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Angular 2 - a web framework for modern web apps

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import { EventEmitter } from 'angular2/src/facade/async'; import { NgZoneImpl } from './ng_zone_impl'; import { BaseException } from '../../facade/exceptions'; export { NgZoneError } from './ng_zone_impl'; /** * An injectable service for executing work inside or outside of the Angular zone. * * The most common use of this service is to optimize performance when starting a work consisting of * one or more asynchronous tasks that don't require UI updates or error handling to be handled by * Angular. Such tasks can be kicked off via {@link #runOutsideAngular} and if needed, these tasks * can reenter the Angular zone via {@link #run}. * * <!-- TODO: add/fix links to: * - docs explaining zones and the use of zones in Angular and change-detection * - link to runOutsideAngular/run (throughout this file!) * --> * * ### Example ([live demo](http://plnkr.co/edit/lY9m8HLy7z06vDoUaSN2?p=preview)) * ``` * import {Component, View, NgZone} from 'angular2/core'; * import {NgIf} from 'angular2/common'; * * @Component({ * selector: 'ng-zone-demo'. * template: ` * <h2>Demo: NgZone</h2> * * <p>Progress: {{progress}}%</p> * <p *ngIf="progress >= 100">Done processing {{label}} of Angular zone!</p> * * <button (click)="processWithinAngularZone()">Process within Angular zone</button> * <button (click)="processOutsideOfAngularZone()">Process outside of Angular zone</button> * `, * directives: [NgIf] * }) * export class NgZoneDemo { * progress: number = 0; * label: string; * * constructor(private _ngZone: NgZone) {} * * // Loop inside the Angular zone * // so the UI DOES refresh after each setTimeout cycle * processWithinAngularZone() { * this.label = 'inside'; * this.progress = 0; * this._increaseProgress(() => console.log('Inside Done!')); * } * * // Loop outside of the Angular zone * // so the UI DOES NOT refresh after each setTimeout cycle * processOutsideOfAngularZone() { * this.label = 'outside'; * this.progress = 0; * this._ngZone.runOutsideAngular(() => { * this._increaseProgress(() => { * // reenter the Angular zone and display done * this._ngZone.run(() => {console.log('Outside Done!') }); * }})); * } * * * _increaseProgress(doneCallback: () => void) { * this.progress += 1; * console.log(`Current progress: ${this.progress}%`); * * if (this.progress < 100) { * window.setTimeout(() => this._increaseProgress(doneCallback)), 10) * } else { * doneCallback(); * } * } * } * ``` */ export class NgZone { /** * @param {bool} enableLongStackTrace whether to enable long stack trace. They should only be * enabled in development mode as they significantly impact perf. */ constructor({ enableLongStackTrace = false }) { this._hasPendingMicrotasks = false; this._hasPendingMacrotasks = false; /** @internal */ this._isStable = true; /** @internal */ this._nesting = 0; /** @internal */ this._onUnstable = new EventEmitter(false); /** @internal */ this._onMicrotaskEmpty = new EventEmitter(false); /** @internal */ this._onStable = new EventEmitter(false); /** @internal */ this._onErrorEvents = new EventEmitter(false); this._zoneImpl = new NgZoneImpl({ trace: enableLongStackTrace, onEnter: () => { // console.log('ZONE.enter', this._nesting, this._isStable); this._nesting++; if (this._isStable) { this._isStable = false; this._onUnstable.emit(null); } }, onLeave: () => { this._nesting--; // console.log('ZONE.leave', this._nesting, this._isStable); this._checkStable(); }, setMicrotask: (hasMicrotasks) => { this._hasPendingMicrotasks = hasMicrotasks; this._checkStable(); }, setMacrotask: (hasMacrotasks) => { this._hasPendingMacrotasks = hasMacrotasks; }, onError: (error) => this._onErrorEvents.emit(error) }); } static isInAngularZone() { return NgZoneImpl.isInAngularZone(); } static assertInAngularZone() { if (!NgZoneImpl.isInAngularZone()) { throw new BaseException('Expected to be in Angular Zone, but it is not!'); } } static assertNotInAngularZone() { if (NgZoneImpl.isInAngularZone()) { throw new BaseException('Expected to not be in Angular Zone, but it is!'); } } _checkStable() { if (this._nesting == 0) { if (!this._hasPendingMicrotasks && !this._isStable) { try { // console.log('ZONE.microtaskEmpty'); this._nesting++; this._onMicrotaskEmpty.emit(null); } finally { this._nesting--; if (!this._hasPendingMicrotasks) { try { // console.log('ZONE.stable', this._nesting, this._isStable); this.runOutsideAngular(() => this._onStable.emit(null)); } finally { this._isStable = true; } } } } } } ; /** * Notifies when code enters Angular Zone. This gets fired first on VM Turn. */ get onUnstable() { return this._onUnstable; } /** * Notifies when there is no more microtasks enqueue in the current VM Turn. * This is a hint for Angular to do change detection, which may enqueue more microtasks. * For this reason this event can fire multiple times per VM Turn. */ get onMicrotaskEmpty() { return this._onMicrotaskEmpty; } /** * Notifies when the last `onMicrotaskEmpty` has run and there are no more microtasks, which * implies we are about to relinquish VM turn. * This event gets called just once. */ get onStable() { return this._onStable; } /** * Notify that an error has been delivered. */ get onError() { return this._onErrorEvents; } /** * Whether there are any outstanding microtasks. */ get hasPendingMicrotasks() { return this._hasPendingMicrotasks; } /** * Whether there are any outstanding microtasks. */ get hasPendingMacrotasks() { return this._hasPendingMacrotasks; } /** * Executes the `fn` function synchronously within the Angular zone and returns value returned by * the function. * * Running functions via `run` allows you to reenter Angular zone from a task that was executed * outside of the Angular zone (typically started via {@link #runOutsideAngular}). * * Any future tasks or microtasks scheduled from within this function will continue executing from * within the Angular zone. * * If a synchronous error happens it will be rethrown and not reported via `onError`. */ run(fn) { return this._zoneImpl.runInner(fn); 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Such tasks can be kicked off via {@link #runOutsideAngular} and if needed, these tasks\n * can reenter the Angular zone via {@link #run}.\n *\n * <!-- TODO: add/fix links to:\n *   - docs explaining zones and the use of zones in Angular and change-detection\n *   - link to runOutsideAngular/run (throughout this file!)\n *   -->\n *\n * ### Example ([live demo](http://plnkr.co/edit/lY9m8HLy7z06vDoUaSN2?p=preview))\n * ```\n * import {Component, View, NgZone} from 'angular2/core';\n * import {NgIf} from 'angular2/common';\n *\n * @Component({\n *   selector: 'ng-zone-demo'.\n *   template: `\n *     <h2>Demo: NgZone</h2>\n *\n *     <p>Progress: {{progress}}%</p>\n *     <p *ngIf=\"progress >= 100\">Done processing {{label}} of Angular zone!</p>\n *\n *     <button (click)=\"processWithinAngularZone()\">Process within Angular zone</button>\n *     <button (click)=\"processOutsideOfAngularZone()\">Process outside of Angular zone</button>\n *   `,\n *   directives: [NgIf]\n * })\n * export class NgZoneDemo {\n *   progress: number = 0;\n *   label: string;\n *\n *   constructor(private _ngZone: NgZone) {}\n *\n *   // Loop inside the Angular zone\n *   // so the UI DOES refresh after each setTimeout cycle\n *   processWithinAngularZone() {\n *     this.label = 'inside';\n *     this.progress = 0;\n *     this._increaseProgress(() => console.log('Inside Done!'));\n *   }\n *\n *   // Loop outside of the Angular zone\n *   // so the UI DOES NOT refresh after each setTimeout cycle\n *   processOutsideOfAngularZone() {\n *     this.label = 'outside';\n *     this.progress = 0;\n *     this._ngZone.runOutsideAngular(() => {\n *       this._increaseProgress(() => {\n *       // reenter the Angular zone and display done\n *       this._ngZone.run(() => {console.log('Outside Done!') });\n *     }}));\n *   }\n *\n *\n *   _increaseProgress(doneCallback: () => void) {\n *     this.progress += 1;\n *     console.log(`Current progress: ${this.progress}%`);\n *\n *     if (this.progress < 100) {\n *       window.setTimeout(() => this._increaseProgress(doneCallback)), 10)\n *     } else {\n *       doneCallback();\n *     }\n *   }\n * }\n * ```\n */\nexport class NgZone {\n  static isInAngularZone(): boolean { return NgZoneImpl.isInAngularZone(); }\n  static assertInAngularZone(): void {\n    if (!NgZoneImpl.isInAngularZone()) {\n      throw new BaseException('Expected to be in Angular Zone, but it is not!');\n    }\n  }\n  static assertNotInAngularZone(): void {\n    if (NgZoneImpl.isInAngularZone()) {\n      throw new BaseException('Expected to not be in Angular Zone, but it is!');\n    }\n  }\n\n  private _zoneImpl: NgZoneImpl;\n\n  private _hasPendingMicrotasks: boolean = false;\n  private _hasPendingMacrotasks: boolean = false;\n\n  /** @internal */\n  private _isStable = true;\n  /** @internal */\n  private _nesting = 0;\n  /** @internal */\n  private _onUnstable: EventEmitter<any> = new EventEmitter(false);\n  /** @internal */\n  private _onMicrotaskEmpty: EventEmitter<any> = new EventEmitter(false);\n  /** @internal */\n  private _onStable: EventEmitter<any> = new EventEmitter(false);\n  /** @internal */\n  private _onErrorEvents: EventEmitter<any> = new EventEmitter(false);\n\n  /**\n   * @param {bool} enableLongStackTrace whether to enable long stack trace. They should only be\n   *               enabled in development mode as they significantly impact perf.\n   */\n  constructor({enableLongStackTrace = false}) {\n    this._zoneImpl = new NgZoneImpl({\n      trace: enableLongStackTrace,\n      onEnter: () => {\n        // console.log('ZONE.enter', this._nesting, this._isStable);\n        this._nesting++;\n        if (this._isStable) {\n          this._isStable = false;\n          this._onUnstable.emit(null);\n        }\n      },\n      onLeave: () => {\n        this._nesting--;\n        // console.log('ZONE.leave', this._nesting, this._isStable);\n        this._checkStable();\n      },\n      setMicrotask: (hasMicrotasks: boolean) => {\n        this._hasPendingMicrotasks = hasMicrotasks;\n        this._checkStable();\n      },\n      setMacrotask: (hasMacrotasks: boolean) => { this._hasPendingMacrotasks = hasMacrotasks; },\n      onError: (error: NgZoneError) => this._onErrorEvents.emit(error)\n    });\n  }\n\n  private _checkStable() {\n    if (this._nesting == 0) {\n      if (!this._hasPendingMicrotasks && !this._isStable) {\n        try {\n          // console.log('ZONE.microtaskEmpty');\n          this._nesting++;\n          this._onMicrotaskEmpty.emit(null);\n        } finally {\n          this._nesting--;\n          if (!this._hasPendingMicrotasks) {\n            try {\n              // console.log('ZONE.stable', this._nesting, this._isStable);\n              this.runOutsideAngular(() => this._onStable.emit(null));\n            } finally {\n              this._isStable = true;\n            }\n          }\n        }\n      }\n    }\n  };\n\n  /**\n   * Notifies when code enters Angular Zone. This gets fired first on VM Turn.\n   */\n  get onUnstable(): EventEmitter<any> { return this._onUnstable; }\n\n  /**\n   * Notifies when there is no more microtasks enqueue in the current VM Turn.\n   * This is a hint for Angular to do change detection, which may enqueue more microtasks.\n   * For this reason this event can fire multiple times per VM Turn.\n   */\n  get onMicrotaskEmpty(): EventEmitter<any> { return this._onMicrotaskEmpty; }\n\n  /**\n   * Notifies when the last `onMicrotaskEmpty` has run and there are no more microtasks, which\n   * implies we are about to relinquish VM turn.\n   * This event gets called just once.\n   */\n  get onStable(): EventEmitter<any> { return this._onStable; }\n\n  /**\n   * Notify that an error has been delivered.\n   */\n  get onError(): EventEmitter<any> { return this._onErrorEvents; }\n\n  /**\n   * Whether there are any outstanding microtasks.\n   */\n  get hasPendingMicrotasks(): boolean { return this._hasPendingMicrotasks; }\n\n  /**\n   * Whether there are any outstanding microtasks.\n   */\n  get hasPendingMacrotasks(): boolean { return this._hasPendingMacrotasks; }\n\n  /**\n   * Executes the `fn` function synchronously within the Angular zone and returns value returned by\n   * the function.\n   *\n   * Running functions via `run` allows you to reenter Angular zone from a task that was executed\n   * outside of the Angular zone (typically started via {@link #runOutsideAngular}).\n   *\n   * Any future tasks or microtasks scheduled from within this function will continue executing from\n   * within the Angular zone.\n   *\n   * If a synchronous error happens it will be rethrown and not reported via `onError`.\n   */\n  run(fn: () => any): any { return this._zoneImpl.runInner(fn); }\n\n  /**\n   * Same as #run, except that synchronous errors are caught and forwarded\n   * via `onError` and not rethrown.\n   */\n  runGuarded(fn: () => any): any { return this._zoneImpl.runInnerGuarded(fn); }\n\n  /**\n   * Executes the `fn` function synchronously in Angular's parent zone and returns value returned by\n   * the function.\n   *\n   * Running functions via `runOutsideAngular` allows you to escape Angular's zone and do work that\n   * doesn't trigger Angular change-detection or is subject to Angular's error handling.\n   *\n   * Any future tasks or microtasks scheduled from within this function will continue executing from\n   * outside of the Angular zone.\n   *\n   * Use {@link #run} to reenter the Angular zone and do work that updates the application model.\n   */\n  runOutsideAngular(fn: () => any): any { return this._zoneImpl.runOuter(fn); }\n}\n"]}