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,"sourcesContent":["// This file is part of Moodle - http://moodle.org/\n//\n// Moodle is free software: you can redistribute it and/or modify\n// it under the terms of the GNU General Public License as published by\n// the Free Software Foundation, either version 3 of the License, or\n// (at your option) any later version.\n//\n// Moodle is distributed in the hope that it will be useful,\n// but WITHOUT ANY WARRANTY; without even the implied warranty of\n// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\n// GNU General Public License for more details.\n//\n// You should have received a copy of the GNU General Public License\n// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.\n\n/**\n * Enhancements to Bootstrap components for accessibility.\n *\n * @module     theme_boost/aria\n * @copyright  2018 Damyon Wiese <[email protected]>\n * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later\n */\ndefine(['jquery', 'core/pending'], function($, Pending) {\n    return {\n        init: function() {\n            // Drop downs from bootstrap don't support keyboard accessibility by default.\n            var focusEnd = false,\n                setFocusEnd = function() {\n                    focusEnd = true;\n                },\n                getFocusEnd = function() {\n                    var result = focusEnd;\n                    focusEnd = false;\n                    return result;\n                };\n\n            // Special handling for \"up\" keyboard control.\n            $('[data-toggle=\"dropdown\"]').keydown(function(e) {\n                var trigger = e.which || e.keyCode,\n                    expanded;\n\n                // Up key opens the menu at the end.\n                if (trigger == 38) {\n                    // Focus the end of the menu, not the beginning.\n                    setFocusEnd();\n                }\n\n                // Escape key only closes the menu, it doesn't open it.\n                if (trigger == 27) {\n                    expanded = $(e.target).attr('aria-expanded');\n                    e.preventDefault();\n                    if (expanded == \"false\") {\n                        $(e.target).click();\n                    }\n                }\n\n                // Space key or Enter key opens the menu.\n                if (trigger == 32 || trigger == 13) {\n                    // Cancel random scroll.\n                    e.preventDefault();\n                    // Open the menu instead.\n                    $(e.target).click();\n                }\n            });\n\n            // Special handling for navigation keys when menu is open.\n            var shiftFocus = function(element) {\n                var delayedFocus = function(pendingPromise) {\n                    $(this).focus();\n                    pendingPromise.resolve();\n                }.bind(element);\n                setTimeout(delayedFocus, 50, new Pending('core/aria:delayed-focus'));\n            };\n\n            $('.dropdown').on('shown.bs.dropdown', function(e) {\n                // We need to focus on the first menuitem.\n                var menu = $(e.target).find('[role=\"menu\"]'),\n                    menuItems = false,\n                    foundMenuItem = false;\n\n                if (menu) {\n                    menuItems = $(menu).find('[role=\"menuitem\"]');\n                }\n                if (menuItems && menuItems.length > 0) {\n                    if (getFocusEnd()) {\n                        foundMenuItem = menuItems[menuItems.length - 1];\n                    } else {\n                        // The first menu entry, pretty reasonable.\n                        foundMenuItem = menuItems[0];\n                    }\n                }\n                if (foundMenuItem) {\n                    shiftFocus(foundMenuItem);\n                }\n            });\n            // Search for menu items by finding the first item that has\n            // text starting with the typed character (case insensitive).\n            $('.dropdown [role=\"menu\"] [role=\"menuitem\"]').keypress(function(e) {\n                var trigger = String.fromCharCode(e.which || e.keyCode),\n                    menu = $(e.target).closest('[role=\"menu\"]'),\n                    i = 0,\n                    menuItems = false,\n                    item,\n                    itemText;\n\n                if (!menu) {\n                    return;\n                }\n                menuItems = $(menu).find('[role=\"menuitem\"]');\n                if (!menuItems) {\n                    return;\n                }\n\n                trigger = trigger.toLowerCase();\n                for (i = 0; i < menuItems.length; i++) {\n                    item = $(menuItems[i]);\n                    itemText = item.text().trim().toLowerCase();\n                    if (itemText.indexOf(trigger) == 0) {\n                        shiftFocus(item);\n                        break;\n                    }\n                }\n            });\n\n            // Keyboard navigation for arrow keys, home and end keys.\n            $('.dropdown [role=\"menu\"] [role=\"menuitem\"]').keydown(function(e) {\n                var trigger = e.which || e.keyCode,\n                    next = false,\n                    menu = $(e.target).closest('[role=\"menu\"]'),\n                    i = 0,\n                    menuItems = false;\n                if (!menu) {\n                    return;\n                }\n                menuItems = $(menu).find('[role=\"menuitem\"]');\n                if (!menuItems) {\n                    return;\n                }\n                // Down key.\n                if (trigger == 40) {\n                    for (i = 0; i < menuItems.length - 1; i++) {\n                        if (menuItems[i] == e.target) {\n                            next = menuItems[i + 1];\n                            break;\n                        }\n                    }\n                    if (!next) {\n                        // Wrap to first item.\n                        next = menuItems[0];\n                    }\n\n                } else if (trigger == 38) {\n                    // Up key.\n                    for (i = 1; i < menuItems.length; i++) {\n                        if (menuItems[i] == e.target) {\n                            next = menuItems[i - 1];\n                            break;\n                        }\n                    }\n                    if (!next) {\n                        // Wrap to last item.\n                        next = menuItems[menuItems.length - 1];\n                    }\n\n                } else if (trigger == 36) {\n                    // Home key.\n                    next = menuItems[0];\n\n                } else if (trigger == 35) {\n                    // End key.\n                    next = menuItems[menuItems.length - 1];\n                }\n                // Variable next is set if we do want to act on the keypress.\n                if (next) {\n                    e.preventDefault();\n                    shiftFocus(next);\n                }\n                return;\n            });\n            $('.dropdown').on('hidden.bs.dropdown', function(e) {\n                // We need to focus on the menu trigger.\n                var trigger = $(e.target).find('[data-toggle=\"dropdown\"]');\n                if (trigger) {\n                    shiftFocus(trigger);\n                }\n            });\n\n            // After page load, focus on any element with special autofocus attribute.\n            window.addEventListener(\"load\", () => {\n                const alerts = document.querySelectorAll('[data-aria-autofocus=\"true\"][role=\"alert\"]');\n                Array.prototype.forEach.call(alerts, autofocusElement => {\n                    // According to the specification an role=\"alert\" region is only read out on change to the content\n                    // of that region.\n                    autofocusElement.innerHTML += ' ';\n                    autofocusElement.removeAttribute('data-aria-autofocus');\n                });\n            });\n        }\n    };\n});\n"],"file":"aria.min.js"}