@angular/material
Version:
Angular Material
105 lines • 9.52 kB
JavaScript
/**
* @fileoverview added by tsickle
* Generated from: src/material/core/common-behaviors/initialized.ts
* @suppress {checkTypes,constantProperty,extraRequire,missingOverride,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
*/
/**
* @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 that adds an initialized property to a directive which, when subscribed to, will emit a
* value once markInitialized has been called, which should be done during the ngOnInit function.
* If the subscription is made after it has already been marked as initialized, then it will trigger
* an emit immediately.
* \@docs-private
* @record
*/
export function HasInitialized() { }
if (false) {
/**
* Stream that emits once during the directive/component's ngOnInit.
* @type {?}
*/
HasInitialized.prototype.initialized;
/**
* Sets the state as initialized and must be called during ngOnInit to notify subscribers that
* the directive has been initialized.
* \@docs-private
* @type {?}
*/
HasInitialized.prototype._markInitialized;
}
/**
* Mixin to augment a directive with an initialized property that will emits when ngOnInit ends.
* @template T
* @param {?} base
* @return {?}
*/
export function mixinInitialized(base) {
return class extends base {
/**
* @param {...?} args
*/
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((/**
* @param {?} subscriber
* @return {?}
*/
subscriber => {
// If initialized, immediately notify the subscriber. Otherwise store the subscriber to notify
// when _markInitialized is called.
if (this._isInitialized) {
this._notifySubscriber(subscriber);
}
else {
(/** @type {?} */ (this._pendingSubscribers)).push(subscriber);
}
}));
}
/**
* Marks the state as initialized and notifies pending subscribers. Should be called at the end
* of ngOnInit.
* \@docs-private
* @return {?}
*/
_markInitialized() {
if (this._isInitialized) {
throw Error('This directive has already been marked as initialized and ' +
'should not be called twice.');
}
this._isInitialized = true;
(/** @type {?} */ (this._pendingSubscribers)).forEach(this._notifySubscriber);
this._pendingSubscribers = null;
}
/**
* Emits and completes the subscriber stream (should only emit once).
* @param {?} subscriber
* @return {?}
*/
_notifySubscriber(subscriber) {
subscriber.next();
subscriber.complete();
}
};
}
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