@angular/cdk
Version:
Angular Material Component Development Kit
92 lines • 10.1 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 { 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
*/
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: "16.0.0", ngImport: i0, type: _CoalescedStyleScheduler, deps: [{ token: i0.NgZone }], target: i0.ɵɵFactoryTarget.Injectable }); }
static { this.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "16.0.0", ngImport: i0, type: _CoalescedStyleScheduler }); }
}
export { _CoalescedStyleScheduler };
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "16.0.0", ngImport: i0, type: _CoalescedStyleScheduler, decorators: [{
type: Injectable
}], ctorParameters: function () { return [{ type: i0.NgZone }]; } });
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