Explore feasibility of `event-drag` module

[tilomitra]

An event-drag module would simplify the story around gesture events in YUI.

Currently, you can do this:

node.on('tap', doThis);
node.on('flick', doThat);

But if you want to drag something around, you have to do this:

var dd = new Y.DD.Drag({ ... });
dd.on('drag:drag', doThisToo);

This should be simplified to this:

node.on('drag', doThisToo)

I think we can do this by having an event-drag module that instantiates and sets up Y.DD under the hood, but I need to look into it.

[lsmith]

http://yuilibrary.com/gallery/show/event-drag

[tilomitra]

@lsmith: This is great! I think we should pull this into YUI. What do you think?

[lsmith]

It's pre-synth system, so it would need some work, but you're welcome to see how easy it would be to migrate. There was some concern when I wrote it about colliding with native DOM event names. IIRC, only "drag" was the culprit there, but it is (obviously) the most intuitive name for that event.
As a synth, supporting delegation could cause issues, but documenting that delegation is not (yet) supported might be enough.

[tilomitra]

@lsmith Sounds good, thanks for the heads-up. I think it's fine to not support delegation early on, since people can revert to DD.Delegate in that case. event-flick also doesn't support delegation. I'll try to make this into a synthetic event and report back. This is a good starting point!