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.

Inheritance Hierarchy

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

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

Syntax

Public NotInheritable Class TouchPoint _
    Inherits DependencyObject
public sealed class TouchPoint : DependencyObject

The TouchPoint type exposes the following members.

Constructors

Name Description
TouchPoint Initializes a new instance of the TouchPoint class.

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Properties

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

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Methods

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

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Fields

Name Description
ActionProperty Identifies the Action dependency property.
PositionProperty Identifies the Position dependency property.
SizeProperty Identifies the Size dependency property.
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 Quickstart: Touch input for Windows Phone 8.

Version Information

Windows Phone OS

Supported in: 8.1, 8.0, 7.1, 7.0

Platforms

Windows Phone

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.

See Also

Reference

System.Windows.Input Namespace

GetPrimaryTouchPoint

Touch