Flex Component Lifecycle: validateNow, validateDisplayList, invalidateDisplalList, commitProperties, etc

I am extending VBox to make a Calendar component. What method should I override to add the code to dr开发者_JS百科aw itself? What is the difference between all these methods? Is there something I should be putting in each one, or is there a specific method I can just override, add my drawing code, and have it work?

Thanks!

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This white-paper is perhaps the best source of information I have seen on the subject.

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Deepa's MAX 2008 talk was easily the best and most easily understanding presentation on the topic. It shows exactly how to write components properly in Flex 3.

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I also recommend this article:

http://maohao.wordpress.com/2009/02/02/6-steps-in-creating-custom-uicomponent-in-flex-halo-framework/

Briefly, if you're doing graphics operations to draw, you'll want to use override updateDisplayList() and call invalidateDisplayList() as necessary; if you're using subcomponents, you'll use commitProperties()/invalidateProperties(). If you're dynamically sized, you'll need measure() and invalidateSize().

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Override updateDisplayList method of UIComponent and do your drawing in it. Use the component's unscaledWidth and unscaledHeight as the bounds for drawing.

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From Adobe Flex 3 Live Docs Advanced Visual Components in ActionScript - great source.