File: /var/www/vhost/disk-apps/pwa.sports-crowd.com/node_modules/@angular/cdk/fesm2022/a11y.mjs
import { DOCUMENT } from '@angular/common';
import * as i0 from '@angular/core';
import { inject, APP_ID, Injectable, Inject, QueryList, Directive, Input, InjectionToken, Optional, EventEmitter, Output, NgModule } from '@angular/core';
import * as i1 from '@angular/cdk/platform';
import { _getFocusedElementPierceShadowDom, normalizePassiveListenerOptions, _getEventTarget, _getShadowRoot } from '@angular/cdk/platform';
import { Subject, Subscription, BehaviorSubject, of } from 'rxjs';
import { hasModifierKey, A, Z, ZERO, NINE, PAGE_DOWN, PAGE_UP, END, HOME, LEFT_ARROW, RIGHT_ARROW, UP_ARROW, DOWN_ARROW, TAB, ALT, CONTROL, MAC_META, META, SHIFT } from '@angular/cdk/keycodes';
import { tap, debounceTime, filter, map, take, skip, distinctUntilChanged, takeUntil } from 'rxjs/operators';
import { coerceBooleanProperty, coerceElement } from '@angular/cdk/coercion';
import * as i1$1 from '@angular/cdk/observers';
import { ObserversModule } from '@angular/cdk/observers';
import { BreakpointObserver } from '@angular/cdk/layout';
/** IDs are delimited by an empty space, as per the spec. */
const ID_DELIMITER = ' ';
/**
* Adds the given ID to the specified ARIA attribute on an element.
* Used for attributes such as aria-labelledby, aria-owns, etc.
*/
function addAriaReferencedId(el, attr, id) {
const ids = getAriaReferenceIds(el, attr);
if (ids.some(existingId => existingId.trim() == id.trim())) {
return;
}
ids.push(id.trim());
el.setAttribute(attr, ids.join(ID_DELIMITER));
}
/**
* Removes the given ID from the specified ARIA attribute on an element.
* Used for attributes such as aria-labelledby, aria-owns, etc.
*/
function removeAriaReferencedId(el, attr, id) {
const ids = getAriaReferenceIds(el, attr);
const filteredIds = ids.filter(val => val != id.trim());
if (filteredIds.length) {
el.setAttribute(attr, filteredIds.join(ID_DELIMITER));
}
else {
el.removeAttribute(attr);
}
}
/**
* Gets the list of IDs referenced by the given ARIA attribute on an element.
* Used for attributes such as aria-labelledby, aria-owns, etc.
*/
function getAriaReferenceIds(el, attr) {
// Get string array of all individual ids (whitespace delimited) in the attribute value
return (el.getAttribute(attr) || '').match(/\S+/g) || [];
}
/**
* ID used for the body container where all messages are appended.
* @deprecated No longer being used. To be removed.
* @breaking-change 14.0.0
*/
const MESSAGES_CONTAINER_ID = 'cdk-describedby-message-container';
/**
* ID prefix used for each created message element.
* @deprecated To be turned into a private variable.
* @breaking-change 14.0.0
*/
const CDK_DESCRIBEDBY_ID_PREFIX = 'cdk-describedby-message';
/**
* Attribute given to each host element that is described by a message element.
* @deprecated To be turned into a private variable.
* @breaking-change 14.0.0
*/
const CDK_DESCRIBEDBY_HOST_ATTRIBUTE = 'cdk-describedby-host';
/** Global incremental identifier for each registered message element. */
let nextId = 0;
/**
* Utility that creates visually hidden elements with a message content. Useful for elements that
* want to use aria-describedby to further describe themselves without adding additional visual
* content.
*/
class AriaDescriber {
constructor(_document,
/**
* @deprecated To be turned into a required parameter.
* @breaking-change 14.0.0
*/
_platform) {
this._platform = _platform;
/** Map of all registered message elements that have been placed into the document. */
this._messageRegistry = new Map();
/** Container for all registered messages. */
this._messagesContainer = null;
/** Unique ID for the service. */
this._id = `${nextId++}`;
this._document = _document;
this._id = inject(APP_ID) + '-' + nextId++;
}
describe(hostElement, message, role) {
if (!this._canBeDescribed(hostElement, message)) {
return;
}
const key = getKey(message, role);
if (typeof message !== 'string') {
// We need to ensure that the element has an ID.
setMessageId(message, this._id);
this._messageRegistry.set(key, { messageElement: message, referenceCount: 0 });
}
else if (!this._messageRegistry.has(key)) {
this._createMessageElement(message, role);
}
if (!this._isElementDescribedByMessage(hostElement, key)) {
this._addMessageReference(hostElement, key);
}
}
removeDescription(hostElement, message, role) {
if (!message || !this._isElementNode(hostElement)) {
return;
}
const key = getKey(message, role);
if (this._isElementDescribedByMessage(hostElement, key)) {
this._removeMessageReference(hostElement, key);
}
// If the message is a string, it means that it's one that we created for the
// consumer so we can remove it safely, otherwise we should leave it in place.
if (typeof message === 'string') {
const registeredMessage = this._messageRegistry.get(key);
if (registeredMessage && registeredMessage.referenceCount === 0) {
this._deleteMessageElement(key);
}
}
if (this._messagesContainer?.childNodes.length === 0) {
this._messagesContainer.remove();
this._messagesContainer = null;
}
}
/** Unregisters all created message elements and removes the message container. */
ngOnDestroy() {
const describedElements = this._document.querySelectorAll(`[${CDK_DESCRIBEDBY_HOST_ATTRIBUTE}="${this._id}"]`);
for (let i = 0; i < describedElements.length; i++) {
this._removeCdkDescribedByReferenceIds(describedElements[i]);
describedElements[i].removeAttribute(CDK_DESCRIBEDBY_HOST_ATTRIBUTE);
}
this._messagesContainer?.remove();
this._messagesContainer = null;
this._messageRegistry.clear();
}
/**
* Creates a new element in the visually hidden message container element with the message
* as its content and adds it to the message registry.
*/
_createMessageElement(message, role) {
const messageElement = this._document.createElement('div');
setMessageId(messageElement, this._id);
messageElement.textContent = message;
if (role) {
messageElement.setAttribute('role', role);
}
this._createMessagesContainer();
this._messagesContainer.appendChild(messageElement);
this._messageRegistry.set(getKey(message, role), { messageElement, referenceCount: 0 });
}
/** Deletes the message element from the global messages container. */
_deleteMessageElement(key) {
this._messageRegistry.get(key)?.messageElement?.remove();
this._messageRegistry.delete(key);
}
/** Creates the global container for all aria-describedby messages. */
_createMessagesContainer() {
if (this._messagesContainer) {
return;
}
const containerClassName = 'cdk-describedby-message-container';
const serverContainers = this._document.querySelectorAll(`.${containerClassName}[platform="server"]`);
for (let i = 0; i < serverContainers.length; i++) {
// When going from the server to the client, we may end up in a situation where there's
// already a container on the page, but we don't have a reference to it. Clear the
// old container so we don't get duplicates. Doing this, instead of emptying the previous
// container, should be slightly faster.
serverContainers[i].remove();
}
const messagesContainer = this._document.createElement('div');
// We add `visibility: hidden` in order to prevent text in this container from
// being searchable by the browser's Ctrl + F functionality.
// Screen-readers will still read the description for elements with aria-describedby even
// when the description element is not visible.
messagesContainer.style.visibility = 'hidden';
// Even though we use `visibility: hidden`, we still apply `cdk-visually-hidden` so that
// the description element doesn't impact page layout.
messagesContainer.classList.add(containerClassName);
messagesContainer.classList.add('cdk-visually-hidden');
// @breaking-change 14.0.0 Remove null check for `_platform`.
if (this._platform && !this._platform.isBrowser) {
messagesContainer.setAttribute('platform', 'server');
}
this._document.body.appendChild(messagesContainer);
this._messagesContainer = messagesContainer;
}
/** Removes all cdk-describedby messages that are hosted through the element. */
_removeCdkDescribedByReferenceIds(element) {
// Remove all aria-describedby reference IDs that are prefixed by CDK_DESCRIBEDBY_ID_PREFIX
const originalReferenceIds = getAriaReferenceIds(element, 'aria-describedby').filter(id => id.indexOf(CDK_DESCRIBEDBY_ID_PREFIX) != 0);
element.setAttribute('aria-describedby', originalReferenceIds.join(' '));
}
/**
* Adds a message reference to the element using aria-describedby and increments the registered
* message's reference count.
*/
_addMessageReference(element, key) {
const registeredMessage = this._messageRegistry.get(key);
// Add the aria-describedby reference and set the
// describedby_host attribute to mark the element.
addAriaReferencedId(element, 'aria-describedby', registeredMessage.messageElement.id);
element.setAttribute(CDK_DESCRIBEDBY_HOST_ATTRIBUTE, this._id);
registeredMessage.referenceCount++;
}
/**
* Removes a message reference from the element using aria-describedby
* and decrements the registered message's reference count.
*/
_removeMessageReference(element, key) {
const registeredMessage = this._messageRegistry.get(key);
registeredMessage.referenceCount--;
removeAriaReferencedId(element, 'aria-describedby', registeredMessage.messageElement.id);
element.removeAttribute(CDK_DESCRIBEDBY_HOST_ATTRIBUTE);
}
/** Returns true if the element has been described by the provided message ID. */
_isElementDescribedByMessage(element, key) {
const referenceIds = getAriaReferenceIds(element, 'aria-describedby');
const registeredMessage = this._messageRegistry.get(key);
const messageId = registeredMessage && registeredMessage.messageElement.id;
return !!messageId && referenceIds.indexOf(messageId) != -1;
}
/** Determines whether a message can be described on a particular element. */
_canBeDescribed(element, message) {
if (!this._isElementNode(element)) {
return false;
}
if (message && typeof message === 'object') {
// We'd have to make some assumptions about the description element's text, if the consumer
// passed in an element. Assume that if an element is passed in, the consumer has verified
// that it can be used as a description.
return true;
}
const trimmedMessage = message == null ? '' : `${message}`.trim();
const ariaLabel = element.getAttribute('aria-label');
// We shouldn't set descriptions if they're exactly the same as the `aria-label` of the
// element, because screen readers will end up reading out the same text twice in a row.
return trimmedMessage ? !ariaLabel || ariaLabel.trim() !== trimmedMessage : false;
}
/** Checks whether a node is an Element node. */
_isElementNode(element) {
return element.nodeType === this._document.ELEMENT_NODE;
}
static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: AriaDescriber, deps: [{ token: DOCUMENT }, { token: i1.Platform }], target: i0.ɵɵFactoryTarget.Injectable }); }
static { this.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: AriaDescriber, providedIn: 'root' }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: AriaDescriber, decorators: [{
type: Injectable,
args: [{ providedIn: 'root' }]
}], ctorParameters: function () { return [{ type: undefined, decorators: [{
type: Inject,
args: [DOCUMENT]
}] }, { type: i1.Platform }]; } });
/** Gets a key that can be used to look messages up in the registry. */
function getKey(message, role) {
return typeof message === 'string' ? `${role || ''}/${message}` : message;
}
/** Assigns a unique ID to an element, if it doesn't have one already. */
function setMessageId(element, serviceId) {
if (!element.id) {
element.id = `${CDK_DESCRIBEDBY_ID_PREFIX}-${serviceId}-${nextId++}`;
}
}
/**
* This class manages keyboard events for selectable lists. If you pass it a query list
* of items, it will set the active item correctly when arrow events occur.
*/
class ListKeyManager {
constructor(_items) {
this._items = _items;
this._activeItemIndex = -1;
this._activeItem = null;
this._wrap = false;
this._letterKeyStream = new Subject();
this._typeaheadSubscription = Subscription.EMPTY;
this._vertical = true;
this._allowedModifierKeys = [];
this._homeAndEnd = false;
this._pageUpAndDown = { enabled: false, delta: 10 };
/**
* Predicate function that can be used to check whether an item should be skipped
* by the key manager. By default, disabled items are skipped.
*/
this._skipPredicateFn = (item) => item.disabled;
// Buffer for the letters that the user has pressed when the typeahead option is turned on.
this._pressedLetters = [];
/**
* Stream that emits any time the TAB key is pressed, so components can react
* when focus is shifted off of the list.
*/
this.tabOut = new Subject();
/** Stream that emits whenever the active item of the list manager changes. */
this.change = new Subject();
// We allow for the items to be an array because, in some cases, the consumer may
// not have access to a QueryList of the items they want to manage (e.g. when the
// items aren't being collected via `ViewChildren` or `ContentChildren`).
if (_items instanceof QueryList) {
this._itemChangesSubscription = _items.changes.subscribe((newItems) => {
if (this._activeItem) {
const itemArray = newItems.toArray();
const newIndex = itemArray.indexOf(this._activeItem);
if (newIndex > -1 && newIndex !== this._activeItemIndex) {
this._activeItemIndex = newIndex;
}
}
});
}
}
/**
* Sets the predicate function that determines which items should be skipped by the
* list key manager.
* @param predicate Function that determines whether the given item should be skipped.
*/
skipPredicate(predicate) {
this._skipPredicateFn = predicate;
return this;
}
/**
* Configures wrapping mode, which determines whether the active item will wrap to
* the other end of list when there are no more items in the given direction.
* @param shouldWrap Whether the list should wrap when reaching the end.
*/
withWrap(shouldWrap = true) {
this._wrap = shouldWrap;
return this;
}
/**
* Configures whether the key manager should be able to move the selection vertically.
* @param enabled Whether vertical selection should be enabled.
*/
withVerticalOrientation(enabled = true) {
this._vertical = enabled;
return this;
}
/**
* Configures the key manager to move the selection horizontally.
* Passing in `null` will disable horizontal movement.
* @param direction Direction in which the selection can be moved.
*/
withHorizontalOrientation(direction) {
this._horizontal = direction;
return this;
}
/**
* Modifier keys which are allowed to be held down and whose default actions will be prevented
* as the user is pressing the arrow keys. Defaults to not allowing any modifier keys.
*/
withAllowedModifierKeys(keys) {
this._allowedModifierKeys = keys;
return this;
}
/**
* Turns on typeahead mode which allows users to set the active item by typing.
* @param debounceInterval Time to wait after the last keystroke before setting the active item.
*/
withTypeAhead(debounceInterval = 200) {
if ((typeof ngDevMode === 'undefined' || ngDevMode) &&
this._items.length &&
this._items.some(item => typeof item.getLabel !== 'function')) {
throw Error('ListKeyManager items in typeahead mode must implement the `getLabel` method.');
}
this._typeaheadSubscription.unsubscribe();
// Debounce the presses of non-navigational keys, collect the ones that correspond to letters
// and convert those letters back into a string. Afterwards find the first item that starts
// with that string and select it.
this._typeaheadSubscription = this._letterKeyStream
.pipe(tap(letter => this._pressedLetters.push(letter)), debounceTime(debounceInterval), filter(() => this._pressedLetters.length > 0), map(() => this._pressedLetters.join('')))
.subscribe(inputString => {
const items = this._getItemsArray();
// Start at 1 because we want to start searching at the item immediately
// following the current active item.
for (let i = 1; i < items.length + 1; i++) {
const index = (this._activeItemIndex + i) % items.length;
const item = items[index];
if (!this._skipPredicateFn(item) &&
item.getLabel().toUpperCase().trim().indexOf(inputString) === 0) {
this.setActiveItem(index);
break;
}
}
this._pressedLetters = [];
});
return this;
}
/** Cancels the current typeahead sequence. */
cancelTypeahead() {
this._pressedLetters = [];
return this;
}
/**
* Configures the key manager to activate the first and last items
* respectively when the Home or End key is pressed.
* @param enabled Whether pressing the Home or End key activates the first/last item.
*/
withHomeAndEnd(enabled = true) {
this._homeAndEnd = enabled;
return this;
}
/**
* Configures the key manager to activate every 10th, configured or first/last element in up/down direction
* respectively when the Page-Up or Page-Down key is pressed.
* @param enabled Whether pressing the Page-Up or Page-Down key activates the first/last item.
* @param delta Whether pressing the Home or End key activates the first/last item.
*/
withPageUpDown(enabled = true, delta = 10) {
this._pageUpAndDown = { enabled, delta };
return this;
}
setActiveItem(item) {
const previousActiveItem = this._activeItem;
this.updateActiveItem(item);
if (this._activeItem !== previousActiveItem) {
this.change.next(this._activeItemIndex);
}
}
/**
* Sets the active item depending on the key event passed in.
* @param event Keyboard event to be used for determining which element should be active.
*/
onKeydown(event) {
const keyCode = event.keyCode;
const modifiers = ['altKey', 'ctrlKey', 'metaKey', 'shiftKey'];
const isModifierAllowed = modifiers.every(modifier => {
return !event[modifier] || this._allowedModifierKeys.indexOf(modifier) > -1;
});
switch (keyCode) {
case TAB:
this.tabOut.next();
return;
case DOWN_ARROW:
if (this._vertical && isModifierAllowed) {
this.setNextItemActive();
break;
}
else {
return;
}
case UP_ARROW:
if (this._vertical && isModifierAllowed) {
this.setPreviousItemActive();
break;
}
else {
return;
}
case RIGHT_ARROW:
if (this._horizontal && isModifierAllowed) {
this._horizontal === 'rtl' ? this.setPreviousItemActive() : this.setNextItemActive();
break;
}
else {
return;
}
case LEFT_ARROW:
if (this._horizontal && isModifierAllowed) {
this._horizontal === 'rtl' ? this.setNextItemActive() : this.setPreviousItemActive();
break;
}
else {
return;
}
case HOME:
if (this._homeAndEnd && isModifierAllowed) {
this.setFirstItemActive();
break;
}
else {
return;
}
case END:
if (this._homeAndEnd && isModifierAllowed) {
this.setLastItemActive();
break;
}
else {
return;
}
case PAGE_UP:
if (this._pageUpAndDown.enabled && isModifierAllowed) {
const targetIndex = this._activeItemIndex - this._pageUpAndDown.delta;
this._setActiveItemByIndex(targetIndex > 0 ? targetIndex : 0, 1);
break;
}
else {
return;
}
case PAGE_DOWN:
if (this._pageUpAndDown.enabled && isModifierAllowed) {
const targetIndex = this._activeItemIndex + this._pageUpAndDown.delta;
const itemsLength = this._getItemsArray().length;
this._setActiveItemByIndex(targetIndex < itemsLength ? targetIndex : itemsLength - 1, -1);
break;
}
else {
return;
}
default:
if (isModifierAllowed || hasModifierKey(event, 'shiftKey')) {
// Attempt to use the `event.key` which also maps it to the user's keyboard language,
// otherwise fall back to resolving alphanumeric characters via the keyCode.
if (event.key && event.key.length === 1) {
this._letterKeyStream.next(event.key.toLocaleUpperCase());
}
else if ((keyCode >= A && keyCode <= Z) || (keyCode >= ZERO && keyCode <= NINE)) {
this._letterKeyStream.next(String.fromCharCode(keyCode));
}
}
// Note that we return here, in order to avoid preventing
// the default action of non-navigational keys.
return;
}
this._pressedLetters = [];
event.preventDefault();
}
/** Index of the currently active item. */
get activeItemIndex() {
return this._activeItemIndex;
}
/** The active item. */
get activeItem() {
return this._activeItem;
}
/** Gets whether the user is currently typing into the manager using the typeahead feature. */
isTyping() {
return this._pressedLetters.length > 0;
}
/** Sets the active item to the first enabled item in the list. */
setFirstItemActive() {
this._setActiveItemByIndex(0, 1);
}
/** Sets the active item to the last enabled item in the list. */
setLastItemActive() {
this._setActiveItemByIndex(this._items.length - 1, -1);
}
/** Sets the active item to the next enabled item in the list. */
setNextItemActive() {
this._activeItemIndex < 0 ? this.setFirstItemActive() : this._setActiveItemByDelta(1);
}
/** Sets the active item to a previous enabled item in the list. */
setPreviousItemActive() {
this._activeItemIndex < 0 && this._wrap
? this.setLastItemActive()
: this._setActiveItemByDelta(-1);
}
updateActiveItem(item) {
const itemArray = this._getItemsArray();
const index = typeof item === 'number' ? item : itemArray.indexOf(item);
const activeItem = itemArray[index];
// Explicitly check for `null` and `undefined` because other falsy values are valid.
this._activeItem = activeItem == null ? null : activeItem;
this._activeItemIndex = index;
}
/** Cleans up the key manager. */
destroy() {
this._typeaheadSubscription.unsubscribe();
this._itemChangesSubscription?.unsubscribe();
this._letterKeyStream.complete();
this.tabOut.complete();
this.change.complete();
this._pressedLetters = [];
}
/**
* This method sets the active item, given a list of items and the delta between the
* currently active item and the new active item. It will calculate differently
* depending on whether wrap mode is turned on.
*/
_setActiveItemByDelta(delta) {
this._wrap ? this._setActiveInWrapMode(delta) : this._setActiveInDefaultMode(delta);
}
/**
* Sets the active item properly given "wrap" mode. In other words, it will continue to move
* down the list until it finds an item that is not disabled, and it will wrap if it
* encounters either end of the list.
*/
_setActiveInWrapMode(delta) {
const items = this._getItemsArray();
for (let i = 1; i <= items.length; i++) {
const index = (this._activeItemIndex + delta * i + items.length) % items.length;
const item = items[index];
if (!this._skipPredicateFn(item)) {
this.setActiveItem(index);
return;
}
}
}
/**
* Sets the active item properly given the default mode. In other words, it will
* continue to move down the list until it finds an item that is not disabled. If
* it encounters either end of the list, it will stop and not wrap.
*/
_setActiveInDefaultMode(delta) {
this._setActiveItemByIndex(this._activeItemIndex + delta, delta);
}
/**
* Sets the active item to the first enabled item starting at the index specified. If the
* item is disabled, it will move in the fallbackDelta direction until it either
* finds an enabled item or encounters the end of the list.
*/
_setActiveItemByIndex(index, fallbackDelta) {
const items = this._getItemsArray();
if (!items[index]) {
return;
}
while (this._skipPredicateFn(items[index])) {
index += fallbackDelta;
if (!items[index]) {
return;
}
}
this.setActiveItem(index);
}
/** Returns the items as an array. */
_getItemsArray() {
return this._items instanceof QueryList ? this._items.toArray() : this._items;
}
}
class ActiveDescendantKeyManager extends ListKeyManager {
setActiveItem(index) {
if (this.activeItem) {
this.activeItem.setInactiveStyles();
}
super.setActiveItem(index);
if (this.activeItem) {
this.activeItem.setActiveStyles();
}
}
}
class FocusKeyManager extends ListKeyManager {
constructor() {
super(...arguments);
this._origin = 'program';
}
/**
* Sets the focus origin that will be passed in to the items for any subsequent `focus` calls.
* @param origin Focus origin to be used when focusing items.
*/
setFocusOrigin(origin) {
this._origin = origin;
return this;
}
setActiveItem(item) {
super.setActiveItem(item);
if (this.activeItem) {
this.activeItem.focus(this._origin);
}
}
}
/**
* Configuration for the isFocusable method.
*/
class IsFocusableConfig {
constructor() {
/**
* Whether to count an element as focusable even if it is not currently visible.
*/
this.ignoreVisibility = false;
}
}
// The InteractivityChecker leans heavily on the ally.js accessibility utilities.
// Methods like `isTabbable` are only covering specific edge-cases for the browsers which are
// supported.
/**
* Utility for checking the interactivity of an element, such as whether it is focusable or
* tabbable.
*/
class InteractivityChecker {
constructor(_platform) {
this._platform = _platform;
}
/**
* Gets whether an element is disabled.
*
* @param element Element to be checked.
* @returns Whether the element is disabled.
*/
isDisabled(element) {
// This does not capture some cases, such as a non-form control with a disabled attribute or
// a form control inside of a disabled form, but should capture the most common cases.
return element.hasAttribute('disabled');
}
/**
* Gets whether an element is visible for the purposes of interactivity.
*
* This will capture states like `display: none` and `visibility: hidden`, but not things like
* being clipped by an `overflow: hidden` parent or being outside the viewport.
*
* @returns Whether the element is visible.
*/
isVisible(element) {
return hasGeometry(element) && getComputedStyle(element).visibility === 'visible';
}
/**
* Gets whether an element can be reached via Tab key.
* Assumes that the element has already been checked with isFocusable.
*
* @param element Element to be checked.
* @returns Whether the element is tabbable.
*/
isTabbable(element) {
// Nothing is tabbable on the server 😎
if (!this._platform.isBrowser) {
return false;
}
const frameElement = getFrameElement(getWindow(element));
if (frameElement) {
// Frame elements inherit their tabindex onto all child elements.
if (getTabIndexValue(frameElement) === -1) {
return false;
}
// Browsers disable tabbing to an element inside of an invisible frame.
if (!this.isVisible(frameElement)) {
return false;
}
}
let nodeName = element.nodeName.toLowerCase();
let tabIndexValue = getTabIndexValue(element);
if (element.hasAttribute('contenteditable')) {
return tabIndexValue !== -1;
}
if (nodeName === 'iframe' || nodeName === 'object') {
// The frame or object's content may be tabbable depending on the content, but it's
// not possibly to reliably detect the content of the frames. We always consider such
// elements as non-tabbable.
return false;
}
// In iOS, the browser only considers some specific elements as tabbable.
if (this._platform.WEBKIT && this._platform.IOS && !isPotentiallyTabbableIOS(element)) {
return false;
}
if (nodeName === 'audio') {
// Audio elements without controls enabled are never tabbable, regardless
// of the tabindex attribute explicitly being set.
if (!element.hasAttribute('controls')) {
return false;
}
// Audio elements with controls are by default tabbable unless the
// tabindex attribute is set to `-1` explicitly.
return tabIndexValue !== -1;
}
if (nodeName === 'video') {
// For all video elements, if the tabindex attribute is set to `-1`, the video
// is not tabbable. Note: We cannot rely on the default `HTMLElement.tabIndex`
// property as that one is set to `-1` in Chrome, Edge and Safari v13.1. The
// tabindex attribute is the source of truth here.
if (tabIndexValue === -1) {
return false;
}
// If the tabindex is explicitly set, and not `-1` (as per check before), the
// video element is always tabbable (regardless of whether it has controls or not).
if (tabIndexValue !== null) {
return true;
}
// Otherwise (when no explicit tabindex is set), a video is only tabbable if it
// has controls enabled. Firefox is special as videos are always tabbable regardless
// of whether there are controls or not.
return this._platform.FIREFOX || element.hasAttribute('controls');
}
return element.tabIndex >= 0;
}
/**
* Gets whether an element can be focused by the user.
*
* @param element Element to be checked.
* @param config The config object with options to customize this method's behavior
* @returns Whether the element is focusable.
*/
isFocusable(element, config) {
// Perform checks in order of left to most expensive.
// Again, naive approach that does not capture many edge cases and browser quirks.
return (isPotentiallyFocusable(element) &&
!this.isDisabled(element) &&
(config?.ignoreVisibility || this.isVisible(element)));
}
static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: InteractivityChecker, deps: [{ token: i1.Platform }], target: i0.ɵɵFactoryTarget.Injectable }); }
static { this.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: InteractivityChecker, providedIn: 'root' }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: InteractivityChecker, decorators: [{
type: Injectable,
args: [{ providedIn: 'root' }]
}], ctorParameters: function () { return [{ type: i1.Platform }]; } });
/**
* Returns the frame element from a window object. Since browsers like MS Edge throw errors if
* the frameElement property is being accessed from a different host address, this property
* should be accessed carefully.
*/
function getFrameElement(window) {
try {
return window.frameElement;
}
catch {
return null;
}
}
/** Checks whether the specified element has any geometry / rectangles. */
function hasGeometry(element) {
// Use logic from jQuery to check for an invisible element.
// See https://github.com/jquery/jquery/blob/master/src/css/hiddenVisibleSelectors.js#L12
return !!(element.offsetWidth ||
element.offsetHeight ||
(typeof element.getClientRects === 'function' && element.getClientRects().length));
}
/** Gets whether an element's */
function isNativeFormElement(element) {
let nodeName = element.nodeName.toLowerCase();
return (nodeName === 'input' ||
nodeName === 'select' ||
nodeName === 'button' ||
nodeName === 'textarea');
}
/** Gets whether an element is an `<input type="hidden">`. */
function isHiddenInput(element) {
return isInputElement(element) && element.type == 'hidden';
}
/** Gets whether an element is an anchor that has an href attribute. */
function isAnchorWithHref(element) {
return isAnchorElement(element) && element.hasAttribute('href');
}
/** Gets whether an element is an input element. */
function isInputElement(element) {
return element.nodeName.toLowerCase() == 'input';
}
/** Gets whether an element is an anchor element. */
function isAnchorElement(element) {
return element.nodeName.toLowerCase() == 'a';
}
/** Gets whether an element has a valid tabindex. */
function hasValidTabIndex(element) {
if (!element.hasAttribute('tabindex') || element.tabIndex === undefined) {
return false;
}
let tabIndex = element.getAttribute('tabindex');
return !!(tabIndex && !isNaN(parseInt(tabIndex, 10)));
}
/**
* Returns the parsed tabindex from the element attributes instead of returning the
* evaluated tabindex from the browsers defaults.
*/
function getTabIndexValue(element) {
if (!hasValidTabIndex(element)) {
return null;
}
// See browser issue in Gecko https://bugzilla.mozilla.org/show_bug.cgi?id=1128054
const tabIndex = parseInt(element.getAttribute('tabindex') || '', 10);
return isNaN(tabIndex) ? -1 : tabIndex;
}
/** Checks whether the specified element is potentially tabbable on iOS */
function isPotentiallyTabbableIOS(element) {
let nodeName = element.nodeName.toLowerCase();
let inputType = nodeName === 'input' && element.type;
return (inputType === 'text' ||
inputType === 'password' ||
nodeName === 'select' ||
nodeName === 'textarea');
}
/**
* Gets whether an element is potentially focusable without taking current visible/disabled state
* into account.
*/
function isPotentiallyFocusable(element) {
// Inputs are potentially focusable *unless* they're type="hidden".
if (isHiddenInput(element)) {
return false;
}
return (isNativeFormElement(element) ||
isAnchorWithHref(element) ||
element.hasAttribute('contenteditable') ||
hasValidTabIndex(element));
}
/** Gets the parent window of a DOM node with regards of being inside of an iframe. */
function getWindow(node) {
// ownerDocument is null if `node` itself *is* a document.
return (node.ownerDocument && node.ownerDocument.defaultView) || window;
}
/**
* Class that allows for trapping focus within a DOM element.
*
* This class currently uses a relatively simple approach to focus trapping.
* It assumes that the tab order is the same as DOM order, which is not necessarily true.
* Things like `tabIndex > 0`, flex `order`, and shadow roots can cause the two to be misaligned.
*
* @deprecated Use `ConfigurableFocusTrap` instead.
* @breaking-change 11.0.0
*/
class FocusTrap {
/** Whether the focus trap is active. */
get enabled() {
return this._enabled;
}
set enabled(value) {
this._enabled = value;
if (this._startAnchor && this._endAnchor) {
this._toggleAnchorTabIndex(value, this._startAnchor);
this._toggleAnchorTabIndex(value, this._endAnchor);
}
}
constructor(_element, _checker, _ngZone, _document, deferAnchors = false) {
this._element = _element;
this._checker = _checker;
this._ngZone = _ngZone;
this._document = _document;
this._hasAttached = false;
// Event listeners for the anchors. Need to be regular functions so that we can unbind them later.
this.startAnchorListener = () => this.focusLastTabbableElement();
this.endAnchorListener = () => this.focusFirstTabbableElement();
this._enabled = true;
if (!deferAnchors) {
this.attachAnchors();
}
}
/** Destroys the focus trap by cleaning up the anchors. */
destroy() {
const startAnchor = this._startAnchor;
const endAnchor = this._endAnchor;
if (startAnchor) {
startAnchor.removeEventListener('focus', this.startAnchorListener);
startAnchor.remove();
}
if (endAnchor) {
endAnchor.removeEventListener('focus', this.endAnchorListener);
endAnchor.remove();
}
this._startAnchor = this._endAnchor = null;
this._hasAttached = false;
}
/**
* Inserts the anchors into the DOM. This is usually done automatically
* in the constructor, but can be deferred for cases like directives with `*ngIf`.
* @returns Whether the focus trap managed to attach successfully. This may not be the case
* if the target element isn't currently in the DOM.
*/
attachAnchors() {
// If we're not on the browser, there can be no focus to trap.
if (this._hasAttached) {
return true;
}
this._ngZone.runOutsideAngular(() => {
if (!this._startAnchor) {
this._startAnchor = this._createAnchor();
this._startAnchor.addEventListener('focus', this.startAnchorListener);
}
if (!this._endAnchor) {
this._endAnchor = this._createAnchor();
this._endAnchor.addEventListener('focus', this.endAnchorListener);
}
});
if (this._element.parentNode) {
this._element.parentNode.insertBefore(this._startAnchor, this._element);
this._element.parentNode.insertBefore(this._endAnchor, this._element.nextSibling);
this._hasAttached = true;
}
return this._hasAttached;
}
/**
* Waits for the zone to stabilize, then focuses the first tabbable element.
* @returns Returns a promise that resolves with a boolean, depending
* on whether focus was moved successfully.
*/
focusInitialElementWhenReady(options) {
return new Promise(resolve => {
this._executeOnStable(() => resolve(this.focusInitialElement(options)));
});
}
/**
* Waits for the zone to stabilize, then focuses
* the first tabbable element within the focus trap region.
* @returns Returns a promise that resolves with a boolean, depending
* on whether focus was moved successfully.
*/
focusFirstTabbableElementWhenReady(options) {
return new Promise(resolve => {
this._executeOnStable(() => resolve(this.focusFirstTabbableElement(options)));
});
}
/**
* Waits for the zone to stabilize, then focuses
* the last tabbable element within the focus trap region.
* @returns Returns a promise that resolves with a boolean, depending
* on whether focus was moved successfully.
*/
focusLastTabbableElementWhenReady(options) {
return new Promise(resolve => {
this._executeOnStable(() => resolve(this.focusLastTabbableElement(options)));
});
}
/**
* Get the specified boundary element of the trapped region.
* @param bound The boundary to get (start or end of trapped region).
* @returns The boundary element.
*/
_getRegionBoundary(bound) {
// Contains the deprecated version of selector, for temporary backwards comparability.
const markers = this._element.querySelectorAll(`[cdk-focus-region-${bound}], ` + `[cdkFocusRegion${bound}], ` + `[cdk-focus-${bound}]`);
if (typeof ngDevMode === 'undefined' || ngDevMode) {
for (let i = 0; i < markers.length; i++) {
// @breaking-change 8.0.0
if (markers[i].hasAttribute(`cdk-focus-${bound}`)) {
console.warn(`Found use of deprecated attribute 'cdk-focus-${bound}', ` +
`use 'cdkFocusRegion${bound}' instead. The deprecated ` +
`attribute will be removed in 8.0.0.`, markers[i]);
}
else if (markers[i].hasAttribute(`cdk-focus-region-${bound}`)) {
console.warn(`Found use of deprecated attribute 'cdk-focus-region-${bound}', ` +
`use 'cdkFocusRegion${bound}' instead. The deprecated attribute ` +
`will be removed in 8.0.0.`, markers[i]);
}
}
}
if (bound == 'start') {
return markers.length ? markers[0] : this._getFirstTabbableElement(this._element);
}
return markers.length
? markers[markers.length - 1]
: this._getLastTabbableElement(this._element);
}
/**
* Focuses the element that should be focused when the focus trap is initialized.
* @returns Whether focus was moved successfully.
*/
focusInitialElement(options) {
// Contains the deprecated version of selector, for temporary backwards comparability.
const redirectToElement = this._element.querySelector(`[cdk-focus-initial], ` + `[cdkFocusInitial]`);
if (redirectToElement) {
// @breaking-change 8.0.0
if ((typeof ngDevMode === 'undefined' || ngDevMode) &&
redirectToElement.hasAttribute(`cdk-focus-initial`)) {
console.warn(`Found use of deprecated attribute 'cdk-focus-initial', ` +
`use 'cdkFocusInitial' instead. The deprecated attribute ` +
`will be removed in 8.0.0`, redirectToElement);
}
// Warn the consumer if the element they've pointed to
// isn't focusable, when not in production mode.
if ((typeof ngDevMode === 'undefined' || ngDevMode) &&
!this._checker.isFocusable(redirectToElement)) {
console.warn(`Element matching '[cdkFocusInitial]' is not focusable.`, redirectToElement);
}
if (!this._checker.isFocusable(redirectToElement)) {
const focusableChild = this._getFirstTabbableElement(redirectToElement);
focusableChild?.focus(options);
return !!focusableChild;
}
redirectToElement.focus(options);
return true;
}
return this.focusFirstTabbableElement(options);
}
/**
* Focuses the first tabbable element within the focus trap region.
* @returns Whether focus was moved successfully.
*/
focusFirstTabbableElement(options) {
const redirectToElement = this._getRegionBoundary('start');
if (redirectToElement) {
redirectToElement.focus(options);
}
return !!redirectToElement;
}
/**
* Focuses the last tabbable element within the focus trap region.
* @returns Whether focus was moved successfully.
*/
focusLastTabbableElement(options) {
const redirectToElement = this._getRegionBoundary('end');
if (redirectToElement) {
redirectToElement.focus(options);
}
return !!redirectToElement;
}
/**
* Checks whether the focus trap has successfully been attached.
*/
hasAttached() {
return this._hasAttached;
}
/** Get the first tabbable element from a DOM subtree (inclusive). */
_getFirstTabbableElement(root) {
if (this._checker.isFocusable(root) && this._checker.isTabbable(root)) {
return root;
}
const children = root.children;
for (let i = 0; i < children.length; i++) {
const tabbableChild = children[i].nodeType === this._document.ELEMENT_NODE
? this._getFirstTabbableElement(children[i])
: null;
if (tabbableChild) {
return tabbableChild;
}
}
return null;
}
/** Get the last tabbable element from a DOM subtree (inclusive). */
_getLastTabbableElement(root) {
if (this._checker.isFocusable(root) && this._checker.isTabbable(root)) {
return root;
}
// Iterate in reverse DOM order.
const children = root.children;
for (let i = children.length - 1; i >= 0; i--) {
const tabbableChild = children[i].nodeType === this._document.ELEMENT_NODE
? this._getLastTabbableElement(children[i])
: null;
if (tabbableChild) {
return tabbableChild;
}
}
return null;
}
/** Creates an anchor element. */
_createAnchor() {
const anchor = this._document.createElement('div');
this._toggleAnchorTabIndex(this._enabled, anchor);
anchor.classList.add('cdk-visually-hidden');
anchor.classList.add('cdk-focus-trap-anchor');
anchor.setAttribute('aria-hidden', 'true');
return anchor;
}
/**
* Toggles the `tabindex` of an anchor, based on the enabled state of the focus trap.
* @param isEnabled Whether the focus trap is enabled.
* @param anchor Anchor on which to toggle the tabindex.
*/
_toggleAnchorTabIndex(isEnabled, anchor) {
// Remove the tabindex completely, rather than setting it to -1, because if the
// element has a tabindex, the user might still hit it when navigating with the arrow keys.
isEnabled ? anchor.setAttribute('tabindex', '0') : anchor.removeAttribute('tabindex');
}
/**
* Toggles the`tabindex` of both anchors to either trap Tab focus or allow it to escape.
* @param enabled: Whether the anchors should trap Tab.
*/
toggleAnchors(enabled) {
if (this._startAnchor && this._endAnchor) {
this._toggleAnchorTabIndex(enabled, this._startAnchor);
this._toggleAnchorTabIndex(enabled, this._endAnchor);
}
}
/** Executes a function when the zone is stable. */
_executeOnStable(fn) {
if (this._ngZone.isStable) {
fn();
}
else {
this._ngZone.onStable.pipe(take(1)).subscribe(fn);
}
}
}
/**
* Factory that allows easy instantiation of focus traps.
* @deprecated Use `ConfigurableFocusTrapFactory` instead.
* @breaking-change 11.0.0
*/
class FocusTrapFactory {
constructor(_checker, _ngZone, _document) {
this._checker = _checker;
this._ngZone = _ngZone;
this._document = _document;
}
/**
* Creates a focus-trapped region around the given element.
* @param element The element around which focus will be trapped.
* @param deferCaptureElements Defers the creation of focus-capturing elements to be done
* manually by the user.
* @returns The created focus trap instance.
*/
create(element, deferCaptureElements = false) {
return new FocusTrap(element, this._checker, this._ngZone, this._document, deferCaptureElements);
}
static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: FocusTrapFactory, deps: [{ token: InteractivityChecker }, { token: i0.NgZone }, { token: DOCUMENT }], target: i0.ɵɵFactoryTarget.Injectable }); }
static { this.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: FocusTrapFactory, providedIn: 'root' }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: FocusTrapFactory, decorators: [{
type: Injectable,
args: [{ providedIn: 'root' }]
}], ctorParameters: function () { return [{ type: InteractivityChecker }, { type: i0.NgZone }, { type: undefined, decorators: [{
type: Inject,
args: [DOCUMENT]
}] }]; } });
/** Directive for trapping focus within a region. */
class CdkTrapFocus {
/** Whether the focus trap is active. */
get enabled() {
return this.focusTrap.enabled;
}
set enabled(value) {
this.focusTrap.enabled = coerceBooleanProperty(value);
}
/**
* Whether the directive should automatically move focus into the trapped region upon
* initialization and return focus to the previous activeElement upon destruction.
*/
get autoCapture() {
return this._autoCapture;
}
set autoCapture(value) {
this._autoCapture = coerceBooleanProperty(value);
}
constructor(_elementRef, _focusTrapFactory,
/**
* @deprecated No longer being used. To be removed.
* @breaking-change 13.0.0
*/
_document) {
this._elementRef = _elementRef;
this._focusTrapFactory = _focusTrapFactory;
/** Previously focused element to restore focus to upon destroy when using autoCapture. */
this._previouslyFocusedElement = null;
this.focusTrap = this._focusTrapFactory.create(this._elementRef.nativeElement, true);
}
ngOnDestroy() {
this.focusTrap.destroy();
// If we stored a previously focused element when using autoCapture, return focus to that
// element now that the trapped region is being destroyed.
if (this._previouslyFocusedElement) {
this._previouslyFocusedElement.focus();
this._previouslyFocusedElement = null;
}
}
ngAfterContentInit() {
this.focusTrap.attachAnchors();
if (this.autoCapture) {
this._captureFocus();
}
}
ngDoCheck() {
if (!this.focusTrap.hasAttached()) {
this.focusTrap.attachAnchors();
}
}
ngOnChanges(changes) {
const autoCaptureChange = changes['autoCapture'];
if (autoCaptureChange &&
!autoCaptureChange.firstChange &&
this.autoCapture &&
this.focusTrap.hasAttached()) {
this._captureFocus();
}
}
_captureFocus() {
this._previouslyFocusedElement = _getFocusedElementPierceShadowDom();
this.focusTrap.focusInitialElementWhenReady();
}
static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: CdkTrapFocus, deps: [{ token: i0.ElementRef }, { token: FocusTrapFactory }, { token: DOCUMENT }], target: i0.ɵɵFactoryTarget.Directive }); }
static { this.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "14.0.0", version: "16.1.1", type: CdkTrapFocus, selector: "[cdkTrapFocus]", inputs: { enabled: ["cdkTrapFocus", "enabled"], autoCapture: ["cdkTrapFocusAutoCapture", "autoCapture"] }, exportAs: ["cdkTrapFocus"], usesOnChanges: true, ngImport: i0 }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: CdkTrapFocus, decorators: [{
type: Directive,
args: [{
selector: '[cdkTrapFocus]',
exportAs: 'cdkTrapFocus',
}]
}], ctorParameters: function () { return [{ type: i0.ElementRef }, { type: FocusTrapFactory }, { type: undefined, decorators: [{
type: Inject,
args: [DOCUMENT]
}] }]; }, propDecorators: { enabled: [{
type: Input,
args: ['cdkTrapFocus']
}], autoCapture: [{
type: Input,
args: ['cdkTrapFocusAutoCapture']
}] } });
/**
* Class that allows for trapping focus within a DOM element.
*
* This class uses a strategy pattern that determines how it traps focus.
* See FocusTrapInertStrategy.
*/
class ConfigurableFocusTrap extends FocusTrap {
/** Whether the FocusTrap is enabled. */
get enabled() {
return this._enabled;
}
set enabled(value) {
this._enabled = value;
if (this._enabled) {
this._focusTrapManager.register(this);
}
else {
this._focusTrapManager.deregister(this);
}
}
constructor(_element, _checker, _ngZone, _document, _focusTrapManager, _inertStrategy, config) {
super(_element, _checker, _ngZone, _document, config.defer);
this._focusTrapManager = _focusTrapManager;
this._inertStrategy = _inertStrategy;
this._focusTrapManager.register(this);
}
/** Notifies the FocusTrapManager that this FocusTrap will be destroyed. */
destroy() {
this._focusTrapManager.deregister(this);
super.destroy();
}
/** @docs-private Implemented as part of ManagedFocusTrap. */
_enable() {
this._inertStrategy.preventFocus(this);
this.toggleAnchors(true);
}
/** @docs-private Implemented as part of ManagedFocusTrap. */
_disable() {
this._inertStrategy.allowFocus(this);
this.toggleAnchors(false);
}
}
/** The injection token used to specify the inert strategy. */
const FOCUS_TRAP_INERT_STRATEGY = new InjectionToken('FOCUS_TRAP_INERT_STRATEGY');
/**
* Lightweight FocusTrapInertStrategy that adds a document focus event
* listener to redirect focus back inside the FocusTrap.
*/
class EventListenerFocusTrapInertStrategy {
constructor() {
/** Focus event handler. */
this._listener = null;
}
/** Adds a document event listener that keeps focus inside the FocusTrap. */
preventFocus(focusTrap) {
// Ensure there's only one listener per document
if (this._listener) {
focusTrap._document.removeEventListener('focus', this._listener, true);
}
this._listener = (e) => this._trapFocus(focusTrap, e);
focusTrap._ngZone.runOutsideAngular(() => {
focusTrap._document.addEventListener('focus', this._listener, true);
});
}
/** Removes the event listener added in preventFocus. */
allowFocus(focusTrap) {
if (!this._listener) {
return;
}
focusTrap._document.removeEventListener('focus', this._listener, true);
this._listener = null;
}
/**
* Refocuses the first element in the FocusTrap if the focus event target was outside
* the FocusTrap.
*
* This is an event listener callback. The event listener is added in runOutsideAngular,
* so all this code runs outside Angular as well.
*/
_trapFocus(focusTrap, event) {
const target = event.target;
const focusTrapRoot = focusTrap._element;
// Don't refocus if target was in an overlay, because the overlay might be associated
// with an element inside the FocusTrap, ex. mat-select.
if (target && !focusTrapRoot.contains(target) && !target.closest?.('div.cdk-overlay-pane')) {
// Some legacy FocusTrap usages have logic that focuses some element on the page
// just before FocusTrap is destroyed. For backwards compatibility, wait
// to be sure FocusTrap is still enabled before refocusing.
setTimeout(() => {
// Check whether focus wasn't put back into the focus trap while the timeout was pending.
if (focusTrap.enabled && !focusTrapRoot.contains(focusTrap._document.activeElement)) {
focusTrap.focusFirstTabbableElement();
}
});
}
}
}
/** Injectable that ensures only the most recently enabled FocusTrap is active. */
class FocusTrapManager {
constructor() {
// A stack of the FocusTraps on the page. Only the FocusTrap at the
// top of the stack is active.
this._focusTrapStack = [];
}
/**
* Disables the FocusTrap at the top of the stack, and then pushes
* the new FocusTrap onto the stack.
*/
register(focusTrap) {
// Dedupe focusTraps that register multiple times.
this._focusTrapStack = this._focusTrapStack.filter(ft => ft !== focusTrap);
let stack = this._focusTrapStack;
if (stack.length) {
stack[stack.length - 1]._disable();
}
stack.push(focusTrap);
focusTrap._enable();
}
/**
* Removes the FocusTrap from the stack, and activates the
* FocusTrap that is the new top of the stack.
*/
deregister(focusTrap) {
focusTrap._disable();
const stack = this._focusTrapStack;
const i = stack.indexOf(focusTrap);
if (i !== -1) {
stack.splice(i, 1);
if (stack.length) {
stack[stack.length - 1]._enable();
}
}
}
static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: FocusTrapManager, deps: [], target: i0.ɵɵFactoryTarget.Injectable }); }
static { this.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: FocusTrapManager, providedIn: 'root' }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: FocusTrapManager, decorators: [{
type: Injectable,
args: [{ providedIn: 'root' }]
}] });
/** Factory that allows easy instantiation of configurable focus traps. */
class ConfigurableFocusTrapFactory {
constructor(_checker, _ngZone, _focusTrapManager, _document, _inertStrategy) {
this._checker = _checker;
this._ngZone = _ngZone;
this._focusTrapManager = _focusTrapManager;
this._document = _document;
// TODO split up the strategies into different modules, similar to DateAdapter.
this._inertStrategy = _inertStrategy || new EventListenerFocusTrapInertStrategy();
}
create(element, config = { defer: false }) {
let configObject;
if (typeof config === 'boolean') {
configObject = { defer: config };
}
else {
configObject = config;
}
return new ConfigurableFocusTrap(element, this._checker, this._ngZone, this._document, this._focusTrapManager, this._inertStrategy, configObject);
}
static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: ConfigurableFocusTrapFactory, deps: [{ token: InteractivityChecker }, { token: i0.NgZone }, { token: FocusTrapManager }, { token: DOCUMENT }, { token: FOCUS_TRAP_INERT_STRATEGY, optional: true }], target: i0.ɵɵFactoryTarget.Injectable }); }
static { this.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: ConfigurableFocusTrapFactory, providedIn: 'root' }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: ConfigurableFocusTrapFactory, decorators: [{
type: Injectable,
args: [{ providedIn: 'root' }]
}], ctorParameters: function () { return [{ type: InteractivityChecker }, { type: i0.NgZone }, { type: FocusTrapManager }, { type: undefined, decorators: [{
type: Inject,
args: [DOCUMENT]
}] }, { type: undefined, decorators: [{
type: Optional
}, {
type: Inject,
args: [FOCUS_TRAP_INERT_STRATEGY]
}] }]; } });
/** Gets whether an event could be a faked `mousedown` event dispatched by a screen reader. */
function isFakeMousedownFromScreenReader(event) {
// Some screen readers will dispatch a fake `mousedown` event when pressing enter or space on
// a clickable element. We can distinguish these events when `event.buttons` is zero, or
// `event.detail` is zero depending on the browser:
// - `event.buttons` works on Firefox, but fails on Chrome.
// - `detail` works on Chrome, but fails on Firefox.
return event.buttons === 0 || event.detail === 0;
}
/** Gets whether an event could be a faked `touchstart` event dispatched by a screen reader. */
function isFakeTouchstartFromScreenReader(event) {
const touch = (event.touches && event.touches[0]) || (event.changedTouches && event.changedTouches[0]);
// A fake `touchstart` can be distinguished from a real one by looking at the `identifier`
// which is typically >= 0 on a real device versus -1 from a screen reader. Just to be safe,
// we can also look at `radiusX` and `radiusY`. This behavior was observed against a Windows 10
// device with a touch screen running NVDA v2020.4 and Firefox 85 or Chrome 88.
return (!!touch &&
touch.identifier === -1 &&
(touch.radiusX == null || touch.radiusX === 1) &&
(touch.radiusY == null || touch.radiusY === 1));
}
/**
* Injectable options for the InputModalityDetector. These are shallowly merged with the default
* options.
*/
const INPUT_MODALITY_DETECTOR_OPTIONS = new InjectionToken('cdk-input-modality-detector-options');
/**
* Default options for the InputModalityDetector.
*
* Modifier keys are ignored by default (i.e. when pressed won't cause the service to detect
* keyboard input modality) for two reasons:
*
* 1. Modifier keys are commonly used with mouse to perform actions such as 'right click' or 'open
* in new tab', and are thus less representative of actual keyboard interaction.
* 2. VoiceOver triggers some keyboard events when linearly navigating with Control + Option (but
* confusingly not with Caps Lock). Thus, to have parity with other screen readers, we ignore
* these keys so as to not update the input modality.
*
* Note that we do not by default ignore the right Meta key on Safari because it has the same key
* code as the ContextMenu key on other browsers. When we switch to using event.key, we can
* distinguish between the two.
*/
const INPUT_MODALITY_DETECTOR_DEFAULT_OPTIONS = {
ignoreKeys: [ALT, CONTROL, MAC_META, META, SHIFT],
};
/**
* The amount of time needed to pass after a touchstart event in order for a subsequent mousedown
* event to be attributed as mouse and not touch.
*
* This is the value used by AngularJS Material. Through trial and error (on iPhone 6S) they found
* that a value of around 650ms seems appropriate.
*/
const TOUCH_BUFFER_MS = 650;
/**
* Event listener options that enable capturing and also mark the listener as passive if the browser
* supports it.
*/
const modalityEventListenerOptions = normalizePassiveListenerOptions({
passive: true,
capture: true,
});
/**
* Service that detects the user's input modality.
*
* This service does not update the input modality when a user navigates with a screen reader
* (e.g. linear navigation with VoiceOver, object navigation / browse mode with NVDA, virtual PC
* cursor mode with JAWS). This is in part due to technical limitations (i.e. keyboard events do not
* fire as expected in these modes) but is also arguably the correct behavior. Navigating with a
* screen reader is akin to visually scanning a page, and should not be interpreted as actual user
* input interaction.
*
* When a user is not navigating but *interacting* with a screen reader, this service attempts to
* update the input modality to keyboard, but in general this service's behavior is largely
* undefined.
*/
class InputModalityDetector {
/** The most recently detected input modality. */
get mostRecentModality() {
return this._modality.value;
}
constructor(_platform, ngZone, document, options) {
this._platform = _platform;
/**
* The most recently detected input modality event target. Is null if no input modality has been
* detected or if the associated event target is null for some unknown reason.
*/
this._mostRecentTarget = null;
/** The underlying BehaviorSubject that emits whenever an input modality is detected. */
this._modality = new BehaviorSubject(null);
/**
* The timestamp of the last touch input modality. Used to determine whether mousedown events
* should be attributed to mouse or touch.
*/
this._lastTouchMs = 0;
/**
* Handles keydown events. Must be an arrow function in order to preserve the context when it gets
* bound.
*/
this._onKeydown = (event) => {
// If this is one of the keys we should ignore, then ignore it and don't update the input
// modality to keyboard.
if (this._options?.ignoreKeys?.some(keyCode => keyCode === event.keyCode)) {
return;
}
this._modality.next('keyboard');
this._mostRecentTarget = _getEventTarget(event);
};
/**
* Handles mousedown events. Must be an arrow function in order to preserve the context when it
* gets bound.
*/
this._onMousedown = (event) => {
// Touches trigger both touch and mouse events, so we need to distinguish between mouse events
// that were triggered via mouse vs touch. To do so, check if the mouse event occurs closely
// after the previous touch event.
if (Date.now() - this._lastTouchMs < TOUCH_BUFFER_MS) {
return;
}
// Fake mousedown events are fired by some screen readers when controls are activated by the
// screen reader. Attribute them to keyboard input modality.
this._modality.next(isFakeMousedownFromScreenReader(event) ? 'keyboard' : 'mouse');
this._mostRecentTarget = _getEventTarget(event);
};
/**
* Handles touchstart events. Must be an arrow function in order to preserve the context when it
* gets bound.
*/
this._onTouchstart = (event) => {
// Same scenario as mentioned in _onMousedown, but on touch screen devices, fake touchstart
// events are fired. Again, attribute to keyboard input modality.
if (isFakeTouchstartFromScreenReader(event)) {
this._modality.next('keyboard');
return;
}
// Store the timestamp of this touch event, as it's used to distinguish between mouse events
// triggered via mouse vs touch.
this._lastTouchMs = Date.now();
this._modality.next('touch');
this._mostRecentTarget = _getEventTarget(event);
};
this._options = {
...INPUT_MODALITY_DETECTOR_DEFAULT_OPTIONS,
...options,
};
// Skip the first emission as it's null.
this.modalityDetected = this._modality.pipe(skip(1));
this.modalityChanged = this.modalityDetected.pipe(distinctUntilChanged());
// If we're not in a browser, this service should do nothing, as there's no relevant input
// modality to detect.
if (_platform.isBrowser) {
ngZone.runOutsideAngular(() => {
document.addEventListener('keydown', this._onKeydown, modalityEventListenerOptions);
document.addEventListener('mousedown', this._onMousedown, modalityEventListenerOptions);
document.addEventListener('touchstart', this._onTouchstart, modalityEventListenerOptions);
});
}
}
ngOnDestroy() {
this._modality.complete();
if (this._platform.isBrowser) {
document.removeEventListener('keydown', this._onKeydown, modalityEventListenerOptions);
document.removeEventListener('mousedown', this._onMousedown, modalityEventListenerOptions);
document.removeEventListener('touchstart', this._onTouchstart, modalityEventListenerOptions);
}
}
static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: InputModalityDetector, deps: [{ token: i1.Platform }, { token: i0.NgZone }, { token: DOCUMENT }, { token: INPUT_MODALITY_DETECTOR_OPTIONS, optional: true }], target: i0.ɵɵFactoryTarget.Injectable }); }
static { this.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: InputModalityDetector, providedIn: 'root' }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: InputModalityDetector, decorators: [{
type: Injectable,
args: [{ providedIn: 'root' }]
}], ctorParameters: function () { return [{ type: i1.Platform }, { type: i0.NgZone }, { type: Document, decorators: [{
type: Inject,
args: [DOCUMENT]
}] }, { type: undefined, decorators: [{
type: Optional
}, {
type: Inject,
args: [INPUT_MODALITY_DETECTOR_OPTIONS]
}] }]; } });
const LIVE_ANNOUNCER_ELEMENT_TOKEN = new InjectionToken('liveAnnouncerElement', {
providedIn: 'root',
factory: LIVE_ANNOUNCER_ELEMENT_TOKEN_FACTORY,
});
/** @docs-private */
function LIVE_ANNOUNCER_ELEMENT_TOKEN_FACTORY() {
return null;
}
/** Injection token that can be used to configure the default options for the LiveAnnouncer. */
const LIVE_ANNOUNCER_DEFAULT_OPTIONS = new InjectionToken('LIVE_ANNOUNCER_DEFAULT_OPTIONS');
let uniqueIds = 0;
class LiveAnnouncer {
constructor(elementToken, _ngZone, _document, _defaultOptions) {
this._ngZone = _ngZone;
this._defaultOptions = _defaultOptions;
// We inject the live element and document as `any` because the constructor signature cannot
// reference browser globals (HTMLElement, Document) on non-browser environments, since having
// a class decorator causes TypeScript to preserve the constructor signature types.
this._document = _document;
this._liveElement = elementToken || this._createLiveElement();
}
announce(message, ...args) {
const defaultOptions = this._defaultOptions;
let politeness;
let duration;
if (args.length === 1 && typeof args[0] === 'number') {
duration = args[0];
}
else {
[politeness, duration] = args;
}
this.clear();
clearTimeout(this._previousTimeout);
if (!politeness) {
politeness =
defaultOptions && defaultOptions.politeness ? defaultOptions.politeness : 'polite';
}
if (duration == null && defaultOptions) {
duration = defaultOptions.duration;
}
// TODO: ensure changing the politeness works on all environments we support.
this._liveElement.setAttribute('aria-live', politeness);
if (this._liveElement.id) {
this._exposeAnnouncerToModals(this._liveElement.id);
}
// This 100ms timeout is necessary for some browser + screen-reader combinations:
// - Both JAWS and NVDA over IE11 will not announce anything without a non-zero timeout.
// - With Chrome and IE11 with NVDA or JAWS, a repeated (identical) message won't be read a
// second time without clearing and then using a non-zero delay.
// (using JAWS 17 at time of this writing).
return this._ngZone.runOutsideAngular(() => {
if (!this._currentPromise) {
this._currentPromise = new Promise(resolve => (this._currentResolve = resolve));
}
clearTimeout(this._previousTimeout);
this._previousTimeout = setTimeout(() => {
this._liveElement.textContent = message;
if (typeof duration === 'number') {
this._previousTimeout = setTimeout(() => this.clear(), duration);
}
this._currentResolve();
this._currentPromise = this._currentResolve = undefined;
}, 100);
return this._currentPromise;
});
}
/**
* Clears the current text from the announcer element. Can be used to prevent
* screen readers from reading the text out again while the user is going
* through the page landmarks.
*/
clear() {
if (this._liveElement) {
this._liveElement.textContent = '';
}
}
ngOnDestroy() {
clearTimeout(this._previousTimeout);
this._liveElement?.remove();
this._liveElement = null;
this._currentResolve?.();
this._currentPromise = this._currentResolve = undefined;
}
_createLiveElement() {
const elementClass = 'cdk-live-announcer-element';
const previousElements = this._document.getElementsByClassName(elementClass);
const liveEl = this._document.createElement('div');
// Remove any old containers. This can happen when coming in from a server-side-rendered page.
for (let i = 0; i < previousElements.length; i++) {
previousElements[i].remove();
}
liveEl.classList.add(elementClass);
liveEl.classList.add('cdk-visually-hidden');
liveEl.setAttribute('aria-atomic', 'true');
liveEl.setAttribute('aria-live', 'polite');
liveEl.id = `cdk-live-announcer-${uniqueIds++}`;
this._document.body.appendChild(liveEl);
return liveEl;
}
/**
* Some browsers won't expose the accessibility node of the live announcer element if there is an
* `aria-modal` and the live announcer is outside of it. This method works around the issue by
* pointing the `aria-owns` of all modals to the live announcer element.
*/
_exposeAnnouncerToModals(id) {
// TODO(http://github.com/angular/components/issues/26853): consider de-duplicating this with
// the `SnakBarContainer` and other usages.
//
// Note that the selector here is limited to CDK overlays at the moment in order to reduce the
// section of the DOM we need to look through. This should cover all the cases we support, but
// the selector can be expanded if it turns out to be too narrow.
const modals = this._document.querySelectorAll('body > .cdk-overlay-container [aria-modal="true"]');
for (let i = 0; i < modals.length; i++) {
const modal = modals[i];
const ariaOwns = modal.getAttribute('aria-owns');
if (!ariaOwns) {
modal.setAttribute('aria-owns', id);
}
else if (ariaOwns.indexOf(id) === -1) {
modal.setAttribute('aria-owns', ariaOwns + ' ' + id);
}
}
}
static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: LiveAnnouncer, deps: [{ token: LIVE_ANNOUNCER_ELEMENT_TOKEN, optional: true }, { token: i0.NgZone }, { token: DOCUMENT }, { token: LIVE_ANNOUNCER_DEFAULT_OPTIONS, optional: true }], target: i0.ɵɵFactoryTarget.Injectable }); }
static { this.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: LiveAnnouncer, providedIn: 'root' }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: LiveAnnouncer, decorators: [{
type: Injectable,
args: [{ providedIn: 'root' }]
}], ctorParameters: function () { return [{ type: undefined, decorators: [{
type: Optional
}, {
type: Inject,
args: [LIVE_ANNOUNCER_ELEMENT_TOKEN]
}] }, { type: i0.NgZone }, { type: undefined, decorators: [{
type: Inject,
args: [DOCUMENT]
}] }, { type: undefined, decorators: [{
type: Optional
}, {
type: Inject,
args: [LIVE_ANNOUNCER_DEFAULT_OPTIONS]
}] }]; } });
/**
* A directive that works similarly to aria-live, but uses the LiveAnnouncer to ensure compatibility
* with a wider range of browsers and screen readers.
*/
class CdkAriaLive {
/** The aria-live politeness level to use when announcing messages. */
get politeness() {
return this._politeness;
}
set politeness(value) {
this._politeness = value === 'off' || value === 'assertive' ? value : 'polite';
if (this._politeness === 'off') {
if (this._subscription) {
this._subscription.unsubscribe();
this._subscription = null;
}
}
else if (!this._subscription) {
this._subscription = this._ngZone.runOutsideAngular(() => {
return this._contentObserver.observe(this._elementRef).subscribe(() => {
// Note that we use textContent here, rather than innerText, in order to avoid a reflow.
const elementText = this._elementRef.nativeElement.textContent;
// The `MutationObserver` fires also for attribute
// changes which we don't want to announce.
if (elementText !== this._previousAnnouncedText) {
this._liveAnnouncer.announce(elementText, this._politeness, this.duration);
this._previousAnnouncedText = elementText;
}
});
});
}
}
constructor(_elementRef, _liveAnnouncer, _contentObserver, _ngZone) {
this._elementRef = _elementRef;
this._liveAnnouncer = _liveAnnouncer;
this._contentObserver = _contentObserver;
this._ngZone = _ngZone;
this._politeness = 'polite';
}
ngOnDestroy() {
if (this._subscription) {
this._subscription.unsubscribe();
}
}
static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: CdkAriaLive, deps: [{ token: i0.ElementRef }, { token: LiveAnnouncer }, { token: i1$1.ContentObserver }, { token: i0.NgZone }], target: i0.ɵɵFactoryTarget.Directive }); }
static { this.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "14.0.0", version: "16.1.1", type: CdkAriaLive, selector: "[cdkAriaLive]", inputs: { politeness: ["cdkAriaLive", "politeness"], duration: ["cdkAriaLiveDuration", "duration"] }, exportAs: ["cdkAriaLive"], ngImport: i0 }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: CdkAriaLive, decorators: [{
type: Directive,
args: [{
selector: '[cdkAriaLive]',
exportAs: 'cdkAriaLive',
}]
}], ctorParameters: function () { return [{ type: i0.ElementRef }, { type: LiveAnnouncer }, { type: i1$1.ContentObserver }, { type: i0.NgZone }]; }, propDecorators: { politeness: [{
type: Input,
args: ['cdkAriaLive']
}], duration: [{
type: Input,
args: ['cdkAriaLiveDuration']
}] } });
/** InjectionToken for FocusMonitorOptions. */
const FOCUS_MONITOR_DEFAULT_OPTIONS = new InjectionToken('cdk-focus-monitor-default-options');
/**
* Event listener options that enable capturing and also
* mark the listener as passive if the browser supports it.
*/
const captureEventListenerOptions = normalizePassiveListenerOptions({
passive: true,
capture: true,
});
/** Monitors mouse and keyboard events to determine the cause of focus events. */
class FocusMonitor {
constructor(_ngZone, _platform, _inputModalityDetector,
/** @breaking-change 11.0.0 make document required */
document, options) {
this._ngZone = _ngZone;
this._platform = _platform;
this._inputModalityDetector = _inputModalityDetector;
/** The focus origin that the next focus event is a result of. */
this._origin = null;
/** Whether the window has just been focused. */
this._windowFocused = false;
/**
* Whether the origin was determined via a touch interaction. Necessary as properly attributing
* focus events to touch interactions requires special logic.
*/
this._originFromTouchInteraction = false;
/** Map of elements being monitored to their info. */
this._elementInfo = new Map();
/** The number of elements currently being monitored. */
this._monitoredElementCount = 0;
/**
* Keeps track of the root nodes to which we've currently bound a focus/blur handler,
* as well as the number of monitored elements that they contain. We have to treat focus/blur
* handlers differently from the rest of the events, because the browser won't emit events
* to the document when focus moves inside of a shadow root.
*/
this._rootNodeFocusListenerCount = new Map();
/**
* Event listener for `focus` events on the window.
* Needs to be an arrow function in order to preserve the context when it gets bound.
*/
this._windowFocusListener = () => {
// Make a note of when the window regains focus, so we can
// restore the origin info for the focused element.
this._windowFocused = true;
this._windowFocusTimeoutId = window.setTimeout(() => (this._windowFocused = false));
};
/** Subject for stopping our InputModalityDetector subscription. */
this._stopInputModalityDetector = new Subject();
/**
* Event listener for `focus` and 'blur' events on the document.
* Needs to be an arrow function in order to preserve the context when it gets bound.
*/
this._rootNodeFocusAndBlurListener = (event) => {
const target = _getEventTarget(event);
// We need to walk up the ancestor chain in order to support `checkChildren`.
for (let element = target; element; element = element.parentElement) {
if (event.type === 'focus') {
this._onFocus(event, element);
}
else {
this._onBlur(event, element);
}
}
};
this._document = document;
this._detectionMode = options?.detectionMode || 0 /* FocusMonitorDetectionMode.IMMEDIATE */;
}
monitor(element, checkChildren = false) {
const nativeElement = coerceElement(element);
// Do nothing if we're not on the browser platform or the passed in node isn't an element.
if (!this._platform.isBrowser || nativeElement.nodeType !== 1) {
// Note: we don't want the observable to emit at all so we don't pass any parameters.
return of();
}
// If the element is inside the shadow DOM, we need to bind our focus/blur listeners to
// the shadow root, rather than the `document`, because the browser won't emit focus events
// to the `document`, if focus is moving within the same shadow root.
const rootNode = _getShadowRoot(nativeElement) || this._getDocument();
const cachedInfo = this._elementInfo.get(nativeElement);
// Check if we're already monitoring this element.
if (cachedInfo) {
if (checkChildren) {
// TODO(COMP-318): this can be problematic, because it'll turn all non-checkChildren
// observers into ones that behave as if `checkChildren` was turned on. We need a more
// robust solution.
cachedInfo.checkChildren = true;
}
return cachedInfo.subject;
}
// Create monitored element info.
const info = {
checkChildren: checkChildren,
subject: new Subject(),
rootNode,
};
this._elementInfo.set(nativeElement, info);
this._registerGlobalListeners(info);
return info.subject;
}
stopMonitoring(element) {
const nativeElement = coerceElement(element);
const elementInfo = this._elementInfo.get(nativeElement);
if (elementInfo) {
elementInfo.subject.complete();
this._setClasses(nativeElement);
this._elementInfo.delete(nativeElement);
this._removeGlobalListeners(elementInfo);
}
}
focusVia(element, origin, options) {
const nativeElement = coerceElement(element);
const focusedElement = this._getDocument().activeElement;
// If the element is focused already, calling `focus` again won't trigger the event listener
// which means that the focus classes won't be updated. If that's the case, update the classes
// directly without waiting for an event.
if (nativeElement === focusedElement) {
this._getClosestElementsInfo(nativeElement).forEach(([currentElement, info]) => this._originChanged(currentElement, origin, info));
}
else {
this._setOrigin(origin);
// `focus` isn't available on the server
if (typeof nativeElement.focus === 'function') {
nativeElement.focus(options);
}
}
}
ngOnDestroy() {
this._elementInfo.forEach((_info, element) => this.stopMonitoring(element));
}
/** Access injected document if available or fallback to global document reference */
_getDocument() {
return this._document || document;
}
/** Use defaultView of injected document if available or fallback to global window reference */
_getWindow() {
const doc = this._getDocument();
return doc.defaultView || window;
}
_getFocusOrigin(focusEventTarget) {
if (this._origin) {
// If the origin was realized via a touch interaction, we need to perform additional checks
// to determine whether the focus origin should be attributed to touch or program.
if (this._originFromTouchInteraction) {
return this._shouldBeAttributedToTouch(focusEventTarget) ? 'touch' : 'program';
}
else {
return this._origin;
}
}
// If the window has just regained focus, we can restore the most recent origin from before the
// window blurred. Otherwise, we've reached the point where we can't identify the source of the
// focus. This typically means one of two things happened:
//
// 1) The element was programmatically focused, or
// 2) The element was focused via screen reader navigation (which generally doesn't fire
// events).
//
// Because we can't distinguish between these two cases, we default to setting `program`.
if (this._windowFocused && this._lastFocusOrigin) {
return this._lastFocusOrigin;
}
// If the interaction is coming from an input label, we consider it a mouse interactions.
// This is a special case where focus moves on `click`, rather than `mousedown` which breaks
// our detection, because all our assumptions are for `mousedown`. We need to handle this
// special case, because it's very common for checkboxes and radio buttons.
if (focusEventTarget && this._isLastInteractionFromInputLabel(focusEventTarget)) {
return 'mouse';
}
return 'program';
}
/**
* Returns whether the focus event should be attributed to touch. Recall that in IMMEDIATE mode, a
* touch origin isn't immediately reset at the next tick (see _setOrigin). This means that when we
* handle a focus event following a touch interaction, we need to determine whether (1) the focus
* event was directly caused by the touch interaction or (2) the focus event was caused by a
* subsequent programmatic focus call triggered by the touch interaction.
* @param focusEventTarget The target of the focus event under examination.
*/
_shouldBeAttributedToTouch(focusEventTarget) {
// Please note that this check is not perfect. Consider the following edge case:
//
// <div #parent tabindex="0">
// <div #child tabindex="0" (click)="#parent.focus()"></div>
// </div>
//
// Suppose there is a FocusMonitor in IMMEDIATE mode attached to #parent. When the user touches
// #child, #parent is programmatically focused. This code will attribute the focus to touch
// instead of program. This is a relatively minor edge-case that can be worked around by using
// focusVia(parent, 'program') to focus #parent.
return (this._detectionMode === 1 /* FocusMonitorDetectionMode.EVENTUAL */ ||
!!focusEventTarget?.contains(this._inputModalityDetector._mostRecentTarget));
}
/**
* Sets the focus classes on the element based on the given focus origin.
* @param element The element to update the classes on.
* @param origin The focus origin.
*/
_setClasses(element, origin) {
element.classList.toggle('cdk-focused', !!origin);
element.classList.toggle('cdk-touch-focused', origin === 'touch');
element.classList.toggle('cdk-keyboard-focused', origin === 'keyboard');
element.classList.toggle('cdk-mouse-focused', origin === 'mouse');
element.classList.toggle('cdk-program-focused', origin === 'program');
}
/**
* Updates the focus origin. If we're using immediate detection mode, we schedule an async
* function to clear the origin at the end of a timeout. The duration of the timeout depends on
* the origin being set.
* @param origin The origin to set.
* @param isFromInteraction Whether we are setting the origin from an interaction event.
*/
_setOrigin(origin, isFromInteraction = false) {
this._ngZone.runOutsideAngular(() => {
this._origin = origin;
this._originFromTouchInteraction = origin === 'touch' && isFromInteraction;
// If we're in IMMEDIATE mode, reset the origin at the next tick (or in `TOUCH_BUFFER_MS` ms
// for a touch event). We reset the origin at the next tick because Firefox focuses one tick
// after the interaction event. We wait `TOUCH_BUFFER_MS` ms before resetting the origin for
// a touch event because when a touch event is fired, the associated focus event isn't yet in
// the event queue. Before doing so, clear any pending timeouts.
if (this._detectionMode === 0 /* FocusMonitorDetectionMode.IMMEDIATE */) {
clearTimeout(this._originTimeoutId);
const ms = this._originFromTouchInteraction ? TOUCH_BUFFER_MS : 1;
this._originTimeoutId = setTimeout(() => (this._origin = null), ms);
}
});
}
/**
* Handles focus events on a registered element.
* @param event The focus event.
* @param element The monitored element.
*/
_onFocus(event, element) {
// NOTE(mmalerba): We currently set the classes based on the focus origin of the most recent
// focus event affecting the monitored element. If we want to use the origin of the first event
// instead we should check for the cdk-focused class here and return if the element already has
// it. (This only matters for elements that have includesChildren = true).
// If we are not counting child-element-focus as focused, make sure that the event target is the
// monitored element itself.
const elementInfo = this._elementInfo.get(element);
const focusEventTarget = _getEventTarget(event);
if (!elementInfo || (!elementInfo.checkChildren && element !== focusEventTarget)) {
return;
}
this._originChanged(element, this._getFocusOrigin(focusEventTarget), elementInfo);
}
/**
* Handles blur events on a registered element.
* @param event The blur event.
* @param element The monitored element.
*/
_onBlur(event, element) {
// If we are counting child-element-focus as focused, make sure that we aren't just blurring in
// order to focus another child of the monitored element.
const elementInfo = this._elementInfo.get(element);
if (!elementInfo ||
(elementInfo.checkChildren &&
event.relatedTarget instanceof Node &&
element.contains(event.relatedTarget))) {
return;
}
this._setClasses(element);
this._emitOrigin(elementInfo, null);
}
_emitOrigin(info, origin) {
if (info.subject.observers.length) {
this._ngZone.run(() => info.subject.next(origin));
}
}
_registerGlobalListeners(elementInfo) {
if (!this._platform.isBrowser) {
return;
}
const rootNode = elementInfo.rootNode;
const rootNodeFocusListeners = this._rootNodeFocusListenerCount.get(rootNode) || 0;
if (!rootNodeFocusListeners) {
this._ngZone.runOutsideAngular(() => {
rootNode.addEventListener('focus', this._rootNodeFocusAndBlurListener, captureEventListenerOptions);
rootNode.addEventListener('blur', this._rootNodeFocusAndBlurListener, captureEventListenerOptions);
});
}
this._rootNodeFocusListenerCount.set(rootNode, rootNodeFocusListeners + 1);
// Register global listeners when first element is monitored.
if (++this._monitoredElementCount === 1) {
// Note: we listen to events in the capture phase so we
// can detect them even if the user stops propagation.
this._ngZone.runOutsideAngular(() => {
const window = this._getWindow();
window.addEventListener('focus', this._windowFocusListener);
});
// The InputModalityDetector is also just a collection of global listeners.
this._inputModalityDetector.modalityDetected
.pipe(takeUntil(this._stopInputModalityDetector))
.subscribe(modality => {
this._setOrigin(modality, true /* isFromInteraction */);
});
}
}
_removeGlobalListeners(elementInfo) {
const rootNode = elementInfo.rootNode;
if (this._rootNodeFocusListenerCount.has(rootNode)) {
const rootNodeFocusListeners = this._rootNodeFocusListenerCount.get(rootNode);
if (rootNodeFocusListeners > 1) {
this._rootNodeFocusListenerCount.set(rootNode, rootNodeFocusListeners - 1);
}
else {
rootNode.removeEventListener('focus', this._rootNodeFocusAndBlurListener, captureEventListenerOptions);
rootNode.removeEventListener('blur', this._rootNodeFocusAndBlurListener, captureEventListenerOptions);
this._rootNodeFocusListenerCount.delete(rootNode);
}
}
// Unregister global listeners when last element is unmonitored.
if (!--this._monitoredElementCount) {
const window = this._getWindow();
window.removeEventListener('focus', this._windowFocusListener);
// Equivalently, stop our InputModalityDetector subscription.
this._stopInputModalityDetector.next();
// Clear timeouts for all potentially pending timeouts to prevent the leaks.
clearTimeout(this._windowFocusTimeoutId);
clearTimeout(this._originTimeoutId);
}
}
/** Updates all the state on an element once its focus origin has changed. */
_originChanged(element, origin, elementInfo) {
this._setClasses(element, origin);
this._emitOrigin(elementInfo, origin);
this._lastFocusOrigin = origin;
}
/**
* Collects the `MonitoredElementInfo` of a particular element and
* all of its ancestors that have enabled `checkChildren`.
* @param element Element from which to start the search.
*/
_getClosestElementsInfo(element) {
const results = [];
this._elementInfo.forEach((info, currentElement) => {
if (currentElement === element || (info.checkChildren && currentElement.contains(element))) {
results.push([currentElement, info]);
}
});
return results;
}
/**
* Returns whether an interaction is likely to have come from the user clicking the `label` of
* an `input` or `textarea` in order to focus it.
* @param focusEventTarget Target currently receiving focus.
*/
_isLastInteractionFromInputLabel(focusEventTarget) {
const { _mostRecentTarget: mostRecentTarget, mostRecentModality } = this._inputModalityDetector;
// If the last interaction used the mouse on an element contained by one of the labels
// of an `input`/`textarea` that is currently focused, it is very likely that the
// user redirected focus using the label.
if (mostRecentModality !== 'mouse' ||
!mostRecentTarget ||
mostRecentTarget === focusEventTarget ||
(focusEventTarget.nodeName !== 'INPUT' && focusEventTarget.nodeName !== 'TEXTAREA') ||
focusEventTarget.disabled) {
return false;
}
const labels = focusEventTarget.labels;
if (labels) {
for (let i = 0; i < labels.length; i++) {
if (labels[i].contains(mostRecentTarget)) {
return true;
}
}
}
return false;
}
static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: FocusMonitor, deps: [{ token: i0.NgZone }, { token: i1.Platform }, { token: InputModalityDetector }, { token: DOCUMENT, optional: true }, { token: FOCUS_MONITOR_DEFAULT_OPTIONS, optional: true }], target: i0.ɵɵFactoryTarget.Injectable }); }
static { this.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: FocusMonitor, providedIn: 'root' }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: FocusMonitor, decorators: [{
type: Injectable,
args: [{ providedIn: 'root' }]
}], ctorParameters: function () { return [{ type: i0.NgZone }, { type: i1.Platform }, { type: InputModalityDetector }, { type: undefined, decorators: [{
type: Optional
}, {
type: Inject,
args: [DOCUMENT]
}] }, { type: undefined, decorators: [{
type: Optional
}, {
type: Inject,
args: [FOCUS_MONITOR_DEFAULT_OPTIONS]
}] }]; } });
/**
* Directive that determines how a particular element was focused (via keyboard, mouse, touch, or
* programmatically) and adds corresponding classes to the element.
*
* There are two variants of this directive:
* 1) cdkMonitorElementFocus: does not consider an element to be focused if one of its children is
* focused.
* 2) cdkMonitorSubtreeFocus: considers an element focused if it or any of its children are focused.
*/
class CdkMonitorFocus {
constructor(_elementRef, _focusMonitor) {
this._elementRef = _elementRef;
this._focusMonitor = _focusMonitor;
this._focusOrigin = null;
this.cdkFocusChange = new EventEmitter();
}
get focusOrigin() {
return this._focusOrigin;
}
ngAfterViewInit() {
const element = this._elementRef.nativeElement;
this._monitorSubscription = this._focusMonitor
.monitor(element, element.nodeType === 1 && element.hasAttribute('cdkMonitorSubtreeFocus'))
.subscribe(origin => {
this._focusOrigin = origin;
this.cdkFocusChange.emit(origin);
});
}
ngOnDestroy() {
this._focusMonitor.stopMonitoring(this._elementRef);
if (this._monitorSubscription) {
this._monitorSubscription.unsubscribe();
}
}
static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: CdkMonitorFocus, deps: [{ token: i0.ElementRef }, { token: FocusMonitor }], target: i0.ɵɵFactoryTarget.Directive }); }
static { this.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "14.0.0", version: "16.1.1", type: CdkMonitorFocus, selector: "[cdkMonitorElementFocus], [cdkMonitorSubtreeFocus]", outputs: { cdkFocusChange: "cdkFocusChange" }, exportAs: ["cdkMonitorFocus"], ngImport: i0 }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: CdkMonitorFocus, decorators: [{
type: Directive,
args: [{
selector: '[cdkMonitorElementFocus], [cdkMonitorSubtreeFocus]',
exportAs: 'cdkMonitorFocus',
}]
}], ctorParameters: function () { return [{ type: i0.ElementRef }, { type: FocusMonitor }]; }, propDecorators: { cdkFocusChange: [{
type: Output
}] } });
/** CSS class applied to the document body when in black-on-white high-contrast mode. */
const BLACK_ON_WHITE_CSS_CLASS = 'cdk-high-contrast-black-on-white';
/** CSS class applied to the document body when in white-on-black high-contrast mode. */
const WHITE_ON_BLACK_CSS_CLASS = 'cdk-high-contrast-white-on-black';
/** CSS class applied to the document body when in high-contrast mode. */
const HIGH_CONTRAST_MODE_ACTIVE_CSS_CLASS = 'cdk-high-contrast-active';
/**
* Service to determine whether the browser is currently in a high-contrast-mode environment.
*
* Microsoft Windows supports an accessibility feature called "High Contrast Mode". This mode
* changes the appearance of all applications, including web applications, to dramatically increase
* contrast.
*
* IE, Edge, and Firefox currently support this mode. Chrome does not support Windows High Contrast
* Mode. This service does not detect high-contrast mode as added by the Chrome "High Contrast"
* browser extension.
*/
class HighContrastModeDetector {
constructor(_platform, document) {
this._platform = _platform;
this._document = document;
this._breakpointSubscription = inject(BreakpointObserver)
.observe('(forced-colors: active)')
.subscribe(() => {
if (this._hasCheckedHighContrastMode) {
this._hasCheckedHighContrastMode = false;
this._applyBodyHighContrastModeCssClasses();
}
});
}
/** Gets the current high-contrast-mode for the page. */
getHighContrastMode() {
if (!this._platform.isBrowser) {
return 0 /* HighContrastMode.NONE */;
}
// Create a test element with an arbitrary background-color that is neither black nor
// white; high-contrast mode will coerce the color to either black or white. Also ensure that
// appending the test element to the DOM does not affect layout by absolutely positioning it
const testElement = this._document.createElement('div');
testElement.style.backgroundColor = 'rgb(1,2,3)';
testElement.style.position = 'absolute';
this._document.body.appendChild(testElement);
// Get the computed style for the background color, collapsing spaces to normalize between
// browsers. Once we get this color, we no longer need the test element. Access the `window`
// via the document so we can fake it in tests. Note that we have extra null checks, because
// this logic will likely run during app bootstrap and throwing can break the entire app.
const documentWindow = this._document.defaultView || window;
const computedStyle = documentWindow && documentWindow.getComputedStyle
? documentWindow.getComputedStyle(testElement)
: null;
const computedColor = ((computedStyle && computedStyle.backgroundColor) || '').replace(/ /g, '');
testElement.remove();
switch (computedColor) {
// Pre Windows 11 dark theme.
case 'rgb(0,0,0)':
// Windows 11 dark themes.
case 'rgb(45,50,54)':
case 'rgb(32,32,32)':
return 2 /* HighContrastMode.WHITE_ON_BLACK */;
// Pre Windows 11 light theme.
case 'rgb(255,255,255)':
// Windows 11 light theme.
case 'rgb(255,250,239)':
return 1 /* HighContrastMode.BLACK_ON_WHITE */;
}
return 0 /* HighContrastMode.NONE */;
}
ngOnDestroy() {
this._breakpointSubscription.unsubscribe();
}
/** Applies CSS classes indicating high-contrast mode to document body (browser-only). */
_applyBodyHighContrastModeCssClasses() {
if (!this._hasCheckedHighContrastMode && this._platform.isBrowser && this._document.body) {
const bodyClasses = this._document.body.classList;
bodyClasses.remove(HIGH_CONTRAST_MODE_ACTIVE_CSS_CLASS, BLACK_ON_WHITE_CSS_CLASS, WHITE_ON_BLACK_CSS_CLASS);
this._hasCheckedHighContrastMode = true;
const mode = this.getHighContrastMode();
if (mode === 1 /* HighContrastMode.BLACK_ON_WHITE */) {
bodyClasses.add(HIGH_CONTRAST_MODE_ACTIVE_CSS_CLASS, BLACK_ON_WHITE_CSS_CLASS);
}
else if (mode === 2 /* HighContrastMode.WHITE_ON_BLACK */) {
bodyClasses.add(HIGH_CONTRAST_MODE_ACTIVE_CSS_CLASS, WHITE_ON_BLACK_CSS_CLASS);
}
}
}
static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: HighContrastModeDetector, deps: [{ token: i1.Platform }, { token: DOCUMENT }], target: i0.ɵɵFactoryTarget.Injectable }); }
static { this.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: HighContrastModeDetector, providedIn: 'root' }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: HighContrastModeDetector, decorators: [{
type: Injectable,
args: [{ providedIn: 'root' }]
}], ctorParameters: function () { return [{ type: i1.Platform }, { type: undefined, decorators: [{
type: Inject,
args: [DOCUMENT]
}] }]; } });
class A11yModule {
constructor(highContrastModeDetector) {
highContrastModeDetector._applyBodyHighContrastModeCssClasses();
}
static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: A11yModule, deps: [{ token: HighContrastModeDetector }], target: i0.ɵɵFactoryTarget.NgModule }); }
static { this.ɵmod = i0.ɵɵngDeclareNgModule({ minVersion: "14.0.0", version: "16.1.1", ngImport: i0, type: A11yModule, declarations: [CdkAriaLive, CdkTrapFocus, CdkMonitorFocus], imports: [ObserversModule], exports: [CdkAriaLive, CdkTrapFocus, CdkMonitorFocus] }); }
static { this.ɵinj = i0.ɵɵngDeclareInjector({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: A11yModule, imports: [ObserversModule] }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: A11yModule, decorators: [{
type: NgModule,
args: [{
imports: [ObserversModule],
declarations: [CdkAriaLive, CdkTrapFocus, CdkMonitorFocus],
exports: [CdkAriaLive, CdkTrapFocus, CdkMonitorFocus],
}]
}], ctorParameters: function () { return [{ type: HighContrastModeDetector }]; } });
/**
* Generated bundle index. Do not edit.
*/
export { A11yModule, ActiveDescendantKeyManager, AriaDescriber, CDK_DESCRIBEDBY_HOST_ATTRIBUTE, CDK_DESCRIBEDBY_ID_PREFIX, CdkAriaLive, CdkMonitorFocus, CdkTrapFocus, ConfigurableFocusTrap, ConfigurableFocusTrapFactory, EventListenerFocusTrapInertStrategy, FOCUS_MONITOR_DEFAULT_OPTIONS, FOCUS_TRAP_INERT_STRATEGY, FocusKeyManager, FocusMonitor, FocusTrap, FocusTrapFactory, HighContrastModeDetector, INPUT_MODALITY_DETECTOR_DEFAULT_OPTIONS, INPUT_MODALITY_DETECTOR_OPTIONS, InputModalityDetector, InteractivityChecker, IsFocusableConfig, LIVE_ANNOUNCER_DEFAULT_OPTIONS, LIVE_ANNOUNCER_ELEMENT_TOKEN, LIVE_ANNOUNCER_ELEMENT_TOKEN_FACTORY, ListKeyManager, LiveAnnouncer, MESSAGES_CONTAINER_ID, addAriaReferencedId, getAriaReferenceIds, isFakeMousedownFromScreenReader, isFakeTouchstartFromScreenReader, removeAriaReferencedId };
//# sourceMappingURL=a11y.mjs.map