layer: Add a method to check if a layer is empty or not

API: ges_timeline_layer_is_empty

bindings/python/ges.defs

@@ -956,6 +956,12 @@
   (return-type "GList*")
 )
 
+(define-method is_empty
+  (of-object "GESTimelineLayer")
+  (c-name "ges_timeline_layer_is_empty")
+  (return-type "gboolean")
+)
+
 
 
 ;; From ges-timeline-object.h

docs/libs/ges-sections.txt

@@ -285,6 +285,7 @@ ges_timeline_layer_get_objects
 ges_timeline_layer_get_timeline
 ges_timeline_layer_get_auto_transition
 ges_timeline_layer_set_auto_transition
+ges_timeline_layer_is_empty
 <SUBSECTION Standard>
 GESTimelineLayerPrivate
 ges_timeline_layer_set_timeline

ges/ges-timeline-layer.c

@@ -994,3 +994,21 @@ ges_timeline_layer_get_objects (GESTimelineLayer * layer)
   ret = g_list_reverse (ret);
   return ret;
 }
+
+/**
+ * ges_timeline_layer_is_empty:
+ * @layer: The #GESTimelineLayer to check
+ *
+ * Convenience method to check if @layer is empty (doesn't contain any object),
+ * or not.
+ *
+ * Returns: %TRUE if @layer is empty, %FALSE if it already contains at least
+ * one #GESTimelineObject
+ */
+gboolean
+ges_timeline_layer_is_empty (GESTimelineLayer * layer)
+{
+  g_return_val_if_fail (GES_IS_TIMELINE_LAYER (layer), FALSE);
+
+  return (layer->priv->objects_start == NULL);
+}

ges/ges-timeline-layer.h

@@ -108,6 +108,8 @@ gboolean ges_timeline_layer_remove_object (GESTimelineLayer * layer,
 void     ges_timeline_layer_set_priority  (GESTimelineLayer * layer,
 					   guint priority);
 
+gboolean ges_timeline_layer_is_empty      (GESTimelineLayer * layer);
+
 guint   ges_timeline_layer_get_priority  (GESTimelineLayer * layer);
 
 gboolean ges_timeline_layer_get_auto_transition (GESTimelineLayer * layer);