摘要 |
<p>The subject matter of this specification can be embodied in, among other things, a system that includes a tracking device to generate movement inform ation for use in moving a user interface object on a graphical user interfac e. The tracking device is configured to receive at least a portion of a user 's finger. The system also includes a base device configured to receive the tracking device. The base device is configured to translate movement of the base device relative to an adjacent surface for use in moving the user inter face object.</p> |