private static void SetBackgroundHost(UIElement obj, WindowBackgroundVisualHost value)
{
obj.SetValue(BackgroundHostPropertyKey, value);
}
static WindowBackgroundVisualHost GetHost(UIElement element)
{
var root = element.VisualAncestors().OfType<UIElement>().LastOrDefault();
if (root == null) return null;
var host = GetBackgroundHost(root);
if (host == null)
{
var decorator = root.VisualDescendants().OfType<AdornerDecorator>().FirstOrDefault();
if (decorator != null && decorator.Child != null)
{
host = new WindowBackgroundVisualHost(decorator.Child);
if (decorator is BusyAdornerDecorator)
((BusyAdornerDecorator)decorator).BusyIndicatorHost = host;
else
decorator.AdornerLayer.Add(host);
SetBackgroundHost(root, host);
}
}
return host;
}
