Angular Cdk步进器，如何检测何时添加新的步长

import { CdkStepper } from '@angular/cdk/stepper';
import { AfterViewInit, Component, ViewChild } from '@angular/core';

@Component({
  selector: 'app-your-component',
  templateUrl: 'your-component.html',
  styleUrls: ['your-component.css']
})
export class YourComponent implements AfterViewInit {
  @ViewChild(CdkStepper) stepper: CdkStepper;

  ngAfterViewInit() {
    this.stepper.selectionChange.subscribe(() => {
      // 当步进器状态变化时触发该事件
      // 在这里进行添加新步长的逻辑处理
    });
  }
}

this.stepper.selectionChange.subscribe(() => {
  if (this.stepper.selectedIndex === this.stepper.steps.length - 1) {
    // 当前步骤是最后一个步骤
    if (someCondition) {
      // 满足条件时添加新的步长
      this.stepper.addStep(newStep);
    }
  }
});