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# deltaDidChangeHandler

The block that the profile calls when the element’s input changes.

```
var deltaDidChangeHandler: ((any GCPhysicalInputElement, any GCRelativeInput, Float) -> Void)? { get set }
```

## Discussion

The block’s parameters are:

- `element`: The element whose input changes.
- `input`: The input object that represents the relative or delta value.
- `delta`: The amount that the input changed since the last time the profile called this block.

---

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