antd/lib/back-top/index.js

An enterprise-class UI design language and React-based implementation

'use strict';

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

var _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; };

var _class, _temp, _initialiseProps;

var _react = require('react');

var _react2 = _interopRequireDefault(_react);

var _rcAnimate = require('rc-animate');

var _rcAnimate2 = _interopRequireDefault(_rcAnimate);

var _icon = require('../icon');

var _icon2 = _interopRequireDefault(_icon);

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

var _addEventListener2 = _interopRequireDefault(_addEventListener);

var _classnames = require('classnames');

var _classnames2 = _interopRequireDefault(_classnames);

var _object = require('object.omit');

var _object2 = _interopRequireDefault(_object);

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }

function _defaults(obj, defaults) { var keys = Object.getOwnPropertyNames(defaults); for (var i = 0; i < keys.length; i++) { var key = keys[i]; var value = Object.getOwnPropertyDescriptor(defaults, key); if (value && value.configurable && obj[key] === undefined) { Object.defineProperty(obj, key, value); } } return obj; }

function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }

function _objectWithoutProperties(obj, keys) { var target = {}; for (var i in obj) { if (keys.indexOf(i) >= 0) continue; if (!Object.prototype.hasOwnProperty.call(obj, i)) continue; target[i] = obj[i]; } return target; }

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

function _possibleConstructorReturn(self, call) { if (!self) { throw new ReferenceError("this hasn't been initialised - super() hasn't been called"); } return call && (typeof call === "object" || typeof call === "function") ? call : self; }

function _inherits(subClass, superClass) { if (typeof superClass !== "function" && superClass !== null) { throw new TypeError("Super expression must either be null or a function, not " + typeof superClass); } subClass.prototype = Object.create(superClass && superClass.prototype, { constructor: { value: subClass, enumerable: false, writable: true, configurable: true } }); if (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : _defaults(subClass, superClass); }

function getScroll(target, top) {
  if (typeof window === 'undefined') {
    return 0;
  }

  var prop = top ? 'pageYOffset' : 'pageXOffset';
  var method = top ? 'scrollTop' : 'scrollLeft';
  var isWindow = target === window;

  var ret = isWindow ? target[prop] : target[method];
  // ie6,7,8 standard mode
  if (isWindow && typeof ret !== 'number') {
    ret = window.document.documentElement[method];
  }

  return ret;
}

var BackTop = (_temp = _class = function (_React$Component) {
  _inherits(BackTop, _React$Component);

  function BackTop(props) {
    _classCallCheck(this, BackTop);

    var _this = _possibleConstructorReturn(this, _React$Component.call(this, props));

    _initialiseProps.call(_this);

    var scrollTop = getScroll(props.target(), true);
    _this.state = {
      visible: scrollTop > props.visibilityHeight
    };
    return _this;
  }

  BackTop.prototype.setScrollTop = function setScrollTop(value) {
    var targetNode = this.props.target();
    if (targetNode === window) {
      document.body.scrollTop = value;
      document.documentElement.scrollTop = value;
    } else {
      targetNode.scrollTop = value;
    }
  };

  BackTop.prototype.componentDidMount = function componentDidMount() {
    this.scrollEvent = (0, _addEventListener2["default"])(this.props.target(), 'scroll', this.handleScroll);
  };

  BackTop.prototype.componentWillUnmount = function componentWillUnmount() {
    if (this.scrollEvent) {
      this.scrollEvent.remove();
    }
  };

  BackTop.prototype.render = function render() {
    var _classNames;

    var _props = this.props,
        prefixCls = _props.prefixCls,
        className = _props.className,
        children = _props.children,
        otherProps = _objectWithoutProperties(_props, ['prefixCls', 'className', 'children']);

    var classString = (0, _classnames2["default"])((_classNames = {}, _defineProperty(_classNames, prefixCls, true), _defineProperty(_classNames, className, !!className), _classNames));

    var defaultElement = _react2["default"].createElement(
      'div',
      { className: prefixCls + '-content' },
      _react2["default"].createElement(_icon2["default"], { className: prefixCls + '-icon', type: 'to-top' })
    );

    // fix https://fb.me/react-unknown-prop
    var divProps = (0, _object2["default"])(otherProps, ['visibilityHeight']);

    return _react2["default"].createElement(
      _rcAnimate2["default"],
      { component: '', transitionName: 'fade' },
      this.state.visible ? _react2["default"].createElement(
        'div',
        _extends({}, divProps, { className: classString, onClick: this.scrollToTop }),
        children || defaultElement
      ) : null
    );
  };

  return BackTop;
}(_react2["default"].Component), _class.propTypes = {
  visibilityHeight: _react2["default"].PropTypes.number,
  target: _react2["default"].PropTypes.func
}, _class.defaultProps = {
  onClick: function onClick() {},

  visibilityHeight: 400,
  target: function target() {
    return window;
  },

  prefixCls: 'ant-back-top'
}, _initialiseProps = function _initialiseProps() {
  var _this2 = this;

  this.scrollToTop = function (e) {
    if (e) e.preventDefault();
    _this2.setScrollTop(0);
    _this2.props.onClick(e);
  };

  this.handleScroll = function () {
    var _props2 = _this2.props,
        visibilityHeight = _props2.visibilityHeight,
        target = _props2.target;

    var scrollTop = getScroll(target(), true);
    _this2.setState({
      visible: scrollTop > visibilityHeight
    });
  };
}, _temp);
exports["default"] = BackTop;
module.exports = exports['default'];