dragRef
          .withPlaceholderTemplate(placeholder)
          .withPreviewTemplate(preivew);

      dragRef.beforeStarted.subscribe(() => {
        const placeholder = {
          template: this.placeholderRef,
          context: undefined,
          viewContainer: this.viewContainerRef,
        };
        const preivew = {
          template: this.previewRef,
          context: undefined,
          viewContainer: this.viewContainerRef,
        };

  @ViewChild('preview', { read: TemplateRef })
  previewRef: TemplateRef<HTMLElement>;

  @ViewChild('placeholder', { read: TemplateRef })
  placeholderRef: TemplateRef<any>;