GridView.custom constructor Null safety

const GridView.custom(
  1. {Key? key,
  2. Axis scrollDirection = Axis.vertical,
  3. bool reverse = false,
  4. ScrollController? controller,
  5. bool? primary,
  6. ScrollPhysics? physics,
  7. bool shrinkWrap = false,
  8. EdgeInsetsGeometry? padding,
  9. required SliverGridDelegate gridDelegate,
  10. required SliverChildDelegate childrenDelegate,
  11. double? cacheExtent,
  12. int? semanticChildCount,
  13. DragStartBehavior dragStartBehavior = DragStartBehavior.start,
  14. ScrollViewKeyboardDismissBehavior keyboardDismissBehavior = ScrollViewKeyboardDismissBehavior.manual,
  15. String? restorationId,
  16. Clip clipBehavior = Clip.hardEdge}
)

Creates a scrollable, 2D array of widgets with both a custom SliverGridDelegate and a custom SliverChildDelegate.

To use an IndexedWidgetBuilder callback to build children, either use a SliverChildBuilderDelegate or use the GridView.builder constructor.

The gridDelegate and childrenDelegate arguments must not be null.

Implementation

const GridView.custom({
  Key? key,
  Axis scrollDirection = Axis.vertical,
  bool reverse = false,
  ScrollController? controller,
  bool? primary,
  ScrollPhysics? physics,
  bool shrinkWrap = false,
  EdgeInsetsGeometry? padding,
  required this.gridDelegate,
  required this.childrenDelegate,
  double? cacheExtent,
  int? semanticChildCount,
  DragStartBehavior dragStartBehavior = DragStartBehavior.start,
  ScrollViewKeyboardDismissBehavior keyboardDismissBehavior = ScrollViewKeyboardDismissBehavior.manual,
  String? restorationId,
  Clip clipBehavior = Clip.hardEdge,
}) : assert(gridDelegate != null),
     assert(childrenDelegate != null),
     super(
       key: key,
       scrollDirection: scrollDirection,
       reverse: reverse,
       controller: controller,
       primary: primary,
       physics: physics,
       shrinkWrap: shrinkWrap,
       padding: padding,
       cacheExtent: cacheExtent,
       semanticChildCount: semanticChildCount,
       dragStartBehavior: dragStartBehavior,
       keyboardDismissBehavior: keyboardDismissBehavior,
       restorationId: restorationId,
       clipBehavior: clipBehavior,
     );