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How can I obtain the reordered data order？

I create cube widget list by ReorderableStaggeredScrollViewGridItem, and use ReorderableStaggeredScrollView.grid to wrap items. Now, I want to know how get reordered cube order? for example, my cubes keys is 1,2,3, when i drag 2 behind to 3, I how to get 1,3,2 ? Hope you can see and answer me, thanks!! Here is my code:

List<ReorderableStaggeredScrollViewGridItem> items = List.generate(
      widget.cubes.length,
          (index) => ReorderableStaggeredScrollViewGridItem(
        key: ValueKey(index.toString()),
        mainAxisCellCount: widget.cubes[index].definition.height.length,
        crossAxisCellCount: widget.cubes[index].definition.width.length,
        widget: widget.cubes[index],
      ),
    );

    return Obx(() {
      return ReorderableStaggeredScrollView.grid(
        enable: (widget.dragEnabled ?? RxBool(false)).value,
        padding: EdgeInsets.all(widget.padding),
        scrollDirection: Axis.vertical,
        physics: const BouncingScrollPhysics(),
        crossAxisCount: widget.crossAxisCount,
        isLongPressDraggable: false,
        draggingWidgetOpacity: 0.6,
        children: items,
      );
    });

i have error when using method onAccept

type '(ReorderableStaggeredScrollViewGridItem?, ReorderableStaggeredScrollViewGridItem, bool) =>void' is not a subtype of type '((ReorderableStaggeredScrollViewListItem?,ReorderableStaggeredScrollViewListItem, bool) => void)?' in type cast

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