[empathy] roster-view: add 'empty' property

[Guillaume Desmottes <gdesmott src gnome org>]

commit ab756d6ee9c60b803d8b7785cbc507b6a96580bf
Author: Guillaume Desmottes <guillaume desmottes collabora co uk>
Date:   Fri Jun 8 13:12:35 2012 +0200

    roster-view: add 'empty' property

 libempathy-gtk/empathy-roster-view.c         |   80 +++++++++++++++++++++++++-
 libempathy-gtk/empathy-roster-view.h         |    2 +
 tests/interactive/test-empathy-roster-view.c |   13 ++++
 3 files changed, 94 insertions(+), 1 deletions(-)
---
diff --git a/libempathy-gtk/empathy-roster-view.c b/libempathy-gtk/empathy-roster-view.c
index 3803c8b..bb10655 100644
--- a/libempathy-gtk/empathy-roster-view.c
+++ b/libempathy-gtk/empathy-roster-view.c
@@ -15,6 +15,7 @@ enum
   PROP_MANAGER = 1,
   PROP_SHOW_OFFLINE,
   PROP_SHOW_GROUPS,
+  PROP_EMPTY,
   N_PROPS
 };
 
@@ -45,9 +46,12 @@ struct _EmpathyRosterViewPriv
   GHashTable *roster_contacts;
   /* (gchar *group_name) -> EmpathyRosterGroup (borrowed) */
   GHashTable *roster_groups;
+  /* Hash of the EmpathyRosterContact currently displayed */
+  GHashTable *displayed_contacts;
 
   gboolean show_offline;
   gboolean show_groups;
+  gboolean empty;
 
   EmpathyLiveSearch *search;
 
@@ -74,6 +78,9 @@ empathy_roster_view_get_property (GObject *object,
       case PROP_SHOW_GROUPS:
         g_value_set_boolean (value, self->priv->show_groups);
         break;
+      case PROP_EMPTY:
+        g_value_set_boolean (value, self->priv->empty);
+        break;
       default:
         G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
         break;
@@ -512,6 +519,35 @@ is_searching (EmpathyRosterView *self)
   return gtk_widget_get_visible (GTK_WIDGET (self->priv->search));
 }
 
+static void
+update_empty (EmpathyRosterView *self,
+    gboolean empty)
+{
+  if (self->priv->empty == empty)
+    return;
+
+  self->priv->empty = empty;
+  g_object_notify (G_OBJECT (self), "empty");
+}
+
+static void
+add_to_displayed (EmpathyRosterView *self,
+    EmpathyRosterContact *contact)
+{
+  g_hash_table_add (self->priv->displayed_contacts, contact);
+  update_empty (self, FALSE);
+}
+
+static void
+remove_from_displayed (EmpathyRosterView *self,
+    EmpathyRosterContact *contact)
+{
+  g_hash_table_remove (self->priv->displayed_contacts, contact);
+
+  if (g_hash_table_size (self->priv->displayed_contacts) == 0)
+    update_empty (self, TRUE);
+}
+
 static gboolean
 filter_contact (EmpathyRosterView *self,
     EmpathyRosterContact *contact)
@@ -555,10 +591,19 @@ filter_contact (EmpathyRosterView *self,
           /* When searching, always display even if the group is closed */
           if (!is_searching (self) &&
               !gtk_expander_get_expanded (GTK_EXPANDER (group)))
-            return FALSE;
+            displayed = FALSE;
         }
     }
 
+  if (displayed)
+    {
+      add_to_displayed (self, contact);
+    }
+  else
+    {
+      remove_from_displayed (self, contact);
+    }
+
   return displayed;
 }
 
@@ -797,6 +842,7 @@ empathy_roster_view_finalize (GObject *object)
 
   g_hash_table_unref (self->priv->roster_contacts);
   g_hash_table_unref (self->priv->roster_groups);
+  g_hash_table_unref (self->priv->displayed_contacts);
 
   if (chain_up != NULL)
     chain_up (object);
@@ -917,12 +963,27 @@ empathy_roster_view_set_individual_tooltip_cb (EmpathyRosterView *self,
 }
 
 static void
+empathy_roster_view_remove (GtkContainer *container,
+    GtkWidget *widget)
+{
+  EmpathyRosterView *self = EMPATHY_ROSTER_VIEW (container);
+  void (*chain_up) (GtkContainer *, GtkWidget *) =
+      ((GtkContainerClass *) empathy_roster_view_parent_class)->remove;
+
+  chain_up (container, widget);
+
+  if (EMPATHY_IS_ROSTER_CONTACT (widget))
+    remove_from_displayed (self, (EmpathyRosterContact *) widget);
+}
+
+static void
 empathy_roster_view_class_init (
     EmpathyRosterViewClass *klass)
 {
   GObjectClass *oclass = G_OBJECT_CLASS (klass);
   EggListBoxClass *box_class = EGG_LIST_BOX_CLASS (klass);
   GtkWidgetClass *widget_class = GTK_WIDGET_CLASS (klass);
+  GtkContainerClass *container_class = GTK_CONTAINER_CLASS (klass);
   GParamSpec *spec;
 
   oclass->get_property = empathy_roster_view_get_property;
@@ -935,6 +996,8 @@ empathy_roster_view_class_init (
   widget_class->key_press_event = empathy_roster_view_key_press_event;
   widget_class->query_tooltip = empathy_roster_view_query_tooltip;
 
+  container_class->remove = empathy_roster_view_remove;
+
   box_class->child_activated = empathy_roster_view_child_activated;
 
   spec = g_param_spec_object ("manager", "Manager",
@@ -955,6 +1018,12 @@ empathy_roster_view_class_init (
       G_PARAM_READWRITE | G_PARAM_STATIC_STRINGS);
   g_object_class_install_property (oclass, PROP_SHOW_GROUPS, spec);
 
+  spec = g_param_spec_boolean ("empty", "Empty",
+      "Is the view currently empty?",
+      FALSE,
+      G_PARAM_READABLE | G_PARAM_STATIC_STRINGS);
+  g_object_class_install_property (oclass, PROP_EMPTY, spec);
+
   signals[SIG_INDIVIDUAL_ACTIVATED] = g_signal_new ("individual-activated",
       G_OBJECT_CLASS_TYPE (klass),
       G_SIGNAL_RUN_LAST,
@@ -982,6 +1051,9 @@ empathy_roster_view_init (EmpathyRosterView *self)
       NULL, (GDestroyNotify) g_hash_table_unref);
   self->priv->roster_groups = g_hash_table_new_full (g_str_hash, g_str_equal,
       g_free, NULL);
+  self->priv->displayed_contacts = g_hash_table_new (NULL, NULL);
+
+  self->priv->empty = TRUE;
 }
 
 GtkWidget *
@@ -1109,3 +1181,9 @@ empathy_roster_view_set_live_search (EmpathyRosterView *self,
   g_signal_connect (self->priv->search, "activate",
       G_CALLBACK (search_activate_cb), self);
 }
+
+gboolean
+empathy_roster_view_is_empty (EmpathyRosterView *self)
+{
+  return self->priv->empty;
+}
diff --git a/libempathy-gtk/empathy-roster-view.h b/libempathy-gtk/empathy-roster-view.h
index e5160f6..c0e615f 100644
--- a/libempathy-gtk/empathy-roster-view.h
+++ b/libempathy-gtk/empathy-roster-view.h
@@ -75,6 +75,8 @@ void empathy_roster_view_set_individual_tooltip_cb (EmpathyRosterView *self,
     EmpathyRosterViewIndividualTooltipCb callback,
     gpointer user_data);
 
+gboolean empathy_roster_view_is_empty (EmpathyRosterView *self);
+
 G_END_DECLS
 
 #endif /* #ifndef __EMPATHY_ROSTER_VIEW_H__*/
diff --git a/tests/interactive/test-empathy-roster-view.c b/tests/interactive/test-empathy-roster-view.c
index f10aaf2..becb332 100644
--- a/tests/interactive/test-empathy-roster-view.c
+++ b/tests/interactive/test-empathy-roster-view.c
@@ -65,6 +65,17 @@ individual_tooltip_cb (EmpathyRosterView *view,
   return TRUE;
 }
 
+static void
+empty_cb (EmpathyRosterView *view,
+    GParamSpec *spec,
+    gpointer user_data)
+{
+  if (empathy_roster_view_is_empty (view))
+    g_print ("view is now empty\n");
+  else
+    g_print ("view is no longer empty\n");
+}
+
 int
 main (int argc,
     char **argv)
@@ -100,6 +111,8 @@ main (int argc,
       G_CALLBACK (individual_activated_cb), NULL);
   g_signal_connect (view, "popup-individual-menu",
       G_CALLBACK (popup_individual_menu_cb), NULL);
+  g_signal_connect (view, "notify::empty",
+      G_CALLBACK (empty_cb), NULL);
 
   empathy_roster_view_show_offline (EMPATHY_ROSTER_VIEW (view), show_offline);
   empathy_roster_view_show_groups (EMPATHY_ROSTER_VIEW (view), show_groups);