Sizing AbsolutePanels to 100%

I want an AbsolutePanel to fill a containing widget. I understand it
will not do this automatically, but is there a way for it to get the
dimensions of its parent?

For example, I've created a Composite widget that is primarily a fancy
AbsolutePanel. Can I override some sizing function to calculate my
own dimensions?

I've been searching for answers for this for quite a while - sorry if
this is duplicate information!

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