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// This file is part of Moodle - http://moodle.org/
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//
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// Moodle is free software: you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// Moodle is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
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/**
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* Controls the drawer.
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*
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* @module core/drawer
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* @copyright 2019 Jun Pataleta <jun@moodle.com>
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* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
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*/
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import $ from 'jquery';
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import * as PubSub from 'core/pubsub';
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import * as Aria from 'core/aria';
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import DrawerEvents from 'core/drawer_events';
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/**
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* Show the drawer.
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*
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* @param {Object} root The drawer container.
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*/
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const show = root => {
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// Ensure that it is a jQuery.
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root = $(root);
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Aria.unhide(root.get());
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root.removeClass('hidden');
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root.focus();
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PubSub.publish(DrawerEvents.DRAWER_SHOWN, root);
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};
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/**
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* Hide the drawer.
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*
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* @param {Object} root The drawer container.
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*/
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const hide = root => {
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// Ensure that it is a jQuery.
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root = $(root);
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root.addClass('hidden');
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Aria.hide(root.get());
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PubSub.publish(DrawerEvents.DRAWER_HIDDEN, root);
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};
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/**
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* Check if the drawer is visible.
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*
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* @param {Object} root The drawer container.
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* @return {boolean}
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*/
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const isVisible = (root) => {
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let isHidden = root.hasClass('hidden');
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return !isHidden;
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};
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/**
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* Toggle the drawer visibility.
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*
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* @param {Object} root The drawer container.
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*/
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const toggle = (root) => {
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if (isVisible(root)) {
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hide(root);
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} else {
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show(root);
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}
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};
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/**
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* Add event listeners to toggle the drawer.
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*
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* @param {Object} root The drawer container.
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* @param {Object} toggleElements The toggle elements.
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*/
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const registerToggles = (root, toggleElements) => {
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let openTrigger = null;
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toggleElements.attr('aria-expanded', isVisible(root));
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toggleElements.on('click', (e) => {
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e.preventDefault();
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const wasVisible = isVisible(root);
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toggle(root);
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toggleElements.attr('aria-expanded', !wasVisible);
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if (!wasVisible) {
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// Remember which trigger element opened the drawer.
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openTrigger = toggleElements.filter((index, element) => {
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return element == e.target || element.contains(e.target);
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});
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} else if (openTrigger) {
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// The drawer has gone from open to close so we need to set the focus back
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// to the element that openend it.
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openTrigger.focus();
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openTrigger = null;
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}
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});
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};
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/**
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* Find the root element of the drawer based on the using the drawer content root's ID.
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*
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* @param {Object} contentRoot The drawer content's root element.
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* @returns {*|jQuery}
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*/
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const getDrawerRoot = (contentRoot) => {
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contentRoot = $(contentRoot);
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return contentRoot.closest('[data-region="right-hand-drawer"]');
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};
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export default {
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hide: hide,
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show: show,
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isVisible: isVisible,
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toggle: toggle,
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registerToggles: registerToggles,
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getDrawerRoot: getDrawerRoot
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};
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