KeyboardFocusChangedEventArgs Class
Assembly: PresentationCore (in presentationcore.dll)
XML Namespace: http://schemas.microsoft.com/winfx/2006/xaml/presentation
KeyboardFocusChangedEventArgs is used with the following events: LostKeyboardFocus, GotKeyboardFocus, and the corresponding tunneling events.
If the PreviewGotKeyboardFocus event or the PreviewLostKeyboardFocus event is handled, keyboard focus will not change.
This example shows how to change the color of an element when it gains and loses focus by using the GotFocus and LostFocus events.
This example consists of a Extensible Application Markup Language (XAML) file and a code-behind file. For the complete samples, see Firing Events when an Element Gains and Loses Focus Sample.
The following XAML creates the user interface, which consists of two Button objects, and attaches event handlers for the GotFocus and LostFocus events to the Button objects.
<StackPanel> <StackPanel.Resources> <Style TargetType="{x:Type Button}"> <Setter Property="Height" Value="20"/> <Setter Property="Width" Value="250"/> <Setter Property="HorizontalAlignment" Value="Left"/> </Style> </StackPanel.Resources> <Button GotFocus="OnGotFocusHandler" LostFocus="OnLostFocusHandler">Click Or Tab To Give Keyboard Focus</Button> <Button GotFocus="OnGotFocusHandler" LostFocus="OnLostFocusHandler">Click Or Tab To Give Keyborad Focus</Button> </StackPanel>
The following code behind creates the GotFocus and LostFocus event handlers. When the Button gains keyboard focus, the Background of the Button is changed to red. When the Button loses keyboard focus, the Background of the Button is changed back to white.
public partial class Window1 : Window { public Window1() { InitializeComponent(); } // Raised when Button gains focus. // Changes the color of the Button to Red. private void OnGotFocusHandler(object sender, RoutedEventArgs e) { Button tb = e.Source as Button; tb.Background = Brushes.Red; } // Raised when Button losses focus. // Changes the color of the Button back to white. private void OnLostFocusHandler(object sender, RoutedEventArgs e) { Button tb = e.Source as Button; tb.Background = Brushes.White; } }
System.EventArgs
System.Windows.RoutedEventArgs
System.Windows.Input.InputEventArgs
System.Windows.Input.KeyboardEventArgs
System.Windows.Input.KeyboardFocusChangedEventArgs
Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.