/**
* Adds support for a "hover" event. The event provides a convenience wrapper
* for subscribing separately to mouseenter and mouseleave. The signature for
* subscribing to the event is</p>
*
* <pre><code>node.on("hover", overFn, outFn);
* node.delegate("hover", overFn, outFn, ".filterSelector");
* Y.on("hover", overFn, outFn, ".targetSelector");
* Y.delegate("hover", overFn, outFn, "#container", ".filterSelector");
* </code></pre>
*
* <p>Additionally, for compatibility with a more typical subscription
* signature, the following are also supported:</p>
*
* <pre><code>Y.on("hover", overFn, ".targetSelector", outFn);
* Y.delegate("hover", overFn, "#container", outFn, ".filterSelector");
* </code></pre>
*
* @module event
* @submodule event-hover
*/
var isFunction = Y.Lang.isFunction,
noop = function () {},
conf = {
processArgs: function (args) {
// Y.delegate('hover', over, out, '#container', '.filter')
// comes in as ['hover', over, out, '#container', '.filter'], but
// node.delegate('hover', over, out, '.filter')
// comes in as ['hover', over, containerEl, out, '.filter']
var i = isFunction(args[2]) ? 2 : 3;
return (isFunction(args[i])) ? args.splice(i,1)[0] : noop;
},
on: function (node, sub, notifier, filter) {
sub._detach = node[(filter) ? "delegate" : "on"]({
mouseenter: Y.bind(notifier.fire, notifier),
mouseleave: sub._extra
}, filter);
},
detach: function (node, sub, notifier) {
sub._detacher.detach();
}
};
conf.delegate = conf.on;
conf.detachDelegate = conf.detach;
Y.Event.define("hover", conf);