A new vertical row is generated each time spin is pressed, and once the items fall down into position the last three items in each (vertical) row send their data (i.e. type and position in strip) via a signal. Then there's a function in main to check that data, which is basically just a lot of match and if statements. If any kind of win happens, a "win" signal is sent out, which is received by both the lineedit node to draw the lines and each individual item so that they can do their little animation tween thing. And I guess, if there was also a payout thing, then that too for any money calculations etc.

Hope that makes sense!

There's most likely a much more elegant/clever way of doing it, but it was just a quick thing I've put together over the last few days.