Method constructor

src/cdk/drag-drop/drag-ref.ts:417–429

(
    element: ElementRef<HTMLElement> | HTMLElement,
    private _config: DragRefConfig,
    private _document: Document,
    private _ngZone: NgZone,
    private _viewportRuler: ViewportRuler,
    private _dragDropRegistry: DragDropRegistry,
    private _renderer: Renderer2,
  )

  constrainPosition?: DragConstrainPosition;

  constructor(
    element: ElementRef<HTMLElement> | HTMLElement,
    private _config: DragRefConfig,
    private _document: Document,
    private _ngZone: NgZone,
    private _viewportRuler: ViewportRuler,
    private _dragDropRegistry: DragDropRegistry,
    private _renderer: Renderer2,
  ) {
    this.withRootElement(element).withParent(_config.parentDragRef || null);
    this._parentPositions = new ParentPositionTracker(_document);
    _dragDropRegistry.registerDragItem(this);
  }

  /**
   * Returns the element that is being used as a placeholder