Draggable buildRecursiveStack(List<PCard> cards, int depth) {
  if (cards.length == 0) {
    return null;
  }
  PCard card = cards.first;
  List<PCard> ncards = new List<PCard>.from(cards);
  ncards.removeAt(0);

  return Draggable(
      childWhenDragging: Container(),
      feedback: Container(
        height: 300,
        width: 50,
        child: Stack(
          children: cards.map((card) {
            return Positioned(
                top: 20.0 * depth + 20.0 * cards.indexOf(card),
                child: Container(
                    decoration: BoxDecoration(
                      borderRadius: BorderRadius.circular(4.0),
                      color: Colors.white,
                      border: Border.all(color: Colors.black),
                    ),
                    child: Image.asset(
                      card.AsettName,
                      scale: 6,
                    )));
          }).toList(),
        ),
      ),
      child: Stack(children: () {
        List<Widget> a = [
          Positioned(
              top: 20.0 * depth,
              child: Container(
                  decoration: BoxDecoration(
                    borderRadius: BorderRadius.circular(4.0),
                    color: Colors.white,
                    border: Border.all(color: Colors.black),
                  ),
                  child: Image.asset(
                    card.AsettName,
                    scale: 6,
                  ))),
          buildRecursiveStack(ncards, depth + 1)
        ];
        a.removeWhere((value) => value == null);
        return a;
      }()));
}