Refactor to reduce code length
This hopefully improves performance, big thanks to Daren Liang to helping with the refactor
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script.js
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script.js
@ -1,273 +1,65 @@
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// ==UserScript==
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// @name Spotify Background Changer
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// @name Spotify Rainbow Background
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// @namespace http://tampermonkey.net/
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// @source https://github.com/Glaceon575/SpotifyBackgroundSwitcher
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// @version 0.0.3
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// @version 0.1.0
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// @description Changes the background of Spotify playlists and albums in a rainbow pattern
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// @author Isaac Shoebottom
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// @updateURL https://raw.githubusercontent.com/Glaceon575/SpotifyBackgroundSwitcher/master/script.js
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// @downloadURL https://raw.githubusercontent.com/Glaceon575/SpotifyBackgroundSwitcher/master/script.js
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// @match https://open.spotify.com/*
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// @require https://ajax.googleapis.com/ajax/libs/jquery/3.6.0/jquery.min.js
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// @grant none
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// ==/UserScript==
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"use strict";
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waitForKeyElements(".xYgjMpAjE5XT05aRIezb", changeBackground);
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let background;
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const selector = ".gHImFiUWOg93pvTefeAD.xYgjMpAjE5XT05aRIezb";
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const timer = 50 //in milliseconds
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const timer = 33; //in milliseconds
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const probeTimer = 500 //in milliseconds, timer for checking for selector
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const difference = 60; //delta between the top and bottom
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let r1, g1, b1, r2, b2, g2
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let topIntensityCutoff = 235
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let topDarknessCutoff = 75
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probeBackground();
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const difference = 60 //delta between the top and bottom
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const start = {
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intensity: 235,
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darkness: 75,
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};
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let bottomIntensityCutoff = topIntensityCutoff - difference
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let bottomDarknessCutoff = topDarknessCutoff - difference
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// [r, g, b]
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const color = [start.intensity, start.darkness, start.darkness];
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let topIncreaseBlue = true;
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let topDecreaseRed = false;
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let topIncreaseGreen = false;
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let topDecreaseBlue = false;
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let topIncreaseRed = false;
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let topDecreaseGreen = false;
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let bottomIncreaseBlue = true;
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let bottomDecreaseRed = false;
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let bottomIncreaseGreen = false;
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let bottomDecreaseBlue = false;
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let bottomIncreaseRed = false;
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let bottomDecreaseGreen = false;
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function changeBackground() {
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const htmlCollection = document.getElementsByClassName("gHImFiUWOg93pvTefeAD xYgjMpAjE5XT05aRIezb");
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const bg = htmlCollection[0];
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r1 = topIntensityCutoff;
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g1 = topDarknessCutoff;
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b1 = topDarknessCutoff;
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r2 = bottomIntensityCutoff;
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g2 = bottomDarknessCutoff;
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b2 = bottomDarknessCutoff;
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setInterval(changeColor, timer, bg);
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}
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function changeColor(bg) {
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if (!document.hidden) {
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// Top Half
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//Part 1;
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if (topIncreaseBlue) {
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if (b1 === topIntensityCutoff) {
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topDecreaseRed = true;
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topIncreaseBlue = false;
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let isIncrease = true;
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let currentColor = 2;
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function changeColor() {
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if (color[currentColor] === (isIncrease ? start.intensity : start.darkness)) {
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isIncrease = !isIncrease;
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currentColor = (currentColor + 1) % 3;
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} else {
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b1++;
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}
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}
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//Part 2;
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else if (topDecreaseRed) {
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if (r1 === topDarknessCutoff) {
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topIncreaseGreen = true;
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topDecreaseRed = false;
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} else {
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r1--;
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}
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}
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//Part 3
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else if (topIncreaseGreen) {
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if (g1 === topIntensityCutoff) {
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topDecreaseBlue = true;
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topIncreaseGreen = false;
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} else {
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g1++;
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}
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}
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//Part 4
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else if (topDecreaseBlue) {
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if (b1 === topDarknessCutoff) {
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topIncreaseRed = true;
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topDecreaseBlue = false;
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} else {
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b1--;
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}
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}
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//Part 5
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else if (topIncreaseRed) {
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if (r1 === topIntensityCutoff) {
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topDecreaseGreen = true;
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topIncreaseRed = false;
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} else {
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r1++;
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}
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}
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//Part 6
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else if (topDecreaseGreen) {
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if (g1 === topDarknessCutoff) {
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topIncreaseBlue = true;
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topDecreaseGreen = false;
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} else {
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g1--;
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}
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color[currentColor] += isIncrease ? 1 : -1;
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}
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// Bottom Half
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//Part 1;
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if (bottomIncreaseBlue) {
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if (b2 === bottomIntensityCutoff) {
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bottomDecreaseRed = true;
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bottomIncreaseBlue = false;
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} else {
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b2++;
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}
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}
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//Part 2;
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else if (bottomDecreaseRed) {
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if (r2 === bottomDarknessCutoff) {
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bottomIncreaseGreen = true;
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bottomDecreaseRed = false;
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} else {
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r2--;
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}
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}
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//Part 3
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else if (bottomIncreaseGreen) {
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if (g2 === bottomIntensityCutoff) {
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bottomDecreaseBlue = true;
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bottomIncreaseGreen = false;
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} else {
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g2++;
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}
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}
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//Part 4
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else if (bottomDecreaseBlue) {
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if (b2 === bottomDarknessCutoff) {
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bottomIncreaseRed = true;
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bottomDecreaseBlue = false;
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} else {
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b2--;
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}
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}
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//Part 5
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else if (bottomIncreaseRed) {
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if (r2 === bottomIntensityCutoff) {
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bottomDecreaseGreen = true;
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bottomIncreaseRed = false;
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} else {
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r2++;
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}
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}
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//Part 6
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else if (bottomDecreaseGreen) {
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if (g2 === bottomDarknessCutoff) {
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bottomIncreaseBlue = true;
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bottomDecreaseGreen = false;
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} else {
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g2--;
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}
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}
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bg.style.background = "linear-gradient(rgb(" + r1 + ", " + g1 + ", " + b1 + "),rgba(" + r2 + ", " + g2 + ", " + b2 + ", 0.5)),var(--background-noise)";
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}
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background.style.background = `linear-gradient(rgb(${color.join(",")}),rgba(${color.map(c => c - difference).join(",")}, 0.5)),var(--background-noise)`;
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}
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//waitForKeyElements
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/*--- waitForKeyElements(): A utility function, for Greasemonkey scripts,
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that detects and handles AJAXed content.
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Usage example:
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waitForKeyElements (
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"div.comments"
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, commentCallbackFunction
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);
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//--- Page-specific function to do what we want when the node is found.
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function commentCallbackFunction (jNode) {
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jNode.text ("This comment changed by waitForKeyElements().");
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function probeBackground() {
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console.log("probing background");
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const interval = setInterval(() => {
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const newBackground = document.querySelector(selector);
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if (!newBackground) {
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return;
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}
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IMPORTANT: This function requires your script to have loaded jQuery.
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*/
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function waitForKeyElements(
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selectorTxt, /* Required: The jQuery selector string that
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specifies the desired element(s). */
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actionFunction, /* Required: The code to run when elements are found. It is passed a jNode to the matched
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element. */
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bWaitOnce, /* Optional: If false, will continue to scan for new elements even after the first match is
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found. */
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iframeSelector /* Optional: If set, identifies the iframe to search. */
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) {
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let targetNodes, bTargetsFound;
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if (typeof iframeSelector == "undefined")
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targetNodes = $(selectorTxt);
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else
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targetNodes = $(iframeSelector).contents()
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.find(selectorTxt);
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if (targetNodes && targetNodes.length > 0) {
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bTargetsFound = true;
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/*--- Found target node(s). Go through each and act if they are new. */
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targetNodes.each(function () {
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const jThis = $(this);
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const alreadyFound = jThis.data('alreadyFound') || false;
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if (!alreadyFound) {
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//--- Call the payload function.
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const cancelFound = actionFunction(jThis);
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if (cancelFound)
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bTargetsFound = false;
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else
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jThis.data('alreadyFound', true);
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if (!background) {
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background = newBackground;
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}
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});
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} else {
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bTargetsFound = false;
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if (!newBackground.isSameNode(background)) {
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background = newBackground;
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clearInterval(interval);
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probeBackground();
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}
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//--- Get the timer-control variable for this selector.
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const controlObj = waitForKeyElements.controlObj || {};
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const controlKey = selectorTxt.replace(/\W/g, "_");
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let timeControl = controlObj [controlKey];
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//--- Now set or clear the timer as appropriate.
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if (bTargetsFound && bWaitOnce && timeControl) {
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//--- The only condition where we need to clear the timer.
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clearInterval(timeControl);
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delete controlObj [controlKey]
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} else {
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//--- Set a timer, if needed.
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if (!timeControl) {
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timeControl = setInterval(function () {
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waitForKeyElements(selectorTxt,
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actionFunction,
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bWaitOnce,
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iframeSelector
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);
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},
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300
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);
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controlObj [controlKey] = timeControl;
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}
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}
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waitForKeyElements.controlObj = controlObj;
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changeColor();
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}, probeTimer);
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}
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