FrameworkElement.MoveFocus(TraversalRequest) 方法

定义

命名空间:

System.Windows

程序集:

PresentationFramework.dll

以提供的遍历方向将键盘焦点从此元素移到其他元素上。

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

request

TraversalRequest

焦点要移动的方向，作为一个枚举值。

返回

Boolean

如果焦点移动成功，则返回 true；如果指定方向上不存在目标元素，或者未能将键盘焦点移到目标元素上，则返回 false。

示例

以下示例实现一个处理程序，用于处理多个可能的按钮输入。 每个按钮都表示一个可能的 FocusNavigationDirection。 处理程序跟踪具有当前键盘焦点的元素，并通过指定相应的 FocusNavigationDirection 作为所提供的类型参数的初始化来调用MoveFocus该TraversalRequest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

此实现重写 UIElement.MoveFocus 并密封 方法。

另请参阅

• MoveFocus(TraversalRequest)
• Focus()