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/**
* Main React app logic
*/
import React, { useState, useEffect, useCallback } from "react";
import Detail from "./Detail.js";
import Legend from "./Legend.js";
import buildGraph from "../graph.js";
export default function App() {
const [db, setDb] = useState(null);
const [node, setNode] = useState(null);
const [graph, setGraph] = useState(null);
const [selected, setSelected] = useState(null);
const [detailVisible, setDetailVisible] = useState(null);
useEffect(async () => {
const newDb = await loadDB();
setDb(newDb);
setGraph(
buildGraph(newDb, {
click: handleClick,
})
);
}, []);
const handleClick = useCallback((node) => {
setNode(node);
setDetailVisible(true);
});
const handleClose = useCallback((node) => {
setDetailVisible(false);
});
const handleSelect = useCallback((category) => {
if (category === selected) {
setSelected(null);
graph.onSelect(null);
} else {
setSelected(category);
graph.onSelect(category);
}
});
return (
<div>
<Detail node={node} visible={detailVisible} onClose={handleClose} />
<Legend
visible={!detailVisible}
selected={selected}
onSelect={handleSelect}
/>
</div>
);
}
async function loadDB() {
const request = await fetch("/assets/db.json");
return await request.json();
}
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