index.js
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import _extends from "@babel/runtime/helpers/extends";
import _defineProperty from "@babel/runtime/helpers/defineProperty";
import _slicedToArray from "@babel/runtime/helpers/slicedToArray";
import * as React from 'react';
import CSSMotion from 'rc-motion';
import addEventListener from "rc-util/es/Dom/addEventListener";
import useMergedState from "rc-util/es/hooks/useMergedState";
import classNames from 'classnames';
import omit from 'omit.js';
import VerticalAlignTopOutlined from '@ant-design/icons/VerticalAlignTopOutlined';
import { throttleByAnimationFrame } from '../_util/throttleByAnimationFrame';
import { ConfigContext } from '../config-provider';
import getScroll from '../_util/getScroll';
import scrollTo from '../_util/scrollTo';
import { cloneElement } from '../_util/reactNode';
var BackTop = function BackTop(props) {
var _useMergedState = useMergedState(false, {
value: props.visible
}),
_useMergedState2 = _slicedToArray(_useMergedState, 2),
visible = _useMergedState2[0],
setVisible = _useMergedState2[1];
var ref = /*#__PURE__*/React.createRef();
var scrollEvent = React.useRef();
var getDefaultTarget = function getDefaultTarget() {
return ref.current && ref.current.ownerDocument ? ref.current.ownerDocument : window;
};
var handleScroll = throttleByAnimationFrame(function (e) {
var visibilityHeight = props.visibilityHeight;
var scrollTop = getScroll(e.target, true);
setVisible(scrollTop > visibilityHeight);
});
var bindScrollEvent = function bindScrollEvent() {
var target = props.target;
var getTarget = target || getDefaultTarget;
var container = getTarget();
scrollEvent.current = addEventListener(container, 'scroll', function (e) {
handleScroll(e);
});
handleScroll({
target: container
});
};
React.useEffect(function () {
bindScrollEvent();
return function () {
if (scrollEvent.current) {
scrollEvent.current.remove();
}
handleScroll.cancel();
};
}, [props.target]);
var scrollToTop = function scrollToTop(e) {
var onClick = props.onClick,
target = props.target,
_props$duration = props.duration,
duration = _props$duration === void 0 ? 450 : _props$duration;
scrollTo(0, {
getContainer: target || getDefaultTarget,
duration: duration
});
if (typeof onClick === 'function') {
onClick(e);
}
};
var renderChildren = function renderChildren(_ref) {
var prefixCls = _ref.prefixCls;
var children = props.children;
var defaultElement = /*#__PURE__*/React.createElement("div", {
className: "".concat(prefixCls, "-content")
}, /*#__PURE__*/React.createElement("div", {
className: "".concat(prefixCls, "-icon")
}, /*#__PURE__*/React.createElement(VerticalAlignTopOutlined, null)));
return /*#__PURE__*/React.createElement(CSSMotion, {
visible: visible,
motionName: "fade",
removeOnLeave: true
}, function (_ref2) {
var motionClassName = _ref2.className;
var childNode = children || defaultElement;
return /*#__PURE__*/React.createElement("div", null, cloneElement(childNode, function (_ref3) {
var className = _ref3.className;
return {
className: classNames(motionClassName, className)
};
}));
});
};
var _React$useContext = React.useContext(ConfigContext),
getPrefixCls = _React$useContext.getPrefixCls,
direction = _React$useContext.direction;
var customizePrefixCls = props.prefixCls,
_props$className = props.className,
className = _props$className === void 0 ? '' : _props$className;
var prefixCls = getPrefixCls('back-top', customizePrefixCls);
var classString = classNames(prefixCls, _defineProperty({}, "".concat(prefixCls, "-rtl"), direction === 'rtl'), className); // fix https://fb.me/react-unknown-prop
var divProps = omit(props, ['prefixCls', 'className', 'children', 'visibilityHeight', 'target', 'visible']);
return /*#__PURE__*/React.createElement("div", _extends({}, divProps, {
className: classString,
onClick: scrollToTop,
ref: ref
}), renderChildren({
prefixCls: prefixCls
}));
};
BackTop.defaultProps = {
visibilityHeight: 400
};
export default /*#__PURE__*/React.memo(BackTop);