Fix Log Auto Scroll のソースコード

Fix Log Auto Scroll

Keeps log auto-scrolling unless user scrolls up
右端で折り返す
// ==UserScript==
// @name         Fix Log Auto Scroll
// @namespace    http://tampermonkey.net/
// @version      1.1
// @description  Keeps log auto-scrolling unless user scrolls up
// @match        *://*.idleartisan.com/*
// @grant        none
// @license      MIT
// ==/UserScript==

(function() {
    'use strict';

    const waitForLog = setInterval(() => {
        const log = document.querySelector('#log-messages');
        if (!log) return;
        clearInterval(waitForLog);

        let autoScroll = true; // start with auto-scroll enabled

        const scrollToBottom = () => {
            if (log.scrollHeight > log.clientHeight) {
                log.scrollTop = 0; // column-reverse: scrollTop=0 is bottom
            }
        };

        // Initial scroll
        setTimeout(scrollToBottom, 50);

        // Toggle auto-scroll with Ctrl+C
        document.addEventListener('keydown', (e) => {
            if (e.altKey && e.key.toLowerCase() === 'c') {
                autoScroll = !autoScroll;
                console.log(`Auto-scroll ${autoScroll ? 'enabled' : 'paused'}`);
            }
        });

        // Watch for new messages
        const observer = new MutationObserver(() => {
            if (autoScroll) {
                scrollToBottom();
            }
        });

        observer.observe(log, { childList: true, subtree: true });
    }, 200);
})();