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Offscreen: Use JS stack to track hidden/unhidden subtree state #21195

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Offscreen: Use JS stack to track hidden/unhidden subtree state #21195

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51 changes: 28 additions & 23 deletions packages/react-reconciler/src/ReactFiberCommitWork.new.js
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Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -156,9 +156,7 @@ if (__DEV__) {
// Allows us to avoid traversing the return path to find the nearest Offscreen ancestor.
// Only used when enableSuspenseLayoutEffectSemantics is enabled.
let offscreenSubtreeIsHidden: boolean = false;
const offscreenSubtreeIsHiddenStack: Array<boolean> = [];
let offscreenSubtreeWasHidden: boolean = false;
const offscreenSubtreeWasHiddenStack: Array<boolean> = [];

const PossiblyWeakSet = typeof WeakSet === 'function' ? WeakSet : Set;

Expand Down Expand Up @@ -2305,11 +2303,35 @@ function commitLayoutEffects_begin(
const wasHidden = current !== null && current.memoizedState !== null;
const isHidden = fiber.memoizedState !== null;

offscreenSubtreeWasHidden = wasHidden || offscreenSubtreeWasHidden;
offscreenSubtreeIsHidden = isHidden || offscreenSubtreeIsHidden;
const newOffscreenSubtreeIsHidden =
isHidden || offscreenSubtreeIsHidden;
const newOffscreenSubtreeWasHidden =
wasHidden || offscreenSubtreeWasHidden;

offscreenSubtreeWasHiddenStack.push(wasHidden);
offscreenSubtreeIsHiddenStack.push(isHidden);
if (
newOffscreenSubtreeIsHidden !== offscreenSubtreeIsHidden ||
newOffscreenSubtreeWasHidden !== offscreenSubtreeWasHidden
) {
const prevOffscreenSubtreeIsHidden = offscreenSubtreeIsHidden;
const prevOffscreenSubtreeWasHidden = offscreenSubtreeWasHidden;

nextEffect = fiber;
offscreenSubtreeIsHidden = newOffscreenSubtreeIsHidden;
offscreenSubtreeWasHidden = newOffscreenSubtreeWasHidden;

// Traverse the Offscreen subtree with the current Offscreen as the root.
commitLayoutEffects_begin(
fiber, // New root; bubble back up to here and stop.
root,
committedLanes,
);

nextEffect = fiber.sibling;
offscreenSubtreeIsHidden = prevOffscreenSubtreeIsHidden;
offscreenSubtreeWasHidden = prevOffscreenSubtreeWasHidden;

continue;
}
}
}

Expand Down Expand Up @@ -2350,23 +2372,6 @@ function commitLayoutMountEffects_complete(
while (nextEffect !== null) {
const fiber = nextEffect;

if (enableSuspenseLayoutEffectSemantics && isModernRoot) {
if (fiber.tag === OffscreenComponent) {
offscreenSubtreeWasHiddenStack.pop();
offscreenSubtreeIsHiddenStack.pop();
offscreenSubtreeWasHidden =
offscreenSubtreeWasHiddenStack.length > 0 &&
offscreenSubtreeWasHiddenStack[
offscreenSubtreeWasHiddenStack.length - 1
];
offscreenSubtreeIsHidden =
offscreenSubtreeIsHiddenStack.length > 0 &&
offscreenSubtreeIsHiddenStack[
offscreenSubtreeIsHiddenStack.length - 1
];
}
}

if (
enableSuspenseLayoutEffectSemantics &&
isModernRoot &&
Expand Down
51 changes: 28 additions & 23 deletions packages/react-reconciler/src/ReactFiberCommitWork.old.js
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -156,9 +156,7 @@ if (__DEV__) {
// Allows us to avoid traversing the return path to find the nearest Offscreen ancestor.
// Only used when enableSuspenseLayoutEffectSemantics is enabled.
let offscreenSubtreeIsHidden: boolean = false;
const offscreenSubtreeIsHiddenStack: Array<boolean> = [];
let offscreenSubtreeWasHidden: boolean = false;
const offscreenSubtreeWasHiddenStack: Array<boolean> = [];

const PossiblyWeakSet = typeof WeakSet === 'function' ? WeakSet : Set;

Expand Down Expand Up @@ -2305,11 +2303,35 @@ function commitLayoutEffects_begin(
const wasHidden = current !== null && current.memoizedState !== null;
const isHidden = fiber.memoizedState !== null;

offscreenSubtreeWasHidden = wasHidden || offscreenSubtreeWasHidden;
offscreenSubtreeIsHidden = isHidden || offscreenSubtreeIsHidden;
const newOffscreenSubtreeIsHidden =
isHidden || offscreenSubtreeIsHidden;
const newOffscreenSubtreeWasHidden =
wasHidden || offscreenSubtreeWasHidden;

offscreenSubtreeWasHiddenStack.push(wasHidden);
offscreenSubtreeIsHiddenStack.push(isHidden);
if (
newOffscreenSubtreeIsHidden !== offscreenSubtreeIsHidden ||
newOffscreenSubtreeWasHidden !== offscreenSubtreeWasHidden
) {
const prevOffscreenSubtreeIsHidden = offscreenSubtreeIsHidden;
const prevOffscreenSubtreeWasHidden = offscreenSubtreeWasHidden;

nextEffect = fiber;
offscreenSubtreeIsHidden = newOffscreenSubtreeIsHidden;
offscreenSubtreeWasHidden = newOffscreenSubtreeWasHidden;

// Traverse the Offscreen subtree with the current Offscreen as the root.
commitLayoutEffects_begin(
fiber, // New root; bubble back up to here and stop.
root,
committedLanes,
);

nextEffect = fiber.sibling;
offscreenSubtreeIsHidden = prevOffscreenSubtreeIsHidden;
offscreenSubtreeWasHidden = prevOffscreenSubtreeWasHidden;

continue;
}
}
}

Expand Down Expand Up @@ -2350,23 +2372,6 @@ function commitLayoutMountEffects_complete(
while (nextEffect !== null) {
const fiber = nextEffect;

if (enableSuspenseLayoutEffectSemantics && isModernRoot) {
if (fiber.tag === OffscreenComponent) {
offscreenSubtreeWasHiddenStack.pop();
offscreenSubtreeIsHiddenStack.pop();
offscreenSubtreeWasHidden =
offscreenSubtreeWasHiddenStack.length > 0 &&
offscreenSubtreeWasHiddenStack[
offscreenSubtreeWasHiddenStack.length - 1
];
offscreenSubtreeIsHidden =
offscreenSubtreeIsHiddenStack.length > 0 &&
offscreenSubtreeIsHiddenStack[
offscreenSubtreeIsHiddenStack.length - 1
];
}
}

if (
enableSuspenseLayoutEffectSemantics &&
isModernRoot &&
Expand Down