@nteract/monaco-editor/lib/intersectionObserver.js

A React component for the monaco editor, tailored for nteract

"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.unobserve = exports.observe = void 0;
const intersectionObserver_1 = __importDefault(require("./polyfill/intersectionObserver"));
const monitoredIntersectables = new Map();
let viewPortObserver;
function getObserverSingleton() {
    if (!viewPortObserver) {
        const IntersectionObserverImpl = window.IntersectionObserver || intersectionObserver_1.default;
        viewPortObserver = new IntersectionObserverImpl((entries) => {
            for (const entry of entries) {
                const element = entry.target;
                const editor = monitoredIntersectables.get(element);
                if (editor) {
                    editor.onIntersecting(entry.isIntersecting);
                }
            }
        });
    }
    return viewPortObserver;
}
/**
 * Observe the element for viewport intersection events.
 * @param editor
 * @param element
 * @returns callback to unobserve the element
 */
function observe(intersectable, element) {
    monitoredIntersectables.set(element, intersectable);
    getObserverSingleton().observe(element);
    return () => unobserve(element);
}
exports.observe = observe;
/**
 * unobserve the element for viewport intersection events.
 * @param element the monitored html element
 */
function unobserve(element) {
    getObserverSingleton().unobserve(element);
    monitoredIntersectables.delete(element);
}
exports.unobserve = unobserve;
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