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@angular/cdk

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Angular Material Component Development Kit

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/** * @license * Copyright Google LLC All Rights Reserved. * * Use of this source code is governed by an MIT-style license that can be * found in the LICENSE file at https://angular.io/license */ import { DOCUMENT } from '@angular/common'; import { Inject, Injectable } from '@angular/core'; import { addAriaReferencedId, getAriaReferenceIds, removeAriaReferencedId } from './aria-reference'; import * as i0 from "@angular/core"; import * as i1 from "@angular/common"; /** ID used for the body container where all messages are appended. */ export const MESSAGES_CONTAINER_ID = 'cdk-describedby-message-container'; /** ID prefix used for each created message element. */ export const CDK_DESCRIBEDBY_ID_PREFIX = 'cdk-describedby-message'; /** Attribute given to each host element that is described by a message element. */ export const CDK_DESCRIBEDBY_HOST_ATTRIBUTE = 'cdk-describedby-host'; /** Global incremental identifier for each registered message element. */ let nextId = 0; /** Global map of all registered message elements that have been placed into the document. */ const messageRegistry = new Map(); /** Container for all registered messages. */ let messagesContainer = null; /** * 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. */ export class AriaDescriber { constructor(_document) { this._document = _document; } /** * Adds to the host element an aria-describedby reference to a hidden element that contains * the message. If the same message has already been registered, then it will reuse the created * message element. */ describe(hostElement, message) { if (!this._canBeDescribed(hostElement, message)) { return; } if (typeof message !== 'string') { // We need to ensure that the element has an ID. this._setMessageId(message); messageRegistry.set(message, { messageElement: message, referenceCount: 0 }); } else if (!messageRegistry.has(message)) { this._createMessageElement(message); } if (!this._isElementDescribedByMessage(hostElement, message)) { this._addMessageReference(hostElement, message); } } /** Removes the host element's aria-describedby reference to the message element. */ removeDescription(hostElement, message) { if (!this._isElementNode(hostElement)) { return; } if (this._isElementDescribedByMessage(hostElement, message)) { this._removeMessageReference(hostElement, message); } // 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 = messageRegistry.get(message); if (registeredMessage && registeredMessage.referenceCount === 0) { this._deleteMessageElement(message); } } if (messagesContainer && messagesContainer.childNodes.length === 0) { this._deleteMessagesContainer(); } } /** Unregisters all created message elements and removes the message container. */ ngOnDestroy() { const describedElements = this._document.querySelectorAll(`[${CDK_DESCRIBEDBY_HOST_ATTRIBUTE}]`); for (let i = 0; i < describedElements.length; i++) { this._removeCdkDescribedByReferenceIds(describedElements[i]); describedElements[i].removeAttribute(CDK_DESCRIBEDBY_HOST_ATTRIBUTE); } if (messagesContainer) { this._deleteMessagesContainer(); } messageRegistry.clear(); } /** * Creates a new element in the visually hidden message container element with the message * as its content and adds it to the message registry. */ _createMessageElement(message) { const messageElement = this._document.createElement('div'); this._setMessageId(messageElement); messageElement.textContent = message; this._createMessagesContainer(); messagesContainer.appendChild(messageElement); messageRegistry.set(message, { messageElement, referenceCount: 0 }); } /** Assigns a unique ID to an element, if it doesn't have one already. */ _setMessageId(element) { if (!element.id) { element.id = `${CDK_DESCRIBEDBY_ID_PREFIX}-${nextId++}`; } } /** Deletes the message element from the global messages container. */ _deleteMessageElement(message) { const registeredMessage = messageRegistry.get(message); const messageElement = registeredMessage && registeredMessage.messageElement; if (messagesContainer && messageElement) { messagesContainer.removeChild(messageElement); } messageRegistry.delete(message); } /** Creates the global container for all aria-describedby messages. */ _createMessagesContainer() { if (!messagesContainer) { const preExistingContainer = this._document.getElementById(MESSAGES_CONTAINER_ID); // 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. if (preExistingContainer) { preExistingContainer.parentNode.removeChild(preExistingContainer); } messagesContainer = this._document.createElement('div'); messagesContainer.id = MESSAGES_CONTAINER_ID; messagesContainer.setAttribute('aria-hidden', 'true'); messagesContainer.style.display = 'none'; this._document.body.appendChild(messagesContainer); } } /** Deletes the global messages container. */ _deleteMessagesContainer() { if (messagesContainer && messagesContainer.parentNode) { messagesContainer.parentNode.removeChild(messagesContainer); messagesContainer = null; } } /** 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, message) { const registeredMessage = messageRegistry.get(message); // 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, ''); registeredMessage.referenceCount++; } /** * Removes a message reference from the element using aria-describedby * and decrements the registered message's reference count. */ _removeMessageReference(element, message) { const registeredMessage = messageRegistry.get(message); 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, message) { const referenceIds = getAriaReferenceIds(element, 'aria-describedby'); const registeredMessage = messageRegistry.get(message); 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; } } AriaDescriber.ɵprov = i0.ɵɵdefineInjectable({ factory: function AriaDescriber_Factory() { return new AriaDescriber(i0.ɵɵinject(i1.DOCUMENT)); }, token: AriaDescriber, providedIn: "root" }); AriaDescriber.decorators = [ { type: Injectable, args: [{ providedIn: 'root' },] } ]; AriaDescriber.ctorParameters = () => [ { type: undefined, decorators: [{ type: Inject, args: [DOCUMENT,] }] } ]; //# 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* @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {DOCUMENT} from '@angular/common';\nimport {Inject, Injectable, OnDestroy} from '@angular/core';\nimport {addAriaReferencedId, getAriaReferenceIds, removeAriaReferencedId} from './aria-reference';\n\n\n/**\n * Interface used to register message elements and keep a count of how many registrations have\n * the same message and the reference to the message element used for the `aria-describedby`.\n */\nexport interface RegisteredMessage {\n  /** The element containing the message. */\n  messageElement: Element;\n\n  /** The number of elements that reference this message element via `aria-describedby`. */\n  referenceCount: number;\n}\n\n/** ID used for the body container where all messages are appended. */\nexport const MESSAGES_CONTAINER_ID = 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If the same message has already been registered, then it will reuse the created\n   * message element.\n   */\n  describe(hostElement: Element, message: string|HTMLElement) {\n    if (!this._canBeDescribed(hostElement, message)) {\n      return;\n    }\n\n    if (typeof message !== 'string') {\n      // We need to ensure that the element has an ID.\n      this._setMessageId(message);\n      messageRegistry.set(message, {messageElement: message, referenceCount: 0});\n    } else if (!messageRegistry.has(message)) {\n      this._createMessageElement(message);\n    }\n\n    if (!this._isElementDescribedByMessage(hostElement, message)) {\n      this._addMessageReference(hostElement, message);\n    }\n  }\n\n  /** Removes the host element's aria-describedby reference to the message element. */\n  removeDescription(hostElement: Element, message: string|HTMLElement) {\n    if (!this._isElementNode(hostElement)) {\n      return;\n    }\n\n    if (this._isElementDescribedByMessage(hostElement, message)) {\n      this._removeMessageReference(hostElement, message);\n    }\n\n    // If the message is a string, it means that it's one that we created for the\n    // consumer so we can remove it safely, otherwise we should leave it in place.\n    if (typeof message === 'string') {\n      const registeredMessage = messageRegistry.get(message);\n      if (registeredMessage && registeredMessage.referenceCount === 0) {\n        this._deleteMessageElement(message);\n      }\n    }\n\n    if (messagesContainer && messagesContainer.childNodes.length === 0) {\n      this._deleteMessagesContainer();\n    }\n  }\n\n  /** Unregisters all created message elements and removes the message container. */\n  ngOnDestroy() {\n    const describedElements =\n        this._document.querySelectorAll(`[${CDK_DESCRIBEDBY_HOST_ATTRIBUTE}]`);\n\n    for (let i = 0; i < describedElements.length; i++) {\n      this._removeCdkDescribedByReferenceIds(describedElements[i]);\n      describedElements[i].removeAttribute(CDK_DESCRIBEDBY_HOST_ATTRIBUTE);\n    }\n\n    if (messagesContainer) {\n      this._deleteMessagesContainer();\n    }\n\n    messageRegistry.clear();\n  }\n\n  /**\n   * Creates a new element in the visually hidden message container element with the message\n   * as its content and adds it to the message registry.\n   */\n  private _createMessageElement(message: string) {\n    const messageElement = this._document.createElement('div');\n    this._setMessageId(messageElement);\n    messageElement.textContent = message;\n\n    this._createMessagesContainer();\n    messagesContainer!.appendChild(messageElement);\n\n    messageRegistry.set(message, {messageElement, referenceCount: 0});\n  }\n\n  /** Assigns a unique ID to an element, if it doesn't have one already. */\n  private _setMessageId(element: HTMLElement) {\n    if (!element.id) {\n      element.id = `${CDK_DESCRIBEDBY_ID_PREFIX}-${nextId++}`;\n    }\n  }\n\n  /** Deletes the message element from the global messages container. */\n  private _deleteMessageElement(message: string) {\n    const registeredMessage = messageRegistry.get(message);\n    const messageElement = registeredMessage && registeredMessage.messageElement;\n    if (messagesContainer && messageElement) {\n      messagesContainer.removeChild(messageElement);\n    }\n    messageRegistry.delete(message);\n  }\n\n  /** Creates the global container for all aria-describedby messages. */\n  private _createMessagesContainer() {\n    if (!messagesContainer) {\n      const preExistingContainer = this._document.getElementById(MESSAGES_CONTAINER_ID);\n\n      // When going from the server to the client, we may end up in a situation where there's\n      // already a container on the page, but we don't have a reference to it. Clear the\n      // old container so we don't get duplicates. Doing this, instead of emptying the previous\n      // container, should be slightly faster.\n      if (preExistingContainer) {\n        preExistingContainer.parentNode!.removeChild(preExistingContainer);\n      }\n\n      messagesContainer = this._document.createElement('div');\n      messagesContainer.id = MESSAGES_CONTAINER_ID;\n      messagesContainer.setAttribute('aria-hidden', 'true');\n      messagesContainer.style.display = 'none';\n      this._document.body.appendChild(messagesContainer);\n    }\n  }\n\n  /** Deletes the global messages container. */\n  private _deleteMessagesContainer() {\n    if (messagesContainer && messagesContainer.parentNode) {\n      messagesContainer.parentNode.removeChild(messagesContainer);\n      messagesContainer = null;\n    }\n  }\n\n  /** Removes all cdk-describedby messages that are hosted through the element. */\n  private _removeCdkDescribedByReferenceIds(element: Element) {\n    // Remove all aria-describedby reference IDs that are prefixed by CDK_DESCRIBEDBY_ID_PREFIX\n    const originalReferenceIds = getAriaReferenceIds(element, 'aria-describedby')\n        .filter(id => id.indexOf(CDK_DESCRIBEDBY_ID_PREFIX) != 0);\n    element.setAttribute('aria-describedby', originalReferenceIds.join(' '));\n  }\n\n  /**\n   * Adds a message reference to the element using aria-describedby and increments the registered\n   * message's reference count.\n   */\n  private _addMessageReference(element: Element, message: string|HTMLElement) {\n    const registeredMessage = messageRegistry.get(message)!;\n\n    // Add the aria-describedby reference and set the\n    // describedby_host attribute to mark the element.\n    addAriaReferencedId(element, 'aria-describedby', registeredMessage.messageElement.id);\n    element.setAttribute(CDK_DESCRIBEDBY_HOST_ATTRIBUTE, '');\n\n    registeredMessage.referenceCount++;\n  }\n\n  /**\n   * Removes a message reference from the element using aria-describedby\n   * and decrements the registered message's reference count.\n   */\n  private _removeMessageReference(element: Element, message: string|HTMLElement) {\n    const registeredMessage = messageRegistry.get(message)!;\n    registeredMessage.referenceCount--;\n\n    removeAriaReferencedId(element, 'aria-describedby', registeredMessage.messageElement.id);\n    element.removeAttribute(CDK_DESCRIBEDBY_HOST_ATTRIBUTE);\n  }\n\n  /** Returns true if the element has been described by the provided message ID. */\n  private _isElementDescribedByMessage(element: Element, message: string|HTMLElement): boolean {\n    const referenceIds = getAriaReferenceIds(element, 'aria-describedby');\n    const registeredMessage = messageRegistry.get(message);\n    const messageId = registeredMessage && registeredMessage.messageElement.id;\n\n    return !!messageId && referenceIds.indexOf(messageId) != -1;\n  }\n\n  /** Determines whether a message can be described on a particular element. */\n  private _canBeDescribed(element: Element, message: string|HTMLElement|void): boolean {\n    if (!this._isElementNode(element)) {\n      return false;\n    }\n\n    if (message && typeof message === 'object') {\n      // We'd have to make some assumptions about the description element's text, if the consumer\n      // passed in an element. Assume that if an element is passed in, the consumer has verified\n      // that it can be used as a description.\n      return true;\n    }\n\n    const trimmedMessage = message == null ? '' : `${message}`.trim();\n    const ariaLabel = element.getAttribute('aria-label');\n\n    // We shouldn't set descriptions if they're exactly the same as the `aria-label` of the\n    // element, because screen readers will end up reading out the same text twice in a row.\n    return trimmedMessage ? (!ariaLabel || ariaLabel.trim() !== trimmedMessage) : false;\n  }\n\n  /** Checks whether a node is an Element node. */\n  private _isElementNode(element: Node): element is Element {\n    return element.nodeType === this._document.ELEMENT_NODE;\n  }\n}\n"]}