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dialog.ts
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dialog.ts
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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 {Directionality} from '@angular/cdk/bidi';
import {
Overlay,
OverlayConfig,
OverlayContainer,
OverlayRef,
ScrollStrategy,
} from '@angular/cdk/overlay';
import {ComponentPortal, ComponentType, PortalInjector, TemplatePortal} from '@angular/cdk/portal';
import {Location} from '@angular/common';
import {
Inject,
Injectable,
InjectionToken,
Injector,
OnDestroy,
Optional,
SkipSelf,
TemplateRef,
} from '@angular/core';
import {defer, Observable, of as observableOf, Subject} from 'rxjs';
import {startWith} from 'rxjs/operators';
import {MatDialogConfig} from './dialog-config';
import {MatDialogContainer} from './dialog-container';
import {MatDialogRef} from './dialog-ref';
/** Injection token that can be used to access the data that was passed in to a dialog. */
export const MAT_DIALOG_DATA = new InjectionToken<any>('MatDialogData');
/** Injection token that can be used to specify default dialog options. */
export const MAT_DIALOG_DEFAULT_OPTIONS =
new InjectionToken<MatDialogConfig>('mat-dialog-default-options');
/** Injection token that determines the scroll handling while the dialog is open. */
export const MAT_DIALOG_SCROLL_STRATEGY =
new InjectionToken<() => ScrollStrategy>('mat-dialog-scroll-strategy');
/** @docs-private */
export function MAT_DIALOG_SCROLL_STRATEGY_FACTORY(overlay: Overlay): () => ScrollStrategy {
return () => overlay.scrollStrategies.block();
}
/** @docs-private */
export function MAT_DIALOG_SCROLL_STRATEGY_PROVIDER_FACTORY(overlay: Overlay):
() => ScrollStrategy {
return () => overlay.scrollStrategies.block();
}
/** @docs-private */
export const MAT_DIALOG_SCROLL_STRATEGY_PROVIDER = {
provide: MAT_DIALOG_SCROLL_STRATEGY,
deps: [Overlay],
useFactory: MAT_DIALOG_SCROLL_STRATEGY_PROVIDER_FACTORY,
};
/**
* Service to open Material Design modal dialogs.
*/
@Injectable()
export class MatDialog implements OnDestroy {
private _openDialogsAtThisLevel: MatDialogRef<any>[] = [];
private readonly _afterAllClosedAtThisLevel = new Subject<void>();
private readonly _afterOpenedAtThisLevel = new Subject<MatDialogRef<any>>();
private _ariaHiddenElements = new Map<Element, string|null>();
private _scrollStrategy: () => ScrollStrategy;
/** Keeps track of the currently-open dialogs. */
get openDialogs(): MatDialogRef<any>[] {
return this._parentDialog ? this._parentDialog.openDialogs : this._openDialogsAtThisLevel;
}
/** Stream that emits when a dialog has been opened. */
get afterOpened(): Subject<MatDialogRef<any>> {
return this._parentDialog ? this._parentDialog.afterOpened : this._afterOpenedAtThisLevel;
}
/**
* Stream that emits when a dialog has been opened.
* @deprecated Use `afterOpened` instead.
* @breaking-change 8.0.0
*/
get afterOpen(): Subject<MatDialogRef<any>> {
return this.afterOpened;
}
get _afterAllClosed(): Subject<void> {
const parent = this._parentDialog;
return parent ? parent._afterAllClosed : this._afterAllClosedAtThisLevel;
}
/**
* Stream that emits when all open dialog have finished closing.
* Will emit on subscribe if there are no open dialogs to begin with.
*/
readonly afterAllClosed: Observable<void> = defer<void>(() => this.openDialogs.length ?
this._afterAllClosed :
this._afterAllClosed.pipe(startWith(undefined)));
constructor(
private _overlay: Overlay,
private _injector: Injector,
@Optional() private _location: Location,
@Optional() @Inject(MAT_DIALOG_DEFAULT_OPTIONS) private _defaultOptions: MatDialogConfig,
@Inject(MAT_DIALOG_SCROLL_STRATEGY) scrollStrategy: any,
@Optional() @SkipSelf() private _parentDialog: MatDialog,
private _overlayContainer: OverlayContainer) {
this._scrollStrategy = scrollStrategy;
}
/**
* Opens a modal dialog containing the given component.
* @param componentOrTemplateRef Type of the component to load into the dialog,
* or a TemplateRef to instantiate as the dialog content.
* @param config Extra configuration options.
* @returns Reference to the newly-opened dialog.
*/
open<T, D = any, R = any>(componentOrTemplateRef: ComponentType<T> | TemplateRef<T>,
config?: MatDialogConfig<D>): MatDialogRef<T, R> {
config = _applyConfigDefaults(config, this._defaultOptions || new MatDialogConfig());
if (config.id && this.getDialogById(config.id)) {
throw Error(`Dialog with id "${config.id}" exists already. The dialog id must be unique.`);
}
const overlayRef = this._createOverlay(config);
const dialogContainer = this._attachDialogContainer(overlayRef, config);
const dialogRef = this._attachDialogContent<T, R>(componentOrTemplateRef,
dialogContainer,
overlayRef,
config);
// If this is the first dialog that we're opening, hide all the non-overlay content.
if (!this.openDialogs.length) {
this._hideNonDialogContentFromAssistiveTechnology();
}
this.openDialogs.push(dialogRef);
dialogRef.afterClosed().subscribe(() => this._removeOpenDialog(dialogRef));
this.afterOpened.next(dialogRef);
return dialogRef;
}
/**
* Closes all of the currently-open dialogs.
*/
closeAll(): void {
this._closeDialogs(this.openDialogs);
}
/**
* Finds an open dialog by its id.
* @param id ID to use when looking up the dialog.
*/
getDialogById(id: string): MatDialogRef<any> | undefined {
return this.openDialogs.find(dialog => dialog.id === id);
}
ngOnDestroy() {
// Only close the dialogs at this level on destroy
// since the parent service may still be active.
this._closeDialogs(this._openDialogsAtThisLevel);
}
/**
* Creates the overlay into which the dialog will be loaded.
* @param config The dialog configuration.
* @returns A promise resolving to the OverlayRef for the created overlay.
*/
private _createOverlay(config: MatDialogConfig): OverlayRef {
const overlayConfig = this._getOverlayConfig(config);
return this._overlay.create(overlayConfig);
}
/**
* Creates an overlay config from a dialog config.
* @param dialogConfig The dialog configuration.
* @returns The overlay configuration.
*/
private _getOverlayConfig(dialogConfig: MatDialogConfig): OverlayConfig {
const state = new OverlayConfig({
positionStrategy: this._overlay.position().global(),
scrollStrategy: dialogConfig.scrollStrategy || this._scrollStrategy(),
panelClass: dialogConfig.panelClass,
hasBackdrop: dialogConfig.hasBackdrop,
direction: dialogConfig.direction,
minWidth: dialogConfig.minWidth,
minHeight: dialogConfig.minHeight,
maxWidth: dialogConfig.maxWidth,
maxHeight: dialogConfig.maxHeight,
disposeOnNavigation: dialogConfig.closeOnNavigation
});
if (dialogConfig.backdropClass) {
state.backdropClass = dialogConfig.backdropClass;
}
return state;
}
/**
* Attaches an MatDialogContainer to a dialog's already-created overlay.
* @param overlay Reference to the dialog's underlying overlay.
* @param config The dialog configuration.
* @returns A promise resolving to a ComponentRef for the attached container.
*/
private _attachDialogContainer(overlay: OverlayRef, config: MatDialogConfig): MatDialogContainer {
const userInjector = config && config.viewContainerRef && config.viewContainerRef.injector;
const injector = new PortalInjector(userInjector || this._injector, new WeakMap([
[MatDialogConfig, config]
]));
const containerPortal =
new ComponentPortal(MatDialogContainer, config.viewContainerRef, injector);
const containerRef = overlay.attach<MatDialogContainer>(containerPortal);
return containerRef.instance;
}
/**
* Attaches the user-provided component to the already-created MatDialogContainer.
* @param componentOrTemplateRef The type of component being loaded into the dialog,
* or a TemplateRef to instantiate as the content.
* @param dialogContainer Reference to the wrapping MatDialogContainer.
* @param overlayRef Reference to the overlay in which the dialog resides.
* @param config The dialog configuration.
* @returns A promise resolving to the MatDialogRef that should be returned to the user.
*/
private _attachDialogContent<T, R>(
componentOrTemplateRef: ComponentType<T> | TemplateRef<T>,
dialogContainer: MatDialogContainer,
overlayRef: OverlayRef,
config: MatDialogConfig): MatDialogRef<T, R> {
// Create a reference to the dialog we're creating in order to give the user a handle
// to modify and close it.
const dialogRef =
new MatDialogRef<T, R>(overlayRef, dialogContainer, this._location, config.id);
// When the dialog backdrop is clicked, we want to close it.
if (config.hasBackdrop) {
overlayRef.backdropClick().subscribe(() => {
if (!dialogRef.disableClose) {
dialogRef.close();
}
});
}
if (componentOrTemplateRef instanceof TemplateRef) {
dialogContainer.attachTemplatePortal(
new TemplatePortal<T>(componentOrTemplateRef, null!,
<any>{ $implicit: config.data, dialogRef }));
} else {
const injector = this._createInjector<T>(config, dialogRef, dialogContainer);
const contentRef = dialogContainer.attachComponentPortal<T>(
new ComponentPortal(componentOrTemplateRef, undefined, injector));
dialogRef.componentInstance = contentRef.instance;
}
dialogRef
.updateSize(config.width, config.height)
.updatePosition(config.position);
return dialogRef;
}
/**
* Creates a custom injector to be used inside the dialog. This allows a component loaded inside
* of a dialog to close itself and, optionally, to return a value.
* @param config Config object that is used to construct the dialog.
* @param dialogRef Reference to the dialog.
* @param container Dialog container element that wraps all of the contents.
* @returns The custom injector that can be used inside the dialog.
*/
private _createInjector<T>(
config: MatDialogConfig,
dialogRef: MatDialogRef<T>,
dialogContainer: MatDialogContainer): PortalInjector {
const userInjector = config && config.viewContainerRef && config.viewContainerRef.injector;
// The MatDialogContainer is injected in the portal as the MatDialogContainer and the dialog's
// content are created out of the same ViewContainerRef and as such, are siblings for injector
// purposes. To allow the hierarchy that is expected, the MatDialogContainer is explicitly
// added to the injection tokens.
const injectionTokens = new WeakMap<any, any>([
[MatDialogContainer, dialogContainer],
[MAT_DIALOG_DATA, config.data],
[MatDialogRef, dialogRef]
]);
if (config.direction &&
(!userInjector || !userInjector.get<Directionality | null>(Directionality, null))) {
injectionTokens.set(Directionality, {
value: config.direction,
change: observableOf()
});
}
return new PortalInjector(userInjector || this._injector, injectionTokens);
}
/**
* Removes a dialog from the array of open dialogs.
* @param dialogRef Dialog to be removed.
*/
private _removeOpenDialog(dialogRef: MatDialogRef<any>) {
const index = this.openDialogs.indexOf(dialogRef);
if (index > -1) {
this.openDialogs.splice(index, 1);
// If all the dialogs were closed, remove/restore the `aria-hidden`
// to a the siblings and emit to the `afterAllClosed` stream.
if (!this.openDialogs.length) {
this._ariaHiddenElements.forEach((previousValue, element) => {
if (previousValue) {
element.setAttribute('aria-hidden', previousValue);
} else {
element.removeAttribute('aria-hidden');
}
});
this._ariaHiddenElements.clear();
this._afterAllClosed.next();
}
}
}
/**
* Hides all of the content that isn't an overlay from assistive technology.
*/
private _hideNonDialogContentFromAssistiveTechnology() {
const overlayContainer = this._overlayContainer.getContainerElement();
// Ensure that the overlay container is attached to the DOM.
if (overlayContainer.parentElement) {
const siblings = overlayContainer.parentElement.children;
for (let i = siblings.length - 1; i > -1; i--) {
let sibling = siblings[i];
if (sibling !== overlayContainer &&
sibling.nodeName !== 'SCRIPT' &&
sibling.nodeName !== 'STYLE' &&
!sibling.hasAttribute('aria-live')) {
this._ariaHiddenElements.set(sibling, sibling.getAttribute('aria-hidden'));
sibling.setAttribute('aria-hidden', 'true');
}
}
}
}
/** Closes all of the dialogs in an array. */
private _closeDialogs(dialogs: MatDialogRef<any>[]) {
let i = dialogs.length;
while (i--) {
// The `_openDialogs` property isn't updated after close until the rxjs subscription
// runs on the next microtask, in addition to modifying the array as we're going
// through it. We loop through all of them and call close without assuming that
// they'll be removed from the list instantaneously.
dialogs[i].close();
}
}
}
/**
* Applies default options to the dialog config.
* @param config Config to be modified.
* @param defaultOptions Default options provided.
* @returns The new configuration object.
*/
function _applyConfigDefaults(
config?: MatDialogConfig, defaultOptions?: MatDialogConfig): MatDialogConfig {
return {...defaultOptions, ...config};
}