63 lines
2.0 KiB
JavaScript
63 lines
2.0 KiB
JavaScript
import { useEffect, useState } from 'react';
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import { loadAsync, isLoaded } from './Font';
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function isMapLoaded(map) {
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if (typeof map === 'string') {
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return isLoaded(map);
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}
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else {
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return Object.keys(map).every((fontFamily) => isLoaded(fontFamily));
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}
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}
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function useRuntimeFonts(map) {
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const [loaded, setLoaded] = useState(
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// For web rehydration, we need to check if the fonts are already loaded during the static render.
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// Native will also benefit from this optimization.
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isMapLoaded(map));
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const [error, setError] = useState(null);
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useEffect(() => {
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let isMounted = true;
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loadAsync(map)
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.then(() => {
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if (isMounted) {
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setLoaded(true);
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}
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})
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.catch((error) => {
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if (isMounted) {
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setError(error);
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}
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});
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return () => {
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isMounted = false;
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};
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}, []);
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return [loaded, error];
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}
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function useStaticFonts(map) {
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loadAsync(map);
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return [true, null];
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}
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// @needsAudit
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/**
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* Load a map of fonts at runtime with [`loadAsync`](#loadasyncfontfamilyorfontmap-source). This returns `true` if the fonts are
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* loaded and ready to use. It also returns an error if something went wrong, to use in development.
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*
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* > Note, the fonts are not "reloaded" when you dynamically change the font map.
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*
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* @param map A map of `fontFamily`s to [`FontSource`](#fontsource)s. After loading the font you can
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* use the key in the `fontFamily` style prop of a `Text` element.
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*
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* @return
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* - __loaded__ (`boolean`) - A boolean to detect if the font for `fontFamily` has finished
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* loading.
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* - __error__ (`Error | null`) - An error encountered when loading the fonts.
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*
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* @example
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* ```tsx
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* const [loaded, error] = useFonts({
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* 'Inter-Black': require('./assets/fonts/Inter-Black.otf'),
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* });
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* ```
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*/
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export const useFonts = typeof window === 'undefined' ? useStaticFonts : useRuntimeFonts;
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//# sourceMappingURL=FontHooks.js.map
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