Scripting in Resolve - Subscribing to events

Is there any way for a lua or python function inside a script to be triggered by an action in Resolve?

I'm looking to write a script which would cause a streamdeck to automatically change profile based on the currently selected page. An option would be to poll

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Resolve.GetCurrentPage()

every 500ms, or something along those lines, however it seems like a pretty inelegant and hacky solution, which may or may not have a detrimental effect on performance.

Is there a more elegant way of doing things?

No, that's the only solution for what you're trying to achieve.

Looping Resolve.GetCurrentPage() will not be sufficient though. Assuming this is an external script and you want to run it as a process you will need to make a resolve instance each time Resolve restarts. You'd need something like

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while true:
    try resolve.GetProjectManager():
        page = resolve.GetCurrentPage()
    except:
        resolve = get_your_resolve_instance()
        page = resolve.GetCurrentPage()
    time.sleep(.5)

You'll need to experiment to fins a sleep interval that's optimal. Of course, try to be more specific with the exception catching than the blanket "except" I have up there.

I can confirm Igor's explanation. I created a plugin for the Touch Portal app to control & monitor Resolve. The only solution to keep track of the selected page was similar to Igor's, and in fact GetCurrentPage is only a recent addition to the API. In my first attempt, before the call was added, I was monitoring the Resolve log file to recognise when the page changed ("Main view page is changed to nn" where "nn" is the number of the page). What a relief when one of the Beta releases introduced the new feature. I think I'm using a 500ms loop.