@angular/material
Version:
Angular Material
66 lines • 8.57 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 { __extends, __read, __spread } from "tslib";
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 */ (function (_super) {
__extends(class_1, _super);
function class_1() {
var args = [];
for (var _i = 0; _i < arguments.length; _i++) {
args[_i] = arguments[_i];
}
var _this = _super.apply(this, __spread(args)) || this;
/** 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(function (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);
}
});
return _this;
}
/**
* Marks the state as initialized and notifies pending subscribers. Should be called at the end
* of ngOnInit.
* @docs-private
*/
class_1.prototype._markInitialized = function () {
if (this._isInitialized) {
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). */
class_1.prototype._notifySubscriber = function (subscriber) {
subscriber.next();
subscriber.complete();
};
return class_1;
}(base));
}
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