@angular/material
Version:
Angular Material
277 lines • 51.1 kB
JavaScript
/**
* @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 { ChangeDetectionStrategy, ChangeDetectorRef, Component, ElementRef, inject, NgZone, ViewChild, ViewEncapsulation, } from '@angular/core';
import { DOCUMENT } from '@angular/common';
import { matSnackBarAnimations } from './snack-bar-animations';
import { BasePortalOutlet, CdkPortalOutlet, } from '@angular/cdk/portal';
import { Subject } from 'rxjs';
import { Platform } from '@angular/cdk/platform';
import { MatSnackBarConfig } from './snack-bar-config';
import * as i0 from "@angular/core";
import * as i1 from "@angular/cdk/platform";
import * as i2 from "./snack-bar-config";
let uniqueId = 0;
/**
* Internal component that wraps user-provided snack bar content.
* @docs-private
*/
export class MatSnackBarContainer extends BasePortalOutlet {
constructor(_ngZone, _elementRef, _changeDetectorRef, _platform,
/** The snack bar configuration. */
snackBarConfig) {
super();
this._ngZone = _ngZone;
this._elementRef = _elementRef;
this._changeDetectorRef = _changeDetectorRef;
this._platform = _platform;
this.snackBarConfig = snackBarConfig;
this._document = inject(DOCUMENT);
this._trackedModals = new Set();
/** The number of milliseconds to wait before announcing the snack bar's content. */
this._announceDelay = 150;
/** Whether the component has been destroyed. */
this._destroyed = false;
/** Subject for notifying that the snack bar has announced to screen readers. */
this._onAnnounce = new Subject();
/** Subject for notifying that the snack bar has exited from view. */
this._onExit = new Subject();
/** Subject for notifying that the snack bar has finished entering the view. */
this._onEnter = new Subject();
/** The state of the snack bar animations. */
this._animationState = 'void';
/** Unique ID of the aria-live element. */
this._liveElementId = `mat-snack-bar-container-live-${uniqueId++}`;
/**
* Attaches a DOM portal to the snack bar container.
* @deprecated To be turned into a method.
* @breaking-change 10.0.0
*/
this.attachDomPortal = (portal) => {
this._assertNotAttached();
const result = this._portalOutlet.attachDomPortal(portal);
this._afterPortalAttached();
return result;
};
// Use aria-live rather than a live role like 'alert' or 'status'
// because NVDA and JAWS have show inconsistent behavior with live roles.
if (snackBarConfig.politeness === 'assertive' && !snackBarConfig.announcementMessage) {
this._live = 'assertive';
}
else if (snackBarConfig.politeness === 'off') {
this._live = 'off';
}
else {
this._live = 'polite';
}
// Only set role for Firefox. Set role based on aria-live because setting role="alert" implies
// aria-live="assertive" which may cause issues if aria-live is set to "polite" above.
if (this._platform.FIREFOX) {
if (this._live === 'polite') {
this._role = 'status';
}
if (this._live === 'assertive') {
this._role = 'alert';
}
}
}
/** Attach a component portal as content to this snack bar container. */
attachComponentPortal(portal) {
this._assertNotAttached();
const result = this._portalOutlet.attachComponentPortal(portal);
this._afterPortalAttached();
return result;
}
/** Attach a template portal as content to this snack bar container. */
attachTemplatePortal(portal) {
this._assertNotAttached();
const result = this._portalOutlet.attachTemplatePortal(portal);
this._afterPortalAttached();
return result;
}
/** Handle end of animations, updating the state of the snackbar. */
onAnimationEnd(event) {
const { fromState, toState } = event;
if ((toState === 'void' && fromState !== 'void') || toState === 'hidden') {
this._completeExit();
}
if (toState === 'visible') {
// Note: we shouldn't use `this` inside the zone callback,
// because it can cause a memory leak.
const onEnter = this._onEnter;
this._ngZone.run(() => {
onEnter.next();
onEnter.complete();
});
}
}
/** Begin animation of snack bar entrance into view. */
enter() {
if (!this._destroyed) {
this._animationState = 'visible';
// _animationState lives in host bindings and `detectChanges` does not refresh host bindings
// so we have to call `markForCheck` to ensure the host view is refreshed eventually.
this._changeDetectorRef.markForCheck();
this._changeDetectorRef.detectChanges();
this._screenReaderAnnounce();
}
}
/** Begin animation of the snack bar exiting from view. */
exit() {
// It's common for snack bars to be opened by random outside calls like HTTP requests or
// errors. Run inside the NgZone to ensure that it functions correctly.
this._ngZone.run(() => {
// Note: this one transitions to `hidden`, rather than `void`, in order to handle the case
// where multiple snack bars are opened in quick succession (e.g. two consecutive calls to
// `MatSnackBar.open`).
this._animationState = 'hidden';
this._changeDetectorRef.markForCheck();
// Mark this element with an 'exit' attribute to indicate that the snackbar has
// been dismissed and will soon be removed from the DOM. This is used by the snackbar
// test harness.
this._elementRef.nativeElement.setAttribute('mat-exit', '');
// If the snack bar hasn't been announced by the time it exits it wouldn't have been open
// long enough to visually read it either, so clear the timeout for announcing.
clearTimeout(this._announceTimeoutId);
});
return this._onExit;
}
/** Makes sure the exit callbacks have been invoked when the element is destroyed. */
ngOnDestroy() {
this._destroyed = true;
this._clearFromModals();
this._completeExit();
}
/**
* Removes the element in a microtask. Helps prevent errors where we end up
* removing an element which is in the middle of an animation.
*/
_completeExit() {
queueMicrotask(() => {
this._onExit.next();
this._onExit.complete();
});
}
/**
* Called after the portal contents have been attached. Can be
* used to modify the DOM once it's guaranteed to be in place.
*/
_afterPortalAttached() {
const element = this._elementRef.nativeElement;
const panelClasses = this.snackBarConfig.panelClass;
if (panelClasses) {
if (Array.isArray(panelClasses)) {
// Note that we can't use a spread here, because IE doesn't support multiple arguments.
panelClasses.forEach(cssClass => element.classList.add(cssClass));
}
else {
element.classList.add(panelClasses);
}
}
this._exposeToModals();
// Check to see if the attached component or template uses the MDC template structure,
// specifically the MDC label. If not, the container should apply the MDC label class to this
// component's label container, which will apply MDC's label styles to the attached view.
const label = this._label.nativeElement;
const labelClass = 'mdc-snackbar__label';
label.classList.toggle(labelClass, !label.querySelector(`.${labelClass}`));
}
/**
* Some browsers won't expose the accessibility node of the live element if there is an
* `aria-modal` and the live element is outside of it. This method works around the issue by
* pointing the `aria-owns` of all modals to the live element.
*/
_exposeToModals() {
// TODO(http://github.com/angular/components/issues/26853): consider de-duplicating this with the
// `LiveAnnouncer` and any 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 id = this._liveElementId;
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');
this._trackedModals.add(modal);
if (!ariaOwns) {
modal.setAttribute('aria-owns', id);
}
else if (ariaOwns.indexOf(id) === -1) {
modal.setAttribute('aria-owns', ariaOwns + ' ' + id);
}
}
}
/** Clears the references to the live element from any modals it was added to. */
_clearFromModals() {
this._trackedModals.forEach(modal => {
const ariaOwns = modal.getAttribute('aria-owns');
if (ariaOwns) {
const newValue = ariaOwns.replace(this._liveElementId, '').trim();
if (newValue.length > 0) {
modal.setAttribute('aria-owns', newValue);
}
else {
modal.removeAttribute('aria-owns');
}
}
});
this._trackedModals.clear();
}
/** Asserts that no content is already attached to the container. */
_assertNotAttached() {
if (this._portalOutlet.hasAttached() && (typeof ngDevMode === 'undefined' || ngDevMode)) {
throw Error('Attempting to attach snack bar content after content is already attached');
}
}
/**
* Starts a timeout to move the snack bar content to the live region so screen readers will
* announce it.
*/
_screenReaderAnnounce() {
if (!this._announceTimeoutId) {
this._ngZone.runOutsideAngular(() => {
this._announceTimeoutId = setTimeout(() => {
const inertElement = this._elementRef.nativeElement.querySelector('[aria-hidden]');
const liveElement = this._elementRef.nativeElement.querySelector('[aria-live]');
if (inertElement && liveElement) {
// If an element in the snack bar content is focused before being moved
// track it and restore focus after moving to the live region.
let focusedElement = null;
if (this._platform.isBrowser &&
document.activeElement instanceof HTMLElement &&
inertElement.contains(document.activeElement)) {
focusedElement = document.activeElement;
}
inertElement.removeAttribute('aria-hidden');
liveElement.appendChild(inertElement);
focusedElement?.focus();
this._onAnnounce.next();
this._onAnnounce.complete();
}
}, this._announceDelay);
});
}
}
static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "18.0.0", ngImport: i0, type: MatSnackBarContainer, deps: [{ token: i0.NgZone }, { token: i0.ElementRef }, { token: i0.ChangeDetectorRef }, { token: i1.Platform }, { token: i2.MatSnackBarConfig }], target: i0.ɵɵFactoryTarget.Component }); }
static { this.ɵcmp = i0.ɵɵngDeclareComponent({ minVersion: "14.0.0", version: "18.0.0", type: MatSnackBarContainer, isStandalone: true, selector: "mat-snack-bar-container", host: { listeners: { "@state.done": "onAnimationEnd($event)" }, properties: { "@state": "_animationState" }, classAttribute: "mdc-snackbar mat-mdc-snack-bar-container mdc-snackbar--open" }, viewQueries: [{ propertyName: "_portalOutlet", first: true, predicate: CdkPortalOutlet, descendants: true, static: true }, { propertyName: "_label", first: true, predicate: ["label"], descendants: true, static: true }], usesInheritance: true, ngImport: i0, template: "<div class=\"mdc-snackbar__surface\">\n <!--\n This outer label wrapper will have the class `mdc-snackbar__label` applied if\n the attached template/component does not contain it.\n -->\n <div class=\"mat-mdc-snack-bar-label\" #label>\n <!-- Initialy holds the snack bar content, will be empty after announcing to screen readers. -->\n <div aria-hidden=\"true\">\n <ng-template cdkPortalOutlet />\n </div>\n\n <!-- Will receive the snack bar content from the non-live div, move will happen a short delay after opening -->\n <div [attr.aria-live]=\"_live\" [attr.role]=\"_role\" [attr.id]=\"_liveElementId\"></div>\n </div>\n</div>\n", styles: [".mdc-snackbar{display:none;position:fixed;right:0;bottom:0;left:0;align-items:center;justify-content:center;box-sizing:border-box;pointer-events:none;-webkit-tap-highlight-color:rgba(0,0,0,0)}.mdc-snackbar--opening,.mdc-snackbar--open,.mdc-snackbar--closing{display:flex}.mdc-snackbar--open .mdc-snackbar__label,.mdc-snackbar--open .mdc-snackbar__actions{visibility:visible}.mdc-snackbar__surface{padding-left:0;padding-right:8px;display:flex;align-items:center;justify-content:flex-start;box-sizing:border-box;transform:scale(0.8);opacity:0}.mdc-snackbar__surface::before{position:absolute;box-sizing:border-box;width:100%;height:100%;top:0;left:0;border:1px solid rgba(0,0,0,0);border-radius:inherit;content:\"\";pointer-events:none}@media screen and (forced-colors: active){.mdc-snackbar__surface::before{border-color:CanvasText}}[dir=rtl] .mdc-snackbar__surface,.mdc-snackbar__surface[dir=rtl]{padding-left:8px;padding-right:0}.mdc-snackbar--open .mdc-snackbar__surface{transform:scale(1);opacity:1;pointer-events:auto}.mdc-snackbar--closing .mdc-snackbar__surface{transform:scale(1)}.mdc-snackbar__label{padding-left:16px;padding-right:8px;width:100%;flex-grow:1;box-sizing:border-box;margin:0;visibility:hidden;padding-top:14px;padding-bottom:14px}[dir=rtl] .mdc-snackbar__label,.mdc-snackbar__label[dir=rtl]{padding-left:8px;padding-right:16px}.mdc-snackbar__label::before{display:inline;content:attr(data-mdc-snackbar-label-text)}.mdc-snackbar__actions{display:flex;flex-shrink:0;align-items:center;box-sizing:border-box;visibility:hidden}.mdc-snackbar__action+.mdc-snackbar__dismiss{margin-left:8px;margin-right:0}[dir=rtl] .mdc-snackbar__action+.mdc-snackbar__dismiss,.mdc-snackbar__action+.mdc-snackbar__dismiss[dir=rtl]{margin-left:0;margin-right:8px}.mat-mdc-snack-bar-container{margin:8px;position:static}.mat-mdc-snack-bar-container .mdc-snackbar__surface{min-width:344px}@media(max-width: 480px),(max-width: 344px){.mat-mdc-snack-bar-container .mdc-snackbar__surface{min-width:100%}}@media(max-width: 480px),(max-width: 344px){.mat-mdc-snack-bar-container{width:100vw}}.mat-mdc-snack-bar-container .mdc-snackbar__surface{max-width:672px}.mat-mdc-snack-bar-container .mdc-snackbar__surface{box-shadow:0px 3px 5px -1px rgba(0, 0, 0, 0.2), 0px 6px 10px 0px rgba(0, 0, 0, 0.14), 0px 1px 18px 0px rgba(0, 0, 0, 0.12)}.mat-mdc-snack-bar-container .mdc-snackbar__surface{background-color:var(--mdc-snackbar-container-color)}.mat-mdc-snack-bar-container .mdc-snackbar__surface{border-radius:var(--mdc-snackbar-container-shape)}.mat-mdc-snack-bar-container .mdc-snackbar__label{color:var(--mdc-snackbar-supporting-text-color)}.mat-mdc-snack-bar-container .mdc-snackbar__label{font-size:var(--mdc-snackbar-supporting-text-size);font-family:var(--mdc-snackbar-supporting-text-font);font-weight:var(--mdc-snackbar-supporting-text-weight);line-height:var(--mdc-snackbar-supporting-text-line-height)}.mat-mdc-snack-bar-container .mat-mdc-button.mat-mdc-snack-bar-action:not(:disabled){color:var(--mat-snack-bar-button-color);--mat-text-button-state-layer-color:currentColor;--mat-text-button-ripple-color:currentColor}.mat-mdc-snack-bar-container .mat-mdc-button.mat-mdc-snack-bar-action:not(:disabled) .mat-ripple-element{opacity:.1}.mat-mdc-snack-bar-container .mdc-snackbar__label::before{display:none}.mat-mdc-snack-bar-handset,.mat-mdc-snack-bar-container,.mat-mdc-snack-bar-label{flex:1 1 auto}.mat-mdc-snack-bar-handset .mdc-snackbar__surface{width:100%}"], dependencies: [{ kind: "directive", type: CdkPortalOutlet, selector: "[cdkPortalOutlet]", inputs: ["cdkPortalOutlet"], outputs: ["attached"], exportAs: ["cdkPortalOutlet"] }], animations: [matSnackBarAnimations.snackBarState], changeDetection: i0.ChangeDetectionStrategy.Default, encapsulation: i0.ViewEncapsulation.None }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "18.0.0", ngImport: i0, type: MatSnackBarContainer, decorators: [{
type: Component,
args: [{ selector: 'mat-snack-bar-container', changeDetection: ChangeDetectionStrategy.Default, encapsulation: ViewEncapsulation.None, animations: [matSnackBarAnimations.snackBarState], standalone: true, imports: [CdkPortalOutlet], host: {
'class': 'mdc-snackbar mat-mdc-snack-bar-container mdc-snackbar--open',
'[@state]': '_animationState',
'(@state.done)': 'onAnimationEnd($event)',
}, template: "<div class=\"mdc-snackbar__surface\">\n <!--\n This outer label wrapper will have the class `mdc-snackbar__label` applied if\n the attached template/component does not contain it.\n -->\n <div class=\"mat-mdc-snack-bar-label\" #label>\n <!-- Initialy holds the snack bar content, will be empty after announcing to screen readers. -->\n <div aria-hidden=\"true\">\n <ng-template cdkPortalOutlet />\n </div>\n\n <!-- Will receive the snack bar content from the non-live div, move will happen a short delay after opening -->\n <div [attr.aria-live]=\"_live\" [attr.role]=\"_role\" [attr.id]=\"_liveElementId\"></div>\n </div>\n</div>\n", styles: [".mdc-snackbar{display:none;position:fixed;right:0;bottom:0;left:0;align-items:center;justify-content:center;box-sizing:border-box;pointer-events:none;-webkit-tap-highlight-color:rgba(0,0,0,0)}.mdc-snackbar--opening,.mdc-snackbar--open,.mdc-snackbar--closing{display:flex}.mdc-snackbar--open .mdc-snackbar__label,.mdc-snackbar--open .mdc-snackbar__actions{visibility:visible}.mdc-snackbar__surface{padding-left:0;padding-right:8px;display:flex;align-items:center;justify-content:flex-start;box-sizing:border-box;transform:scale(0.8);opacity:0}.mdc-snackbar__surface::before{position:absolute;box-sizing:border-box;width:100%;height:100%;top:0;left:0;border:1px solid rgba(0,0,0,0);border-radius:inherit;content:\"\";pointer-events:none}@media screen and (forced-colors: active){.mdc-snackbar__surface::before{border-color:CanvasText}}[dir=rtl] .mdc-snackbar__surface,.mdc-snackbar__surface[dir=rtl]{padding-left:8px;padding-right:0}.mdc-snackbar--open .mdc-snackbar__surface{transform:scale(1);opacity:1;pointer-events:auto}.mdc-snackbar--closing .mdc-snackbar__surface{transform:scale(1)}.mdc-snackbar__label{padding-left:16px;padding-right:8px;width:100%;flex-grow:1;box-sizing:border-box;margin:0;visibility:hidden;padding-top:14px;padding-bottom:14px}[dir=rtl] .mdc-snackbar__label,.mdc-snackbar__label[dir=rtl]{padding-left:8px;padding-right:16px}.mdc-snackbar__label::before{display:inline;content:attr(data-mdc-snackbar-label-text)}.mdc-snackbar__actions{display:flex;flex-shrink:0;align-items:center;box-sizing:border-box;visibility:hidden}.mdc-snackbar__action+.mdc-snackbar__dismiss{margin-left:8px;margin-right:0}[dir=rtl] .mdc-snackbar__action+.mdc-snackbar__dismiss,.mdc-snackbar__action+.mdc-snackbar__dismiss[dir=rtl]{margin-left:0;margin-right:8px}.mat-mdc-snack-bar-container{margin:8px;position:static}.mat-mdc-snack-bar-container .mdc-snackbar__surface{min-width:344px}@media(max-width: 480px),(max-width: 344px){.mat-mdc-snack-bar-container .mdc-snackbar__surface{min-width:100%}}@media(max-width: 480px),(max-width: 344px){.mat-mdc-snack-bar-container{width:100vw}}.mat-mdc-snack-bar-container .mdc-snackbar__surface{max-width:672px}.mat-mdc-snack-bar-container .mdc-snackbar__surface{box-shadow:0px 3px 5px -1px rgba(0, 0, 0, 0.2), 0px 6px 10px 0px rgba(0, 0, 0, 0.14), 0px 1px 18px 0px rgba(0, 0, 0, 0.12)}.mat-mdc-snack-bar-container .mdc-snackbar__surface{background-color:var(--mdc-snackbar-container-color)}.mat-mdc-snack-bar-container .mdc-snackbar__surface{border-radius:var(--mdc-snackbar-container-shape)}.mat-mdc-snack-bar-container .mdc-snackbar__label{color:var(--mdc-snackbar-supporting-text-color)}.mat-mdc-snack-bar-container .mdc-snackbar__label{font-size:var(--mdc-snackbar-supporting-text-size);font-family:var(--mdc-snackbar-supporting-text-font);font-weight:var(--mdc-snackbar-supporting-text-weight);line-height:var(--mdc-snackbar-supporting-text-line-height)}.mat-mdc-snack-bar-container .mat-mdc-button.mat-mdc-snack-bar-action:not(:disabled){color:var(--mat-snack-bar-button-color);--mat-text-button-state-layer-color:currentColor;--mat-text-button-ripple-color:currentColor}.mat-mdc-snack-bar-container .mat-mdc-button.mat-mdc-snack-bar-action:not(:disabled) .mat-ripple-element{opacity:.1}.mat-mdc-snack-bar-container .mdc-snackbar__label::before{display:none}.mat-mdc-snack-bar-handset,.mat-mdc-snack-bar-container,.mat-mdc-snack-bar-label{flex:1 1 auto}.mat-mdc-snack-bar-handset .mdc-snackbar__surface{width:100%}"] }]
}], ctorParameters: () => [{ type: i0.NgZone }, { type: i0.ElementRef }, { type: i0.ChangeDetectorRef }, { type: i1.Platform }, { type: i2.MatSnackBarConfig }], propDecorators: { _portalOutlet: [{
type: ViewChild,
args: [CdkPortalOutlet, { static: true }]
}], _label: [{
type: ViewChild,
args: ['label', { static: true }]
}] } });
//# 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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 {\n  ChangeDetectionStrategy,\n  ChangeDetectorRef,\n  Component,\n  ComponentRef,\n  ElementRef,\n  EmbeddedViewRef,\n  inject,\n  NgZone,\n  OnDestroy,\n  ViewChild,\n  ViewEncapsulation,\n} from '@angular/core';\nimport {DOCUMENT} from '@angular/common';\nimport {matSnackBarAnimations} from './snack-bar-animations';\nimport {\n  BasePortalOutlet,\n  CdkPortalOutlet,\n  ComponentPortal,\n  DomPortal,\n  TemplatePortal,\n} from '@angular/cdk/portal';\nimport {Observable, Subject} from 'rxjs';\nimport {AriaLivePoliteness} from '@angular/cdk/a11y';\nimport {Platform} from '@angular/cdk/platform';\nimport {AnimationEvent} from '@angular/animations';\nimport {MatSnackBarConfig} from './snack-bar-config';\n\nlet uniqueId = 0;\n\n/**\n * Internal component that wraps user-provided snack bar content.\n * @docs-private\n */\n@Component({\n  selector: 'mat-snack-bar-container',\n  templateUrl: 'snack-bar-container.html',\n  styleUrl: 'snack-bar-container.css',\n  // In Ivy embedded views will be change detected from their declaration place, rather than\n  // where they were stamped out. This means that we can't have the snack bar container be OnPush,\n  // because it might cause snack bars that were opened from a template not to be out of date.\n  // tslint:disable-next-line:validate-decorators\n  changeDetection: ChangeDetectionStrategy.Default,\n  encapsulation: ViewEncapsulation.None,\n  animations: [matSnackBarAnimations.snackBarState],\n  standalone: true,\n  imports: [CdkPortalOutlet],\n  host: {\n    'class': 'mdc-snackbar mat-mdc-snack-bar-container mdc-snackbar--open',\n    '[@state]': '_animationState',\n    '(@state.done)': 'onAnimationEnd($event)',\n  },\n})\nexport class MatSnackBarContainer extends BasePortalOutlet implements OnDestroy {\n  private _document = inject(DOCUMENT);\n  private _trackedModals = new Set<Element>();\n\n  /** The number of milliseconds to wait before announcing the snack bar's content. */\n  private readonly _announceDelay: number = 150;\n\n  /** The timeout for announcing the snack bar's content. */\n  private _announceTimeoutId: number;\n\n  /** Whether the component has been destroyed. */\n  private _destroyed = false;\n\n  /** The portal outlet inside of this container into which the snack bar content will be loaded. */\n  @ViewChild(CdkPortalOutlet, {static: true}) _portalOutlet: CdkPortalOutlet;\n\n  /** Subject for notifying that the snack bar has announced to screen readers. */\n  readonly _onAnnounce: Subject<void> = new Subject();\n\n  /** Subject for notifying that the snack bar has exited from view. */\n  readonly _onExit: Subject<void> = new Subject();\n\n  /** Subject for notifying that the snack bar has finished entering the view. */\n  readonly _onEnter: Subject<void> = new Subject();\n\n  /** The state of the snack bar animations. */\n  _animationState = 'void';\n\n  /** aria-live value for the live region. */\n  _live: AriaLivePoliteness;\n\n  /**\n   * Element that will have the `mdc-snackbar__label` class applied if the attached component\n   * or template does not have it. This ensures that the appropriate structure, typography, and\n   * color is applied to the attached view.\n   */\n  @ViewChild('label', {static: true}) _label: ElementRef;\n\n  /**\n   * Role of the live region. This is only for Firefox as there is a known issue where Firefox +\n   * JAWS does not read out aria-live message.\n   */\n  _role?: 'status' | 'alert';\n\n  /** Unique ID of the aria-live element. */\n  readonly _liveElementId = `mat-snack-bar-container-live-${uniqueId++}`;\n\n  constructor(\n    private _ngZone: NgZone,\n    private _elementRef: ElementRef<HTMLElement>,\n    private _changeDetectorRef: ChangeDetectorRef,\n    private _platform: Platform,\n    /** The snack bar configuration. */\n    public snackBarConfig: MatSnackBarConfig,\n  ) {\n    super();\n\n    // Use aria-live rather than a live role like 'alert' or 'status'\n    // because NVDA and JAWS have show inconsistent behavior with live roles.\n    if (snackBarConfig.politeness === 'assertive' && !snackBarConfig.announcementMessage) {\n      this._live = 'assertive';\n    } else if (snackBarConfig.politeness === 'off') {\n      this._live = 'off';\n    } else {\n      this._live = 'polite';\n    }\n\n    // Only set role for Firefox. Set role based on aria-live because setting role=\"alert\" implies\n    // aria-live=\"assertive\" which may cause issues if aria-live is set to \"polite\" above.\n    if (this._platform.FIREFOX) {\n      if (this._live === 'polite') {\n        this._role = 'status';\n      }\n      if (this._live === 'assertive') {\n        this._role = 'alert';\n      }\n    }\n  }\n\n  /** Attach a component portal as content to this snack bar container. */\n  attachComponentPortal<T>(portal: ComponentPortal<T>): ComponentRef<T> {\n    this._assertNotAttached();\n    const result = this._portalOutlet.attachComponentPortal(portal);\n    this._afterPortalAttached();\n    return result;\n  }\n\n  /** Attach a template portal as content to this snack bar container. */\n  attachTemplatePortal<C>(portal: TemplatePortal<C>): EmbeddedViewRef<C> {\n    this._assertNotAttached();\n    const result = this._portalOutlet.attachTemplatePortal(portal);\n    this._afterPortalAttached();\n    return result;\n  }\n\n  /**\n   * Attaches a DOM portal to the snack bar container.\n   * @deprecated To be turned into a method.\n   * @breaking-change 10.0.0\n   */\n  override attachDomPortal = (portal: DomPortal) => {\n    this._assertNotAttached();\n    const result = this._portalOutlet.attachDomPortal(portal);\n    this._afterPortalAttached();\n    return result;\n  };\n\n  /** Handle end of animations, updating the state of the snackbar. */\n  onAnimationEnd(event: AnimationEvent) {\n    const {fromState, toState} = event;\n\n    if ((toState === 'void' && fromState !== 'void') || toState === 'hidden') {\n      this._completeExit();\n    }\n\n    if (toState === 'visible') {\n      // Note: we shouldn't use `this` inside the zone callback,\n      // because it can cause a memory leak.\n      const onEnter = this._onEnter;\n\n      this._ngZone.run(() => {\n        onEnter.next();\n        onEnter.complete();\n      });\n    }\n  }\n\n  /** Begin animation of snack bar entrance into view. */\n  enter(): void {\n    if (!this._destroyed) {\n      this._animationState = 'visible';\n      // _animationState lives in host bindings and `detectChanges` does not refresh host bindings\n      // so we have to call `markForCheck` to ensure the host view is refreshed eventually.\n      this._changeDetectorRef.markForCheck();\n      this._changeDetectorRef.detectChanges();\n      this._screenReaderAnnounce();\n    }\n  }\n\n  /** Begin animation of the snack bar exiting from view. */\n  exit(): Observable<void> {\n    // It's common for snack bars to be opened by random outside calls like HTTP requests or\n    // errors. Run inside the NgZone to ensure that it functions correctly.\n    this._ngZone.run(() => {\n      // Note: this one transitions to `hidden`, rather than `void`, in order to handle the case\n      // where multiple snack bars are opened in quick succession (e.g. two consecutive calls to\n      // `MatSnackBar.open`).\n      this._animationState = 'hidden';\n      this._changeDetectorRef.markForCheck();\n\n      // Mark this element with an 'exit' attribute to indicate that the snackbar has\n      // been dismissed and will soon be removed from the DOM. This is used by the snackbar\n      // test harness.\n      this._elementRef.nativeElement.setAttribute('mat-exit', '');\n\n      // If the snack bar hasn't been announced by the time it exits it wouldn't have been open\n      // long enough to visually read it either, so clear the timeout for announcing.\n      clearTimeout(this._announceTimeoutId);\n    });\n\n    return this._onExit;\n  }\n\n  /** Makes sure the exit callbacks have been invoked when the element is destroyed. */\n  ngOnDestroy() {\n    this._destroyed = true;\n    this._clearFromModals();\n    this._completeExit();\n  }\n\n  /**\n   * Removes the element in a microtask. Helps prevent errors where we end up\n   * removing an element which is in the middle of an animation.\n   */\n  private _completeExit() {\n    queueMicrotask(() => {\n      this._onExit.next();\n      this._onExit.complete();\n    });\n  }\n\n  /**\n   * Called after the portal contents have been attached. Can be\n   * used to modify the DOM once it's guaranteed to be in place.\n   */\n  private _afterPortalAttached() {\n    const element: HTMLElement = this._elementRef.nativeElement;\n    const panelClasses = this.snackBarConfig.panelClass;\n\n    if (panelClasses) {\n      if (Array.isArray(panelClasses)) {\n        // Note that we can't use a spread here, because IE doesn't support multiple arguments.\n        panelClasses.forEach(cssClass => element.classList.add(cssClass));\n      } else {\n        element.classList.add(panelClasses);\n      }\n    }\n\n    this._exposeToModals();\n\n    // Check to see if the attached component or template uses the MDC template structure,\n    // specifically the MDC label. If not, the container should apply the MDC label class to this\n    // component's label container, which will apply MDC's label styles to the attached view.\n    const label = this._label.nativeElement;\n    const labelClass = 'mdc-snackbar__label';\n    label.classList.toggle(labelClass, !label.querySelector(`.${labelClass}`));\n  }\n\n  /**\n   * Some browsers won't expose the accessibility node of the live element if there is an\n   * `aria-modal` and the live element is outside of it. This method works around the issue by\n   * pointing the `aria-owns` of all modals to the live element.\n   */\n  private _exposeToModals() {\n    // TODO(http://github.com/angular/components/issues/26853): consider de-duplicating this with the\n    // `LiveAnnouncer` and any other usages.\n    //\n    // Note that the selector here is limited to CDK overlays at the moment in order to reduce the\n    // section of the DOM we need to look through. This should cover all the cases we support, but\n    // the selector can be expanded if it turns out to be too narrow.\n    const id = this._liveElementId;\n    const modals = this._document.querySelectorAll(\n      'body > .cdk-overlay-container [aria-modal=\"true\"]',\n    );\n\n    for (let i = 0; i < modals.length; i++) {\n      const modal = modals[i];\n      const ariaOwns = modal.getAttribute('aria-owns');\n      this._trackedModals.add(modal);\n\n      if (!ariaOwns) {\n        modal.setAttribute('aria-owns', id);\n      } else if (ariaOwns.indexOf(id) === -1) {\n        modal.setAttribute('aria-owns', ariaOwns + ' ' + id);\n      }\n    }\n  }\n\n  /** Clears the references to the live element from any modals it was added to. */\n  private _clearFromModals() {\n    this._trackedModals.forEach(modal => {\n      const ariaOwns = modal.getAttribute('aria-owns');\n\n      if (ariaOwns) {\n        const newValue = ariaOwns.replace(this._liveElementId, '').trim();\n\n        if (newValue.length > 0) {\n          modal.setAttribute('aria-owns', newValue);\n        } else {\n          modal.removeAttribute('aria-owns');\n        }\n      }\n    });\n    this._trackedModals.clear();\n  }\n\n  /** Asserts that no content is already attached to the container. */\n  private _assertNotAttached() {\n    if (this._portalOutlet.hasAttached() && (typeof ngDevMode === 'undefined' || ngDevMode)) {\n      throw Error('Attempting to attach snack bar content after content is already attached');\n    }\n  }\n\n  /**\n   * Starts a timeout to move the snack bar content to the live region so screen readers will\n   * announce it.\n   */\n  private _screenReaderAnnounce() {\n    if (!this._announceTimeoutId) {\n      this._ngZone.runOutsideAngular(() => {\n        this._announceTimeoutId = setTimeout(() => {\n          const inertElement = this._elementRef.nativeElement.querySelector('[aria-hidden]');\n          const liveElement = this._elementRef.nativeElement.querySelector('[aria-live]');\n\n          if (inertElement && liveElement) {\n            // If an element in the snack bar content is focused before being moved\n            // track it and restore focus after moving to the live region.\n            let focusedElement: HTMLElement | null = null;\n            if (\n              this._platform.isBrowser &&\n              document.activeElement instanceof HTMLElement &&\n              inertElement.contains(document.activeElement)\n            ) {\n              focusedElement = document.activeElement;\n            }\n\n            inertElement.removeAttribute('aria-hidden');\n            liveElement.appendChild(inertElement);\n            focusedElement?.focus();\n\n            this._onAnnounce.n