44 lines
1.7 KiB
JavaScript
44 lines
1.7 KiB
JavaScript
import * as React from 'react';
|
|
import { assignRef } from './assignRef';
|
|
import { useCallbackRef } from './useRef';
|
|
const useIsomorphicLayoutEffect = typeof window !== 'undefined' ? React.useLayoutEffect : React.useEffect;
|
|
const currentValues = new WeakMap();
|
|
/**
|
|
* Merges two or more refs together providing a single interface to set their value
|
|
* @param {RefObject|Ref} refs
|
|
* @returns {MutableRefObject} - a new ref, which translates all changes to {refs}
|
|
*
|
|
* @see {@link mergeRefs} a version without buit-in memoization
|
|
* @see https://github.com/theKashey/use-callback-ref#usemergerefs
|
|
* @example
|
|
* const Component = React.forwardRef((props, ref) => {
|
|
* const ownRef = useRef();
|
|
* const domRef = useMergeRefs([ref, ownRef]); // 👈 merge together
|
|
* return <div ref={domRef}>...</div>
|
|
* }
|
|
*/
|
|
export function useMergeRefs(refs, defaultValue) {
|
|
const callbackRef = useCallbackRef(defaultValue || null, (newValue) => refs.forEach((ref) => assignRef(ref, newValue)));
|
|
// handle refs changes - added or removed
|
|
useIsomorphicLayoutEffect(() => {
|
|
const oldValue = currentValues.get(callbackRef);
|
|
if (oldValue) {
|
|
const prevRefs = new Set(oldValue);
|
|
const nextRefs = new Set(refs);
|
|
const current = callbackRef.current;
|
|
prevRefs.forEach((ref) => {
|
|
if (!nextRefs.has(ref)) {
|
|
assignRef(ref, null);
|
|
}
|
|
});
|
|
nextRefs.forEach((ref) => {
|
|
if (!prevRefs.has(ref)) {
|
|
assignRef(ref, current);
|
|
}
|
|
});
|
|
}
|
|
currentValues.set(callbackRef, refs);
|
|
}, [refs]);
|
|
return callbackRef;
|
|
}
|