[evolution] ETaskShellView: Handle error signals from task list backends.

[Matthew Barnes <mbarnes src gnome org>]

commit 519a1d0c3b3193a81e849910203e6a7ecc4ecc60
Author: Matthew Barnes <mbarnes redhat com>
Date:   Sat Feb 16 07:05:52 2013 -0500

    ETaskShellView: Handle error signals from task list backends.

 modules/calendar/e-task-shell-view-private.c |   50 ++++++++++++++++++++++++--
 modules/calendar/e-task-shell-view-private.h |    3 ++
 2 files changed, 50 insertions(+), 3 deletions(-)
---
diff --git a/modules/calendar/e-task-shell-view-private.c b/modules/calendar/e-task-shell-view-private.c
index 562c2a2..3803e51 100644
--- a/modules/calendar/e-task-shell-view-private.c
+++ b/modules/calendar/e-task-shell-view-private.c
@@ -167,6 +167,30 @@ task_shell_view_update_timeout_cb (ETaskShellView *task_shell_view)
 }
 
 static void
+task_shell_view_backend_error_cb (EClientCache *client_cache,
+                                  EClient *client,
+                                  EAlert *alert,
+                                  ETaskShellView *task_shell_view)
+{
+       ETaskShellContent *task_shell_content;
+       ESource *source;
+       const gchar *extension_name;
+
+       task_shell_content = task_shell_view->priv->task_shell_content;
+
+       source = e_client_get_source (client);
+       extension_name = E_SOURCE_EXTENSION_TASK_LIST;
+
+       /* Only submit alerts from task list backends. */
+       if (e_source_has_extension (source, extension_name)) {
+               EAlertSink *alert_sink;
+
+               alert_sink = E_ALERT_SINK (task_shell_content);
+               e_alert_sink_submit_alert (alert_sink, alert);
+       }
+}
+
+static void
 task_shell_view_load_view_collection (EShellViewClass *shell_view_class)
 {
        GalViewCollection *collection;
@@ -235,16 +259,17 @@ e_task_shell_view_private_constructed (ETaskShellView *task_shell_view)
        ETaskShellViewPrivate *priv = task_shell_view->priv;
        ETaskShellContent *task_shell_content;
        ETaskShellSidebar *task_shell_sidebar;
-       EShell *shell;
-       EShellView *shell_view;
+       EShellSettings *shell_settings;
        EShellBackend *shell_backend;
        EShellContent *shell_content;
        EShellSidebar *shell_sidebar;
-       EShellSettings *shell_settings;
        EShellWindow *shell_window;
+       EShellView *shell_view;
+       EShell *shell;
        ETaskTable *task_table;
        ECalModel *model;
        ESourceSelector *selector;
+       gulong handler_id;
 
        shell_view = E_SHELL_VIEW (task_shell_view);
        shell_backend = e_shell_view_get_shell_backend (shell_view);
@@ -270,6 +295,16 @@ e_task_shell_view_private_constructed (ETaskShellView *task_shell_view)
        task_shell_sidebar = E_TASK_SHELL_SIDEBAR (shell_sidebar);
        selector = e_task_shell_sidebar_get_selector (task_shell_sidebar);
 
+       /* 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 (task_shell_view_backend_error_cb),
+               task_shell_view);
+       priv->backend_error_handler_id = handler_id;
+
        g_signal_connect_object (
                model, "notify::timezone",
                G_CALLBACK (e_task_shell_view_update_timezone),
@@ -395,10 +430,19 @@ e_task_shell_view_private_dispose (ETaskShellView *task_shell_view)
 {
        ETaskShellViewPrivate *priv = task_shell_view->priv;
 
+       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->task_shell_backend);
        g_clear_object (&priv->task_shell_content);
        g_clear_object (&priv->task_shell_sidebar);
 
+       g_clear_object (&priv->client_cache);
+
        if (task_shell_view->priv->activity != NULL) {
                /* XXX Activity is not cancellable. */
                e_activity_set_state (
diff --git a/modules/calendar/e-task-shell-view-private.h b/modules/calendar/e-task-shell-view-private.h
index c0a38b7..14cb4c5 100644
--- a/modules/calendar/e-task-shell-view-private.h
+++ b/modules/calendar/e-task-shell-view-private.h
@@ -86,6 +86,9 @@ struct _ETaskShellViewPrivate {
        ETaskShellContent *task_shell_content;
        ETaskShellSidebar *task_shell_sidebar;
 
+       EClientCache *client_cache;
+       gulong backend_error_handler_id;
+
        EActivity *activity;
        guint update_timeout;
        guint update_completed_timeout;