startItemDragReorder method Null safety

void startItemDragReorder(
  1. {required int index,
  2. required PointerDownEvent event,
  3. required MultiDragGestureRecognizer recognizer}

Initiate the dragging of the item at index that was started with the pointer down event.

The given recognizer will be used to recognize and start the drag item tracking and lead to either an item reorder, or a canceled drag. The list will take ownership of the returned recognizer and will dispose it when it is no longer needed.

Most applications will not use this directly, but will wrap the item (or part of the item, like a drag handle) in either a ReorderableDragStartListener or ReorderableDelayedDragStartListener which call this for the application.


void startItemDragReorder({
  required int index,
  required PointerDownEvent event,
  required MultiDragGestureRecognizer recognizer,
}) {
  _sliverReorderableListKey.currentState!.startItemDragReorder(index: index, event: event, recognizer: recognizer);