Dart APIunself_componentUnSliverArtBarisImmersive isImmersive property Null safety bool isImmersive final Implementation final bool isImmersive; unself_component unself_component UnSliverArtBar isImmersive property UnSliverArtBar class Constructors UnSliverArtBar Properties action background description emoji hashCode isImmersive key leading name runtimeType trailing Methods createElement createState debugDescribeChildren debugFillProperties noSuchMethod toDiagnosticsNode toString toStringDeep toStringShallow toStringShort Operators operator ==