def show(self, view_manager, give_focus=True):
#Register the metadata callbacks if needed
if self.__metadata_callbacks is None:
self.__metadata_callbacks = MetadataUpdateCallbacks()
session = view_manager.get_var('session')
session.add_callbacks(self.__metadata_callbacks)
if not self.is_visible() or not self.__list_rendered:
BaseListContainerView.show(self, view_manager, give_focus)
elif self.__list_rendered:
self._update_metadata(view_manager)
def update_unavailable_tracks(self, view_manager):
#Try acquiring the update lock
if self.__update_lock.acquire(False):
try:
wait_time = 10
event = threading.Event()
session = view_manager.get_var('session')
m_cb = MetadataUpdateCallbacks(event)
session.add_callbacks(m_cb)
self.__update_unavailable = True
while self.__update_unavailable and wait_time > 0:
wait_time -= 1
event.wait(1)
event.clear()
if self._update_metadata(view_manager) == 0:
self.__update_unavailable = False
finally:
session.remove_callbacks(m_cb)
self.__update_lock.release()
