void gtk_tree_view_set_reorderable ( GtkTreeView* tree_view, gboolean reorderable )
This function is a convenience function to allow you to reorder
models that support the
GtkTreeDragSourceIface and the
TRUE, then the user can reorder the
model by dragging and dropping rows. The developer can listen to
these changes by connecting to the model’s
GtkTreeModel::row-deleted signals. The reordering is implemented
by setting up the tree view as a drag source and destination.
Therefore, drag and drop can not be used in a reorderable view for any
This function does not give you any degree of control over the order — any reordering is allowed. If more control is needed, you should probably handle drag and drop manually.