apache-flex - validateProperties() 和 invalidateProperties() 之间的区别

Question

谁能告诉我 validateProperties() 和 invalidateProperties() 有什么区别？

Answer 1

invalidateProperties :

Marks a component so that its commitProperties() method gets called during a later screen update.

Invalidation is a useful mechanism for eliminating duplicate work by delaying processing of changes to a component until a later screen update. For example, if you want to change the text color and size, it would be wasteful to update the color immediately after you change it and then update the size when it gets set. It is more efficient to change both properties and then render the text with its new size and color once.

Invalidation methods rarely get called. In general, setting a property on a component automatically calls the appropriate invalidation method.

validateProperties :

Used by layout logic to validate the properties of a component by calling the commitProperties() method. In general, subclassers should override the commitProperties() method and not this method.

本质上，validate 直接调用 commitProperties，而 invalidate 等待下一帧执行。始终使用无效。