Weakref breaks lambda callbacks

[Adam Olsen]

Weakref breaks lambda callbacks, for instance:

event.add_callback(lambda *e: self.update_track_counts(), 'tracks_added', self.queue)

That lambda function will never be called. This happens regardless of the new gobject.idle_add changes - I tried it in an older revision pre-gobject.

I have the suspicion that it doesn't work for inner functions either, for example:

def _connect_events(self):
        def queue_playlist_draw(*e):
            self.get_selected_playlist().list.queue_draw()

        event.add_callback(queue_playlist_draw, 'stop_track', self.queue)

queue_playlist_draw never gets called. I cannot tell if this is due to the weakref or the idle_add stuff.

[reacocard (reacocard)]

This is by the nature of weakrefs - if there is no other reference to the callback, it disappears. Thus you can only use a lambda if it is assigned to a variable or some other reference is kept to it outside of event.