Method ngAfterContentInit

src/material/stepper/stepper.ts:83–98

()

  _portal!: TemplatePortal;

  ngAfterContentInit() {
    this._isSelected = this._stepper.steps.changes
      .pipe(
        switchMap(() => {
          return this._stepper.selectionChange.pipe(
            map(event => event.selectedStep === this),
            startWith(this._stepper.selected === this),
          );
        }),
      )
      .subscribe(isSelected => {
        if (isSelected && this._lazyContent && !this._portal) {
          this._portal = new TemplatePortal(this._lazyContent._template, this._viewContainerRef!);
        }
      });
  }

  ngOnDestroy() {
    this._isSelected.unsubscribe();