Beamer templating - resetting variables at start or end of frame

Question

For a beamer theme, I'd like to provide two different kinds of frame titles. A normal one, plus one with an image background.

As far as I can see the best method to do this is to overload the frametitle template, such that when certain data is available, then we choose the image version.

Since this data has to be global, we also need methods for resetting them either at the end of each frame or at the beginning.

If we look in beamerbaseframe.sty, this is exactly what beamer does with, say, \insertframetitle, it is reset to empty in the end part of the definition of the beamer@frameslide environment.

So my question is, how can we add our own variable resetting to this? (which would not be nullifying macros, but resetting them to default values.

Any ideas?

Hmm, come to think about it. Since the variables are only needed in the frametitle template, what is keeping me from ending the template by resetting these variables. — daleif, Jul 28 '15 at 08:14
Did you solve your question in the mean time? Otherwise would you like to include a small example? — samcarter_is_at_topanswers.xyz, Aug 01 '16 at 17:26
@samcarter I do have some functioning code, but very very ugly — daleif, Aug 01 '16 at 17:31
Maybe you could add what you understand with "overload the frametitle template, such that when certain data is available" to make the question clearer? At least for me, I think I don't understand the question. — samcarter_is_at_topanswers.xyz, Aug 01 '16 at 19:32

Beamer templating - resetting variables at start or end of frame

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