@qn-pandora/pandora-visualization/es/modules/chart-wrapper/ViewPortWatcher/index.js

Pandora 通用可视化库

var __extends = (this && this.__extends) || (function () {
    var extendStatics = function (d, b) {
        extendStatics = Object.setPrototypeOf ||
            ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
            function (d, b) { for (var p in b) if (Object.prototype.hasOwnProperty.call(b, p)) d[p] = b[p]; };
        return extendStatics(d, b);
    };
    return function (d, b) {
        extendStatics(d, b);
        function __() { this.constructor = d; }
        d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
    };
})();
import * as React from 'react';
import { get } from 'lodash';
import BasicComponent from '../../../components/Base/BasicComponent';
var ViewPortWatcher = /** @class */ (function (_super) {
    __extends(ViewPortWatcher, _super);
    function ViewPortWatcher() {
        var _this = _super !== null && _super.apply(this, arguments) || this;
        _this.io = new IntersectionObserver(function (entries) {
            var onChange = _this.props.onChange;
            if (!onChange || entries.length < 1) {
                return;
            }
            // 由于未知原因entries可能会出现多个的情况，因此这里改成取最后一个
            var isIntersecting = get(entries[entries.length - 1], 'isIntersecting') || false;
            onChange(isIntersecting);
        });
        return _this;
    }
    ViewPortWatcher.prototype.componentDidMount = function () {
        var _this = this;
        this.io.observe(this.getRootDOM());
        this.addDisposer(function () {
            _this.io.disconnect();
        });
    };
    ViewPortWatcher.prototype.render = function () {
        return (React.createElement("div", { className: this.props.className, ref: this.setRootRef }, this.props.children));
    };
    return ViewPortWatcher;
}(BasicComponent));
export default ViewPortWatcher;