onScroll

Handles every pointer scroll event that hits this modifier's laid-out bounds.

this chain with one appended active scroll handler.

callback

callback receiving the typed event and modifier-local position and deciding propagation.

when callback fails during dispatch.

Runs action for every pointer scroll event that hits this modifier and consumes the event.

this chain with one appended consuming scroll handler.

action

synchronous action invoked on the owning tree thread.

when action fails during dispatch.