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Viewing file:     WindowScroller.js (11.47 KB)      -rw-r--r--

"use strict";

var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");

var _interopRequireWildcard = require("@babel/runtime/helpers/interopRequireWildcard");

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports["default"] = exports.IS_SCROLLING_TIMEOUT = void 0;

var _classCallCheck2 = _interopRequireDefault(require("@babel/runtime/helpers/classCallCheck"));

var _createClass2 = _interopRequireDefault(require("@babel/runtime/helpers/createClass"));

var _possibleConstructorReturn2 = _interopRequireDefault(require("@babel/runtime/helpers/possibleConstructorReturn"));

var _getPrototypeOf3 = _interopRequireDefault(require("@babel/runtime/helpers/getPrototypeOf"));

var _assertThisInitialized2 = _interopRequireDefault(require("@babel/runtime/helpers/assertThisInitialized"));

var _inherits2 = _interopRequireDefault(require("@babel/runtime/helpers/inherits"));

var _defineProperty2 = _interopRequireDefault(require("@babel/runtime/helpers/defineProperty"));

var React = _interopRequireWildcard(require("react"));

var ReactDOM = _interopRequireWildcard(require("react-dom"));

var _onScroll = require("./utils/onScroll");

var _dimensions = require("./utils/dimensions");

var _detectElementResize = _interopRequireDefault(require("../vendor/detectElementResize"));

var _propTypes = _interopRequireDefault(require("prop-types"));

var _class, _temp;

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) { (0, _defineProperty2["default"])(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; }

/**
 * Specifies the number of miliseconds during which to disable pointer events while a scroll is in progress.
 * This improves performance and makes scrolling smoother.
 */
var IS_SCROLLING_TIMEOUT = 150;
exports.IS_SCROLLING_TIMEOUT = IS_SCROLLING_TIMEOUT;

var getWindow = function getWindow() {
  return typeof window !== 'undefined' ? window : undefined;
};

var WindowScroller = (_temp = _class =
/*#__PURE__*/
function (_React$PureComponent) {
  (0, _inherits2["default"])(WindowScroller, _React$PureComponent);

  function WindowScroller() {
    var _getPrototypeOf2;

    var _this;

    (0, _classCallCheck2["default"])(this, WindowScroller);

    for (var _len = arguments.length, args = new Array(_len), _key = 0; _key < _len; _key++) {
      args[_key] = arguments[_key];
    }

    _this = (0, _possibleConstructorReturn2["default"])(this, (_getPrototypeOf2 = (0, _getPrototypeOf3["default"])(WindowScroller)).call.apply(_getPrototypeOf2, [this].concat(args)));
    (0, _defineProperty2["default"])((0, _assertThisInitialized2["default"])(_this), "_window", getWindow());
    (0, _defineProperty2["default"])((0, _assertThisInitialized2["default"])(_this), "_isMounted", false);
    (0, _defineProperty2["default"])((0, _assertThisInitialized2["default"])(_this), "_positionFromTop", 0);
    (0, _defineProperty2["default"])((0, _assertThisInitialized2["default"])(_this), "_positionFromLeft", 0);
    (0, _defineProperty2["default"])((0, _assertThisInitialized2["default"])(_this), "_detectElementResize", void 0);
    (0, _defineProperty2["default"])((0, _assertThisInitialized2["default"])(_this), "_child", void 0);
    (0, _defineProperty2["default"])((0, _assertThisInitialized2["default"])(_this), "state", _objectSpread({}, (0, _dimensions.getDimensions)(_this.props.scrollElement, _this.props), {
      isScrolling: false,
      scrollLeft: 0,
      scrollTop: 0
    }));
    (0, _defineProperty2["default"])((0, _assertThisInitialized2["default"])(_this), "_registerChild", function (element) {
      if (element && !(element instanceof Element)) {
        console.warn('WindowScroller registerChild expects to be passed Element or null');
      }

      _this._child = element;

      _this.updatePosition();
    });
    (0, _defineProperty2["default"])((0, _assertThisInitialized2["default"])(_this), "_onChildScroll", function (_ref) {
      var scrollTop = _ref.scrollTop;

      if (_this.state.scrollTop === scrollTop) {
        return;
      }

      var scrollElement = _this.props.scrollElement;

      if (scrollElement) {
        if (typeof scrollElement.scrollTo === 'function') {
          scrollElement.scrollTo(0, scrollTop + _this._positionFromTop);
        } else {
          scrollElement.scrollTop = scrollTop + _this._positionFromTop;
        }
      }
    });
    (0, _defineProperty2["default"])((0, _assertThisInitialized2["default"])(_this), "_registerResizeListener", function (element) {
      if (element === window) {
        window.addEventListener('resize', _this._onResize, false);
      } else {
        _this._detectElementResize.addResizeListener(element, _this._onResize);
      }
    });
    (0, _defineProperty2["default"])((0, _assertThisInitialized2["default"])(_this), "_unregisterResizeListener", function (element) {
      if (element === window) {
        window.removeEventListener('resize', _this._onResize, false);
      } else if (element) {
        _this._detectElementResize.removeResizeListener(element, _this._onResize);
      }
    });
    (0, _defineProperty2["default"])((0, _assertThisInitialized2["default"])(_this), "_onResize", function () {
      _this.updatePosition();
    });
    (0, _defineProperty2["default"])((0, _assertThisInitialized2["default"])(_this), "__handleWindowScrollEvent", function () {
      if (!_this._isMounted) {
        return;
      }

      var onScroll = _this.props.onScroll;
      var scrollElement = _this.props.scrollElement;

      if (scrollElement) {
        var scrollOffset = (0, _dimensions.getScrollOffset)(scrollElement);
        var scrollLeft = Math.max(0, scrollOffset.left - _this._positionFromLeft);
        var scrollTop = Math.max(0, scrollOffset.top - _this._positionFromTop);

        _this.setState({
          isScrolling: true,
          scrollLeft: scrollLeft,
          scrollTop: scrollTop
        });

        onScroll({
          scrollLeft: scrollLeft,
          scrollTop: scrollTop
        });
      }
    });
    (0, _defineProperty2["default"])((0, _assertThisInitialized2["default"])(_this), "__resetIsScrolling", function () {
      _this.setState({
        isScrolling: false
      });
    });
    return _this;
  }

  (0, _createClass2["default"])(WindowScroller, [{
    key: "updatePosition",
    value: function updatePosition() {
      var scrollElement = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : this.props.scrollElement;
      var onResize = this.props.onResize;
      var _this$state = this.state,
          height = _this$state.height,
          width = _this$state.width;
      var thisNode = this._child || ReactDOM.findDOMNode(this);

      if (thisNode instanceof Element && scrollElement) {
        var offset = (0, _dimensions.getPositionOffset)(thisNode, scrollElement);
        this._positionFromTop = offset.top;
        this._positionFromLeft = offset.left;
      }

      var dimensions = (0, _dimensions.getDimensions)(scrollElement, this.props);

      if (height !== dimensions.height || width !== dimensions.width) {
        this.setState({
          height: dimensions.height,
          width: dimensions.width
        });
        onResize({
          height: dimensions.height,
          width: dimensions.width
        });
      }
    }
  }, {
    key: "componentDidMount",
    value: function componentDidMount() {
      var scrollElement = this.props.scrollElement;
      this._detectElementResize = (0, _detectElementResize["default"])();
      this.updatePosition(scrollElement);

      if (scrollElement) {
        (0, _onScroll.registerScrollListener)(this, scrollElement);

        this._registerResizeListener(scrollElement);
      }

      this._isMounted = true;
    }
  }, {
    key: "componentDidUpdate",
    value: function componentDidUpdate(prevProps, prevState) {
      var scrollElement = this.props.scrollElement;
      var prevScrollElement = prevProps.scrollElement;

      if (prevScrollElement !== scrollElement && prevScrollElement != null && scrollElement != null) {
        this.updatePosition(scrollElement);
        (0, _onScroll.unregisterScrollListener)(this, prevScrollElement);
        (0, _onScroll.registerScrollListener)(this, scrollElement);

        this._unregisterResizeListener(prevScrollElement);

        this._registerResizeListener(scrollElement);
      }
    }
  }, {
    key: "componentWillUnmount",
    value: function componentWillUnmount() {
      var scrollElement = this.props.scrollElement;

      if (scrollElement) {
        (0, _onScroll.unregisterScrollListener)(this, scrollElement);

        this._unregisterResizeListener(scrollElement);
      }

      this._isMounted = false;
    }
  }, {
    key: "render",
    value: function render() {
      var children = this.props.children;
      var _this$state2 = this.state,
          isScrolling = _this$state2.isScrolling,
          scrollTop = _this$state2.scrollTop,
          scrollLeft = _this$state2.scrollLeft,
          height = _this$state2.height,
          width = _this$state2.width;
      return children({
        onChildScroll: this._onChildScroll,
        registerChild: this._registerChild,
        height: height,
        isScrolling: isScrolling,
        scrollLeft: scrollLeft,
        scrollTop: scrollTop,
        width: width
      });
    }
  }]);
  return WindowScroller;
}(React.PureComponent), (0, _defineProperty2["default"])(_class, "propTypes", process.env.NODE_ENV === 'production' ? null : {
  /**
   * Function responsible for rendering children.
   * This function should implement the following signature:
   * ({ height, isScrolling, scrollLeft, scrollTop, width }) => PropTypes.element
   */
  "children": _propTypes["default"].func.isRequired,

  /** Callback to be invoked on-resize: ({ height, width }) */
  "onResize": _propTypes["default"].func.isRequired,

  /** Callback to be invoked on-scroll: ({ scrollLeft, scrollTop }) */
  "onScroll": _propTypes["default"].func.isRequired,

  /** Element to attach scroll event listeners. Defaults to window. */
  "scrollElement": _propTypes["default"].oneOfType([_propTypes["default"].any, function () {
    return (typeof Element === "function" ? _propTypes["default"].instanceOf(Element) : _propTypes["default"].any).apply(this, arguments);
  }]),

  /**
   * Wait this amount of time after the last scroll event before resetting child `pointer-events`.
   */
  "scrollingResetTimeInterval": _propTypes["default"].number.isRequired,

  /** Height used for server-side rendering */
  "serverHeight": _propTypes["default"].number.isRequired,

  /** Width used for server-side rendering */
  "serverWidth": _propTypes["default"].number.isRequired
}), _temp);
exports["default"] = WindowScroller;
(0, _defineProperty2["default"])(WindowScroller, "defaultProps", {
  onResize: function onResize() {},
  onScroll: function onScroll() {},
  scrollingResetTimeInterval: IS_SCROLLING_TIMEOUT,
  scrollElement: getWindow(),
  serverHeight: 0,
  serverWidth: 0
});