onFocusedBoundsChanged

fun Modifier.onFocusedBoundsChanged(onPositioned: (LayoutCoordinates?) -> Unit): Modifier

Calls onPositioned whenever the bounds of the currently-focused area changes. If a child of this node has focus, onPositioned will be called immediately with a non-null LayoutCoordinates that can be queried for the focused bounds, and again every time the focused child changes or is repositioned. When a child loses focus, onPositioned will be passed null.

When an event occurs, it is bubbled up from the focusable node, so the nearest parent gets the event first, and then its parent, etc.

Note that there may be some cases where the focused bounds change but the callback is not invoked, but the last LayoutCoordinates will always return the most up-to-date bounds.