It does this by keeping a log of where you're tapping to scroll and then figures out what you're most likely looking at on the remaining viewable portion of the screen.
In the demo on the right you can see the portion of the screen highlighted in red where Movver thinks the user's hand is covering up the display. The green highlighted tiles are areas we've asked movver to keep a calculate focus for - lighest green being most focussed. We can then attach callbacks to these when the focus remains over a certain amount for a specified period of time.
Movver has many use cases:
Have a play with the demo on your phone to see how it works. Download links below...
Note: The debugging flag is turned on in the video above, the highlighted areas would not be visible in a production use case.