text: "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 = 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.throttleByAnimationFrame)(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, (0, _defineProperty2["default"])({}, "".concat(prefixCls, "-rtl"), direction === 'rtl'), className); // 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;