@data-client/react
Version:
Async State Management without the Management. REST, GraphQL, SSE, Websockets, Fetch
40 lines • 4.94 kB
JavaScript
import { useEffect, useRef } from 'react';
const fakeNavigation = {
addListener(name) {}
};
let _useNavigation = () => fakeNavigation;
import('@react-navigation/native').then(rn => {
_useNavigation = rn.useNavigation;
}).catch(() => {});
function useFocusEffect(effect, deps, runOnMount = false) {
let navigation;
// if we aren't in react-navigation context, just ignore focus events
try {
navigation = _useNavigation();
} catch (_unused) {
navigation = fakeNavigation;
}
const firstRenderRef = useRef(true);
useEffect(() => {
let onCancel;
const unsubscribe = navigation.addListener('focus', () => {
// don't run on first render - only refocuses
if (firstRenderRef.current) {
firstRenderRef.current = false;
} else {
if (onCancel) onCancel();
onCancel = effect();
}
});
if (runOnMount) {
onCancel = effect();
}
return () => {
if (unsubscribe) unsubscribe();
if (onCancel) onCancel();
};
// eslint-disable-next-line react-hooks/exhaustive-deps
}, deps);
}
export default useFocusEffect;
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