UIElement.ManipulationDelta Evento

Definición

Se produce cuando el dispositivo de entrada cambia de posición durante una manipulación.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) 

Ejemplos

En el ejemplo siguiente se muestra un controlador de eventos para el evento ManipulationDelta.The following example shows an event handler for the ManipulationDelta event. En el ejemplo se usa la propiedad DeltaManipulation para desplazar, cambiar el tamaño y girar un Rectangle.The example uses the DeltaManipulation property to move, resize, and rotate a Rectangle. En el ejemplo también se comprueba si el evento de ManipulationDelta se produjo durante la inercia y si el rectángulo está tocando el borde de una ventana.The example also checks whether the ManipulationDelta event occurred during inertia and whether the rectangle is touching the edge of a window. Si esos casos son true, la aplicación detiene la manipulación para evitar que el rectángulo deje el área visible de la aplicación.If those cases are true, the application stops the manipulation to prevent the rectangle from leaving the visible area of the application. Este ejemplo forma parte de un ejemplo más grande en Tutorial: Crear la primera aplicación táctil.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

Comentarios

El evento ManipulationDelta se produce varias veces cuando el usuario arrastra los dedos sobre la pantalla durante una manipulación y otra vez cuando se produce la inercia.The ManipulationDelta event occurs multiple times when the user drags fingers over the screen during a manipulation and again when inertia occurs. Puede usar la propiedad IsInertial para comprobar si el evento se está produciendo durante la inercia.You can use the IsInertial property to check whether the event is occurring during inertia.

El elemento que se encuentra en con ManipulationDelta evento no se ve afectado de ninguna manera cuando se produce el evento.The element on with ManipulationDelta event occurs is not affected in any way when the event occurs. Debe proporcionar la lógica al elemento que se va a manipular.You must provide the logic to the element that is to be manipulated. Las propiedades CumulativeManipulation y DeltaManipulation, que son de tipo ManipulationDelta, contienen datos sobre cómo cambia la posición de las manipulaciones y cómo se interpreta como mover, cambiar de tamaño o girar un objeto.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. La información se aplica al elemento que se va a manipular.You apply that information to the element that is to be manipulated.

Para obtener más información sobre las manipulaciones, vea Introducción a la entrada.For more information about manipulations, see the Input Overview. Para obtener un ejemplo de una aplicación que responde a las manipulaciones, vea Tutorial: Crear la primera aplicación táctil.For an example of an application that responds to manipulations, see Walkthrough: Creating Your First Touch Application.

Información sobre eventos enrutadosRouted Event Information

Campo de identificadorIdentifier field ManipulationDeltaEvent
Estrategia de enrutamientoRouting strategy PropagaciónBubbling
delegadoDelegate EventHandler<TEventArgs> de tipo ManipulationDeltaEventArgs.EventHandler<TEventArgs> of type ManipulationDeltaEventArgs.

Se aplica a