AnimatedSliverMultiBoxAdaptorElement constructor
AnimatedSliverMultiBoxAdaptorElement()
Creates an element that lazily builds children for the given widget with support for animations and reordering.
Implementation
AnimatedSliverMultiBoxAdaptorElement(
AnimatedSliverMultiBoxAdaptorWidget widget)
: super(widget) {
_childElements[null] = SplayTreeMap<int, Element?>();
}