@tanstack/solid-router/dist/esm/utils.js

Modern and scalable routing for Solid applications

import * as Solid from "solid-js";
//#region src/utils.ts
/**
* React hook to wrap `IntersectionObserver`.
*
* This hook will create an `IntersectionObserver` and observe the ref passed to it.
*
* When the intersection changes, the callback will be called with the `IntersectionObserverEntry`.
*
* @param ref - The ref to observe
* @param callback - The callback to call when the intersection changes
* @param disabled - Whether observation is disabled
* @returns The IntersectionObserver instance
* @example
* ```tsx
* const MyComponent = () => {
* const ref = React.useRef<HTMLDivElement>(null)
* useIntersectionObserver(
*  ref,
*  (entry) => { doSomething(entry) },
*  false
* )
* return <div ref={ref} />
* ```
*/
function useIntersectionObserver(ref, callback, disabled) {
	const isIntersectionObserverAvailable = typeof IntersectionObserver === "function";
	let observerRef = null;
	Solid.createEffect(() => {
		const r = ref();
		if (disabled() || !r || !isIntersectionObserverAvailable) {
			Solid.onCleanup(() => callback());
			return;
		}
		observerRef = new IntersectionObserver((entries) => {
			callback(entries.pop());
		}, { rootMargin: "100px" });
		observerRef.observe(r);
		Solid.onCleanup(() => {
			observerRef?.disconnect();
			callback();
		});
	});
	return () => observerRef;
}
//#endregion
export { useIntersectionObserver };

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