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* @module Modules/XIntersectionObserver
*/
import * as MH from "@lisn/globals/minification-helpers";
export type XIntersectionObserverCallback = (
entries: IntersectionObserverEntry[],
observer: XIntersectionObserver,
) => void;
/**
* {@link XIntersectionObserver} is an extension of
* {@link https://developer.mozilla.org/en-US/docs/Web/API/IntersectionObserver | IntersectionObserver}
* with added capabilities:
* - can skip the initial callback that happens shortly after setting up via
* {@link observeLater}
*/
export class XIntersectionObserver {
/**
* Like {@link https://developer.mozilla.org/en-US/docs/Web/API/IntersectionObserver/root | IntersectionObserver:root}.
*/
readonly root!: Element | Document | null;
/**
* Like {@link https://developer.mozilla.org/en-US/docs/Web/API/IntersectionObserver/rootMargin | IntersectionObserver:rootMargin}.
*/
readonly rootMargin!: string;
/**
* Like {@link https://developer.mozilla.org/en-US/docs/Web/API/IntersectionObserver/thresholds | IntersectionObserver:thresholds}.
*/
readonly thresholds!: number[];
/**
* Like {@link https://developer.mozilla.org/en-US/docs/Web/API/IntersectionObserver/observe | IntersectionObserver:observe} except it accepts multiple
* targets.
*/
readonly observe: (...targets: Element[]) => void;
/**
* Like {@link observe} but it ignores the initial almost immediate callback
* and only calls the callback on a subsequent intersection change.
*/
readonly observeLater: (...targets: Element[]) => void;
/**
* Like {@link https://developer.mozilla.org/en-US/docs/Web/API/IntersectionObserver/unobserve | IntersectionObserver:unobserve} except it accepts multiple
* targets.
*/
readonly unobserve: (...targets: Element[]) => void;
/**
* Like {@link https://developer.mozilla.org/en-US/docs/Web/API/IntersectionObserver/disconnect | IntersectionObserver:disconnect}.
*/
readonly disconnect: () => void;
/**
* Like `IntersectionObserver.takeRecords`.
*/
readonly takeRecords: () => void;
constructor(
callback: XIntersectionObserverCallback,
observeOptions?: IntersectionObserverInit,
) {
let observedTargets = MH.newWeakSet<Element>();
const targetsToSkip = MH.newWeakSet<Element>();
const intersectionHandler = (entries: IntersectionObserverEntry[]) => {
const selectedEntries = [];
for (const entry of entries) {
if (targetsToSkip.has(MH.targetOf(entry))) {
MH.deleteKey(targetsToSkip, MH.targetOf(entry));
continue;
}
selectedEntries.push(entry);
}
if (MH.lengthOf(selectedEntries)) {
callback(selectedEntries, this);
}
};
const observer = MH.newIntersectionObserver(
intersectionHandler,
observeOptions,
);
MH.defineProperty(this, "root", { get: () => observer.root });
MH.defineProperty(this, "rootMargin", {
get: () => observer.rootMargin,
});
MH.defineProperty(this, "thresholds", {
get: () => observer.thresholds,
});
this.observe = (...targets) => {
for (const target of targets) {
observedTargets.add(target);
observer.observe(target);
}
};
this.observeLater = (...targets) => {
for (const target of targets) {
// Only skip them if not already observed, otherwise the initial
// (almost) immediate callback won't happen anyway.
if (observedTargets.has(target)) {
continue;
}
targetsToSkip.add(target);
this.observe(target);
}
};
this.unobserve = (...targets) => {
for (const target of targets) {
MH.deleteKey(observedTargets, target);
observer.unobserve(target);
}
};
this.disconnect = () => {
observedTargets = MH.newWeakSet();
observer.disconnect();
};
this.takeRecords = () => observer.takeRecords();
}
}
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