SliverGeometry constructor

const SliverGeometry({double scrollExtent: 0.0, double paintExtent: 0.0, double paintOrigin: 0.0, double layoutExtent, double maxPaintExtent: 0.0, double maxScrollObstructionExtent: 0.0, double hitTestExtent, bool visible, bool hasVisualOverflow: false, double scrollOffsetCorrection, double cacheExtent })

Creates an object that describes the amount of space occupied by a sliver.

If the layoutExtent argument is null, layoutExtent defaults to the paintExtent. If the hitTestExtent argument is null, hitTestExtent defaults to the paintExtent. If visible is null, visible defaults to whether paintExtent is greater than zero.

The other arguments must not be null.

Implementation 

const SliverGeometry({
  this.scrollExtent = 0.0,
  this.paintExtent = 0.0,
  this.paintOrigin = 0.0,
  double layoutExtent,
  this.maxPaintExtent = 0.0,
  this.maxScrollObstructionExtent = 0.0,
  double hitTestExtent,
  bool visible,
  this.hasVisualOverflow = false,
  this.scrollOffsetCorrection,
  double cacheExtent,
}) : assert(scrollExtent != null),
     assert(paintExtent != null),
     assert(paintOrigin != null),
     assert(maxPaintExtent != null),
     assert(hasVisualOverflow != null),
     assert(scrollOffsetCorrection != 0.0),
     layoutExtent = layoutExtent ?? paintExtent,
     hitTestExtent = hitTestExtent ?? paintExtent,
     cacheExtent = cacheExtent ?? layoutExtent ?? paintExtent,
     visible = visible ?? paintExtent > 0.0;