createDelegate static method Null safety

SliverGridDelegateWithFixedCrossAxisCount createDelegate(
  1. BoxConstraints constraints,
  2. int crossAxisCount,
  3. double childSize,
  4. {Axis scrollDirection = Axis.vertical,
  5. double mainAxisSpacing = 0,
  6. double crossAxisSpacing = 0}
)

Create silver grid delegate. Note: Use LayoutBuilder for BoxConstraints.