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Applies a custom font, Vazirmatn, to all text elements on the current web page (YouTube).
// ==UserScript==
// @name Youtube Custom Font
// @version 0.1.1
// @author Amm1rr
// @description Applies a custom font, Vazirmatn, to all text elements on the current web page (YouTube).
// @homepage https://github.com/Amm1rr/
// @namespace amm1rr.youtube.custom.font
// @match https://*.youtube.*/*
// @icon https://cdn.jsdelivr.net/gh/Amm1rr/Userscripts@main/Youtube-Custom-Font/Icon.png
// @grant none
// @license MIT
// ==/UserScript==
// Description:
// This script injects a small "bubble float button" on the top left corner of the YouTube page.
// Clicking the button applies a custom font, Vazirmatn, to all text elements on the webpage.
// You can customize the font family and element selector to your preference.
(function () {
// Configuration object for easy customization
const config = {
fontFamily: "Vazirmatn",
// selector: ".style-scope", //Youtube Class
selector: "*",
buttonID: "yt-custom-font",
buttonText: "A",
notificationDuration: 2000,
buttonFadeDuration: 2000,
notificationMessage: "Fonts updated: Vazirmatn font applied.",
buttonTooltip: "Enhance readability with Vazirmatn font",
};
if (document.getElementById(config.buttonID)) {
console.log(
"Custom Font: " + config.buttonID + " button already exists.\n bye bye()"
);
// console.log("Custom Font: bye bye()");
return;
}
// Apply custom font to selected elements
function applyCustomFont(selector, fontFamily) {
const style = document.createElement("style");
style.textContent = `${selector} * {font-family: ${fontFamily} !important;}`;
document.head.appendChild(style);
}
// Show notification with fade effect
function showNotification(message, duration) {
const notification = document.createElement("div");
Object.assign(notification.style, {
position: "fixed",
bottom: "80%",
left: "50%",
transform: "translateX(-50%)",
padding: "10px 20px",
backgroundColor: "rgba(0, 123, 255, 0.8)",
color: "yellow",
borderRadius: "5px",
boxShadow: "0 2px 5px rgba(0,0,0,0.2)",
zIndex: "10000",
opacity: "0",
transition: "opacity 0.5s ease",
textAlign: "center",
});
notification.textContent = message;
document.body.appendChild(notification);
requestAnimationFrame(() => {
notification.style.opacity = "1";
});
setTimeout(() => {
notification.style.opacity = "0";
notification.addEventListener(
"transitionend",
() => notification.remove(),
{ once: true }
);
}, duration);
}
// Create and add font change button
function addFontChangeButton() {
const button = document.createElement("button");
button.id = config.buttonID;
button.textContent = config.buttonText;
button.title = config.buttonTooltip;
const buttonStyle = {
position: "fixed",
top: "10px",
left: "3px",
zIndex: "9999",
width: "20px",
height: "20px",
borderRadius: "50%",
backgroundColor: "rgba(123, 110, 242, 0.3)",
color: "#FFFFFF",
border: "none",
fontWeight: "bold",
fontFamily: "Arial",
cursor: "pointer",
boxShadow: "0 2px 5px rgba(0,0,0,0.3)",
transition: "background-color 0.3s ease, opacity 0.3s ease",
};
Object.assign(button.style, buttonStyle);
function setButtonHoverState(isHover) {
if (!button.disabled) {
button.style.backgroundColor = isHover
? "rgba(123, 110, 242, 0.8)"
: "rgba(123, 110, 242, 0.3)";
}
}
button.addEventListener("mouseenter", () => setButtonHoverState(true));
button.addEventListener("mousemove", () => setButtonHoverState(true));
button.addEventListener("mouseover", () => setButtonHoverState(true));
button.addEventListener("mouseleave", () => setButtonHoverState(false));
button.addEventListener("click", () => {
button.disabled = true;
button.style.cursor = "default";
button.style.backgroundColor = "rgba(123, 110, 242, 0.3)";
applyCustomFont(config.selector, config.fontFamily);
showNotification(config.notificationMessage, config.notificationDuration);
button.style.opacity = "0";
setTimeout(() => {
button.disabled = false;
button.style.cursor = "pointer";
button.style.opacity = "1";
}, config.buttonFadeDuration);
});
document.body.appendChild(button);
function handleFullscreenChange() {
const isFullscreen = !!document.fullscreenElement;
button.style.opacity = isFullscreen ? "0" : "1";
button.style.pointerEvents = isFullscreen ? "none" : "auto";
}
document.addEventListener("fullscreenchange", handleFullscreenChange);
document.addEventListener("webkitfullscreenchange", handleFullscreenChange);
}
// Initialize the font change functionality
addFontChangeButton();
})();