// ==UserScript==
// @name         Disable Page UpDown Animation
// @namespace    https://greasyfork.org/users/1111205-geekfox
// @version      1.2
// @description  Based on Eink-UpDown by Sonny Zhao. Disable page-turning animations for Chrome globally (applies to (Shift+) Spacebar and PgDown/PgUp keys). Note: If the "Allow access to file URLs" option is enabled in Tampermonkey's Manage Extension settings, it will also work for local PDF reading. However, this script does not affect frames within the browser.
// @author       GeekFox
// @match        *://*/*
// @grant        none
// @run-at       document-body
// @license      MIT
// @downloadURL none
// ==/UserScript==
(function () {
    'use strict';
    const scrollRatio = 0.9;

    // 添加全局键盘事件监听器
    document.addEventListener('keydown', function (e) {
        // 检查是否在输入元素中
        const inInput = (e.target.tagName === 'INPUT' || e.target.tagName === 'TEXTAREA' || e.target.isContentEditable);

        if (!inInput) {
            if (e.code === 'Space') {
                // 如果按住Shift键，向上滚动
                // 否则，向下滚动
                window.scrollBy(0, (e.shiftKey ? -1 : 1) * scrollRatio * window.innerHeight);
                e.preventDefault();
            } else if (e.code === 'PageDown') {
                window.scrollBy(0, scrollRatio * window.innerHeight);
                e.preventDefault();
            } else if (e.code === 'PageUp') {
                window.scrollBy(0, -scrollRatio * window.innerHeight);
                e.preventDefault();
            }
        }
    }, false);
})();