如何在 Flutter ReorderableListView 中的 ListTiles 之间创建 space

Question

我有一个看起来像这样的 ReorderableListView :

而且我希望它在他的 ListTile 之间有 space，就像在下面的 ListView.separated 中一样：

问题是我不想使用 ListView.separated 因为你不能用它拖放 ListTiles。

找到更新解决方案：

我在下面使用 Varun 的回答将我的 ListTile 包装在一个列中，但我没有使用 SizedBox，而是使用了一个 Container 来将 space 的颜色从白色更改为我的背景颜色：

Container(
          height: 5.0,
          color: MyColors.myBackgroundColor
        )

Answer 1

您可以将 listTile 的底部用填充物包裹起来作为“分隔线”，这可能并不理想，因为填充物将成为小部件的一部分，在拖动时会显示出来。

import 'package:flutter/material.dart';

void main() => runApp(const MyApp());

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  static const String _title = 'Flutter Code Sample';

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: _title,
      home: Scaffold(
        appBar: AppBar(title: const Text(_title)),
        body: const MyStatefulWidget(),
      ),
    );
  }
}

class MyStatefulWidget extends StatefulWidget {
  const MyStatefulWidget({Key? key}) : super(key: key);

  @override
  State<MyStatefulWidget> createState() => _MyStatefulWidgetState();
}

class _MyStatefulWidgetState extends State<MyStatefulWidget> {
  final List<int> _items = List<int>.generate(50, (int index) => index);

  @override
  Widget build(BuildContext context) {
    final ColorScheme colorScheme = Theme.of(context).colorScheme;
    final Color oddItemColor = colorScheme.primary.withOpacity(0.05);
    final Color evenItemColor = colorScheme.primary.withOpacity(0.15);

    return ReorderableListView(
      padding: const EdgeInsets.symmetric(horizontal: 40),
      children: <Widget>[
        for (int index = 0; index < _items.length; index++)
          Padding(
              key: Key('$index'),
              padding: const EdgeInsets.only(bottom: 4),
              child: ListTile(
                tileColor: _items[index].isOdd ? oddItemColor : evenItemColor,
                title: Text('Item ${_items[index]}'),
              )),
      ],
      onReorder: (int oldIndex, int newIndex) {
        setState(() {
          if (oldIndex < newIndex) {
            newIndex -= 1;
          }
          final int item = _items.removeAt(oldIndex);
          _items.insert(newIndex, item);
        });
      },
    );
  }
}

将 space 添加为不可重新排序的小部件对于 ReorderableListView 似乎是不可能的，即使添加虚拟项目使 ListTiles 与 AbsorbPointer 交错仍然使它们可重新排序。所以上面的方法至少是可行的

      children: <Widget>[
        for (int index = 0; index < _items.length; index++)
          if (index.isOdd)
            ListTile(
              key: Key('$index'),
              tileColor: _items[index].isOdd ? oddItemColor : evenItemColor,
              title: Text('Item ${_items[index]}'),
            )
          else if (index.isEven)
            AbsorbPointer(
              key: Key('$index'),
              child: SizedBox.square(
                key: Key('$index'),
                dimension: 40,
              ),
            ),
      ],

Answer 2

将您的 ListTile 包裹在一列中，并使用 SizedBox 分隔列表项。在列中使用键，而不是在 ListTile 中。

import 'package:flutter/material.dart';

void main() => runApp(const MyApp());

class MyApp extends StatelessWidget {
  const MyApp({Key? key}) : super(key: key);

  static const String _title = 'Flutter Code Sample';

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: _title,
      home: Scaffold(
        appBar: AppBar(title: const Text(_title)),
        body: const MyStatefulWidget(),
      ),
    );
  }
}

class MyStatefulWidget extends StatefulWidget {
  const MyStatefulWidget({Key? key}) : super(key: key);

  @override
  State<MyStatefulWidget> createState() => _MyStatefulWidgetState();
}

class _MyStatefulWidgetState extends State<MyStatefulWidget> {
  final List<int> _items = List<int>.generate(50, (int index) => index);

  @override
  Widget build(BuildContext context) {
    final ColorScheme colorScheme = Theme.of(context).colorScheme;
    final Color oddItemColor = colorScheme.primary.withOpacity(0.05);
    final Color evenItemColor = colorScheme.primary.withOpacity(0.15);

    return ReorderableListView(
      padding: const EdgeInsets.symmetric(horizontal: 40),
      children: <Widget>[
        for (int index = 0; index < _items.length; index++)
          Column(
            key: Key('$index'),
            children: [
              ListTile(
                tileColor: _items[index].isOdd ? oddItemColor : evenItemColor,
                title: Text('Item ${_items[index]}'),
              ),
              SizedBox(
                height: 5,
              ),
            ],
          ),
      ],
      onReorder: (int oldIndex, int newIndex) {
        setState(() {
          if (oldIndex < newIndex) {
            newIndex -= 1;
          }
          final int item = _items.removeAt(oldIndex);
          _items.insert(newIndex, item);
        });
      },
    );
  }
}

如何在 Flutter ReorderableListView 中的 ListTiles 之间创建 space

How to create space between ListTiles in Flutter ReorderableListView

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