/** * @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 { Platform } from '@angular/cdk/platform'; import { BasePortalOutlet, CdkPortalOutlet, } from '@angular/cdk/portal'; import { ChangeDetectionStrategy, ChangeDetectorRef, Component, ElementRef, NgZone, ViewChild, ViewEncapsulation, } from '@angular/core'; import { Subject } from 'rxjs'; import { take } from 'rxjs/operators'; import { matSnackBarAnimations } from './snack-bar-animations'; import { MatSnackBarConfig } from './snack-bar-config'; /** * 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; /** 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'; /** * 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(); this._applySnackBarClasses(); return this._portalOutlet.attachDomPortal(portal); }; // 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(); this._applySnackBarClasses(); return this._portalOutlet.attachComponentPortal(portal); } /** Attach a template portal as content to this snack bar container. */ attachTemplatePortal(portal) { this._assertNotAttached(); this._applySnackBarClasses(); return this._portalOutlet.attachTemplatePortal(portal); } /** 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'; this._changeDetectorRef.detectChanges(); this._screenReaderAnnounce(); } } /** Begin animation of the snack bar exiting from view. */ exit() { // 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'; // 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._completeExit(); } /** * Waits for the zone to settle before removing the element. Helps prevent * errors where we end up removing an element which is in the middle of an animation. */ _completeExit() { this._ngZone.onMicrotaskEmpty.pipe(take(1)).subscribe(() => { this._onExit.next(); this._onExit.complete(); }); } /** Applies the various positioning and user-configured CSS classes to the snack bar. */ _applySnackBarClasses() { 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); } } if (this.snackBarConfig.horizontalPosition === 'center') { element.classList.add('mat-snack-bar-center'); } if (this.snackBarConfig.verticalPosition === 'top') { element.classList.add('mat-snack-bar-top'); } } /** 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 === null || focusedElement === void 0 ? void 0 : focusedElement.focus(); this._onAnnounce.next(); this._onAnnounce.complete(); } }, this._announceDelay); }); } } } MatSnackBarContainer.decorators = [ { type: Component, args: [{ selector: 'snack-bar-container', template: "\n
\n \n
\n\n\n
\n", // In Ivy embedded views will be change detected from their declaration place, rather than // where they were stamped out. This means that we can't have the snack bar container be OnPush, // because it might cause snack bars that were opened from a template not to be out of date. // tslint:disable-next-line:validate-decorators changeDetection: ChangeDetectionStrategy.Default, encapsulation: ViewEncapsulation.None, animations: [matSnackBarAnimations.snackBarState], host: { 'class': 'mat-snack-bar-container', '[@state]': '_animationState', '(@state.done)': 'onAnimationEnd($event)' }, styles: [".mat-snack-bar-container{border-radius:4px;box-sizing:border-box;display:block;margin:24px;max-width:33vw;min-width:344px;padding:14px 16px;min-height:48px;transform-origin:center}.cdk-high-contrast-active .mat-snack-bar-container{border:solid 1px}.mat-snack-bar-handset{width:100%}.mat-snack-bar-handset .mat-snack-bar-container{margin:8px;max-width:100%;min-width:0;width:100%}\n"] },] } ]; MatSnackBarContainer.ctorParameters = () => [ { type: NgZone }, { type: ElementRef }, { type: ChangeDetectorRef }, { type: Platform }, { type: MatSnackBarConfig } ]; MatSnackBarContainer.propDecorators = { _portalOutlet: [{ type: ViewChild, args: [CdkPortalOutlet, { 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 {AnimationEvent} from '@angular/animations';\nimport {AriaLivePoliteness} from '@angular/cdk/a11y';\nimport {Platform} from '@angular/cdk/platform';\nimport {\n  BasePortalOutlet,\n  CdkPortalOutlet,\n  ComponentPortal,\n  TemplatePortal,\n  DomPortal,\n} from '@angular/cdk/portal';\nimport {\n  ChangeDetectionStrategy,\n  ChangeDetectorRef,\n  Component,\n  ComponentRef,\n  ElementRef,\n  EmbeddedViewRef,\n  NgZone,\n  OnDestroy,\n  ViewChild,\n  ViewEncapsulation,\n} from '@angular/core';\nimport {Observable, Subject} from 'rxjs';\nimport {take} from 'rxjs/operators';\nimport {matSnackBarAnimations} from './snack-bar-animations';\nimport {MatSnackBarConfig} from './snack-bar-config';\n\n/**\n * Internal interface for a snack bar container.\n * @docs-private\n */\nexport interface _SnackBarContainer {\n  snackBarConfig: MatSnackBarConfig;\n  readonly _onAnnounce: Subject<any>;\n  readonly _onExit: Subject<any>;\n  readonly _onEnter: Subject<any>;\n  enter: () => void;\n  exit: () => Observable<void>;\n  attachTemplatePortal: <C>(portal: TemplatePortal<C>) => EmbeddedViewRef<C>;\n  attachComponentPortal: <T>(portal: ComponentPortal<T>) => ComponentRef<T>;\n}\n\n/**\n * Internal component that wraps user-provided snack bar content.\n * @docs-private\n */\n@Component({\n  selector: 'snack-bar-container',\n  templateUrl: 'snack-bar-container.html',\n  styleUrls: ['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  host: {\n    'class': 'mat-snack-bar-container',\n    '[@state]': '_animationState',\n    '(@state.done)': 'onAnimationEnd($event)'\n  },\n})\nexport class MatSnackBarContainer extends BasePortalOutlet\n    implements OnDestroy, _SnackBarContainer {\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: any;\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   * 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  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    this._applySnackBarClasses();\n    return this._portalOutlet.attachComponentPortal(portal);\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    this._applySnackBarClasses();\n    return this._portalOutlet.attachTemplatePortal(portal);\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    this._applySnackBarClasses();\n    return this._portalOutlet.attachDomPortal(portal);\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      this._changeDetectorRef.detectChanges();\n      this._screenReaderAnnounce();\n    }\n  }\n\n  /** Begin animation of the snack bar exiting from view. */\n  exit(): Observable<void> {\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\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    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._completeExit();\n  }\n\n  /**\n   * Waits for the zone to settle before removing the element. Helps prevent\n   * errors where we end up removing an element which is in the middle of an animation.\n   */\n  private _completeExit() {\n    this._ngZone.onMicrotaskEmpty.pipe(take(1)).subscribe(() => {\n      this._onExit.next();\n      this._onExit.complete();\n    });\n  }\n\n  /** Applies the various positioning and user-configured CSS classes to the snack bar. */\n  private _applySnackBarClasses() {\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    if (this.snackBarConfig.horizontalPosition === 'center') {\n      element.classList.add('mat-snack-bar-center');\n    }\n\n    if (this.snackBarConfig.verticalPosition === 'top') {\n      element.classList.add('mat-snack-bar-top');\n    }\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 (this._platform.isBrowser &&\n                document.activeElement instanceof HTMLElement &&\n                inertElement.contains(document.activeElement)) {\n              focusedElement = document.activeElement;\n            }\n\n            inertElement.removeAttribute('aria-hidden');\n            liveElement.appendChild(inertElement);\n            focusedElement?.focus();\n\n            this._onAnnounce.next();\n            this._onAnnounce.complete();\n          }\n        }, this._announceDelay);\n      });\n    }\n  }\n}\n"]}