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Remove dependence on VirtualizedList
listKey prop
Summary: Following up on the previous diff to remove the only usage of `listKey` for persistent association, we can remove the need for a manual `listKey`, and instead rely on per-instance association via refs. A followup change will remove the existing usages. Changelog: [General][Removed] - Remove VirtualizedList `listKey` prop Reviewed By: p-sun Differential Revision: D39466677 fbshipit-source-id: 6b49f45c987fff9836918ba833fbb16f24414ff8
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,72 @@ | ||
| /** | ||
| * Copyright (c) Meta Platforms, Inc. and affiliates. | ||
| * | ||
| * This source code is licensed under the MIT license found in the | ||
| * LICENSE file in the root directory of this source tree. | ||
| * | ||
| * @flow strict | ||
| * @format | ||
| */ | ||
|
|
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| import invariant from 'invariant'; | ||
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| export default class ChildListCollection<TList> { | ||
| _cellKeyToChildren: Map<string, Set<TList>> = new Map(); | ||
| _childrenToCellKey: Map<TList, string> = new Map(); | ||
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| add(list: TList, cellKey: string): void { | ||
| invariant( | ||
| !this._childrenToCellKey.has(list), | ||
| 'Trying to add already present child list', | ||
| ); | ||
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| const cellLists = this._cellKeyToChildren.get(cellKey) ?? new Set(); | ||
| cellLists.add(list); | ||
| this._cellKeyToChildren.set(cellKey, cellLists); | ||
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| this._childrenToCellKey.set(list, cellKey); | ||
| } | ||
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| remove(list: TList): void { | ||
| const cellKey = this._childrenToCellKey.get(list); | ||
| invariant(cellKey != null, 'Trying to remove non-present child list'); | ||
| this._childrenToCellKey.delete(list); | ||
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| const cellLists = this._cellKeyToChildren.get(cellKey); | ||
| invariant(cellLists, '_cellKeyToChildren should contain cellKey'); | ||
| cellLists.delete(list); | ||
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| if (cellLists.size === 0) { | ||
| this._cellKeyToChildren.delete(cellKey); | ||
| } | ||
| } | ||
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| forEach(fn: TList => void): void { | ||
| for (const listSet of this._cellKeyToChildren.values()) { | ||
| for (const list of listSet) { | ||
| fn(list); | ||
| } | ||
| } | ||
| } | ||
|
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| forEachInCell(cellKey: string, fn: TList => void): void { | ||
| const listSet = this._cellKeyToChildren.get(cellKey) ?? []; | ||
| for (const list of listSet) { | ||
| fn(list); | ||
| } | ||
| } | ||
|
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| anyInCell(cellKey: string, fn: TList => boolean): boolean { | ||
| const listSet = this._cellKeyToChildren.get(cellKey) ?? []; | ||
| for (const list of listSet) { | ||
| if (fn(list)) { | ||
| return true; | ||
| } | ||
| } | ||
| return false; | ||
| } | ||
|
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| size(): number { | ||
| return this._childrenToCellKey.size; | ||
| } | ||
| } |
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