在同一ListView中拖放项目 [英] Drag and drop item in same ListView

问题描述

我有以下 ListView

<ListView Name="listAccounts" Width="300" AllowDrop="True" SelectionMode="Single" CanDragItems="True" CanDrag="True" CanReorderItems="True" Background="{ThemeResource myBackground}" DragItemsStarting="listAccounts_DragItemsStarting" Drop="listAccounts_Drop">

并将我的事件处理程序定义为

and defined my event handlers as

private void listAccounts_DragItemsStarting(object sender, DragItemsStartingEventArgs e)
{
    e.Data.SetData("itemIndex", (e.Items[0] as AccountList).Text.ToString());
}

private async void listAccounts_Drop(object sender, DragEventArgs e)
{
    string itemIndexString = await e.Data.GetView().GetTextAsync("itemIndex");
}

我不知道还能做些什么。我想在同一个列表中实现列表项的移动。

I don't know what else I can do. I want to realize the movement of the list items in the same list.

推荐答案

我转到官方的Windows 10样本，查找拖放示例并将其修剪掉（例如从目标到源代码的删除）。原来你甚至不需要处理任何事件，以便在单个 ListView 工作中重新排序。

I went over to the official Windows 10 samples, looked for the drag-drop sample and trimmed it down (like removing the drag from target to source). Turns out you don't even have to handle any events to make re-ordering in a single ListView work.

<ListView x:Name="TargetListView"
                Grid.Row="2" Grid.Column="1" Margin="8,4"
                CanReorderItems="True" CanDrag="True" AllowDrop="True"
                />

在重新排序项目后，检查您的 ObservableCollection 我们会注意到这是正确的。如果要跟踪重新排序，您必须在 ObservableCollection 上查看 CollectionChanged 事件 ListView 没有事件执行此操作。

Check your ObservableCollection after reordering items and you'll notice it's correct. If you want to track the re-ordering, you'll have to check the CollectionChanged event on your ObservableCollection, as there is no event on the ListView to do this.

如果您要支持拖放放弃多个列表浏览，我想再看一下样本。

If you want to support drag & drop accross multilple listviews, I'd say have another look at the sample.

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