import md5 from "crypto-js/md5"; import encBase64 from "crypto-js/enc-base64"; export function isMacOS() { return /(Mac|iPhone|iPod|iPad)/i.test(navigator.platform); } export function isEditableElement(element) { return ( element.matches && element.matches("input, textarea, [contenteditable]") ); } export function clamp(n, x, y) { return Math.min(Math.max(n, x), y); } export function getLineHeight(element) { const computedStyle = window.getComputedStyle(element); const lineHeight = parseInt(computedStyle.lineHeight, 10); if (Number.isNaN(lineHeight)) { const clone = element.cloneNode(); clone.innerHTML = "
"; element.appendChild(clone); const singleLineHeight = clone.clientHeight; clone.innerHTML = "

"; const doubleLineHeight = clone.clientHeight; element.removeChild(clone); const lineHeight = doubleLineHeight - singleLineHeight; return lineHeight; } else { return lineHeight; } } export function selectElementContent(element) { const selection = window.getSelection(); const range = document.createRange(); range.selectNodeContents(element); selection.removeAllRanges(); selection.addRange(range); } export function smoothlyScrollToElement(element) { const { height } = element.getBoundingClientRect(); if (height < window.innerHeight) { element.scrollIntoView({ behavior: "smooth", block: "center" }); } else { element.scrollIntoView({ behavior: "smooth", block: "start" }); } } /** * Transforms a UTF8 string into base64 encoding. */ export function encodeBase64(string) { return btoa(unescape(encodeURIComponent(string))); } /** * Transforms base64 encoding into UTF8 string. */ export function decodeBase64(binary) { return decodeURIComponent(escape(atob(binary))); } /** * Generates a random string. */ export function randomId() { return randomString(24); } /** * Generates a random long string. */ export function randomToken() { return randomString(40); } function randomString(byteSize) { const array = new Uint8Array(byteSize); crypto.getRandomValues(array); const byteString = String.fromCharCode(...array); return btoa(byteString); } /** * Calculates MD5 of the given string and returns * the base64 encoded binary. */ export function md5Base64(string) { return md5(string).toString(encBase64); } /** * A simple throttle version that ensures * the given function is called at most once * within the given time window. */ export function throttle(fn, windowMs) { let ignore = false; return (...args) => { if (!ignore) { fn(...args); ignore = true; setTimeout(() => { ignore = false; }, windowMs); } }; } export function setFavicon(name) { let link = document.querySelector(`[rel="icon"]`); if (!link) { link = document.createElement("link"); link.rel = "icon"; document.head.appendChild(link); } link.href = `/${name}.svg`; } export function findChildOrThrow(element, selector) { const child = element.querySelector(selector); if (!child) { throw new Error( `expected a child matching ${selector}, but none was found` ); } return child; } export function cancelEvent(event) { // Cancel any default browser behavior. event.preventDefault(); // Stop event propagation (e.g. so it doesn't reach the editor). event.stopPropagation(); }