ManipulationDeltaEventArgs Class
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ManipulationDeltaEventArgs Class

.NET Framework (current version)
 

Provides data for the ManipulationDelta event.

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

System.Object
  System.EventArgs
    System.Windows.RoutedEventArgs
      System.Windows.Input.InputEventArgs
        System.Windows.Input.ManipulationDeltaEventArgs

public sealed class ManipulationDeltaEventArgs : InputEventArgs

NameDescription
System_CAPS_pubpropertyCumulativeManipulation

Gets the cumulated changes of the current manipulation.

System_CAPS_pubpropertyDeltaManipulation

Gets the most recent changes of the current manipulation.

System_CAPS_pubpropertyDevice

Gets the input device that initiated this event.(Inherited from InputEventArgs.)

System_CAPS_pubpropertyHandled

Gets or sets a value that indicates the present state of the event handling for a routed event as it travels the route. (Inherited from RoutedEventArgs.)

System_CAPS_pubpropertyIsInertial

Gets a value that indicates whether the ManipulationDelta event occurs during inertia.

System_CAPS_pubpropertyManipulationContainer

Gets the container that defines the coordinates for the manipulation.

System_CAPS_pubpropertyManipulationOrigin

Gets the point from which the manipulation originated.

System_CAPS_pubpropertyManipulators

Gets a collection of objects that represents the touch contacts for the manipulation.

System_CAPS_pubpropertyOriginalSource

Gets the original reporting source as determined by pure hit testing, before any possible Source adjustment by a parent class.(Inherited from RoutedEventArgs.)

System_CAPS_pubpropertyRoutedEvent

Gets or sets the RoutedEvent associated with this RoutedEventArgs instance. (Inherited from RoutedEventArgs.)

System_CAPS_pubpropertySource

Gets or sets a reference to the object that raised the event. (Inherited from RoutedEventArgs.)

System_CAPS_pubpropertyTimestamp

Gets the time when this event occurred. (Inherited from InputEventArgs.)

System_CAPS_pubpropertyVelocities

Gets the rates of the most recent changes to the manipulation.

NameDescription
System_CAPS_pubmethodCancel()

Cancels the manipulation.

System_CAPS_pubmethodComplete()

Completes the manipulation without inertia.

System_CAPS_pubmethodEquals(Object)

Determines whether the specified object is equal to the current object.(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_pubmethodReportBoundaryFeedback(ManipulationDelta)

Specifies that the manipulation has gone beyond certain boundaries.

System_CAPS_pubmethodStartInertia()

Starts inertia on the manipulation by ignoring subsequent contact movements and raising the ManipulationInertiaStarting event.

System_CAPS_pubmethodToString()

Returns a string that represents the current object.(Inherited from Object.)

The ManipulationDeltaEventArgs class contains data about changes in the position of a manipulation. The DeltaManipulation property contains the changes that occurred since the last ManipulationDelta event occurred. The CumulativeManipulation property contains the total changes that occurred for the current manipulation. You use one of those properties to transform the manipulated object.

You can end a manipulation by calling the Complete method or force the manipulation into inertia by calling the StartInertia method.

The following example shows an event handler for the ManipulationDelta event. The example uses the DeltaManipulation property to move, resize, and rotate a Rectangle. The example also checks whether the ManipulationDelta 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.

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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