prototypeItem property

Widget? prototypeItem
final

If non-null, forces the children to have the same extent as the given widget in the scroll direction.

Specifying an prototypeItem is more efficient than letting the children determine their own extent because the scrolling machinery can make use of the foreknowledge of the children's extent to save work, for example when the scroll position changes drastically.

Implementation

final Widget? prototypeItem;