@angular/material
Version:
Angular Material
214 lines • 30.4 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 { 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';
}
}
/** 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: "<!-- Initialy holds the snack bar content, will be empty after announcing to screen readers. -->\n<div aria-hidden=\"true\">\n <ng-template cdkPortalOutlet></ng-template>\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\"></div>\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  _onAnnounce: Subject<any>;\n  _onExit: Subject<any>;\n  _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: 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  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\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  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"]}