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useLoadFontFiles.js
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useLoadFontFiles.js
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/*
* Copyright 2020 Google LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* External dependencies
*/
import { useCallback } from 'react';
/**
* Internal dependencies
*/
import cleanForSlug from '../../../utils/cleanForSlug';
import getGoogleFontURL from '../../../utils/getGoogleFontURL';
/**
* This is a utility ensure that Promise.all return ONLY when all promises are processed.
*
* @param {Promise} promise Promise to be processed
* @return {Promise} Return a rejected or fulfilled Promise
*/
const reflect = (promise) => {
return promise.then(
(v) => ({ v, status: 'fulfilled' }),
(e) => ({ e, status: 'rejected' })
);
};
function useLoadFontFiles() {
/**
* Adds a <link> element to the <head> for a given font in case there is none yet.
*
* Allows dynamically enqueuing font styles when needed.
*
* @param {Array} fonts An array of fonts properties to create a valid FontFaceSet to inject and preload a font-face
* @return {Promise} Returns fonts loaded promise
*/
const maybeEnqueueFontStyle = useCallback((fonts) => {
return Promise.all(
fonts
.map(
async ({
font: { family, service, variants },
fontWeight,
fontStyle,
content,
}) => {
if (!family || service !== 'fonts.google.com') {
return null;
}
const handle = cleanForSlug(family);
const elementId = `${handle}-css`;
const fontFaceSet = `
${fontStyle || ''} ${fontWeight || ''} 0 '${family}'
`.trim();
const hasFontLink = () => document.getElementById(elementId);
const appendFontLink = () => {
return new Promise((resolve, reject) => {
const src = getGoogleFontURL([{ family, variants }], 'auto');
const fontStylesheet = document.createElement('link');
fontStylesheet.id = elementId;
fontStylesheet.href = src;
fontStylesheet.rel = 'stylesheet';
fontStylesheet.type = 'text/css';
fontStylesheet.media = 'all';
fontStylesheet.crossOrigin = 'anonymous';
fontStylesheet.addEventListener('load', () => resolve());
fontStylesheet.addEventListener('error', (e) => reject(e));
document.head.appendChild(fontStylesheet);
});
};
const ensureFontLoaded = () => {
if (!document?.fonts) {
return Promise.resolve();
}
return document.fonts
.load(fontFaceSet, content || '')
.then(() => document.fonts.check(fontFaceSet, content || ''));
};
if (!hasFontLink()) {
await appendFontLink();
}
return ensureFontLoaded();
}
)
.map(reflect)
);
}, []);
return maybeEnqueueFontStyle;
}
export default useLoadFontFiles;