---
title: stageTransition
framework: appkit
role: symbol
role_heading: Instance Property
path: appkit/nsevent/stagetransition
---

# stageTransition

The transition value for the stage of a pressure gesture event.

## Declaration

```swift
var stageTransition: CGFloat { get }
```

## Discussion

Discussion This property is specifically intended to provide a value for the transition animation between the stages of a pressure gesture event. Gesture events of type NSEvent.EventType.pressure go through stages, and transitions occur between these stages. This property indicates a transition value between the current stage and the next or prior stage. This value is distinct from pressure. It immediately resets to 0 as soon as a stage transition occurs. However, this value does not then immediately begin to fluctuate. The value only starts to change as a new stage begins to approach. It then continues to rise or fall throughout the transition, until that new stage is reached. As pressure increases for the gesture and a new stage approaches, this property provides a value between 0 and 1, indicating the approach of the next stage. When pressure is reduced for the gesture and a new stage is approached, this property provides a value between 0 and -1, indicating the approach of the current stage’s release.

## See Also

### Related Documentation

- [NSEvent.EventType](appkit/nsevent/eventtype.md)
- [NSEvent.EventType.pressure](appkit/nsevent/eventtype/pressure.md)

### Getting pressure information

- [pressure](appkit/nsevent/pressure.md)
- [stage](appkit/nsevent/stage.md)
- [pressureBehavior](appkit/nsevent/pressurebehavior-swift.property.md)
- [NSEvent.PressureBehavior](appkit/nsevent/pressurebehavior-swift.enum.md)