hideOrUnhideAllChildrenOnFiber() — react Function Reference

Source Code

packages/react-reconciler/src/ReactFiberCommitWork.js lines 1196–1241

function hideOrUnhideAllChildrenOnFiber(fiber: Fiber, isHidden: boolean) {
  if (!supportsMutation) {
    return;
  }
  switch (fiber.tag) {
    case HostComponent:
    case HostHoistable: {
      // Found the nearest host component. Hide it.
      commitShowHideHostInstance(fiber, isHidden);
      // Typically, only the nearest host nodes need to be hidden, since that
      // has the effect of also hiding everything inside of them.
      //
      // However, there's a special case for portals, because portals do not
      // exist in the regular host tree hierarchy; we can't assume that just
      // because a portal's HostComponent parent in the React tree will also be
      // a parent in the actual host tree.
      //
      // So, if any portals exist within the tree, regardless of how deeply
      // nested they are, we need to repeat this algorithm for its children.
      hideOrUnhideNearestPortals(fiber, isHidden);
      return;
    }
    case HostText: {
      commitShowHideHostTextInstance(fiber, isHidden);
      return;
    }
    case DehydratedFragment: {
      commitShowHideSuspenseBoundary(fiber, isHidden);
      return;
    }
    case OffscreenComponent:
    case LegacyHiddenComponent: {
      const offscreenState: OffscreenState | null = fiber.memoizedState;
      if (offscreenState !== null) {
        // Found a nested Offscreen component that is hidden.
        // Don't search any deeper. This tree should remain hidden.
      } else {
        hideOrUnhideAllChildren(fiber, isHidden);
      }
      return;
    }
    default: {
      hideOrUnhideAllChildren(fiber, isHidden);
      return;
    }
  }