ManipulationDelta Class
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ManipulationDelta Class

 

Contains transformation data that is accumulated when manipulation events occur.

Namespace:   System.Windows.Input
Assembly:  PresentationCore (in PresentationCore.dll)

System.Object
  System.Windows.Input.ManipulationDelta

public class ManipulationDelta

NameDescription
System_CAPS_pubmethodManipulationDelta(Vector, Double, Vector, Vector)

Initializes a new instance of the ManipulationDelta class.

NameDescription
System_CAPS_pubpropertyExpansion

Gets or sets the amount the manipulation has resized in device-independent units (1/96th inch per unit).

System_CAPS_pubpropertyRotation

Gets or sets the rotation of the manipulation in degrees.

System_CAPS_pubpropertyScale

Gets or sets the amount the manipulation has resized as a multiplier.

System_CAPS_pubpropertyTranslation

Gets or sets the linear motion of the manipulation.

NameDescription
System_CAPS_pubmethodEquals(Object)

Determines whether the specified object is equal to the current object.(Inherited from Object.)

System_CAPS_protmethodFinalize()

Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.(Inherited from Object.)

System_CAPS_pubmethodGetHashCode()

Serves as the default hash function. (Inherited from Object.)

System_CAPS_pubmethodGetType()

Gets the Type of the current instance.(Inherited from Object.)

System_CAPS_protmethodMemberwiseClone()

Creates a shallow copy of the current Object.(Inherited from Object.)

System_CAPS_pubmethodToString()

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.

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;
}

.NET Framework
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.

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