UI Automation Support for the HeaderItem Control Type

Note

This documentation is intended for .NET Framework developers who want to use the managed UI Automation classes defined in the System.Windows.Automation namespace. For the latest information about UI Automation, see Windows Automation API: UI Automation.

This topic provides information about UI Automation support for the HeaderItem control type. In UI Automation, a control type is a set of conditions that a control must meet in order to use the ControlTypeProperty property. The conditions include specific guidelines for UI Automation tree structure, UI Automation property values and control patterns.

The HeaderItem control type provides a visual label for a row or column of information.

Header item controls are examples of controls that implement the HeaderItem control type. The UI Automation requirements in the following sections apply to all header controls, whether Windows Presentation Foundation (WPF), Win32, or Windows Forms.

Required UI Automation Tree Structure

The following table depicts the control view and the content view of the UI Automation tree that pertains to header item controls and describes what can be contained in each view. For more information on the UI Automation tree, see UI Automation Tree Overview.

Control View Content View
HeaderItem None

Required UI Automation Properties

The following table lists the UI Automation properties whose value or definition is especially relevant to header item controls. For more information about UI Automation properties, see UI Automation Properties for Clients.

UI Automation Property Value Notes
AutomationIdProperty See notes. The value of this property needs to be unique across all controls in an application.
BoundingRectangleProperty See notes. The outermost rectangle that contains the whole control.
ClickablePointProperty See notes. Supported if there is a bounding rectangle. If not every point within the bounding rectangle is clickable, and you perform specialized hit testing, then override and provide a clickable point.
IsKeyboardFocusableProperty See notes. If the control can receive keyboard focus, it must support this property.
NameProperty See notes. The header item control is always self-labeling.
LabeledByProperty Null. Header item controls do not have a static label.
ControlTypeProperty HeaderItem This value is the same for all UI frameworks.
LocalizedControlTypeProperty "header item" Localized string for the HeaderItem control type.
IsContentElementProperty False The header item control is not included in the content view of the UI Automation tree.
IsControlElementProperty True The header item control is always included in the control view of the UI Automation tree.
ItemStatusProperty See notes. This property provides information for sort orders by the header item.

Required UI Automation Control Patterns

The following table lists the UI Automation control patterns required to be supported by all header item controls. For more information on control patterns, see UI Automation Control Patterns Overview.

Control Pattern Support Notes
ITransformProvider Depends Implement this control pattern if the header item control can be resized.
IInvokeProvider Depends Implement this control pattern if the header item control can be clicked to sort the data.

Required UI Automation Events

The following table lists the UI Automation events required to be supported by all header item controls. For more information on events, see UI Automation Events Overview.

UI Automation Event Support Notes
InvokedEvent Depends None
BoundingRectangleProperty property-changed event. Required None
IsOffscreenProperty property-changed event. Required None
IsEnabledProperty property-changed event. Required None
AutomationFocusChangedEvent Required None
StructureChangedEvent Required None

See Also

HeaderItem
UI Automation Control Types Overview
UI Automation Overview