def add_post_action_callback(self, cb):
self._post_action_callbacks.append(cb)<EOL>
Register a callback function to be invoked after each action (such as touch or swipe).

The arguments to be passed are identical to the callback function in
:py:meth:`add_pre_action_callback <poco.pocofw.Poco.add_pre_action_callback>`.

Args:
    cb: the callback function