TouchPoint Class
Represents a single touch point from a touch message source.
Namespace: System.Windows.Input
Assembly: System.Windows (in System.Windows.dll)
The TouchPoint type exposes the following members.
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Action | Gets the type of action (up, down, move) that the TouchPoint represents. |
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Dispatcher | Gets the Dispatcher this object is associated with. (Inherited from DependencyObject.) |
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Position | Gets the X,Y coordinate position of the touch point as a Point. |
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Size | Gets the rectangular area that is reported as the touch-point contact area. |
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TouchDevice | Gets the specific device type that produced the touch point. |
| Name | Description | |
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CheckAccess | Determines whether the calling thread has access to this object. (Inherited from DependencyObject.) |
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ClearValue | Clears the local value of a dependency property. (Inherited from DependencyObject.) |
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Equals(Object) | Determines whether the specified Object is equal to the current Object. (Inherited from Object.) |
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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.) |
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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.) |
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GetHashCode | Serves as a hash function for a particular type. (Inherited from Object.) |
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GetType | Gets the Type of the current instance. (Inherited from Object.) |
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GetValue | Returns the current effective value of a dependency property from a DependencyObject. (Inherited from DependencyObject.) |
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MemberwiseClone | Creates a shallow copy of the current Object. (Inherited from Object.) |
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ReadLocalValue | Returns the local value of a dependency property, if a local value is set. (Inherited from DependencyObject.) |
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SetValue | Sets the local value of a dependency property on a DependencyObject. (Inherited from DependencyObject.) |
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ToString | Returns a string that represents the current object. (Inherited from Object.) |
| Name | Description | |
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ActionProperty | Identifies the Action dependency property. |
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PositionProperty | Identifies the Position dependency property. |
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SizeProperty | Identifies the Size dependency property. |
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TouchDeviceProperty | Identifies 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:
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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.
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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.
For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.
