insertItem method
inherited
Insert an item at index
and start an animation that will be passed
to AnimatedGrid.itemBuilder or AnimatedList.itemBuilder when the item
is visible.
This method's semantics are the same as Dart's List.insert method: it
increases the length of the list of items by one and shifts
all items at or after index
towards the end of the list of items.
Implementation
void insertItem(int index, { Duration duration = _kDuration }) {
_sliverAnimatedMultiBoxKey.currentState!.insertItem(index, duration: duration);
}