+
+
+GList *
+_gtk_tree_data_list_set_header (GList *header_list,
+ gint sort_column_id,
+ GtkTreeIterCompareFunc func,
+ gpointer data,
+ GDestroyNotify destroy)
+{
+ GList *list = header_list;
+ GtkTreeDataSortHeader *header = NULL;
+
+ for (; list; list = list->next)
+ {
+ header = (GtkTreeDataSortHeader*) list->data;
+ if (header->sort_column_id == sort_column_id)
+ break;
+ header = NULL;
+
+ if (list->next == NULL)
+ break;
+ }
+
+ if (header == NULL)
+ {
+ header = g_slice_new0 (GtkTreeDataSortHeader);
+ header->sort_column_id = sort_column_id;
+ if (list)
+ list = g_list_append (list, header);
+ else
+ header_list = g_list_append (header_list, header);
+ }
+
+ if (header->destroy)
+ {
+ GDestroyNotify d = header->destroy;
+
+ header->destroy = NULL;
+ d (header->data);
+ }
+
+ header->func = func;
+ header->data = data;
+ header->destroy = destroy;
+
+ return header_list;
+}