text: 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 ownKeys(object, enumerableOnly) { var keys = Object.keys(object); if (Object.getOwnPropertySymbols) { var symbols = Object.getOwnPropertySymbols(object); if (enumerableOnly) symbols = symbols.filter(function (sym) { return Object.getOwnPropertyDescriptor(object, sym).enumerable; }); keys.push.apply(keys, symbols); } return keys; }
  
  function _objectSpread(target) { for (var i = 1; i < arguments.length; i++) { var source = arguments[i] != null ? arguments[i] : {}; if (i % 2) { ownKeys(source, true).forEach(function (key) { _defineProperty(target, key, source[key]); }); } else if (Object.getOwnPropertyDescriptors) { Object.defineProperties(target, Object.getOwnPropertyDescriptors(source)); } else { ownKeys(source).forEach(function (key) { Object.defineProperty(target, key, Object.getOwnPropertyDescriptor(source, key)); }); } } return target; }
  
  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 _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); }
  
  import * as React from 'react';
  import findDOMNode from "rc-util/es/Dom/findDOMNode";
  import toArray from "rc-util/es/Children/toArray";
  import warning from "rc-util/es/warning";
  import { composeRef, supportRef } from "rc-util/es/ref";
  import ResizeObserver from 'resize-observer-polyfill';
  var INTERNAL_PREFIX_KEY = 'rc-observer-key'; // Still need to be compatible with React 15, we use class component here
  
  var ReactResizeObserver =
  /*#__PURE__*/
  function (_React$Component) {
    _inherits(ReactResizeObserver, _React$Component);
  
    function ReactResizeObserver() {
      var _this;
  
      _classCallCheck(this, ReactResizeObserver);
  
      _this = _possibleConstructorReturn(this, _getPrototypeOf(ReactResizeObserver).apply(this, arguments));
      _this.resizeObserver = null;
      _this.childNode = null;
      _this.currentElement = null;
      _this.state = {
        width: 0,
        height: 0
      };
  
      _this.onResize = function (entries) {
        var onResize = _this.props.onResize;
        var target = entries[0].target;
  
        var _target$getBoundingCl = target.getBoundingClientRect(),
            width = _target$getBoundingCl.width,
            height = _target$getBoundingCl.height;
  
        var offsetWidth = target.offsetWidth,
            offsetHeight = target.offsetHeight;
        /**
         * Resize observer trigger when content size changed.
         * In most case we just care about element size,
         * let's use `boundary` instead of `contentRect` here to avoid shaking.
         */
  
        var fixedWidth = Math.floor(width);
        var fixedHeight = Math.floor(height);
  
        if (_this.state.width !== fixedWidth || _this.state.height !== fixedHeight) {
          var size = {
            width: fixedWidth,
            height: fixedHeight
          };
  
          _this.setState(size);
  
          if (onResize) {
            onResize(_objectSpread({}, size, {
              offsetWidth: offsetWidth,
              offsetHeight: offsetHeight
            }));
          }
        }
      };
  
      _this.setChildNode = function (node) {
        _this.childNode = node;
      };
  
      return _this;
    }
  
    _createClass(ReactResizeObserver, [{
      key: "componentDidMount",
      value: function componentDidMount() {
        this.onComponentUpdated();
      }
    }, {
      key: "componentDidUpdate",
      value: function componentDidUpdate() {
        this.onComponentUpdated();
      }
    }, {
      key: "componentWillUnmount",
      value: function componentWillUnmount() {
        this.destroyObserver();
      }
    }, {
      key: "onComponentUpdated",
      value: function onComponentUpdated() {
        var disabled = this.props.disabled; // Unregister if disabled
  
        if (disabled) {
          this.destroyObserver();
          return;
        } // Unregister if element changed
  
  
        var element = findDOMNode(this.childNode || this);
        var elementChanged = element !== this.currentElement;
  
        if (elementChanged) {
          this.destroyObserver();
          this.currentElement = element;
        }
  
        if (!this.resizeObserver && element) {
          this.resizeObserver = new ResizeObserver(this.onResize);
          this.resizeObserver.observe(element);
        }
      }
    }, {
      key: "destroyObserver",
      value: function destroyObserver() {
        if (this.resizeObserver) {
          this.resizeObserver.disconnect();
          this.resizeObserver = null;
        }
      }
    }, {
      key: "render",
      value: function render() {
        var children = this.props.children;
        var childNodes = toArray(children);
  
        if (childNodes.length > 1) {
          warning(false, 'Find more than one child node with `children` in ResizeObserver. Will only observe first one.');
        } else if (childNodes.length === 0) {
          warning(false, '`children` of ResizeObserver is empty. Nothing is in observe.');
          return null;
        }
  
        var childNode = childNodes[0];
  
        if (React.isValidElement(childNode) && supportRef(childNode)) {
          var ref = childNode.ref;
          childNodes[0] = React.cloneElement(childNode, {
            ref: composeRef(ref, this.setChildNode)
          });
        }
  
        return childNodes.length === 1 ? childNodes[0] : childNodes.map(function (node, index) {
          if (!React.isValidElement(node) || 'key' in node && node.key !== null) {
            return node;
          }
  
          return React.cloneElement(node, {
            key: "".concat(INTERNAL_PREFIX_KEY, "-").concat(index)
          });
        });
      }
    }]);
  
    return ReactResizeObserver;
  }(React.Component);
  
  ReactResizeObserver.displayName = 'ResizeObserver';
  export default ReactResizeObserver;