AnimatedOpacity constructor

const AnimatedOpacity({Key key, Widget child, @required double opacity, Curve curve: Curves.linear, @required Duration duration })

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({
  Key key,
  this.child,
  @required this.opacity,
  Curve curve = Curves.linear,
  @required Duration duration,
}) : assert(opacity != null && opacity >= 0.0 && opacity <= 1.0),
     super(key: key, curve: curve, duration: duration);