itemExtent property

double itemExtent
override

The main-axis extent of each item.

Implementation 

@override
double get itemExtent => _itemExtent;
void itemExtent= (double value)

Implementation 

set itemExtent(double value) {
  assert(value != null);
  if (_itemExtent == value)
    return;
  _itemExtent = value;
  markNeedsLayout();
}