/**
 * @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 { inject, Injectable, NgZone } from '@angular/core';
import { Observable, Subject } from 'rxjs';
import { filter, shareReplay, takeUntil } from 'rxjs/operators';
import * as i0 from "@angular/core";
/**
 * Handler that logs "ResizeObserver loop limit exceeded" errors.
 * These errors are not shown in the Chrome console, so we log them to ensure developers are aware.
 * @param e The error
 */
const loopLimitExceededErrorHandler = (e) => {
    if (e instanceof Error && e.message === 'ResizeObserver loop limit exceeded') {
        console.error(`${e.message}. This could indicate a performance issue with your app. See https://github.com/WICG/resize-observer/blob/master/explainer.md#error-handling`);
    }
};
/**
 * A shared ResizeObserver to be used for a particular box type (content-box, border-box, or
 * device-pixel-content-box)
 */
class SingleBoxSharedResizeObserver {
    constructor(
    /** The box type to observe for resizes. */
    _box) {
        this._box = _box;
        /** Stream that emits when the shared observer is destroyed. */
        this._destroyed = new Subject();
        /** Stream of all events from the ResizeObserver. */
        this._resizeSubject = new Subject();
        /** A map of elements to streams of their resize events. */
        this._elementObservables = new Map();
        if (typeof ResizeObserver !== 'undefined') {
            this._resizeObserver = new ResizeObserver(entries => this._resizeSubject.next(entries));
        }
    }
    /**
     * Gets a stream of resize events for the given element.
     * @param target The element to observe.
     * @return The stream of resize events for the element.
     */
    observe(target) {
        if (!this._elementObservables.has(target)) {
            this._elementObservables.set(target, new Observable(observer => {
                const subscription = this._resizeSubject.subscribe(observer);
                this._resizeObserver?.observe(target, { box: this._box });
                return () => {
                    this._resizeObserver?.unobserve(target);
                    subscription.unsubscribe();
                    this._elementObservables.delete(target);
                };
            }).pipe(filter(entries => entries.some(entry => entry.target === target)), 
            // Share a replay of the last event so that subsequent calls to observe the same element
            // receive initial sizing info like the first one. Also enable ref counting so the
            // element will be automatically unobserved when there are no more subscriptions.
            shareReplay({ bufferSize: 1, refCount: true }), takeUntil(this._destroyed)));
        }
        return this._elementObservables.get(target);
    }
    /** Destroys this instance. */
    destroy() {
        this._destroyed.next();
        this._destroyed.complete();
        this._resizeSubject.complete();
        this._elementObservables.clear();
    }
}
/**
 * Allows observing resize events on multiple elements using a shared set of ResizeObserver.
 * Sharing a ResizeObserver instance is recommended for better performance (see
 * https://github.com/WICG/resize-observer/issues/59).
 *
 * Rather than share a single `ResizeObserver`, this class creates one `ResizeObserver` per type
 * of observed box ('content-box', 'border-box', and 'device-pixel-content-box'). This avoids
 * later calls to `observe` with a different box type from influencing the events dispatched to
 * earlier calls.
 */
export class SharedResizeObserver {
    constructor() {
        /** Map of box type to shared resize observer. */
        this._observers = new Map();
        /** The Angular zone. */
        this._ngZone = inject(NgZone);
        if (typeof ResizeObserver !== 'undefined' && (typeof ngDevMode === 'undefined' || ngDevMode)) {
            this._ngZone.runOutsideAngular(() => {
                window.addEventListener('error', loopLimitExceededErrorHandler);
            });
        }
    }
    ngOnDestroy() {
        for (const [, observer] of this._observers) {
            observer.destroy();
        }
        this._observers.clear();
        if (typeof ResizeObserver !== 'undefined' && (typeof ngDevMode === 'undefined' || ngDevMode)) {
            window.removeEventListener('error', loopLimitExceededErrorHandler);
        }
    }
    /**
     * Gets a stream of resize events for the given target element and box type.
     * @param target The element to observe for resizes.
     * @param options Options to pass to the `ResizeObserver`
     * @return The stream of resize events for the element.
     */
    observe(target, options) {
        const box = options?.box || 'content-box';
        if (!this._observers.has(box)) {
            this._observers.set(box, new SingleBoxSharedResizeObserver(box));
        }
        return this._observers.get(box).observe(target);
    }
    static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: SharedResizeObserver, deps: [], target: i0.ɵɵFactoryTarget.Injectable }); }
    static { this.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: SharedResizeObserver, providedIn: 'root' }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: SharedResizeObserver, decorators: [{
            type: Injectable,
            args: [{
                    providedIn: 'root',
                }]
        }], ctorParameters: function () { return []; } });
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This could indicate a performance issue with your app. See https://github.com/WICG/resize-observer/blob/master/explainer.md#error-handling`,\n    );\n  }\n};\n\n/**\n * A shared ResizeObserver to be used for a particular box type (content-box, border-box, or\n * device-pixel-content-box)\n */\nclass SingleBoxSharedResizeObserver {\n  /** Stream that emits when the shared observer is destroyed. */\n  private _destroyed = new Subject<void>();\n  /** Stream of all events from the ResizeObserver. */\n  private _resizeSubject = new Subject<ResizeObserverEntry[]>();\n  /** ResizeObserver used to observe element resize events. */\n  private _resizeObserver?: ResizeObserver;\n  /** A map of elements to streams of their resize events. */\n  private _elementObservables = new Map<Element, Observable<ResizeObserverEntry[]>>();\n\n  constructor(\n    /** The box type to observe for resizes. */\n    private _box: ResizeObserverBoxOptions,\n  ) {\n    if (typeof ResizeObserver !== 'undefined') {\n      this._resizeObserver = new ResizeObserver(entries => this._resizeSubject.next(entries));\n    }\n  }\n\n  /**\n   * Gets a stream of resize events for the given element.\n   * @param target The element to observe.\n   * @return The stream of resize events for the element.\n   */\n  observe(target: Element): Observable<ResizeObserverEntry[]> {\n    if (!this._elementObservables.has(target)) {\n      this._elementObservables.set(\n        target,\n        new Observable<ResizeObserverEntry[]>(observer => {\n          const subscription = this._resizeSubject.subscribe(observer);\n          this._resizeObserver?.observe(target, {box: this._box});\n          return () => {\n            this._resizeObserver?.unobserve(target);\n            subscription.unsubscribe();\n            this._elementObservables.delete(target);\n          };\n        }).pipe(\n          filter(entries => entries.some(entry => entry.target === target)),\n          // Share a replay of the last event so that subsequent calls to observe the same element\n          // receive initial sizing info like the first one. Also enable ref counting so the\n          // element will be automatically unobserved when there are no more subscriptions.\n          shareReplay({bufferSize: 1, refCount: true}),\n          takeUntil(this._destroyed),\n        ),\n      );\n    }\n    return this._elementObservables.get(target)!;\n  }\n\n  /** Destroys this instance. */\n  destroy() {\n    this._destroyed.next();\n    this._destroyed.complete();\n    this._resizeSubject.complete();\n    this._elementObservables.clear();\n  }\n}\n\n/**\n * Allows observing resize events on multiple elements using a shared set of ResizeObserver.\n * Sharing a ResizeObserver instance is recommended for better performance (see\n * https://github.com/WICG/resize-observer/issues/59).\n *\n * Rather than share a single `ResizeObserver`, this class creates one `ResizeObserver` per type\n * of observed box ('content-box', 'border-box', and 'device-pixel-content-box'). This avoids\n * later calls to `observe` with a different box type from influencing the events dispatched to\n * earlier calls.\n */\n@Injectable({\n  providedIn: 'root',\n})\nexport class SharedResizeObserver implements OnDestroy {\n  /** Map of box type to shared resize observer. */\n  private _observers = new Map<ResizeObserverBoxOptions, SingleBoxSharedResizeObserver>();\n\n  /** The Angular zone. */\n  private _ngZone = inject(NgZone);\n\n  constructor() {\n    if (typeof ResizeObserver !== 'undefined' && (typeof ngDevMode === 'undefined' || ngDevMode)) {\n      this._ngZone.runOutsideAngular(() => {\n        window.addEventListener('error', loopLimitExceededErrorHandler);\n      });\n    }\n  }\n\n  ngOnDestroy() {\n    for (const [, observer] of this._observers) {\n      observer.destroy();\n    }\n    this._observers.clear();\n    if (typeof ResizeObserver !== 'undefined' && (typeof ngDevMode === 'undefined' || ngDevMode)) {\n      window.removeEventListener('error', loopLimitExceededErrorHandler);\n    }\n  }\n\n  /**\n   * Gets a stream of resize events for the given target element and box type.\n   * @param target The element to observe for resizes.\n   * @param options Options to pass to the `ResizeObserver`\n   * @return The stream of resize events for the element.\n   */\n  observe(target: Element, options?: ResizeObserverOptions): Observable<ResizeObserverEntry[]> {\n    const box = options?.box || 'content-box';\n    if (!this._observers.has(box)) {\n      this._observers.set(box, new SingleBoxSharedResizeObserver(box));\n    }\n    return this._observers.get(box)!.observe(target);\n  }\n}\n"]}