ReadonlyxLast seen X coordinate.
ReadonlyyLast seen Y coordinate.
Readonlyistrue while a primary button is held.
ReadonlyonFires on every pointermove.
ReadonlyonFires on pointerdown.
ReadonlyonFires on pointerup.
ReadonlydestroyRemove listeners and detach. Idempotent.
Normalized pointer (mouse/touch/pen) state.