Sindbad~EG File Manager
// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle. If not, see <http://www.gnu.org/licenses/>.
/**
* Enhancements to Bootstrap components for accessibility.
*
* @module theme_boost/aria
* @copyright 2018 Damyon Wiese <damyon@moodle.com>
* @license http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
*/
import $ from 'jquery';
import Pending from 'core/pending';
/**
* Drop downs from bootstrap don't support keyboard accessibility by default.
*/
const dropdownFix = () => {
let focusEnd = false;
const setFocusEnd = (end = true) => {
focusEnd = end;
};
const getFocusEnd = () => {
const result = focusEnd;
focusEnd = false;
return result;
};
// Special handling for navigation keys when menu is open.
const shiftFocus = element => {
const delayedFocus = pendingPromise => {
element.focus();
pendingPromise.resolve();
};
setTimeout(delayedFocus, 50, new Pending('core/aria:delayed-focus'));
};
// Event handling for the dropdown menu button.
const handleMenuButton = e => {
const trigger = e.key;
let fixFocus = false;
// Space key or Enter key opens the menu.
if (trigger === ' ' || trigger === 'Enter') {
fixFocus = true;
// Cancel random scroll.
e.preventDefault();
// Open the menu instead.
e.target.click();
}
// Up and Down keys also open the menu.
if (trigger === 'ArrowUp' || trigger === 'ArrowDown') {
fixFocus = true;
}
if (!fixFocus) {
// No need to fix the focus. Return early.
return;
}
// Fix the focus on the menu items when the menu is opened.
const menu = e.target.parentElement.querySelector('[role="menu"]');
let menuItems = false;
let foundMenuItem = false;
if (menu) {
menuItems = menu.querySelectorAll('[role="menuitem"]');
}
if (menuItems && menuItems.length > 0) {
// Up key opens the menu at the end.
if (trigger === 'ArrowUp') {
setFocusEnd();
} else {
setFocusEnd(false);
}
if (getFocusEnd()) {
foundMenuItem = menuItems[menuItems.length - 1];
} else {
// The first menu entry, pretty reasonable.
foundMenuItem = menuItems[0];
}
}
if (foundMenuItem) {
shiftFocus(foundMenuItem);
}
};
// Search for menu items by finding the first item that has
// text starting with the typed character (case insensitive).
document.addEventListener('keypress', e => {
if (e.target.matches('.dropdown [role="menu"] [role="menuitem"]')) {
const menu = e.target.closest('[role="menu"]');
if (!menu) {
return;
}
const menuItems = menu.querySelectorAll('[role="menuitem"]');
if (!menuItems) {
return;
}
const trigger = e.key.toLowerCase();
for (let i = 0; i < menuItems.length; i++) {
const item = menuItems[i];
const itemText = item.text.trim().toLowerCase();
if (itemText.indexOf(trigger) == 0) {
shiftFocus(item);
break;
}
}
}
});
// Keyboard navigation for arrow keys, home and end keys.
document.addEventListener('keydown', e => {
// We only want to set focus when users access the dropdown via keyboard as per
// guidelines defined in w3 aria practices 1.1 menu-button.
if (e.target.matches('[data-toggle="dropdown"]')) {
handleMenuButton(e);
}
if (e.target.matches('.dropdown [role="menu"] [role="menuitem"]')) {
const trigger = e.key;
let next = false;
const menu = e.target.closest('[role="menu"]');
if (!menu) {
return;
}
const menuItems = menu.querySelectorAll('[role="menuitem"]');
if (!menuItems) {
return;
}
// Down key.
if (trigger == 'ArrowDown') {
for (let i = 0; i < menuItems.length - 1; i++) {
if (menuItems[i] == e.target) {
next = menuItems[i + 1];
break;
}
}
if (!next) {
// Wrap to first item.
next = menuItems[0];
}
} else if (trigger == 'ArrowUp') {
// Up key.
for (let i = 1; i < menuItems.length; i++) {
if (menuItems[i] == e.target) {
next = menuItems[i - 1];
break;
}
}
if (!next) {
// Wrap to last item.
next = menuItems[menuItems.length - 1];
}
} else if (trigger == 'Home') {
// Home key.
next = menuItems[0];
} else if (trigger == 'End') {
// End key.
next = menuItems[menuItems.length - 1];
}
// Variable next is set if we do want to act on the keypress.
if (next) {
e.preventDefault();
shiftFocus(next);
}
return;
}
});
$('.dropdown').on('hidden.bs.dropdown', e => {
// We need to focus on the menu trigger.
const trigger = e.target.querySelector('[data-toggle="dropdown"]');
const focused = document.activeElement != document.body ? document.activeElement : null;
if (trigger && focused && e.target.contains(focused)) {
shiftFocus(trigger);
}
});
};
/**
* A lot of Bootstrap's out of the box features don't work if dropdown items are not focusable.
*/
const comboboxFix = () => {
$(document).on('show.bs.dropdown', e => {
if (e.relatedTarget.matches('[role="combobox"]')) {
const combobox = e.relatedTarget;
const listbox = combobox.parentElement.querySelector('[role="listbox"]');
const selectedOption = listbox.querySelector('[role="option"][aria-selected="true"]');
// To make sure ArrowDown doesn't move the active option afterwards.
setTimeout(() => {
if (selectedOption) {
selectedOption.classList.add('active');
combobox.setAttribute('aria-activedescendant', selectedOption.id);
} else {
const firstOption = listbox.querySelector('[role="option"]');
firstOption.setAttribute('aria-selected', 'true');
firstOption.classList.add('active');
combobox.setAttribute('aria-activedescendant', firstOption.id);
}
}, 0);
}
});
$(document).on('hidden.bs.dropdown', e => {
if (e.relatedTarget.matches('[role="combobox"]')) {
const combobox = e.relatedTarget;
const listbox = combobox.parentElement.querySelector('[role="listbox"]');
combobox.removeAttribute('aria-activedescendant');
setTimeout(() => {
// Undo all previously highlighted options.
listbox.querySelectorAll('.active[role="option"]').forEach(option => {
option.classList.remove('active');
});
}, 0);
}
});
// Handling keyboard events for both navigating through and selecting options.
document.addEventListener('keydown', e => {
if (e.target.matches('.select-menu [role="combobox"]')) {
const combobox = e.target;
const trigger = e.key;
let next = null;
const options = combobox.parentElement.querySelectorAll('[role="listbox"] [role="option"]');
const activeOption = combobox.parentElement.querySelector('[role="listbox"] .active[role="option"]');
// Under the special case that the dropdown menu is being shown as a result of they key press (like when the user
// presses ArrowDown or Enter or ... to open the dropdown menu), activeOption is not set yet.
// It's because of a race condition with show.bs.dropdown event handler.
if (options && activeOption) {
if (trigger == 'ArrowDown') {
for (let i = 0; i < options.length - 1; i++) {
if (options[i] == activeOption) {
next = options[i + 1];
break;
}
}
} if (trigger == 'ArrowUp') {
for (let i = 1; i < options.length; i++) {
if (options[i] == activeOption) {
next = options[i - 1];
break;
}
}
} else if (trigger == 'Home') {
next = options[0];
} else if (trigger == 'End') {
next = options[options.length - 1];
} else if (trigger == ' ' || trigger == 'Enter') {
selectOption(combobox, activeOption);
} else {
// Search for options by finding the first option that has
// text starting with the typed character (case insensitive).
for (let i = 0; i < options.length; i++) {
const option = options[i];
const optionText = option.textContent.trim().toLowerCase();
const keyPressed = e.key.toLowerCase();
if (optionText.indexOf(keyPressed) == 0) {
next = option;
break;
}
}
}
// Variable next is set if we do want to act on the keypress.
if (next) {
e.preventDefault();
activeOption.classList.remove('active');
next.classList.add('active');
combobox.setAttribute('aria-activedescendant', next.id);
}
}
}
});
document.addEventListener('click', e => {
if (e.target.matches('.select-menu [role="option"]')) {
const option = e.target;
const combobox = option.closest('.select-menu').querySelector('[role="combobox"]');
combobox.focus();
selectOption(combobox, option);
}
});
// In case some code somewhere else changes the value of the combobox.
document.addEventListener('change', e => {
if (e.target.matches('.select-menu input[type="hidden"]')) {
const combobox = e.target.parentElement.querySelector('[role="combobox"]');
const option = e.target.parentElement.querySelector(`[role="option"][data-value="${e.target.value}"]`);
if (combobox && option) {
selectOption(combobox, option);
}
}
});
const selectOption = (combobox, option) => {
const oldSelectedOption = combobox.parentElement.querySelector('[role="listbox"] [role="option"][aria-selected="true"]');
const inputElement = combobox.parentElement.querySelector('input[type="hidden"]');
if (oldSelectedOption != option) {
if (oldSelectedOption) {
oldSelectedOption.removeAttribute('aria-selected');
}
option.setAttribute('aria-selected', 'true');
}
combobox.textContent = option.textContent;
if (inputElement.value != option.dataset.value) {
inputElement.value = option.dataset.value;
inputElement.dispatchEvent(new Event('change', {bubbles: true}));
}
};
};
/**
* After page load, focus on any element with special autofocus attribute.
*/
const autoFocus = () => {
window.addEventListener("load", () => {
const alerts = document.querySelectorAll('[data-aria-autofocus="true"][role="alert"]');
Array.prototype.forEach.call(alerts, autofocusElement => {
// According to the specification an role="alert" region is only read out on change to the content
// of that region.
autofocusElement.innerHTML += ' ';
autofocusElement.removeAttribute('data-aria-autofocus');
});
});
};
/**
* Changes the focus to the correct tab based on the key that is pressed.
* @param {KeyboardEvent} e
*/
const updateTabFocus = e => {
const tabList = e.target.closest('[role="tablist"]');
const vertical = tabList.getAttribute('aria-orientation') == 'vertical';
const rtl = window.right_to_left();
const arrowNext = vertical ? 'ArrowDown' : (rtl ? 'ArrowLeft' : 'ArrowRight');
const arrowPrevious = vertical ? 'ArrowUp' : (rtl ? 'ArrowRight' : 'ArrowLeft');
const tabs = Array.prototype.filter.call(
tabList.querySelectorAll('[role="tab"]'),
tab => !!tab.offsetHeight); // We only work with the visible tabs.
for (let i = 0; i < tabs.length; i++) {
tabs[i].index = i;
}
switch (e.key) {
case arrowNext:
e.preventDefault();
if (e.target.index !== undefined && tabs[e.target.index + 1]) {
tabs[e.target.index + 1].focus();
} else {
tabs[0].focus();
}
break;
case arrowPrevious:
e.preventDefault();
if (e.target.index !== undefined && tabs[e.target.index - 1]) {
tabs[e.target.index - 1].focus();
} else {
tabs[tabs.length - 1].focus();
}
break;
case 'Home':
e.preventDefault();
tabs[0].focus();
break;
case 'End':
e.preventDefault();
tabs[tabs.length - 1].focus();
}
};
/**
* Fix accessibility issues regarding tab elements focus and their tab order in Bootstrap navs.
*/
const tabElementFix = () => {
document.addEventListener('keydown', e => {
if (['ArrowUp', 'ArrowDown', 'ArrowLeft', 'ArrowRight', 'Home', 'End'].includes(e.key)) {
if (e.target.matches('[role="tablist"] [role="tab"]')) {
updateTabFocus(e);
}
}
});
document.addEventListener('click', e => {
if (e.target.matches('[role="tablist"] [data-toggle="tab"], [role="tablist"] [data-toggle="pill"]')) {
const tabs = e.target.closest('[role="tablist"]').querySelectorAll('[data-toggle="tab"], [data-toggle="pill"]');
e.preventDefault();
$(e.target).tab('show');
tabs.forEach(tab => {
tab.tabIndex = -1;
});
e.target.tabIndex = 0;
}
});
};
/**
* Fix keyboard interaction with Bootstrap Collapse elements.
*
* @see {@link https://www.w3.org/TR/wai-aria-practices-1.1/#disclosure|WAI-ARIA Authoring Practices 1.1 - Disclosure (Show/Hide)}
*/
const collapseFix = () => {
document.addEventListener('keydown', e => {
if (e.target.matches('[data-toggle="collapse"]')) {
// Pressing space should toggle expand/collapse.
if (e.key === ' ') {
e.preventDefault();
e.target.click();
}
}
});
};
export const init = () => {
dropdownFix();
comboboxFix();
autoFocus();
tabElementFix();
collapseFix();
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