WPF列表框IndexFromPoint [英] WPF ListBox IndexFromPoint

问题描述

我执行WPF列表框和I之间的拖放希望能够插入在它被丢弃，而不是列表的末尾位置集合

I am performing a drag drop between WPF ListBoxes and I would like to be able to insert into the collection at the position it is dropped rather than the end of the list.

有谁知道一个解决方案，就是类似的WinForms ListBox中IndexFromPoint功能？

Does anyone know of a solution that is similar to the WinForms ListBox IndexFromPoint function?

推荐答案

我最终得到这个工作通过使用DragDropEvent.GetPosition，VisualTreeHelper.GetDescendantBounds和Rect.Contains的组合。以下是我想出了：

I ended up getting this work by using a combination of DragDropEvent.GetPosition, VisualTreeHelper.GetDescendantBounds and Rect.Contains. Here's what I came up with:

int index = -1;
for (int i = 0; i < collection.Count; i++)
{
   var lbi = listBox.ItemContainerGenerator.ContainerFromIndex(i) as ListBoxItem;
   if (lbi == null) continue;
   if (IsMouseOverTarget(lbi, e.GetPosition((IInputElement)lbi)))
   {
       index = i;
       break;
   }
}

中的代码驻留在列表框Drop事件。 。电子对象传递到Drop事件DragEventArgs对象

The code resides in the ListBox Drop event. The e object is the DragEventArgs object passed into the Drop event.

有关IsMouseOverTarget的实现是：

The implementation for IsMouseOverTarget is:

private static bool IsMouseOverTarget(Visual target, Point point)
{
    var bounds = VisualTreeHelper.GetDescendantBounds(target);
    return bounds.Contains(point);
}

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