相关疑难解决方法(0)

我几乎把这件事与一件令人烦恼的事情分开了......

因为ListBox选择在鼠标按下时发生,如果在选择要拖动的最后一个项目时用鼠标向下开始拖动它可以正常工作,但是如果选择要先拖动的所有项目然后单击选择以开始拖动它,您单击的那个未被选中并在拖动后留下.

有关解决这个问题的最佳方法吗？

<DockPanel LastChildFill="True">
    <ListBox ItemsSource="{Binding SourceItems}"
             SelectionMode="Multiple"
             PreviewMouseLeftButtonDown="HandleLeftButtonDown"
             PreviewMouseLeftButtonUp="HandleLeftButtonUp"
             PreviewMouseMove="HandleMouseMove"
             MultiSelectListboxDragDrop:ListBoxExtension.SelectedItemsSource="{Binding SelectedItems}"/>
    <ListBox ItemsSource="{Binding DestinationItems}"
             AllowDrop="True"
             Drop="DropOnToDestination"/>
<DockPanel>

...

public partial class Window1
{
    private bool clickedOnSourceItem;

    public Window1()
    {
        InitializeComponent();
        DataContext = new WindowViewModel();
    }

    private void DropOnToDestination(object sender, DragEventArgs e)
    {
        var viewModel = (WindowViewModel)
                            e.Data.GetData(typeof(WindowViewModel));
        viewModel.CopySelectedItems();
    }

    private void HandleLeftButtonDown(object sender, MouseButtonEventArgs e)
    {
        var sourceElement = (FrameworkElement)sender;
        var hitItem = sourceElement.InputHitTest(e.GetPosition(sourceElement))
                      as FrameworkElement;

        if(hitItem != null)
        {
            clickedOnSourceItem = true;
        }
    }

    private void …