tdesign-react/lib/affix/Affix.js

TDesign Component for React

/**
 * tdesign v1.16.2
 * (c) 2025 tdesign
 * @license MIT
 */

import React, { forwardRef, useRef, useCallback, useImperativeHandle, useEffect } from 'react';
import { isFunction } from 'lodash-es';
import useConfig from '../hooks/useConfig.js';
import { affixDefaultProps } from './defaultProps.js';
import useDefaultProps from '../hooks/useDefaultProps.js';
import { getScrollContainer } from '../_util/scroll.js';
import '../config-provider/ConfigContext.js';
import '../_chunks/dep-d67deb2c.js';
import '../_chunks/dep-8abcbcbc.js';
import '../_chunks/dep-6b235a32.js';
import '../_chunks/dep-b9afa32b.js';
import 'dayjs';
import 'raf';
import '../_chunks/dep-ca8d3fa0.js';
import '../_util/easing.js';

var Affix = /*#__PURE__*/forwardRef(function (props, ref) {
  var _useDefaultProps = useDefaultProps(props, affixDefaultProps),
    children = _useDefaultProps.children,
    content = _useDefaultProps.content,
    zIndex = _useDefaultProps.zIndex,
    container = _useDefaultProps.container,
    offsetBottom = _useDefaultProps.offsetBottom,
    offsetTop = _useDefaultProps.offsetTop,
    className = _useDefaultProps.className,
    style = _useDefaultProps.style,
    onFixedChange = _useDefaultProps.onFixedChange;
  var _useConfig = useConfig(),
    classPrefix = _useConfig.classPrefix;
  var affixRef = useRef(null);
  var affixWrapRef = useRef(null);
  var placeholderEL = useRef(null);
  var scrollContainer = useRef(null);
  var ticking = useRef(false);
  var handleScroll = useCallback(function () {
    if (!ticking.current) {
      window.requestAnimationFrame(function () {
        var _affixWrapRef$current, _affixWrapRef$current2, _scrollContainer$curr;
        var _ref = (_affixWrapRef$current = (_affixWrapRef$current2 = affixWrapRef.current) === null || _affixWrapRef$current2 === void 0 ? void 0 : _affixWrapRef$current2.getBoundingClientRect()) !== null && _affixWrapRef$current !== void 0 ? _affixWrapRef$current : {
            top: 0
          },
          _ref$top = _ref.top,
          wrapToTop = _ref$top === void 0 ? 0 : _ref$top,
          _ref$width = _ref.width,
          wrapWidth = _ref$width === void 0 ? 0 : _ref$width,
          _ref$height = _ref.height,
          wrapHeight = _ref$height === void 0 ? 0 : _ref$height;
        var containerToTop = 0;
        if (scrollContainer.current instanceof HTMLElement) {
          containerToTop = scrollContainer.current.getBoundingClientRect().top;
        }
        var calcTop = wrapToTop - containerToTop;
        var containerHeight = ((_scrollContainer$curr = scrollContainer.current) === null || _scrollContainer$curr === void 0 ? void 0 : _scrollContainer$curr[scrollContainer.current instanceof Window ? "innerHeight" : "clientHeight"]) - wrapHeight;
        var calcBottom = containerToTop + containerHeight - (offsetBottom !== null && offsetBottom !== void 0 ? offsetBottom : 0);
        var fixedTop;
        if (calcTop <= offsetTop) {
          fixedTop = containerToTop + offsetTop;
        } else if (wrapToTop >= calcBottom) {
          fixedTop = calcBottom;
        } else {
          fixedTop = false;
        }
        if (affixRef.current) {
          var affixed = fixedTop !== false;
          var placeholderStatus = affixWrapRef.current.contains(placeholderEL.current);
          var prePlaceholderStatus = placeholderStatus;
          if (affixed) {
            affixRef.current.className = "".concat(classPrefix, "-affix");
            affixRef.current.style.top = "".concat(fixedTop, "px");
            affixRef.current.style.width = "".concat(wrapWidth, "px");
            affixRef.current.style.height = "".concat(wrapHeight, "px");
            if (zIndex) {
              affixRef.current.style.zIndex = "".concat(zIndex);
            }
            if (!placeholderStatus) {
              placeholderEL.current.style.width = "".concat(wrapWidth, "px");
              placeholderEL.current.style.height = "".concat(wrapHeight, "px");
              affixWrapRef.current.appendChild(placeholderEL.current);
              placeholderStatus = true;
            }
          } else {
            affixRef.current.removeAttribute("class");
            affixRef.current.removeAttribute("style");
            if (placeholderStatus) {
              placeholderEL.current.remove();
              placeholderStatus = false;
            }
          }
          if (prePlaceholderStatus !== placeholderStatus && isFunction(onFixedChange)) {
            onFixedChange(affixed, {
              top: +fixedTop
            });
          }
        }
        ticking.current = false;
      });
    }
    ticking.current = true;
  }, [classPrefix, offsetBottom, offsetTop, onFixedChange, zIndex]);
  useImperativeHandle(ref, function () {
    return {
      handleScroll: handleScroll
    };
  });
  useEffect(function () {
    placeholderEL.current = document.createElement("div");
  }, []);
  useEffect(function () {
    scrollContainer.current = getScrollContainer(container);
    if (scrollContainer.current) {
      handleScroll();
      scrollContainer.current.addEventListener("scroll", handleScroll);
      window.addEventListener("resize", handleScroll);
      return function () {
        scrollContainer.current.removeEventListener("scroll", handleScroll);
        window.removeEventListener("resize", handleScroll);
      };
    }
  }, [container, handleScroll]);
  return /* @__PURE__ */React.createElement("div", {
    ref: affixWrapRef,
    className: className,
    style: style
  }, /* @__PURE__ */React.createElement("div", {
    ref: affixRef
  }, children || content));
});
Affix.displayName = "Affix";

export { Affix as default };
//# sourceMappingURL=Affix.js.map