SliverAnimatedOpacity constructor Null safety

const SliverAnimatedOpacity(
  1. {Key? key,
  2. Widget? sliver,
  3. required double opacity,
  4. Curve curve = Curves.linear,
  5. required Duration duration,
  6. VoidCallback? onEnd,
  7. bool alwaysIncludeSemantics = false}
)

Creates a widget that animates its opacity implicitly.

The opacity argument must not be null and must be between 0.0 and 1.0, inclusive. The curve and duration arguments must not be null.

Implementation

const SliverAnimatedOpacity({
  super.key,
  this.sliver,
  required this.opacity,
  super.curve,
  required super.duration,
  super.onEnd,
  this.alwaysIncludeSemantics = false,
}) : assert(opacity != null && opacity >= 0.0 && opacity <= 1.0);