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UIElement.ManipulationInertiaStarting Event

Occurs when the input device loses contact with the UIElement object during a manipulation and inertia begins.

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

public event EventHandler<ManipulationInertiaStartingEventArgs> ManipulationInertiaStarting
<object ManipulationInertiaStarting="EventHandler<ManipulationInertiaStartingEventArgs>" .../>

The ManipulationInertiaStarting event occurs when the user lifts all of the fingers from the screen during a manipulation. For example, if a user "throws" a UIElement across a surface, the user will touch the UIElement to begin the action, move the finger across the screen for a short distance, and then release the UIElement. When the user releases the element, inertia begins and the ManipulationInertiaStarting event occurs. The UIElement continues to receive ManipulationDelta events to indicate that inertia is occurring on the element.

You can use this event to specify the behavior of the inertia. For example, you can set the initial velocity that is used when inertia begins. You can also specify the amount of inertia by setting the desired deceleration or by setting the desired placement. You can set these values for each type of manipulation (translation, expansion, or rotation) independently. For more information, see ManipulationInertiaStartingEventArgs.

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 the ManipulationInertiaStarting event handler and sets the desired deceleration for translation, expansion, and rotation that is used during inertia. This example is part of a larger example in Walkthrough: Creating Your First Touch Application.

void Window_InertiaStarting(object sender, ManipulationInertiaStartingEventArgs e)

    // Decrease the velocity of the Rectangle's movement by 
    // 10 inches per second every second.
    // (10 inches * 96 pixels per inch / 1000ms^2)
    e.TranslationBehavior.DesiredDeceleration = 10.0 * 96.0 / (1000.0 * 1000.0);

    // Decrease the velocity of the Rectangle's resizing by 
    // 0.1 inches per second every second.
    // (0.1 inches * 96 pixels per inch / (1000ms^2)
    e.ExpansionBehavior.DesiredDeceleration = 0.1 * 96 / (1000.0 * 1000.0);

    // Decrease the velocity of the Rectangle's rotation rate by 
    // 2 rotations per second every second.
    // (2 * 360 degrees / (1000ms^2)
    e.RotationBehavior.DesiredDeceleration = 720 / (1000.0 * 1000.0);

    e.Handled = true;

.NET Framework

Supported in: 4.5, 4

.NET Framework Client Profile

Supported in: 4

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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