Getting the top left coordinates of a WPF UIElement

Question

I am working on extending the Microsoft resize Adorner example and need to be able to reposition the element after say the bottom left drag handle has been drag

Answer 1

You can transform coordinates of the UIElement to its parent. In your case it's a form. Here is an example of a method that returns coordinates of a visual:

private Point GetPosition(Visual element) {
   var positionTransform = element.TransformToAncestor(MyForm);
   var areaPosition = positionTransform.Transform(new Point(0, 0));

   return areaPosition;
}

Answer 2

And if someone just wants the control's screen coordinates:

Point targetLoc = targetCtrl.PointToScreen(new Point(0, 0));

(this doesn't match the thread's description, but it does match the title. Figured it might help people coming in off search results)