How to watch the desktop

Title: How to watch the desktop

Can someone please tell me how to watch for my window app movement?

Or better yet, to tell me what is the best way to make a widget be refreshed each time it is moved. I have some kind of transparency and thus I need to track where I am, to show what is beneath.

For now, I am using one of those gtk loop functions that gets called each second to refresh my widget, but this is certainly ugly.

Thanks in advance

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