ManipulationDelta Class
Contains transformation data that is accumulated when manipulation events occur.
Assembly: PresentationCore (in PresentationCore.dll)
| Name | Description | |
|---|---|---|
![]() | ManipulationDelta(Vector, Double, Vector, Vector) | Initializes a new instance of the ManipulationDelta class. |
| Name | Description | |
|---|---|---|
![]() | Expansion | Gets or sets the amount the manipulation has resized in device-independent units (1/96th inch per unit). |
![]() | Rotation | Gets or sets the rotation of the manipulation in degrees. |
![]() | Scale | Gets or sets the amount the manipulation has resized as a multiplier. |
![]() | Translation | Gets or sets the linear motion of the manipulation. |
| Name | Description | |
|---|---|---|
![]() | Equals(Object) | Determines whether the specified object is equal to the current object.(Inherited from Object.) |
![]() | Finalize() | Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.(Inherited from Object.) |
![]() | GetHashCode() | Serves as the default hash function. (Inherited from Object.) |
![]() | GetType() | |
![]() | MemberwiseClone() | |
![]() | ToString() | Returns a string that represents the current object.(Inherited from Object.) |
The ManipulationDelta class contains information about the changes in the position of a manipulation. Windows Presentation Foundation (WPF) interprets the changes as a Translation, Expansion, or Rotation. When the ManipulationDelta event occurs on a UIElement, use the properties on a ManipulationDelta object to transform the object that should be manipulated. The ManipulationDeltaEventArgs class provides two properties of type ManipulationDelta: DeltaManipulation and CumulativeManipulation.
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 ManipulationDelta event. The example applies the Translation, Scale, and Rotation properties to move, resize, and rotate a Rectangle. 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
Available since 4.0
Silverlight
Available since 4.0
Windows Phone Silverlight
Available since 7.0
Any public static ( Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.


