AnimatedOpacity constructor Null safety

const AnimatedOpacity(
  1. {Key? key,
  2. Widget? child,
  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 AnimatedOpacity({
  super.key,
  this.child,
  required this.opacity,
  super.curve,
  required super.duration,
  super.onEnd,
  this.alwaysIncludeSemantics = false,
}) : assert(opacity != null && opacity >= 0.0 && opacity <= 1.0);