{
  "version": 3,
  "sources": ["src/app/shared/scroll/scrollbar.service.ts"],
  "sourcesContent": ["import { Platform } from '@angular/cdk/platform';\r\n// Import the core angular services.\r\nimport { Injectable, Inject, OnDestroy, ElementRef, Renderer2, RendererFactory2, NgZone } from '@angular/core';\r\nimport { Router, Scroll, Event } from '@angular/router';\r\nimport { LazyLoadService } from 'app/lazy-load/lazy-load.service';\r\nimport { NgScrollbar } from 'ngx-scrollbar';\r\nimport { of, Subject, Subscription, Observable, Observer, distinctUntilChanged, fromEvent } from 'rxjs';\r\nimport { auditTime, filter, pluck, startWith, pairwise, map, take, switchMap } from 'rxjs/operators';\r\n\r\n/** Time in ms to throttle the scrolling events by default. */\r\nexport const DEFAULT_SCROLL_TIME = 20;\r\n\r\nexport interface ScrollbarDictionary {\r\n  [key: string]: NgScrollbar;\r\n}\r\n\r\n// TODO: Add Angular decorator.\r\n@Injectable({\r\n  providedIn: 'root'\r\n})\r\nexport class ScrollBarService implements OnDestroy {\r\n  private renderer: Renderer2; // creato da factory\r\n  scrollbars: Map<NgScrollbar, Subscription> = new Map();\r\n\r\n  /** Subject for notifying that a registered scrollable reference element has been scrolled. */\r\n  private _scrolled = new Subject<NgScrollbar | void>();\r\n  /** Keeps track of the amount of subscriptions to `scrolled`. Used for cleaning up afterwards. */\r\n  private _scrolledCount = 0;\r\n  private _disableMonitor = false;\r\n\r\n  public get mainScrollbar(): NgScrollbar {\r\n    if (!this._mainScrollbar) {\r\n      const mainScrollbar = this.getById('main-scrollbar');\r\n      if (mainScrollbar) {\r\n        this._mainScrollbar = mainScrollbar;\r\n      }\r\n    }\r\n    return this._mainScrollbar;\r\n  }\r\n  private _mainScrollbar: NgScrollbar;\r\n\r\n  constructor(\r\n    private platform: Platform,\r\n    private router: Router,\r\n    rendererFactory: RendererFactory2,\r\n    private lazyLoadService: LazyLoadService,\r\n    private zone: NgZone\r\n  ) {\r\n    if (platform.isBrowser) {\r\n\r\n      if ('onwheel' in document.createElement('div')) {\r\n        fromEvent(document, 'wheel')\r\n        .pipe(\r\n          take(1),\r\n          // https://github.com/gblazex/smoothscroll-for-websites v 1.4.10\r\n          switchMap(() => this.lazyLoadService.loadScript('/lib/SmoothScroll.min.js', true))\r\n        )\r\n        .subscribe(() => {\r\n          this.setSmoothScroll()\r\n        });\r\n      }\r\n\r\n      this.renderer = rendererFactory.createRenderer(null, null);\r\n      this.router.events.pipe(\r\n        filter((e: Event): e is Scroll => e instanceof Scroll)\r\n      ).subscribe(e => {\r\n        // c'è un problema con la mainScrollbar, che sembra che non aggiorni passando da una pagina all'altra\r\n        // se ad esempio passi dalla pagina login (aggiornata) alla home, non mostra più la scrollbar\r\n        // setTimeout(() => {\r\n        //   this.mainScrollbar.update();\r\n        // }, 100);\r\n\r\n        if (e.position) {\r\n          // backward navigation\r\n          this.mainScrollbar.scrollTo({ top: e.position[1], duration: 500 });\r\n        } else if (e.anchor) {\r\n          // anchor navigation\r\n          const target = this.mainScrollbar.viewport.nativeElement.querySelector(`#${e.anchor}`);\r\n\r\n          if (target) {\r\n            this.mainScrollbar.scrollToElement(`#${e.anchor}`);\r\n          }\r\n\r\n        } else {\r\n          // forward navigation\r\n          this.mainScrollbar.viewport.nativeElement.scrollTop = 0;\r\n        }\r\n      });\r\n    }\r\n  }\r\n\r\n  register(scrollable: NgScrollbar): void {\r\n    if (!this.scrollbars.has(scrollable)) {\r\n      // this.scrollbars.set(scrollable, scrollable.scrolled\r\n      //   .subscribe(() => this._scrolled.next(scrollable)));\r\n      this.scrollbars.set(scrollable, null);\r\n    }\r\n  }\r\n\r\n  /**\r\n   * Deregisters a Scrollable reference and unsubscribes from its scroll event observable.\r\n   * @param ngScrollBar Scrollable instance to be deregistered.\r\n   */\r\n  deregister(scrollable: NgScrollbar): void {\r\n    const scrollableReference = this.scrollbars.get(scrollable);\r\n\r\n    if (scrollableReference) {\r\n      scrollableReference.unsubscribe();\r\n      this.scrollbars.delete(scrollable);\r\n    }\r\n  }\r\n\r\n  scrolled(auditTimeInMs: number = DEFAULT_SCROLL_TIME): Observable<NgScrollbar | void> {\r\n    if (this.platform.isBrowser) {\r\n      return of(null);\r\n    }\r\n\r\n    return new Observable((observer: Observer<NgScrollbar | void>) => {\r\n      // In the case of a 0ms delay, use an observable without auditTime\r\n      // since it does add a perceptible delay in processing overhead.\r\n      const subscription = auditTimeInMs > 0 ?\r\n        this._scrolled.pipe(auditTime(auditTimeInMs)).subscribe(observer) :\r\n        this._scrolled.subscribe(observer);\r\n\r\n      this._scrolledCount++;\r\n\r\n      return () => {\r\n        subscription.unsubscribe();\r\n        this._scrolledCount--;\r\n      };\r\n    });\r\n  }\r\n\r\n  ngOnDestroy(): void {\r\n    this.scrollbars.forEach((_, container) => this.deregister(container));\r\n    this._scrolled.complete();\r\n  }\r\n\r\n  /**\r\n   * Returns an observable that emits whenever any of the\r\n   * scrollable ancestors of an element are scrolled.\r\n   * @param elementRef Element whose ancestors to listen for.\r\n   * @param auditTimeInMs Time to throttle the scroll events.\r\n   */\r\n  ancestorScrolled(elementRef: ElementRef, auditTimeInMs?: number): Observable<NgScrollbar | void> {\r\n    const ancestors = this.getAncestorScrollBars(elementRef);\r\n\r\n    return this.scrolled(auditTimeInMs).pipe(filter(target => {\r\n      return !target || ancestors.indexOf(target) > -1;\r\n    }));\r\n  }\r\n\r\n  /** Returns all registered Scrollables that contain the provided element. */\r\n  getAncestorScrollBars(elementRef: ElementRef): NgScrollbar[] {\r\n    const scrollBars: NgScrollbar[] = [];\r\n\r\n    this.scrollbars.forEach((_subscription: Subscription, scrollBar: NgScrollbar) => {\r\n      if (this._scrollableContainsElement(scrollBar, elementRef)) {\r\n        scrollBars.push(scrollBar);\r\n      }\r\n    });\r\n\r\n    return scrollBars;\r\n  }\r\n\r\n  /** Returns true if the element is contained within the provided Scrollable. */\r\n  private _scrollableContainsElement(scrollBar: NgScrollbar, elementRef: ElementRef): boolean {\r\n    let element: HTMLElement | null = elementRef.nativeElement;\r\n    const scrollableElement = scrollBar.nativeElement;\r\n\r\n    // Traverse through the element parents until we reach null, checking if any of the elements\r\n    // are the scrollable's element.\r\n    do {\r\n      if (element == scrollableElement) { return true; }\r\n    } while (element = element!.parentElement);\r\n\r\n    return false;\r\n  }\r\n\r\n  public getById(id: string): NgScrollbar {\r\n    for (const sb of this.scrollbars.keys()) {\r\n      if (sb.nativeElement.id === id) {\r\n        return sb;\r\n      }\r\n    }\r\n    return null;\r\n  }\r\n\r\n  public monitorScrollTop(scrollbar: NgScrollbar, ignorePageRestoring?: boolean): Observable<[any, any]> {\r\n    return fromEvent(scrollbar.viewport.nativeElement, 'scroll')\r\n      .pipe(\r\n        startWith(0),\r\n        filter(() =>  (this._disableMonitor && ignorePageRestoring) ? false : true),\r\n        pluck('target', 'scrollTop'),\r\n        pairwise()\r\n      );\r\n  }\r\n\r\n  public reachedBottom(scrollbar?: NgScrollbar, offset = 0): Observable<boolean> {\r\n    scrollbar = scrollbar ? scrollbar : this.mainScrollbar;\r\n    return fromEvent(scrollbar.viewport.nativeElement, 'scroll')\r\n      .pipe(\r\n        map(({target}: any) => target.scrollTop + target.clientHeight >= target.scrollHeight - offset),\r\n        distinctUntilChanged()\r\n      );\r\n  }\r\n\r\n  public addScrollMonitor(id: string, sb: NgScrollbar): void {\r\n    if (this.getById(id)) {\r\n      throw new Error(`${id} was alrady be added to the monitor scroll service`);\r\n    }\r\n    this.scrollbars[id] = sb;\r\n  }\r\n\r\n  setSmoothScroll(customOptions?: any): void {\r\n    if (window['SmoothScroll']) {\r\n      let defaultOptions = {\r\n        keyboardSupport: false,\r\n        animationTime: 600, //400\r\n        stepSize: 80, // 100\r\n        accelerationDelta : 50,  // 50\r\n        accelerationMax   : 3,   // 3\r\n      };\r\n\r\n      const opt = customOptions ? Object.assign(defaultOptions, customOptions) : defaultOptions\r\n      this.zone.runOutsideAngular(() => {\r\n        window['SmoothScroll'](opt);\r\n      });\r\n\r\n    }\r\n  }\r\n\r\n  public removeScrollMonitor(id: string): void {\r\n    delete this.scrollbars[id];\r\n  }\r\n}\r\n"],
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}