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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Detect window switches?
Date: Thu, 26 Sep 2013 21:37:25 +0300
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> From: Dan Espen <despen@verizon.net>
> Date: Thu, 26 Sep 2013 14:22:15 -0400
> 
> My mode line changes color when a buffer changes from active/inactive.
> Isn't that what the OP is looking for?

That's done on the C level, and Lisp programs cannot hook into this.