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Fix the centering of Google Play Books webreader content on monitors > 1760px width.
// ==UserScript==
// @name Google Play Books Webreader Centering
// @namespace http://tampermonkey.net/
// @version 0.1
// @description Fix the centering of Google Play Books webreader content on monitors > 1760px width.
// @author Geoffrey Parker <grp@gparker.co>
// @match *://books.googleusercontent.com/*
// @grant none
// ==/UserScript==
(async function() {
'use strict';
async function getElem(selector, maxRetries, retryInterval=100) {
var elem = document.querySelector(selector);
var retries = 0;
while (elem == null && !(retries >= maxRetries)) {
await new Promise(r => setTimeout(r, retryInterval)); // sleep (default 100ms)
elem = document.querySelector(selector); // try again
retries++;
}
return elem != null ? Promise.resolve(elem) : Promise.reject(new Error("Timeout waiting for element"));
}
try {
let elem = await getElem("body > div.gb-reader-container > div.gb-text-reader > div > table", 50);
elem.removeAttribute("style");
let elemObserver = new MutationObserver((mutationsList, observer) => elem.removeAttribute("style"));
elemObserver.observe(elem, {attributes: true, attributeFilter: ["style"]});
} catch (err) {
console.error("Could not center:", err);
}
})();