BeforeDropCallBack<T extends DraggableItem> typedef
BeforeDropCallBack<T extends DraggableItem> =
Future<bool> Function({T? fromItem, int fromSlotIndex, T? toItem, int toSlotIndex})
Implementation
typedef Future<bool> BeforeDropCallBack<T extends DraggableItem>({
T? fromItem,
int fromSlotIndex,
T? toItem,
int toSlotIndex,
});