Adding sound support.

[drio]

Discussion about this here.

[mbostock]

I’m not inclined to add this to the library given that you can pretty easily implement it using the existing API (using activate / deactivate events plus a key event listener).

[drio]

But you would still need all the sounds.js logic. I can rewrite it so we use activate/deactivate events. Would that be fine? If not, that's alright, please close both the PR and the issue.

Thanks for looking into this Mike.

[mbostock]

Right, but I think that would make more sense in a separate library + example. If I can, I’d rather keep this library as small & simple as possible.

[drio]

Ok, makes sense. I will keep it in my account. I will send you the link, just in case you want to add it to the stacks' readme.

[drio]

How can I attach my listeners to the activate/deactivate events from outside stack? Should we expose event?

[mbostock]

stack.on("activate", function(i) { console.log(d3.event, i); })

[drio]

Thanks Mike. Ah.. you are actually rebinding on to the stack object.