public void set_filter_func (owned FlowBoxFilterFunc? filter_func)
By setting a filter function on the this one can decide dynamically which of the children to show.
For instance, to implement a search function that only shows the children matching the search terms.
Note that using a filter function is incompatible with using a model (see bind_model).
callback that lets you filter which children to show
destroy notifier for
user data passed to