Dart APIunself_componentUnselfSliverNavigationBarpadding padding property Null safety EdgeInsetsDirectional? padding final Implementation final EdgeInsetsDirectional? padding; unself_component unself_component UnselfSliverNavigationBar padding property UnselfSliverNavigationBar class Constructors UnselfSliverNavigationBar Properties automaticallyImplyLeading automaticallyImplyTitle backgroundColor border brightness hashCode heroTag key largeTitle leading middle opaque padding previousPageTitle runtimeType stretch trailing transitionBetweenRoutes Methods createElement createState debugDescribeChildren debugFillProperties noSuchMethod toDiagnosticsNode toString toStringDeep toStringShallow toStringShort Operators operator ==