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SlotFill: replace valtio with custom ObservableMap (#60879)
* SlotFill: replace valtio with custom ObservableMap * Fill PR number in changelog * Use Set for listeners Co-authored-by: jsnajdr <[email protected]> Co-authored-by: youknowriad <[email protected]> Co-authored-by: tyxla <[email protected]> Co-authored-by: ellatrix <[email protected]> Co-authored-by: Mamaduka <[email protected]> Co-authored-by: jeryj <[email protected]>
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78 changes: 78 additions & 0 deletions
78
packages/components/src/slot-fill/bubbles-virtually/observable-map.ts
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,78 @@ | ||
| /** | ||
| * WordPress dependencies | ||
| */ | ||
| import { useMemo, useSyncExternalStore } from '@wordpress/element'; | ||
|
|
||
| export type ObservableMap< K, V > = { | ||
| get( name: K ): V | undefined; | ||
| set( name: K, value: V ): void; | ||
| delete( name: K ): void; | ||
| subscribe( name: K, listener: () => void ): () => void; | ||
| }; | ||
|
|
||
| export function observableMap< K, V >(): ObservableMap< K, V > { | ||
| const map = new Map< K, V >(); | ||
| const listeners = new Map< K, Set< () => void > >(); | ||
|
|
||
| function callListeners( name: K ) { | ||
| const list = listeners.get( name ); | ||
| if ( ! list ) { | ||
| return; | ||
| } | ||
| for ( const listener of list ) { | ||
| listener(); | ||
| } | ||
| } | ||
|
|
||
| function unsubscribe( name: K, listener: () => void ) { | ||
| return () => { | ||
| const list = listeners.get( name ); | ||
| if ( ! list ) { | ||
| return; | ||
| } | ||
|
|
||
| list.delete( listener ); | ||
| if ( list.size === 0 ) { | ||
| listeners.delete( name ); | ||
| } | ||
| }; | ||
| } | ||
|
|
||
| return { | ||
| get( name ) { | ||
| return map.get( name ); | ||
| }, | ||
| set( name, value ) { | ||
| map.set( name, value ); | ||
| callListeners( name ); | ||
| }, | ||
| delete( name ) { | ||
| map.delete( name ); | ||
| callListeners( name ); | ||
| }, | ||
| subscribe( name, listener ) { | ||
| let list = listeners.get( name ); | ||
| if ( ! list ) { | ||
| list = new Set(); | ||
| listeners.set( name, list ); | ||
| } | ||
| list.add( listener ); | ||
|
|
||
| return unsubscribe( name, listener ); | ||
| }, | ||
| }; | ||
| } | ||
|
|
||
| export function useObservableValue< K, V >( | ||
| map: ObservableMap< K, V >, | ||
| name: K | ||
| ): V | undefined { | ||
| const [ subscribe, getValue ] = useMemo( | ||
| () => [ | ||
| ( listener: () => void ) => map.subscribe( name, listener ), | ||
| () => map.get( name ), | ||
| ], | ||
| [ map, name ] | ||
| ); | ||
| return useSyncExternalStore( subscribe, getValue ); | ||
| } |
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