node_modules/@angular/material/esm2015/core/common-behaviors/initialized.js

/**
 * @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 { Observable } from 'rxjs';
/** Mixin to augment a directive with an initialized property that will emits when ngOnInit ends. */
export function mixinInitialized(base) {
    return class extends base {
        constructor(...args) {
            super(...args);
            /** Whether this directive has been marked as initialized. */
            this._isInitialized = false;
            /**
             * List of subscribers that subscribed before the directive was initialized. Should be notified
             * during _markInitialized. Set to null after pending subscribers are notified, and should
             * not expect to be populated after.
             */
            this._pendingSubscribers = [];
            /**
             * Observable stream that emits when the directive initializes. If already initialized, the
             * subscriber is stored to be notified once _markInitialized is called.
             */
            this.initialized = new Observable(subscriber => {
                // If initialized, immediately notify the subscriber. Otherwise store the subscriber to notify
                // when _markInitialized is called.
                if (this._isInitialized) {
                    this._notifySubscriber(subscriber);
                }
                else {
                    this._pendingSubscribers.push(subscriber);
                }
            });
        }
        /**
         * Marks the state as initialized and notifies pending subscribers. Should be called at the end
         * of ngOnInit.
         * @docs-private
         */
        _markInitialized() {
            if (this._isInitialized && (typeof ngDevMode === 'undefined' || ngDevMode)) {
                throw Error('This directive has already been marked as initialized and ' +
                    'should not be called twice.');
            }
            this._isInitialized = true;
            this._pendingSubscribers.forEach(this._notifySubscriber);
            this._pendingSubscribers = null;
        }
        /** Emits and completes the subscriber stream (should only emit once). */
        _notifySubscriber(subscriber) {
            subscriber.next();
            subscriber.complete();
        }
    };
}
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