Feature proposal: full open

One key piece of functionality for my app is to swipe fully open (e.g. lots of todo apps have swipe right to mark done). So this would entail:

• fullOpenRightThreshold prop, meaning if the user swipe beyond this threshold (perhaps 0.5 means half the row width), then the row will open (i.e. animate all the way to the right). Animation would ideally progress constantly at the speed of the user’s swipe, unless this would take more than 80ms or something like that. Special case: if the user swiped beyond the threshold and then changed their mind and swiped back toward the left to cancel.
• onFullOpenRight callback, called when the row has opened.
• luxury: renderFullOpenUnderlayRight - as the user approaches the threshold, this fades in over the renderUnderlayRight content.

Any thoughts on this? Will be finishing my D&D work over the next weeks, and can attempt a PR (unless you already have something like this in the works).

[amazingmarvin]

Yeah that makes more sense. Will update with progress.

[amazingmarvin]

I tested it on my phone and it feels great there too. One note: in the README it says onChange has params.snapTo, but it should be params.snapPoint.