1 files changed, 32 insertions, 1 deletions

diff --git a/lib/src/turns-turn-order.c b/lib/src/turns-turn-order.c
index 9a08d2e..abc22c4 100644
--- a/lib/src/turns-turn-order.c
+++ b/lib/src/turns-turn-order.c
@@ -13,7 +13,8 @@
 
 enum
 {
-  PROP_RUNNING = 1,
+  PROP_EMPTY = 1,
+  PROP_RUNNING,
   PROP_SORT_MODE,
   N_PROPERTIES,
 };
@@ -79,6 +80,8 @@ static void clear_participants(TurnsTurnOrder * self)
 
   g_slist_free_full(self->participants, g_object_unref);
   self->participants = nullptr;
+
+  g_object_notify_by_pspec(G_OBJECT(self), properties[PROP_EMPTY]);
 }
 
 static void set_running(TurnsTurnOrder * self, gboolean value)
@@ -105,6 +108,9 @@ static void turns_turn_order_get_property(GObject * self, guint id, GValue * val
 
   switch (id)
   {
+  case PROP_EMPTY:
+    g_value_set_boolean(value, turns_turn_order_get_empty(instance));
+    return;
   case PROP_RUNNING:
     g_value_set_boolean(value, turns_turn_order_get_running(instance));
     return;
@@ -154,6 +160,12 @@ static void turns_turn_order_class_init(TurnsTurnOrderClass * klass)
   object_class->get_property = turns_turn_order_get_property;
   object_class->set_property = turns_turn_order_set_property;
 
+  properties[PROP_EMPTY] = g_param_spec_boolean("empty",
+                                                "Empty",
+                                                "Whether the turn order is empty.",
+                                                TRUE,
+                                                G_PARAM_STATIC_STRINGS | G_PARAM_READABLE | G_PARAM_EXPLICIT_NOTIFY);
+
   properties[PROP_RUNNING] = g_param_spec_boolean("running",
                                                   "Running",
                                                   "Whether or not the turn order is running (e.g. has been started)",
@@ -207,10 +219,16 @@ void turns_turn_order_add(TurnsTurnOrder * self, TurnsParticipant * participant)
 
   auto sort_mode = turns_turn_order_get_sort_mode(self);
 
+  auto old_head = self->participants;
   self->participants = g_slist_insert_sorted_with_data(self->participants, g_object_ref(participant), compare_participant, (void *)sort_mode);
 
   auto position = g_slist_index(self->participants, participant);
 
+  if (old_head == nullptr && !turns_turn_order_get_empty(self))
+  {
+    g_object_notify_by_pspec(G_OBJECT(self), properties[PROP_EMPTY]);
+  }
+
   g_list_model_items_changed(G_LIST_MODEL(self), position, 0, 1);
 }
 
@@ -242,11 +260,24 @@ void turns_turn_order_remove_at(TurnsTurnOrder * self, guint position)
   }
 
   g_object_unref(element->data);
+  auto old_head = self->participants;
   self->participants = g_slist_delete_link(self->participants, element);
 
+  if (old_head != nullptr && turns_turn_order_get_empty(self))
+  {
+    g_object_notify_by_pspec(G_OBJECT(self), properties[PROP_EMPTY]);
+    set_running(self, false);
+  }
+
   g_list_model_items_changed(G_LIST_MODEL(self), position, 1, 0);
 }
 
+gboolean turns_turn_order_get_empty(TurnsTurnOrder const * self)
+{
+  g_return_val_if_fail(TURNS_IS_TURN_ORDER((TurnsTurnOrder *)self), true);
+  return self->participants == nullptr;
+}
+
 gsize turns_turn_order_get_participant_count(TurnsTurnOrder const * self)
 {
   g_return_val_if_fail(TURNS_IS_TURN_ORDER((TurnsTurnOrder *)self), 0);