sdd_skew.dart

/// Animates the skew of transformed widget.
class SkewTransition extends AnimatedWidget {
  /// Creates a skew transition.
  ///
  /// The [skew] argument must not be null.
  const SkewTransition({
    Key key,
    @required Animation<double> skew,
    this.child,
  }) : super(key: key, listenable: skew);

  /// The animation that controls the skew of the child.
  Animation<double> get skew => listenable;

  /// The widget below this widget in the tree.
  ///
  /// {@macro flutter.widgets.child}
  final Widget child;

  @override
  Widget build(BuildContext context) {
    final double skewValue = skew.value;
    final Matrix4 transform = new Matrix4.skewX(skewValue);
    return new Transform(
      transform: transform,
      child: child,
    );
  }
}