635
 636       if (type == NULL)
 637         {
 638           /* all set */
 639         }
 640       else if (g_variant_type_equal (type, G_VARIANT_TYPE_BOOLEAN))
 641         {
 642           s = g_strconcat ("action-state-changed::", action, NULL);
 643           a->state_changed_id = g_signal_connect (group, s,
 644                                                   G_CALLBACK (toggle_state_changed), w);
 645           g_free (s);
 646           v = g_action_group_get_action_state (group, action);
 647           gtk_check_menu_item_set_active (GTK_CHECK_MENU_ITEM (w),
 648                                           g_variant_get_boolean (v));
 649           g_variant_unref (v);
 650         }
 651       else if (g_variant_type_equal (type, G_VARIANT_TYPE_STRING))
 652         {
 653           s = g_strconcat ("action-state-changed::", action, NULL);
 654           a->state_changed_id = g_signal_connect (group, s,
 655                                                   G_CALLBACK (radio_state_changed), w);
 656           g_free (s);
 657           g_menu_model_get_item_attribute (model, item, G_MENU_ATTRIBUTE_TARGET, "s", &target);
 658           a->target = g_strdup (target);
 659           v = g_action_group_get_action_state (group, action);
 660           gtk_check_menu_item_set_active (GTK_CHECK_MENU_ITEM (w),
 661                                           g_strcmp0 (g_variant_get_string (v, NULL), target) == 0);
 662           g_variant_unref (v);
 663           g_free (target);
 664         }
 665       else
 666         g_assert_not_reached ();
 667     }
 668
 669   g_free (label);
 670   g_free (action);
 671
 672   return w;
 673 }
 674
 675 static void populate_menu_from_model (GtkMenuShell *menu,
 676                                       GMenuModel   *model,
 677                                       GActionGroup *group);
 678
 679 static void
 680 append_items_from_model (GtkMenuShell *menu,
 681                          GMenuModel   *model,
 682                          GActionGroup *group,
 683                          gboolean     *need_separator,
 684                          const gchar  *heading)
 685 {
 686   gint n;
 687   gint i;
 688   GtkWidget *w;
 689   GtkWidget *menuitem;
 690   GtkWidget *submenu;
 691   GMenuModel *m;
 692   gchar *label;
 693
 694   n = g_menu_model_get_n_items (model);
 695
 696   if (*need_separator && n > 0)
 697     {
 698       w = gtk_separator_menu_item_new ();
 699       gtk_widget_show (w);
 700       gtk_menu_shell_append (menu, w);
 701       *need_separator = FALSE;
 702     }
 703
 704   if (heading != NULL)
 705     {
 706       w = gtk_menu_item_new_with_label (heading);
 707       gtk_widget_show (w);
 708       gtk_widget_set_sensitive (w, FALSE);
 709       gtk_menu_shell_append (GTK_MENU_SHELL (menu), w);
 710     }
 711
 712   for (i = 0; i < n; i++)
 713     {
 714       if ((m = g_menu_model_get_item_link (model, i, G_MENU_LINK_SECTION)))
 715         {
 716           label = NULL;
 717           g_menu_model_get_item_attribute (model, i, G_MENU_ATTRIBUTE_LABEL, "s", &label);
 718           append_items_from_model (menu, m, group, need_separator, label);
 719           g_object_unref (m);
 720           g_free (label);
 721           continue;
 722         }
 723
 724       if (*need_separator)
 725         {
 726           w = gtk_separator_menu_item_new ();
 727           gtk_widget_show (w);
 728           gtk_menu_shell_append (menu, w);
 729           *need_separator = FALSE;
 730         }
 731
 732       menuitem = create_menuitem_from_model (model, i, group);
 733
 734       if ((m = g_menu_model_get_item_link (model, i, G_MENU_LINK_SUBMENU)))
 735         {
 736           submenu = gtk_menu_new ();
 737           populate_menu_from_model (GTK_MENU_SHELL (submenu), m, group);
 738           gtk_menu_item_set_submenu (GTK_MENU_ITEM (menuitem), submenu);
 739           g_object_unref (m);
 740         }
 741
 742       gtk_widget_show (menuitem);
 743       gtk_menu_shell_append (menu, menuitem);
 744
 745       *need_separator = TRUE;
 746     }
 747 }
 748
 749 static void
 750 populate_menu_from_model (GtkMenuShell *menu,
 751                           GMenuModel   *model,
 752                           GActionGroup *group)
 753 {
 754   gboolean need_separator;
 755
 756   need_separator = FALSE;
 757   append_items_from_model (menu, model, group, &need_separator, NULL);
 758 }
 759
 760 typedef struct {
 761   GtkApplication *application;
 762   GtkMenuShell   *menu;
 763   guint           update_idle;
 764   GHashTable     *connected;
 765 } ItemsChangedData;
 766
 767 static void
 768 free_items_changed_data (gpointer data)
 769 {
 770   ItemsChangedData *d = data;
 771
 772   g_object_unref (d->application);
 773
 774   if (d->update_idle != 0)
 775     g_source_remove (d->update_idle);
 776
 777   g_hash_table_unref (d->connected);
 778
 779   g_free (d);
 780 }
 781
 782 static gboolean
 783 repopulate_menu (gpointer data)
 784 {
 785   ItemsChangedData *d = data;
 786   GList *children, *l;
 787   GtkWidget *child;
 788   GMenuModel *model;
 789
 790   /* remove current children */
 791   children = gtk_container_get_children (GTK_CONTAINER (d->menu));
 792   for (l = children; l; l = l->next)
 793     {
 794       child = l->data;
 795       gtk_container_remove (GTK_CONTAINER (d->menu), child);
 796     }
 797   g_list_free (children);
 798
 799   /* repopulate */
 800   model = g_application_get_menu (G_APPLICATION (d->application));
 801   populate_menu_from_model (d->menu, model, G_ACTION_GROUP (d->application));
 802
 803   d->update_idle = 0;
 804
 805   return FALSE;
 806 }
 807
 808 static void
 809 connect_to_items_changed (GMenuModel *model,
 810                           GCallback   callback,
 811                           gpointer    data)
 812 {
 813   ItemsChangedData *d = data;
 814   gint i;
 815   GMenuModel *m;
 816   GMenuLinkIter *iter;
 817
 818   if (!g_hash_table_lookup (d->connected, model))
 819     {
 820       g_signal_connect (model, "items-changed", callback, data);
 821       g_hash_table_insert (d->connected, model, model);
 822     }
 823
 824   for (i = 0; i < g_menu_model_get_n_items (model); i++)
 825     {
 826       iter = g_menu_model_iterate_item_links (model, i);
 827       while (g_menu_link_iter_next (iter))
 828         {
 829           m = g_menu_link_iter_get_value (iter);
 830           connect_to_items_changed (m, callback, data);
 831           g_object_unref (m);
 832         }
 833       g_object_unref (iter);
 834     }
 835 }
 836
 837 static void
 838 items_changed (GMenuModel *model,
 839                gint        position,
 840                gint        removed,
 841                gint        added,
 842                gpointer    data)
 843 {
 844   ItemsChangedData *d = data;
 845
 846   if (d->update_idle == 0)
 847     d->update_idle = gdk_threads_add_idle (repopulate_menu, data);
 848   connect_to_items_changed (model, G_CALLBACK (items_changed), data);
 849 }
 850
 851 /**
 852  * gtk_application_window_get_app_menu:
 853  * @window: a #GtkApplicationWindow
 854  *
 855  * Populates a menu widget from a menu model that is
 856  * associated with @window. See g_application_set_menu().
 857  * The menu items will be connected to actions of @window or
 858  * its associated #GtkApplication, as indicated by the menu model.
 859  * The menus contents will be updated automatically in response
 860  * to menu model changes.
 861  *
 862  * It is the callers responsibility to add the menu at a
 863  * suitable place in the widget hierarchy.
 864  *
 865  * This function returns %NULL if @window has no associated
 866  * menu model.
 867  *
 868  * @menu may be a #GtkMenu or a #GtkMenuBar.
 869  *
 870  * Returns: A #GtkMenu that has been populated from the
 871  *     #GMenuModel that is associated with @window, or %NULL
 872  */
 873 GtkWidget *
 874 gtk_application_window_get_app_menu (GtkApplicationWindow *window)
 875 {
 876   GtkApplication *application;
 877   GtkWidget *menu;
 878   GMenuModel *model;
 879   ItemsChangedData *data;
 880   GActionMuxer *muxer;
 881
 882   application = gtk_window_get_application (GTK_WINDOW (window));
 883
 884   model = g_application_get_menu (G_APPLICATION (application));
 885
 886   if (!model)
 887     return NULL;
 888
 889   menu = gtk_menu_new ();
 890
 891   muxer = g_action_muxer_new ();
 892   g_action_muxer_insert (muxer, "app", G_ACTION_GROUP (application));
 893   g_action_muxer_insert (muxer, "win", G_ACTION_GROUP (window));
 894   populate_menu_from_model (GTK_MENU_SHELL (menu), model, G_ACTION_GROUP (muxer));
 895   g_object_unref (muxer);
 896
 897   data = g_new (ItemsChangedData, 1);
 898   data->application = g_object_ref (application);
 899   data->menu = GTK_MENU_SHELL (menu);
 900   data->update_idle = 0;
 901   data->connected = g_hash_table_new (NULL, NULL);
 902
 903   g_object_set_data_full (G_OBJECT (menu), "gtk-application-menu-data",
 904                           data, free_items_changed_data);
 905
 906   connect_to_items_changed (model, G_CALLBACK (items_changed), data);
 907
 908   return menu;
 909 }