Compose Modifier
handwritingDetector
Android
```kotlin
fun Modifier.handwritingDetector(callback: () -> Unit) =
if (isStylusHandwritingSupported) {
this.stylusHoverIcon(handwritingPointerIcon, false, HandwritingBoundsExpansion)
.then(HandwritingDetectorElement(callback))
} else {
this
}
```
Configures an element to act as a handwriting detector which detects stylus handwriting and
delegates handling of the recognised text to another element.
Stylus movement on the element will start a handwriting session, and trigger the `callback`. The
`callback` implementation is expected to show and focus a text input field with a
`handwritingHandler` modifier which can handle the recognized text from the handwriting session.
A common use case is a component which looks like a text input field but does not actually
support text input itself, and clicking on this fake text input field causes a real text input
field to be shown. To support handwriting initiation in this case, this modifier can be applied
to the fake text input field to configure it as a detector, and a `handwritingHandler` modifier
can be applied to the real text input field. The `callback` implementation is typically the same
as the `onClick` implementation for the fake text field's `clickable` modifier, which shows and
focuses the real text input field.
This function returns a no-op modifier on API levels below Android U (34) as stylus handwriting
is not supported.
#### Parameters
| | |
| --- | --- |
| callback | a callback which will be triggered when stylus handwriting is detected |