+ if x.visible:
+ x.hide()
+ self.timer.stop()
+
+ def calcVisibility(self):
+ b = self.source.boolean
+ if b is None:
+ return True
+ b ^= self.invert
+ return b
+
+ def changed(self, what):
+ vis = self.calcVisibility()
+ if self.blink:
+ if vis:
+ self.startBlinking()
+ else:
+ self.stopBlinking()
+ else:
+ for x in self.downstream_elements:
+ x.visible = vis
+
+ def connectDownstream(self, downstream):
+ Converter.connectDownstream(self, downstream)
+ vis = self.calcVisibility()
+ if self.blink:
+ if vis:
+ self.startBlinking()
+ else:
+ self.stopBlinking()
+ else:
+ downstream.visible = self.calcVisibility()
+
+ def destroy(self):
+ if self.timer:
+ self.timer.callback.remove(self.blinkFunc)