// ==UserScript==
// @name               Auto Dark Scrollbar
// @name:zh-CN         自动深色滚动条
// @namespace          http://tampermonkey.net/
// @version            0.7
// @description        Apply dark scrollbar for dark pages
// @description:zh-CN  对深色页面自动应用深色滚动条
// @author             TGSAN
// @match              *://*/*
// @grant              none
// ==/UserScript==
(function() {
'use strict';
function parseColor(color) {
var x = document.createElement('div');
document.body.appendChild(x);
var rgba;
var red = 0, green = 0, blue = 0, alpha = 0;
try {
x.style = 'color: ' + color + '!important';
color = window.getComputedStyle(x).color;
rgba = color.match(/rgba?\((.*)\)/)[1].split(',').map(Number);
red = rgba[0];
green = rgba[1];
blue = rgba[2];
alpha = '3' in rgba ? rgba[3] : 1;
}
catch (e) { }
x.parentNode.removeChild(x);
return { 'red': red, 'green': green, 'blue': blue, 'alpha': alpha };
}
function updateStyle() {
let bodyColor = parseColor(window.getComputedStyle(document.body, null)['background-color']);
let globalElementColor = parseColor(window.getComputedStyle(document.documentElement, null)['background-color']);
let bodyColorIsLight = (bodyColor.alpha == 0 || (((bodyColor.red + bodyColor.green + bodyColor.blue) / 3) >= 128));
let globalElementColorIsLight = (globalElementColor.alpha == 0 || (((globalElementColor.red + globalElementColor.green + globalElementColor.blue) / 3) >= 128));
let htmlTheme = window.document.querySelector("html").getAttribute("data-theme");
let htmlThemeIsLight = (htmlTheme == null || htmlTheme == "light");
let isLight = bodyColorIsLight && globalElementColorIsLight && htmlThemeIsLight;
// 添加样式（通用）
if (isLight) {
style.innerText = ":root { color-scheme: light !important; }";
} else {
style.innerText = ":root { color-scheme: dark !important; }";
}
}
let style = document.createElement("style");
document.head.appendChild(style);
style.type = "text/css";
document.addEventListener("load", function() {
updateStyle();
});
window.addEventListener("load", function() {
updateStyle();
});
document.body.addEventListener("load", function() {
updateStyle();
});
updateStyle();
setInterval(updateStyle, 1000);
})();