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

   1 /*
   2  * Copyright © 2011 Red Hat, Inc.
   3  * Copyright © 2011 Canonical Limited
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the licence, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General Public
  16  * License along with this library; if not, write to the
  17  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18  * Boston, MA 02111-1307, USA.
  19  *
  20  * Author: Matthias Clasen <mclasen@redhat.com>
  21  *         Ryan Lortie <desrt@desrt.ca>
  22  */
  23
  24 #include "config.h"
  25
  26 #include "gtkmodelmenu.h"
  27
  28 #include "gtkmenu.h"
  29 #include "gtkmenubar.h"
  30 #include "gtkseparatormenuitem.h"
  31 #include "gtkmodelmenuitem.h"
  32
  33 typedef struct {
  34   GActionObservable *actions;
  35   GMenuModel        *model;
  36   GtkAccelGroup     *accels;
  37   GtkMenuShell      *shell;
  38   guint              update_idle;
  39   GSList            *connected;
  40   gboolean           with_separators;
  41   gint               n_items;
  42 } GtkModelMenuBinding;
  43
  44 static void
  45 gtk_model_menu_binding_items_changed (GMenuModel *model,
  46                                       gint        position,
  47                                       gint        removed,
  48                                       gint        added,
  49                                       gpointer    user_data);
  50 static void gtk_model_menu_binding_append_model (GtkModelMenuBinding *binding,
  51                                                  GMenuModel *model,
  52                                                  gboolean with_separators);
  53
  54 static void
  55 gtk_model_menu_binding_free (gpointer data)
  56 {
  57   GtkModelMenuBinding *binding = data;
  58
  59   /* disconnect all existing signal handlers */
  60   while (binding->connected)
  61     {
  62       g_signal_handlers_disconnect_by_func (binding->connected->data, gtk_model_menu_binding_items_changed, binding);
  63       g_object_unref (binding->connected->data);
  64
  65       binding->connected = g_slist_delete_link (binding->connected, binding->connected);
  66     }
  67
  68   g_object_unref (binding->actions);
  69   g_object_unref (binding->model);
  70
  71   g_slice_free (GtkModelMenuBinding, binding);
  72 }
  73
  74 static void
  75 gtk_model_menu_binding_append_item (GtkModelMenuBinding  *binding,
  76                                     GMenuModel           *model,
  77                                     gint                  item_index,
  78                                     gchar               **heading)
  79 {
  80   GMenuModel *section;
  81
  82   if ((section = g_menu_model_get_item_link (model, item_index, "section")))
  83     {
  84       g_menu_model_get_item_attribute (model, item_index, "label", "s", heading);
  85       gtk_model_menu_binding_append_model (binding, section, FALSE);
  86     }
  87   else
  88     {
  89       GtkMenuItem *item;
  90
  91       item = gtk_model_menu_item_new (model, item_index, binding->actions, binding->accels);
  92       gtk_menu_shell_append (binding->shell, GTK_WIDGET (item));
  93       gtk_widget_show (GTK_WIDGET (item));
  94       binding->n_items++;
  95     }
  96 }
  97
  98 static void
  99 gtk_model_menu_binding_append_model (GtkModelMenuBinding *binding,
 100                                      GMenuModel          *model,
 101                                      gboolean             with_separators)
 102 {
 103   gint n, i;
 104
 105   g_signal_connect (model, "items-changed", G_CALLBACK (gtk_model_menu_binding_items_changed), binding);
 106   binding->connected = g_slist_prepend (binding->connected, g_object_ref (model));
 107
 108   /* Deciding if we should show a separator is a bit difficult.  There
 109    * are two types of separators:
 110    *
 111    *  - section headings (when sections have 'label' property)
 112    *
 113    *  - normal separators automatically put between sections
 114    *
 115    * The easiest way to think about it is that a section usually has a
 116    * separator (or heading) immediately before it.
 117    *
 118    * There are three exceptions to this general rule:
 119    *
 120    *  - empty sections don't get separators or headings
 121    *
 122    *  - sections only get separators and headings at the toplevel of a
 123    *    menu (ie: no separators on nested sections or in menubars)
 124    *
 125    *  - the first section in the menu doesn't get a normal separator,
 126    *    but it can get a header (if it's not empty)
 127    *
 128    * Unfortunately, we cannot simply check the size of the section in
 129    * order to determine if we should place a header: the section may
 130    * contain other sections that are themselves empty.  Instead, we need
 131    * to append the section, and check if we ended up with any actual
 132    * content.  If we did, then we need to insert before that content.
 133    * We use 'our_position' to keep track of this.
 134    */
 135
 136   n = g_menu_model_get_n_items (model);
 137
 138   for (i = 0; i < n; i++)
 139     {
 140       gint our_position = binding->n_items;
 141       gchar *heading = NULL;
 142
 143       gtk_model_menu_binding_append_item (binding, model, i, &heading);
 144
 145       if (with_separators && our_position < binding->n_items)
 146         {
 147           GtkWidget *separator = NULL;
 148
 149           if (heading)
 150             {
 151               separator = gtk_menu_item_new_with_label (heading);
 152               gtk_widget_set_sensitive (separator, FALSE);
 153             }
 154           else if (our_position > 0)
 155             separator = gtk_separator_menu_item_new ();
 156
 157           if (separator)
 158             {
 159               gtk_menu_shell_insert (binding->shell, separator, our_position);
 160               gtk_widget_show (separator);
 161               binding->n_items++;
 162             }
 163         }
 164
 165       g_free (heading);
 166     }
 167 }
 168
 169 static void
 170 gtk_model_menu_binding_populate (GtkModelMenuBinding *binding)
 171 {
 172   GList *children;
 173
 174   /* remove current children */
 175   children = gtk_container_get_children (GTK_CONTAINER (binding->shell));
 176   while (children)
 177     {
 178       gtk_container_remove (GTK_CONTAINER (binding->shell), children->data);
 179       children = g_list_delete_link (children, children);
 180     }
 181
 182   binding->n_items = 0;
 183
 184   /* add new items from the model */
 185   gtk_model_menu_binding_append_model (binding, binding->model, binding->with_separators);
 186 }
 187
 188 static gboolean
 189 gtk_model_menu_binding_handle_changes (gpointer user_data)
 190 {
 191   GtkModelMenuBinding *binding = user_data;
 192
 193   /* disconnect all existing signal handlers */
 194   while (binding->connected)
 195     {
 196       g_signal_handlers_disconnect_by_func (binding->connected->data, gtk_model_menu_binding_items_changed, binding);
 197       g_object_unref (binding->connected->data);
 198
 199       binding->connected = g_slist_delete_link (binding->connected, binding->connected);
 200     }
 201
 202   gtk_model_menu_binding_populate (binding);
 203
 204   binding->update_idle = 0;
 205
 206   g_object_unref (binding->shell);
 207
 208   return G_SOURCE_REMOVE;
 209 }
 210
 211 static void
 212 gtk_model_menu_binding_items_changed (GMenuModel *model,
 213                                       gint        position,
 214                                       gint        removed,
 215                                       gint        added,
 216                                       gpointer    user_data)
 217 {
 218   GtkModelMenuBinding *binding = user_data;
 219
 220   if (binding->update_idle == 0)
 221     {
 222       binding->update_idle = gdk_threads_add_idle (gtk_model_menu_binding_handle_changes, user_data);
 223       g_object_ref (binding->shell);
 224     }
 225 }
 226
 227 void
 228 gtk_model_menu_bind (GtkMenuShell      *shell,
 229                      GMenuModel        *model,
 230                      GActionObservable *actions,
 231                      GtkAccelGroup     *accels,
 232                      gboolean           with_separators)
 233 {
 234   GtkModelMenuBinding *binding;
 235
 236   binding = g_slice_new (GtkModelMenuBinding);
 237   binding->model = g_object_ref (model);
 238   binding->actions = g_object_ref (actions);
 239   binding->accels = accels;
 240   binding->shell = shell;
 241   binding->update_idle = 0;
 242   binding->connected = NULL;
 243   binding->with_separators = with_separators;
 244
 245   g_object_set_data_full (G_OBJECT (shell), "gtk-model-menu-binding", binding, gtk_model_menu_binding_free);
 246   gtk_model_menu_binding_populate (binding);
 247 }
 248
 249 GtkWidget *
 250 gtk_model_menu_create_menu (GMenuModel        *model,
 251                             GActionObservable *actions,
 252                             GtkAccelGroup     *accels)
 253 {
 254   GtkWidget *menu;
 255
 256   menu = gtk_menu_new ();
 257   gtk_menu_set_accel_group (GTK_MENU (menu), accels);
 258   gtk_model_menu_bind (GTK_MENU_SHELL (menu), model, actions, accels, TRUE);
 259
 260   return menu;
 261 }
 262
 263 GtkWidget *
 264 gtk_model_menu_create_menu_bar (GMenuModel        *model,
 265                                 GActionObservable *actions,
 266                                 GtkAccelGroup     *accels)
 267 {
 268   GtkWidget *menubar;
 269
 270   menubar = gtk_menu_bar_new ();
 271   gtk_model_menu_bind (GTK_MENU_SHELL (menubar), model, actions, accels, FALSE);
 272
 273   return menubar;
 274 }
 275