windows WinUI3 ListView获取放置项的位置

0x6upsns 于 2023-11-21 发布在 Windows

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有了ListView，我怎么才能得到列表中的索引，从同一个列表中的项目被删除？（重新排序）我尝试使用以下回调，但DragItemsCompletedEventArgs或OnDropIntoStagedPhotos似乎都没有合适的方法。

void TableContentPage::OnStagedDragItemsCompleted(
    [[maybe_unused]] ::winrt::Windows::Foundation::IInspectable const &,
    [[maybe_unused]] ::winrt::Microsoft::UI::Xaml::Controls::
        DragItemsCompletedEventArgs const &args)
{
}
void TableContentPage::OnDropIntoStagedPhotos(
    [[maybe_unused]] Windows::Foundation::IInspectable const  &sender,
    [[maybe_unused]] Microsoft::UI::Xaml::DragEventArgs const &args)
{
}

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我使用以下ListView属性：

<ListView x:Name="ListViewName"
          Grid.Row="0"
          Grid.Column="0"
          ScrollViewer.HorizontalScrollMode="Enabled"
          ScrollViewer.HorizontalScrollBarVisibility="Visible"
          ScrollViewer.IsHorizontalRailEnabled="True"
          CanDragItems="True"
          CanReorderItems="True"
          IsSwipeEnabled="True"
          HorizontalAlignment="Stretch"
          AllowDrop="True"
          Background="{StaticResource PrimaryColor}"
          Drop="OnDropIntoStagedPhotos"
          DragOver="OnDragOverStagedPhotos"
          DragItemsCompleted="OnStagedDragItemsCompleted"
          DragItemsStarting="OnStagedDragItemsStarting"
          SelectionMode="Extended"
          SelectionChanged="OnStagedPhotosSelectionChanged">

型

windows

来源：https://stackoverflow.com/questions/77357750/winui3-listview-getting-the-position-where-the-item-is-dropped

1条答案

按热度按时间

vngu2lb81#

ListViewBase.DragItemsCompleted给出了被拖动的项目，使用IVector.IndexOf，你可以检索索引。所以，我们只需要区分重新排序和移动。目的地有必要给出区别。
有一个UWP XamlDragAndDrop示例可以参考。

/// <summary>
/// Drop on the Trash
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
void Scenario1_ListView::TargetTextBlock_Drop(Platform::Object^ sender, Windows::UI::Xaml::DragEventArgs^ e)
{
    if (e->DataView->Contains(StandardDataFormats::Text))
    {
        // We need to take the deferral as the source will read _deletedItem which
        // we cannot set synchronously
        auto def = e->GetDeferral();
        create_task(e->DataView->GetTextAsync()).then([this, e, def](String^ s)
        {
            _deletedItem = s;
            e->AcceptedOperation = DataPackageOperation::Move;
            def->Complete();
        });
    }
}

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windows WinUI3 ListView获取放置项的位置

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