Add "swipeAnywhere" attribute

[sethmiles]

This allows a drawer to be opened by swiping in the middle of the screen instead of just the edges.

Mobile Safari sends the browser back or forward on swipes originating from the edge of the screen, making it difficult if not impossible to open a drawer.

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[sethmiles]

I filled out the CLA for myself, thanks.

On Monday, January 12, 2015, googlebot notifications@github.com wrote:

Thanks for your pull request.

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#45 (comment)
.

Seth

[googlebot]

CLAs look good, thanks!

[addyosmani]

This could be neat to support. Do you forsee any issues with landing swipe support for this use-case, @frankiefu?

[ssorallen]

I like the idea, and I think it could be pulled out into a mixin (in 0.8 land) to allow other elements to understand similar gestures. iOS has a UIGestureRecognizer class for encapsulating the logic to know when a gesture has happened. The trackX, trackEnd, trackStart, etc. methods in core-drawer-panel could be moved to a mixin. That might be a better way forward than adding custom logic in multiple elements.

[ssorallen]

polymer-gestures is close to adding swipe: googlearchive/polymer-gestures#50