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Use update lane priority to set pending updates on roots #20918

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Merged
merged 1 commit into from
Mar 7, 2021
Merged

Use update lane priority to set pending updates on roots #20918

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21 changes: 21 additions & 0 deletions packages/react-reconciler/src/ReactFiberWorkLoop.new.js
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Original file line number Diff line number Diff line change
Expand Up @@ -597,6 +597,27 @@ export function scheduleUpdateOnFiber(
flushSyncCallbackQueue();
}
}
} else if (decoupleUpdatePriorityFromScheduler) {
const updateLanePriority = getCurrentUpdateLanePriority();

// Schedule a discrete update but only if it's not Sync.
if (
(executionContext & DiscreteEventContext) !== NoContext &&
// Only updates at user-blocking priority or greater are considered
// discrete, even inside a discrete event.
updateLanePriority === InputDiscreteLanePriority
) {
// This is the result of a discrete event. Track the lowest priority
// discrete update per root so we can flush them early, if needed.
if (rootsWithPendingDiscreteUpdates === null) {
rootsWithPendingDiscreteUpdates = new Set([root]);
} else {
rootsWithPendingDiscreteUpdates.add(root);
}
}
// Schedule other updates after in case the callback is sync.
ensureRootIsScheduled(root, eventTime);
schedulePendingInteractions(root, lane);
} else {
// Schedule a discrete update but only if it's not Sync.
if (
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21 changes: 21 additions & 0 deletions packages/react-reconciler/src/ReactFiberWorkLoop.old.js
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Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -597,6 +597,27 @@ export function scheduleUpdateOnFiber(
flushSyncCallbackQueue();
}
}
} else if (decoupleUpdatePriorityFromScheduler) {
const updateLanePriority = getCurrentUpdateLanePriority();

// Schedule a discrete update but only if it's not Sync.
if (
(executionContext & DiscreteEventContext) !== NoContext &&
// Only updates at user-blocking priority or greater are considered
// discrete, even inside a discrete event.
updateLanePriority === InputDiscreteLanePriority
) {
// This is the result of a discrete event. Track the lowest priority
// discrete update per root so we can flush them early, if needed.
if (rootsWithPendingDiscreteUpdates === null) {
rootsWithPendingDiscreteUpdates = new Set([root]);
} else {
rootsWithPendingDiscreteUpdates.add(root);
}
}
// Schedule other updates after in case the callback is sync.
ensureRootIsScheduled(root, eventTime);
schedulePendingInteractions(root, lane);
} else {
// Schedule a discrete update but only if it's not Sync.
if (
Expand Down