GridView.count constructor Null safety

GridView.count(
  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 int crossAxisCount,
  10. double mainAxisSpacing = 0.0,
  11. double crossAxisSpacing = 0.0,
  12. double childAspectRatio = 1.0,
  13. bool addAutomaticKeepAlives = true,
  14. bool addRepaintBoundaries = true,
  15. bool addSemanticIndexes = true,
  16. double? cacheExtent,
  17. List<Widget> children = const <Widget>[],
  18. int? semanticChildCount,
  19. DragStartBehavior dragStartBehavior = DragStartBehavior.start,
  20. ScrollViewKeyboardDismissBehavior keyboardDismissBehavior = ScrollViewKeyboardDismissBehavior.manual,
  21. String? restorationId,
  22. Clip clipBehavior = Clip.hardEdge}
)

Creates a scrollable, 2D array of widgets with a fixed number of tiles in the cross axis.

Uses a SliverGridDelegateWithFixedCrossAxisCount as the gridDelegate.

The addAutomaticKeepAlives argument corresponds to the SliverChildListDelegate.addAutomaticKeepAlives property. The addRepaintBoundaries argument corresponds to the SliverChildListDelegate.addRepaintBoundaries property. Both must not be null.

See also:

Implementation

GridView.count({
  Key? key,
  Axis scrollDirection = Axis.vertical,
  bool reverse = false,
  ScrollController? controller,
  bool? primary,
  ScrollPhysics? physics,
  bool shrinkWrap = false,
  EdgeInsetsGeometry? padding,
  required int crossAxisCount,
  double mainAxisSpacing = 0.0,
  double crossAxisSpacing = 0.0,
  double childAspectRatio = 1.0,
  bool addAutomaticKeepAlives = true,
  bool addRepaintBoundaries = true,
  bool addSemanticIndexes = true,
  double? cacheExtent,
  List<Widget> children = const <Widget>[],
  int? semanticChildCount,
  DragStartBehavior dragStartBehavior = DragStartBehavior.start,
  ScrollViewKeyboardDismissBehavior keyboardDismissBehavior = ScrollViewKeyboardDismissBehavior.manual,
  String? restorationId,
  Clip clipBehavior = Clip.hardEdge,
}) : gridDelegate = SliverGridDelegateWithFixedCrossAxisCount(
       crossAxisCount: crossAxisCount,
       mainAxisSpacing: mainAxisSpacing,
       crossAxisSpacing: crossAxisSpacing,
       childAspectRatio: childAspectRatio,
     ),
     childrenDelegate = SliverChildListDelegate(
       children,
       addAutomaticKeepAlives: addAutomaticKeepAlives,
       addRepaintBoundaries: addRepaintBoundaries,
       addSemanticIndexes: addSemanticIndexes,
     ),
     super(
       key: key,
       scrollDirection: scrollDirection,
       reverse: reverse,
       controller: controller,
       primary: primary,
       physics: physics,
       shrinkWrap: shrinkWrap,
       padding: padding,
       cacheExtent: cacheExtent,
       semanticChildCount: semanticChildCount ?? children.length,
       dragStartBehavior: dragStartBehavior,
       keyboardDismissBehavior: keyboardDismissBehavior,
       restorationId: restorationId,
       clipBehavior: clipBehavior,
     );