class Focusable

bool focused

Array<(bool) => void> focusHandlers_

Array<int> focusTokens_

bool tabStop_

changed() -> void

cursorPos() -> Point | None

isTabStop() -> bool

offFocusChange(int t) -> void

onFocusChange((bool) => void h) -> int

setFocused(bool value) -> void

setTabStop(bool on) -> void