useMergeRef.js 1.9 KB

12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849
  1. "use strict";
  2. Object.defineProperty(exports, "__esModule", { value: true });
  3. exports.useMergeRefs = void 0;
  4. var tslib_1 = require("tslib");
  5. var React = tslib_1.__importStar(require("react"));
  6. var assignRef_1 = require("./assignRef");
  7. var useRef_1 = require("./useRef");
  8. var currentValues = new WeakMap();
  9. /**
  10. * Merges two or more refs together providing a single interface to set their value
  11. * @param {RefObject|Ref} refs
  12. * @returns {MutableRefObject} - a new ref, which translates all changes to {refs}
  13. *
  14. * @see {@link mergeRefs} a version without buit-in memoization
  15. * @see https://github.com/theKashey/use-callback-ref#usemergerefs
  16. * @example
  17. * const Component = React.forwardRef((props, ref) => {
  18. * const ownRef = useRef();
  19. * const domRef = useMergeRefs([ref, ownRef]); // 👈 merge together
  20. * return <div ref={domRef}>...</div>
  21. * }
  22. */
  23. function useMergeRefs(refs, defaultValue) {
  24. var callbackRef = (0, useRef_1.useCallbackRef)(defaultValue || null, function (newValue) {
  25. return refs.forEach(function (ref) { return (0, assignRef_1.assignRef)(ref, newValue); });
  26. });
  27. // handle refs changes - added or removed
  28. React.useLayoutEffect(function () {
  29. var oldValue = currentValues.get(callbackRef);
  30. if (oldValue) {
  31. var prevRefs_1 = new Set(oldValue);
  32. var nextRefs_1 = new Set(refs);
  33. var current_1 = callbackRef.current;
  34. prevRefs_1.forEach(function (ref) {
  35. if (!nextRefs_1.has(ref)) {
  36. (0, assignRef_1.assignRef)(ref, null);
  37. }
  38. });
  39. nextRefs_1.forEach(function (ref) {
  40. if (!prevRefs_1.has(ref)) {
  41. (0, assignRef_1.assignRef)(ref, current_1);
  42. }
  43. });
  44. }
  45. currentValues.set(callbackRef, refs);
  46. }, [refs]);
  47. return callbackRef;
  48. }
  49. exports.useMergeRefs = useMergeRefs;