FrameworkElement.MoveFocus(TraversalRequest) 方法

public:
 override bool MoveFocus(System::Windows::Input::TraversalRequest ^ request);

public override sealed bool MoveFocus(System.Windows.Input.TraversalRequest request);

override this.MoveFocus : System.Windows.Input.TraversalRequest -> bool

Public Overrides NotOverridable Function MoveFocus (request As TraversalRequest) As Boolean

参数

返回

如果焦点成功移动，true则返回false;如果按指定方向移动的目标元素不存在或无法以键盘为焦点。

示例

以下示例实现处理多个可能的按钮输入的处理程序。 每个按钮表示可能的 FocusNavigationDirection。 处理程序通过指定MoveFocus相应的初始化类型FocusNavigationDirection参数来跟踪具有当前键盘焦点的元素，并调用TraversalRequest该元素。

// Creating a FocusNavigationDirection object and setting it to a
// local field that contains the direction selected.
FocusNavigationDirection focusDirection = _focusMoveValue;

// MoveFocus takes a TraveralReqest as its argument.
TraversalRequest request = new TraversalRequest(focusDirection);

// Gets the element with keyboard focus.
UIElement elementWithFocus = Keyboard.FocusedElement as UIElement;

// Change keyboard focus.
if (elementWithFocus != null)
{
    elementWithFocus.MoveFocus(request);
}

' Creating a FocusNavigationDirection object and setting it to a
' local field that contains the direction selected.
Dim focusDirection As FocusNavigationDirection = _focusMoveValue

' MoveFocus takes a TraveralReqest as its argument.
Dim request As New TraversalRequest(focusDirection)

' Gets the element with keyboard focus.
Dim elementWithFocus As UIElement = TryCast(Keyboard.FocusedElement, UIElement)

' Change keyboard focus.
If elementWithFocus IsNot Nothing Then
    elementWithFocus.MoveFocus(request)
End If

注解

此实现替代 UIElement.MoveFocus 并密封方法。

另请参阅

• MoveFocus(TraversalRequest)
• Focus()