Function createViewRef

packages/core/src/change_detection/change_detector_ref.ts:138–154

* Creates a ViewRef and stores it on the injector as ChangeDetectorRef (public alias). * * @param tNode The node that is requesting a ChangeDetectorRef * @param lView The view to which the node belongs * @param isPipe Whether the view is being injected into a pipe. * @returns The ChangeDetector

(tNode: TNode, lView: LView, isPipe: boolean)

 * @returns The ChangeDetectorRef to use
 */
function createViewRef(tNode: TNode, lView: LView, isPipe: boolean): ChangeDetectorRef {
  if (isComponentHost(tNode) && !isPipe) {
    // The LView represents the location where the component is declared.
    // Instead we want the LView for the component View and so we need to look it up.
    const componentView = getComponentLViewByIndex(tNode.index, lView); // look down
    return new ViewRef(componentView, componentView);
  } else if (
    tNode.type &
    (TNodeType.AnyRNode | TNodeType.AnyContainer | TNodeType.Icu | TNodeType.LetDeclaration)
  ) {
    // The LView represents the location where the injection is requested from.
    // We need to locate the containing LView (in case where the `lView` is an embedded view)
    const hostComponentView = lView[DECLARATION_COMPONENT_VIEW]; // look up
    return new ViewRef(hostComponentView, lView);
  }
  return null!;
}