Abstract class that represents a FrameworkElement that decorates a UIElement.
An Adorner is a custom FrameworkElement that is bound to a UIElement. Adorners are rendered in an AdornerLayer, which is a rendering surface that is always on top of the adorned element or a collection of adorned elements. Rendering of an adorner is independent from rendering of the UIElement that the adorner is bound to. An adorner is typically positioned relative to the element to which it is bound, using the standard 2-D coordinate origin located at the upper-left of the adorned element.
Common applications for adorners include:
Adding functional handles to a UIElement that enable a user to manipulate the element in some way (resize, rotate, reposition, etc.).
Provide visual feedback to indicate various states, or in response to various events.
Overlay visual decorations on a UIElement.
Visually mask or override part or all of a UIElement.
Windows Presentation Foundation (WPF) provides a basic framework for adorning visual elements. The following table lists the primary types used when adorning objects, and their purpose
