text: "use strict";
  
  Object.defineProperty(exports, "__esModule", {
    value: true
  });
  exports["default"] = void 0;
  
  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 _raf = _interopRequireDefault(require("raf"));
  
  var _configProvider = require("../config-provider");
  
  var _getScroll = _interopRequireDefault(require("../_util/getScroll"));
  
  function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }
  
  function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = Object.defineProperty && Object.getOwnPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : {}; if (desc.get || desc.set) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } } newObj["default"] = obj; return newObj; } }
  
  function _typeof(obj) { if (typeof Symbol === "function" && typeof Symbol.iterator === "symbol") { _typeof = function _typeof(obj) { return typeof obj; }; } else { _typeof = function _typeof(obj) { return obj && typeof Symbol === "function" && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }; } return _typeof(obj); }
  
  function _extends() { _extends = Object.assign || function (target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i]; for (var key in source) { if (Object.prototype.hasOwnProperty.call(source, key)) { target[key] = source[key]; } } } return target; }; return _extends.apply(this, arguments); }
  
  function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
  
  function _defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } }
  
  function _createClass(Constructor, protoProps, staticProps) { if (protoProps) _defineProperties(Constructor.prototype, protoProps); if (staticProps) _defineProperties(Constructor, staticProps); return Constructor; }
  
  function _possibleConstructorReturn(self, call) { if (call && (_typeof(call) === "object" || typeof call === "function")) { return call; } return _assertThisInitialized(self); }
  
  function _assertThisInitialized(self) { if (self === void 0) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return self; }
  
  function _getPrototypeOf(o) { _getPrototypeOf = Object.setPrototypeOf ? Object.getPrototypeOf : function _getPrototypeOf(o) { return o.__proto__ || Object.getPrototypeOf(o); }; return _getPrototypeOf(o); }
  
  function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function"); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, writable: true, configurable: true } }); if (superClass) _setPrototypeOf(subClass, superClass); }
  
  function _setPrototypeOf(o, p) { _setPrototypeOf = Object.setPrototypeOf || function _setPrototypeOf(o, p) { o.__proto__ = p; return o; }; return _setPrototypeOf(o, p); }
  
  var easeInOutCubic = function easeInOutCubic(t, b, c, d) {
    var cc = c - b;
    t /= d / 2;
  
    if (t < 1) {
      return cc / 2 * t * t * t + b;
    } else {
      return cc / 2 * ((t -= 2) * t * t + 2) + b;
    }
  };
  
  function noop() {}
  
  function getDefaultTarget() {
    return window;
  }
  
  var BackTop =
  /*#__PURE__*/
  function (_React$Component) {
    _inherits(BackTop, _React$Component);
  
    function BackTop(props) {
      var _this;
  
      _classCallCheck(this, BackTop);
  
      _this = _possibleConstructorReturn(this, _getPrototypeOf(BackTop).call(this, props));
  
      _this.getCurrentScrollTop = function () {
        var getTarget = _this.props.target || getDefaultTarget;
        var targetNode = getTarget();
  
        if (targetNode === window) {
          return window.pageYOffset || document.body.scrollTop || document.documentElement.scrollTop;
        }
  
        return targetNode.scrollTop;
      };
  
      _this.scrollToTop = function (e) {
        var scrollTop = _this.getCurrentScrollTop();
  
        var startTime = Date.now();
  
        var frameFunc = function frameFunc() {
          var timestamp = Date.now();
          var time = timestamp - startTime;
  
          _this.setScrollTop(easeInOutCubic(time, scrollTop, 0, 450));
  
          if (time < 450) {
            (0, _raf["default"])(frameFunc);
          } else {
            _this.setScrollTop(0);
          }
        };
  
        (0, _raf["default"])(frameFunc);
        (_this.props.onClick || noop)(e);
      };
  
      _this.handleScroll = function () {
        var _this$props = _this.props,
            visibilityHeight = _this$props.visibilityHeight,
            _this$props$target = _this$props.target,
            target = _this$props$target === void 0 ? getDefaultTarget : _this$props$target;
        var scrollTop = (0, _getScroll["default"])(target(), true);
  
        _this.setState({
          visible: scrollTop > visibilityHeight
        });
      };
  
      _this.renderBackTop = function (_ref) {
        var getPrefixCls = _ref.getPrefixCls;
        var _this$props2 = _this.props,
            customizePrefixCls = _this$props2.prefixCls,
            _this$props2$classNam = _this$props2.className,
            className = _this$props2$classNam === void 0 ? '' : _this$props2$classNam,
            children = _this$props2.children;
        var prefixCls = getPrefixCls('back-top', customizePrefixCls);
        var classString = (0, _classnames["default"])(prefixCls, className);
        var defaultElement = React.createElement("div", {
          className: "".concat(prefixCls, "-content")
        }, React.createElement("div", {
          className: "".concat(prefixCls, "-icon")
        })); // fix https://fb.me/react-unknown-prop
  
        var divProps = (0, _omit["default"])(_this.props, ['prefixCls', 'className', 'children', 'visibilityHeight', 'target', 'visible']);
        var visible = 'visible' in _this.props ? _this.props.visible : _this.state.visible;
        var backTopBtn = visible ? React.createElement("div", _extends({}, divProps, {
          className: classString,
          onClick: _this.scrollToTop
        }), children || defaultElement) : null;
        return React.createElement(_rcAnimate["default"], {
          component: "",
          transitionName: "fade"
        }, backTopBtn);
      };
  
      _this.state = {
        visible: false
      };
      return _this;
    }
  
    _createClass(BackTop, [{
      key: "setScrollTop",
      value: function setScrollTop(value) {
        var getTarget = this.props.target || getDefaultTarget;
        var targetNode = getTarget();
  
        if (targetNode === window) {
          document.body.scrollTop = value;
          document.documentElement.scrollTop = value;
        } else {
          targetNode.scrollTop = value;
        }
      }
    }, {
      key: "componentDidMount",
      value: function componentDidMount() {
        var getTarget = this.props.target || getDefaultTarget;
        this.scrollEvent = (0, _addEventListener["default"])(getTarget(), 'scroll', this.handleScroll);
        this.handleScroll();
      }
    }, {
      key: "componentWillUnmount",
      value: function componentWillUnmount() {
        if (this.scrollEvent) {
          this.scrollEvent.remove();
        }
      }
    }, {
      key: "render",
      value: function render() {
        return React.createElement(_configProvider.ConfigConsumer, null, this.renderBackTop);
      }
    }]);
  
    return BackTop;
  }(React.Component);
  
  exports["default"] = BackTop;
  BackTop.defaultProps = {
    visibilityHeight: 400
  };
  module.exports = exports.default;