• Article

TouchPoint Class

Microsoft Silverlight will reach end of support after October 2021. Learn more.

Represents a single touch point from a touch message source.

Inheritance Hierarchy

System.Object
  System.Windows.DependencyObject
    System.Windows.Input.TouchPoint

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

Syntax

'Declaration
Public NotInheritable Class TouchPoint _
    Inherits DependencyObject

public sealed class TouchPoint : DependencyObject

The TouchPoint type exposes the following members.

Constructors

  Name Description
Public methodSupported by Silverlight for Windows Phone TouchPoint Initializes a new instance of the TouchPoint class.

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Properties

  Name Description
Public propertySupported by Silverlight for Windows Phone Action Gets the type of action (up, down, move) that the TouchPoint represents.
Public propertySupported by Silverlight for Windows Phone Dispatcher Gets the Dispatcher this object is associated with. (Inherited from DependencyObject.)
Public propertySupported by Silverlight for Windows Phone Position Gets the X,Y coordinate position of the touch point as a Point.
Public propertySupported by Silverlight for Windows Phone Size Gets the rectangular area that is reported as the touch-point contact area.
Public propertySupported by Silverlight for Windows Phone TouchDevice Gets the specific device type that produced the touch point.

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Methods

  Name Description
Public methodSupported by Silverlight for Windows Phone CheckAccess Determines whether the calling thread has access to this object. (Inherited from DependencyObject.)
Public methodSupported by Silverlight for Windows Phone ClearValue Clears the local value of a dependency property. (Inherited from DependencyObject.)
Public methodSupported by Silverlight for Windows Phone Equals(Object) Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
Protected methodSupported by Silverlight for Windows Phone Finalize Allows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.)
Public methodSupported by Silverlight for Windows Phone GetAnimationBaseValue Returns any base value established for a Silverlight dependency property, which would apply in cases where an animation is not active. (Inherited from DependencyObject.)
Public methodSupported by Silverlight for Windows Phone GetHashCode Serves as a hash function for a particular type. (Inherited from Object.)
Public methodSupported by Silverlight for Windows Phone GetType Gets the Type of the current instance. (Inherited from Object.)
Public methodSupported by Silverlight for Windows Phone GetValue Returns the current effective value of a dependency property from a DependencyObject. (Inherited from DependencyObject.)
Protected methodSupported by Silverlight for Windows Phone MemberwiseClone Creates a shallow copy of the current Object. (Inherited from Object.)
Public methodSupported by Silverlight for Windows Phone ReadLocalValue Returns the local value of a dependency property, if a local value is set. (Inherited from DependencyObject.)
Public methodSupported by Silverlight for Windows Phone SetValue Sets the local value of a dependency property on a DependencyObject. (Inherited from DependencyObject.)
Public methodSupported by Silverlight for Windows Phone ToString Returns a string that represents the current object. (Inherited from Object.)

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Fields

  Name Description
Public fieldStatic memberSupported by Silverlight for Windows Phone ActionProperty Identifies the Action dependency property.
Public fieldStatic memberSupported by Silverlight for Windows Phone PositionProperty Identifies the Position dependency property.
Public fieldStatic memberSupported by Silverlight for Windows Phone SizeProperty Identifies the Size dependency property.
Public fieldStatic memberSupported by Silverlight for Windows Phone TouchDeviceProperty Identifies the TouchDevice dependency property.

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Remarks

You get a TouchPoint value from one of two techniques, both of which require handling the FrameReported event and then working with the TouchFrameEventArgs event data:

  • Call GetPrimaryTouchPoint to get the primary touch point. If you are not processing your own gestures, the primary touch point is often the only data point you need.

  • Call GetTouchPoints. Using the returned collection, work with the TouchPoint items that are relevant to how your application processes touch input.

The Position of a TouchPoint is always the center of its contact area. To get a bounding box for a specified TouchPoint, you can center a bounding box on the Position point, with the dimensions of that bounding box based on Size.

Touch input requires hardware that is touch-sensitive and an environment that supports the infrastructure to expose touch events to individual applications. For more information, see Touch Input in Silverlight.

Version Information

Silverlight

Supported in: 5, 4, 3

Silverlight for Windows Phone

Supported in: Windows Phone OS 7.1, Windows Phone OS 7.0

Platforms

For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.

Thread Safety

Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.