Is there a callback for when autoadvance completes on a matrix question?

I have a Matrix question that is autoadvancing with the carousel mode.
While the blue bar shows progress, its not always clear to users that they have 'completed' all the questions. So I would like to have the 'next' button change text when the user finishes the autoadvancing. e.g. it always says 'Skip', and then when the carousel is done the text changes to "Continue" or "Finish".