UIElement.ManipulationDelta UIElement.ManipulationDelta UIElement.ManipulationDelta UIElement.ManipulationDelta Event

定義

輸入裝置在操作期間變更位置時發生。Occurs when the input device changes position during a manipulation.

public:
 event EventHandler<System::Windows::Input::ManipulationDeltaEventArgs ^> ^ ManipulationDelta;
public event EventHandler<System.Windows.Input.ManipulationDeltaEventArgs> ManipulationDelta;
member this.ManipulationDelta : EventHandler<System.Windows.Input.ManipulationDeltaEventArgs> 
Public Custom Event ManipulationDelta As EventHandler(Of ManipulationDeltaEventArgs) 

範例

下列範例顯示的事件處理常式ManipulationDelta事件。The following example shows an event handler for the ManipulationDelta event. 此範例會使用DeltaManipulation屬性來移動、 調整大小和輪替RectangleThe example uses the DeltaManipulation property to move, resize, and rotate a Rectangle. 此範例也會檢查是否ManipulationDelta慣性和矩形會觸碰視窗邊緣期間發生的事件。The example also checks whether the ManipulationDelta event occurred during inertia and whether the rectangle is touching the edge of a window. 如果這些情況下,則為 true,應用程式會停止操作,若要防止將應用程式的可見區域的矩形。If those cases are true, the application stops the manipulation to prevent the rectangle from leaving the visible area of the application. 這個範例是在較大範例的一部分逐步解說:建立您的第一個觸控應用程式This example is part of a larger example in Walkthrough: Creating Your First Touch Application.

void Window_ManipulationDelta(object sender, ManipulationDeltaEventArgs e)
{
    
    // Get the Rectangle and its RenderTransform matrix.
    Rectangle rectToMove = e.OriginalSource as Rectangle;
    Matrix rectsMatrix = ((MatrixTransform)rectToMove.RenderTransform).Matrix;

    // Rotate the Rectangle.
    rectsMatrix.RotateAt(e.DeltaManipulation.Rotation, 
                         e.ManipulationOrigin.X, 
                         e.ManipulationOrigin.Y);

    // Resize the Rectangle.  Keep it square 
    // so use only the X value of Scale.
    rectsMatrix.ScaleAt(e.DeltaManipulation.Scale.X, 
                        e.DeltaManipulation.Scale.X, 
                        e.ManipulationOrigin.X,
                        e.ManipulationOrigin.Y);

    // Move the Rectangle.
    rectsMatrix.Translate(e.DeltaManipulation.Translation.X,
                          e.DeltaManipulation.Translation.Y);

    // Apply the changes to the Rectangle.
    rectToMove.RenderTransform = new MatrixTransform(rectsMatrix);

    Rect containingRect =
        new Rect(((FrameworkElement)e.ManipulationContainer).RenderSize);

    Rect shapeBounds =
        rectToMove.RenderTransform.TransformBounds(
            new Rect(rectToMove.RenderSize));

    // Check if the rectangle is completely in the window.
    // If it is not and intertia is occuring, stop the manipulation.
    if (e.IsInertial && !containingRect.Contains(shapeBounds))
    {
        e.Complete();
    }

    
    e.Handled = true;
}
Private Sub Window_ManipulationDelta(ByVal sender As Object, ByVal e As ManipulationDeltaEventArgs)

    ' Get the Rectangle and its RenderTransform matrix.
    Dim rectToMove As Rectangle = e.OriginalSource
    Dim rectTransform As MatrixTransform = rectToMove.RenderTransform
    Dim rectsMatrix As Matrix = rectTransform.Matrix


    ' Rotate the shape
    rectsMatrix.RotateAt(e.DeltaManipulation.Rotation,
                         e.ManipulationOrigin.X,
                         e.ManipulationOrigin.Y)

    ' Resize the Rectangle. Keep it square 
    ' so use only the X value of Scale.
    rectsMatrix.ScaleAt(e.DeltaManipulation.Scale.X,
                        e.DeltaManipulation.Scale.X,
                        e.ManipulationOrigin.X,
                        e.ManipulationOrigin.Y)

    'move the center
    rectsMatrix.Translate(e.DeltaManipulation.Translation.X,
                          e.DeltaManipulation.Translation.Y)

    ' Apply the changes to the Rectangle.
    rectTransform = New MatrixTransform(rectsMatrix)
    rectToMove.RenderTransform = rectTransform

    Dim container As FrameworkElement = e.ManipulationContainer
    Dim containingRect As New Rect(container.RenderSize)

    Dim shapeBounds As Rect = rectTransform.TransformBounds(
                                New Rect(rectToMove.RenderSize))

    ' Check if the rectangle is completely in the window.
    ' If it is not and intertia is occuring, stop the manipulation.
    If e.IsInertial AndAlso Not containingRect.Contains(shapeBounds) Then
        e.Complete()
    End If

    e.Handled = True
End Sub

備註

ManipulationDelta事件會發生多次,當使用者拖曳手指螢幕於操作期間,另一次慣性發生時。The ManipulationDelta event occurs multiple times when the user drags fingers over the screen during a manipulation and again when inertia occurs. 您可以使用IsInertial來檢查是否在慣性期間發生事件的屬性。You can use the IsInertial property to check whether the event is occurring during inertia.

使用的項目ManipulationDelta發生的事件會在事件發生時不以任何方式影響。The element on with ManipulationDelta event occurs is not affected in any way when the event occurs. 您必須提供的邏輯可操作的項目。You must provide the logic to the element that is to be manipulated. CumulativeManipulationDeltaManipulation屬性,這些型別的屬性ManipulationDelta,包含有關如何變更操作的位置資料,而解譯為移動、 調整其大小或旋轉物件。The CumulativeManipulation and DeltaManipulation properties, which are of type ManipulationDelta, contain data about how the position of the manipulations change and interpreted as moving, resizing, or rotating an object. 您會將該資訊套用至可操作的項目中。You apply that information to the element that is to be manipulated.

如需有關操作的詳細資訊,請參閱輸入概觀For more information about manipulations, see the Input Overview. 如需回應操作的應用程式的範例,請參閱逐步解說:建立您的第一個觸控應用程式For an example of an application that responds to manipulations, see Walkthrough: Creating Your First Touch Application.

路由事件資訊Routed Event Information

識別項欄位Identifier field ManipulationDeltaEvent
路由策略Routing strategy 事件反昇Bubbling
Delegate - 委派Delegate 型別 EventHandler<TEventArgs>ManipulationDeltaEventArgsEventHandler<TEventArgs> of type ManipulationDeltaEventArgs.

適用於