确定WPF元素相对于某些父对象的边界rect [英] Determine the bounding rect of a WPF element relative to some parent

问题描述

我认为这是一个非常简单的请求，但是我似乎无法在搜索中找到一个确定的答案.如何确定窗口中特定视觉元素相对于其他父元素的界限?

I consider this a pretty simple request, but I can't seem to find a conclusive answer in my searches. How can I determine the bounds of a particular visual element in my window, relative to some other parent element?

我尝试使用LayoutInformation.GetLayoutSlot，但这似乎只是在0,0返回Rect，并且不能反映元素的实际位置.

I've tried using LayoutInformation.GetLayoutSlot but this just seems to return a Rect at 0,0 and doesn't reflect the actual location of the element.

我想做的是使用RenderTargetBitmap对窗口进行截屏"，然后将其裁剪为特定的元素，但是我无法获得元素的边界来知道将位图裁剪到什么！

What I'm trying to do is take a "screenshot" of a window using RenderTargetBitmap and then crop it to a particular element, but I can't get the element's bounds to know what to crop the bitmap to!

推荐答案

这很简单:

public static Rect BoundsRelativeTo(this FrameworkElement element,
                                         Visual relativeTo)
{
  return
    element.TransformToVisual(relativeTo)
           .TransformBounds(LayoutInformation.GetLayoutSlot(element));
}

实际上，将其放在单独的方法中可能会过大.

In fact it may be overkill to put it in a separate method.

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