'use strict';

/* --------------------------------------------------------------
 visibility_switcher.js 2015-09-20
 Gambio GmbH
 http://www.gambio.de
 Copyright (c) 2015 Gambio GmbH
 Released under the GNU General Public License (Version 2)
 [http://www.gnu.org/licenses/gpl-2.0.html]
 --------------------------------------------------------------
 */

/**
 * ## Visibility Switcher Extension
 *
 * Use this extension in a parent element to easily define the visibility of child elements during the
 * mouse hover of their containers. When the "mouseleave" event is triggered the children will be hidden.
 *
 * ### Options
 *
 * **Rows | data-visibility_switcher-rows | String | Required**
 *
 * Provide a jQuery selector string which points to the elements that have the "hover" event.
 *
 * **Selections | data-visibility_switcher-selections | String | Required**
 *
 * Provide a jQuery selector string which points to the elements to be displayed upon the "hover" event.
 *
 * ### Example
 *
 * In the following example the .row-action elements will be visible whenever the user hovers above of the
 * `<tr>` element. The initial state of the elements must be hidden (thus the 'hidden' class).
 *
 * ```html
 * <table data-gx-extension="visibility_switcher"
 *       data-visibility_switcher-rows="tr.row"
 *       data-visibility_switcher-selections="i.row-action">
 *   <tr class="row">
 *     <td>#1</td>
 *     <td>John Doe</td>
 *     <td>
 *       <i class="fa fa-pencil row-action edit hidden"></i>
 *       <i class="fa fa-trash row-action delete hidden"></i>
 *     </td>
 *   </tr>
 * </table>
 * ```
 *
 * *Whenever the user hovers at the table rows the .row-action elements will be visible and whenever the
 * mouse leaves the rows they will be hidden.*
 *
 * @module Admin/Extensions/visibility_switcher
 */
gx.extensions.module('visibility_switcher', [], function (data) {

    'use strict';

    // ------------------------------------------------------------------------
    // VARIABLES DEFINITION
    // ------------------------------------------------------------------------

    var
    /**
     * Module Selector
     *
     * @var {object}
     */
    $this = $(this),


    /**
     * Default Options
     *
     * @type {object}
     *
     * @todo Rename 'rows' option to 'containerSelector' and 'selections' to 'childrenSelector'.
     */
    defaults = {
        'rows': '.visibility_switcher',
        'selections': '.tooltip-icon'
    },


    /**
     * Final Options
     *
     * @var {object}
     */
    options = $.extend(true, {}, defaults, data),


    /**
     * Module Object
     *
     * @type {object}
     */
    module = {};

    // ------------------------------------------------------------------------
    // PRIVATE FUNCTIONS
    // ------------------------------------------------------------------------

    var _visibility = function _visibility(e) {
        var $self = $(this);
        $self.filter(options.selections).add($self.find(options.selections)).css('visibility', e.data.state);
    };

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

    module.init = function (done) {

        $this.on('mouseenter', options.rows, { 'state': 'visible' }, _visibility).on('mouseleave', options.rows, { 'state': 'hidden' }, _visibility);

        $this.find(options.rows + ' ' + options.selections).css('visibility', 'hidden');

        done();
    };

    return module;
});
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