bc518174
 王天杨
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import * as React from 'react';
import { assignRef } from './assignRef';
import { useCallbackRef } from './useRef';
var useIsomorphicLayoutEffect = typeof window !== 'undefined' ? React.useLayoutEffect : React.useEffect;
var 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) {
var callbackRef = useCallbackRef(defaultValue || null, function (newValue) {
return refs.forEach(function (ref) { return assignRef(ref, newValue); });
});
// handle refs changes - added or removed
useIsomorphicLayoutEffect(function () {
var oldValue = currentValues.get(callbackRef);
if (oldValue) {
var prevRefs_1 = new Set(oldValue);
var nextRefs_1 = new Set(refs);
var current_1 = callbackRef.current;
prevRefs_1.forEach(function (ref) {
if (!nextRefs_1.has(ref)) {
assignRef(ref, null);
}
});
nextRefs_1.forEach(function (ref) {
if (!prevRefs_1.has(ref)) {
assignRef(ref, current_1);
}
});
}
currentValues.set(callbackRef, refs);
}, [refs]);
return callbackRef;
}
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