flutter - 如何在 flutter 中将页脚添加到 ReorderableListView

Question

尝试使用 制作包含页眉和页脚的 ui可重新排列的内容 项目。有一个属性叫 标题我们可以从中添加标题项。但是如果我想添加怎么办页脚项目也是如此。

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

列表的最后一个元素可以是页脚。它必须是具有 onLongPress 属性的小部件。例如:

ReorderableListView(
      onReorder: (int oldIndex, int newIndex) {},
      children: List.generate(someList.items.length + 1, (index) {
        if (index < someList.items.length)
          return ListTile(
            key: Key(someList.items[index].description),
          );
        else
          return RaisedButton(key: Key('footer'), onPressed: () {}, onLongPress: (){}, child: Text('Button'));
      })),