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Land forked reconciler changes (#24878)
This applies forked changes from the "new" reconciler to the "old" one. Includes: - 67de5e3 [FORKED] Hidden trees should capture Suspense - 6ab05ee [FORKED] Track nearest Suspense handler on stack - 051ac55 [FORKED] Add HiddenContext to track if subtree is hidden
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359 changes: 223 additions & 136 deletions
359
packages/react-reconciler/src/ReactFiberBeginWork.old.js
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71 changes: 70 additions & 1 deletion
71
packages/react-reconciler/src/ReactFiberHiddenContext.old.js
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1 +1,70 @@ | ||
| // Intentionally blank. File only exists in new reconciler fork. | ||
| /** | ||
| * Copyright (c) Facebook, Inc. and its affiliates. | ||
| * | ||
| * This source code is licensed under the MIT license found in the | ||
| * LICENSE file in the root directory of this source tree. | ||
| * | ||
| * @flow | ||
| */ | ||
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| import type {Fiber} from './ReactInternalTypes'; | ||
| import type {StackCursor} from './ReactFiberStack.old'; | ||
| import type {Lanes} from './ReactFiberLane.old'; | ||
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| import {createCursor, push, pop} from './ReactFiberStack.old'; | ||
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| import {getRenderLanes, setRenderLanes} from './ReactFiberWorkLoop.old'; | ||
| import {NoLanes, mergeLanes} from './ReactFiberLane.old'; | ||
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| // TODO: Remove `renderLanes` context in favor of hidden context | ||
| type HiddenContext = { | ||
| // Represents the lanes that must be included when processing updates in | ||
| // order to reveal the hidden content. | ||
| // TODO: Remove `subtreeLanes` context from work loop in favor of this one. | ||
| baseLanes: number, | ||
| }; | ||
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| // TODO: This isn't being used yet, but it's intended to replace the | ||
| // InvisibleParentContext that is currently managed by SuspenseContext. | ||
| export const currentTreeHiddenStackCursor: StackCursor<HiddenContext | null> = createCursor( | ||
| null, | ||
| ); | ||
| export const prevRenderLanesStackCursor: StackCursor<Lanes> = createCursor( | ||
| NoLanes, | ||
| ); | ||
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| export function pushHiddenContext(fiber: Fiber, context: HiddenContext): void { | ||
| const prevRenderLanes = getRenderLanes(); | ||
| push(prevRenderLanesStackCursor, prevRenderLanes, fiber); | ||
| push(currentTreeHiddenStackCursor, context, fiber); | ||
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| // When rendering a subtree that's currently hidden, we must include all | ||
| // lanes that would have rendered if the hidden subtree hadn't been deferred. | ||
| // That is, in order to reveal content from hidden -> visible, we must commit | ||
| // all the updates that we skipped when we originally hid the tree. | ||
| setRenderLanes(mergeLanes(prevRenderLanes, context.baseLanes)); | ||
| } | ||
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| export function reuseHiddenContextOnStack(fiber: Fiber): void { | ||
| // This subtree is not currently hidden, so we don't need to add any lanes | ||
| // to the render lanes. But we still need to push something to avoid a | ||
| // context mismatch. Reuse the existing context on the stack. | ||
| push(prevRenderLanesStackCursor, getRenderLanes(), fiber); | ||
| push( | ||
| currentTreeHiddenStackCursor, | ||
| currentTreeHiddenStackCursor.current, | ||
| fiber, | ||
| ); | ||
| } | ||
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| export function popHiddenContext(fiber: Fiber): void { | ||
| // Restore the previous render lanes from the stack | ||
| setRenderLanes(prevRenderLanesStackCursor.current); | ||
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| pop(currentTreeHiddenStackCursor, fiber); | ||
| pop(prevRenderLanesStackCursor, fiber); | ||
| } | ||
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| export function isCurrentTreeHidden() { | ||
| return currentTreeHiddenStackCursor.current !== null; | ||
| } |
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