Create first version of picture in picture plugin

plugins/picture-in-picture/back.js

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+const path = require("path");
+
+const { app, ipcMain } = require("electron");
+
+const { injectCSS } = require("../utils");
+
+let isInPiPMode = false;
+let originalPosition;
+let originalSize;
+
+const pipPosition = [10, 10];
+const pipSize = [400, 220];
+
+const togglePiP = async (win) => {
+	isInPiPMode = !isInPiPMode;
+
+	if (isInPiPMode) {
+		injectCSS(win.webContents, path.join(__dirname, "style.css"));
+
+		originalPosition = win.getPosition();
+		originalSize = win.getSize();
+
+		win.setFullScreenable(false);
+		await win.webContents.executeJavaScript(
+			// Go fullscreen
+			`document.querySelector(".fullscreen-button").click()`
+		);
+
+		app.dock.hide();
+		win.setVisibleOnAllWorkspaces(true, {
+			visibleOnFullScreen: true,
+		});
+		app.dock.show();
+		win.setAlwaysOnTop(true, "screen-saver", 1);
+	} else {
+		win.setFullScreenable(true);
+		await win.webContents.executeJavaScript(
+			// Exit fullscreen
+			`document.querySelector(".exit-fullscreen-button").click()`
+		);
+
+		win.setVisibleOnAllWorkspaces(false);
+		win.setAlwaysOnTop(false);
+	}
+
+	const [x, y] = isInPiPMode ? pipPosition : originalPosition;
+	const [w, h] = isInPiPMode ? pipSize : originalSize;
+	win.setPosition(x, y);
+	win.setSize(w, h);
+
+	win.setWindowButtonVisibility(!isInPiPMode);
+};
+
+module.exports = (win) => {
+	ipcMain.on("picture-in-picture", async () => {
+		await togglePiP(win);
+	});
+};

plugins/picture-in-picture/front.js

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+const { ipcRenderer } = require("electron");
+
+const { getSongMenu } = require("../../providers/dom-elements");
+const { ElementFromFile, templatePath } = require("../utils");
+
+let menu = null;
+const pipButton = ElementFromFile(
+	templatePath(__dirname, "picture-in-picture.html")
+);
+
+const observer = new MutationObserver(() => {
+	if (!menu) {
+		menu = getSongMenu();
+		if (!menu) return;
+	}
+	if (menu.contains(pipButton)) return;
+	const menuUrl = document.querySelector(
+		'tp-yt-paper-listbox [tabindex="0"] #navigation-endpoint'
+	)?.href;
+	if (menuUrl && !menuUrl.includes("watch?")) return;
+
+	menu.prepend(pipButton);
+});
+
+global.togglePictureInPicture = () => {
+	ipcRenderer.send("picture-in-picture");
+};
+
+function observeMenu(options) {
+	document.addEventListener(
+		"apiLoaded",
+		() => {
+			observer.observe(document.querySelector("ytmusic-popup-container"), {
+				childList: true,
+				subtree: true,
+			});
+		},
+		{ once: true, passive: true }
+	);
+}
+
+module.exports = observeMenu;

plugins/picture-in-picture/style.css

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+/* Make entire window draggable */
+body {
+	-webkit-app-region: drag;
+}
+button {
+	-webkit-app-region: no-drag;
+}

plugins/picture-in-picture/templates/picture-in-picture.html

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+<div
+	class="style-scope menu-item ytmusic-menu-popup-renderer"
+	role="option"
+	tabindex="-1"
+	aria-disabled="false"
+	aria-selected="false"
+	onclick="togglePictureInPicture()"
+>
+	<div
+		id="navigation-endpoint"
+		class="yt-simple-endpoint style-scope ytmusic-menu-navigation-item-renderer"
+		tabindex="-1"
+	>
+		<div
+			class="icon menu-icon style-scope ytmusic-menu-navigation-item-renderer"
+		>
+			<svg
+				version="1.1"
+				id="Layer_1"
+				xmlns="http://www.w3.org/2000/svg"
+				xmlns:xlink="http://www.w3.org/1999/xlink"
+				x="0px"
+				y="0px"
+				viewBox="0 0 512 512"
+				style="enable-background: new 0 0 512 512"
+				xml:space="preserve"
+			>
+				<style type="text/css">
+					.st0 {
+						fill: #aaaaaa;
+					}
+				</style>
+				<g id="XMLID_6_">
+					<path
+						id="XMLID_11_"
+						class="st0"
+						d="M418.5,139.4H232.4v139.8h186.1V139.4z M464.8,46.7H46.3C20.5,46.7,0,68.1,0,93.1v325.9
+		c0,25.8,21.4,46.3,46.3,46.3h419.4c25.8,0,46.3-20.5,46.3-46.3V93.1C512,67.2,490.6,46.7,464.8,46.7z M464.8,418.9H46.3V92.2h419.4
+		v326.8H464.8z"
+					/>
+				</g>
+			</svg>
+		</div>
+		<div
+			class="text style-scope ytmusic-menu-navigation-item-renderer"
+			id="ytmcustom-pip"
+		>
+			Picture in picture
+		</div>
+	</div>
+</div>