Roll constructor

const Roll({ Key? key, Gradient? gradient, Crinkle crinkle = Crinkle.smooth, Widget? child, })

Provide a Roll for Foil.

Sharing Gradients

A gradient in an ancestral Roll may be provided to a descendent Foil as its Foil.gradient if one is not explicitly perscribed in the Foil.

• If neither an ancestral Roll nor a Foil dictates its own gradient, then the default is Foils.rainbows.linear.
• A descendent that provides its own Foil.gradient will override this gradient.

Animations

This Roll can also serve to provide animation properties to a descendent Foil, regardless if its serving its gradient.

The crinkle parameter defaults to Crinkle.smooth which is not animated (although each Roll has its own AnimationController). A Crinkle dictates speed, intensity, and directionality of animation.

• Crinkle.twinkling is a very slow moving preset
• Crinkle.vivacious is a highly-animated preset
• Build your own or opt to Crinkle.copyWith a preset
  • Crinkle.scalar property can be used to invert, scale, or negate axes
  • Crinkle.period determines the loop Duration

A Literally Shared Gradient

TODO:

Ideally a Roll will allow the definition of a swath of space, dictated by the tree underneath it, to shade with a single larger Gradientfrom which any descendent Foil widgets could be offset/masked.

Implementation

const Roll({
  Key? key,
  this.gradient,
  this.crinkle = Crinkle.smooth,
  this.child,
}) : super(key: key);