Method createScrollEvents

packages/router/src/router_scroller.ts:85–104

()

  }

  private createScrollEvents() {
    return this.transitions.events.subscribe((e) => {
      if (e instanceof NavigationStart) {
        // store the scroll position of the current stable navigations.
        this.store[this.lastId] = this.viewportScroller.getScrollPosition();
        this.lastSource = e.navigationTrigger;
        this.restoredId = e.restoredState ? e.restoredState.navigationId : 0;
      } else if (e instanceof NavigationEnd) {
        this.lastId = e.id;
        this.scheduleScrollEvent(e, this.urlSerializer.parse(e.urlAfterRedirects).fragment);
      } else if (
        e instanceof NavigationSkipped &&
        e.code === NavigationSkippedCode.IgnoredSameUrlNavigation
      ) {
        this.lastSource = undefined;
        this.restoredId = 0;
        this.scheduleScrollEvent(e, this.urlSerializer.parse(e.url).fragment);
      }
    });
  }

  private consumeScrollEvents() {
    return this.transitions.events.subscribe((e) => {