/**
 * @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 { Injectable, NgZone, InjectionToken } from '@angular/core';
import { from, Subject } from 'rxjs';
import { take, takeUntil } from 'rxjs/operators';
import * as i0 from "@angular/core";
/**
 * @docs-private
 */
export class _Schedule {
    constructor() {
        this.tasks = [];
        this.endTasks = [];
    }
}
/** Injection token used to provide a coalesced style scheduler. */
export const _COALESCED_STYLE_SCHEDULER = new InjectionToken('_COALESCED_STYLE_SCHEDULER');
/**
 * Allows grouping up CSSDom mutations after the current execution context.
 * This can significantly improve performance when separate consecutive functions are
 * reading from the CSSDom and then mutating it.
 *
 * @docs-private
 */
export class _CoalescedStyleScheduler {
    constructor(_ngZone) {
        this._ngZone = _ngZone;
        this._currentSchedule = null;
        this._destroyed = new Subject();
    }
    /**
     * Schedules the specified task to run at the end of the current VM turn.
     */
    schedule(task) {
        this._createScheduleIfNeeded();
        this._currentSchedule.tasks.push(task);
    }
    /**
     * Schedules the specified task to run after other scheduled tasks at the end of the current
     * VM turn.
     */
    scheduleEnd(task) {
        this._createScheduleIfNeeded();
        this._currentSchedule.endTasks.push(task);
    }
    /** Prevent any further tasks from running. */
    ngOnDestroy() {
        this._destroyed.next();
        this._destroyed.complete();
    }
    _createScheduleIfNeeded() {
        if (this._currentSchedule) {
            return;
        }
        this._currentSchedule = new _Schedule();
        this._getScheduleObservable()
            .pipe(takeUntil(this._destroyed))
            .subscribe(() => {
            while (this._currentSchedule.tasks.length || this._currentSchedule.endTasks.length) {
                const schedule = this._currentSchedule;
                // Capture new tasks scheduled by the current set of tasks.
                this._currentSchedule = new _Schedule();
                for (const task of schedule.tasks) {
                    task();
                }
                for (const task of schedule.endTasks) {
                    task();
                }
            }
            this._currentSchedule = null;
        });
    }
    _getScheduleObservable() {
        // Use onStable when in the context of an ongoing change detection cycle so that we
        // do not accidentally trigger additional cycles.
        return this._ngZone.isStable
            ? from(Promise.resolve(undefined))
            : this._ngZone.onStable.pipe(take(1));
    }
    static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: _CoalescedStyleScheduler, deps: [{ token: i0.NgZone }], target: i0.ɵɵFactoryTarget.Injectable }); }
    static { this.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: _CoalescedStyleScheduler }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "16.1.1", ngImport: i0, type: _CoalescedStyleScheduler, decorators: [{
            type: Injectable
        }], ctorParameters: function () { return [{ type: i0.NgZone }]; } });
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