/*
 * jQuery UI Carousel Plugin v0.3 - Auto Scroll Extension
 *
 * Copyright (c) 2011 Richard Scarrott
 *
 * Dual licensed under the MIT and GPL licenses:
 * http://www.opensource.org/licenses/mit-license.php
 * http://www.gnu.org/licenses/gpl.html
 *
 * Requires:
 * jQuery v1.4+,
 * jQuery UI Widget Factory 1.8+
 * jQuery UI Carousel 0.5+
 *
 */

(function($, carousel, undefined) {

	var _create = carousel._create,
		destroy = carousel.destroy;

	$.extend(carousel.options, {
		pause: 5000,
		autoScroll: false
	});

	$.extend(carousel, {

		_create: function() {

			_create.apply(this);

			if (!this.options.autoScroll) { return; }

			this.start();
			this.element
				.bind('mouseenter.carousel', $.proxy(this, 'stop'))
				.bind('mouseleave.carousel', $.proxy(this, 'start'));

		},

		start: function() {

			var self = this;

			this._interval = setInterval(function() {

				self.itemIndex = self.itemIndex + self.options.itemsPerTransition;
				if (self.itemIndex > (self.noOfItems - 1)) {
					self.itemIndex = 0;
				}

				self._go();

			}, this.options.pause);

		},

		stop: function() {
			clearInterval(this._interval);
		},

		destroy: function() {

			destroy.apply(this);
			this.stop();

		}

	});

})(jQuery, jQuery.ui.carousel.prototype);