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Microsoft® Silverlight® Edition: Programming Windows® Phone 7 by Charles Petzold

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Low-Level Touch Events in Silverlight

Like XNA, Silverlight also supports two different programming interfaces for working with multi-touch, which can be most easily categorized as low-level and high-level. The low-level interface is based around the static Touch.FrameReported event, which is very similar to the XNA TouchPanel except that it’s an event and it doesn’t include gestures.

The high-level interface consists of three events defined by the UIElement class: ManipulationStarted, ManipulationDelta, and ManipulationCompleted. The Manipulation events, as they’re collectively called, consolidate the interaction of multiple fingers into movement and scaling factors.

The core of the low-level touch interface in Silverlight is a class called TouchPoint ...

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