OnMouseWheelMoved - Forward/Backward?

This may be an elementary question but how can I tell if the mouse-wheel is being moved in a forward or backward motion (for a scrollbar)?
I checked the JavaFX API but I didn't see anything specific on this,... or I've completely missed it.
Thank you.

Fantastic.
I actually saw that little snippet of code but didn't think to implement it as I thought it was unidirectional. I guess the onMouseWheel move event automatically detects whether or not it's moving forward (1) or backwards (-1).
Thanks PhiLho.

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