Function destroyViewTree

packages/core/src/render3/node_manipulation.ts:251–288

(rootView: LView)

 *  @param rootView The view to destroy
 */
export function destroyViewTree(rootView: LView): void {
  // If the view has no children, we can clean it up and return early.
  let lViewOrLContainer = rootView[CHILD_HEAD];
  if (!lViewOrLContainer) {
    return cleanUpView(rootView[TVIEW], rootView);
  }

  while (lViewOrLContainer) {
    let next: LView | LContainer | null = null;

    if (isLView(lViewOrLContainer)) {
      // If LView, traverse down to child.
      next = lViewOrLContainer[CHILD_HEAD];
    } else {
      ngDevMode && assertLContainer(lViewOrLContainer);
      // If container, traverse down to its first LView.
      const firstView: LView | undefined = lViewOrLContainer[CONTAINER_HEADER_OFFSET];
      if (firstView) next = firstView;
    }

    if (!next) {
      // Only clean up view when moving to the side or up, as destroy hooks
      // should be called in order from the bottom up.
      while (lViewOrLContainer && !lViewOrLContainer![NEXT] && lViewOrLContainer !== rootView) {
        if (isLView(lViewOrLContainer)) {
          cleanUpView(lViewOrLContainer[TVIEW], lViewOrLContainer);
        }
        lViewOrLContainer = lViewOrLContainer[PARENT];
      }
      if (lViewOrLContainer === null) lViewOrLContainer = rootView;
      if (isLView(lViewOrLContainer)) {
        cleanUpView(lViewOrLContainer[TVIEW], lViewOrLContainer);
      }
      next = lViewOrLContainer && lViewOrLContainer![NEXT];
    }
    lViewOrLContainer = next;
  }
}

export function detachMovedView(declarationContainer: LContainer, lView: LView) {
  ngDevMode && assertLContainer(declarationContainer);