path: root/modules/calendar/e-task-shell-sidebar.c

/*
 * e-task-shell-sidebar.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)
 *
 */

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

#include "e-task-shell-sidebar.h"

#include <string.h>
#include <glib/gi18n.h>
#include <libecal/e-cal.h>

#include "e-util/e-alert-dialog.h"
#include "e-util/e-util.h"
#include "calendar/common/authentication.h"
#include "calendar/gui/e-task-list-selector.h"
#include "calendar/gui/misc.h"

#include "e-task-shell-view.h"
#include "e-task-shell-backend.h"
#include "e-task-shell-content.h"

struct _ETaskShellSidebarPrivate {
    GtkWidget *selector;

    /* UID -> Client */
    GHashTable *client_table;

    /* The default client is for ECalModel.  It follows the
     * sidebar's primary selection, even if the highlighted
     * source is not selected.  The tricky part is we don't
     * update the property until the client is successfully
     * opened.  So the user first highlights a source, then
     * sometime later we update our default-client property
     * which is bound by an EBinding to ECalModel. */
    ECal *default_client;

    GCancellable *loading_default_client;
};

enum {
    PROP_0,
    PROP_DEFAULT_CLIENT,
    PROP_SELECTOR
};

enum {
    CLIENT_ADDED,
    CLIENT_REMOVED,
    STATUS_MESSAGE,
    LAST_SIGNAL
};

static gpointer parent_class;
static guint signals[LAST_SIGNAL];
static GType task_shell_sidebar_type;

static void
task_shell_sidebar_emit_client_added (ETaskShellSidebar *task_shell_sidebar,
                                      ECal *client)
{
    guint signal_id = signals[CLIENT_ADDED];

    g_signal_emit (task_shell_sidebar, signal_id, 0, client);
}

static void
task_shell_sidebar_emit_client_removed (ETaskShellSidebar *task_shell_sidebar,
                                        ECal *client)
{
    guint signal_id = signals[CLIENT_REMOVED];

    g_signal_emit (task_shell_sidebar, signal_id, 0, client);
}

static void
task_shell_sidebar_emit_status_message (ETaskShellSidebar *task_shell_sidebar,
                                        const gchar *status_message)
{
    guint signal_id = signals[STATUS_MESSAGE];

    g_signal_emit (task_shell_sidebar, signal_id, 0, status_message, -1.0);
}

static void
task_shell_sidebar_backend_died_cb (ETaskShellSidebar *task_shell_sidebar,
                                    ECal *client)
{
    EShellView *shell_view;
    EShellContent *shell_content;
    EShellSidebar *shell_sidebar;
    GHashTable *client_table;
    ESource *source;
    const gchar *uid;

    client_table = task_shell_sidebar->priv->client_table;

    shell_sidebar = E_SHELL_SIDEBAR (task_shell_sidebar);
    shell_view = e_shell_sidebar_get_shell_view (shell_sidebar);
    shell_content = e_shell_view_get_shell_content (shell_view);

    source = e_cal_get_source (client);
    uid = e_source_peek_uid (source);

    g_object_ref (source);

    g_hash_table_remove (client_table, uid);
    task_shell_sidebar_emit_status_message (task_shell_sidebar, NULL);

    e_alert_submit (
        E_ALERT_SINK (shell_content),
        "calendar:tasks-crashed", NULL);

    g_object_unref (source);
}

static void
task_shell_sidebar_backend_error_cb (ETaskShellSidebar *task_shell_sidebar,
                                     const gchar *message,
                                     ECal *client)
{
    EShellView *shell_view;
    EShellContent *shell_content;
    EShellSidebar *shell_sidebar;
    ESourceGroup *source_group;
    ESource *source;

    shell_sidebar = E_SHELL_SIDEBAR (task_shell_sidebar);
    shell_view = e_shell_sidebar_get_shell_view (shell_sidebar);
    shell_content = e_shell_view_get_shell_content (shell_view);

    source = e_cal_get_source (client);
    source_group = e_source_peek_group (source);

    e_alert_submit (
        E_ALERT_SINK (shell_content),
        "calendar:backend-error",
        e_source_group_peek_name (source_group),
        e_source_peek_name (source), message, NULL);
}

static void
task_shell_sidebar_client_opened_cb (ETaskShellSidebar *task_shell_sidebar,
                                     const GError *error,
                                     ECal *client)
{
    EShellView *shell_view;
    EShellContent *shell_content;
    EShellSidebar *shell_sidebar;
    const gchar *message;

    shell_sidebar = E_SHELL_SIDEBAR (task_shell_sidebar);
    shell_view = e_shell_sidebar_get_shell_view (shell_sidebar);
    shell_content = e_shell_view_get_shell_content (shell_view);

    if (g_error_matches (error, E_CALENDAR_ERROR,
        E_CALENDAR_STATUS_AUTHENTICATION_FAILED) ||
        g_error_matches (error, E_CALENDAR_ERROR,
        E_CALENDAR_STATUS_AUTHENTICATION_REQUIRED))
        e_auth_cal_forget_password (client);

    /* Handle errors. */
    switch (error ? error->code : E_CALENDAR_STATUS_OK) {
        case E_CALENDAR_STATUS_OK:
            break;

        case E_CALENDAR_STATUS_AUTHENTICATION_FAILED:
            e_cal_open_async (client, FALSE);
            return;

        case E_CALENDAR_STATUS_BUSY:
            return;

        case E_CALENDAR_STATUS_REPOSITORY_OFFLINE:
            e_alert_submit (
                E_ALERT_SINK (shell_content),
                "calendar:prompt-no-contents-offline-tasks",
                NULL);
            /* fall through */

        default:
            if (error->code != E_CALENDAR_STATUS_REPOSITORY_OFFLINE) {
                e_alert_submit (
                    E_ALERT_SINK (shell_content),
                    "calendar:failed-open-tasks",
                    error->message, NULL);
            }

            e_task_shell_sidebar_remove_source (
                task_shell_sidebar,
                e_cal_get_source (client));
            return;
    }

    g_assert (error == NULL);

    g_signal_handlers_disconnect_matched (
        client, G_SIGNAL_MATCH_FUNC, 0, 0, NULL,
        task_shell_sidebar_client_opened_cb, NULL);

    message = _("Loading tasks");
    task_shell_sidebar_emit_status_message (task_shell_sidebar, message);
    task_shell_sidebar_emit_client_added (task_shell_sidebar, client);
    task_shell_sidebar_emit_status_message (task_shell_sidebar, NULL);
}

static void
task_shell_sidebar_default_loaded_cb (ESource *source,
                                      GAsyncResult *result,
                                      EShellSidebar *shell_sidebar)
{
    ETaskShellSidebarPrivate *priv;
    EShellContent *shell_content;
    EShellView *shell_view;
    ECal *client;
    GError *error = NULL;

    priv = E_TASK_SHELL_SIDEBAR (shell_sidebar)->priv;

    shell_view = e_shell_sidebar_get_shell_view (shell_sidebar);
    shell_content = e_shell_view_get_shell_content (shell_view);

    client = e_load_cal_source_finish (source, result, &error);

    if (g_error_matches (error, G_IO_ERROR, G_IO_ERROR_CANCELLED)) {
        g_error_free (error);
        goto exit;

    } else if (error != NULL) {
        e_alert_submit (
            E_ALERT_SINK (shell_content),
            "calendar:failed-open-tasks",
            error->message, NULL);
        g_error_free (error);
        goto exit;
    }

    g_return_if_fail (E_IS_CAL (client));

    if (priv->default_client != NULL)
        g_object_unref (priv->default_client);

    priv->default_client = client;

    g_object_notify (G_OBJECT (shell_sidebar), "default-client");

exit:
    g_object_unref (shell_sidebar);
}

static void
task_shell_sidebar_set_default (ETaskShellSidebar *task_shell_sidebar,
                                ESource *source)
{
    ETaskShellSidebarPrivate *priv;
    EShellView *shell_view;
    EShellWindow *shell_window;
    EShellContent *shell_content;
    EShellSidebar *shell_sidebar;
    ETaskShellContent *task_shell_content;
    ECalSourceType source_type;
    ECalModel *model;
    ECal *client;
    icaltimezone *timezone;
    const gchar *uid;

    priv = task_shell_sidebar->priv;
    source_type = E_CAL_SOURCE_TYPE_TODO;

    /* FIXME Sidebar should not be accessing the EShellContent.
     *       This probably needs to be moved to ETaskShellView. */
    shell_sidebar = E_SHELL_SIDEBAR (task_shell_sidebar);
    shell_view = e_shell_sidebar_get_shell_view (shell_sidebar);
    shell_content = e_shell_view_get_shell_content (shell_view);
    shell_window = e_shell_view_get_shell_window (shell_view);

    task_shell_content = E_TASK_SHELL_CONTENT (shell_content);
    model = e_task_shell_content_get_task_model (task_shell_content);
    timezone = e_cal_model_get_timezone (model);

    /* Cancel any unfinished previous request. */
    if (priv->loading_default_client != NULL) {
        g_cancellable_cancel (priv->loading_default_client);
        g_object_unref (priv->loading_default_client);
        priv->loading_default_client = NULL;
    }

    uid = e_source_peek_uid (source);
    client = g_hash_table_lookup (priv->client_table, uid);

    /* If we already have an open connection for
     * this UID, we can finish immediately. */
    if (client != NULL) {
        if (priv->default_client != NULL)
            g_object_unref (priv->default_client);
        priv->default_client = g_object_ref (client);
        g_object_notify (G_OBJECT (shell_sidebar), "default-client");
        return;
    }

    priv->loading_default_client = g_cancellable_new ();

    e_load_cal_source_async (
        source, source_type, timezone,
        GTK_WINDOW (shell_window), priv->loading_default_client,
        (GAsyncReadyCallback) task_shell_sidebar_default_loaded_cb,
        g_object_ref (shell_sidebar));
}

static void
task_shell_sidebar_row_changed_cb (ETaskShellSidebar *task_shell_sidebar,
                                   GtkTreePath *tree_path,
                                   GtkTreeIter *tree_iter,
                                   GtkTreeModel *tree_model)
{
    ESourceSelector *selector;
    ESource *source;

    selector = e_task_shell_sidebar_get_selector (task_shell_sidebar);
    source = e_source_selector_get_source_by_path (selector, tree_path);

    /* XXX This signal gets emitted a lot while the model is being
     *     rebuilt, during which time we won't get a valid ESource.
     *     ESourceSelector should probably block this signal while
     *     rebuilding the model, but we'll be forgiving and not
     *     emit a warning. */
    if (!E_IS_SOURCE (source))
        return;

    if (e_source_selector_source_is_selected (selector, source))
        e_task_shell_sidebar_add_source (task_shell_sidebar, source);
    else
        e_task_shell_sidebar_remove_source (task_shell_sidebar, source);
}

static void
task_shell_sidebar_selection_changed_cb (ETaskShellSidebar *task_shell_sidebar,
                                         ESourceSelector *selector)
{
    EShellView *shell_view;
    EShellBackend *shell_backend;
    EShellSidebar *shell_sidebar;
    GSList *list, *iter;

    /* This signal is emitted less frequently than "row-changed",
     * especially when the model is being rebuilt.  So we'll take
     * it easy on poor GConf. */

    shell_sidebar = E_SHELL_SIDEBAR (task_shell_sidebar);
    shell_view = e_shell_sidebar_get_shell_view (shell_sidebar);
    shell_backend = e_shell_view_get_shell_backend (shell_view);

    list = e_source_selector_get_selection (selector);

    for (iter = list; iter != NULL; iter = iter->next) {
        ESource *source = iter->data;

        iter->data = (gpointer) e_source_peek_uid (source);
        g_object_unref (source);
    }

    e_task_shell_backend_set_selected_task_lists (
        E_TASK_SHELL_BACKEND (shell_backend), list);

    g_slist_free (list);
}

static void
task_shell_sidebar_primary_selection_changed_cb (ETaskShellSidebar *task_shell_sidebar,
                                                 ESourceSelector *selector)
{
    ESource *source;

    source = e_source_selector_get_primary_selection (selector);
    if (source == NULL)
        return;

    task_shell_sidebar_set_default (task_shell_sidebar, source);
}

static void
task_shell_sidebar_restore_state_cb (EShellWindow *shell_window,
                                     EShellView *shell_view,
                                     EShellSidebar *shell_sidebar)
{
    ETaskShellSidebarPrivate *priv;
    EShell *shell;
    EShellBackend *shell_backend;
    EShellSettings *shell_settings;
    ESourceSelector *selector;
    ESourceList *source_list;
    ESource *source;
    GtkTreeModel *model;
    GSList *list, *iter;

    priv = E_TASK_SHELL_SIDEBAR (shell_sidebar)->priv;

    shell = e_shell_window_get_shell (shell_window);
    shell_settings = e_shell_get_shell_settings (shell);

    shell_backend = e_shell_view_get_shell_backend (shell_view);
    g_return_if_fail (E_IS_TASK_SHELL_BACKEND (shell_backend));

    selector = E_SOURCE_SELECTOR (priv->selector);
    model = gtk_tree_view_get_model (GTK_TREE_VIEW (selector));

    source_list = e_task_shell_backend_get_source_list (
        E_TASK_SHELL_BACKEND (shell_backend));

    g_signal_connect_swapped (
        model, "row-changed",
        G_CALLBACK (task_shell_sidebar_row_changed_cb),
        shell_sidebar);

    g_signal_connect_swapped (
        selector, "primary-selection-changed",
        G_CALLBACK (task_shell_sidebar_primary_selection_changed_cb),
        shell_sidebar);

    g_object_bind_property_full (
        shell_settings, "cal-primary-task-list",
        selector, "primary-selection",
        G_BINDING_BIDIRECTIONAL |
        G_BINDING_SYNC_CREATE,
        (GBindingTransformFunc) e_binding_transform_uid_to_source,
        (GBindingTransformFunc) e_binding_transform_source_to_uid,
        g_object_ref (source_list),
        (GDestroyNotify) g_object_unref);

    list = e_task_shell_backend_get_selected_task_lists (
        E_TASK_SHELL_BACKEND (shell_backend));

    for (iter = list; iter != NULL; iter = iter->next) {
        const gchar *uid = iter->data;

        source = e_source_list_peek_source_by_uid (source_list, uid);

        if (source != NULL)
            e_source_selector_select_source (selector, source);
    }

    g_slist_foreach (list, (GFunc) g_free, NULL);
    g_slist_free (list);

    /* Listen for subsequent changes to the selector. */

    g_signal_connect_swapped (
        selector, "selection-changed",
        G_CALLBACK (task_shell_sidebar_selection_changed_cb),
        shell_sidebar);
}

static void
task_shell_sidebar_get_property (GObject *object,
                                 guint property_id,
                                 GValue *value,
                                 GParamSpec *pspec)
{
    switch (property_id) {
        case PROP_DEFAULT_CLIENT:
            g_value_set_object (
                value,
                e_task_shell_sidebar_get_default_client (
                E_TASK_SHELL_SIDEBAR (object)));
            return;

        case PROP_SELECTOR:
            g_value_set_object (
                value,
                e_task_shell_sidebar_get_selector (
                E_TASK_SHELL_SIDEBAR (object)));
            return;
    }

    G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
}

static void
task_shell_sidebar_dispose (GObject *object)
{
    ETaskShellSidebarPrivate *priv;

    priv = E_TASK_SHELL_SIDEBAR (object)->priv;

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

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

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

    g_hash_table_remove_all (priv->client_table);

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

static void
task_shell_sidebar_finalize (GObject *object)
{
    ETaskShellSidebarPrivate *priv;

    priv = E_TASK_SHELL_SIDEBAR (object)->priv;

    g_hash_table_destroy (priv->client_table);

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

static void
task_shell_sidebar_constructed (GObject *object)
{
    ETaskShellSidebarPrivate *priv;
    EShellView *shell_view;
    EShellWindow *shell_window;
    EShellBackend *shell_backend;
    EShellSidebar *shell_sidebar;
    ESourceList *source_list;
    GtkContainer *container;
    GtkWidget *widget;
    AtkObject *a11y;

    priv = E_TASK_SHELL_SIDEBAR (object)->priv;

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

    shell_sidebar = E_SHELL_SIDEBAR (object);
    shell_view = e_shell_sidebar_get_shell_view (shell_sidebar);
    shell_backend = e_shell_view_get_shell_backend (shell_view);
    shell_window = e_shell_view_get_shell_window (shell_view);

    source_list = e_task_shell_backend_get_source_list (
        E_TASK_SHELL_BACKEND (shell_backend));

    container = GTK_CONTAINER (shell_sidebar);

    widget = gtk_scrolled_window_new (NULL, NULL);
    gtk_scrolled_window_set_policy (
        GTK_SCROLLED_WINDOW (widget),
        GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC);
    gtk_scrolled_window_set_shadow_type (
        GTK_SCROLLED_WINDOW (widget), GTK_SHADOW_IN);
    gtk_container_add (container, widget);
    gtk_widget_show (widget);

    container = GTK_CONTAINER (widget);

    widget = e_task_list_selector_new (source_list);
    e_source_selector_set_select_new (E_SOURCE_SELECTOR (widget), TRUE);
    gtk_container_add (container, widget);
    a11y = gtk_widget_get_accessible (widget);
    atk_object_set_name (a11y, _("Task List Selector"));
    priv->selector = g_object_ref (widget);
    gtk_widget_show (widget);

    /* Restore widget state from the last session once
     * the shell view is fully initialized and visible. */
    g_signal_connect (
        shell_window, "shell-view-created::tasks",
        G_CALLBACK (task_shell_sidebar_restore_state_cb),
        shell_sidebar);
}

static guint32
task_shell_sidebar_check_state (EShellSidebar *shell_sidebar)
{
    ETaskShellSidebar *task_shell_sidebar;
    ESourceSelector *selector;
    ESource *source;
    gboolean can_delete = FALSE;
    gboolean is_system = FALSE;
    gboolean refresh_supported = FALSE;
    guint32 state = 0;

    task_shell_sidebar = E_TASK_SHELL_SIDEBAR (shell_sidebar);
    selector = e_task_shell_sidebar_get_selector (task_shell_sidebar);
    source = e_source_selector_get_primary_selection (selector);

    if (source != NULL) {
        ECal *client;
        const gchar *uri;
        const gchar *delete;

        uri = e_source_peek_relative_uri (source);
        is_system = (uri == NULL || strcmp (uri, "system") == 0);

        can_delete = !is_system;
        delete = e_source_get_property (source, "delete");
        can_delete &= (delete == NULL || strcmp (delete, "no") != 0);

        client = g_hash_table_lookup (
            task_shell_sidebar->priv->client_table,
            e_source_peek_uid (source));
        refresh_supported =
            client && e_cal_get_refresh_supported (client);
    }

    if (source != NULL)
        state |= E_TASK_SHELL_SIDEBAR_HAS_PRIMARY_SOURCE;
    if (can_delete)
        state |= E_TASK_SHELL_SIDEBAR_CAN_DELETE_PRIMARY_SOURCE;
    if (is_system)
        state |= E_TASK_SHELL_SIDEBAR_PRIMARY_SOURCE_IS_SYSTEM;
    if (refresh_supported)
        state |= E_TASK_SHELL_SIDEBAR_SOURCE_SUPPORTS_REFRESH;

    return state;
}

static void
task_shell_sidebar_client_removed (ETaskShellSidebar *task_shell_sidebar,
                                   ECal *client)
{
    ESourceSelector *selector;
    GHashTable *client_table;
    ESource *source;
    const gchar *uid;

    client_table = task_shell_sidebar->priv->client_table;
    selector = e_task_shell_sidebar_get_selector (task_shell_sidebar);

    g_signal_handlers_disconnect_matched (
        client, G_SIGNAL_MATCH_DATA, 0, 0,
        NULL, NULL, task_shell_sidebar);

    source = e_cal_get_source (client);
    uid = e_source_peek_uid (source);
    g_return_if_fail (uid != NULL);

    g_hash_table_remove (client_table, uid);
    e_source_selector_unselect_source (selector, source);

    task_shell_sidebar_emit_status_message (task_shell_sidebar, NULL);
}

static void
task_shell_sidebar_class_init (ETaskShellSidebarClass *class)
{
    GObjectClass *object_class;
    EShellSidebarClass *shell_sidebar_class;

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

    object_class = G_OBJECT_CLASS (class);
    object_class->get_property = task_shell_sidebar_get_property;
    object_class->dispose = task_shell_sidebar_dispose;
    object_class->finalize = task_shell_sidebar_finalize;
    object_class->constructed = task_shell_sidebar_constructed;

    shell_sidebar_class = E_SHELL_SIDEBAR_CLASS (class);
    shell_sidebar_class->check_state = task_shell_sidebar_check_state;

    class->client_removed = task_shell_sidebar_client_removed;

    g_object_class_install_property (
        object_class,
        PROP_DEFAULT_CLIENT,
        g_param_spec_object (
            "default-client",
            "Default Task Client",
            "Default client for task operations",
            E_TYPE_CAL,
            G_PARAM_READABLE));

    g_object_class_install_property (
        object_class,
        PROP_SELECTOR,
        g_param_spec_object (
            "selector",
            "Source Selector Widget",
            "This widget displays groups of task lists",
            E_TYPE_SOURCE_SELECTOR,
            G_PARAM_READABLE));

    signals[CLIENT_ADDED] = g_signal_new (
        "client-added",
        G_OBJECT_CLASS_TYPE (object_class),
        G_SIGNAL_RUN_LAST,
        G_STRUCT_OFFSET (ETaskShellSidebarClass, client_added),
        NULL, NULL,
        g_cclosure_marshal_VOID__OBJECT,
        G_TYPE_NONE, 1,
        E_TYPE_CAL);

    signals[CLIENT_REMOVED] = g_signal_new (
        "client-removed",
        G_OBJECT_CLASS_TYPE (object_class),
        G_SIGNAL_RUN_LAST,
        G_STRUCT_OFFSET (ETaskShellSidebarClass, client_removed),
        NULL, NULL,
        g_cclosure_marshal_VOID__OBJECT,
        G_TYPE_NONE, 1,
        E_TYPE_CAL);

    signals[STATUS_MESSAGE] = g_signal_new (
        "status-message",
        G_OBJECT_CLASS_TYPE (object_class),
        G_SIGNAL_RUN_LAST | G_SIGNAL_ACTION,
        G_STRUCT_OFFSET (ETaskShellSidebarClass, status_message),
        NULL, NULL,
        e_marshal_VOID__STRING_DOUBLE,
        G_TYPE_NONE, 2,
        G_TYPE_STRING,
        G_TYPE_DOUBLE);
}

static void
task_shell_sidebar_init (ETaskShellSidebar *task_shell_sidebar)
{
    GHashTable *client_table;

    client_table = g_hash_table_new_full (
        g_str_hash, g_str_equal,
        (GDestroyNotify) g_free,
        (GDestroyNotify) g_object_unref);

    task_shell_sidebar->priv = G_TYPE_INSTANCE_GET_PRIVATE (
        task_shell_sidebar, E_TYPE_TASK_SHELL_SIDEBAR,
        ETaskShellSidebarPrivate);

    task_shell_sidebar->priv->client_table = client_table;

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

GType
e_task_shell_sidebar_get_type (void)
{
    return task_shell_sidebar_type;
}

void
e_task_shell_sidebar_register_type (GTypeModule *type_module)
{
    static const GTypeInfo type_info = {
        sizeof (ETaskShellSidebarClass),
        (GBaseInitFunc) NULL,
        (GBaseFinalizeFunc) NULL,
        (GClassInitFunc) task_shell_sidebar_class_init,
        (GClassFinalizeFunc) NULL,
        NULL,  /* class_data */
        sizeof (ETaskShellSidebar),
        0,     /* n_preallocs */
        (GInstanceInitFunc) task_shell_sidebar_init,
        NULL   /* value_table */
    };

    task_shell_sidebar_type = g_type_module_register_type (
        type_module, E_TYPE_SHELL_SIDEBAR,
        "ETaskShellSidebar", &type_info, 0);
}

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

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

GList *
e_task_shell_sidebar_get_clients (ETaskShellSidebar *task_shell_sidebar)
{
    GHashTable *client_table;

    g_return_val_if_fail (
        E_IS_TASK_SHELL_SIDEBAR (task_shell_sidebar), NULL);

    client_table = task_shell_sidebar->priv->client_table;

    return g_hash_table_get_values (client_table);
}

ECal *
e_task_shell_sidebar_get_default_client (ETaskShellSidebar *task_shell_sidebar)
{
    g_return_val_if_fail (
        E_IS_TASK_SHELL_SIDEBAR (task_shell_sidebar), NULL);

    return task_shell_sidebar->priv->default_client;
}

ESourceSelector *
e_task_shell_sidebar_get_selector (ETaskShellSidebar *task_shell_sidebar)
{
    g_return_val_if_fail (
        E_IS_TASK_SHELL_SIDEBAR (task_shell_sidebar), NULL);

    return E_SOURCE_SELECTOR (task_shell_sidebar->priv->selector);
}

void
e_task_shell_sidebar_add_source (ETaskShellSidebar *task_shell_sidebar,
                                 ESource *source)
{
    EShellView *shell_view;
    EShellContent *shell_content;
    EShellSidebar *shell_sidebar;
    ETaskShellContent *task_shell_content;
    ECalSourceType source_type;
    ESourceSelector *selector;
    GHashTable *client_table;
    ECalModel *model;
    ECal *default_client;
    ECal *client;
    icaltimezone *timezone;
    const gchar *uid;
    const gchar *uri;
    gchar *message;

    g_return_if_fail (E_IS_TASK_SHELL_SIDEBAR (task_shell_sidebar));
    g_return_if_fail (E_IS_SOURCE (source));

    source_type = E_CAL_SOURCE_TYPE_TODO;
    client_table = task_shell_sidebar->priv->client_table;
    default_client = task_shell_sidebar->priv->default_client;
    selector = e_task_shell_sidebar_get_selector (task_shell_sidebar);

    uid = e_source_peek_uid (source);
    client = g_hash_table_lookup (client_table, uid);

    if (client != NULL)
        return;

    if (default_client != NULL) {
        ESource *default_source;
        const gchar *default_uid;

        default_source = e_cal_get_source (default_client);
        default_uid = e_source_peek_uid (default_source);

        if (g_strcmp0 (uid, default_uid) == 0)
            client = g_object_ref (default_client);
    }

    if (client == NULL)
        client = e_auth_new_cal_from_source (source, source_type);

    g_return_if_fail (client != NULL);

    g_signal_connect_swapped (
        client, "backend-died",
        G_CALLBACK (task_shell_sidebar_backend_died_cb),
        task_shell_sidebar);

    g_signal_connect_swapped (
        client, "backend-error",
        G_CALLBACK (task_shell_sidebar_backend_error_cb),
        task_shell_sidebar);

    g_hash_table_insert (client_table, g_strdup (uid), client);
    e_source_selector_select_source (selector, source);

    uri = e_cal_get_uri (client);
    /* Translators: The string field is a URI. */
    message = g_strdup_printf (_("Opening tasks at %s"), uri);
    task_shell_sidebar_emit_status_message (task_shell_sidebar, message);
    g_free (message);

    g_signal_connect_swapped (
        client, "cal-opened-ex",
        G_CALLBACK (task_shell_sidebar_client_opened_cb),
        task_shell_sidebar);

    /* FIXME Sidebar should not be accessing the EShellContent.
     *       This probably needs to be moved to ETaskShellView. */
    shell_sidebar = E_SHELL_SIDEBAR (task_shell_sidebar);
    shell_view = e_shell_sidebar_get_shell_view (shell_sidebar);
    shell_content = e_shell_view_get_shell_content (shell_view);

    task_shell_content = E_TASK_SHELL_CONTENT (shell_content);
    model = e_task_shell_content_get_task_model (task_shell_content);
    timezone = e_cal_model_get_timezone (model);

    e_cal_set_default_timezone (client, timezone, NULL);
    e_cal_open_async (client, FALSE);
}

void
e_task_shell_sidebar_remove_source (ETaskShellSidebar *task_shell_sidebar,
                                    ESource *source)
{
    GHashTable *client_table;
    ECal *client;
    const gchar *uid;

    g_return_if_fail (E_IS_TASK_SHELL_SIDEBAR (task_shell_sidebar));
    g_return_if_fail (E_IS_SOURCE (source));

    client_table = task_shell_sidebar->priv->client_table;

    uid = e_source_peek_uid (source);
    client = g_hash_table_lookup (client_table, uid);

    if (client == NULL)
        return;

    task_shell_sidebar_emit_client_removed (task_shell_sidebar, client);
}