Stylus.PreviewStylusDown Stylus.PreviewStylusDown Stylus.PreviewStylusDown Attached Event

定義

使用者以手寫筆尖端碰觸平板電腦時發生。Occurs when user touches the tip of the stylus to the tablet.

see AddPreviewStylusDownHandler, and RemovePreviewStylusDownHandler
see AddPreviewStylusDownHandler, and RemovePreviewStylusDownHandler
see AddPreviewStylusDownHandler, and RemovePreviewStylusDownHandler

範例

下列範例示範如何確保當使用者將手寫筆觸及平板電腦時, 不會捕捉手寫筆。The following example demonstrates how to ensure that the stylus is not captured when the user touches the stylus to the tablet. 這個範例假設PreviewStylusDown事件已連接到事件處理常式。This example assumes that the PreviewStylusDown event is connected to the event handler.

void Window1_PreviewStylusDown(object sender, StylusEventArgs e)
{
    IInputElement capturedElement = Stylus.Captured;

    if (capturedElement != null)
    {
        capturedElement.ReleaseStylusCapture();
    }
}
Private Sub Window1_PreviewStylusDown(ByVal sender As Object, ByVal e As StylusDownEventArgs) _
    Handles Me.PreviewStylusDown

    Dim capturedElement As IInputElement = Stylus.Captured

    If Not (capturedElement Is Nothing) Then
        capturedElement.ReleaseStylusCapture()
    End If

End Sub

備註

這是附加事件。This is an attached event. WPFWPF將附加事件實作為路由事件。implements attached events as routed events. 附加事件基本上是一種XAMLXAML語言概念, 用來參考在不會定義事件的物件上處理的事件。An attached event is, fundamentally, a XAMLXAML language concept used to reference events that are handled on objects that do not, themselves, define events. WPFWPF進一步擴充附加事件的功能, 讓它能夠跨越路由。further expands an attached event's capabilities, allowing it to traverse a route. 附加事件在程式碼中沒有直接處理語法;若要在程式碼中附加路由事件的處理常式, 請使用指定的 Add * 處理常式方法。Attached events do not have a direct handling syntax in code; to attach handlers for a routed event in code, use a designated Add*Handler method. 如需詳細資訊, 請參閱附加事件總覽For details, see Attached Events Overview.

路由事件資訊Routed Event Information

識別碼欄位Identifier field PreviewStylusDownEvent
路由策略Routing strategy 建立Tunneling
Delegate - 委派Delegate StylusDownEventHandler

適用於

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