event = self.source.event
if event is None:
+ if len(self.downstream_elements) and self.downstream_elements[0].visible:
+ self.downstream_elements[0].visible = False
return None
+ if len(self.downstream_elements) and not self.downstream_elements[0].visible:
+ self.downstream_elements[0].visible = True
+
now = int(time())
start_time = event.getBeginTime()
duration = event.getDuration()