antd/lib/back-top/index.js

An enterprise-class UI design language and React components implementation

"use strict";

var _interopRequireWildcard = require("@babel/runtime/helpers/interopRequireWildcard");

var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports["default"] = void 0;

var _extends2 = _interopRequireDefault(require("@babel/runtime/helpers/extends"));

var _defineProperty2 = _interopRequireDefault(require("@babel/runtime/helpers/defineProperty"));

var _slicedToArray2 = _interopRequireDefault(require("@babel/runtime/helpers/slicedToArray"));

var React = _interopRequireWildcard(require("react"));

var _rcAnimate = _interopRequireDefault(require("rc-animate"));

var _addEventListener = _interopRequireDefault(require("rc-util/lib/Dom/addEventListener"));

var _classnames = _interopRequireDefault(require("classnames"));

var _omit = _interopRequireDefault(require("omit.js"));

var _VerticalAlignTopOutlined = _interopRequireDefault(require("@ant-design/icons/VerticalAlignTopOutlined"));

var _throttleByAnimationFrame = _interopRequireDefault(require("../_util/throttleByAnimationFrame"));

var _configProvider = require("../config-provider");

var _getScroll = _interopRequireDefault(require("../_util/getScroll"));

var _scrollTo = _interopRequireDefault(require("../_util/scrollTo"));

var BackTop = function BackTop(props) {
  var _React$useState = React.useState(false),
      _React$useState2 = (0, _slicedToArray2["default"])(_React$useState, 2),
      visible = _React$useState2[0],
      setVisible = _React$useState2[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 = (0, _throttleByAnimationFrame["default"])(function (e) {
    var visibilityHeight = props.visibilityHeight;
    var scrollTop = (0, _getScroll["default"])(e.target, true);
    setVisible(scrollTop > visibilityHeight);
  });

  var bindScrollEvent = function bindScrollEvent() {
    var target = props.target;
    var getTarget = target || getDefaultTarget;
    var container = getTarget();
    scrollEvent.current = (0, _addEventListener["default"])(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 getVisible = function getVisible() {
    if ('visible' in props) {
      return props.visible;
    }

    return visible;
  };

  var scrollToTop = function scrollToTop(e) {
    var onClick = props.onClick,
        target = props.target,
        _props$duration = props.duration,
        duration = _props$duration === void 0 ? 450 : _props$duration;
    (0, _scrollTo["default"])(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["default"], null)));
    return /*#__PURE__*/React.createElement(_rcAnimate["default"], {
      component: "",
      transitionName: "fade"
    }, getVisible() ? /*#__PURE__*/React.createElement("div", null, children || defaultElement) : null);
  };

  var _React$useContext = React.useContext(_configProvider.ConfigContext),
      getPrefixCls = _React$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 = (0, _classnames["default"])(prefixCls, className, (0, _defineProperty2["default"])({}, "".concat(prefixCls, "-rtl"), direction === 'rtl')); // fix https://fb.me/react-unknown-prop

  var divProps = (0, _omit["default"])(props, ['prefixCls', 'className', 'children', 'visibilityHeight', 'target', 'visible']);
  return /*#__PURE__*/React.createElement("div", (0, _extends2["default"])({}, divProps, {
    className: classString,
    onClick: scrollToTop,
    ref: ref
  }), renderChildren({
    prefixCls: prefixCls
  }));
};

BackTop.defaultProps = {
  visibilityHeight: 400
};

var _default = /*#__PURE__*/React.memo(BackTop);

exports["default"] = _default;