ClipRectLayer constructor

ClipRectLayer({@required Rect clipRect, Clip clipBehavior: Clip.hardEdge })

Creates a layer with a rectangular clip.

The clipRect property must be non-null before the compositing phase of the pipeline.

Implementation 

ClipRectLayer({ @required Rect clipRect, Clip clipBehavior = Clip.hardEdge }) :
      _clipRect = clipRect, _clipBehavior = clipBehavior,
      assert(clipBehavior != null), assert(clipBehavior != Clip.none);