internal static GeneralTransform TransformToScreenRoot(UIElement target)
{
GeneralTransform generalTransform = null;
try
{
generalTransform = target.TransformToVisual(null);
}
catch (ArgumentException)
{
return new MatrixTransform { Matrix = Matrix.Identity };
}
var transform = generalTransform as Transform;
if (transform == null)
{
var p = generalTransform.Transform(new Point(0, 0));
return new TranslateTransform { X = p.X * ZoomFactor, Y = p.Y * ZoomFactor };
}
else
{
var group = new TransformGroup();
group.Children.Add(transform);
// The zoom factor is calculated automatically when the control is in a popup.
if (target.ParentOfType<System.Windows.Controls.Primitives.Popup>() == null)
{
group.Children.Add(new ScaleTransform { ScaleX = 1d / ZoomFactor, ScaleY = 1d / ZoomFactor });
}
else
{
}
return group;
}
}