221 lines
8.2 KiB
JavaScript
221 lines
8.2 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 = 40;
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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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_this2.rowsInView = _this2.props.scroll.y ? Math.ceil(_this2.props.scroll.y / rowHeight) : 25;
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_this2.currentIndex = 0;
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_this2.loadCount = 30; //一次加载多少数据
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_this2.cachedRowHeight = [];
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_this2.lastScrollTop = 0;
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_this2.startIndex = _this2.currentIndex;
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_this2.endIndex = _this2.currentIndex + _this2.loadCount;
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_this2.setRowHeight = _this2.setRowHeight.bind(_this2);
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return _this2;
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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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for (var i = start; i < end; i++) {
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sumHeight += this.cachedRowHeight[i] || rowHeight;
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}
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return sumHeight;
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};
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// getIndex(scrollTop = this.state.scrollTop) {
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// const { data } = this.props
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// const {rowsInView} = this;
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// const max = data.length
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// const mcf = scrollTop > 0.5 ? Math.ceil : Math.floor
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// let index = mcf((scrollTop * max) - (rowsInView * scrollTop))
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// if (index > max - rowsInView) index = max - rowsInView
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// if (index < 0) index = 0
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// return index
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// }
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// getLastRowHeight = (index) =>{
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// const { height, data } = this.props
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// const {rowsInView} = this;
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// if (index + rowsInView >= data.length) return 0
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// let lastRowHeight = 0
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// if (index >= 1 && index < data.length / 2) {
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// lastRowHeight = this.cachedRowHeight[index - 1] || height
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// }
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// return lastRowHeight
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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.render = function render() {
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var data = this.props.data;
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var currentIndex = this.currentIndex,
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scrollTop = this.scrollTop;
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var rowsInView = this.rowsInView,
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loadCount = this.loadCount,
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endIndex = this.endIndex,
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startIndex = this.startIndex;
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var lazyLoad = {
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preHeight: this.getSumHeight(0, startIndex),
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sufHeight: this.getSumHeight(endIndex, data.length),
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startIndex: startIndex
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};
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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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handleScroll: this.handleScroll,
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scrollTop: scrollTop,
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setRowHeight: this.setRowHeight
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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: undefined
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// height: 40, //默认行高
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}, _initialiseProps = function _initialiseProps() {
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var _this3 = this;
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this.handleScroll = function (nextScrollTop) {
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var _this = _this3;
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//将currentIndex放在this上，如果可视区域中需要展示的数据已经存在则不重现render。
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var _props = _this3.props,
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data = _props.data,
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height = _props.height,
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_props$scroll = _props.scroll,
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scroll = _props$scroll === undefined ? {} : _props$scroll;
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var rowHeight = height ? height : defaultHeight;
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var _this$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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var endIndex = _this.endIndex,
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startIndex = _this.startIndex;
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var needRender = _this.state.needRender;
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var index = 0;
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var temp = nextScrollTop;
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var viewHeight = parseInt(scroll.y);
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var isOrder = nextScrollTop > scrollTop ? true : false;
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while (temp > 0) {
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temp -= _this3.cachedRowHeight[index] || rowHeight;
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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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if (data.length - loadCount < index) index = data.length - loadCount;
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if (index < 0) index = 0;
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if (currentIndex !== index) {
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_this.currentIndex = index;
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_this.scrollTop = nextScrollTop;
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var rowsInView = 0;
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var rowsHeight = 0;
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//计算下一屏显示的数据条数
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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 && _this3.cachedRowHeight[rowsInView + index]) {
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rowsHeight += _this3.cachedRowHeight[rowsInView + index];
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rowsInView++;
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}
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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
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if (rowsInView + index > endIndex - 3 && isOrder) {
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_this3.startIndex = index;
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endIndex = _this3.startIndex + loadCount;
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if (endIndex > data.length - 1) {
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endIndex = data.length - 1;
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}
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_this3.endIndex = endIndex;
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_this3.setState({ needRender: !needRender });
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}
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// 向上滚动，当前的index是否已经加载（currentIndex）
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if (!isOrder && index < startIndex + 3) {
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startIndex = index - 15;
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if (startIndex < 0) {
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startIndex = 0;
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}
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_this3.startIndex = startIndex;
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_this3.endIndex = _this3.startIndex + loadCount;
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_this3.setState({ needRender: !needRender });
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}
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}
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console.log('**index**' + index, "**startIndex**" + _this3.startIndex, "**endIndex**" + _this3.endIndex);
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// this.setState({ scrollTop:scrollTop})
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}
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};
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}, _temp;
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}
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module.exports = exports["default"]; |