Event XbpScrollBar():wheel Foundation

Mouse wheel is activated.

:wheel := {| aPos, aWheel, self | ... }
:wheel( <aPos>, <aWheel> ) --> self
xbeM_Wheel (1048599)
<aPos> is an array containing two elements { nX, nY } that specify the current position of the mouse pointer. By default, the coordinates are relative to the lower left corner of the scroll bar object receiving the message.
<aWheel> is an array with five elements {nKeyMask, nDistance, nLines, nOffset, nLinesToScroll}.
The first element (nKeyMask) is a numeric value indicating special keys pressed while the user rotates the mouse wheel. The value of this element is either 0 (no special key is pressed) or the result of one or more of the following #define constants listed in XBP.CH.
Constants for key states
Constant Description
XBP_MK_LBUTTON Left mouse button is pressed
XBP_MK_MBUTTON Middle mouse button is pressed
XBP_MK_RBUTTON Right mouse button is pressed
XBP_MK_CONTROL Ctrl key is pressed
XBP_MK_SHIFT Shift key is pressed

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