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@instructure
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ui-dom-utils
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getFontSize.js
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/* * The MIT License (MIT) * * Copyright (c) 2015 - present Instructure, Inc. * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in all * copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. */ import { canUseDOM } from './canUseDOM'; import { ownerDocument } from './ownerDocument'; import { getComputedStyle } from './getComputedStyle'; const COMPUTED_CACHE = new WeakMap(); /** * --- * category: utilities/DOM * --- * * Gets font size in px * * @module getFontSize * @param { Node | Window | React.ReactElement | React.Component | function | undefined | null } el - component or DOM node * @param { boolean } ignoreCache * @returns { number } font size in px */ function getFontSize(el, ignoreCache = false) { var _ownerDocument; if (!canUseDOM) { return 16; } const container = el || ((_ownerDocument = ownerDocument(el)) === null || _ownerDocument === void 0 ? void 0 : _ownerDocument.documentElement); // return the cached font size if it's there const cachedValue = COMPUTED_CACHE.get(container); if (!ignoreCache && cachedValue) { return cachedValue; } const fontSize = parseInt(getComputedStyle(container).getPropertyValue('font-size')); // cache the computed font size so that we don't have to compute it again COMPUTED_CACHE.set(container, fontSize); return fontSize; } export default getFontSize; export { getFontSize };