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Add separate ChildDeletion flag #20264

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Nov 16, 2020
Merged

Add separate ChildDeletion flag #20264

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59 changes: 33 additions & 26 deletions packages/react-reconciler/src/ReactFiberFlags.js
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Original file line number Diff line number Diff line change
Expand Up @@ -12,48 +12,49 @@ import {enableCreateEventHandleAPI} from 'shared/ReactFeatureFlags';
export type Flags = number;

// Don't change these two values. They're used by React Dev Tools.
export const NoFlags = /* */ 0b0000000000000000000;
export const PerformedWork = /* */ 0b0000000000000000001;
export const NoFlags = /* */ 0b00000000000000000000;
export const PerformedWork = /* */ 0b00000000000000000001;

// You can change the rest (and add more).
export const Placement = /* */ 0b0000000000000000010;
export const Update = /* */ 0b0000000000000000100;
export const PlacementAndUpdate = /* */ 0b0000000000000000110;
export const Deletion = /* */ 0b0000000000000001000;
export const ContentReset = /* */ 0b0000000000000010000;
export const Callback = /* */ 0b0000000000000100000;
export const DidCapture = /* */ 0b0000000000001000000;
export const Ref = /* */ 0b0000000000010000000;
export const Snapshot = /* */ 0b0000000000100000000;
export const Passive = /* */ 0b0000000001000000000;
export const Hydrating = /* */ 0b0000000010000000000;
export const HydratingAndUpdate = /* */ 0b0000000010000000100;
export const Visibility = /* */ 0b0000000100000000000;
export const Placement = /* */ 0b00000000000000000010;
export const Update = /* */ 0b00000000000000000100;
export const PlacementAndUpdate = /* */ Placement | Update;
export const Deletion = /* */ 0b00000000000000001000;
export const ChildDeletion = /* */ 0b00000000000000010000;
export const ContentReset = /* */ 0b00000000000000100000;
export const Callback = /* */ 0b00000000000001000000;
export const DidCapture = /* */ 0b00000000000010000000;
export const Ref = /* */ 0b00000000000100000000;
export const Snapshot = /* */ 0b00000000001000000000;
export const Passive = /* */ 0b00000000010000000000;
export const Hydrating = /* */ 0b00000000100000000000;
export const HydratingAndUpdate = /* */ Hydrating | Update;
export const Visibility = /* */ 0b00000001000000000000;

export const LifecycleEffectMask = Passive | Update | Callback | Ref | Snapshot;

// Union of all commit flags (flags with the lifetime of a particular commit)
export const HostEffectMask = /* */ 0b0000000111111111111;
export const HostEffectMask = /* */ 0b00000001111111111111;

// These are not really side effects, but we still reuse this field.
export const Incomplete = /* */ 0b0000001000000000000;
export const ShouldCapture = /* */ 0b0000010000000000000;
export const Incomplete = /* */ 0b00000010000000000000;
export const ShouldCapture = /* */ 0b00000100000000000000;
// TODO (effects) Remove this bit once the new reconciler is synced to the old.
export const PassiveUnmountPendingDev = /* */ 0b0000100000000000000;
export const ForceUpdateForLegacySuspense = /* */ 0b0001000000000000000;
export const PassiveUnmountPendingDev = /* */ 0b00001000000000000000;
export const ForceUpdateForLegacySuspense = /* */ 0b00010000000000000000;

// Static tags describe aspects of a fiber that are not specific to a render,
// e.g. a fiber uses a passive effect (even if there are no updates on this particular render).
// This enables us to defer more work in the unmount case,
// since we can defer traversing the tree during layout to look for Passive effects,
// and instead rely on the static flag as a signal that there may be cleanup work.
export const PassiveStatic = /* */ 0b0010000000000000000;
export const PassiveStatic = /* */ 0b00100000000000000000;

// These flags allow us to traverse to fibers that have effects on mount
// without traversing the entire tree after every commit for
// double invoking
export const MountLayoutDev = /* */ 0b0100000000000000000;
export const MountPassiveDev = /* */ 0b1000000000000000000;
export const MountLayoutDev = /* */ 0b01000000000000000000;
export const MountPassiveDev = /* */ 0b10000000000000000000;

// Groups of flags that are used in the commit phase to skip over trees that
// don't contain effects, by checking subtreeFlags.
Expand All @@ -65,13 +66,19 @@ export const BeforeMutationMask =
// fire beforeblur
// TODO: Only need to visit Deletions during BeforeMutation phase if an
// element is focused.
Deletion | Visibility
ChildDeletion | Visibility
: 0);

export const MutationMask =
Placement | Update | Deletion | ContentReset | Ref | Hydrating | Visibility;
Placement |
Update |
ChildDeletion |
ContentReset |
Ref |
Hydrating |
Visibility;
export const LayoutMask = Update | Callback | Ref;
export const PassiveMask = Passive | Deletion;
export const PassiveMask = Passive | ChildDeletion;

// Union of tags that don't get reset on clones.
// This allows certain concepts to persist without recalculting them,
Expand Down