[evolution] ECalShellView: Handle error signals from calendar backends.

[Matthew Barnes <mbarnes src gnome org>]

commit 2f77dc2eb09a2f293134c39af34730344858d90a
Author: Matthew Barnes <mbarnes redhat com>
Date:   Fri Feb 15 21:18:52 2013 -0500

    ECalShellView: Handle error signals from calendar backends.

 modules/calendar/e-cal-shell-view-private.c |   46 +++++++++++++++++++++++++++
 modules/calendar/e-cal-shell-view-private.h |    3 ++
 2 files changed, 49 insertions(+), 0 deletions(-)
---
diff --git a/modules/calendar/e-cal-shell-view-private.c b/modules/calendar/e-cal-shell-view-private.c
index 5678daa..7bf36a1 100644
--- a/modules/calendar/e-cal-shell-view-private.c
+++ b/modules/calendar/e-cal-shell-view-private.c
@@ -393,6 +393,30 @@ cal_shell_view_user_created_cb (ECalShellView *cal_shell_view,
 }
 
 static void
+cal_shell_view_backend_error_cb (EClientCache *client_cache,
+                                 EClient *client,
+                                 EAlert *alert,
+                                 ECalShellView *cal_shell_view)
+{
+       ECalShellContent *cal_shell_content;
+       ESource *source;
+       const gchar *extension_name;
+
+       cal_shell_content = cal_shell_view->priv->cal_shell_content;
+
+       source = e_client_get_source (client);
+       extension_name = E_SOURCE_EXTENSION_CALENDAR;
+
+       /* Only submit alerts from calendar backends. */
+       if (e_source_has_extension (source, extension_name)) {
+               EAlertSink *alert_sink;
+
+               alert_sink = E_ALERT_SINK (cal_shell_content);
+               e_alert_sink_submit_alert (alert_sink, alert);
+       }
+}
+
+static void
 cal_shell_view_load_view_collection (EShellViewClass *shell_view_class)
 {
        GalViewCollection *collection;
@@ -548,6 +572,7 @@ e_cal_shell_view_private_constructed (ECalShellView *cal_shell_view)
        EShellSidebar *shell_sidebar;
        EShellWindow *shell_window;
        EShellView *shell_view;
+       EShell *shell;
        GnomeCalendar *calendar;
        ECalendar *date_navigator;
        EMemoTable *memo_table;
@@ -555,6 +580,7 @@ e_cal_shell_view_private_constructed (ECalShellView *cal_shell_view)
        ESourceSelector *selector;
        GtkWidget *widget;
        ECalModel *model;
+       gulong handler_id;
        gint ii;
 
        shell_view = E_SHELL_VIEW (cal_shell_view);
@@ -562,6 +588,7 @@ e_cal_shell_view_private_constructed (ECalShellView *cal_shell_view)
        shell_content = e_shell_view_get_shell_content (shell_view);
        shell_sidebar = e_shell_view_get_shell_sidebar (shell_view);
        shell_window = e_shell_view_get_shell_window (shell_view);
+       shell = e_shell_window_get_shell (shell_window);
 
        e_shell_window_add_action_group (shell_window, "calendar");
        e_shell_window_add_action_group (shell_window, "calendar-filter");
@@ -592,6 +619,16 @@ e_cal_shell_view_private_constructed (ECalShellView *cal_shell_view)
                date_navigator->calitem, (ECalendarItemGetTimeCallback)
                cal_shell_view_get_current_time, cal_shell_view, NULL);
 
+       /* Keep our own reference to this so we can
+        * disconnect our signal handler in dispose(). */
+       priv->client_cache = g_object_ref (e_shell_get_client_cache (shell));
+
+       handler_id = g_signal_connect (
+               priv->client_cache, "backend-error",
+               G_CALLBACK (cal_shell_view_backend_error_cb),
+               cal_shell_view);
+       priv->backend_error_handler_id = handler_id;
+
        for (ii = 0; ii < GNOME_CAL_LAST_VIEW; ii++) {
                ECalendarView *calendar_view;
 
@@ -742,10 +779,19 @@ e_cal_shell_view_private_dispose (ECalShellView *cal_shell_view)
        if (priv->cal_shell_content != NULL)
                e_cal_shell_content_save_state (priv->cal_shell_content);
 
+       if (priv->backend_error_handler_id > 0) {
+               g_signal_handler_disconnect (
+                       priv->client_cache,
+                       priv->backend_error_handler_id);
+               priv->backend_error_handler_id = 0;
+       }
+
        g_clear_object (&priv->cal_shell_backend);
        g_clear_object (&priv->cal_shell_content);
        g_clear_object (&priv->cal_shell_sidebar);
 
+       g_clear_object (&priv->client_cache);
+
        if (priv->calendar_activity != NULL) {
                /* XXX Activity is not cancellable. */
                e_activity_set_state (
diff --git a/modules/calendar/e-cal-shell-view-private.h b/modules/calendar/e-cal-shell-view-private.h
index a2dd1c3..a9c6202 100644
--- a/modules/calendar/e-cal-shell-view-private.h
+++ b/modules/calendar/e-cal-shell-view-private.h
@@ -93,6 +93,9 @@ struct _ECalShellViewPrivate {
        ECalShellContent *cal_shell_content;
        ECalShellSidebar *cal_shell_sidebar;
 
+       EClientCache *client_cache;
+       gulong backend_error_handler_id;
+
        /* The last time explicitly selected by the user. */
        time_t base_view_time;