restoreViewTransitionsOnFiber() — react Function Reference

Source Code

packages/react-reconciler/src/ReactFiberApplyGesture.js lines 1288–1326

function restoreViewTransitionsOnFiber(finishedWork: Fiber) {
  const current = finishedWork.alternate;
  if (current === null) {
    restoreEnterOrExitViewTransitions(finishedWork);
    return;
  }

  const flags = finishedWork.flags;
  // The effect flag should be checked *after* we refine the type of fiber,
  // because the fiber tag is more specific. An exception is any flag related
  // to reconciliation, because those can be set on all fiber types.
  switch (finishedWork.tag) {
    case HostPortal: {
      // TODO: Consider what should happen to Portals. For now we exclude them.
      break;
    }
    case OffscreenComponent: {
      if (flags & Visibility) {
        const newState: OffscreenState | null = finishedWork.memoizedState;
        const isHidden = newState !== null;
        if (!isHidden) {
          restoreEnterOrExitViewTransitions(finishedWork);
        } else if (current !== null && current.memoizedState === null) {
          // Was previously mounted as visible but is now hidden.
          restoreEnterOrExitViewTransitions(current);
        }
      }
      break;
    }
    case ViewTransitionComponent:
      restoreUpdateViewTransitionForGesture(current, finishedWork);
      recursivelyRestoreViewTransitions(finishedWork);
      break;
    default: {
      recursivelyRestoreViewTransitions(finishedWork);
      break;
    }
  }
}