private void AdornedElement_MouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
dragging = true;
if (!(AdornedElement.RenderTransform is TranslateTransform transform))
{
transform = new TranslateTransform();
AdornedElement.RenderTransform = transform;
}
dragStartElementPosition = new Point(transform.X, transform.Y);
dragStartMousePosition = e.GetPosition(null);
AdornedElement.CaptureMouse();
e.Handled = true;
OnDragStart?.Invoke(this, EventArgs.Empty);
}