Determine the bounding rect of a WPF element relative to some parent

c# wpf layout bounds rect
devios1 picture devios1 · Aug 13, 2010 · Viewed 14.7k times · Source

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?

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.

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!

Answer

Ray Burns picture Ray Burns · Aug 13, 2010

It is quite simple:

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

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

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