In the third part of his Touch Interfaces for WP7 series, Jeff Prosise discusses manipulation events.
Source: Jeff Prosise's Blog
In Part 1 and Part 2 of this series, I described how to build touch interfaces for phone apps using mouse events and Touch.FrameReported events. Part 3 presents yet another way to respond to touch input: manipulation events.
Manipulation events originated in WPF, and they’re substantially richer in WPF than in Silverlight for Windows Phone. Charles Petzold has ably documented the differences in an article of his own. Still, even in their somewhat limited form, manipulation events can be useful in certain scenarios – particularly scenarios involving simple one-finger dragging or panning or, to a lesser extent, scenarios that involve two-finger pinching (typically used for zooming).