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frontend/node_modules/antd/es/float-button/BackTop.js

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+"use client";
+
+var __rest = this && this.__rest || function (s, e) {
+  var t = {};
+  for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p) && e.indexOf(p) < 0) t[p] = s[p];
+  if (s != null && typeof Object.getOwnPropertySymbols === "function") for (var i = 0, p = Object.getOwnPropertySymbols(s); i < p.length; i++) {
+    if (e.indexOf(p[i]) < 0 && Object.prototype.propertyIsEnumerable.call(s, p[i])) t[p[i]] = s[p[i]];
+  }
+  return t;
+};
+import React, { useContext, useEffect, useState } from 'react';
+import VerticalAlignTopOutlined from "@ant-design/icons/es/icons/VerticalAlignTopOutlined";
+import classNames from 'classnames';
+import CSSMotion from 'rc-motion';
+import { composeRef } from "rc-util/es/ref";
+import getScroll from '../_util/getScroll';
+import scrollTo from '../_util/scrollTo';
+import throttleByAnimationFrame from '../_util/throttleByAnimationFrame';
+import { ConfigContext } from '../config-provider';
+import { useComponentConfig } from '../config-provider/context';
+import FloatButtonGroupContext from './context';
+import FloatButton, { floatButtonPrefixCls } from './FloatButton';
+const defaultIcon = /*#__PURE__*/React.createElement(VerticalAlignTopOutlined, null);
+const BackTop = /*#__PURE__*/React.forwardRef((props, ref) => {
+  var _a;
+  const {
+    backTopIcon: contextIcon
+  } = useComponentConfig('floatButton');
+  const {
+      prefixCls: customizePrefixCls,
+      className,
+      type = 'default',
+      shape = 'circle',
+      visibilityHeight = 400,
+      icon,
+      target,
+      onClick,
+      duration = 450
+    } = props,
+    restProps = __rest(props, ["prefixCls", "className", "type", "shape", "visibilityHeight", "icon", "target", "onClick", "duration"]);
+  const mergedIcon = (_a = icon !== null && icon !== void 0 ? icon : contextIcon) !== null && _a !== void 0 ? _a : defaultIcon;
+  const [visible, setVisible] = useState(visibilityHeight === 0);
+  const internalRef = React.useRef(null);
+  React.useImperativeHandle(ref, () => ({
+    nativeElement: internalRef.current
+  }));
+  const getDefaultTarget = () => {
+    var _a;
+    return ((_a = internalRef.current) === null || _a === void 0 ? void 0 : _a.ownerDocument) || window;
+  };
+  const handleScroll = throttleByAnimationFrame(e => {
+    const scrollTop = getScroll(e.target);
+    setVisible(scrollTop >= visibilityHeight);
+  });
+  useEffect(() => {
+    const getTarget = target || getDefaultTarget;
+    const container = getTarget();
+    handleScroll({
+      target: container
+    });
+    container === null || container === void 0 ? void 0 : container.addEventListener('scroll', handleScroll);
+    return () => {
+      handleScroll.cancel();
+      container === null || container === void 0 ? void 0 : container.removeEventListener('scroll', handleScroll);
+    };
+  }, [target]);
+  const scrollToTop = e => {
+    scrollTo(0, {
+      getContainer: target || getDefaultTarget,
+      duration
+    });
+    onClick === null || onClick === void 0 ? void 0 : onClick(e);
+  };
+  const {
+    getPrefixCls
+  } = useContext(ConfigContext);
+  const prefixCls = getPrefixCls(floatButtonPrefixCls, customizePrefixCls);
+  const rootPrefixCls = getPrefixCls();
+  const groupShape = useContext(FloatButtonGroupContext);
+  const mergedShape = groupShape || shape;
+  const contentProps = Object.assign({
+    prefixCls,
+    icon: mergedIcon,
+    type,
+    shape: mergedShape
+  }, restProps);
+  return /*#__PURE__*/React.createElement(CSSMotion, {
+    visible: visible,
+    motionName: `${rootPrefixCls}-fade`
+  }, ({
+    className: motionClassName
+  }, setRef) => (/*#__PURE__*/React.createElement(FloatButton, Object.assign({
+    ref: composeRef(internalRef, setRef)
+  }, contentProps, {
+    onClick: scrollToTop,
+    className: classNames(className, motionClassName)
+  }))));
+});
+if (process.env.NODE_ENV !== 'production') {
+  BackTop.displayName = 'BackTop';
+}
+export default BackTop;