我可以在WPF画布中使用ZIndex较低的HitTest元素吗？ [英] Can I HitTest element with lower ZIndex in WPF Canvas?

问题描述

当我在鼠标单击画布上使用 System.Windows.Media.VisualTreeHelper.HitTest 时，它总是使我返回顶部的元素。我的意思是，如果有两个元素相互重叠，我得到的就是画布中ZIndex较高的元素。

When I am using System.Windows.Media.VisualTreeHelper.HitTest on mouse clicking canvas, it always returns me the element on top. I mean if there are two elements overlapping each other, the one I get is the one with higher ZIndex in canvas.

我也尝试做到了这种方式，但即使在我 IsHitTestVisible = False 它仍然向我返回了相同的那个。

I also tried to do it this way, but even after I made IsHitTestVisible = False it still returned this same one to me.

是否有可能将元素置于下方 ？

Is there any possibility to get the element "underneath"?

推荐答案

请参见此处的命中测试和Z顺序部分：在可视层中进行命中测试，并在此处提供代码示例： VisualTreeHelper.HitTest方法。

See the section "Hit Testing and Z-Order" here: Hit Testing in the Visual Layer, and a code example here: VisualTreeHelper.HitTest Method.

简而言之，您需要使用 HitTest（）方法之一，并采用 HitTestResultCallback ，然后从您的回调中重新转动 HitTestResultBehavior。继续直到找到所需的元素：

In short, you need to use one of the HitTest() methods that take a HitTestResultCallback, and then from your callback return HitTestResultBehavior.Continue until you reach the element you're looking for:

Point pt = ...
VisualTreeHelper.HitTest(myCanvas, null,
                         new HitTestResultCallback(MyHitTestResult),
                         new PointHitTestParameters(pt));
...

private HitTestResultBehavior MyHitTestResult(HitTestResult result)
{
    DoSomethingWith(result.VisualHit);

    //Set the behavior to return visuals at all z-order levels. 
    return HitTestResultBehavior.Continue;
}

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