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✏️ Editing: KeyboardNavigation.js

/**
 * KeyboardNavigation.js
 *
 * Released under LGPL License.
 * Copyright (c) 1999-2015 Ephox Corp. All rights reserved
 *
 * License: http://www.tinymce.com/license
 * Contributing: http://www.tinymce.com/contributing
 */

/**
 * This class handles keyboard navigation of controls and elements.
 *
 * @class tinymce.ui.KeyboardNavigation
 */
define("tinymce/ui/KeyboardNavigation", [
], function() {
	"use strict";

/**
	 * This class handles all keyboard navigation for WAI-ARIA support. Each root container
	 * gets an instance of this class.
	 *
	 * @constructor
	 */
	return function(settings) {
		var root = settings.root, focusedElement, focusedControl;

function isElement(node) {
			return node && node.nodeType === 1;
		}

try {
			focusedElement = document.activeElement;
		} catch (ex) {
			// IE sometimes fails to return a proper element
			focusedElement = document.body;
		}

focusedControl = root.getParentCtrl(focusedElement);

/**
		 * Returns the currently focused elements wai aria role of the currently
		 * focused element or specified element.
		 *
		 * @private
		 * @param {Element} elm Optional element to get role from.
		 * @return {String} Role of specified element.
		 */
		function getRole(elm) {
			elm = elm || focusedElement;

if (isElement(elm)) {
				return elm.getAttribute('role');
			}

return null;
		}

/**
		 * Returns the wai role of the parent element of the currently
		 * focused element or specified element.
		 *
		 * @private
		 * @param {Element} elm Optional element to get parent role from.
		 * @return {String} Role of the first parent that has a role.
		 */
		function getParentRole(elm) {
			var role, parent = elm || focusedElement;

while ((parent = parent.parentNode)) {
				if ((role = getRole(parent))) {
					return role;
				}
			}
		}

/**
		 * Returns a wai aria property by name for example aria-selected.
		 *
		 * @private
		 * @param {String} name Name of the aria property to get for example "disabled".
		 * @return {String} Aria property value.
		 */
		function getAriaProp(name) {
			var elm = focusedElement;

if (isElement(elm)) {
				return elm.getAttribute('aria-' + name);
			}
		}

/**
		 * Is the element a text input element or not.
		 *
		 * @private
		 * @param {Element} elm Element to check if it's an text input element or not.
		 * @return {Boolean} True/false if the element is a text element or not.
		 */
		function isTextInputElement(elm) {
			var tagName = elm.tagName.toUpperCase();

// Notice: since type can be "email" etc we don't check the type
			// So all input elements gets treated as text input elements
			return tagName == "INPUT" || tagName == "TEXTAREA";
		}

/**
		 * Returns true/false if the specified element can be focused or not.
		 *
		 * @private
		 * @param {Element} elm DOM element to check if it can be focused or not.
		 * @return {Boolean} True/false if the element can have focus.
		 */
		function canFocus(elm) {
			if (isTextInputElement(elm) && !elm.hidden) {
				return true;
			}

if (/^(button|menuitem|checkbox|tab|menuitemcheckbox|option|gridcell)$/.test(getRole(elm))) {
				return true;
			}

return false;
		}

/**
		 * Returns an array of focusable visible elements within the specified container element.
		 *
		 * @private
		 * @param {Element} elm DOM element to find focusable elements within.
		 * @return {Array} Array of focusable elements.
		 */
		function getFocusElements(elm) {
			var elements = [];

function collect(elm) {
				if (elm.nodeType != 1 || elm.style.display == 'none') {
					return;
				}

if (canFocus(elm)) {
					elements.push(elm);
				}

for (var i = 0; i < elm.childNodes.length; i++) {
					collect(elm.childNodes[i]);
				}
			}

collect(elm || root.getEl());

return elements;
		}

/**
		 * Returns the navigation root control for the specified control. The navigation root
		 * is the control that the keyboard navigation gets scoped to for example a menubar or toolbar group.
		 * It will look for parents of the specified target control or the currently focused control if this option is omitted.
		 *
		 * @private
		 * @param {tinymce.ui.Control} targetControl Optional target control to find root of.
		 * @return {tinymce.ui.Control} Navigation root control.
		 */
		function getNavigationRoot(targetControl) {
			var navigationRoot, controls;

targetControl = targetControl || focusedControl;
			controls = targetControl.parents().toArray();
			controls.unshift(targetControl);

for (var i = 0; i < controls.length; i++) {
				navigationRoot = controls[i];

if (navigationRoot.settings.ariaRoot) {
					break;
				}
			}

return navigationRoot;
		}

/**
		 * Focuses the first item in the specified targetControl element or the last aria index if the
		 * navigation root has the ariaRemember option enabled.
		 *
		 * @private
		 * @param {tinymce.ui.Control} targetControl Target control to focus the first item in.
		 */
		function focusFirst(targetControl) {
			var navigationRoot = getNavigationRoot(targetControl);
			var focusElements = getFocusElements(navigationRoot.getEl());

if (navigationRoot.settings.ariaRemember && "lastAriaIndex" in navigationRoot) {
				moveFocusToIndex(navigationRoot.lastAriaIndex, focusElements);
			} else {
				moveFocusToIndex(0, focusElements);
			}
		}

/**
		 * Moves the focus to the specified index within the elements list.
		 * This will scope the index to the size of the element list if it changed.
		 *
		 * @private
		 * @param {Number} idx Specified index to move to.
		 * @param {Array} elements Array with dom elements to move focus within.
		 * @return {Number} Input index or a changed index if it was out of range.
		 */
		function moveFocusToIndex(idx, elements) {
			if (idx < 0) {
				idx = elements.length - 1;
			} else if (idx >= elements.length) {
				idx = 0;
			}

if (elements[idx]) {
				elements[idx].focus();
			}

return idx;
		}

/**
		 * Moves the focus forwards or backwards.
		 *
		 * @private
		 * @param {Number} dir Direction to move in positive means forward, negative means backwards.
		 * @param {Array} elements Optional array of elements to move within defaults to the current navigation roots elements.
		 */
		function moveFocus(dir, elements) {
			var idx = -1, navigationRoot = getNavigationRoot();

elements = elements || getFocusElements(navigationRoot.getEl());

for (var i = 0; i < elements.length; i++) {
				if (elements[i] === focusedElement) {
					idx = i;
				}
			}

idx += dir;
			navigationRoot.lastAriaIndex = moveFocusToIndex(idx, elements);
		}

/**
		 * Moves the focus to the left this is called by the left key.
		 *
		 * @private
		 */
		function left() {
			var parentRole = getParentRole();

if (parentRole == "tablist") {
				moveFocus(-1, getFocusElements(focusedElement.parentNode));
			} else if (focusedControl.parent().submenu) {
				cancel();
			} else {
				moveFocus(-1);
			}
		}

/**
		 * Moves the focus to the right this is called by the right key.
		 *
		 * @private
		 */
		function right() {
			var role = getRole(), parentRole = getParentRole();

if (parentRole == "tablist") {
				moveFocus(1, getFocusElements(focusedElement.parentNode));
			} else if (role == "menuitem" && parentRole == "menu" && getAriaProp('haspopup')) {
				enter();
			} else {
				moveFocus(1);
			}
		}

/**
		 * Moves the focus to the up this is called by the up key.
		 *
		 * @private
		 */
		function up() {
			moveFocus(-1);
		}

/**
		 * Moves the focus to the up this is called by the down key.
		 *
		 * @private
		 */
		function down() {
			var role = getRole(), parentRole = getParentRole();

if (role == "menuitem" && parentRole == "menubar") {
				enter();
			} else if (role == "button" && getAriaProp('haspopup')) {
				enter({key: 'down'});
			} else {
				moveFocus(1);
			}
		}

/**
		 * Moves the focus to the next item or previous item depending on shift key.
		 *
		 * @private
		 * @param {DOMEvent} e DOM event object.
		 */
		function tab(e) {
			var parentRole = getParentRole();

if (parentRole == "tablist") {
				var elm = getFocusElements(focusedControl.getEl('body'))[0];

if (elm) {
					elm.focus();
				}
			} else {
				moveFocus(e.shiftKey ? -1 : 1);
			}
		}

/**
		 * Calls the cancel event on the currently focused control. This is normally done using the Esc key.
		 *
		 * @private
		 */
		function cancel() {
			focusedControl.fire('cancel');
		}

/**
		 * Calls the click event on the currently focused control. This is normally done using the Enter/Space keys.
		 *
		 * @private
		 * @param {Object} aria Optional aria data to pass along with the enter event.
		 */
		function enter(aria) {
			aria = aria || {};
			focusedControl.fire('click', {target: focusedElement, aria: aria});
		}

root.on('keydown', function(e) {
			function handleNonTabOrEscEvent(e, handler) {
				// Ignore non tab keys for text elements
				if (isTextInputElement(focusedElement)) {
					return;
				}

if (handler(e) !== false) {
					e.preventDefault();
				}
			}

if (e.isDefaultPrevented()) {
				return;
			}

switch (e.keyCode) {
				case 37: // DOM_VK_LEFT
					handleNonTabOrEscEvent(e, left);
					break;

case 39: // DOM_VK_RIGHT
					handleNonTabOrEscEvent(e, right);
					break;

case 38: // DOM_VK_UP
					handleNonTabOrEscEvent(e, up);
					break;

case 40: // DOM_VK_DOWN
					handleNonTabOrEscEvent(e, down);
					break;

case 27: // DOM_VK_ESCAPE
					cancel();
					break;

case 14: // DOM_VK_ENTER
				case 13: // DOM_VK_RETURN
				case 32: // DOM_VK_SPACE
					handleNonTabOrEscEvent(e, enter);
					break;

case 9: // DOM_VK_TAB
					if (tab(e) !== false) {
						e.preventDefault();
					}
					break;
			}
		});

root.on('focusin', function(e) {
			focusedElement = e.target;
			focusedControl = e.control;
		});

return {
			focusFirst: focusFirst
		};
	};
});

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