---
title: ScrollWheelEventCallback
framework: kernel
role: symbol
role_heading: Type Alias
path: kernel/scrollwheeleventcallback
---

# ScrollWheelEventCallback

## Declaration

```occ
typedef void (*ScrollWheelEventCallback)(OSObject *target, short deltaAxis1, short deltaAxis2, short deltaAxis3, IOFixed fixedDelta1, IOFixed fixedDelta2, IOFixed fixedDelta3, SInt32 pointDelta1, SInt32 pointDelta2, SInt32 pointDelta3, SInt32 options, AbsoluteTime ts, OSObject *sender, void *refcon);
```