"use strict";

function _typeof(obj) { "@babel/helpers - typeof"; return _typeof = "function" == typeof Symbol && "symbol" == typeof Symbol.iterator ? function (obj) { return typeof obj; } : function (obj) { return obj && "function" == typeof Symbol && obj.constructor === Symbol && obj !== Symbol.prototype ? "symbol" : typeof obj; }, _typeof(obj); }

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

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

var _classnames = _interopRequireDefault(require("classnames"));

var _scrollbar = _interopRequireDefault(require("../../scrollbar"));

require("./index.css");

var _excluded = ["children", "maskHeight", "style"];

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

function _getRequireWildcardCache(nodeInterop) { if (typeof WeakMap !== "function") return null; var cacheBabelInterop = new WeakMap(); var cacheNodeInterop = new WeakMap(); return (_getRequireWildcardCache = function _getRequireWildcardCache(nodeInterop) { return nodeInterop ? cacheNodeInterop : cacheBabelInterop; })(nodeInterop); }

function _interopRequireWildcard(obj, nodeInterop) { if (!nodeInterop && obj && obj.__esModule) { return obj; } if (obj === null || _typeof(obj) !== "object" && typeof obj !== "function") { return { "default": obj }; } var cache = _getRequireWildcardCache(nodeInterop); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (key !== "default" && Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj["default"] = obj; if (cache) { cache.set(obj, newObj); } return newObj; }

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 _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 _slicedToArray(arr, i) { return _arrayWithHoles(arr) || _iterableToArrayLimit(arr, i) || _unsupportedIterableToArray(arr, i) || _nonIterableRest(); }

function _nonIterableRest() { throw new TypeError("Invalid attempt to destructure non-iterable instance.\nIn order to be iterable, non-array objects must have a [Symbol.iterator]() method."); }

function _unsupportedIterableToArray(o, minLen) { if (!o) return; if (typeof o === "string") return _arrayLikeToArray(o, minLen); var n = Object.prototype.toString.call(o).slice(8, -1); if (n === "Object" && o.constructor) n = o.constructor.name; if (n === "Map" || n === "Set") return Array.from(o); if (n === "Arguments" || /^(?:Ui|I)nt(?:8|16|32)(?:Clamped)?Array$/.test(n)) return _arrayLikeToArray(o, minLen); }

function _arrayLikeToArray(arr, len) { if (len == null || len > arr.length) len = arr.length; for (var i = 0, arr2 = new Array(len); i < len; i++) { arr2[i] = arr[i]; } return arr2; }

function _iterableToArrayLimit(arr, i) { var _i = arr == null ? null : typeof Symbol !== "undefined" && arr[Symbol.iterator] || arr["@@iterator"]; if (_i == null) return; var _arr = []; var _n = true; var _d = false; var _s, _e; try { for (_i = _i.call(arr); !(_n = (_s = _i.next()).done); _n = true) { _arr.push(_s.value); if (i && _arr.length === i) break; } } catch (err) { _d = true; _e = err; } finally { try { if (!_n && _i["return"] != null) _i["return"](); } finally { if (_d) throw _e; } } return _arr; }

function _arrayWithHoles(arr) { if (Array.isArray(arr)) return arr; }

function _objectWithoutProperties(source, excluded) { if (source == null) return {}; var target = _objectWithoutPropertiesLoose(source, excluded); var key, i; if (Object.getOwnPropertySymbols) { var sourceSymbolKeys = Object.getOwnPropertySymbols(source); for (i = 0; i < sourceSymbolKeys.length; i++) { key = sourceSymbolKeys[i]; if (excluded.indexOf(key) >= 0) continue; if (!Object.prototype.propertyIsEnumerable.call(source, key)) continue; target[key] = source[key]; } } return target; }

function _objectWithoutPropertiesLoose(source, excluded) { if (source == null) return {}; var target = {}; var sourceKeys = Object.keys(source); var key, i; for (i = 0; i < sourceKeys.length; i++) { key = sourceKeys[i]; if (excluded.indexOf(key) >= 0) continue; target[key] = source[key]; } return target; }

var preCls = "titaui-scroll-mask";

var ScrollBarMask = function ScrollBarMask(_ref) {
  var _scrollRef$current, _scrollRef$current2;

  var children = _ref.children,
      maskHeight = _ref.maskHeight,
      _ref$style = _ref.style,
      style = _ref$style === void 0 ? {
    height: "100%"
  } : _ref$style,
      restProps = _objectWithoutProperties(_ref, _excluded);

  var _useState = (0, _react.useState)(true),
      _useState2 = _slicedToArray(_useState, 2),
      isScrollToTop = _useState2[0],
      setIsScrollToTop = _useState2[1];

  var _useState3 = (0, _react.useState)(false),
      _useState4 = _slicedToArray(_useState3, 2),
      isScrollToBottom = _useState4[0],
      setIsScrollToBottom = _useState4[1];

  var _useState5 = (0, _react.useState)(false),
      _useState6 = _slicedToArray(_useState5, 2),
      isOverFlow = _useState6[0],
      setIsOverFlow = _useState6[1];

  var scrollRef = (0, _react.useRef)(); // @ts-ignore

  var scrollElement = (_scrollRef$current = scrollRef.current) === null || _scrollRef$current === void 0 ? void 0 : _scrollRef$current.scrollElement; // @ts-ignore

  var contentElement = (_scrollRef$current2 = scrollRef.current) === null || _scrollRef$current2 === void 0 ? void 0 : _scrollRef$current2.contentElement;

  var handleScroll = function handleScroll() {
    // 判断是否滚动到顶部
    if (!(scrollElement !== null && scrollElement !== void 0 && scrollElement.scrollTop)) {
      setIsScrollToTop(true);
    } else {
      setIsScrollToTop(false);
    } // 判断是否滚动到底部


    if (scrollElement && scrollElement.scrollTop + scrollElement.offsetHeight === scrollElement.scrollHeight) {
      setIsScrollToBottom(true);
    } else {
      setIsScrollToBottom(false);
    }
  };

  (0, _react.useEffect)(function () {
    // 判断是否出现滚动条
    if ((scrollElement === null || scrollElement === void 0 ? void 0 : scrollElement.offsetHeight) < (scrollElement === null || scrollElement === void 0 ? void 0 : scrollElement.scrollHeight)) {
      setIsOverFlow(true);
    }
  }, [scrollElement === null || scrollElement === void 0 ? void 0 : scrollElement.scrollHeight]);
  (0, _react.useEffect)(function () {
    var mutation;

    if (contentElement) {
      var config = {
        characterData: true,
        // 监听元素内的数据变动
        childList: true,
        // 监听子元素数量变动（子元素的属性变化不会触发事件）（只针对一级子元素，孙子元素的数量变化不会触发事件）
        subtree: true // 将observer事件下发到目标元素的所有子元素，相当于对子元素也进行了observer

      };

      var recalculate = function recalculate() {
        if (contentElement.scrollHeight > scrollElement.offsetHeight) {
          setIsOverFlow(true);
        } else {
          setIsOverFlow(false);
        }
      };

      mutation = new MutationObserver(recalculate);
      mutation.observe(contentElement, config);
    }
  }, [contentElement]);
  return /*#__PURE__*/_react["default"].createElement("div", {
    className: preCls,
    onScroll: handleScroll
  }, /*#__PURE__*/_react["default"].createElement(_scrollbar["default"], _extends({
    ref: scrollRef,
    style: style
  }, restProps), children), isOverFlow && /*#__PURE__*/_react["default"].createElement("div", {
    className: (0, _classnames["default"])(_defineProperty({}, "".concat(preCls, "__top--hide"), isScrollToTop), _defineProperty({}, "".concat(preCls, "__top"), !isScrollToTop)),
    style: {
      height: "".concat(maskHeight, "px")
    }
  }), isOverFlow && /*#__PURE__*/_react["default"].createElement("div", {
    className: (0, _classnames["default"])(_defineProperty({}, "".concat(preCls, "__bottom--hide"), isScrollToBottom), _defineProperty({}, "".concat(preCls, "__bottom"), !isScrollToBottom)),
    style: {
      height: "".concat(maskHeight, "px")
    }
  }));
};

ScrollBarMask.defaultProps = {
  style: {
    height: "100%"
  }
};
var _default = ScrollBarMask;
exports["default"] = _default;