angular材质如何在下拉焦点上禁用全局滚动？

<mat-form-field>
  <mat-label>选择项</mat-label>
  <mat-select>
    <mat-option value="option1">选项1</mat-option>
    <mat-option value="option2">选项2</mat-option>
    <mat-option value="option3">选项3</mat-option>
  </mat-select>
</mat-form-field>

.cdk-global-scrollblock {
  overflow: hidden !important;
}

import { ScrollDispatcher } from '@angular/cdk/scrolling';

constructor(private scrollDispatcher: ScrollDispatcher) {}

ngOnInit() {
  this.scrollDispatcher.scrolled().subscribe(() => {
    // 在这里根据需要禁用或启用滚动
  });
}

disableScroll() {
  this.scrollDispatcher.disable();
}

enableScroll() {
  this.scrollDispatcher.enable();
}