/**
+ * Adds mousewheel event support
+ * @module event
+ * @submodule event-mousewheel
+ */
+var DOM_MOUSE_SCROLL = 'DOMMouseScroll',
+ fixArgs = function(args) {
+ var a = Y.Array(args, 0, true), target;
+ if (Y.UA.gecko) {
+ a[0] = DOM_MOUSE_SCROLL;
+ target = Y.config.win;
+ } else {
+ target = Y.config.doc;
+ }
+
+ if (a.length < 3) {
+ a[2] = target;
+ } else {
+ a.splice(2, 0, target);
+ }
+
+ return a;
+ };
+
+/**
+ * Mousewheel event. This listener is automatically attached to the
+ * correct target, so one should not be supplied. Mouse wheel
+ * direction and velocity is stored in the 'mouseDelta' field.
+ * @event mousewheel
+ * @param type {string} 'mousewheel'
+ * @param fn {function} the callback to execute
+ * @param context optional context object
+ * @param args 0..n additional arguments to provide to the listener.
+ * @return {EventHandle} the detach handle
+ * @for YUI
+ */
+Y.Env.evt.plugins.mousewheel = {
+ on: function() {
+ return Y.Event._attach(fixArgs(arguments));
+ },
+
+ detach: function() {
+ return Y.Event.detach.apply(Y.Event, fixArgs(arguments));
+ }
+};
+