Proton is a declarative multitouch framework that allows developers to specify gestures as regular expressions of touch event symbols. Proton converts the touch events outputted by multitouch hardware into a stream of touch event symbols that encode the touch action (down, move, and up), touch ID (e.g., first touch, second touch, etc.) and custom touch attributes (e.g., touch hit-target, touch direction, etc.). Developers describe multitouch gestures as regular expressions of these symbols, which Proton matches against the touch event stream.
To get started read the tutorial.
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Released under BSD license.