Function markViewDirty

packages/core/src/render3/instructions/mark_view_dirty.ts:26–52

(lView: LView, source: NotificationSource)

 * @returns the root LView
 */
export function markViewDirty(lView: LView, source: NotificationSource): LView | null {
  const dirtyBitsToUse = isRefreshingViews()
    ? // When we are actively refreshing views, we only use the `Dirty` bit to mark a view
      // for check. This bit is ignored in ChangeDetectionMode.Targeted, which is used to
      // synchronously rerun change detection on a specific set of views (those which have
      // the `RefreshView` flag and those with dirty signal consumers). `LViewFlags.Dirty`
      // does not support re-entrant change detection on its own.
      LViewFlags.Dirty
    : // When we are not actively refreshing a view tree, it is absolutely
      // valid to update state and mark views dirty. We use the `RefreshView` flag in this
      // case to allow synchronously rerunning change detection. This applies today to
      // afterRender hooks as well as animation listeners which execute after detecting
      // changes in a view when the render factory flushes.
      LViewFlags.RefreshView | LViewFlags.Dirty;
  lView[ENVIRONMENT].changeDetectionScheduler?.notify(source);
  while (lView) {
    lView[FLAGS] |= dirtyBitsToUse;
    const parent = getLViewParent(lView);
    // Stop traversing up as soon as you find a root view that wasn't attached to any container
    if (isRootView(lView) && !parent) {
      return lView;
    }
    // continue otherwise
    lView = parent!;
  }
  return null;
}