Generic Function Handle-Mouse-Wheel (1 method)
(
handle-mouse-wheel < osd-element > < z > < zrel > < x > < y > )
When a GUI element needs to respond to wheel motion, implement this.
The x and y arguments are the relative location to the element,
or nil if it's the root element.
Method Summary
| handle-mouse-wheel < osd-button > < t > < t > < t > < t > |
