unicorn-utterances/content/blog/ffg-fundamentals-element-reference/ffg-fundamentals-react-element-ref-challenge-65/src/main.jsx

import { createRoot } from "react-dom/client";
import { useRef, useState, useEffect } from "react";

function App() {
	const buttonRef = useRef();

	const mouseOverTimeout = useRef();

	const [tooltipMeta, setTooltipMeta] = useState({
		x: 0,
		y: 0,
		height: 0,
		width: 0,
		show: false,
	});

	const onMouseOver = () => {
		mouseOverTimeout.current = setTimeout(() => {
			const bounding = buttonRef.current.getBoundingClientRect();
			setTooltipMeta({
				x: bounding.x,
				y: bounding.y,
				height: bounding.height,
				width: bounding.width,
				show: true,
			});
		}, 1000);
	};

	const onMouseLeave = () => {
		setTooltipMeta({
			x: 0,
			y: 0,
			height: 0,
			width: 0,
			show: false,
		});
		clearTimeout(mouseOverTimeout.current);
	};

	useEffect(() => {
		return () => {
			clearTimeout(mouseOverTimeout.current);
		};
	}, []);

	return (
		<div style={{ padding: "10rem" }}>
			{tooltipMeta.show && (
				<div
					style={{
						display: "flex",
						overflow: "visible",
						justifyContent: "center",
						width: `${tooltipMeta.width}px`,
						position: "fixed",
						top: `${tooltipMeta.y - tooltipMeta.height - 16 - 6 - 8}px`,
						left: `${tooltipMeta.x}px`,
					}}
				>
					<div
						style={{
							whiteSpace: "nowrap",
							padding: "8px",
							background: "#40627b",
							color: "white",
							borderRadius: "16px",
						}}
					>
						This will send an email to the recipients
					</div>
					<div
						style={{
							height: "12px",
							width: "12px",
							transform: "rotate(45deg) translateX(-50%)",
							background: "#40627b",
							bottom: "calc(-6px - 4px)",
							position: "absolute",
							left: "50%",
							zIndex: -1,
						}}
					/>
				</div>
			)}
			<button
				onMouseOver={onMouseOver}
				onMouseLeave={onMouseLeave}
				ref={buttonRef}
			>
				Send
			</button>
		</div>
	);
}

createRoot(document.getElementById("root")).render(<App />);