flex invalidation mechanism

Adobe help document said, "When a component calls an invalidation method, it signals to Flex that the component must be updated. 开发者_如何学编程When multiple components call invalidation methods, Flex coordinates updates so that they all occur together during the next screen update."

So what does "next screen update" mean? I am confused about the invalidation, does it mean the Flex will execute measure(), commitProperties(), updateDisplayList() period where marks invalidateSize(), invalidateProperties(), invalidateDisplayList()？

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My answer to this question has the links you are looking for. Read up on the elastic racetrack and check out Deepa's presentation on the flex lifecycle.