---
title: CGEventCreateScrollWheelEvent
framework: coregraphics
role: symbol
role_heading: Function
path: coregraphics/cgeventcreatescrollwheelevent
---

# CGEventCreateScrollWheelEvent

Returns a new Quartz scrolling event.

## Declaration

```occ
extern CGEventRefCGEventCreateScrollWheelEvent(CGEventSourceRef source, CGScrollEventUnit units, uint32_t wheelCount, int32_t wheel1, ...);
```

## Parameters

Parameters Returns A new scrolling event, or NULL if the event could not be created. When you no longer need the event, you should release it using the function CFRelease. Discussion This function allows you to create a scrolling event and customize the event before posting it to the event system.

## See Also

### Functions

- [CGAcquireDisplayFadeReservation(_:_:)](coregraphics/cgacquiredisplayfadereservation(_:_:).md)
- [CGAssociateMouseAndMouseCursorPosition(_:)](coregraphics/cgassociatemouseandmousecursorposition(_:).md)
- [CGBeginDisplayConfiguration(_:)](coregraphics/cgbegindisplayconfiguration(_:).md)
- [CGCancelDisplayConfiguration(_:)](coregraphics/cgcanceldisplayconfiguration(_:).md)
- [CGCaptureAllDisplays()](coregraphics/cgcapturealldisplays().md)
- [CGCaptureAllDisplaysWithOptions(_:)](coregraphics/cgcapturealldisplayswithoptions(_:).md)
- [CGColorConversionInfoCreateFromList](coregraphics/cgcolorconversioninfocreatefromlist.md)
- [CGCompleteDisplayConfiguration(_:_:)](coregraphics/cgcompletedisplayconfiguration(_:_:).md)
- [CGConfigureDisplayFadeEffect(_:_:_:_:_:_:)](coregraphics/cgconfiguredisplayfadeeffect(_:_:_:_:_:_:).md)
- [CGConfigureDisplayMirrorOfDisplay(_:_:_:)](coregraphics/cgconfiguredisplaymirrorofdisplay(_:_:_:).md)
- [CGConfigureDisplayMode(_:_:_:)](coregraphics/cgconfiguredisplaymode(_:_:_:).md)
- [CGConfigureDisplayOrigin(_:_:_:_:)](coregraphics/cgconfiguredisplayorigin(_:_:_:_:).md)
- [CGConfigureDisplayStereoOperation(_:_:_:_:)](coregraphics/cgconfiguredisplaystereooperation(_:_:_:_:).md)
- [CGConfigureDisplayWithDisplayMode(_:_:_:_:)](coregraphics/cgconfiguredisplaywithdisplaymode(_:_:_:_:).md)
- [CGContextDrawPDFDocument](coregraphics/cgcontextdrawpdfdocument.md)