Provides rendering support in WPF, which includes hit testing, coordinate transformation, and bounding box calculations.
public abstract class Visual : System.Windows.DependencyObject
The Visual class is the basic abstraction from which every FrameworkElement object derives. It also serves as the entry point for writing new controls in WPF, and in many ways can be thought of as an equivalent of a window handle (HWND) in the Win32 application model.
The Visual object is a core WPF object, whose primary role is to provide rendering support. User interface controls, such as Button and TextBox, derive from the Visual class, and use the Visual defined properties for persisting their rendering data. The Visual object provides support for the following:
Output display: Rendering the persisted, serialized drawing content of a visual.
Transformations: Performing transformations on a visual.
Clipping: Providing clipping region support for a visual.
Hit testing: Determining whether a specified coordinate (point) or geometry is contained within the bounds of a visual.
Bounding box calculations: Determining the bounding rectangle of a visual.
Architecturally, the Visual object does not include support for other application development requirements / WPF features that are not immediately related to its rendering, such as the following:
Visual is provided as a public abstract class from which further classes can be derived. The following illustration shows the hierarchy of the existing visual objects that are defined in the WPF architecture.
Visual class hierarchy
For more information, see WPF Graphics Rendering Overview.
A Visual has a limited number of levels. In previous versions of the .NET Framework, this maximum depth was 255. This limit is inadequate for some layouts that have many levels in the visual tree.
In .NET Framework 4, the maximum depth of a Visual is 2047, which enables much deeper visual trees. In most applications, there is not enough stack space to traverse so many levels, and the result is a StackOverflowException during layout. For the default stack size, this exception is usually thrown when the tree depth is approximately 800, which corresponds to about 190 nested TreeViewItem objects.
If this exception is thrown by your application and you need to have a deeper visual tree, you can increase the application's stack size. You can increase the size of the stack by using the /STACK option at compile time or by using the EDITBIN utility. Increasing the stack size may affect your application's performance. For more information, see Stack Allocations and EDITBIN Options.
Provides the base initialization for objects derived from the Visual class.
Gets or sets a cached representation of the Visual.
Gets the number of child elements for the Visual.
Gets or sets the bitmap effect to apply to the Visual.
Gets or sets the offset value of the visual object.
Gets or sets the opacity of the Visual.
Gets the visual tree parent of the visual object.
Gets or sets a clipped scrollable area for the Visual.
Gets or sets the x-coordinate (vertical) guideline collection.
Gets or sets the y-coordinate (horizontal) guideline collection.
Defines the parent-child relationship between two visuals.
Returns the common ancestor of two visual objects.
Determines whether a geometry value is within the bounds of the visual object.
Determines whether a point coordinate value is within the bounds of the visual object.
Determines whether the visual object is an ancestor of the descendant visual object.
Determines whether the visual object is a descendant of the ancestor visual object.
Called when the DPI at which this View is rendered changes.
Called when the VisualCollection of the visual object is modified.
Called when the parent of the visual object is changed.
Removes the parent-child relationship between two visuals.
Returns a transform that can be used to transform coordinates from the Visual to the specified visual object descendant.
Returns a transform that can be used to transform coordinates from the Visual to the specified visual object.