Dart APIunself_componentUnSheettransitionBackgroundColor transitionBackgroundColor property Null safety Color? transitionBackgroundColor final Implementation final Color? transitionBackgroundColor; unself_component unself_component UnSheet<T> transitionBackgroundColor property UnSheet class Constructors UnSheet Properties animationCurve arguments backgroundColor barrierColor bounce child clipBehavior closeProgressThreshold duration elevation enableDrag expand hashCode isDismissible key name overlayStyle previousRouteAnimationCurve restorationId runtimeType secondAnimation settings shadow shape topRadius transitionBackgroundColor useRootNavigator Methods canUpdate createRoute noSuchMethod toString Operators operator ==