linkmore-design/es/lm-table/virTual/VirtualWrapper.js

🌈 🚀lm组件库。🚀

import _objectWithoutProperties from "@babel/runtime/helpers/esm/objectWithoutProperties";
var _excluded = ["children"];
import React, { useEffect, useMemo } from 'react';
import { useStore } from "./context";
var VirtualWrapper = /*#__PURE__*/React.memo(function (wrapperProps) {
  var _virtualItems$, _virtualItems;
  var _ref = wrapperProps,
    children = _ref.children,
    resetProps = _objectWithoutProperties(_ref, _excluded);
  var _useStore = useStore(),
    state = _useStore.state,
    dispatch = _useStore.dispatch,
    instance = _useStore.instance;
  var _instance$rowVirtual = instance.rowVirtual,
    _instance$rowVirtual$ = _instance$rowVirtual.virtualItems,
    virtualItems = _instance$rowVirtual$ === void 0 ? [] : _instance$rowVirtual$,
    totalSize = _instance$rowVirtual.totalSize;
  var contents = useMemo(function () {
    return children[1];
  }, [children]);
  var contentsLen = useMemo(function () {
    var _contents$length;
    return (_contents$length = contents === null || contents === void 0 ? void 0 : contents.length) !== null && _contents$length !== void 0 ? _contents$length : 0;
  }, [contents]);
  useEffect(function () {
    if (state.totalLen !== contentsLen) {
      dispatch({
        type: 'changeTotalLen',
        totalLen: contentsLen !== null && contentsLen !== void 0 ? contentsLen : 0
      });
    }
  }, [contentsLen, dispatch, state.totalLen]);
  var paddingTop = (virtualItems === null || virtualItems === void 0 ? void 0 : virtualItems.length) > 0 ? (virtualItems === null || virtualItems === void 0 ? void 0 : (_virtualItems$ = virtualItems[0]) === null || _virtualItems$ === void 0 ? void 0 : _virtualItems$.start) || 0 : 0;
  var paddingBottom = (virtualItems === null || virtualItems === void 0 ? void 0 : virtualItems.length) > 0 ? totalSize - ((virtualItems === null || virtualItems === void 0 ? void 0 : (_virtualItems = virtualItems[(virtualItems === null || virtualItems === void 0 ? void 0 : virtualItems.length) - 1]) === null || _virtualItems === void 0 ? void 0 : _virtualItems.end) || 0) : 0;
  return /*#__PURE__*/React.createElement("tbody", resetProps, paddingTop > 0 && /*#__PURE__*/React.createElement("tr", null, /*#__PURE__*/React.createElement("td", {
    style: {
      height: "".concat(paddingTop, "px")
    }
  })), children[0], virtualItems === null || virtualItems === void 0 ? void 0 : virtualItems.map(function (virtualRow) {
    return contents[virtualRow.index];
  }), paddingBottom > 0 && /*#__PURE__*/React.createElement("tr", null, /*#__PURE__*/React.createElement("td", {
    style: {
      height: "".concat(paddingBottom, "px")
    }
  })));
});
export default VirtualWrapper;