AccessibleObject.Bounds Property


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Gets the location and size of the accessible object.

Namespace:   System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)

abstract Bounds : Rectangle with get
override Bounds : Rectangle with get

Property Value

Type: System.Drawing.Rectangle

A Rectangle that represents the bounds of the accessible object.

Exception Condition

The bounds of control cannot be retrieved.

The Bounds property retrieves the object's bounding rectangle in screen coordinates. If the object has a nonrectangular shape, then this property represents the smallest rectangle that completely encompasses the entire object region. Therefore, for nonrectangular objects such as list view items, the coordinates of the object's bounding rectangle can fail, if tested, by calling the HitTest method, because HitTest determines the object's boundaries on a pixel-by-pixel basis.

Notes to Inheritors:

The default implementation returns the accessible object's bounding rectangle if the object wraps a system control; otherwise, it returns Rectangle.Empty. All visible accessible objects must support this method. Sound objects do not support this method.

The following example demonstrates the creation of an accessibility-aware chart control, using the AccessibleObject and Control.ControlAccessibleObject classes to expose accessible information. The control plots two curves along with a legend. The ChartControlAccessibleObject class, which derives from ControlAccessibleObject, is used in the CreateAccessibilityInstance method to provide custom accessible information for the chart control. Since the chart legend is not an actual Control -based control, but instead is drawn by the chart control, it does not have any built-in accessible information. Because of this, the ChartControlAccessibleObject class overrides the GetChild method to return the CurveLegendAccessibleObject that represents accessible information for each part of the legend. When an accessible-aware application uses this control, the control can provide the necessary accessible information.

This code excerpt demonstrates overriding the Bounds property. See the AccessibleObject class overview for the complete code example.

No code example is currently available or this language may not be supported.

.NET Framework
Available since 1.1
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