Method constructor

src/cdk/drag-drop/drop-list-ref.ts:214–226

(
    element: ElementRef<HTMLElement> | HTMLElement,
    private _dragDropRegistry: DragDropRegistry,
    _document: any,
    private _ngZone: NgZone,
    private _viewportRuler: ViewportRuler,
  )

  private _direction: Direction = 'ltr';

  constructor(
    element: ElementRef<HTMLElement> | HTMLElement,
    private _dragDropRegistry: DragDropRegistry,
    _document: any,
    private _ngZone: NgZone,
    private _viewportRuler: ViewportRuler,
  ) {
    const coercedElement = (this.element = coerceElement(element));
    this._document = _document;
    this.withOrientation('vertical').withElementContainer(coercedElement);
    _dragDropRegistry.registerDropContainer(this);
    this._parentPositions = new ParentPositionTracker(_document);
  }

  /** Removes the drop list functionality from the DOM element. */
  dispose() {