1 | /**
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2 | * @license
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3 | * Copyright Google LLC All Rights Reserved.
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4 | *
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5 | * Use of this source code is governed by an MIT-style license that can be
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6 | * found in the LICENSE file at https://angular.io/license
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7 | */
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8 | import { Injectable, NgZone, InjectionToken } from '@angular/core';
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9 | import { from, Subject } from 'rxjs';
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10 | import { take, takeUntil } from 'rxjs/operators';
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11 | import * as i0 from "@angular/core";
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12 | /**
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13 | * @docs-private
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14 | */
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15 | export class _Schedule {
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16 | constructor() {
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17 | this.tasks = [];
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18 | this.endTasks = [];
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19 | }
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20 | }
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21 | /** Injection token used to provide a coalesced style scheduler. */
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22 | export const _COALESCED_STYLE_SCHEDULER = new InjectionToken('_COALESCED_STYLE_SCHEDULER');
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23 | /**
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24 | * Allows grouping up CSSDom mutations after the current execution context.
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25 | * This can significantly improve performance when separate consecutive functions are
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26 | * reading from the CSSDom and then mutating it.
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27 | *
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28 | * @docs-private
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29 | */
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30 | export class _CoalescedStyleScheduler {
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31 | constructor(_ngZone) {
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32 | this._ngZone = _ngZone;
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33 | this._currentSchedule = null;
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34 | this._destroyed = new Subject();
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35 | }
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36 | /**
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37 | * Schedules the specified task to run at the end of the current VM turn.
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38 | */
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39 | schedule(task) {
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40 | this._createScheduleIfNeeded();
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41 | this._currentSchedule.tasks.push(task);
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42 | }
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43 | /**
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44 | * Schedules the specified task to run after other scheduled tasks at the end of the current
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45 | * VM turn.
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46 | */
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47 | scheduleEnd(task) {
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48 | this._createScheduleIfNeeded();
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49 | this._currentSchedule.endTasks.push(task);
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50 | }
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51 | /** Prevent any further tasks from running. */
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52 | ngOnDestroy() {
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53 | this._destroyed.next();
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54 | this._destroyed.complete();
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55 | }
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56 | _createScheduleIfNeeded() {
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57 | if (this._currentSchedule) {
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58 | return;
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59 | }
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60 | this._currentSchedule = new _Schedule();
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61 | this._getScheduleObservable()
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62 | .pipe(takeUntil(this._destroyed))
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63 | .subscribe(() => {
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64 | while (this._currentSchedule.tasks.length || this._currentSchedule.endTasks.length) {
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65 | const schedule = this._currentSchedule;
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66 | // Capture new tasks scheduled by the current set of tasks.
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67 | this._currentSchedule = new _Schedule();
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68 | for (const task of schedule.tasks) {
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69 | task();
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70 | }
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71 | for (const task of schedule.endTasks) {
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72 | task();
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73 | }
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74 | }
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75 | this._currentSchedule = null;
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76 | });
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77 | }
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78 | _getScheduleObservable() {
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79 | // Use onStable when in the context of an ongoing change detection cycle so that we
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80 | // do not accidentally trigger additional cycles.
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81 | return this._ngZone.isStable
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82 | ? from(Promise.resolve(undefined))
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83 | : this._ngZone.onStable.pipe(take(1));
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84 | }
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85 | }
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86 | _CoalescedStyleScheduler.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "14.0.1", ngImport: i0, type: _CoalescedStyleScheduler, deps: [{ token: i0.NgZone }], target: i0.ɵɵFactoryTarget.Injectable });
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87 | _CoalescedStyleScheduler.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "14.0.1", ngImport: i0, type: _CoalescedStyleScheduler });
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88 | i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "14.0.1", ngImport: i0, type: _CoalescedStyleScheduler, decorators: [{
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89 | type: Injectable
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90 | }], ctorParameters: function () { return [{ type: i0.NgZone }]; } });
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