The DrawingVisual can be used to create a custom visual object. For this reason, drawings are ideal for backgrounds and clip art. This class is considered lightweight because it does not provide layout or event handling, which improves its runtime performance. The DrawingVisual is a lightweight drawing class that is used to render shapes, images, or text. The following illustration shows the hierarchy of the visual objects that are exposed in WPF. Visual is exposed as a public abstract class from which child classes must be derived. However, the Visual object does not include support for non-rendering features, such as: Hit testing: Determining whether a coordinate or geometry is contained within the bounds of a visual.īounding box calculations: Determining the bounding rectangle of a visual. Transformations: Performing transformations on a visual.Ĭlipping: Providing clipping region support for a visual. Output display: Rendering the persisted, serialized drawing content of a visual. User interface controls, such as Button and TextBox, derive from the Visual class, and use it for persisting their rendering data. The Visual object is a core WPF object, whose primary role is to provide rendering support. It also serves as the entry point for writing new controls in WPF, and in many ways can be thought of as the window handle (HWND) in the Win32 application model. The Visual class is the basic abstraction from which every FrameworkElement object derives. It focuses on the role of the Visual class for rendering support in the WPF model. This topic provides an overview of the WPF visual layer.
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