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frontend/node_modules/rc-virtual-list/lib/hooks/useDiffItem.js

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+"use strict";
+
+var _interopRequireWildcard = require("@babel/runtime/helpers/interopRequireWildcard").default;
+var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault").default;
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = useDiffItem;
+var _slicedToArray2 = _interopRequireDefault(require("@babel/runtime/helpers/slicedToArray"));
+var React = _interopRequireWildcard(require("react"));
+var _algorithmUtil = require("../utils/algorithmUtil");
+function useDiffItem(data, getKey, onDiff) {
+  var _React$useState = React.useState(data),
+    _React$useState2 = (0, _slicedToArray2.default)(_React$useState, 2),
+    prevData = _React$useState2[0],
+    setPrevData = _React$useState2[1];
+  var _React$useState3 = React.useState(null),
+    _React$useState4 = (0, _slicedToArray2.default)(_React$useState3, 2),
+    diffItem = _React$useState4[0],
+    setDiffItem = _React$useState4[1];
+  React.useEffect(function () {
+    var diff = (0, _algorithmUtil.findListDiffIndex)(prevData || [], data || [], getKey);
+    if ((diff === null || diff === void 0 ? void 0 : diff.index) !== undefined) {
+      onDiff === null || onDiff === void 0 || onDiff(diff.index);
+      setDiffItem(data[diff.index]);
+    }
+    setPrevData(data);
+  }, [data]);
+  return [diffItem];
+}