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TouchPoint Class

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

Represents a single touch point from a touch message source.

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

public sealed class TouchPoint : DependencyObject

The TouchPoint type exposes the following members.

Public methodTouchPointInitializes a new instance of the TouchPoint class.

Public propertyActionGets the type of action (up, down, move) that the TouchPoint represents.
Public propertyDispatcherGets the Dispatcher this object is associated with. (Inherited from DependencyObject.)
Public propertyPositionGets the X,Y coordinate position of the touch point as a Point.
Public propertySizeGets the rectangular area that is reported as the touch-point contact area.
Public propertyTouchDeviceGets the specific device type that produced the touch point.

Public methodCheckAccessDetermines whether the calling thread has access to this object. (Inherited from DependencyObject.)
Public methodClearValueClears the local value of a dependency property. (Inherited from DependencyObject.)
Public methodEquals(Object)Determines whether the specified Object is equal to the current Object. (Inherited from Object.)
Protected methodFinalizeAllows an object to try to free resources and perform other cleanup operations before the Object is reclaimed by garbage collection. (Inherited from Object.)
Public methodGetAnimationBaseValueReturns any base value established for a Windows Phone dependency property, which would apply in cases where an animation is not active. (Inherited from DependencyObject.)
Public methodGetHashCodeServes as a hash function for a particular type. (Inherited from Object.)
Public methodGetTypeGets the Type of the current instance. (Inherited from Object.)
Public methodGetValueReturns the current effective value of a dependency property from a DependencyObject. (Inherited from DependencyObject.)
Protected methodMemberwiseCloneCreates a shallow copy of the current Object. (Inherited from Object.)
Public methodReadLocalValueReturns the local value of a dependency property, if a local value is set. (Inherited from DependencyObject.)
Public methodSetValueSets the local value of a dependency property on a DependencyObject. (Inherited from DependencyObject.)
Public methodToStringReturns a string that represents the current object. (Inherited from Object.)

Public fieldStatic memberActionPropertyIdentifies the Action dependency property.
Public fieldStatic memberPositionPropertyIdentifies the Position dependency property.
Public fieldStatic memberSizePropertyIdentifies the Size dependency property.
Public fieldStatic memberTouchDevicePropertyIdentifies the TouchDevice dependency property.

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 Quickstart: Touch input for Windows Phone 8.

Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Windows Phone

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