Hixie 8e279f320e Provide a Draggable that starts on drag
This lets it cooperate with other gestures like tap.

The way I implemented this was to refactor the entire Draggable gesture
logic to use a new kind of gesture detector called
MultiDragGestureRecognizer. It works a bit like
MultiTapGestureRecognizer but for drags.

Also some tweaks to the velocity estimator.
2016-02-11 12:54:10 -08:00
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2016-02-11 12:16:04 -08:00
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