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Asked: 2026-05-26T05:24:53+00:00

I’m working with mouse events, specifically OnMouseWheel . Many code samples refer to distance

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I’m working with mouse events, specifically OnMouseWheel. Many code samples refer to distance the view changes (or zoom f.i. in 3D application) as Distance = Sign(WheelDelta)*Constant or Distance = WheelDelta / WHEEL_DELTA or something of that kind – assuming that WheelDelta is always a multiple of 120 (WHEEL_DELTA constant = 120).

I already found that in touch interfaces / tablets input may depend on scrolling length.

I was wondering why Microsoft has set default WheelDelta to 120, why not 100 or 10 or anything else? In what other cases wheel delta may be something different from 120?

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1 Answer

  1. Editorial Team

    WHEEL_DELTA is not fixed anymore to 120. As I understand it this constant was chosen to allow for finer resolutions in the future, which obviously is NOW.

    See this article from MSDN

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