path: root/shell/e-shell-content.c

/*
 * e-shell-content.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-content
 * @short_description: the right side of the main window
 * @include: shell/e-shell-content.h
 **/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include "e-shell-content.h"

#include <glib/gi18n.h>
#include <libebackend/e-extensible.h>

#include "e-util/e-util.h"
#include "libevolution-utils/e-alert-dialog.h"
#include "libevolution-utils/e-alert-sink.h"
#include "filter/e-rule-editor.h"
#include "widgets/misc/e-action-combo-box.h"
#include "widgets/misc/e-alert-bar.h"

#include "e-shell-backend.h"
#include "e-shell-searchbar.h"
#include "e-shell-view.h"
#include "e-shell-window-actions.h"

#define E_SHELL_CONTENT_GET_PRIVATE(obj) \
    (G_TYPE_INSTANCE_GET_PRIVATE \
    ((obj), E_TYPE_SHELL_CONTENT, EShellContentPrivate))

struct _EShellContentPrivate {

    gpointer shell_view;    /* weak pointer */

    GtkWidget *alert_bar;
    GtkWidget *searchbar;   /* not referenced */

    /* Custom search rules. */
    gchar *user_filename;
};

enum {
    PROP_0,
    PROP_ALERT_BAR,
    PROP_SHELL_VIEW
};

/* Forward Declarations */
static void e_shell_content_alert_sink_init
                    (EAlertSinkInterface *interface);

G_DEFINE_TYPE_WITH_CODE (
    EShellContent,
    e_shell_content,
    GTK_TYPE_BIN,
    G_IMPLEMENT_INTERFACE (
        E_TYPE_ALERT_SINK, e_shell_content_alert_sink_init)
    G_IMPLEMENT_INTERFACE (
        E_TYPE_EXTENSIBLE, NULL));

static void
shell_content_dialog_rule_changed (GtkWidget *dialog,
                                   EFilterRule *rule)
{
    gboolean sensitive;

    sensitive = (rule != NULL) && (rule->parts != NULL);

    gtk_dialog_set_response_sensitive (
        GTK_DIALOG (dialog), GTK_RESPONSE_OK, sensitive);
    gtk_dialog_set_response_sensitive (
        GTK_DIALOG (dialog), GTK_RESPONSE_APPLY, sensitive);
}

static void
shell_content_set_shell_view (EShellContent *shell_content,
                              EShellView *shell_view)
{
    g_return_if_fail (shell_content->priv->shell_view == NULL);

    shell_content->priv->shell_view = shell_view;

    g_object_add_weak_pointer (
        G_OBJECT (shell_view),
        &shell_content->priv->shell_view);
}

static void
shell_content_set_property (GObject *object,
                            guint property_id,
                            const GValue *value,
                            GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_SHELL_VIEW:
            shell_content_set_shell_view (
                E_SHELL_CONTENT (object),
                g_value_get_object (value));
            return;
    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
shell_content_get_property (GObject *object,
                            guint property_id,
                            GValue *value,
                            GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_ALERT_BAR:
            g_value_set_object (
                value, e_shell_content_get_alert_bar (
                E_SHELL_CONTENT (object)));
            return;

        case PROP_SHELL_VIEW:
            g_value_set_object (
                value, e_shell_content_get_shell_view (
                E_SHELL_CONTENT (object)));
            return;
    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
shell_content_dispose (GObject *object)
{
    EShellContentPrivate *priv;

    priv = E_SHELL_CONTENT_GET_PRIVATE (object);

    if (priv->shell_view != NULL) {
        g_object_remove_weak_pointer (
            G_OBJECT (priv->shell_view), &priv->shell_view);
        priv->shell_view = NULL;
    }

    if (priv->alert_bar != NULL) {
        g_object_unref (priv->alert_bar);
        priv->alert_bar = NULL;
    }

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

static void
shell_content_finalize (GObject *object)
{
    EShellContentPrivate *priv;

    priv = E_SHELL_CONTENT_GET_PRIVATE (object);

    g_free (priv->user_filename);

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

static void
shell_content_constructed (GObject *object)
{
    EShellContent *shell_content;
    EShellBackend *shell_backend;
    EShellView *shell_view;
    GtkWidget *widget;
    const gchar *config_dir;

    shell_content = E_SHELL_CONTENT (object);
    shell_view = e_shell_content_get_shell_view (shell_content);
    shell_backend = e_shell_view_get_shell_backend (shell_view);

    widget = e_alert_bar_new ();
    gtk_widget_set_parent (widget, GTK_WIDGET (shell_content));
    shell_content->priv->alert_bar = g_object_ref_sink (widget);
    /* EAlertBar controls its own visibility. */

    /* XXX Regenerate the filename for custom saved search as done
     *     in shell_view_init_search_context().  ERuleContext ought
     *     to remember the filename when loading rules so you don't
     *     have to keep passing it in when saving rules. */
    config_dir = e_shell_backend_get_config_dir (shell_backend);
    shell_content->priv->user_filename =
        g_build_filename (config_dir, "searches.xml", NULL);

    e_extensible_load_extensions (E_EXTENSIBLE (object));

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

static void
shell_content_get_preferred_width (GtkWidget *widget,
                                   gint *minimum,
                                   gint *natural)
{
    EShellContentPrivate *priv;
    GtkWidget *child;

    priv = E_SHELL_CONTENT_GET_PRIVATE (widget);

    *minimum = *natural = 0;

    child = gtk_bin_get_child (GTK_BIN (widget));
    gtk_widget_get_preferred_width (child, minimum, natural);

    if (gtk_widget_get_visible (priv->alert_bar)) {
        gint child_minimum;
        gint child_natural;

        gtk_widget_get_preferred_width (
            priv->alert_bar, &child_minimum, &child_natural);

        *minimum = MAX (*minimum, child_minimum);
        *natural = MAX (*natural, child_natural);
    }

    if (priv->searchbar != NULL) {
        gint child_minimum;
        gint child_natural;

        gtk_widget_get_preferred_width (
            priv->searchbar, &child_minimum, &child_natural);

        *minimum = MAX (*minimum, child_minimum);
        *natural = MAX (*natural, child_natural);
    }
}

static void
shell_content_get_preferred_height (GtkWidget *widget,
                                    gint *minimum,
                                    gint *natural)
{
    EShellContentPrivate *priv;
    GtkWidget *child;

    priv = E_SHELL_CONTENT_GET_PRIVATE (widget);

    child = gtk_bin_get_child (GTK_BIN (widget));
    gtk_widget_get_preferred_height (child, minimum, natural);

    if (gtk_widget_get_visible (priv->alert_bar)) {
        gint child_minimum;
        gint child_natural;

        gtk_widget_get_preferred_height (
            priv->alert_bar, &child_minimum, &child_natural);

        *minimum += child_minimum;
        *natural += child_natural;
    }

    if (priv->searchbar != NULL) {
        gint child_minimum;
        gint child_natural;

        gtk_widget_get_preferred_height (
            priv->searchbar, &child_minimum, &child_natural);

        *minimum += child_minimum;
        *natural += child_natural;
    }
}

static void
shell_content_size_allocate (GtkWidget *widget,
                             GtkAllocation *allocation)
{
    EShellContentPrivate *priv;
    GtkAllocation child_allocation;
    GtkRequisition child_requisition;
    GtkWidget *child;
    gint remaining_height;

    priv = E_SHELL_CONTENT_GET_PRIVATE (widget);

    remaining_height = allocation->height;
    gtk_widget_set_allocation (widget, allocation);

    child_allocation.x = allocation->x;
    child_allocation.y = allocation->y;
    child_allocation.width = allocation->width;

    child_requisition.height = 0;

    /* Alert bar gets to be as tall as it wants (if visible). */

    child = priv->alert_bar;
    child_allocation.y += child_requisition.height;

    if (gtk_widget_get_visible (child))
        gtk_widget_get_preferred_height_for_width (child, child_allocation.width, &child_requisition.height, NULL);
    else
        child_requisition.height = 0;

    remaining_height -= child_requisition.height;
    child_allocation.height = child_requisition.height;

    if (child_allocation.height > 0)
        gtk_widget_size_allocate (child, &child_allocation);

    /* Search bar gets to be as tall as it wants (if we have one). */

    child = priv->searchbar;
    child_allocation.y += child_requisition.height;

    if (child != NULL)
        gtk_widget_get_preferred_size (child, &child_requisition, NULL);
    else
        child_requisition.height = 0;

    remaining_height -= child_requisition.height;
    child_allocation.height = child_requisition.height;

    if (child != NULL)
        gtk_widget_size_allocate (child, &child_allocation);

    /* The GtkBin child gets whatever vertical space is left. */

    child_allocation.y += child_requisition.height;
    child_allocation.height = remaining_height;

    child = gtk_bin_get_child (GTK_BIN (widget));
    if (child != NULL)
        gtk_widget_size_allocate (child, &child_allocation);
}

static void
shell_content_remove (GtkContainer *container,
                      GtkWidget *widget)
{
    GtkContainerClass *container_class;
    EShellContentPrivate *priv;

    priv = E_SHELL_CONTENT_GET_PRIVATE (container);

    if (widget == priv->alert_bar) {
        gtk_widget_unparent (priv->alert_bar);
        priv->alert_bar = NULL;
        return;
    }

    if (widget == priv->searchbar) {
        gtk_widget_unparent (priv->searchbar);
        priv->searchbar = NULL;
        return;
    }

    /* Chain up to parent's remove() method. */
    container_class = GTK_CONTAINER_CLASS (e_shell_content_parent_class);
    container_class->remove (container, widget);
}

static void
shell_content_forall (GtkContainer *container,
                      gboolean include_internals,
                      GtkCallback callback,
                      gpointer callback_data)
{
    EShellContentPrivate *priv;

    priv = E_SHELL_CONTENT_GET_PRIVATE (container);

    if (priv->alert_bar != NULL)
        callback (priv->alert_bar, callback_data);

    if (priv->searchbar != NULL)
        callback (priv->searchbar, callback_data);

    /* Chain up to parent's forall() method. */
    GTK_CONTAINER_CLASS (e_shell_content_parent_class)->forall (
        container, include_internals, callback, callback_data);
}

static void
shell_content_submit_alert (EAlertSink *alert_sink,
                            EAlert *alert)
{
    EShellView *shell_view;
    EShellWindow *shell_window;
    EShellContent *shell_content;
    GtkWidget *alert_bar;
    GtkWidget *dialog;

    shell_content = E_SHELL_CONTENT (alert_sink);
    shell_view = e_shell_content_get_shell_view (shell_content);
    shell_window = e_shell_view_get_shell_window (shell_view);
    alert_bar = e_shell_content_get_alert_bar (shell_content);

    switch (e_alert_get_message_type (alert)) {
        case GTK_MESSAGE_INFO:
        case GTK_MESSAGE_WARNING:
        case GTK_MESSAGE_ERROR:
            e_alert_bar_add_alert (
                E_ALERT_BAR (alert_bar), alert);
            break;

        default:
            dialog = e_alert_dialog_new (
                GTK_WINDOW (shell_window), alert);
            gtk_dialog_run (GTK_DIALOG (dialog));
            gtk_widget_destroy (dialog);
            break;
    }
}

static void
e_shell_content_class_init (EShellContentClass *class)
{
    GObjectClass *object_class;
    GtkWidgetClass *widget_class;
    GtkContainerClass *container_class;

    g_type_class_add_private (class, sizeof (EShellContentPrivate));

    object_class = G_OBJECT_CLASS (class);
    object_class->set_property = shell_content_set_property;
    object_class->get_property = shell_content_get_property;
    object_class->dispose = shell_content_dispose;
    object_class->finalize = shell_content_finalize;
    object_class->constructed = shell_content_constructed;

    widget_class = GTK_WIDGET_CLASS (class);
    widget_class->get_preferred_width = shell_content_get_preferred_width;
    widget_class->get_preferred_height = shell_content_get_preferred_height;
    widget_class->size_allocate = shell_content_size_allocate;

    container_class = GTK_CONTAINER_CLASS (class);
    container_class->remove = shell_content_remove;
    container_class->forall = shell_content_forall;

    /**
     * EShellContent:alert-bar
     *
     * Displays informational and error messages.
     **/
    g_object_class_install_property (
        object_class,
        PROP_ALERT_BAR,
        g_param_spec_object (
            "alert-bar",
            "Alert Bar",
            "Displays informational and error messages",
            E_TYPE_ALERT_BAR,
            G_PARAM_READABLE));

    /**
     * EShellContent:shell-view
     *
     * The #EShellView to which the content widget belongs.
     **/
    g_object_class_install_property (
        object_class,
        PROP_SHELL_VIEW,
        g_param_spec_object (
            "shell-view",
            NULL,
            NULL,
            E_TYPE_SHELL_VIEW,
            G_PARAM_READWRITE |
            G_PARAM_CONSTRUCT_ONLY));
}

static void
e_shell_content_alert_sink_init (EAlertSinkInterface *interface)
{
    interface->submit_alert = shell_content_submit_alert;
}

static void
e_shell_content_init (EShellContent *shell_content)
{
    shell_content->priv = E_SHELL_CONTENT_GET_PRIVATE (shell_content);

    gtk_widget_set_has_window (GTK_WIDGET (shell_content), FALSE);
}

/**
 * e_shell_content_new:
 * @shell_view: an #EShellView
 *
 * Creates a new #EShellContent instance belonging to @shell_view.
 *
 * Returns: a new #EShellContent instance
 **/
GtkWidget *
e_shell_content_new (EShellView *shell_view)
{
    g_return_val_if_fail (E_IS_SHELL_VIEW (shell_view), NULL);

    return g_object_new (
        E_TYPE_SHELL_CONTENT, "shell-view", shell_view, NULL);
}

/**
 * e_shell_content_set_searchbar:
 * @shell_content: an #EShellContent
 * @searchbar: a #GtkWidget, or %NULL
 *
 * Packs @searchbar at the top of @shell_content.
 **/
void
e_shell_content_set_searchbar (EShellContent *shell_content,
                               GtkWidget *searchbar)
{
    g_return_if_fail (E_IS_SHELL_CONTENT (shell_content));

    if (searchbar != NULL)
        g_return_if_fail (GTK_IS_WIDGET (searchbar));

    if (shell_content->priv->searchbar != NULL)
        gtk_container_remove (
            GTK_CONTAINER (shell_content),
            shell_content->priv->searchbar);

    shell_content->priv->searchbar = searchbar;

    if (searchbar != NULL)
        gtk_widget_set_parent (searchbar, GTK_WIDGET (shell_content));

    gtk_widget_queue_resize (GTK_WIDGET (shell_content));
}

/**
 * e_shell_content_check_state:
 * @shell_content: an #EShellContent
 *
 * #EShellContent subclasses should implement the
 * <structfield>check_state</structfield> method in #EShellContentClass
 * to return a set of flags describing the current content selection.
 * Subclasses are responsible for defining their own flags.  This is
 * primarily used to assist shell views with updating actions (see
 * e_shell_view_update_actions()).
 *
 * Returns: a set of flags describing the current @shell_content selection
 **/
guint32
e_shell_content_check_state (EShellContent *shell_content)
{
    EShellContentClass *shell_content_class;

    g_return_val_if_fail (E_IS_SHELL_CONTENT (shell_content), 0);

    shell_content_class = E_SHELL_CONTENT_GET_CLASS (shell_content);
    g_return_val_if_fail (shell_content_class->check_state != NULL, 0);

    return shell_content_class->check_state (shell_content);
}

/**
 * e_shell_content_focus_search_results:
 * @shell_content: an #EShellContent
 *
 * #EShellContent subclasses should implement the
 * <structfield>focus_search_results</structfield> method in
 * #EShellContentClass to direct input focus to the widget
 * displaying search results.  This is usually called during
 * e_shell_view_execute_search().
 **/
void
e_shell_content_focus_search_results (EShellContent *shell_content)
{
    EShellContentClass *shell_content_class;

    g_return_if_fail (E_IS_SHELL_CONTENT (shell_content));

    shell_content_class = E_SHELL_CONTENT_GET_CLASS (shell_content);

    if (shell_content_class->focus_search_results != NULL)
        shell_content_class->focus_search_results (shell_content);
}

/**
 * e_shell_content_get_alert_bar:
 * @shell_content: an #EShellContent
 *
 * Returns the #EAlertBar used to display informational and error messages.
 *
 * Returns: the #EAlertBar for @shell_content
 **/
GtkWidget *
e_shell_content_get_alert_bar (EShellContent *shell_content)
{
    g_return_val_if_fail (E_IS_SHELL_CONTENT (shell_content), NULL);

    return shell_content->priv->alert_bar;
}

/**
 * e_shell_content_get_shell_view:
 * @shell_content: an #EShellContent
 *
 * Returns the #EShellView that was passed to e_shell_content_new().
 *
 * Returns: the #EShellView to which @shell_content belongs
 **/
EShellView *
e_shell_content_get_shell_view (EShellContent *shell_content)
{
    g_return_val_if_fail (E_IS_SHELL_CONTENT (shell_content), NULL);

    return E_SHELL_VIEW (shell_content->priv->shell_view);
}

void
e_shell_content_run_advanced_search_dialog (EShellContent *shell_content)
{
    EShellView *shell_view;
    EShellWindow *shell_window;
    GtkWidget *content_area;
    GtkWidget *dialog;
    GtkWidget *widget;
    EFilterRule *rule;
    ERuleContext *context;
    const gchar *user_filename;
    gulong handler_id;
    gint response;
    EAlert *alert = NULL;

    g_return_if_fail (E_IS_SHELL_CONTENT (shell_content));

    shell_view = e_shell_content_get_shell_view (shell_content);
    shell_window = e_shell_view_get_shell_window (shell_view);
    user_filename = shell_content->priv->user_filename;

    rule = e_shell_view_get_search_rule (shell_view);

    if (rule == NULL)
        rule = e_filter_rule_new ();
    else
        rule = e_filter_rule_clone (rule);

    context = E_SHELL_VIEW_GET_CLASS (shell_view)->search_context;
    widget = e_filter_rule_get_widget (rule, context);
    e_filter_rule_set_source (rule, E_FILTER_SOURCE_INCOMING);

    dialog = gtk_dialog_new_with_buttons (
        _("Advanced Search"), GTK_WINDOW (shell_window),
        GTK_DIALOG_DESTROY_WITH_PARENT,
        GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
        GTK_STOCK_SAVE, GTK_RESPONSE_APPLY,
        GTK_STOCK_OK, GTK_RESPONSE_OK, NULL);

    gtk_container_set_border_width (GTK_CONTAINER (dialog), 7);
    gtk_container_set_border_width (GTK_CONTAINER (widget), 3);
    gtk_window_set_default_size (GTK_WINDOW (dialog), 600, 300);

    content_area = gtk_dialog_get_content_area (GTK_DIALOG (dialog));
    gtk_box_pack_start (GTK_BOX (content_area), widget, TRUE, TRUE, 0);

    handler_id = g_signal_connect_swapped (
        rule, "changed", G_CALLBACK (
        shell_content_dialog_rule_changed), dialog);

    shell_content_dialog_rule_changed (dialog, rule);

run:
    response = gtk_dialog_run (GTK_DIALOG (dialog));

    if (response != GTK_RESPONSE_OK && response != GTK_RESPONSE_APPLY)
        goto exit;

    if (!e_filter_rule_validate (rule, &alert)) {
        e_alert_run_dialog (GTK_WINDOW (dialog), alert);
        g_object_unref (alert);
        alert = NULL;
        goto run;
    }

    e_shell_view_custom_search (shell_view, rule);

    if (response == GTK_RESPONSE_APPLY) {
        if (!e_rule_context_find_rule (context, rule->name, rule->source))
            e_rule_context_add_rule (context, rule);
        e_rule_context_save (context, user_filename);
        goto run;
    }

exit:
    g_signal_handler_disconnect (rule, handler_id);

    g_object_unref (rule);
    gtk_widget_destroy (dialog);
}

void
e_shell_content_run_edit_searches_dialog (EShellContent *shell_content)
{
    EShellView *shell_view;
    ERuleContext *context;
    ERuleEditor *editor;
    const gchar *user_filename;

    g_return_if_fail (E_IS_SHELL_CONTENT (shell_content));

    shell_view = e_shell_content_get_shell_view (shell_content);
    context = E_SHELL_VIEW_GET_CLASS (shell_view)->search_context;
    user_filename = shell_content->priv->user_filename;

    editor = e_rule_editor_new (
        context, E_FILTER_SOURCE_INCOMING, _("Searches"));
    gtk_window_set_title (GTK_WINDOW (editor), _("Searches"));

    if (gtk_dialog_run (GTK_DIALOG (editor)) == GTK_RESPONSE_OK)
        e_rule_context_save (context, user_filename);

    gtk_widget_destroy (GTK_WIDGET (editor));
}

void
e_shell_content_run_save_search_dialog (EShellContent *shell_content)
{
    EShellView *shell_view;
    EShellWindow *shell_window;
    GtkWidget *content_area;
    GtkWidget *dialog;
    GtkWidget *widget;
    EFilterRule *rule;
    ERuleContext *context;
    const gchar *user_filename;
    gchar *search_name;
    gulong handler_id;
    gint response;
    EAlert *alert = NULL;

    g_return_if_fail (E_IS_SHELL_CONTENT (shell_content));

    shell_view = e_shell_content_get_shell_view (shell_content);
    shell_window = e_shell_view_get_shell_window (shell_view);
    user_filename = shell_content->priv->user_filename;

    rule = e_shell_view_get_search_rule (shell_view);
    g_return_if_fail (E_IS_FILTER_RULE (rule));
    rule = e_filter_rule_clone (rule);

    search_name = e_shell_view_get_search_name (shell_view);
    e_filter_rule_set_name (rule, search_name);
    g_free (search_name);

    context = E_SHELL_VIEW_GET_CLASS (shell_view)->search_context;
    widget = e_filter_rule_get_widget (rule, context);
    e_filter_rule_set_source (rule, E_FILTER_SOURCE_INCOMING);

    dialog = gtk_dialog_new_with_buttons (
        _("Save Search"), GTK_WINDOW (shell_window),
        GTK_DIALOG_DESTROY_WITH_PARENT,
        GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
        GTK_STOCK_OK, GTK_RESPONSE_OK, NULL);

    gtk_container_set_border_width (GTK_CONTAINER (dialog), 7);
    gtk_container_set_border_width (GTK_CONTAINER (widget), 3);
    gtk_window_set_default_size (GTK_WINDOW (dialog), 500, 300);

    content_area = gtk_dialog_get_content_area (GTK_DIALOG (dialog));
    gtk_box_pack_start (GTK_BOX (content_area), widget, TRUE, TRUE, 0);

    handler_id = g_signal_connect_swapped (
        rule, "changed", G_CALLBACK (
        shell_content_dialog_rule_changed), dialog);

    shell_content_dialog_rule_changed (dialog, rule);

run:
    response = gtk_dialog_run (GTK_DIALOG (dialog));

    if (response != GTK_RESPONSE_OK)
        goto exit;

    if (!e_filter_rule_validate (rule, &alert)) {
        e_alert_run_dialog (GTK_WINDOW (dialog), alert);
        g_object_unref (alert);
        alert = NULL;
        goto run;
    }

    /* XXX This function steals the rule reference, so
     *     counteract that by referencing it again. */
    e_rule_context_add_rule (context, g_object_ref (rule));

    e_rule_context_save (context, user_filename);

exit:
    g_signal_handler_disconnect (rule, handler_id);

    g_object_unref (rule);
    gtk_widget_destroy (dialog);
}