'use strict';

/* --------------------------------------------------------------
 sortable.js 2016-09-13
 Gambio GmbH
 http://www.gambio.de
 Copyright (c) 2016 Gambio GmbH
 Released under the GNU General Public License (Version 2)
 [http://www.gnu.org/licenses/gpl-2.0.html]
 --------------------------------------------------------------
 */

/**
 * ## Sortable Extension
 *
 * Uses jQuery UI's sortable plugin to realize sortable functionality. You can pass sortable options via
 * data attributes.
 *
 * ### Options
 *
 * **URL | data-sortable-handle | String | Optional**
 *
 * The destination URL to be used after the user clicks on the element.
 *
 * ### Example
 *
 * ```html
 * <div data-gx-extension="sortable" data-sortable-handle=".drag-handle">
 *   <img src="handle.jpg" class="drag-handle" />
 * </div>
 * ```
 *
 * This extension is based in the jQuery UI sortable interaction utility:
 * {@link http://api.jqueryui.com/sortable}
 *
 * @module Admin/Extensions/sortable
 * @requires jQueryUI
 */
gx.extensions.module('sortable', [jse.source + '/vendor/jquery-ui-dist/jquery-ui.min.css', jse.source + '/vendor/jquery-ui-dist/jquery-ui.min.js'], function (data) {

    'use strict';

    // ------------------------------------------------------------------------
    // VARIABLES
    // ------------------------------------------------------------------------

    // Widget element.

    var $this = $(this);

    // Default widget options (Sortable options).
    var defaults = {
        revert: true,
        containment: 'parent'
    };

    // Widget options.
    var options = $.extend(true, {}, defaults, data);

    // Module instance.
    var module = {};

    // ------------------------------------------------------------------------
    // INITIALIZATION
    // ------------------------------------------------------------------------

    /**
     * Initialize method of the widget, called by the engine.
     */
    module.init = function (done) {
        // Enable sortable.
        $this.sortable(options);

        // Finish initialization.
        done();
    };

    return module;
});
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