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Viewing file:     InfiniteLoader.example.js (7.62 KB)      -rw-r--r--

"use strict";

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

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

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports["default"] = 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 _getPrototypeOf2 = _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 _propTypes = _interopRequireDefault(require("prop-types"));

var _ContentBox = require("../demo/ContentBox");

var _immutable = _interopRequireDefault(require("immutable"));

var _AutoSizer = _interopRequireDefault(require("../AutoSizer"));

var _InfiniteLoader = _interopRequireDefault(require("./InfiniteLoader"));

var _List = _interopRequireDefault(require("../List"));

var _InfiniteLoaderExample = _interopRequireDefault(require("./InfiniteLoader.example.css"));

var STATUS_LOADING = 1;
var STATUS_LOADED = 2;

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

  function InfiniteLoaderExample(props) {
    var _this;

    (0, _classCallCheck2["default"])(this, InfiniteLoaderExample);
    _this = (0, _possibleConstructorReturn2["default"])(this, (0, _getPrototypeOf2["default"])(InfiniteLoaderExample).call(this, props));
    _this.state = {
      loadedRowCount: 0,
      loadedRowsMap: {},
      loadingRowCount: 0
    };
    _this._timeoutIdMap = {};
    _this._clearData = _this._clearData.bind((0, _assertThisInitialized2["default"])(_this));
    _this._isRowLoaded = _this._isRowLoaded.bind((0, _assertThisInitialized2["default"])(_this));
    _this._loadMoreRows = _this._loadMoreRows.bind((0, _assertThisInitialized2["default"])(_this));
    _this._rowRenderer = _this._rowRenderer.bind((0, _assertThisInitialized2["default"])(_this));
    return _this;
  }

  (0, _createClass2["default"])(InfiniteLoaderExample, [{
    key: "componentWillUnmount",
    value: function componentWillUnmount() {
      Object.keys(this._timeoutIdMap).forEach(function (timeoutId) {
        clearTimeout(timeoutId);
      });
    }
  }, {
    key: "render",
    value: function render() {
      var _this2 = this;

      var list = this.context.list;
      var _this$state = this.state,
          loadedRowCount = _this$state.loadedRowCount,
          loadingRowCount = _this$state.loadingRowCount;
      return React.createElement(_ContentBox.ContentBox, null, React.createElement(_ContentBox.ContentBoxHeader, {
        text: "InfiniteLoader",
        sourceLink: "https://github.com/bvaughn/react-virtualized/blob/master/source/InfiniteLoader/InfiniteLoader.example.js",
        docsLink: "https://github.com/bvaughn/react-virtualized/blob/master/docs/InfiniteLoader.md"
      }), React.createElement(_ContentBox.ContentBoxParagraph, null, "This component manages just-in-time data fetching to ensure that the all visible rows have been loaded. It also uses a threshold to determine how early to pre-fetch rows (before a user scrolls to them)."), React.createElement(_ContentBox.ContentBoxParagraph, null, React.createElement("div", {
        className: _InfiniteLoaderExample["default"].cacheButtonAndCountRow
      }, React.createElement("button", {
        className: _InfiniteLoaderExample["default"].button,
        onClick: this._clearData
      }, "Flush Cached Data"), React.createElement("div", {
        className: _InfiniteLoaderExample["default"].cacheCountRow
      }, loadingRowCount, " loading, ", loadedRowCount, " loaded"))), React.createElement(_InfiniteLoader["default"], {
        isRowLoaded: this._isRowLoaded,
        loadMoreRows: this._loadMoreRows,
        rowCount: list.size
      }, function (_ref) {
        var onRowsRendered = _ref.onRowsRendered,
            registerChild = _ref.registerChild;
        return React.createElement(_AutoSizer["default"], {
          disableHeight: true
        }, function (_ref2) {
          var width = _ref2.width;
          return React.createElement(_List["default"], {
            ref: registerChild,
            className: _InfiniteLoaderExample["default"].List,
            height: 200,
            onRowsRendered: onRowsRendered,
            rowCount: list.size,
            rowHeight: 30,
            rowRenderer: _this2._rowRenderer,
            width: width
          });
        });
      }));
    }
  }, {
    key: "_clearData",
    value: function _clearData() {
      this.setState({
        loadedRowCount: 0,
        loadedRowsMap: {},
        loadingRowCount: 0
      });
    }
  }, {
    key: "_isRowLoaded",
    value: function _isRowLoaded(_ref3) {
      var index = _ref3.index;
      var loadedRowsMap = this.state.loadedRowsMap;
      return !!loadedRowsMap[index]; // STATUS_LOADING or STATUS_LOADED
    }
  }, {
    key: "_loadMoreRows",
    value: function _loadMoreRows(_ref4) {
      var _this3 = this;

      var startIndex = _ref4.startIndex,
          stopIndex = _ref4.stopIndex;
      var _this$state2 = this.state,
          loadedRowsMap = _this$state2.loadedRowsMap,
          loadingRowCount = _this$state2.loadingRowCount;
      var increment = stopIndex - startIndex + 1;

      for (var i = startIndex; i <= stopIndex; i++) {
        loadedRowsMap[i] = STATUS_LOADING;
      }

      this.setState({
        loadingRowCount: loadingRowCount + increment
      });
      var timeoutId = setTimeout(function () {
        var _this3$state = _this3.state,
            loadedRowCount = _this3$state.loadedRowCount,
            loadingRowCount = _this3$state.loadingRowCount;
        delete _this3._timeoutIdMap[timeoutId];

        for (var i = startIndex; i <= stopIndex; i++) {
          loadedRowsMap[i] = STATUS_LOADED;
        }

        _this3.setState({
          loadingRowCount: loadingRowCount - increment,
          loadedRowCount: loadedRowCount + increment
        });

        promiseResolver();
      }, 1000 + Math.round(Math.random() * 2000));
      this._timeoutIdMap[timeoutId] = true;
      var promiseResolver;
      return new Promise(function (resolve) {
        promiseResolver = resolve;
      });
    }
  }, {
    key: "_rowRenderer",
    value: function _rowRenderer(_ref5) {
      var index = _ref5.index,
          key = _ref5.key,
          style = _ref5.style;
      var list = this.context.list;
      var loadedRowsMap = this.state.loadedRowsMap;
      var row = list.get(index);
      var content;

      if (loadedRowsMap[index] === STATUS_LOADED) {
        content = row.name;
      } else {
        content = React.createElement("div", {
          className: _InfiniteLoaderExample["default"].placeholder,
          style: {
            width: row.size
          }
        });
      }

      return React.createElement("div", {
        className: _InfiniteLoaderExample["default"].row,
        key: key,
        style: style
      }, content);
    }
  }]);
  return InfiniteLoaderExample;
}(React.PureComponent);

exports["default"] = InfiniteLoaderExample;
(0, _defineProperty2["default"])(InfiniteLoaderExample, "contextTypes", {
  list: _propTypes["default"].instanceOf(_immutable["default"].List).isRequired
});