Automatically toggle built-in dark mode on youtube.com
/* Copyright (C) 2020 Nathaniel Wu
* Modified from ytAutoDark. Automatically toggle Youtube built-in dark theme.
* Copyright (C) 2019-2020 Victor VOISIN
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*/
// ==UserScript==
// @name YouTube Auto Dark Mode
// @namespace http://tampermonkey.net/
// @version 3.0.3
// @description Automatically toggle built-in dark mode on youtube.com
// @author Victor VOISIN, Nathaniel Wu
// @include *www.youtube.com/*
// @license GPL-3.0-or-later
// @grant none
// ==/UserScript==
(function () {
'use strict';
/**
* Is dark theme enabled ?
*/
const isDarkThemeEnabled = () => {
return Boolean(document.querySelector('html').hasAttribute('dark'));
};
/**
* Three dot menu button.
*/
const isMenuButtonAvailableInDom = () => {
return Boolean(
document.querySelectorAll('ytd-topbar-menu-button-renderer')[2],
);
};
const clickMenu = () => {
document.querySelectorAll('ytd-topbar-menu-button-renderer')[2].click();
};
const isMenuOpen = () => {
return (
document.querySelector('iron-dropdown') &&
!document.querySelector('iron-dropdown').getAttribute('aria-hidden')
);
};
const isMenuLoading = () => {
return !document.getElementById('spinner');
};
/**
* Link arrow to dark theme popup.
*/
const isCompactLinkAvailableInDom = () => {
return Boolean(
document.querySelector('ytd-toggle-theme-compact-link-renderer'),
);
};
const clickRenderer = () => {
document.querySelector('ytd-toggle-theme-compact-link-renderer').click();
};
const isRendererOpen = () => {
return !(
document.getElementById('submenu') &&
Boolean(document.getElementById('submenu').hasAttribute('hidden'))
);
};
const isRendererLoading = () => {
return !(
document.querySelector('#spinner.ytd-multi-page-menu-renderer') &&
document
.querySelector('#spinner.ytd-multi-page-menu-renderer')
.hasAttribute('hidden')
);
};
/**
* Check theme menu.
*/
const ThemeMenuType = {
"none": 0,
"toggle": 1,
"menu": 2
}
const isThemeMenuAvailableInDom = () => {
let ret = ThemeMenuType.none;
if (Boolean(document.querySelector('#caption-container > paper-toggle-button')))
ret = ThemeMenuType.toggle;
else if (Boolean(document.querySelector('ytd-multi-page-menu-renderer > #submenu #container #sections #items > ytd-compact-link-renderer')))
ret = ThemeMenuType.menu;
return ret;
};
/**
* Toggle dark theme by clicking element in DOM.
*/
const toggleDarkTheme = () => {
let themeMenuType;
if (isCompactLinkAvailableInDom() && (themeMenuType = isThemeMenuAvailableInDom())) {
switch (themeMenuType) {
case ThemeMenuType.toggle: {
document
.querySelector('#caption-container > paper-toggle-button')
.click();
break;
}
case ThemeMenuType.menu: {
document
.querySelector(`ytd-multi-page-menu-renderer > #submenu #container #sections #items > ytd-compact-link-renderer:nth-of-type(${isDarkThemeEnabled() ? 4 : 3})`)
.click();
break;
}
default: {
console.log('Unknown theme menu type');
}
}
} else {
setTimeout(() => {
window.requestAnimationFrame(tryTogglingDarkMode);
}, 50);
}
};
/**
* Wait for all elements to exist in DOM then toggle
* Step 1: Wait for 3 dots menu in DOM.
* Step 2: Click on 3 dots to open menu.
* Step 3: Wait for menu to finish loading.
* Step 4: Waiting for link to sub-menu (Should be optional now, because of step 3).
* Step 5: Click to open sub-menu (renderer pane).
* Step 6: Wait for sub-menu to finish loading.
* Step 7: Toggle dark theme.
* Step 8: Close menu.
*/
let start = null;
const tryTogglingDarkMode = timestamp => {
// Compute runtime
if (!start) {
start = timestamp;
}
const runtime = timestamp - start;
// Try to toggle only during 10s
if (runtime < 10000) {
if (!isMenuButtonAvailableInDom()) {
setTimeout(() => {
window.requestAnimationFrame(tryTogglingDarkMode);
}, 50);
} else if (!isMenuOpen()) {
clickMenu();
setTimeout(() => {
window.requestAnimationFrame(tryTogglingDarkMode);
}, 50);
} else if (isMenuLoading()) {
setTimeout(() => {
window.requestAnimationFrame(tryTogglingDarkMode);
}, 50);
} else if (isMenuOpen() && !isCompactLinkAvailableInDom()) {
setTimeout(() => {
window.requestAnimationFrame(tryTogglingDarkMode);
}, 50);
} else if (!isRendererOpen()) {
clickRenderer();
setTimeout(() => {
window.requestAnimationFrame(tryTogglingDarkMode);
}, 50);
} else if (isRendererOpen() && isRendererLoading()) {
setTimeout(() => {
window.requestAnimationFrame(tryTogglingDarkMode);
}, 50);
} else {
toggleDarkTheme();
// clickRenderer(); // Close dark theme menu
if (isMenuOpen()) {
clickMenu();
}
}
} else {
// Timeout with new activation process. Try the old one.
setTimeout(() => {
window.requestAnimationFrame(tryTogglingDarkModeTheOldWay);
}, 50);
}
};
/**
* @Deprecated
* Old way of doing things.
* Kept here for backward compatibility.
* Will be removed in a few month.
*/
/**
* @Deprecated
*/
const openCloseMenu = () => {
document.querySelectorAll('ytd-topbar-menu-button-renderer')[2].click();
document.querySelectorAll('ytd-topbar-menu-button-renderer')[2].click();
};
/**
* @Deprecated
*/
const openCloseRenderer = () => {
document.querySelector('ytd-toggle-theme-compact-link-renderer').click();
document.querySelector('ytd-toggle-theme-compact-link-renderer').click();
};
/**
* @Deprecated
*/
let startOldWay = null;
const tryTogglingDarkModeTheOldWay = timestamp => {
// Compute runtime
if (!startOldWay) {
startOldWay = timestamp;
}
const runtime = timestamp - startOldWay;
// Try to toggle only during 5s
if (runtime < 5000) {
if (!isMenuButtonAvailableInDom()) {
window.requestAnimationFrame(tryTogglingDarkMode);
} else if (!isCompactLinkAvailableInDom()) {
openCloseMenu();
window.requestAnimationFrame(tryTogglingDarkMode);
} else if (!isThemeMenuAvailableInDom()) {
openCloseRenderer();
window.requestAnimationFrame(tryTogglingDarkMode);
} else {
toggleDarkTheme();
startOldWay = null;
}
}
};
const setDarkMode = on => {
const isDarkModeOn = isDarkThemeEnabled();
if (on) {
if (!isDarkModeOn) {
window.requestAnimationFrame(tryTogglingDarkMode);
}
} else if (isDarkModeOn) {
window.requestAnimationFrame(tryTogglingDarkMode);
}
};
const inIframe = () => {
try {
return window.self !== window.top;
} catch (e) {
return true;
}
}
/**
* Execute
*/
if (inIframe())
return;
if (window.matchMedia) {// if the browser/os supports system-level color scheme
setDarkMode(window.matchMedia('(prefers-color-scheme: dark)').matches);
window.matchMedia('(prefers-color-scheme: dark)').addEventListener('change', e => setDarkMode(e.matches));
} else {// otherwise use local time to decide
let hour = (new Date()).getHours();
setDarkMode(hour > 18 || hour < 8);
}
})();
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