private static DragAdorner <T> getDragDropAdorner(DependencyObject s, bool createIfNotExists = true)
{
Window parentWindow = Window.GetWindow(s);
if (parentWindow != null)
{
AdornerDecorator decorator = UITools.FindVisualChildByName <AdornerDecorator>
(parentWindow, "PART_DragDropAdorner");
if (decorator == null)
{
throw new ArgumentException("PART_DragDropAdorner not found, or not an AdornerDecorator");
}
else
{
AdornerLayer adornerLayer = AdornerLayer.GetAdornerLayer(decorator);
Adorner[] adorners = adornerLayer.GetAdorners(adornerLayer);
if (adorners != null)
{
foreach (var adorner in adorners)
{
if (adorner is DragAdorner <T> )
{
return(adorner as DragAdorner <T>);
}
}
}
if (createIfNotExists)
{
DragAdorner <T> newAdorner = new DragAdorner <T>(adornerLayer);
adornerLayer.Add(newAdorner);
return(newAdorner);
}
}
}
return(null);
}
public static void SetDragAdorner(DependencyObject obj, DragAdorner <T> value)
{
obj.SetValue(DragAdornerProperty, value);
}
