title: Detect multi-touch gesture of touch pad in UWP apps
body: <p>A simple case:</p>
  
  <blockquote>
    <p>Use pinch and pan gesture on a touch pad to zoom an image in a <code>ScrollViewer</code> </p>
  </blockquote>
  
  <p>Note that this is a build-in gesture when you use a touch screen. However, when you do this on your touch pad, nothing is going to happened. </p>
  
  <p>I have looked up official <a href="https://msdn.microsoft.com/en-us/library/windows/apps/dn456353.aspx" rel="nofollow">documents</a> but the topic articles involved just talks about the build-in gestures which is not open to developers. </p>