updateFocusState method
Implementation
void updateFocusState(bool value, {bool? focusVisible}) {
final bool changed = _setPseudoState(_pseudoFocus, value);
final bool visible = value && (focusVisible ?? ownerDocument.shouldShowFocusVisible);
_setPseudoState(_pseudoFocusVisible, visible);
if (changed) {
_updateFocusWithinAncestors(value);
}
}