Dart APIunself_componentUnselfNavigationBarautomaticallyImplyLeading automaticallyImplyLeading property Null safety bool automaticallyImplyLeading final Implementation final bool automaticallyImplyLeading; unself_component unself_component UnselfNavigationBar automaticallyImplyLeading 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 ==