Makale
11/18/2011

FocusManager Class

Microsoft Silverlight will reach end of support after October 2021. Learn more.

Provides utility methods related to element focus, without the need to handle focus-related events.

Inheritance Hierarchy

System.Object
System.Windows.Input.FocusManager

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

Syntax

'Declaration
Public NotInheritable Class FocusManager

public static class FocusManager

Methods

	Name	Description
	GetFocusedElement()	Queries the Silverlight focus system to determine which object has focus.
	GetFocusedElement(DependencyObject)	Gets the element with focus within the specified focus scope.

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Remarks

Silverlight focus has the characteristic that while the focus-reporting events GotFocus and LostFocus are raised asynchronously, the focus returned by GetFocusedElement is determined synchronously. This design attempts to loosen constraints on runtime adjustments to element trees that could result from having to wait for the focus to be determined and moved. For cases where determining the synchronous focus is critical, use the GotFocus and LostFocus events as a cue, but then call FocusManager.GetFocusedElement to verify the synchronous focus.

Version Information

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

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