524 lines
20 KiB
JavaScript
524 lines
20 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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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; };
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exports["default"] = bigData;
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var _react = require("react");
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var _react2 = _interopRequireDefault(_react);
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var _propTypes = require("prop-types");
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var _propTypes2 = _interopRequireDefault(_propTypes);
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { "default": obj }; }
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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; }
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function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }
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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; }
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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); }
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var defaultHeight = 30;
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var rowDiff = 3; //行差值
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var treeTypeIndex = 0;
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function bigData(Table) {
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var _class, _temp, _initialiseProps;
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return _temp = _class = function (_Component) {
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_inherits(BigData, _Component);
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function BigData(props) {
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_classCallCheck(this, BigData);
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var _this2 = _possibleConstructorReturn(this, _Component.call(this, props));
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_initialiseProps.call(_this2);
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_this2.state = {
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scrollLeft: 0,
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scrollTop: 0
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};
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var rowHeight = _this2.props.height ? _this2.props.height : defaultHeight;
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//默认显示25条，rowsInView根据定高算的。在非固定高下，这个只是一个大概的值。
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var scrollY = _this2.props.scroll.y ? parseInt(_this2.props.scroll.y) : 0;
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_this2.rowsInView = scrollY ? Math.ceil(scrollY / rowHeight) : 20;
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_this2.currentIndex = 0;
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_this2.loadCount = props.loadBuffer ? _this2.rowsInView + props.loadBuffer * 2 : 26; //一次加载多少数据
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_this2.cachedRowHeight = []; //缓存每行的高度
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_this2.cachedRowParentIndex = [];
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_this2.expandChildRowKeys = [];
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_this2.firstLevelKey = [];
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_this2.keys = [];
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_this2.lastScrollTop = 0;
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_this2.currentScrollTop = 0;
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_this2.startIndex = _this2.currentIndex; //数据开始位置
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_this2.endIndex = _this2.currentIndex + _this2.loadCount; //数据结束位置
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_this2.setRowHeight = _this2.setRowHeight.bind(_this2);
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_this2.setRowParentIndex = _this2.setRowParentIndex.bind(_this2);
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return _this2;
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}
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BigData.prototype.componentWillReceiveProps = function componentWillReceiveProps(nextProps) {
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var props = this.props;
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var currentIndex = nextProps.currentIndex,
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data = nextProps.data;
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var _this = this,
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dataLen = data.length;
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if (nextProps.scroll.y !== props.scroll.y) {
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var rowHeight = nextProps.height ? nextProps.height : defaultHeight;
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var scrollY = nextProps.scroll.y ? parseInt(nextProps.scroll.y) : 0;
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_this.rowsInView = scrollY ? Math.ceil(scrollY / rowHeight) : 20;
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_this.loadCount = props.loadBuffer ? _this.rowsInView + props.loadBuffer * 2 : 26; //一次加载多少数据
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_this.currentIndex = 0;
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_this.startIndex = _this.currentIndex; //数据开始位置
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_this.endIndex = _this.currentIndex + _this.loadCount; //数据结束位置
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}
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if (nextProps.data !== props.data) {
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_this.computeCachedRowParentIndex(nextProps.data);
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if (nextProps.data.length > 0) {
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_this.endIndex = _this.currentIndex - this.loadBuffer + _this.loadCount; //数据结束位置
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}
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}
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//如果传currentIndex，会判断该条数据是否在可视区域，如果没有的话，则重新计算startIndex和endIndex
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if (currentIndex !== -1 && currentIndex !== this.currentIndex) {
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_this.setStartAndEndIndex(currentIndex, dataLen);
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}
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};
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BigData.prototype.componentDidMount = function componentDidMount() {
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var data = this.props.data;
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this.computeCachedRowParentIndex(data);
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};
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/**
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*设置data中每个元素的parentIndex
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*
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*/
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BigData.prototype.setStartAndEndIndex = function setStartAndEndIndex(currentIndex, dataLen) {
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var _this = this;
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if (currentIndex > _this.currentIndex + _this.rowsInView) {
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_this.currentIndex = currentIndex;
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_this.endIndex = _this.currentIndex; //数据开始位置
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_this.startIndex = _this.currentIndex - _this.loadCount; //数据结束位置
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if (_this.endIndex > dataLen) {
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_this.endIndex = dataLen;
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}
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if (_this.startIndex < 0) {
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_this.startIndex = 0;
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}
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//重新设定scrollTop值
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_this.scrollTop = _this.getSumHeight(0, _this.endIndex - _this.rowsInView + 2);
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} else if (currentIndex < _this.currentIndex) {
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_this.currentIndex = currentIndex;
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_this.startIndex = currentIndex;
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_this.endIndex = currentIndex + _this.loadCount;
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if (_this.endIndex > dataLen) {
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_this.endIndex = dataLen;
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}
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if (_this.startIndex < 0) {
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_this.startIndex = 0;
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}
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//重新设定scrollTop值
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_this.scrollTop = _this.getSumHeight(0, _this.startIndex);
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}
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};
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BigData.prototype.getRowKey = function getRowKey(record, index) {
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var rowKey = this.props.rowKey;
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var key = typeof rowKey === "function" ? rowKey(record, index) : record[rowKey];
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return key;
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};
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/**
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*判断是否是树形结构
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*
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*/
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BigData.prototype.checkIsTreeType = function checkIsTreeType() {
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var data = this.props.data;
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var rs = false;
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var len = data.length > 30 ? 30 : data.length;
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//取前三十个看看是否有children属性，有则为树形结构
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for (var i = 0; i < len; i++) {
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if (data[i].children) {
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rs = true;
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break;
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}
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}
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return rs;
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};
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BigData.prototype.getData = function getData(data, parentIndex) {
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var _this3 = this;
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data.forEach(function (subItem, subIndex) {
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_this3.cachedRowParentIndex[treeTypeIndex] = parentIndex;
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_this3.keys[treeTypeIndex] = _this3.getRowKey(subItem, subIndex);
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treeTypeIndex++;
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if (subItem.children) {
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_this3.getData(subItem.children, parentIndex);
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}
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});
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};
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BigData.prototype.componentWillUnmount = function componentWillUnmount() {
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this.cachedRowHeight = [];
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this.cachedRowParentIndex = [];
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};
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/**
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*获取数据区高度
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*
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*
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**/
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BigData.prototype.getContentHeight = function getContentHeight() {
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if (!this.props.data) return 0;
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return this.getSumHeight(0, this.props.data.length);
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};
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BigData.prototype.getSumHeight = function getSumHeight(start, end) {
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var height = this.props.height;
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var rowHeight = height ? height : defaultHeight;
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var sumHeight = 0,
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currentKey = void 0,
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currentRowHeight = rowHeight;
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for (var i = start; i < end; i++) {
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if (this.cachedRowHeight[i] == undefined) {
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if (this.treeType) {
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currentKey = this.keys[i];
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currentRowHeight = 0;
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if (this.firstLevelKey.indexOf(currentKey) >= 0 || this.expandChildRowKeys.indexOf(currentKey) >= 0) {
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currentRowHeight = rowHeight;
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}
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}
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sumHeight += currentRowHeight;
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} else {
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sumHeight += this.cachedRowHeight[i];
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}
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}
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return sumHeight;
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};
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/**
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*@description 根据返回的scrollTop计算当前的索引。此处做了两次缓存一个是根据上一次的currentIndex计算当前currentIndex。另一个是根据当前内容区的数据是否在缓存中如果在则不重新render页面
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*@param 最新一次滚动的scrollTop
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*@param treeType是否是树状表
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*/
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BigData.prototype.setRowHeight = function setRowHeight(height, index) {
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this.cachedRowHeight[index] = height;
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};
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BigData.prototype.setRowParentIndex = function setRowParentIndex(parentIndex, index) {}
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// this.cachedRowParentIndex[index] = parentIndex;
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/**
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*
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*根据当前行号获取该行的父节点行号
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* @param {*} currentIndex 当前行号
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*/
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;
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BigData.prototype.getParentIndex = function getParentIndex(targetIndex) {
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var data = this.props.data;
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var parentIndex = -1;
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parentIndex = this.getIndex(data, -1, targetIndex);
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if (parentIndex < 0) {
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//小于0说明没有展开的子节点
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parentIndex = targetIndex;
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}
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return parentIndex;
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};
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BigData.prototype.getIndex = function getIndex(data, index, targetIndex) {
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var parentIndex = index;
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for (var i = 0; i < data.length; i++) {
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index++;
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if (targetIndex <= index) {
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break;
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}
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if (data[i].children) {
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this.getIndex(data[i].children, index, targetIndex);
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}
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}
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return parentIndex;
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};
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BigData.prototype.render = function render() {
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var data = this.props.data;
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var scrollTop = this.scrollTop;
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var endIndex = this.endIndex,
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startIndex = this.startIndex;
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if (startIndex < 0) {
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startIndex = 0;
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}
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if (endIndex < 0) {
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endIndex = 0;
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}
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if (endIndex > data.length) {
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endIndex = data.length;
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}
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var lazyLoad = {
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startIndex: startIndex,
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startParentIndex: startIndex //为树状节点做准备
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};
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if (this.treeType) {
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var preSubCounts = this.cachedRowParentIndex.findIndex(function (item) {
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return item == startIndex;
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});
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var sufSubCounts = this.cachedRowParentIndex.findIndex(function (item) {
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return item == endIndex;
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});
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lazyLoad.preHeight = this.getSumHeight(0, preSubCounts > -1 ? preSubCounts : 0);
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lazyLoad.sufHeight = this.getSumHeight(sufSubCounts + 1 > 0 ? sufSubCounts + 1 : this.cachedRowParentIndex.length, this.cachedRowParentIndex.length);
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if (preSubCounts > 0) {
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lazyLoad.startIndex = preSubCounts;
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}
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} else {
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lazyLoad.preHeight = this.getSumHeight(0, startIndex);
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lazyLoad.sufHeight = this.getSumHeight(endIndex, data.length);
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}
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// console.log('*******ScrollTop*****'+scrollTop);
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return _react2["default"].createElement(Table, _extends({}, this.props, {
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data: data.slice(startIndex, endIndex),
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lazyLoad: lazyLoad,
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handleScrollY: this.handleScrollY,
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scrollTop: scrollTop,
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setRowHeight: this.setRowHeight,
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setRowParentIndex: this.setRowParentIndex,
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onExpand: this.onExpand,
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onExpandedRowsChange: this.onExpandedRowsChange
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// className={'lazy-table'}
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}));
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};
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return BigData;
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}(_react.Component), _class.defaultProps = {
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data: [],
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loadBuffer: 5,
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rowKey: "key",
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onExpand: function onExpand() {},
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scroll: {},
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currentIndex: -1,
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isTree: false
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}, _class.propTypes = {
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loadBuffer: _propTypes2["default"].number
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}, _initialiseProps = function _initialiseProps() {
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var _this4 = this;
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this.computeCachedRowParentIndex = function (data) {
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var isTree = _this4.props.isTree;
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var isTreeType = isTree ? true : _this4.checkIsTreeType();
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if (isTreeType) {
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data.forEach(function (item, index) {
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_this4.firstLevelKey[index] = _this4.getRowKey(item, index);
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_this4.cachedRowParentIndex[treeTypeIndex] = index;
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//保存所有的keys跟小标对应起来
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_this4.keys[treeTypeIndex] = _this4.getRowKey(item, index);
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treeTypeIndex++;
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if (item.children) {
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_this4.getData(item.children, index);
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}
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});
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}
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};
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this.handleScrollY = function (nextScrollTop, treeType) {
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//树表逻辑
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// 关键点是动态的获取startIndex和endIndex
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// 法子一：子节点也看成普通tr，最开始需要设置一共有多少行，哪行显示哪行不显示如何确定
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// 动态取start = current+buffer对应的父节点、end = start+loadCount+row的height为0的行数 展开节点的下一个节点作为end值，
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var _this = _this4;
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var _this$props = _this.props,
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data = _this$props.data,
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height = _this$props.height,
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_this$props$scroll = _this$props.scroll,
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scroll = _this$props$scroll === undefined ? {} : _this$props$scroll,
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loadBuffer = _this$props.loadBuffer;
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var rowHeight = height ? height : defaultHeight;
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var _this$currentIndex = _this.currentIndex,
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currentIndex = _this$currentIndex === undefined ? 0 : _this$currentIndex,
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loadCount = _this.loadCount,
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scrollTop = _this.scrollTop,
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currentScrollTop = _this.currentScrollTop;
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var endIndex = _this.endIndex,
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startIndex = _this.startIndex;
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var needRender = _this.state.needRender;
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_this.scrollTop = nextScrollTop;
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var viewHeight = parseInt(scroll.y);
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_this.treeType = treeType;
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// let index = currentIndex;//记录下次当前位置
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// let temp = currentIndex ?nextScrollTop - currentScrollTop:nextScrollTop;
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// const isOrder = temp > 0 ?true:false;//true为向下滚动、false为向上滚动
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// //根据scrollTop计算下次当前索引的位置
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// if(isOrder){
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// while (temp > 0) {
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// temp -= this.cachedRowHeight[index] || rowHeight
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// if(temp > 0){
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// index += 1
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// //保存当前index对应的scrollTop
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// this.currentScrollTop += this.cachedRowHeight[index]|| rowHeight;
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// }
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// }
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// }else{
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// while(temp < 0){
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// temp += this.cachedRowHeight[index] || rowHeight
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// if(temp < 0){
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// index -= 1
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// this.currentScrollTop -= this.cachedRowHeight[index]|| rowHeight;
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// }
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// }
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// }
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var index = 0;
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var temp = nextScrollTop;
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var currentKey = void 0;
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while (temp > 0) {
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var currentRowHeight = _this4.cachedRowHeight[index];
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if (currentRowHeight === undefined) {
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if (_this4.treeType) {
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currentKey = _this4.keys[index];
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currentRowHeight = 0;
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if (_this4.firstLevelKey.indexOf(currentKey) >= 0 || _this4.expandChildRowKeys.indexOf(currentKey) >= 0) {
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currentRowHeight = rowHeight;
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}
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} else {
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currentRowHeight = rowHeight;
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}
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}
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temp -= currentRowHeight;
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if (temp > 0) {
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index += 1;
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}
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}
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// console.log('currentIndex****',index);
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var isOrder = index - currentIndex > 0 ? true : false;
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if (index < 0) index = 0;
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//如果之前的索引和下一次的不一样则重置索引和滚动的位置
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if (currentIndex !== index) {
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_this.currentIndex = index;
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var rowsInView = 0; //可视区域显示多少行
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var rowsHeight = 0; //可视区域内容高度
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var tempIndex = index;
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//如果可视区域中需要展示的数据已经在缓存中则不重现render。
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if (viewHeight) {
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//有时滚动过快时this.cachedRowHeight[rowsInView + index]为undifined
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while (rowsHeight < viewHeight && tempIndex < _this4.cachedRowHeight.length) {
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if (_this4.cachedRowHeight[tempIndex]) {
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rowsHeight += _this4.cachedRowHeight[tempIndex];
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if (treeType && _this.cachedRowParentIndex[tempIndex] !== tempIndex || !treeType) {
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rowsInView++;
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}
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}
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tempIndex++;
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}
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if (treeType) {
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var treeIndex = index;
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index = _this.cachedRowParentIndex[treeIndex];
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if (index === undefined) {
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// console.log('index is undefined********'+treeIndex);
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index = _this4.getParentIndex(treeIndex);
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// console.log("getParentIndex****"+index);
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}
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}
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// console.log('parentIndex*********',index);
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// 如果rowsInView 小于 缓存的数据则重新render
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// 向下滚动 下临界值超出缓存的endIndex则重新渲染
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if (rowsInView + index > endIndex - rowDiff && isOrder) {
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startIndex = index - loadBuffer > 0 ? index - loadBuffer : 0;
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endIndex = startIndex + loadCount;
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//树状结构则根据当前的节点重新计算startIndex和endIndex
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// if(treeType){
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// const currentParentIndex = _this.cachedRowParentIndex[index];
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// startIndex = currentParentIndex - loadBuffer>0?currentParentIndex - loadBuffer:0;
|
||
// endIndex = startIndex + loadCount;
|
||
// // console.log(endIndex,"endIndex的parentIndex",parentEndIndex);
|
||
// // endIndex = parentEndIndex +1
|
||
// }else{
|
||
// startIndex = index - loadBuffer>0?index - loadBuffer:0;
|
||
// endIndex = startIndex + loadCount;
|
||
// }
|
||
if (endIndex > data.length) {
|
||
endIndex = data.length;
|
||
}
|
||
if (startIndex !== _this4.startIndex || endIndex !== _this4.endIndex) {
|
||
_this4.startIndex = startIndex;
|
||
_this4.endIndex = endIndex;
|
||
_this4.setState({ needRender: !needRender });
|
||
}
|
||
// console.log(
|
||
// "===================",
|
||
// "**index**" + index,
|
||
// " **startIndex**" + this.startIndex,
|
||
// "**endIndex**" + this.endIndex
|
||
// );
|
||
}
|
||
// 向上滚动，当前的index是否已经加载（currentIndex），若干上临界值小于startIndex则重新渲染
|
||
if (!isOrder && index < startIndex + rowDiff) {
|
||
startIndex = index - loadBuffer;
|
||
if (startIndex < 0) {
|
||
startIndex = 0;
|
||
}
|
||
if (startIndex !== _this4.startIndex || endIndex !== _this4.endIndex) {
|
||
_this4.startIndex = startIndex;
|
||
_this4.endIndex = _this4.startIndex + loadCount;
|
||
_this4.setState({ needRender: !needRender });
|
||
}
|
||
// console.log(
|
||
// "**index**" + index,
|
||
// "**startIndex**" + this.startIndex,
|
||
// "**endIndex**" + this.endIndex
|
||
// );
|
||
}
|
||
}
|
||
}
|
||
};
|
||
|
||
this.onExpand = function (expandState, record) {
|
||
var _this = _this4;
|
||
// 展开
|
||
if (expandState) {
|
||
record.children && record.children.forEach(function (item, index) {
|
||
_this.expandChildRowKeys.push(_this.getRowKey(item, index));
|
||
});
|
||
} else {
|
||
// 收起
|
||
record.children && record.children.forEach(function (item, index) {
|
||
_this.expandChildRowKeys.splice(_this.expandChildRowKeys.findIndex(function (fitem) {
|
||
return fitem.key === item.key;
|
||
}), 1);
|
||
});
|
||
}
|
||
|
||
_this.props.onExpand(expandState, record);
|
||
};
|
||
}, _temp;
|
||
}
|
||
module.exports = exports["default"]; |