@jdcfe/yep-react/es/to-top/index.js

一套移动端的React组件库

import _extends from "@babel/runtime/helpers/extends";
import _classCallCheck from "@babel/runtime/helpers/classCallCheck";
import _createClass from "@babel/runtime/helpers/createClass";
import _inherits from "@babel/runtime/helpers/inherits";
import _possibleConstructorReturn from "@babel/runtime/helpers/possibleConstructorReturn";
import _getPrototypeOf from "@babel/runtime/helpers/getPrototypeOf";

function _createSuper(Derived) { var hasNativeReflectConstruct = _isNativeReflectConstruct(); return function _createSuperInternal() { var Super = _getPrototypeOf(Derived), result; if (hasNativeReflectConstruct) { var NewTarget = _getPrototypeOf(this).constructor; result = Reflect.construct(Super, arguments, NewTarget); } else { result = Super.apply(this, arguments); } return _possibleConstructorReturn(this, result); }; }

function _isNativeReflectConstruct() { if (typeof Reflect === "undefined" || !Reflect.construct) return false; if (Reflect.construct.sham) return false; if (typeof Proxy === "function") return true; try { Boolean.prototype.valueOf.call(Reflect.construct(Boolean, [], function () {})); return true; } catch (e) { return false; } }

import * as React from 'react';
import classNames from 'classnames';
import omit from 'lodash/omit';
import { CSSTransition } from 'react-transition-group';
import raf from 'raf';
import noop from '../_utils/noop';
import ToTopOutlined from '@jdcfe/icons-react/ToTopOutlined';

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;
  }
};

var ToTop = /*#__PURE__*/function (_React$PureComponent) {
  _inherits(ToTop, _React$PureComponent);

  var _super = _createSuper(ToTop);

  function ToTop(props) {
    var _this;

    _classCallCheck(this, ToTop);

    _this = _super.call(this, props);

    _this.handleScroll = function () {
      var displayHeight = _this.props.displayHeight;

      _this.setState({
        visible: window.pageYOffset > displayHeight
      });
    };

    _this.scrollToTop = function (e) {
      var _document = document,
          documentElement = _document.documentElement;
      var scrollTop = window.pageYOffset || document.body.scrollTop || documentElement && documentElement.scrollTop || 0;
      var startTime = Date.now();

      var frameFunc = function frameFunc() {
        var timestamp = Date.now();
        var time = timestamp - startTime;
        ToTop.setScrollTop({
          value: easeInOutCubic(time, scrollTop, 0, 450)
        });

        if (time < 450) {
          raf(frameFunc);
        } else {
          ToTop.setScrollTop({
            value: 0
          });
        }
      };

      raf(frameFunc);
      (_this.props.onClick || noop)(e);
    };

    _this.state = {
      visible: false
    };
    return _this;
  }

  _createClass(ToTop, [{
    key: "componentDidMount",
    value: function componentDidMount() {
      window.addEventListener('scroll', this.handleScroll);
    }
  }, {
    key: "componentWillUnmount",
    value: function componentWillUnmount() {
      window.removeEventListener('scroll', this.handleScroll);
    }
  }, {
    key: "render",
    value: function render() {
      var _this$props = this.props,
          prefixCls = _this$props.prefixCls,
          _this$props$className = _this$props.className,
          className = _this$props$className === void 0 ? '' : _this$props$className,
          children = _this$props.children,
          style = _this$props.style;
      var cls = classNames(prefixCls, className);
      var defaultElement = /*#__PURE__*/React.createElement("div", {
        className: "".concat(prefixCls, "-content")
      }, /*#__PURE__*/React.createElement(ToTopOutlined, {
        className: "".concat(prefixCls, "-icon")
      }));
      var divProps = omit(this.props, ['prefixCls', 'className', 'children', 'displayHeight', 'visible']);
      var visible = 'visible' in this.props ? this.props.visible : this.state.visible;
      return /*#__PURE__*/React.createElement(CSSTransition, {
        in: visible,
        timeout: 300,
        classNames: 'fade',
        unmountOnExit: true
      }, /*#__PURE__*/React.createElement("div", _extends({}, divProps, {
        style: style,
        className: cls,
        onClick: this.scrollToTop
      }), children || defaultElement));
    }
  }], [{
    key: "setScrollTop",
    value: function setScrollTop(parameters) {
      var value = parameters.value;
      var _document2 = document,
          documentElement = _document2.documentElement;
      document.body.scrollTop = value;

      if (documentElement) {
        documentElement.scrollTop = value;
      }
    }
  }]);

  return ToTop;
}(React.PureComponent);

ToTop.defaultProps = {
  prefixCls: 'Yep-to-top',
  style: {},
  displayHeight: 0
};
export default ToTop;