List<String> _list = ["Apple", "Ball", "Cat", "Dog", "Elephant"];

@override
Widget build(BuildContext context) {
  return Scaffold(
    appBar: AppBar(),
    body: ReorderableListView(
      children: _list.map((item) => ListTile(key: Key("${item}"), title: Text("${item}"), trailing: Icon(Icons.menu),)).toList(),
      onReorder: (int start, int current) {
        // dragging from top to bottom
        if (start < current) {
          int end = current - 1;
          String startItem = _list[start];
          int i = 0;
          int local = start;
          do {
            _list[local] = _list[++local];
            i++;
          } while (i < end - start);
          _list[end] = startItem;
        }
        // dragging from bottom to top
        else if (start > current) {
          String startItem = _list[start];
          for (int i = start; i > current; i--) {
            _list[i] = _list[i - 1];
          }
          _list[current] = startItem;
        }
        setState(() {});
      },
    ),
  );
}

Widget gridviewContent() {
  return ReorderableListView(
    scrollDirection: Axis.vertical,
    shrinkWrap: true,

    scrollController: ScrollController(),

    onReorder: (int start, int current) {
      if (start < current) {
        int end = current - 1;
        TumBankaModel startItem = gelenModel[start];
        int i = 0;
        int local = start;
        do {
          gelenModel[local] = gelenModel[++local];
          i++;
        } while (i < end - start);
        gelenModel[end] = startItem;
      }
      // dragging from bottom to top
      else if (start > current) {
        TumBankaModel startItem = gelenModel[start];
        for (int i = start; i > current; i--) {
          gelenModel[i] = gelenModel[i - 1];
        }
        gelenModel[current] = startItem;
      }
      setState(() {});
    },
    children: bodyContent(),
  );
}

List<Widget> bodyContent() {
  List<Widget> list = [];

  gelenModel.forEach((element) {
    list.add(bodyAltContent(element));
  });

  return list;
}
Padding bodyAltContent(TumBankaModel model) {
  return Padding(
    padding: EdgeInsets.only(top: 5),
    key: ValueKey(model),
    child: Material(
      //elevation: 10,
      elevation: 3,
      shape: RoundedRectangleBorder(
          borderRadius: BorderRadius.all(
            Radius.circular(15.0),
          )),
      child: InkWell(
        onTap: () {},
        child: Padding(
          padding: EdgeInsets.all(2),
          child: Container(
            child: getColumnItem(model),
          ),
        ),
      ),
    ),
  );
}