@vnmfify/core/index-list/index-list-anchor.js

```shell npm i @vnmfify/core -S ```

var _excluded = ["arrayedIndex", "index", "children", "className"];

function ownKeys(object, enumerableOnly) { var keys = Object.keys(object); if (Object.getOwnPropertySymbols) { var symbols = Object.getOwnPropertySymbols(object); if (enumerableOnly) { symbols = symbols.filter(function (sym) { return Object.getOwnPropertyDescriptor(object, sym).enumerable; }); } keys.push.apply(keys, symbols); } return keys; }

function _objectSpread(target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i] != null ? arguments[i] : {}; if (i % 2) { ownKeys(Object(source), true).forEach(function (key) { _defineProperty(target, key, source[key]); }); } else if (Object.getOwnPropertyDescriptors) { Object.defineProperties(target, Object.getOwnPropertyDescriptors(source)); } else { ownKeys(Object(source)).forEach(function (key) { Object.defineProperty(target, key, Object.getOwnPropertyDescriptor(source, key)); }); } } return target; }

function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }

function _objectWithoutProperties(source, excluded) { if (source == null) return {}; var target = _objectWithoutPropertiesLoose(source, excluded); var key, i; if (Object.getOwnPropertySymbols) { var sourceSymbolKeys = Object.getOwnPropertySymbols(source); for (i = 0; i < sourceSymbolKeys.length; i++) { key = sourceSymbolKeys[i]; if (excluded.indexOf(key) >= 0) continue; if (!Object.prototype.propertyIsEnumerable.call(source, key)) continue; target[key] = source[key]; } } return target; }

function _objectWithoutPropertiesLoose(source, excluded) { if (source == null) return {}; var target = {}; var sourceKeys = Object.keys(source); var key, i; for (i = 0; i < sourceKeys.length; i++) { key = sourceKeys[i]; if (excluded.indexOf(key) >= 0) continue; target[key] = source[key]; } return target; }

import { View } from "@vnxjs/components";
import { pageScrollTo } from "@vnxjs/vnmf";
import classNames from "classnames";
import * as React from "react";
import { forwardRef, useCallback, useContext, useImperativeHandle, useRef } from "react";
import { prefixClassname } from "../styles";
import { HAIRLINE_BORDER_BOTTOM } from "../styles/hairline";
import { getRect } from "../utils/dom/rect";
import { addUnitPx } from "../utils/format/unit";
import IndexListContext from "./index-list.context";
var IndexListAnchor = /*#__PURE__*/forwardRef((props, ref) => {
  var {
    arrayedIndex,
    index,
    children,
    className
  } = props,
      restProps = _objectWithoutProperties(props, _excluded);

  var {
    activeArrayedIndex,
    sticky: stickyProp,
    stickyOffsetTop,
    getAnchorRects,
    getListRect
  } = useContext(IndexListContext);
  var rootRef = useRef();
  var scrollIntoView = useCallback(scrollTop => getRect(rootRef).then(_ref => {
    var {
      top
    } = _ref;
    return pageScrollTo({
      duration: 0,
      scrollTop: Math.ceil(scrollTop + top)
    });
  }), []);
  useImperativeHandle(ref, () => ({
    scrollIntoView
  }));
  var wrapperStyle = {};
  var anchorStyle = {};
  var active = false;

  if (stickyProp) {
    if (arrayedIndex === activeArrayedIndex) {
      var {
        top,
        height
      } = getAnchorRects()[arrayedIndex];
      var activeAnchorSticky = top <= 0;

      if (activeAnchorSticky) {
        wrapperStyle = {
          height: addUnitPx(height)
        };
        anchorStyle = {
          position: "fixed",
          top: addUnitPx(stickyOffsetTop)
        };
      }

      active = true;
    } else if (arrayedIndex === activeArrayedIndex - 1) {
      var listRect = getListRect();
      var anchorRects = getAnchorRects();
      var currentAnchor = anchorRects[arrayedIndex];
      var currentOffsetTop = currentAnchor.top;
      var targetOffsetTop = arrayedIndex === anchorRects.length - 1 ? listRect.top : anchorRects[arrayedIndex + 1].top;
      var parentOffsetHeight = targetOffsetTop - currentOffsetTop;
      var translateY = parentOffsetHeight - currentAnchor.height;
      anchorStyle = {
        position: "relative",
        transform: "translate3d(0, ".concat(addUnitPx(translateY), ", 0)")
      };
      active = true;
    } else {
      wrapperStyle = {};
      anchorStyle = {};
      active = false;
    }
  }

  return /*#__PURE__*/React.createElement(View, _objectSpread({
    ref: rootRef,
    className: classNames(prefixClassname("index-list__anchor-wrapper"), className),
    style: wrapperStyle
  }, restProps), /*#__PURE__*/React.createElement(View, {
    className: classNames(prefixClassname("index-list__anchor"), {
      [prefixClassname("index-list__anchor--sticky")]: active,
      [HAIRLINE_BORDER_BOTTOM]: active
    }),
    style: anchorStyle,
    children: children !== null && children !== void 0 ? children : index
  }));
});
export default IndexListAnchor;
//# sourceMappingURL=index-list-anchor.js.map