如何在页眉中向ReorderableListView添加页脚

Question

试图制作包含可重排内容项的页眉和页脚的ui。有一个名为header的属性，我们可以从中添加标题项。但是，如果我也想添加footer项目怎么办。

import 'package:flutter/material.dart';

class MyStickyHeader extends StatefulWidget {
  @override
  State<StatefulWidget> createState() {
    return _MyStickyHeaderState();
  }
}

class _MyStickyHeaderState extends State<MyStickyHeader> {
  List<Widget> _list = [
    Text("Apple"),
    Text("Ball"),
    Text("Cat"),
    Text("Dog"),
    Text("Elephant")
  ];

  @override
  Widget build(BuildContext context) {
    return Container(
      margin: EdgeInsets.only(top: 30, left: 10),
      color: Colors.white,
      child: showData(),
    );
  }

  Widget showData() {
    return Container(
      child: ReorderableListView(
        header: Container(
          height: 100,
          color: Colors.red,
        ),
        children: _list
            .map((item) => Container(
                  padding: EdgeInsets.all(10),
                  key: Key("${(item as Text).data}"),
                  child: Row(
                    children: <Widget>[
                      Icon(Icons.ac_unit),
                      Expanded(
                        child: item,
                      )
                    ],
                  ),
                ))
            .toList(),
        onReorder: (int start, int current) {
          // dragging from top to bottom
          if (start < current) {
            int end = current - 1;
            Widget 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
          if (start > current) {
            Widget startItem = _list[start];
            for (int i = start; i > current; i--) {
              _list[i] = _list[i - 1];
            }
            _list[current] = startItem;
          }
          setState(() {});
        },
      ),
    );
  }
}

Answer 1

[如果用ReorderableListView和Column小部件包装Expanded，则可以在底部添加Container以用作页脚：

Column(
  children: <Widget>[
    Expanded(
      child: ReorderableListView(
        header: Container(
          height: 100,
          color: Colors.red,
        ),
        children: _list
          .map((item) => Container(
          padding: EdgeInsets.all(10),
          key: Key("${(item as Text).data}"),
          child: Row(
            children: <Widget>[
              Icon(Icons.ac_unit),
              Expanded(
                child: item,
              )
            ],
          ),
        )).toList(),
        onReorder: (int start, int current) {
          // dragging from top to bottom
          if (start < current) {
            int end = current - 1;
            Widget 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
          if (start > current) {
            Widget startItem = _list[start];
            for (int i = start; i > current; i--) {
              _list[i] = _list[i - 1];
            }
            _list[current] = startItem;
          }
          setState(() {});
        },
      ),
    ),
    Container(
      height: 40,
      alignment: Alignment.center,
      child: Text('Footer'),
      color: Colors.orange,
    ),
  ],
),