front end - How can I get the box size of a BoxObject?

I've often wanted to set the size of an interface element to something like Full - 50, so as to not over-constrain box sizes.

One approach to this would be to simply use a Dynamic[boxsize - 50] as my ImageSize.

Unfortunately, for boxes that information isn't possible to extract by normal means.

I've always resorted to hacks and workarounds, but I don't see what that info shouldn't be possible to extract from the FE.

In digging I found FrontEnd`GetBoundingBoxSizePacket, but it always returns one of two things. Either it gives:

FrontEndExecute[FrontEnd`GetBoundingBoxSizePacket@EvaluationCell[]]

{{34., 13., 7.}}

FrontEndExecute[FrontEnd`GetBoundingBoxSizePacket@1]

$Failed

No matter what FE object I pass to it, it only ever returns one size.

Does anyone know can I get the size of a BoxObject?

Comments

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