---
title: prefersTrackingUntilMouseUp
framework: appkit
role: symbol
role_heading: Type Property
path: appkit/nsslidercell/preferstrackinguntilmouseup
---

# prefersTrackingUntilMouseUp

Returns a Boolean value indicating whether the NSSliderCell continues to track the pointer until the next mouse up.

## Declaration

```swift
class var prefersTrackingUntilMouseUp: Bool { get }
```

## Return Value

Return Value true if the NSSliderCell continues to track the pointer even after it leaves the cell’s tracking rectangle; otherwise, false. By default, this method returns true.

## Discussion

Discussion If this method returns true, users retain control of the knob until they release the mouse button, even if they drag the pointer to the other side of the screen. You should not call this method explicitly. Override it if you create a subclass of NSSliderCell that should track the mouse differently.

## See Also

### Managing Cell Behavior

- [altIncrementValue](appkit/nsslidercell/altincrementvalue.md)
- [trackRect](appkit/nsslidercell/trackrect.md)