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

/*
 * e-mail-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)
 *
 */

#include "e-mail-shell-content.h"

#include <glib/gi18n.h>
#include <camel/camel-store.h>
#include <libedataserver/e-data-server-util.h>

#include "e-util/e-util-private.h"
#include "e-util/e-binding.h"
#include "e-util/gconf-bridge.h"
#include "widgets/menus/gal-view-etable.h"
#include "widgets/menus/gal-view-instance.h"
#include "widgets/misc/e-paned.h"
#include "widgets/misc/e-preview-pane.h"
#include "widgets/misc/e-search-bar.h"

#include "em-utils.h"
#include "mail-config.h"
#include "mail-ops.h"
#include "message-list.h"

#include "e-mail-reader.h"
#include "e-mail-shell-backend.h"
#include "e-mail-shell-view-actions.h"

#define E_MAIL_SHELL_CONTENT_GET_PRIVATE(obj) \
    (G_TYPE_INSTANCE_GET_PRIVATE \
    ((obj), E_TYPE_MAIL_SHELL_CONTENT, EMailShellContentPrivate))

#define STATE_KEY_GROUP_BY_THREADS  "GroupByThreads"
#define STATE_KEY_SELECTED_MESSAGE  "SelectedMessage"
#define STATE_KEY_PREVIEW_VISIBLE   "PreviewVisible"

struct _EMailShellContentPrivate {
    GtkWidget *paned;
    GtkWidget *scrolled_window;
    GtkWidget *message_list;
    GtkWidget *search_bar;

    EMFormatHTMLDisplay *html_display;
    GalViewInstance *view_instance;
    GtkOrientation orientation;

    /* ETable scrolling hack */
    gdouble default_scrollbar_position;

    guint paned_binding_id;

    /* Signal handler IDs */
    guint message_list_built_id;

    guint group_by_threads          : 1;
    guint preview_visible           : 1;
    guint suppress_message_selection    : 1;
    guint show_deleted          : 1;
};

enum {
    PROP_0,
    PROP_GROUP_BY_THREADS,
    PROP_ORIENTATION,
    PROP_PREVIEW_VISIBLE,
    PROP_SHOW_DELETED
};

static gpointer parent_class;
static GType mail_shell_content_type;

static void
mail_shell_content_save_boolean (EMailShellContent *mail_shell_content,
                                 const gchar *key,
                                 gboolean value)
{
    EShellView *shell_view;
    EShellContent *shell_content;
    EMailReader *reader;
    GKeyFile *key_file;
    const gchar *folder_uri;
    gchar *group_name;

    shell_content = E_SHELL_CONTENT (mail_shell_content);
    shell_view = e_shell_content_get_shell_view (shell_content);
    key_file = e_shell_view_get_state_key_file (shell_view);

    reader = E_MAIL_READER (mail_shell_content);
    folder_uri = e_mail_reader_get_folder_uri (reader);

    if (folder_uri == NULL)
        return;

    group_name = g_strdup_printf ("Folder %s", folder_uri);
    g_key_file_set_boolean (key_file, group_name, key, value);
    g_free (group_name);

    e_shell_view_set_state_dirty (shell_view);
}

static void
mail_shell_content_message_list_built_cb (EMailShellContent *mail_shell_content,
                                          MessageList *message_list)
{
    EMailShellContentPrivate *priv = mail_shell_content->priv;
    EShellContent *shell_content;
    EShellView *shell_view;
    GKeyFile *key_file;
    gchar *uid;

    g_signal_handler_disconnect (
        message_list, priv->message_list_built_id);
    priv->message_list_built_id = 0;

    shell_content = E_SHELL_CONTENT (mail_shell_content);
    shell_view = e_shell_content_get_shell_view (shell_content);
    key_file = e_shell_view_get_state_key_file (shell_view);

    if (message_list->cursor_uid != NULL)
        uid = NULL;

    else if (message_list->folder_uri == NULL)
        uid = NULL;

    else if (mail_shell_content->priv->suppress_message_selection)
        uid = NULL;

    else {
        const gchar *folder_uri;
        const gchar *key;
        gchar *group_name;

        key = STATE_KEY_SELECTED_MESSAGE;
        folder_uri = message_list->folder_uri;
        group_name = g_strdup_printf ("Folder %s", folder_uri);
        uid = g_key_file_get_string (key_file, group_name, key, NULL);
        g_free (group_name);
    }

    if (uid != NULL) {
        CamelFolder *folder;
        CamelMessageInfo *info;

        folder = message_list->folder;
        info = camel_folder_get_message_info (folder, uid);
        if (info != NULL) {
            EMailReader *reader;

            reader = E_MAIL_READER (mail_shell_content);
            e_mail_reader_set_message (reader, uid);
            camel_folder_free_message_info (folder, info);
        }

        g_free (uid);
    }
}

static void
mail_shell_content_display_view_cb (EMailShellContent *mail_shell_content,
                                    GalView *gal_view)
{
    EMailReader *reader;
    GtkWidget *message_list;

    reader = E_MAIL_READER (mail_shell_content);
    message_list = e_mail_reader_get_message_list (reader);

    if (GAL_IS_VIEW_ETABLE (gal_view))
        gal_view_etable_attach_tree (
            GAL_VIEW_ETABLE (gal_view),
            E_TREE (message_list));
}

static void
mail_shell_content_message_selected_cb (EMailShellContent *mail_shell_content,
                                        const gchar *message_uid,
                                        MessageList *message_list)
{
    EShellContent *shell_content;
    EShellView *shell_view;
    GKeyFile *key_file;
    const gchar *folder_uri;
    const gchar *key;
    gchar *group_name;

    folder_uri = message_list->folder_uri;

    /* This also gets triggered when selecting a store name on
     * the sidebar such as "On This Computer", in which case
     * 'folder_uri' will be NULL. */
    if (folder_uri == NULL)
        return;

    shell_content = E_SHELL_CONTENT (mail_shell_content);
    shell_view = e_shell_content_get_shell_view (shell_content);
    key_file = e_shell_view_get_state_key_file (shell_view);

    key = STATE_KEY_SELECTED_MESSAGE;
    group_name = g_strdup_printf ("Folder %s", folder_uri);

    if (message_uid != NULL)
        g_key_file_set_string (key_file, group_name, key, message_uid);
    else
        g_key_file_remove_key (key_file, group_name, key, NULL);
    e_shell_view_set_state_dirty (shell_view);

    g_free (group_name);
}

static GtkOrientation
mail_shell_content_get_orientation (EMailShellContent *mail_shell_content)
{
    return mail_shell_content->priv->orientation;
}

static void
mail_shell_content_set_orientation (EMailShellContent *mail_shell_content,
                                    GtkOrientation orientation)
{
    mail_shell_content->priv->orientation = orientation;

    g_object_notify (G_OBJECT (mail_shell_content), "orientation");

    e_mail_shell_content_update_view_instance (mail_shell_content);
}

static void
mail_shell_content_set_property (GObject *object,
                                 guint property_id,
                                 const GValue *value,
                                 GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_GROUP_BY_THREADS:
            e_mail_shell_content_set_group_by_threads (
                E_MAIL_SHELL_CONTENT (object),
                g_value_get_boolean (value));
            return;

        case PROP_ORIENTATION:
            mail_shell_content_set_orientation (
                E_MAIL_SHELL_CONTENT (object),
                g_value_get_enum (value));
            return;

        case PROP_PREVIEW_VISIBLE:
            e_mail_shell_content_set_preview_visible (
                E_MAIL_SHELL_CONTENT (object),
                g_value_get_boolean (value));
            return;

        case PROP_SHOW_DELETED:
            e_mail_shell_content_set_show_deleted (
                E_MAIL_SHELL_CONTENT (object),
                g_value_get_boolean (value));
            return;
    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
mail_shell_content_get_property (GObject *object,
                                 guint property_id,
                                 GValue *value,
                                 GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_GROUP_BY_THREADS:
            g_value_set_boolean (
                value,
                e_mail_shell_content_get_group_by_threads (
                E_MAIL_SHELL_CONTENT (object)));
            return;

        case PROP_ORIENTATION:
            g_value_set_enum (
                value,
                mail_shell_content_get_orientation (
                E_MAIL_SHELL_CONTENT (object)));
            return;

        case PROP_PREVIEW_VISIBLE:
            g_value_set_boolean (
                value,
                e_mail_shell_content_get_preview_visible (
                E_MAIL_SHELL_CONTENT (object)));
            return;

        case PROP_SHOW_DELETED:
            g_value_set_boolean (
                value,
                e_mail_shell_content_get_show_deleted (
                E_MAIL_SHELL_CONTENT (object)));
            return;
    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
mail_shell_content_dispose (GObject *object)
{
    EMailShellContentPrivate *priv;

    priv = E_MAIL_SHELL_CONTENT_GET_PRIVATE (object);

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

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

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

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

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

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

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

static void
mail_shell_content_constructed (GObject *object)
{
    EMailShellContentPrivate *priv;
    EShellContent *shell_content;
    EShellBackend *shell_backend;
    EShellView *shell_view;
    ESearchBar *search_bar;
    EMailReader *reader;
    GtkWidget *message_list;
    GConfBridge *bridge;
    GtkWidget *container;
    GtkWidget *widget;
    EWebView *web_view;
    const gchar *key;

    priv = E_MAIL_SHELL_CONTENT_GET_PRIVATE (object);
    priv->html_display = em_format_html_display_new ();

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

    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);

    web_view = E_WEB_VIEW (EM_FORMAT_HTML (priv->html_display)->html);

    /* Build content widgets. */

    container = GTK_WIDGET (object);

    widget = e_paned_new (GTK_ORIENTATION_VERTICAL);
    gtk_container_add (GTK_CONTAINER (container), widget);
    priv->paned = g_object_ref (widget);
    gtk_widget_show (widget);

    e_binding_new (object, "orientation", widget, "orientation");

    container = priv->paned;

    widget = gtk_scrolled_window_new (NULL, NULL);
    gtk_scrolled_window_set_policy (
        GTK_SCROLLED_WINDOW (widget),
        GTK_POLICY_NEVER, GTK_POLICY_ALWAYS);
    gtk_scrolled_window_set_shadow_type (
        GTK_SCROLLED_WINDOW (widget), GTK_SHADOW_IN);
    priv->scrolled_window = g_object_ref (widget);
    gtk_paned_pack1 (GTK_PANED (container), widget, TRUE, FALSE);
    gtk_widget_show (widget);

    container = widget;

    widget = message_list_new (shell_backend);
    gtk_container_add (GTK_CONTAINER (container), widget);
    priv->message_list = g_object_ref (widget);
    gtk_widget_show (widget);

    container = priv->paned;

    gtk_widget_show (GTK_WIDGET (web_view));

    widget = e_preview_pane_new (web_view);
    gtk_paned_pack2 (GTK_PANED (container), widget, FALSE, FALSE);
    gtk_widget_show (widget);

    e_binding_new (object, "preview-visible", widget, "visible");

    search_bar = e_preview_pane_get_search_bar (E_PREVIEW_PANE (widget));
    priv->search_bar = g_object_ref (search_bar);

    g_signal_connect_swapped (
        search_bar, "changed",
        G_CALLBACK (em_format_redraw), priv->html_display);

    /* Load the view instance. */

    e_mail_shell_content_update_view_instance (
        E_MAIL_SHELL_CONTENT (shell_content));

    /* Bind GObject properties to GConf keys. */

    bridge = gconf_bridge_get ();

    object = G_OBJECT (priv->paned);
    key = "/apps/evolution/mail/display/hpaned_size";
    gconf_bridge_bind_property (bridge, key, object, "hposition");

    object = G_OBJECT (priv->paned);
    key = "/apps/evolution/mail/display/paned_size";
    gconf_bridge_bind_property (bridge, key, object, "vposition");

    object = G_OBJECT (shell_content);
    key = "/apps/evolution/mail/display/show_deleted";
    gconf_bridge_bind_property (bridge, key, object, "show-deleted");

    /* Message list customizations. */

    reader = E_MAIL_READER (shell_content);
    message_list = e_mail_reader_get_message_list (reader);

    g_signal_connect_swapped (
        message_list, "message-selected",
        G_CALLBACK (mail_shell_content_message_selected_cb),
        shell_content);
}

static guint32
mail_shell_content_check_state (EShellContent *shell_content)
{
    return e_mail_reader_check_state (E_MAIL_READER (shell_content));
}

static GtkActionGroup *
mail_shell_content_get_action_group (EMailReader *reader)
{
    EShellContent *shell_content;
    EShellWindow *shell_window;
    EShellView *shell_view;

    shell_content = E_SHELL_CONTENT (reader);
    shell_view = e_shell_content_get_shell_view (shell_content);
    shell_window = e_shell_view_get_shell_window (shell_view);

    return E_SHELL_WINDOW_ACTION_GROUP_MAIL (shell_window);
}

static gboolean
mail_shell_content_get_hide_deleted (EMailReader *reader)
{
    EMailShellContent *mail_shell_content;

    mail_shell_content = E_MAIL_SHELL_CONTENT (reader);

    return !e_mail_shell_content_get_show_deleted (mail_shell_content);
}

static EMFormatHTMLDisplay *
mail_shell_content_get_html_display (EMailReader *reader)
{
    EMailShellContentPrivate *priv;

    priv = E_MAIL_SHELL_CONTENT_GET_PRIVATE (reader);

    return priv->html_display;
}

static GtkWidget *
mail_shell_content_get_message_list (EMailReader *reader)
{
    EMailShellContentPrivate *priv;

    priv = E_MAIL_SHELL_CONTENT_GET_PRIVATE (reader);

    return priv->message_list;
}

static GtkMenu *
mail_shell_content_get_popup_menu (EMailReader *reader)
{
    EShellView *shell_view;
    EShellWindow *shell_window;
    EShellContent *shell_content;
    GtkUIManager *ui_manager;
    GtkWidget *widget;

    shell_content = E_SHELL_CONTENT (reader);
    shell_view = e_shell_content_get_shell_view (shell_content);
    shell_window = e_shell_view_get_shell_window (shell_view);

    ui_manager = e_shell_window_get_ui_manager (shell_window);
    widget = gtk_ui_manager_get_widget (ui_manager, "/mail-preview-popup");

    return GTK_MENU (widget);
}

static EShellBackend *
mail_shell_content_get_shell_backend (EMailReader *reader)
{
    EShellContent *shell_content;
    EShellView *shell_view;

    shell_content = E_SHELL_CONTENT (reader);
    shell_view = e_shell_content_get_shell_view (shell_content);

    return e_shell_view_get_shell_backend (shell_view);
}

static GtkWindow *
mail_shell_content_get_window (EMailReader *reader)
{
    EShellContent *shell_content;
    EShellWindow *shell_window;
    EShellView *shell_view;

    shell_content = E_SHELL_CONTENT (reader);
    shell_view = e_shell_content_get_shell_view (shell_content);
    shell_window = e_shell_view_get_shell_window (shell_view);

    return GTK_WINDOW (shell_window);
}

static void
mail_shell_content_set_folder (EMailReader *reader,
                               CamelFolder *folder,
                               const gchar *folder_uri)
{
    EShellView *shell_view;
    EShellContent *shell_content;
    EMailShellContentPrivate *priv;
    EMailReaderIface *default_iface;
    GtkWidget *message_list;
    CamelFolder *old_folder;
    GKeyFile *key_file;
    gchar *group_name;
    const gchar *key;
    gboolean different_folder;
    gboolean value;
    GError *error = NULL;

    priv = E_MAIL_SHELL_CONTENT_GET_PRIVATE (reader);

    old_folder = e_mail_reader_get_folder (reader);
    message_list = e_mail_reader_get_message_list (reader);

    message_list_freeze (MESSAGE_LIST (message_list));

    different_folder =
        (old_folder != NULL && folder != old_folder);

    /* Chain up to interface's default set_folder() method. */
    default_iface = g_type_default_interface_peek (E_TYPE_MAIL_READER);
    default_iface->set_folder (reader, folder, folder_uri);

    if (folder == NULL)
        goto exit;

    mail_refresh_folder (folder, NULL, NULL);

    /* This function gets triggered several times at startup,
     * so we don't want to reset the message suppression state
     * unless we're actually switching to a different folder. */
    if (different_folder)
        priv->suppress_message_selection = FALSE;

    /* This is a one-time-only callback. */
    if (MESSAGE_LIST (message_list)->cursor_uid == NULL &&
        priv->message_list_built_id == 0)
        priv->message_list_built_id = g_signal_connect_swapped (
            message_list, "message-list-built",
            G_CALLBACK (mail_shell_content_message_list_built_cb),
            reader);

    /* Restore the folder's preview and threaded state. */

    shell_content = E_SHELL_CONTENT (reader);
    shell_view = e_shell_content_get_shell_view (shell_content);

    key_file = e_shell_view_get_state_key_file (shell_view);
    group_name = g_strdup_printf ("Folder %s", folder_uri);

    key = STATE_KEY_GROUP_BY_THREADS;
    value = g_key_file_get_boolean (key_file, group_name, key, &error);
    if (error != NULL) {
        value = FALSE;
        g_clear_error (&error);
    }

    e_mail_shell_content_set_group_by_threads (
        E_MAIL_SHELL_CONTENT (shell_content), value);

    key = STATE_KEY_PREVIEW_VISIBLE;
    value = g_key_file_get_boolean (key_file, group_name, key, &error);
    if (error != NULL) {
        value = TRUE;
        g_clear_error (&error);
    }

    e_mail_shell_content_set_preview_visible (
        E_MAIL_SHELL_CONTENT (shell_content), value);

    g_free (group_name);

exit:
    message_list_thaw (MESSAGE_LIST (message_list));
}

static void
mail_shell_content_show_search_bar (EMailReader *reader)
{
    EMailShellContentPrivate *priv;

    priv = E_MAIL_SHELL_CONTENT_GET_PRIVATE (reader);

    gtk_widget_show (priv->search_bar);
}

static void
mail_shell_content_class_init (EMailShellContentClass *class)
{
    GObjectClass *object_class;
    EShellContentClass *shell_content_class;

    parent_class = g_type_class_peek_parent (class);
    g_type_class_add_private (class, sizeof (EMailShellContentPrivate));

    object_class = G_OBJECT_CLASS (class);
    object_class->set_property = mail_shell_content_set_property;
    object_class->get_property = mail_shell_content_get_property;
    object_class->dispose = mail_shell_content_dispose;
    object_class->constructed = mail_shell_content_constructed;

    shell_content_class = E_SHELL_CONTENT_CLASS (class);
    shell_content_class->check_state = mail_shell_content_check_state;

    g_object_class_install_property (
        object_class,
        PROP_GROUP_BY_THREADS,
        g_param_spec_boolean (
            "group-by-threads",
            _("Group by Threads"),
            _("Whether to group messages by threads"),
            FALSE,
            G_PARAM_READWRITE));

    g_object_class_install_property (
        object_class,
        PROP_PREVIEW_VISIBLE,
        g_param_spec_boolean (
            "preview-visible",
            _("Preview is Visible"),
            _("Whether the preview pane is visible"),
            TRUE,
            G_PARAM_READWRITE));

    g_object_class_install_property (
        object_class,
        PROP_SHOW_DELETED,
        g_param_spec_boolean (
            "show-deleted",
            "Show Deleted",
            NULL,
            FALSE,
            G_PARAM_READWRITE));

    g_object_class_override_property (
        object_class, PROP_ORIENTATION, "orientation");
}

static void
mail_shell_content_reader_init (EMailReaderIface *iface)
{
    iface->get_action_group = mail_shell_content_get_action_group;
    iface->get_hide_deleted = mail_shell_content_get_hide_deleted;
    iface->get_html_display = mail_shell_content_get_html_display;
    iface->get_message_list = mail_shell_content_get_message_list;
    iface->get_popup_menu = mail_shell_content_get_popup_menu;
    iface->get_shell_backend = mail_shell_content_get_shell_backend;
    iface->get_window = mail_shell_content_get_window;
    iface->set_folder = mail_shell_content_set_folder;
    iface->show_search_bar = mail_shell_content_show_search_bar;
}

static void
mail_shell_content_init (EMailShellContent *mail_shell_content)
{
    mail_shell_content->priv =
        E_MAIL_SHELL_CONTENT_GET_PRIVATE (mail_shell_content);

    mail_shell_content->priv->preview_visible = TRUE;

    /* Postpone widget construction until we have a shell view. */
}

GType
e_mail_shell_content_get_type (void)
{
    return mail_shell_content_type;
}

void
e_mail_shell_content_register_type (GTypeModule *type_module)
{
    static const GTypeInfo type_info = {
        sizeof (EMailShellContentClass),
        (GBaseInitFunc) NULL,
        (GBaseFinalizeFunc) NULL,
        (GClassInitFunc) mail_shell_content_class_init,
        (GClassFinalizeFunc) NULL,
        NULL,  /* class_data */
        sizeof (EMailShellContent),
        0,     /* n_preallocs */
        (GInstanceInitFunc) mail_shell_content_init,
        NULL   /* value_table */
    };

    static const GInterfaceInfo orientable_info = {
        (GInterfaceInitFunc) NULL,
        (GInterfaceFinalizeFunc) NULL,
        NULL  /* interface_data */
    };

    static const GInterfaceInfo reader_info = {
        (GInterfaceInitFunc) mail_shell_content_reader_init,
        (GInterfaceFinalizeFunc) NULL,
        NULL  /* interface_data */
    };

    mail_shell_content_type = g_type_module_register_type (
        type_module, E_TYPE_SHELL_CONTENT,
        "EMailShellContent", &type_info, 0);

    g_type_module_add_interface (
        type_module, mail_shell_content_type,
        GTK_TYPE_ORIENTABLE, &orientable_info);

    g_type_module_add_interface (
        type_module, mail_shell_content_type,
        E_TYPE_MAIL_READER, &reader_info);
}

GtkWidget *
e_mail_shell_content_new (EShellView *shell_view)
{
    g_return_val_if_fail (E_IS_SHELL_VIEW (shell_view), NULL);

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

gboolean
e_mail_shell_content_get_group_by_threads (EMailShellContent *mail_shell_content)
{
    g_return_val_if_fail (
        E_IS_MAIL_SHELL_CONTENT (mail_shell_content), FALSE);

    return mail_shell_content->priv->group_by_threads;
}

void
e_mail_shell_content_set_group_by_threads (EMailShellContent *mail_shell_content,
                                           gboolean group_by_threads)
{
    EMailReader *reader;
    GtkWidget *message_list;

    g_return_if_fail (E_IS_MAIL_SHELL_CONTENT (mail_shell_content));

    if (group_by_threads == mail_shell_content->priv->group_by_threads)
        return;

    mail_shell_content->priv->group_by_threads = group_by_threads;

    mail_shell_content_save_boolean (
        mail_shell_content,
        STATE_KEY_GROUP_BY_THREADS, group_by_threads);

    /* XXX MessageList should define a property for this. */
    reader = E_MAIL_READER (mail_shell_content);
    message_list = e_mail_reader_get_message_list (reader);
    message_list_set_threaded (
        MESSAGE_LIST (message_list), group_by_threads);

    g_object_notify (G_OBJECT (mail_shell_content), "group-by-threads");
}

gboolean
e_mail_shell_content_get_preview_visible (EMailShellContent *mail_shell_content)
{
    g_return_val_if_fail (
        E_IS_MAIL_SHELL_CONTENT (mail_shell_content), FALSE);

    return mail_shell_content->priv->preview_visible;
}

void
e_mail_shell_content_set_preview_visible (EMailShellContent *mail_shell_content,
                                          gboolean preview_visible)
{
    g_return_if_fail (E_IS_MAIL_SHELL_CONTENT (mail_shell_content));

    if (preview_visible == mail_shell_content->priv->preview_visible)
        return;

    /* If we're showing the preview, tell EMailReader to reload the
     * selected message.  This should force it to download the full
     * message if necessary, so we don't get an empty preview. */
    if (preview_visible) {
        EMailReader *reader;
        GtkWidget *message_list;
        const gchar *cursor_uid;

        reader = E_MAIL_READER (mail_shell_content);
        message_list = e_mail_reader_get_message_list (reader);
        cursor_uid = MESSAGE_LIST (message_list)->cursor_uid;

        if (cursor_uid != NULL)
            e_mail_reader_set_message (reader, cursor_uid);
    }

    mail_shell_content->priv->preview_visible = preview_visible;

    mail_shell_content_save_boolean (
        mail_shell_content,
        STATE_KEY_PREVIEW_VISIBLE, preview_visible);

    g_object_notify (G_OBJECT (mail_shell_content), "preview-visible");
}

EShellSearchbar *
e_mail_shell_content_get_searchbar (EMailShellContent *mail_shell_content)
{
    EShellContent *shell_content;
    GtkWidget *widget;

    g_return_val_if_fail (
        E_IS_MAIL_SHELL_CONTENT (mail_shell_content), NULL);

    shell_content = E_SHELL_CONTENT (mail_shell_content);
    widget = e_shell_content_get_searchbar (shell_content);

    return E_SHELL_SEARCHBAR (widget);
}

gboolean
e_mail_shell_content_get_show_deleted (EMailShellContent *mail_shell_content)
{
    g_return_val_if_fail (
        E_IS_MAIL_SHELL_CONTENT (mail_shell_content), FALSE);

    return mail_shell_content->priv->show_deleted;
}

void
e_mail_shell_content_set_show_deleted (EMailShellContent *mail_shell_content,
                                       gboolean show_deleted)
{
    g_return_if_fail (E_IS_MAIL_SHELL_CONTENT (mail_shell_content));

    mail_shell_content->priv->show_deleted = show_deleted;

    g_object_notify (G_OBJECT (mail_shell_content), "show-deleted");
}

GalViewInstance *
e_mail_shell_content_get_view_instance (EMailShellContent *mail_shell_content)
{
    g_return_val_if_fail (
        E_IS_MAIL_SHELL_CONTENT (mail_shell_content), NULL);

    return mail_shell_content->priv->view_instance;
}

void
e_mail_shell_content_set_search_strings (EMailShellContent *mail_shell_content,
                                         GSList *search_strings)
{
    ESearchBar *search_bar;
    ESearchingTokenizer *tokenizer;

    g_return_if_fail (E_IS_MAIL_SHELL_CONTENT (mail_shell_content));

    search_bar = E_SEARCH_BAR (mail_shell_content->priv->search_bar);
    tokenizer = e_search_bar_get_tokenizer (search_bar);

    e_searching_tokenizer_set_secondary_case_sensitivity (tokenizer, FALSE);
    e_searching_tokenizer_set_secondary_search_string (tokenizer, NULL);

    while (search_strings != NULL) {
        e_searching_tokenizer_add_secondary_search_string (
            tokenizer, search_strings->data);
        search_strings = g_slist_next (search_strings);
    }

    e_search_bar_changed (search_bar);
}

void
e_mail_shell_content_update_view_instance (EMailShellContent *mail_shell_content)
{
    EMailReader *reader;
    EShellContent *shell_content;
    EShellView *shell_view;
    EShellViewClass *shell_view_class;
    GalViewCollection *view_collection;
    GalViewInstance *view_instance;
    CamelFolder *folder;
    GtkOrientable *orientable;
    GtkOrientation orientation;
    gboolean outgoing_folder;
    gboolean show_vertical_view;
    const gchar *folder_uri;
    gchar *view_id;

    g_return_if_fail (E_IS_MAIL_SHELL_CONTENT (mail_shell_content));

    shell_content = E_SHELL_CONTENT (mail_shell_content);
    shell_view = e_shell_content_get_shell_view (shell_content);
    shell_view_class = E_SHELL_VIEW_GET_CLASS (shell_view);
    view_collection = shell_view_class->view_collection;

    reader = E_MAIL_READER (mail_shell_content);
    folder = e_mail_reader_get_folder (reader);
    folder_uri = e_mail_reader_get_folder_uri (reader);

    /* If no folder is selected, return silently. */
    if (folder == NULL)
        return;

    /* If we have a folder, we should also have a URI. */
    g_return_if_fail (folder_uri != NULL);

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

    view_id = mail_config_folder_to_safe_url (folder);
    view_instance = e_shell_view_new_view_instance (shell_view, view_id);
    mail_shell_content->priv->view_instance = view_instance;

    orientable = GTK_ORIENTABLE (mail_shell_content);
    orientation = gtk_orientable_get_orientation (orientable);
    show_vertical_view = (orientation == GTK_ORIENTATION_HORIZONTAL);

    if (show_vertical_view) {
        gchar *filename;
        gchar *safe_view_id;

        /* Force the view instance into vertical view. */

        g_free (view_instance->custom_filename);
        g_free (view_instance->current_view_filename);

        safe_view_id = g_strdup (view_id);
        e_filename_make_safe (safe_view_id);

        filename = g_strdup_printf (
            "custom_wide_view-%s.xml", safe_view_id);
        view_instance->custom_filename = g_build_filename (
            view_collection->local_dir, filename, NULL);
        g_free (filename);

        filename = g_strdup_printf (
            "current_wide_view-%s.xml", safe_view_id);
        view_instance->current_view_filename = g_build_filename (
            view_collection->local_dir, filename, NULL);
        g_free (filename);

        g_free (safe_view_id);
    }

    g_free (view_id);

    outgoing_folder =
        em_utils_folder_is_drafts (folder, folder_uri) ||
        em_utils_folder_is_outbox (folder, folder_uri) ||
        em_utils_folder_is_sent (folder, folder_uri);

    if (outgoing_folder) {
        if (show_vertical_view)
            gal_view_instance_set_default_view (
                view_instance, "Wide_View_Sent");
        else
            gal_view_instance_set_default_view (
                view_instance, "As_Sent_Folder");
    } else if (show_vertical_view) {
        gal_view_instance_set_default_view (
            view_instance, "Wide_View_Normal");
    }

    gal_view_instance_load (view_instance);

    if (!gal_view_instance_exists (view_instance)) {
        gchar *state_filename;

        state_filename = mail_config_folder_to_cachename (
            folder, "et-header-");

        if (g_file_test (state_filename, G_FILE_TEST_IS_REGULAR)) {
            ETableSpecification *spec;
            ETableState *state;
            GalView *view;
            gchar *spec_filename;

            spec = e_table_specification_new ();
            spec_filename = g_build_filename (
                EVOLUTION_ETSPECDIR,
                "message-list.etspec",
                NULL);
            e_table_specification_load_from_file (
                spec, spec_filename);
            g_free (spec_filename);

            state = e_table_state_new ();
            view = gal_view_etable_new (spec, "");

            e_table_state_load_from_file (
                state, state_filename);
            gal_view_etable_set_state (
                GAL_VIEW_ETABLE (view), state);
            gal_view_instance_set_custom_view (
                view_instance, view);

            g_object_unref (state);
            g_object_unref (view);
            g_object_unref (spec);
        }

        g_free (state_filename);
    }

    g_signal_connect_swapped (
        view_instance, "display-view",
        G_CALLBACK (mail_shell_content_display_view_cb),
        mail_shell_content);

    mail_shell_content_display_view_cb (
        mail_shell_content,
        gal_view_instance_get_current_view (view_instance));
}