AnimatedPadding constructor

AnimatedPadding({Key key, @required EdgeInsetsGeometry padding, Widget child, Curve curve: Curves.linear, @required Duration duration })

Creates a widget that insets its child by a value that animates implicitly.

The padding, curve, and duration arguments must not be null.

Implementation 

AnimatedPadding({
  Key key,
  @required this.padding,
  this.child,
  Curve curve = Curves.linear,
  @required Duration duration,
}) : assert(padding != null),
     assert(padding.isNonNegative),
     super(key: key, curve: curve, duration: duration);