RenderSliverGrid constructor
Creates a sliver that contains multiple box children that whose size and position are determined by a delegate.
The childManager and gridDelegate arguments must not be null.
Implementation
RenderSliverGrid({
@required RenderSliverBoxChildManager childManager,
@required SliverGridDelegate gridDelegate,
}) : assert(gridDelegate != null),
_gridDelegate = gridDelegate,
super(childManager: childManager);