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# CGEventField.scrollWheelEventFixedPtDeltaAxis1

Key to access a field that contains scrolling data. The scrolling data represents a line-based or pixel-based change in vertical position since the last scrolling event from a Mighty Mouse scroller or a single-wheel mouse scroller. The scrolling data uses a fixed-point 16.16 signed integer format. For example, if the field contains a value of 1.0, the integer 0x00010000 is returned by `CGEventGetIntegerValueField`. If this key is passed to `CGEventGetDoubleValueField`, the fixed-point value is converted to a double value.

```
case scrollWheelEventFixedPtDeltaAxis1
```

---

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