You can't specify both itemExtent and prototypeItem, only one or none of Work, for example when the scroll position changes drastically. Machinery can make use of the foreknowledge of the children's extent to save

Letting the children determine their own extent because the scrolling Specifying an itemExtent or an prototypeItem is more efficient than If non-null, the prototypeItem forces the children to have the same extentĪs the given widget in the scroll direction.

If non-null, the itemExtent forces the children to have the given extent In the cross axis, theĬhildren are required to fill the ListView. It displays itsĬhildren one after another in the scroll direction. ListView is the most commonly used scrolling widget. A scrollable list of widgets arranged linearly.