createChild method
- @override
override
Creates a new child at the given index and updates it to the child list
of RenderListWheelViewport. If no child corresponds to index, then do
nothing.
It is possible to create children with negative indices.
Implementation
@override
void createChild(int index, { @required RenderBox after }) {
owner.buildScope(this, () {
final bool insertFirst = after == null;
assert(insertFirst || _childElements[index - 1] != null);
final Element newChild =
updateChild(_childElements[index], retrieveWidget(index), index);
if (newChild != null) {
_childElements[index] = newChild;
} else {
_childElements.remove(index);
}
});
}