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/*
 * e-shell-window.c
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) version 3.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with the program; if not, see <http://www.gnu.org/licenses/>
 *
 *
 * Copyright (C) 1999-2008 Novell, Inc. (www.novell.com)
 *
 */

/**
 * SECTION: e-shell-window
 * @short_description: the main window
 * @include: shell/e-shell-window.h
 **/

#include "e-shell-window-private.h"

#include <gconf/gconf-client.h>

#include <e-util/e-extensible.h>
#include <e-util/e-plugin-ui.h>
#include <e-util/e-util-private.h>

enum {
    PROP_0,
    PROP_ACTIVE_VIEW,
    PROP_FOCUS_TRACKER,
    PROP_GEOMETRY,
    PROP_SAFE_MODE,
    PROP_SHELL,
    PROP_SIDEBAR_VISIBLE,
    PROP_SWITCHER_VISIBLE,
    PROP_TASKBAR_VISIBLE,
    PROP_TOOLBAR_VISIBLE,
    PROP_UI_MANAGER
};

enum {
    SHELL_VIEW_CREATED,
    LAST_SIGNAL
};

static gulong signals[LAST_SIGNAL];

G_DEFINE_TYPE_WITH_CODE (
    EShellWindow, e_shell_window, GTK_TYPE_WINDOW,
    G_IMPLEMENT_INTERFACE (E_TYPE_EXTENSIBLE, NULL))

static void
shell_window_menubar_update_new_menu (EShellWindow *shell_window)
{
    GtkWidget *menu;
    GtkWidget *widget;
    const gchar *path;

    /* Update the "File -> New" submenu. */
    path = "/main-menu/file-menu/new-menu";
    menu = e_shell_window_create_new_menu (shell_window);
    widget = e_shell_window_get_managed_widget (shell_window, path);
    gtk_menu_item_set_submenu (GTK_MENU_ITEM (widget), menu);
    gtk_widget_show (widget);
}

static void
shell_window_toolbar_update_new_menu (EShellWindow *shell_window,
                                      GParamSpec *pspec,
                                      GtkMenuToolButton *menu_tool_button)
{
    GtkWidget *menu;

    /* Update the "New" menu tool button submenu. */
    menu = e_shell_window_create_new_menu (shell_window);
    gtk_menu_tool_button_set_menu (menu_tool_button, menu);
}

static void
shell_window_set_notebook_page (EShellWindow *shell_window,
                                GParamSpec *pspec,
                                GtkNotebook *notebook)
{
    EShellView *shell_view;
    const gchar *view_name;
    gint page_num;

    view_name = e_shell_window_get_active_view (shell_window);
    shell_view = e_shell_window_get_shell_view (shell_window, view_name);

    page_num = e_shell_view_get_page_num (shell_view);
    g_return_if_fail (page_num >= 0);

    gtk_notebook_set_current_page (notebook, page_num);
}

static void
shell_window_online_button_clicked_cb (EOnlineButton *button,
                                       EShellWindow *shell_window)
{
    if (e_online_button_get_online (button))
        gtk_action_activate (ACTION (WORK_OFFLINE));
    else
        gtk_action_activate (ACTION (WORK_ONLINE));
}

static void
shell_window_update_close_action_cb (EShellWindow *shell_window)
{
    EShell *shell;
    GList *watched_windows;
    gint n_shell_windows = 0;

    shell = e_shell_window_get_shell (shell_window);
    watched_windows = e_shell_get_watched_windows (shell);

    /* Count the shell windows. */
    while (watched_windows != NULL) {
        if (E_IS_SHELL_WINDOW (watched_windows->data))
            n_shell_windows++;
        watched_windows = g_list_next (watched_windows);
    }

    /* Disable Close Window if there's only one shell window.
     * Helps prevent users from accidentally quitting. */
    gtk_action_set_sensitive (ACTION (CLOSE), n_shell_windows > 1);
}

static void
shell_window_set_geometry (EShellWindow *shell_window,
                           const gchar *geometry)
{
    g_return_if_fail (shell_window->priv->geometry == NULL);

    shell_window->priv->geometry = g_strdup (geometry);
}

static void
shell_window_set_shell (EShellWindow *shell_window,
                        EShell *shell)
{
    GArray *array;
    gulong handler_id;

    g_return_if_fail (shell_window->priv->shell == NULL);

    shell_window->priv->shell = shell;

    g_object_add_weak_pointer (
        G_OBJECT (shell), &shell_window->priv->shell);

    /* Need to disconnect these when the window is closing. */

    array = shell_window->priv->signal_handler_ids;

    handler_id = g_signal_connect_swapped (
        shell, "window-created",
        G_CALLBACK (shell_window_update_close_action_cb),
        shell_window);

    g_array_append_val (array, handler_id);

    handler_id = g_signal_connect_swapped (
        shell, "window-destroyed",
        G_CALLBACK (shell_window_update_close_action_cb),
        shell_window);

    g_array_append_val (array, handler_id);

    g_object_notify (G_OBJECT (shell), "online");
}

static void
shell_window_set_property (GObject *object,
                           guint property_id,
               const GValue *value,
               GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_ACTIVE_VIEW:
            e_shell_window_set_active_view (
                E_SHELL_WINDOW (object),
                g_value_get_string (value));
            return;

        case PROP_GEOMETRY:
            shell_window_set_geometry (
                E_SHELL_WINDOW (object),
                g_value_get_string (value));
            return;

        case PROP_SAFE_MODE:
            e_shell_window_set_safe_mode (
                E_SHELL_WINDOW (object),
                g_value_get_boolean (value));
            return;

        case PROP_SHELL:
            shell_window_set_shell (
                E_SHELL_WINDOW (object),
                g_value_get_object (value));
            return;

        case PROP_SIDEBAR_VISIBLE:
            e_shell_window_set_sidebar_visible (
                E_SHELL_WINDOW (object),
                g_value_get_boolean (value));
            return;

        case PROP_SWITCHER_VISIBLE:
            e_shell_window_set_switcher_visible (
                E_SHELL_WINDOW (object),
                g_value_get_boolean (value));
            return;

        case PROP_TASKBAR_VISIBLE:
            e_shell_window_set_taskbar_visible (
                E_SHELL_WINDOW (object),
                g_value_get_boolean (value));
            return;

        case PROP_TOOLBAR_VISIBLE:
            e_shell_window_set_toolbar_visible (
                E_SHELL_WINDOW (object),
                g_value_get_boolean (value));
            return;
    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
shell_window_get_property (GObject *object,
                           guint property_id,
               GValue *value,
               GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_ACTIVE_VIEW:
            g_value_set_string (
                value, e_shell_window_get_active_view (
                E_SHELL_WINDOW (object)));
            return;

        case PROP_FOCUS_TRACKER:
            g_value_set_object (
                value, e_shell_window_get_focus_tracker (
                E_SHELL_WINDOW (object)));
            return;

        case PROP_SAFE_MODE:
            g_value_set_boolean (
                value, e_shell_window_get_safe_mode (
                E_SHELL_WINDOW (object)));
            return;

        case PROP_SHELL:
            g_value_set_object (
                value, e_shell_window_get_shell (
                E_SHELL_WINDOW (object)));
            return;

        case PROP_SIDEBAR_VISIBLE:
            g_value_set_boolean (
                value, e_shell_window_get_sidebar_visible (
                E_SHELL_WINDOW (object)));
            return;

        case PROP_SWITCHER_VISIBLE:
            g_value_set_boolean (
                value, e_shell_window_get_switcher_visible (
                E_SHELL_WINDOW (object)));
            return;

        case PROP_TASKBAR_VISIBLE:
            g_value_set_boolean (
                value, e_shell_window_get_taskbar_visible (
                E_SHELL_WINDOW (object)));
            return;

        case PROP_TOOLBAR_VISIBLE:
            g_value_set_boolean (
                value, e_shell_window_get_toolbar_visible (
                E_SHELL_WINDOW (object)));
            return;

        case PROP_UI_MANAGER:
            g_value_set_object (
                value, e_shell_window_get_ui_manager (
                E_SHELL_WINDOW (object)));
            return;
    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
shell_window_dispose (GObject *object)
{
    e_shell_window_private_dispose (E_SHELL_WINDOW (object));

    /* Chain up to parent's dispose() method. */
    G_OBJECT_CLASS (e_shell_window_parent_class)->dispose (object);
}

static void
shell_window_finalize (GObject *object)
{
    e_shell_window_private_finalize (E_SHELL_WINDOW (object));

    /* Chain up to parent's finalize() method. */
    G_OBJECT_CLASS (e_shell_window_parent_class)->finalize (object);
}

static void
shell_window_constructed (GObject *object)
{
    EShellWindow *shell_window = E_SHELL_WINDOW (object);

    e_shell_window_private_constructed (shell_window);

    e_extensible_load_extensions (E_EXTENSIBLE (object));

    if (e_shell_get_meego_mode (shell_window->priv->shell) &&
        e_shell_get_small_screen_mode (shell_window->priv->shell))
        gtk_window_set_decorated (GTK_WINDOW (object), FALSE);
}

static GtkWidget *
shell_window_construct_menubar (EShellWindow *shell_window)
{
    GtkWidget *main_menu;

    main_menu = e_shell_window_get_managed_widget (
        shell_window, "/main-menu");
    gtk_widget_show (main_menu);

    if (e_shell_get_small_screen_mode (shell_window->priv->shell)) {
        GtkWidget *parent, *child;

        parent = gtk_widget_get_parent (main_menu);
        g_object_ref (parent);
        gtk_container_remove ((GtkContainer *)parent, main_menu);
        child = gtk_hbox_new (FALSE, 0);
        gtk_box_pack_start ((GtkBox *)child, main_menu, TRUE, TRUE, 0);
        gtk_widget_show (child);
        gtk_container_add ((GtkContainer *)parent, child);
        shell_window->priv->menubar_box = child;

        e_mutual_binding_new (main_menu, "visible",
                child, "visible");
        main_menu = child;
    }

    g_signal_connect (
        shell_window, "notify::active-view",
        G_CALLBACK (shell_window_menubar_update_new_menu), NULL);

    return main_menu;
}

GtkWidget *
e_shell_window_get_menu_bar_box (EShellWindow *shell_window)
{
    return shell_window->priv->menubar_box;
}

static GtkWidget *
shell_window_construct_toolbar (EShellWindow *shell_window)
{
    EShell *shell;
    GtkUIManager *ui_manager;
    GtkWidget *toolbar;
    GtkWidget *box;
    GtkToolItem *item;

    shell = e_shell_window_get_shell (shell_window);
    ui_manager = e_shell_window_get_ui_manager (shell_window);

    box = gtk_hbox_new (FALSE, 0);
    gtk_widget_show (box);

    e_binding_new (
        shell_window, "toolbar-visible",
        box, "visible");

    toolbar = e_shell_window_get_managed_widget (
        shell_window, "/main-toolbar");

    if (e_shell_get_meego_mode (shell))
         gtk_widget_set_name (GTK_WIDGET (toolbar), "MeeGoToolbar");

    /* XXX Having this separator in the UI definition doesn't work
     *     because GtkUIManager is unaware of the "New" button, so
     *     it makes the separator invisible.  One possibility is to
     *     define a GtkAction subclass for which create_tool_item()
     *     return an EMenuToolButton.  Then both this separator
     *     and the "New" button could be added to the UI definition.
     *     Tempting, but the "New" button and its dynamically
     *     generated menu is already a complex beast, and I'm not
     *     convinced having it proxy some new type of GtkAction
     *     is worth the extra effort. */
    item = gtk_separator_tool_item_new ();
    gtk_toolbar_insert (GTK_TOOLBAR (toolbar), item, 0);
    gtk_widget_show (GTK_WIDGET (item));

    item = e_menu_tool_button_new (_("New"));
    gtk_tool_item_set_is_important (GTK_TOOL_ITEM (item), TRUE);
    gtk_widget_add_accelerator (
        GTK_WIDGET (item), "clicked",
        gtk_ui_manager_get_accel_group (ui_manager),
        GDK_N, GDK_CONTROL_MASK, GTK_ACCEL_VISIBLE);
    gtk_toolbar_insert (GTK_TOOLBAR (toolbar), item, 0);
    gtk_widget_show (GTK_WIDGET (item));

    g_signal_connect (
        shell_window, "notify::active-view",
        G_CALLBACK (shell_window_toolbar_update_new_menu),
        GTK_MENU_TOOL_BUTTON (item));

    gtk_box_pack_start (GTK_BOX (box), toolbar, TRUE, TRUE, 0);

    toolbar = e_shell_window_get_managed_widget (
        shell_window, "/search-toolbar");
    gtk_toolbar_set_show_arrow (GTK_TOOLBAR (toolbar), FALSE);
    if (e_shell_get_express_mode (shell))
        gtk_box_pack_start (GTK_BOX (box), toolbar, FALSE, FALSE, 0);
    if (e_shell_get_meego_mode (shell))
        gtk_widget_set_name (GTK_WIDGET (toolbar), "MeeGoToolbar");

    toolbar = e_shell_window_get_managed_widget (
        shell_window, "/close-toolbar");
    gtk_toolbar_set_show_arrow (GTK_TOOLBAR (toolbar), FALSE);
    if (e_shell_get_meego_mode (shell))
        gtk_box_pack_start (GTK_BOX (box), toolbar, FALSE, FALSE, 0);
    if (e_shell_get_meego_mode (shell))
        gtk_widget_set_name (GTK_WIDGET (toolbar), "MeeGoToolbar");

    return box;
}

static GtkWidget *
shell_window_construct_sidebar (EShellWindow *shell_window)
{
    GtkWidget *notebook;
    GtkWidget *switcher;

    switcher = e_shell_switcher_new ();
    shell_window->priv->switcher = g_object_ref_sink (switcher);

    e_binding_new (
        shell_window, "sidebar-visible",
        switcher, "visible");

    e_binding_new (
        shell_window, "switcher-visible",
        switcher, "toolbar-visible");

    notebook = gtk_notebook_new ();
    gtk_notebook_set_show_tabs (GTK_NOTEBOOK (notebook), FALSE);
    gtk_notebook_set_show_border (GTK_NOTEBOOK (notebook), FALSE);
    gtk_container_add (GTK_CONTAINER (switcher), notebook);
    shell_window->priv->sidebar_notebook = g_object_ref (notebook);
    gtk_widget_show (notebook);

    g_signal_connect (
        shell_window, "notify::active-view",
        G_CALLBACK (shell_window_set_notebook_page), notebook);

    return switcher;
}

static GtkWidget *
shell_window_construct_content (EShellWindow *shell_window)
{
    GtkWidget *notebook;

    notebook = gtk_notebook_new ();
    gtk_notebook_set_show_tabs (GTK_NOTEBOOK (notebook), FALSE);
    gtk_notebook_set_show_border (GTK_NOTEBOOK (notebook), FALSE);
    shell_window->priv->content_notebook = g_object_ref_sink (notebook);
    gtk_widget_show (notebook);

    g_signal_connect (
        shell_window, "notify::active-view",
        G_CALLBACK (shell_window_set_notebook_page), notebook);

    return notebook;
}

static GtkWidget *
shell_window_construct_taskbar (EShellWindow *shell_window)
{
    EShell *shell;
    GtkWidget *notebook;
    GtkWidget *status_area;
    GtkWidget *online_button;
    GtkWidget *tooltip_label;
    gint height;

    shell = e_shell_window_get_shell (shell_window);

    status_area = gtk_hbox_new (FALSE, 3);
    gtk_container_set_border_width (GTK_CONTAINER (status_area), 3);

    e_binding_new (
        shell_window, "taskbar-visible",
        status_area, "visible");

    /* Make the status area as large as the task bar. */
    gtk_icon_size_lookup (GTK_ICON_SIZE_MENU, NULL, &height);
    gtk_widget_set_size_request (status_area, -1, (height * 2) + 6);

    online_button = e_online_button_new ();
    gtk_box_pack_start (
        GTK_BOX (status_area), online_button, FALSE, TRUE, 0);
    gtk_widget_show (online_button);

    e_binding_new (
        shell, "online",
        online_button, "online");

    e_binding_new (
        shell, "network-available",
        online_button, "sensitive");

    g_signal_connect (
        online_button, "clicked",
        G_CALLBACK (shell_window_online_button_clicked_cb),
        shell_window);

    tooltip_label = gtk_label_new ("");
    gtk_misc_set_alignment (GTK_MISC (tooltip_label), 0.0, 0.5);
    gtk_box_pack_start (
        GTK_BOX (status_area), tooltip_label, TRUE, TRUE, 0);
    shell_window->priv->tooltip_label = g_object_ref (tooltip_label);
    gtk_widget_hide (tooltip_label);

    notebook = gtk_notebook_new ();
    gtk_notebook_set_show_tabs (GTK_NOTEBOOK (notebook), FALSE);
    gtk_notebook_set_show_border (GTK_NOTEBOOK (notebook), FALSE);
    gtk_box_pack_start (GTK_BOX (status_area), notebook, TRUE, TRUE, 0);
    shell_window->priv->status_notebook = g_object_ref (notebook);
    gtk_widget_show (notebook);

    g_signal_connect (
        shell_window, "notify::active-view",
        G_CALLBACK (shell_window_set_notebook_page), notebook);

    return status_area;
}

static EShellView *
shell_window_create_shell_view (EShellWindow *shell_window,
                                const gchar *view_name)
{
    EShell *shell;
    EShellView *shell_view;
    EShellBackend *shell_backend;
    GHashTable *loaded_views;
    GtkUIManager *ui_manager;
    GtkNotebook *notebook;
    GtkAction *action;
    GtkWidget *widget;
    const gchar *name;
    const gchar *id;
    gint page_num;
    GType type;

    shell = e_shell_window_get_shell (shell_window);
    shell_backend = e_shell_get_backend_by_name (shell, view_name);

    if (shell_backend == NULL) {
        g_critical ("Unknown shell view name: %s", view_name);
        return NULL;
    }

    name = E_SHELL_BACKEND_GET_CLASS (shell_backend)->name;
    type = E_SHELL_BACKEND_GET_CLASS (shell_backend)->shell_view_type;

    /* First off, start the shell backend. */
    e_shell_backend_start (shell_backend);

    /* Determine the page number for the new shell view. */
    notebook = GTK_NOTEBOOK (shell_window->priv->content_notebook);
    page_num = gtk_notebook_get_n_pages (notebook);

    /* Get the switcher action for this view. */
    action = e_shell_window_get_shell_view_action (shell_window, name);

    /* Create the shell view. */
    shell_view = g_object_new (
        type, "action", action, "page-num", page_num,
        "shell-window", shell_window, NULL);

    /* Register the shell view. */
    loaded_views = shell_window->priv->loaded_views;
    g_hash_table_insert (loaded_views, g_strdup (name), shell_view);

    /* Register the GtkUIManager ID for the shell view. */
    id = E_SHELL_VIEW_GET_CLASS (shell_view)->ui_manager_id;
    ui_manager = e_shell_window_get_ui_manager (shell_window);
    e_plugin_ui_register_manager (ui_manager, id, shell_view);

    /* Add pages to the various shell window notebooks. */

    /* We can't determine the shell view's page number until after the
     * shell view is fully initialized because the shell view may load
     * other shell views during initialization, and those other shell
     * views will append their widgets to the notebooks before us. */
    page_num = gtk_notebook_get_n_pages (notebook);
    e_shell_view_set_page_num (shell_view, page_num);

    notebook = GTK_NOTEBOOK (shell_window->priv->content_notebook);
    widget = GTK_WIDGET (e_shell_view_get_shell_content (shell_view));
    gtk_notebook_append_page (notebook, widget, NULL);

    notebook = GTK_NOTEBOOK (shell_window->priv->sidebar_notebook);
    widget = GTK_WIDGET (e_shell_view_get_shell_sidebar (shell_view));
    gtk_notebook_append_page (notebook, widget, NULL);

    notebook = GTK_NOTEBOOK (shell_window->priv->status_notebook);
    widget = GTK_WIDGET (e_shell_view_get_shell_taskbar (shell_view));
    gtk_notebook_append_page (notebook, widget, NULL);

    /* Listen for changes that affect the shell window. */

    g_signal_connect_swapped (
        action, "notify::icon-name",
        G_CALLBACK (e_shell_window_update_icon), shell_window);

    g_signal_connect_swapped (
        shell_view, "notify::title",
        G_CALLBACK (e_shell_window_update_title), shell_window);

    g_signal_connect_swapped (
        shell_view, "notify::view-id",
        G_CALLBACK (e_shell_window_update_view_menu), shell_window);

    return shell_view;
}

static void
shell_window_realize (GtkWidget *widget)
{
    EShellWindow *shell_window;

    shell_window = E_SHELL_WINDOW (widget);
    e_shell_adapt_window_size (shell_window->priv->shell,
                   GTK_WINDOW (widget));

    /* Chain up to parent's dispose() method. */
    GTK_WIDGET_CLASS (e_shell_window_parent_class)->realize (widget);
}

static void
e_shell_window_class_init (EShellWindowClass *class)
{
    GObjectClass *object_class;
    GtkWidgetClass *widget_class;

    g_type_class_add_private (class, sizeof (EShellWindowPrivate));

    object_class = G_OBJECT_CLASS (class);
    object_class->set_property = shell_window_set_property;
    object_class->get_property = shell_window_get_property;
    object_class->dispose = shell_window_dispose;
    object_class->finalize = shell_window_finalize;
    object_class->constructed = shell_window_constructed;

    widget_class = GTK_WIDGET_CLASS (class);
    widget_class->realize = shell_window_realize;

    class->construct_menubar = shell_window_construct_menubar;
    class->construct_toolbar = shell_window_construct_toolbar;
    class->construct_sidebar = shell_window_construct_sidebar;
    class->construct_content = shell_window_construct_content;
    class->construct_taskbar = shell_window_construct_taskbar;
    class->create_shell_view = shell_window_create_shell_view;

    /**
     * EShellWindow:active-view
     *
     * Name of the active #EShellView.
     **/
    g_object_class_install_property (
        object_class,
        PROP_ACTIVE_VIEW,
        g_param_spec_string (
            "active-view",
            "Active Shell View",
            "Name of the active shell view",
            NULL,
            G_PARAM_READWRITE));

    /**
     * EShellWindow:focus-tracker
     *
     * The shell window's #EFocusTracker.
     **/
    g_object_class_install_property (
        object_class,
        PROP_FOCUS_TRACKER,
        g_param_spec_object (
            "focus-tracker",
            "Focus Tracker",
            "The shell window's EFocusTracker",
            E_TYPE_FOCUS_TRACKER,
            G_PARAM_READABLE));

    /**
     * EShellWindow:geometry
     *
     * User-specified initial window geometry string.
     **/
    g_object_class_install_property (
        object_class,
        PROP_GEOMETRY,
        g_param_spec_string (
            "geometry",
            "Geometry",
            "Initial window geometry string",
            NULL,
            G_PARAM_WRITABLE |
            G_PARAM_CONSTRUCT_ONLY));

    /**
     * EShellWindow:safe-mode
     *
     * Whether the shell window is in safe mode.
     **/
    g_object_class_install_property (
        object_class,
        PROP_SAFE_MODE,
        g_param_spec_boolean (
            "safe-mode",
            "Safe Mode",
            "Whether the shell window is in safe mode",
            FALSE,
            G_PARAM_READWRITE |
            G_PARAM_CONSTRUCT));

    /**
     * EShellWindow:shell
     *
     * The #EShell singleton.
     **/
    g_object_class_install_property (
        object_class,
        PROP_SHELL,
        g_param_spec_object (
            "shell",
            "Shell",
            "The EShell singleton",
            E_TYPE_SHELL,
            G_PARAM_READWRITE |
            G_PARAM_CONSTRUCT_ONLY));

    /**
     * EShellWindow:sidebar-visible
     *
     * Whether the shell window's side bar is visible.
     **/
    g_object_class_install_property (
        object_class,
        PROP_SIDEBAR_VISIBLE,
        g_param_spec_boolean (
            "sidebar-visible",
            "Sidebar Visible",
            "Whether the shell window's side bar is visible",
            TRUE,
            G_PARAM_READWRITE));

    /**
     * EShellWindow:switcher-visible
     *
     * Whether the shell window's switcher buttons are visible.
     **/
    g_object_class_install_property (
        object_class,
        PROP_SWITCHER_VISIBLE,
        g_param_spec_boolean (
            "switcher-visible",
            "Switcher Visible",
            "Whether the shell window's "
              "switcher buttons are visible",
            TRUE,
            G_PARAM_READWRITE));

    /**
     * EShellWindow:taskbar-visible
     *
     * Whether the shell window's task bar is visible.
     **/
    g_object_class_install_property (
        object_class,
        PROP_TASKBAR_VISIBLE,
        g_param_spec_boolean (
            "taskbar-visible",
            "Taskbar Visible",
            "Whether the shell window's task bar is visible",
            TRUE,
            G_PARAM_READWRITE));

    /**
     * EShellWindow:toolbar-visible
     *
     * Whether the shell window's tool bar is visible.
     **/
    g_object_class_install_property (
        object_class,
        PROP_TOOLBAR_VISIBLE,
        g_param_spec_boolean (
            "toolbar-visible",
            "Toolbar Visible",
            "Whether the shell window's tool bar is visible",
            TRUE,
            G_PARAM_READWRITE));

    /**
     * EShellWindow:ui-manager
     *
     * The shell window's #GtkUIManager.
     **/
    g_object_class_install_property (
        object_class,
        PROP_UI_MANAGER,
        g_param_spec_object (
            "ui-manager",
            "UI Manager",
            "The shell window's GtkUIManager",
            GTK_TYPE_UI_MANAGER,
            G_PARAM_READABLE));

    /**
     * EShellWindow::shell-view-created
     * @shell_window: the #EShellWindow which emitted the signal
     * @shell_view: the new #EShellView
     *
     * Emitted when a new #EShellView is instantiated by way of
     * e_shell_window_get_shell_view().  The signal detail denotes
     * the new view name, which can be used to obtain notification
     * of when a particular #EShellView is created.
     **/
    signals[SHELL_VIEW_CREATED] = g_signal_new (
        "shell-view-created",
        G_OBJECT_CLASS_TYPE (object_class),
        G_SIGNAL_RUN_LAST | G_SIGNAL_DETAILED,
        G_STRUCT_OFFSET (EShellWindowClass, shell_view_created),
        NULL, NULL,
        g_cclosure_marshal_VOID__OBJECT,
        G_TYPE_NONE, 1,
        E_TYPE_SHELL_VIEW);
}

static void
e_shell_window_init (EShellWindow *shell_window)
{
    shell_window->priv = E_SHELL_WINDOW_GET_PRIVATE (shell_window);

    e_shell_window_private_init (shell_window);
}

/**
 * e_shell_window_new:
 * @shell: an #EShell
 * @safe_mode: whether to initialize the window to "safe mode"
 * @geometry: initial window geometry string, or %NULL
 *
 * Returns a new #EShellWindow.
 *
 * It's up to the various #EShellView<!-- -->'s to define exactly
 * what "safe mode" means, but the #EShell usually puts the initial
 * #EShellWindow into "safe mode" if detects the previous Evolution
 * session crashed.
 *
 * The initial view for the window is determined by GConf key
 * <filename>/apps/evolution/shell/view_defaults/component_id</filename>.
 * Or, if the GConf key is not set or can't be read, the first view
 * in the switcher is used.
 *
 * Returns: a new #EShellWindow
 **/
GtkWidget *
e_shell_window_new (EShell *shell,
                    gboolean safe_mode,
                    const gchar *geometry)
{
    return g_object_new (
        E_TYPE_SHELL_WINDOW,
        "shell", shell, "geometry", geometry,
        "safe-mode", safe_mode, NULL);
}

/**
 * e_shell_window_get_shell:
 * @shell_window: an #EShellWindow
 *
 * Returns the #EShell that was passed to e_shell_window_new().
 *
 * Returns: the #EShell
 **/
EShell *
e_shell_window_get_shell (EShellWindow *shell_window)
{
    g_return_val_if_fail (E_IS_SHELL_WINDOW (shell_window), NULL);

    return E_SHELL (shell_window->priv->shell);
}

/**
 * e_shell_window_get_shell_view:
 * @shell_window: an #EShellWindow
 * @view_name: name of a shell view
 *
 * Returns the #EShellView named @view_name (see the
 * <structfield>name</structfield> field in #EShellBackendInfo).  This
 * will also instantiate the #EShellView the first time it's requested.
 * To reduce resource consumption, Evolution tries to delay instantiating
 * shell views until the user switches to them.  So in general, only the
 * active view name, as returned by e_shell_window_get_active_view(),
 * should be requested.
 *
 * The function emits a #EShellWindow::shell-view-created signal with
 * @view_name as the signal detail when it instantiates an #EShellView.
 *
 * Returns: the requested #EShellView, or %NULL if no such view is
 *          registered
 **/
EShellView *
e_shell_window_get_shell_view (EShellWindow *shell_window,
                               const gchar *view_name)
{
    EShellView *shell_view;
    EShellWindowClass *class;

    g_return_val_if_fail (E_IS_SHELL_WINDOW (shell_window), NULL);
    g_return_val_if_fail (view_name != NULL, NULL);

    shell_view = e_shell_window_peek_shell_view (shell_window, view_name);
    if (shell_view != NULL)
        return shell_view;

    class = E_SHELL_WINDOW_GET_CLASS (shell_window);
    g_return_val_if_fail (class->create_shell_view != NULL, NULL);

    shell_view = class->create_shell_view (shell_window, view_name);

    g_signal_emit (
        shell_window, signals[SHELL_VIEW_CREATED],
        g_quark_from_string (view_name), shell_view);

    return shell_view;
}

/**
 * e_shell_window_peek_shell_view:
 * @shell_window: an #EShellWindow
 * @view_name: name of a shell view
 *
 * Returns the #EShellView named @view_name (see the
 * <structfield>name</structfield> field in #EShellBackendInfo), or
 * %NULL if the requested view has not yet been instantiated.  Unlike
 * e_shell_window_get_shell_view(), this function will not instantiate
 * the view itself.
 *
 * Returns: the requested #EShellView, or %NULL if no such view is
 *          instantiated
 **/
EShellView *
e_shell_window_peek_shell_view (EShellWindow *shell_window,
                                const gchar *view_name)
{
    GHashTable *loaded_views;

    g_return_val_if_fail (E_IS_SHELL_WINDOW (shell_window), NULL);
    g_return_val_if_fail (view_name != NULL, NULL);

    loaded_views = shell_window->priv->loaded_views;

    return g_hash_table_lookup (loaded_views, view_name);
}

/**
 * e_shell_window_get_shell_view_action:
 * @shell_window: an #EShellWindow
 * @view_name: name of a shell view
 *
 * Returns the switcher action for @view_name.
 *
 * An #EShellWindow creates a #GtkRadioAction for each registered subclass
 * of #EShellView.  This action gets passed to the #EShellSwitcher, which
 * displays a button that proxies the action.  When the #EShellView named
 * @view_name is active, the action's icon becomes the @shell_window icon.
 *
 * Returns: the switcher action for the #EShellView named @view_name,
 *          or %NULL if no such shell view exists
 **/
GtkAction *
e_shell_window_get_shell_view_action (EShellWindow *shell_window,
                                      const gchar *view_name)
{
    GtkAction *action;
    gchar *action_name;

    g_return_val_if_fail (E_IS_SHELL_WINDOW (shell_window), NULL);
    g_return_val_if_fail (view_name != NULL, NULL);

    action_name = g_strdup_printf (E_SHELL_SWITCHER_FORMAT, view_name);
    action = e_shell_window_get_action (shell_window, action_name);
    g_free (action_name);

    return action;
}

/**
 * e_shell_window_get_focus_tracker:
 * @shell_window: an #EShellWindow
 *
 * Returns @shell_window<!-- -->'s focus tracker, which directs
 * Cut, Copy, Paste and Select All main menu activations to the
 * appropriate editable or selectable widget.
 *
 * Returns: the #EFocusTracker for @shell_window
 **/
EFocusTracker *
e_shell_window_get_focus_tracker (EShellWindow *shell_window)
{
    g_return_val_if_fail (E_IS_SHELL_WINDOW (shell_window), NULL);

    return shell_window->priv->focus_tracker;
}

/**
 * e_shell_window_get_ui_manager:
 * @shell_window: an #EShellWindow
 *
 * Returns @shell_window<!-- -->'s user interface manager, which
 * manages the window's menus and toolbars via #GtkAction<!-- -->s.
 * This is the mechanism by which shell views and plugins can extend
 * Evolution's menus and toolbars.
 *
 * Returns: the #GtkUIManager for @shell_window
 **/
GtkUIManager *
e_shell_window_get_ui_manager (EShellWindow *shell_window)
{
    g_return_val_if_fail (E_IS_SHELL_WINDOW (shell_window), NULL);

    return shell_window->priv->ui_manager;
}

/**
 * e_shell_window_get_action:
 * @shell_window: an #EShellWindow
 * @action_name: the name of an action
 *
 * Returns the #GtkAction named @action_name in @shell_window<!-- -->'s
 * user interface manager, or %NULL if no such action exists.
 *
 * Returns: the #GtkAction named @action_name
 **/
GtkAction *
e_shell_window_get_action (EShellWindow *shell_window,
                           const gchar *action_name)
{
    GtkUIManager *ui_manager;

    g_return_val_if_fail (E_IS_SHELL_WINDOW (shell_window), NULL);
    g_return_val_if_fail (action_name != NULL, NULL);

    ui_manager = e_shell_window_get_ui_manager (shell_window);

    return e_lookup_action (ui_manager, action_name);
}

/**
 * e_shell_window_get_action_group:
 * @shell_window: an #EShellWindow
 * @group_name: the name of an action group
 *
 * Returns the #GtkActionGroup named @group_name in
 * @shell_window<!-- -->'s user interface manager, or %NULL if no
 * such action group exists.
 *
 * Returns: the #GtkActionGroup named @group_name
 **/
GtkActionGroup *
e_shell_window_get_action_group (EShellWindow *shell_window,
                                 const gchar *group_name)
{
    GtkUIManager *ui_manager;

    g_return_val_if_fail (E_IS_SHELL_WINDOW (shell_window), NULL);
    g_return_val_if_fail (group_name != NULL, NULL);

    ui_manager = e_shell_window_get_ui_manager (shell_window);

    return e_lookup_action_group (ui_manager, group_name);
}

/**
 * e_shell_window_get_managed_widget:
 * @shell_window: an #EShellWindow
 * @widget_path: path in the UI definintion
 *
 * Looks up a widget in @shell_window<!-- -->'s user interface manager by
 * following a path.  See gtk_ui_manager_get_widget() for more information
 * about paths.
 *
 * Returns: the widget found by following the path, or %NULL if no widget
 *          was found
 **/
GtkWidget *
e_shell_window_get_managed_widget (EShellWindow *shell_window,
                                   const gchar *widget_path)
{
    GtkUIManager *ui_manager;
    GtkWidget *widget;

    g_return_val_if_fail (E_IS_SHELL_WINDOW (shell_window), NULL);
    g_return_val_if_fail (widget_path != NULL, NULL);

    ui_manager = e_shell_window_get_ui_manager (shell_window);
    widget = gtk_ui_manager_get_widget (ui_manager, widget_path);

    g_return_val_if_fail (widget != NULL, NULL);

    return widget;
}

/**
 * e_shell_window_get_active_view:
 * @shell_window: an #EShellWindow
 *
 * Returns the name of the active #EShellView.
 *
 * Returns: the name of the active view
 **/
const gchar *
e_shell_window_get_active_view (EShellWindow *shell_window)
{
    g_return_val_if_fail (E_IS_SHELL_WINDOW (shell_window), NULL);

    return shell_window->priv->active_view;
}

/**
 * e_shell_window_set_active_view:
 * @shell_window: an #EShellWindow
 * @view_name: the name of the shell view to switch to
 *
 * Switches @shell_window to the #EShellView named @view_name, causing
 * the entire content of @shell_window to change.  This is typically
 * called as a result of the user clicking one of the switcher buttons.
 *
 * The name of the newly activated shell view is also written to GConf key
 * <filename>/apps/evolution/shell/view_defaults/component_id</filename>.
 * This makes the active shell view persistent across Evolution sessions.
 * It also causes new shell windows created within the current Evolution
 * session to open to the most recently selected shell view.
 **/
void
e_shell_window_set_active_view (EShellWindow *shell_window,
                                const gchar *view_name)
{
    GtkAction *action;
    EShellView *shell_view;

    g_return_if_fail (E_IS_SHELL_WINDOW (shell_window));
    g_return_if_fail (view_name != NULL);

    shell_view = e_shell_window_get_shell_view (shell_window, view_name);
    g_return_if_fail (shell_view != NULL);

    action = e_shell_view_get_action (shell_view);
    gtk_action_activate (action);
}

/**
 * e_shell_window_get_safe_mode:
 * @shell_window: an #EShellWindow
 *
 * Returns %TRUE if @shell_window is in "safe mode".
 *
 * It's up to the various #EShellView<!-- -->'s to define exactly
 * what "safe mode" means.  The @shell_window simply manages the
 * "safe mode" state.
 *
 * Returns: %TRUE if @shell_window is in "safe mode"
 **/
gboolean
e_shell_window_get_safe_mode (EShellWindow *shell_window)
{
    g_return_val_if_fail (E_IS_SHELL_WINDOW (shell_window), FALSE);

    return shell_window->priv->safe_mode;
}

/**
 * e_shell_window_set_safe_mode:
 * @shell_window: an #EShellWindow
 * @safe_mode: whether to put @shell_window into "safe mode"
 *
 * If %TRUE, puts @shell_window into "safe mode".
 *
 * It's up to the various #EShellView<!-- -->'s to define exactly
 * what "safe mode" means.  The @shell_window simply manages the
 * "safe mode" state.
 **/
void
e_shell_window_set_safe_mode (EShellWindow *shell_window,
                              gboolean safe_mode)
{
    g_return_if_fail (E_IS_SHELL_WINDOW (shell_window));

    shell_window->priv->safe_mode = safe_mode;

    g_object_notify (G_OBJECT (shell_window), "safe-mode");
}

/**
 * e_shell_window_add_action_group:
 * @shell_window: an #EShellWindow
 * @group_name: the name of the new action group
 *
 * Creates a new #GtkActionGroup and adds it to @shell_window<!-- -->'s
 * user interface manager.  This also takes care of details like setting
 * the translation domain.
 **/
void
e_shell_window_add_action_group (EShellWindow *shell_window,
                                 const gchar *group_name)
{
    GtkActionGroup *action_group;
    GtkUIManager *ui_manager;
    const gchar *domain;

    g_return_if_fail (E_IS_SHELL_WINDOW (shell_window));
    g_return_if_fail (group_name != NULL);

    ui_manager = e_shell_window_get_ui_manager (shell_window);
    domain = GETTEXT_PACKAGE;

    action_group = gtk_action_group_new (group_name);
    gtk_action_group_set_translation_domain (action_group, domain);
    gtk_ui_manager_insert_action_group (ui_manager, action_group, 0);
    g_object_unref (action_group);
}

/**
 * e_shell_window_get_sidebar_visible:
 * @shell_window: an #EShellWindow
 *
 * Returns %TRUE if @shell_window<!-- -->'s side bar is visible.
 *
 * Returns: %TRUE is the side bar is visible
 **/
gboolean
e_shell_window_get_sidebar_visible (EShellWindow *shell_window)
{
    g_return_val_if_fail (E_IS_SHELL_WINDOW (shell_window), FALSE);

    return shell_window->priv->sidebar_visible;
}

/**
 * e_shell_window_set_sidebar_visible:
 * @shell_window: an #EShellWindow
 * @sidebar_visible: whether the side bar should be visible
 *
 * Makes @shell_window<!-- -->'s side bar visible or invisible.
 **/
void
e_shell_window_set_sidebar_visible (EShellWindow *shell_window,
                                    gboolean sidebar_visible)
{
    g_return_if_fail (E_IS_SHELL_WINDOW (shell_window));

    shell_window->priv->sidebar_visible = sidebar_visible;

    g_object_notify (G_OBJECT (shell_window), "sidebar-visible");
}

/**
 * e_shell_window_get_switcher_visible:
 * @shell_window: an #EShellWindow
 *
 * Returns %TRUE if @shell_window<!-- -->'s switcher buttons are visible.
 *
 * Returns: %TRUE is the switcher buttons are visible
 **/
gboolean
e_shell_window_get_switcher_visible (EShellWindow *shell_window)
{
    g_return_val_if_fail (E_IS_SHELL_WINDOW (shell_window), FALSE);

    return shell_window->priv->switcher_visible;
}

/**
 * e_shell_window_set_switcher_visible:
 * @shell_window: an #EShellWindow
 * @switcher_visible: whether the switcher buttons should be visible
 *
 * Makes @shell_window<!-- -->'s switcher buttons visible or invisible.
 **/
void
e_shell_window_set_switcher_visible (EShellWindow *shell_window,
                                     gboolean switcher_visible)
{
    g_return_if_fail (E_IS_SHELL_WINDOW (shell_window));

    shell_window->priv->switcher_visible = switcher_visible;

    g_object_notify (G_OBJECT (shell_window), "switcher-visible");
}

/**
 * e_shell_window_get_taskbar_visible:
 * @shell_window: an #EShellWindow
 *
 * Returns %TRUE if @shell_window<!-- -->'s task bar is visible.
 *
 * Returns: %TRUE is the task bar is visible
 **/
gboolean
e_shell_window_get_taskbar_visible (EShellWindow *shell_window)
{
    g_return_val_if_fail (E_IS_SHELL_WINDOW (shell_window), FALSE);

    return shell_window->priv->taskbar_visible;
}

/**
 * e_shell_window_set_taskbar_visible:
 * @shell_window: an #EShellWindow
 * @taskbar_visible: whether the task bar should be visible
 *
 * Makes @shell_window<!-- -->'s task bar visible or invisible.
 **/
void
e_shell_window_set_taskbar_visible (EShellWindow *shell_window,
                                    gboolean taskbar_visible)
{
    g_return_if_fail (E_IS_SHELL_WINDOW (shell_window));

    shell_window->priv->taskbar_visible = taskbar_visible;

    g_object_notify (G_OBJECT (shell_window), "taskbar-visible");
}

/**
 * e_shell_window_get_toolbar_visible:
 * @shell_window: an #EShellWindow
 *
 * Returns %TRUE if @shell_window<!-- -->'s tool bar is visible.
 *
 * Returns: %TRUE if the tool bar is visible
 **/
gboolean
e_shell_window_get_toolbar_visible (EShellWindow *shell_window)
{
    g_return_val_if_fail (E_IS_SHELL_WINDOW (shell_window), FALSE);

    return shell_window->priv->toolbar_visible;
}

/**
 * e_shell_window_set_toolbar_visible:
 * @shell_window: an #EShellWindow
 * @toolbar_visible: whether the tool bar should be visible
 *
 * Makes @shell_window<!-- -->'s tool bar visible or invisible.
 **/
void
e_shell_window_set_toolbar_visible (EShellWindow *shell_window,
                                    gboolean toolbar_visible)
{
    g_return_if_fail (E_IS_SHELL_WINDOW (shell_window));

    shell_window->priv->toolbar_visible = toolbar_visible;

    g_object_notify (G_OBJECT (shell_window), "toolbar-visible");
}

/**
 * e_shell_window_register_new_item_actions:
 * @shell_window: an #EShellWindow
 * @backend_name: name of an #EShellBackend
 * @entries: an array of #GtkActionEntry<!-- -->s
 * @n_entries: number of elements in the array
 *
 * Registers a list of #GtkAction<!-- -->s to appear in
 * @shell_window<!-- -->'s "New" menu and toolbar button.  This
 * function should be called from an #EShell<!-- -->'s
 * #EShell::window-created signal handler.  The #EShellBackend calling
 * this function should pass its own name for the @backend_name argument
 * (i.e. the <structfield>name</structfield> field from its own
 * #EShellBackendInfo).
 *
 * The registered #GtkAction<!-- -->s should be for creating individual
 * items such as an email message or a calendar appointment.  The action
 * labels should be marked for translation with the "New" context using
 * the NC_() macro.
 **/
void
e_shell_window_register_new_item_actions (EShellWindow *shell_window,
                                          const gchar *backend_name,
                                          GtkActionEntry *entries,
                                          guint n_entries)
{
    GtkActionGroup *action_group;
    GtkAccelGroup *accel_group;
    GtkUIManager *ui_manager;
    guint ii;

    g_return_if_fail (E_IS_SHELL_WINDOW (shell_window));
    g_return_if_fail (backend_name != NULL);
    g_return_if_fail (entries != NULL);

    action_group = ACTION_GROUP (NEW_ITEM);
    ui_manager = e_shell_window_get_ui_manager (shell_window);
    accel_group = gtk_ui_manager_get_accel_group (ui_manager);
    backend_name = g_intern_string (backend_name);

    /* XXX The action label translations are retrieved from the
     *     message context "New", but gtk_action_group_add_actions()
     *     does not support message contexts.  So we have to fetch
     *     the label translations ourselves before adding them to
     *     the action group.
     *
     *     gtk_action_group_set_translate_func() does not help here
     *     because the action tooltips do not use a message context
     *     (though I suppose they could). */
    for (ii = 0; ii < n_entries; ii++)
        entries[ii].label = g_dpgettext2 (
            GETTEXT_PACKAGE, "New", entries[ii].label);

    gtk_action_group_add_actions (
        action_group, entries, n_entries, shell_window);

    /* Tag each action with the name of the shell backend that
     * registered it.  This is used to help sort actions in the
     * "New" menu. */

    for (ii = 0; ii < n_entries; ii++) {
        const gchar *action_name;
        GtkAction *action;

        action_name = entries[ii].name;

        action = gtk_action_group_get_action (
            action_group, action_name);

        gtk_action_set_accel_group (action, accel_group);

        g_object_set_data (
            G_OBJECT (action),
            "backend-name", (gpointer) backend_name);

        /* The first action becomes the first item in the "New"
         * menu, and consequently its icon is shown in the "New"
         * button when the shell backend's view is active.  This
         * is all sorted out in shell_window_extract_actions().
         * Note, the data value just needs to be non-zero. */
        if (ii == 0)
            g_object_set_data (
                G_OBJECT (action),
                "primary", GINT_TO_POINTER (TRUE));
    }
}

/**
 * e_shell_window_register_new_source_actions:
 * @shell_window: an #EShellWindow
 * @backend_name: name of an #EShellBackend
 * @entries: an array of #GtkActionEntry<!-- -->s
 * @n_entries: number of elements in the array
 *
 * Registers a list of #GtkAction<!-- -->s to appear in
 * @shell_window<!-- -->'s "New" menu and toolbar button.  This
 * function should be called from an #EShell<!-- -->'s
 * #EShell::window-created signal handler.  The #EShellBackend calling
 * this function should pass its own name for the @backend_name argument
 * (i.e. the <structfield>name</structfield> field from its own
 * #EShellBackendInfo).
 *
 * The registered #GtkAction<!-- -->s should be for creating item
 * containers such as an email folder or a calendar.  The action labels
 * should be marked for translation with the "New" context using the
 * NC_() macro.
 **/
void
e_shell_window_register_new_source_actions (EShellWindow *shell_window,
                                            const gchar *backend_name,
                                            GtkActionEntry *entries,
                                            guint n_entries)
{
    GtkActionGroup *action_group;
    GtkAccelGroup *accel_group;
    GtkUIManager *ui_manager;
    guint ii;

    g_return_if_fail (E_IS_SHELL_WINDOW (shell_window));
    g_return_if_fail (backend_name != NULL);
    g_return_if_fail (entries != NULL);

    action_group = ACTION_GROUP (NEW_SOURCE);
    ui_manager = e_shell_window_get_ui_manager (shell_window);
    accel_group = gtk_ui_manager_get_accel_group (ui_manager);
    backend_name = g_intern_string (backend_name);

    /* XXX The action label translations are retrieved from the
     *     message context "New", but gtk_action_group_add_actions()
     *     does not support message contexts.  So we have to fetch
     *     the label translations ourselves before adding them to
     *     the action group.
     *
     *     gtk_action_group_set_translate_func() does not help here
     *     because the action tooltips do not use a message context
     *     (though I suppose they could). */
    for (ii = 0; ii < n_entries; ii++)
        entries[ii].label = g_dpgettext2 (
            GETTEXT_PACKAGE, "New", entries[ii].label);

    gtk_action_group_add_actions (
        action_group, entries, n_entries, shell_window);

    /* Tag each action with the name of the shell backend that
     * registered it.  This is used to help sort actions in the
     * "New" menu. */

    for (ii = 0; ii < n_entries; ii++) {
        const gchar *action_name;
        GtkAction *action;

        action_name = entries[ii].name;

        action = gtk_action_group_get_action (
            action_group, action_name);

        gtk_action_set_accel_group (action, accel_group);

        g_object_set_data (
            G_OBJECT (action),
            "backend-name", (gpointer) backend_name);
    }
}