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/**
 * AutoRefresh Plugin
 * @version 2.3.4
 * @author Artus Kolanowski
 * @author David Deutsch
 * @license The MIT License (MIT)
 */
;(function($, window, document, undefined) {

	/**
	 * Creates the auto refresh plugin.
	 * @class The Auto Refresh Plugin
	 * @param {Owl} carousel - The Owl Carousel
	 */
	var AutoRefresh = function(carousel) {
		/**
		 * Reference to the core.
		 * @protected
		 * @type {Owl}
		 */
		this._core = carousel;

		/**
		 * Refresh interval.
		 * @protected
		 * @type {number}
		 */
		this._interval = null;

		/**
		 * Whether the element is currently visible or not.
		 * @protected
		 * @type {Boolean}
		 */
		this._visible = null;

		/**
		 * All event handlers.
		 * @protected
		 * @type {Object}
		 */
		this._handlers = {
			'initialized.owl.carousel': $.proxy(function(e) {
				if (e.namespace && this._core.settings.autoRefresh) {
					this.watch();
				}
			}, this)
		};

		// set default options
		this._core.options = $.extend({}, AutoRefresh.Defaults, this._core.options);

		// register event handlers
		this._core.$element.on(this._handlers);
	};

	/**
	 * Default options.
	 * @public
	 */
	AutoRefresh.Defaults = {
		autoRefresh: true,
		autoRefreshInterval: 500
	};

	/**
	 * Watches the element.
	 */
	AutoRefresh.prototype.watch = function() {
		if (this._interval) {
			return;
		}

		this._visible = this._core.isVisible();
		this._interval = window.setInterval($.proxy(this.refresh, this), this._core.settings.autoRefreshInterval);
	};

	/**
	 * Refreshes the element.
	 */
	AutoRefresh.prototype.refresh = function() {
		if (this._core.isVisible() === this._visible) {
			return;
		}

		this._visible = !this._visible;

		this._core.$element.toggleClass('owl-hidden', !this._visible);

		this._visible && (this._core.invalidate('width') && this._core.refresh());
	};

	/**
	 * Destroys the plugin.
	 */
	AutoRefresh.prototype.destroy = function() {
		var handler, property;

		window.clearInterval(this._interval);

		for (handler in this._handlers) {
			this._core.$element.off(handler, this._handlers[handler]);
		}
		for (property in Object.getOwnPropertyNames(this)) {
			typeof this[property] != 'function' && (this[property] = null);
		}
	};

	$.fn.owlCarousel.Constructor.Plugins.AutoRefresh = AutoRefresh;

})(window.Zepto || window.jQuery, window, document);