Occurs when the input device changes position during a manipulation.
Assembly: PresentationCore (in PresentationCore.dll)
XMLNS for XAML: http://schemas.microsoft.com/winfx/2006/xaml/presentation, http://schemas.microsoft.com/netfx/2007/xaml/presentation
The event occurs multiple times when the user drags fingers over the screen during a manipulation and again when inertia occurs. You can use the IsInertial property to check whether the event is occurring during inertia.
The element on with event occurs is not affected in any way when the event occurs. You must provide the logic to the element that is to be manipulated. 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. You apply that information to the element that is to be manipulated.
For more information about manipulations, see the Input Overview. For an example of an application that responds to manipulations, see Walkthrough: Creating Your First Touch Application.
The following example shows an event handler for the event. The example uses the DeltaManipulation property to move, resize, and rotate a Rectangle. The example also checks whether the event occurred during inertia and whether the rectangle is touching the edge of a window. If those cases are true, the application stops the manipulation to prevent the rectangle from leaving the visible area of the application. This example is part of a larger example in Walkthrough: Creating Your First Touch Application.
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