Dart APIunself_componentUnselfNavigationBarautomaticallyImplyMiddle automaticallyImplyMiddle property Null safety bool automaticallyImplyMiddle final Implementation final bool automaticallyImplyMiddle; unself_component unself_component UnselfNavigationBar automaticallyImplyMiddle property UnselfNavigationBar class Constructors UnselfNavigationBar Properties automaticallyImplyLeading automaticallyImplyMiddle backgroundColor border brightness hashCode heroTag key leading middle padding preferredSize previousPageTitle runtimeType trailing transitionBetweenRoutes Methods createElement createState debugDescribeChildren debugFillProperties noSuchMethod shouldFullyObstruct toDiagnosticsNode toString toStringDeep toStringShallow toStringShort Operators operator ==