Function applyContainer

packages/core/src/render3/node_manipulation.ts:1058–1098

* `applyContainer` performs an operation on the container and its views as specified by * `action` (insert, detach, destroy) * * Inserting a Container is complicated by the fact that the container may have Views which * themselves have containers or projections. * * @param renderer Renderer to

(
  renderer: Renderer,
  action: WalkTNodeTreeAction,
  injector: Injector,
  lContainer: LContainer,
  tNode: TNode,
  parentRElement: RElement | null,
  beforeNode: RNode | null | undefined,
)

 * @param beforeNode Before which node the insertions should happen.
 */
function applyContainer(
  renderer: Renderer,
  action: WalkTNodeTreeAction,
  injector: Injector,
  lContainer: LContainer,
  tNode: TNode,
  parentRElement: RElement | null,
  beforeNode: RNode | null | undefined,
) {
  ngDevMode && assertLContainer(lContainer);
  const anchor = lContainer[NATIVE]; // LContainer has its own before node.
  const native = unwrapRNode(lContainer);
  // An LContainer can be created dynamically on any node by injecting ViewContainerRef.
  // Asking for a ViewContainerRef on an element will result in a creation of a separate anchor
  // node (comment in the DOM) that will be different from the LContainer's host node. In this
  // particular case we need to execute action on 2 nodes:
  // - container's host node (this is done in the executeActionOnElementOrContainer)
  // - container's host node (this is done here)
  if (anchor !== native) {
    // This is very strange to me (Misko). I would expect that the native is same as anchor. I
    // don't see a reason why they should be different, but they are.
    //
    // If they are we need to process the second anchor as well.
    applyToElementOrContainer(
      action,
      renderer,
      injector,
      parentRElement,
      anchor,
      tNode,
      beforeNode,
    );
  }
  if ((lContainer[FLAGS] & LContainerFlags.LogicalOnly) !== 0) {
    return;
  }
  for (let i = CONTAINER_HEADER_OFFSET; i < lContainer.length; i++) {
    const lView = lContainer[i] as LView;
    applyView(lView[TVIEW], lView, renderer, action, parentRElement, anchor);
  }
}

/**
 * Writes class/style to element.