how to prevent a scatter from being moved outside the app's window?

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MelR

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Jun 9, 2016, 8:56:14 PM6/9/16
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How can a scatter be prevented from being moved outside the app's window?  

When using on_touch_move() it appears (based on touch values) the move has already taken place.  Is there a way to get notified that a move is about to take place; and to then modify that move so the scatter remains entirely in the app's window?
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