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Текущая директория: /usr/lib/node_modules/bitgo/node_modules/expo-font/build
Просмотр файла: ExpoFontLoader.web.js
import { CodedError, Platform } from 'expo-modules-core';
import FontObserver from 'fontfaceobserver';
import { FontDisplay } from './Font.types';
function getFontFaceStyleSheet() {
if (!Platform.isDOMAvailable) {
return null;
}
const styleSheet = getStyleElement();
return styleSheet.sheet ? styleSheet.sheet : null;
}
function getFontFaceRules() {
const sheet = getFontFaceStyleSheet();
if (sheet) {
// @ts-ignore: rule iterator
const rules = [...sheet.cssRules];
const items = [];
for (let i = 0; i < rules.length; i++) {
const rule = rules[i];
if (rule instanceof CSSFontFaceRule) {
items.push({ rule, index: i });
}
}
return items;
}
return [];
}
function getFontFaceRulesMatchingResource(fontFamilyName, options) {
const rules = getFontFaceRules();
return rules.filter(({ rule }) => {
return (rule.style.fontFamily === fontFamilyName &&
(options && options.display ? options.display === rule.style.fontDisplay : true));
});
}
export default {
get name() {
return 'ExpoFontLoader';
},
async unloadAllAsync() {
if (!Platform.isDOMAvailable)
return;
const element = document.getElementById(ID);
if (element && element instanceof HTMLStyleElement) {
document.removeChild(element);
}
},
async unloadAsync(fontFamilyName, options) {
const sheet = getFontFaceStyleSheet();
if (!sheet)
return;
const items = getFontFaceRulesMatchingResource(fontFamilyName, options);
for (const item of items) {
sheet.deleteRule(item.index);
}
},
async loadAsync(fontFamilyName, resource) {
if (!Platform.isDOMAvailable) {
return;
}
const canInjectStyle = document.head && typeof document.head.appendChild === 'function';
if (!canInjectStyle) {
throw new CodedError('ERR_WEB_ENVIRONMENT', `The browser's \`document.head\` element doesn't support injecting fonts.`);
}
const style = _createWebStyle(fontFamilyName, resource);
document.head.appendChild(style);
if (!isFontLoadingListenerSupported()) {
return;
}
return new FontObserver(fontFamilyName, { display: resource.display }).load();
},
};
const ID = 'expo-generated-fonts';
function getStyleElement() {
const element = document.getElementById(ID);
if (element && element instanceof HTMLStyleElement) {
return element;
}
const styleElement = document.createElement('style');
styleElement.id = ID;
styleElement.type = 'text/css';
return styleElement;
}
function _createWebStyle(fontFamily, resource) {
const fontStyle = `@font-face {
font-family: ${fontFamily};
src: url(${resource.uri});
font-display: ${resource.display || FontDisplay.AUTO};
}`;
const styleElement = getStyleElement();
// @ts-ignore: TypeScript does not define HTMLStyleElement::styleSheet. This is just for IE and
// possibly can be removed if it's unnecessary on IE 11.
if (styleElement.styleSheet) {
const styleElementIE = styleElement;
styleElementIE.styleSheet.cssText = styleElementIE.styleSheet.cssText
? styleElementIE.styleSheet.cssText + fontStyle
: fontStyle;
}
else {
const textNode = document.createTextNode(fontStyle);
styleElement.appendChild(textNode);
}
return styleElement;
}
function isFontLoadingListenerSupported() {
const { userAgent } = window.navigator;
// WebKit is broken https://github.com/bramstein/fontfaceobserver/issues/95
const isIOS = !!userAgent.match(/iPad|iPhone/i);
const isSafari = /^((?!chrome|android).)*safari/i.test(navigator.userAgent);
// Edge is broken https://github.com/bramstein/fontfaceobserver/issues/109#issuecomment-333356795
const isEdge = userAgent.includes('Edge');
// Internet Explorer
const isIE = userAgent.includes('Trident');
// Firefox
const isFirefox = userAgent.includes('Firefox');
return !isSafari && !isIOS && !isEdge && !isIE && !isFirefox;
}
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