@angular/cdk
Version:
Angular Material Component Development Kit
427 lines • 60.5 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 { Subject, merge, Subscription } from 'rxjs';
import { take, takeUntil } from 'rxjs/operators';
import { coerceCssPixelValue, coerceArray } from '@angular/cdk/coercion';
/**
* Reference to an overlay that has been created with the Overlay service.
* Used to manipulate or dispose of said overlay.
*/
export class OverlayRef {
constructor(_portalOutlet, _host, _pane, _config, _ngZone, _keyboardDispatcher, _document, _location, _outsideClickDispatcher, _animationsDisabled = false) {
this._portalOutlet = _portalOutlet;
this._host = _host;
this._pane = _pane;
this._config = _config;
this._ngZone = _ngZone;
this._keyboardDispatcher = _keyboardDispatcher;
this._document = _document;
this._location = _location;
this._outsideClickDispatcher = _outsideClickDispatcher;
this._animationsDisabled = _animationsDisabled;
this._backdropElement = null;
this._backdropClick = new Subject();
this._attachments = new Subject();
this._detachments = new Subject();
this._locationChanges = Subscription.EMPTY;
this._backdropClickHandler = (event) => this._backdropClick.next(event);
this._backdropTransitionendHandler = (event) => {
this._disposeBackdrop(event.target);
};
/** Stream of keydown events dispatched to this overlay. */
this._keydownEvents = new Subject();
/** Stream of mouse outside events dispatched to this overlay. */
this._outsidePointerEvents = new Subject();
if (_config.scrollStrategy) {
this._scrollStrategy = _config.scrollStrategy;
this._scrollStrategy.attach(this);
}
this._positionStrategy = _config.positionStrategy;
}
/** The overlay's HTML element */
get overlayElement() {
return this._pane;
}
/** The overlay's backdrop HTML element. */
get backdropElement() {
return this._backdropElement;
}
/**
* Wrapper around the panel element. Can be used for advanced
* positioning where a wrapper with specific styling is
* required around the overlay pane.
*/
get hostElement() {
return this._host;
}
/**
* Attaches content, given via a Portal, to the overlay.
* If the overlay is configured to have a backdrop, it will be created.
*
* @param portal Portal instance to which to attach the overlay.
* @returns The portal attachment result.
*/
attach(portal) {
// Insert the host into the DOM before attaching the portal, otherwise
// the animations module will skip animations on repeat attachments.
if (!this._host.parentElement && this._previousHostParent) {
this._previousHostParent.appendChild(this._host);
}
const attachResult = this._portalOutlet.attach(portal);
if (this._positionStrategy) {
this._positionStrategy.attach(this);
}
this._updateStackingOrder();
this._updateElementSize();
this._updateElementDirection();
if (this._scrollStrategy) {
this._scrollStrategy.enable();
}
// Update the position once the zone is stable so that the overlay will be fully rendered
// before attempting to position it, as the position may depend on the size of the rendered
// content.
this._ngZone.onStable.pipe(take(1)).subscribe(() => {
// The overlay could've been detached before the zone has stabilized.
if (this.hasAttached()) {
this.updatePosition();
}
});
// Enable pointer events for the overlay pane element.
this._togglePointerEvents(true);
if (this._config.hasBackdrop) {
this._attachBackdrop();
}
if (this._config.panelClass) {
this._toggleClasses(this._pane, this._config.panelClass, true);
}
// Only emit the `attachments` event once all other setup is done.
this._attachments.next();
// Track this overlay by the keyboard dispatcher
this._keyboardDispatcher.add(this);
if (this._config.disposeOnNavigation) {
this._locationChanges = this._location.subscribe(() => this.dispose());
}
this._outsideClickDispatcher.add(this);
// TODO(crisbeto): the null check is here, because the portal outlet returns `any`.
// We should be guaranteed for the result to be `ComponentRef | EmbeddedViewRef`, but
// `instanceof EmbeddedViewRef` doesn't appear to work at the moment.
if (typeof attachResult?.onDestroy === 'function') {
// In most cases we control the portal and we know when it is being detached so that
// we can finish the disposal process. The exception is if the user passes in a custom
// `ViewContainerRef` that isn't destroyed through the overlay API. Note that we use
// `detach` here instead of `dispose`, because we don't know if the user intends to
// reattach the overlay at a later point. It also has the advantage of waiting for animations.
attachResult.onDestroy(() => {
if (this.hasAttached()) {
// We have to delay the `detach` call, because detaching immediately prevents
// other destroy hooks from running. This is likely a framework bug similar to
// https://github.com/angular/angular/issues/46119
this._ngZone.runOutsideAngular(() => Promise.resolve().then(() => this.detach()));
}
});
}
return attachResult;
}
/**
* Detaches an overlay from a portal.
* @returns The portal detachment result.
*/
detach() {
if (!this.hasAttached()) {
return;
}
this.detachBackdrop();
// When the overlay is detached, the pane element should disable pointer events.
// This is necessary because otherwise the pane element will cover the page and disable
// pointer events therefore. Depends on the position strategy and the applied pane boundaries.
this._togglePointerEvents(false);
if (this._positionStrategy && this._positionStrategy.detach) {
this._positionStrategy.detach();
}
if (this._scrollStrategy) {
this._scrollStrategy.disable();
}
const detachmentResult = this._portalOutlet.detach();
// Only emit after everything is detached.
this._detachments.next();
// Remove this overlay from keyboard dispatcher tracking.
this._keyboardDispatcher.remove(this);
// Keeping the host element in the DOM can cause scroll jank, because it still gets
// rendered, even though it's transparent and unclickable which is why we remove it.
this._detachContentWhenStable();
this._locationChanges.unsubscribe();
this._outsideClickDispatcher.remove(this);
return detachmentResult;
}
/** Cleans up the overlay from the DOM. */
dispose() {
const isAttached = this.hasAttached();
if (this._positionStrategy) {
this._positionStrategy.dispose();
}
this._disposeScrollStrategy();
this._disposeBackdrop(this._backdropElement);
this._locationChanges.unsubscribe();
this._keyboardDispatcher.remove(this);
this._portalOutlet.dispose();
this._attachments.complete();
this._backdropClick.complete();
this._keydownEvents.complete();
this._outsidePointerEvents.complete();
this._outsideClickDispatcher.remove(this);
this._host?.remove();
this._previousHostParent = this._pane = this._host = null;
if (isAttached) {
this._detachments.next();
}
this._detachments.complete();
}
/** Whether the overlay has attached content. */
hasAttached() {
return this._portalOutlet.hasAttached();
}
/** Gets an observable that emits when the backdrop has been clicked. */
backdropClick() {
return this._backdropClick;
}
/** Gets an observable that emits when the overlay has been attached. */
attachments() {
return this._attachments;
}
/** Gets an observable that emits when the overlay has been detached. */
detachments() {
return this._detachments;
}
/** Gets an observable of keydown events targeted to this overlay. */
keydownEvents() {
return this._keydownEvents;
}
/** Gets an observable of pointer events targeted outside this overlay. */
outsidePointerEvents() {
return this._outsidePointerEvents;
}
/** Gets the current overlay configuration, which is immutable. */
getConfig() {
return this._config;
}
/** Updates the position of the overlay based on the position strategy. */
updatePosition() {
if (this._positionStrategy) {
this._positionStrategy.apply();
}
}
/** Switches to a new position strategy and updates the overlay position. */
updatePositionStrategy(strategy) {
if (strategy === this._positionStrategy) {
return;
}
if (this._positionStrategy) {
this._positionStrategy.dispose();
}
this._positionStrategy = strategy;
if (this.hasAttached()) {
strategy.attach(this);
this.updatePosition();
}
}
/** Update the size properties of the overlay. */
updateSize(sizeConfig) {
this._config = { ...this._config, ...sizeConfig };
this._updateElementSize();
}
/** Sets the LTR/RTL direction for the overlay. */
setDirection(dir) {
this._config = { ...this._config, direction: dir };
this._updateElementDirection();
}
/** Add a CSS class or an array of classes to the overlay pane. */
addPanelClass(classes) {
if (this._pane) {
this._toggleClasses(this._pane, classes, true);
}
}
/** Remove a CSS class or an array of classes from the overlay pane. */
removePanelClass(classes) {
if (this._pane) {
this._toggleClasses(this._pane, classes, false);
}
}
/**
* Returns the layout direction of the overlay panel.
*/
getDirection() {
const direction = this._config.direction;
if (!direction) {
return 'ltr';
}
return typeof direction === 'string' ? direction : direction.value;
}
/** Switches to a new scroll strategy. */
updateScrollStrategy(strategy) {
if (strategy === this._scrollStrategy) {
return;
}
this._disposeScrollStrategy();
this._scrollStrategy = strategy;
if (this.hasAttached()) {
strategy.attach(this);
strategy.enable();
}
}
/** Updates the text direction of the overlay panel. */
_updateElementDirection() {
this._host.setAttribute('dir', this.getDirection());
}
/** Updates the size of the overlay element based on the overlay config. */
_updateElementSize() {
if (!this._pane) {
return;
}
const style = this._pane.style;
style.width = coerceCssPixelValue(this._config.width);
style.height = coerceCssPixelValue(this._config.height);
style.minWidth = coerceCssPixelValue(this._config.minWidth);
style.minHeight = coerceCssPixelValue(this._config.minHeight);
style.maxWidth = coerceCssPixelValue(this._config.maxWidth);
style.maxHeight = coerceCssPixelValue(this._config.maxHeight);
}
/** Toggles the pointer events for the overlay pane element. */
_togglePointerEvents(enablePointer) {
this._pane.style.pointerEvents = enablePointer ? '' : 'none';
}
/** Attaches a backdrop for this overlay. */
_attachBackdrop() {
const showingClass = 'cdk-overlay-backdrop-showing';
this._backdropElement = this._document.createElement('div');
this._backdropElement.classList.add('cdk-overlay-backdrop');
if (this._animationsDisabled) {
this._backdropElement.classList.add('cdk-overlay-backdrop-noop-animation');
}
if (this._config.backdropClass) {
this._toggleClasses(this._backdropElement, this._config.backdropClass, true);
}
// Insert the backdrop before the pane in the DOM order,
// in order to handle stacked overlays properly.
this._host.parentElement.insertBefore(this._backdropElement, this._host);
// Forward backdrop clicks such that the consumer of the overlay can perform whatever
// action desired when such a click occurs (usually closing the overlay).
this._backdropElement.addEventListener('click', this._backdropClickHandler);
// Add class to fade-in the backdrop after one frame.
if (!this._animationsDisabled && typeof requestAnimationFrame !== 'undefined') {
this._ngZone.runOutsideAngular(() => {
requestAnimationFrame(() => {
if (this._backdropElement) {
this._backdropElement.classList.add(showingClass);
}
});
});
}
else {
this._backdropElement.classList.add(showingClass);
}
}
/**
* Updates the stacking order of the element, moving it to the top if necessary.
* This is required in cases where one overlay was detached, while another one,
* that should be behind it, was destroyed. The next time both of them are opened,
* the stacking will be wrong, because the detached element's pane will still be
* in its original DOM position.
*/
_updateStackingOrder() {
if (this._host.nextSibling) {
this._host.parentNode.appendChild(this._host);
}
}
/** Detaches the backdrop (if any) associated with the overlay. */
detachBackdrop() {
const backdropToDetach = this._backdropElement;
if (!backdropToDetach) {
return;
}
if (this._animationsDisabled) {
this._disposeBackdrop(backdropToDetach);
return;
}
backdropToDetach.classList.remove('cdk-overlay-backdrop-showing');
this._ngZone.runOutsideAngular(() => {
backdropToDetach.addEventListener('transitionend', this._backdropTransitionendHandler);
});
// If the backdrop doesn't have a transition, the `transitionend` event won't fire.
// In this case we make it unclickable and we try to remove it after a delay.
backdropToDetach.style.pointerEvents = 'none';
// Run this outside the Angular zone because there's nothing that Angular cares about.
// If it were to run inside the Angular zone, every test that used Overlay would have to be
// either async or fakeAsync.
this._backdropTimeout = this._ngZone.runOutsideAngular(() => setTimeout(() => {
this._disposeBackdrop(backdropToDetach);
}, 500));
}
/** Toggles a single CSS class or an array of classes on an element. */
_toggleClasses(element, cssClasses, isAdd) {
const classes = coerceArray(cssClasses || []).filter(c => !!c);
if (classes.length) {
isAdd ? element.classList.add(...classes) : element.classList.remove(...classes);
}
}
/** Detaches the overlay content next time the zone stabilizes. */
_detachContentWhenStable() {
// Normally we wouldn't have to explicitly run this outside the `NgZone`, however
// if the consumer is using `zone-patch-rxjs`, the `Subscription.unsubscribe` call will
// be patched to run inside the zone, which will throw us into an infinite loop.
this._ngZone.runOutsideAngular(() => {
// We can't remove the host here immediately, because the overlay pane's content
// might still be animating. This stream helps us avoid interrupting the animation
// by waiting for the pane to become empty.
const subscription = this._ngZone.onStable
.pipe(takeUntil(merge(this._attachments, this._detachments)))
.subscribe(() => {
// Needs a couple of checks for the pane and host, because
// they may have been removed by the time the zone stabilizes.
if (!this._pane || !this._host || this._pane.children.length === 0) {
if (this._pane && this._config.panelClass) {
this._toggleClasses(this._pane, this._config.panelClass, false);
}
if (this._host && this._host.parentElement) {
this._previousHostParent = this._host.parentElement;
this._host.remove();
}
subscription.unsubscribe();
}
});
});
}
/** Disposes of a scroll strategy. */
_disposeScrollStrategy() {
const scrollStrategy = this._scrollStrategy;
if (scrollStrategy) {
scrollStrategy.disable();
if (scrollStrategy.detach) {
scrollStrategy.detach();
}
}
}
/** Removes a backdrop element from the DOM. */
_disposeBackdrop(backdrop) {
if (backdrop) {
backdrop.removeEventListener('click', this._backdropClickHandler);
backdrop.removeEventListener('transitionend', this._backdropTransitionendHandler);
backdrop.remove();
// It is possible that a new portal has been attached to this overlay since we started
// removing the backdrop. If that is the case, only clear the backdrop reference if it
// is still the same instance that we started to remove.
if (this._backdropElement === backdrop) {
this._backdropElement = null;
}
}
if (this._backdropTimeout) {
clearTimeout(this._backdropTimeout);
this._backdropTimeout = undefined;
}
}
}
//# 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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 {Direction, Directionality} from '@angular/cdk/bidi';\nimport {ComponentPortal, Portal, PortalOutlet, TemplatePortal} from '@angular/cdk/portal';\nimport {ComponentRef, EmbeddedViewRef, NgZone} from '@angular/core';\nimport {Location} from '@angular/common';\nimport {Observable, Subject, merge, SubscriptionLike, Subscription} from 'rxjs';\nimport {take, takeUntil} from 'rxjs/operators';\nimport {OverlayKeyboardDispatcher} from './dispatchers/overlay-keyboard-dispatcher';\nimport {OverlayOutsideClickDispatcher} from './dispatchers/overlay-outside-click-dispatcher';\nimport {OverlayConfig} from './overlay-config';\nimport {coerceCssPixelValue, coerceArray} from '@angular/cdk/coercion';\nimport {PositionStrategy} from './position/position-strategy';\nimport {ScrollStrategy} from './scroll';\n\n/** An object where all of its properties cannot be written. */\nexport type ImmutableObject<T> = {\n  readonly [P in keyof T]: T[P];\n};\n\n/**\n * Reference to an overlay that has been created with the Overlay service.\n * Used to manipulate or dispose of said overlay.\n */\nexport class OverlayRef implements PortalOutlet {\n  private _backdropElement: HTMLElement | null = null;\n  private _backdropTimeout: number | undefined;\n  private readonly _backdropClick = new Subject<MouseEvent>();\n  private readonly _attachments = new Subject<void>();\n  private readonly _detachments = new Subject<void>();\n  private _positionStrategy: PositionStrategy | undefined;\n  private _scrollStrategy: ScrollStrategy | undefined;\n  private _locationChanges: SubscriptionLike = Subscription.EMPTY;\n  private _backdropClickHandler = (event: MouseEvent) => this._backdropClick.next(event);\n  private _backdropTransitionendHandler = (event: TransitionEvent) => {\n    this._disposeBackdrop(event.target as HTMLElement | null);\n  };\n\n  /**\n   * Reference to the parent of the `_host` at the time it was detached. Used to restore\n   * the `_host` to its original position in the DOM when it gets re-attached.\n   */\n  private _previousHostParent: HTMLElement;\n\n  /** Stream of keydown events dispatched to this overlay. */\n  readonly _keydownEvents = new Subject<KeyboardEvent>();\n\n  /** Stream of mouse outside events dispatched to this overlay. */\n  readonly _outsidePointerEvents = new Subject<MouseEvent>();\n\n  constructor(\n    private _portalOutlet: PortalOutlet,\n    private _host: HTMLElement,\n    private _pane: HTMLElement,\n    private _config: ImmutableObject<OverlayConfig>,\n    private _ngZone: NgZone,\n    private _keyboardDispatcher: OverlayKeyboardDispatcher,\n    private _document: Document,\n    private _location: Location,\n    private _outsideClickDispatcher: OverlayOutsideClickDispatcher,\n    private _animationsDisabled = false,\n  ) {\n    if (_config.scrollStrategy) {\n      this._scrollStrategy = _config.scrollStrategy;\n      this._scrollStrategy.attach(this);\n    }\n\n    this._positionStrategy = _config.positionStrategy;\n  }\n\n  /** The overlay's HTML element */\n  get overlayElement(): HTMLElement {\n    return this._pane;\n  }\n\n  /** The overlay's backdrop HTML element. */\n  get backdropElement(): HTMLElement | null {\n    return this._backdropElement;\n  }\n\n  /**\n   * Wrapper around the panel element. Can be used for advanced\n   * positioning where a wrapper with specific styling is\n   * required around the overlay pane.\n   */\n  get hostElement(): HTMLElement {\n    return this._host;\n  }\n\n  attach<T>(portal: ComponentPortal<T>): ComponentRef<T>;\n  attach<T>(portal: TemplatePortal<T>): EmbeddedViewRef<T>;\n  attach(portal: any): any;\n\n  /**\n   * Attaches content, given via a Portal, to the overlay.\n   * If the overlay is configured to have a backdrop, it will be created.\n   *\n   * @param portal Portal instance to which to attach the overlay.\n   * @returns The portal attachment result.\n   */\n  attach(portal: Portal<any>): any {\n    // Insert the host into the DOM before attaching the portal, otherwise\n    // the animations module will skip animations on repeat attachments.\n    if (!this._host.parentElement && this._previousHostParent) {\n      this._previousHostParent.appendChild(this._host);\n    }\n\n    const attachResult = this._portalOutlet.attach(portal);\n\n    if (this._positionStrategy) {\n      this._positionStrategy.attach(this);\n    }\n\n    this._updateStackingOrder();\n    this._updateElementSize();\n    this._updateElementDirection();\n\n    if (this._scrollStrategy) {\n      this._scrollStrategy.enable();\n    }\n\n    // Update the position once the zone is stable so that the overlay will be fully rendered\n    // before attempting to position it, as the position may depend on the size of the rendered\n    // content.\n    this._ngZone.onStable.pipe(take(1)).subscribe(() => {\n      // The overlay could've been detached before the zone has stabilized.\n      if (this.hasAttached()) {\n        this.updatePosition();\n      }\n    });\n\n    // Enable pointer events for the overlay pane element.\n    this._togglePointerEvents(true);\n\n    if (this._config.hasBackdrop) {\n      this._attachBackdrop();\n    }\n\n    if (this._config.panelClass) {\n      this._toggleClasses(this._pane, this._config.panelClass, true);\n    }\n\n    // Only emit the `attachments` event once all other setup is done.\n    this._attachments.next();\n\n    // Track this overlay by the keyboard dispatcher\n    this._keyboardDispatcher.add(this);\n\n    if (this._config.disposeOnNavigation) {\n      this._locationChanges = this._location.subscribe(() => this.dispose());\n    }\n\n    this._outsideClickDispatcher.add(this);\n\n    // TODO(crisbeto): the null check is here, because the portal outlet returns `any`.\n    // We should be guaranteed for the result to be `ComponentRef | EmbeddedViewRef`, but\n    // `instanceof EmbeddedViewRef` doesn't appear to work at the moment.\n    if (typeof attachResult?.onDestroy === 'function') {\n      // In most cases we control the portal and we know when it is being detached so that\n      // we can finish the disposal process. The exception is if the user passes in a custom\n      // `ViewContainerRef` that isn't destroyed through the overlay API. Note that we use\n      // `detach` here instead of `dispose`, because we don't know if the user intends to\n      // reattach the overlay at a later point. It also has the advantage of waiting for animations.\n      attachResult.onDestroy(() => {\n        if (this.hasAttached()) {\n          // We have to delay the `detach` call, because detaching immediately prevents\n          // other destroy hooks from running. This is likely a framework bug similar to\n          // https://github.com/angular/angular/issues/46119\n          this._ngZone.runOutsideAngular(() => Promise.resolve().then(() => this.detach()));\n        }\n      });\n    }\n\n    return attachResult;\n  }\n\n  /**\n   * Detaches an overlay from a portal.\n   * @returns The portal detachment result.\n   */\n  detach(): any {\n    if (!this.hasAttached()) {\n      return;\n    }\n\n    this.detachBackdrop();\n\n    // When the overlay is detached, the pane element should disable pointer events.\n    // This is necessary because otherwise the pane element will cover the page and disable\n    // pointer events therefore. Depends on the position strategy and the applied pane boundaries.\n    this._togglePointerEvents(false);\n\n    if (this._positionStrategy && this._positionStrategy.detach) {\n      this._positionStrategy.detach();\n    }\n\n    if (this._scrollStrategy) {\n      this._scrollStrategy.disable();\n    }\n\n    const detachmentResult = this._portalOutlet.detach();\n\n    // Only emit after everything is detached.\n    this._detachments.next();\n\n    // Remove this overlay from keyboard dispatcher tracking.\n    this._keyboardDispatcher.remove(this);\n\n    // Keeping the host element in the DOM can cause scroll jank, because it still gets\n    // rendered, even though it's transparent and unclickable which is why we remove it.\n    this._detachContentWhenStable();\n    this._locationChanges.unsubscribe();\n    this._outsideClickDispatcher.remove(this);\n    return detachmentResult;\n  }\n\n  /** Cleans up the overlay from the DOM. */\n  dispose(): void {\n    const isAttached = this.hasAttached();\n\n    if (this._positionStrategy) {\n      this._positionStrategy.dispose();\n    }\n\n    this._disposeScrollStrategy();\n    this._disposeBackdrop(this._backdropElement);\n    this._locationChanges.unsubscribe();\n    this._keyboardDispatcher.remove(this);\n    this._portalOutlet.dispose();\n    this._attachments.complete();\n    this._backdropClick.complete();\n    this._keydownEvents.complete();\n    this._outsidePointerEvents.complete();\n    this._outsideClickDispatcher.remove(this);\n    this._host?.remove();\n\n    this._previousHostParent = this._pane = this._host = null!;\n\n    if (isAttached) {\n      this._detachments.next();\n    }\n\n    this._detachments.complete();\n  }\n\n  /** Whether the overlay has attached content. */\n  hasAttached(): boolean {\n    return this._portalOutlet.hasAttached();\n  }\n\n  /** Gets an observable that emits when the backdrop has been clicked. */\n  backdropClick(): Observable<MouseEvent> {\n    return this._backdropClick;\n  }\n\n  /** Gets an observable that emits when the overlay has been attached. */\n  attachments(): Observable<void> {\n    return this._attachments;\n  }\n\n  /** Gets an observable that emits when the overlay has been detached. */\n  detachments(): Observable<void> {\n    return this._detachments;\n  }\n\n  /** Gets an observable of keydown events targeted to this overlay. */\n  keydownEvents(): Observable<KeyboardEvent> {\n    return this._keydownEvents;\n  }\n\n  /** Gets an observable of pointer events targeted outside this overlay. */\n  outsidePointerEvents(): Observable<MouseEvent> {\n    return this._outsidePointerEvents;\n  }\n\n  /** Gets the current overlay configuration, which is immutable. */\n  getConfig(): OverlayConfig {\n    return this._config;\n  }\n\n  /** Updates the position of the overlay based on the position strategy. */\n  updatePosition(): void {\n    if (this._positionStrategy) {\n      this._positionStrategy.apply();\n    }\n  }\n\n  /** Switches to a new position strategy and updates the overlay position. */\n  updatePositionStrategy(strategy: PositionStrategy): void {\n    if (strategy === this._positionStrategy) {\n      return;\n    }\n\n    if (this._positionStrategy) {\n      this._positionStrategy.dispose();\n    }\n\n    this._positionStrategy = strategy;\n\n    if (this.hasAttached()) {\n      strategy.attach(this);\n      this.updatePosition();\n    }\n  }\n\n  /** Update the size properties of the overlay. */\n  updateSize(sizeConfig: OverlaySizeConfig): void {\n    this._config = {...this._config, ...sizeConfig};\n    this._updateElementSize();\n  }\n\n  /** Sets the LTR/RTL direction for the overlay. */\n  setDirection(dir: Direction | Directionality): void {\n    this._config = {...this._config, direction: dir};\n    this._updateElementDirection();\n  }\n\n  /** Add a CSS class or an array of classes to the overlay pane. */\n  addPanelClass(classes: string | string[]): void {\n    if (this._pane) {\n      this._toggleClasses(this._pane, classes, true);\n    }\n  }\n\n  /** Remove a CSS class or an array of classes from the overlay pane. */\n  removePanelClass(classes: string | string[]): void {\n    if (this._pane) {\n      this._toggleClasses(this._pane, classes, false);\n    }\n  }\n\n  /**\n   * Returns the layout direction of the overlay panel.\n   */\n  getDirection(): Direction {\n    const direction = this._config.direction;\n\n    if (!direction) {\n      return 'ltr';\n    }\n\n    return typeof direction === 'string' ? direction : direction.value;\n  }\n\n  /** Switches to a new scroll strategy. */\n  updateScrollStrategy(strategy: ScrollStrategy): void {\n    if (strategy === this._scrollStrategy) {\n      return;\n    }\n\n    this._disposeScrollStrategy();\n    this._scrollStrategy = strategy;\n\n    if (this.hasAttached()) {\n      strategy.attach(this);\n      strategy.enable();\n    }\n  }\n\n  /** Updates the text direction of the overlay panel. */\n  private _updateElementDirection() {\n    this._host.setAttribute('dir', this.getDirection());\n  }\n\n  /** Updates the size of the overlay element based on the overlay config. */\n  private _updateElementSize() {\n    if (!this._pane) {\n      return;\n    }\n\n    const style = this._pane.style;\n\n    style.width = coerceCssPixelValue(this._config.width);\n    style.height = coerceCssPixelValue(this._config.height);\n    style.minWidth = coerceCssPixelValue(this._config.minWidth);\n    style.minHeight = coerceCssPixelValue(this._config.minHeight);\n    style.maxWidth = coerceCssPixelValue(this._config.maxWidth);\n    style.maxHeight = coerceCssPixelValue(this._config.maxHeight);\n  }\n\n  /** Toggles the pointer events for the overlay pane element. */\n  private _togglePointerEvents(enablePointer: boolean) {\n    this._pane.style.pointerEvents = enablePointer ? '' : 'none';\n  }\n\n  /** Attaches a backdrop for this overlay. */\n  private _attachBackdrop() {\n    const showingClass = 'cdk-overlay-backdrop-showing';\n\n    this._backdropElement = this._document.createElement('div');\n    this._backdropElement.classList.add('cdk-overlay-backdrop');\n\n    if (this._animationsDisabled) {\n      this._backdropElement.classList.add('cdk-overlay-backdrop-noop-animation');\n    }\n\n    if (this._config.backdropClass) {\n      this._toggleClasses(this._backdropElement, this._config.backdropClass, true);\n    }\n\n    // Insert the backdrop before the pane in the DOM order,\n    // in order to handle stacked overlays properly.\n    this._host.parentElement!.insertBefore(this._backdropElement, this._host);\n\n    // Forward backdrop clicks such that the consumer of the overlay can perform whatever\n    // action desired when such a click occurs (usually closing the overlay).\n    this._backdropElement.addEventListener('click', this._backdropClickHandler);\n\n    // Add class to fade-in the backdrop after one frame.\n    if (!this._animationsDisabled && typeof requestAnimationFrame !== 'undefined') {\n      this._ngZone.runOutsideAngular(() => {\n        requestAnimationFrame(() => {\n          if (this._backdropElement) {\n            this._backdropElement.classList.add(showingClass);\n          }\n        });\n      });\n    } else {\n      this._backdropElement.classList.add(showingClass);\n    }\n  }\n\n  /**\n   * Updates the stacking order of the element, moving it to the top if necessary.\n   * This is required in cases where one overlay was detached, while another one,\n   * that should be behind it, was destroyed. The next time both of them are opened,\n   * the stacking will be wrong, because the detached element's pane will still be\n   * in its original DOM position.\n   */\n  private _updateStackingOrder() {\n    if (this._host.nextSibling) {\n      this._host.parentNode!.appendChild(this._host);\n    }\n  }\n\n  /** Detaches the backdrop (if any) associated with the overlay. */\n  detachBackdrop(): void {\n    const backdropToDetach = this._backdropElement;\n\n    if (!backdropToDetach) {\n      return;\n    }\n\n    if (this._animationsDisabled) {\n      this._disposeBackdrop(backdropToDetach);\n      return;\n    }\n\n    backdropToDetach.classList.remove('cdk-overlay-backdrop-showing');\n\n    this._ngZone.runOutsideAngular(() => {\n      backdropToDetach!.addEventListener('transitionend', this._backdropTransitionendHandler);\n    });\n\n    // If the backdrop doesn't have a transition, the `transitionend` event won't fire.\n    // In this case we make it unclickable and we try to remove it after a delay.\n    backdropToDetach.style.pointerEvents = 'none';\n\n    // Run this outside the Angular zone because there's nothing that Angular cares about.\n    // If it were to run inside the Angular zone, every test that used Overlay would have to be\n    // either async or fakeAsync.\n    this._backdropTimeout = this._ngZone.runOutsideAngular(() =>\n      setTimeout(() => {\n        this._disposeBackdrop(backdropToDetach);\n      }, 500),\n    );\n  }\n\n  /** Toggles a single CSS class or an array of classes on an element. */\n  private _toggleClasses(element: HTMLElement, cssClasses: string | string[], isAdd: boolean) {\n    const classes = coerceArray(cssClasses || []).filter(c => !!c);\n\n    if (classes.length) {\n      isAdd ? element.classList.add(...classes) : element.classList.remove(...classes);\n    }\n  }\n\n  /** Detaches the overlay content next time the zone stabilizes. */\n  private _detachContentWhenStable() {\n    // Normally we wouldn't have to explicitly run this outside the `NgZone`, however\n    // if the consumer is using `zone-patch-rxjs`, the `Subscription.unsubscribe` call will\n    // be patched to run inside the zone, which will throw us into an infinite loop.\n    this._ngZone.runOutsideAngular(() => {\n      // We can't remove the host here immediately, because the overlay pane's content\n      // might still be animating. This stream helps us avoid interrupting the animation\n      // by waiting for the pane to become empty.\n      const subscription = this._ngZone.onStable\n        .pipe(takeUntil(merge(this._attachments, this._detachments)))\n        .subscribe(() => {\n          // Needs a couple of checks for the pane and host, because\n          // they may have been removed by the time the zone stabilizes.\n          if (!this._pane || !this._host || this._pane.children.length === 0) {\n            if (this._pane && this._config.panelClass) {\n              this._toggleClasses(this._pane, this._config.panelClass, false);\n            }\n\n            if (this._host && this._host.parentElement) {\n              this._previousHostParent = this._host.parentElement;\n              this._host.remove();\n            }\n\n            subscription.unsubscribe();\n          }\n        });\n    });\n  }\n\n  /** Disposes of a scroll strategy. */\n  private _disposeScrollStrategy() {\n    const scrollStrategy = this._scrollStrategy;\n\n    if (scrollStrategy) {\n      scrollStrategy.disable();\n\n      if (scrollStrategy.detach) {\n        scrollStrategy.detach();\n      }\n    }\n  }\n\n  /** Removes a backdrop element from the DOM. */\n  private _disposeBackdrop(backdrop: HTMLElement | null) {\n    if (backdrop) {\n      backdrop.removeEventListener('click', this._backdropClickHandler);\n      backdrop.removeEventListener('transitionend', this._backdropTransitionendHandler);\n      backdrop.remove();\n\n      // It is possible that a new portal has been attached to this overlay since we started\n      // removing the backdrop. If that is the case, only clear the backdrop reference if it\n      // is still the same instance that we started to remove.\n      if (this._backdropElement === backdrop) {\n        this._backdropElement = null;\n      }\n    }\n\n    if (this._backdropTimeout) {\n      clearTimeout(this._backdropTimeout);\n      this._backdropTimeout = undefined;\n    }\n  }\n}\n\n/** Size properties for an overlay. */\nexport interface OverlaySizeConfig {\n  width?: number | string;\n  height?: number | string;\n  minWidth?: number | string;\n  minHeight?: number | string;\n  maxWidth?: number | string;\n  maxHeight?: number | string;\n}\n"]}