init

extension.js

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+import GLib from 'gi://GLib'
+import GObject from 'gi://GObject'
+import St from 'gi://St'
+import Clutter from 'gi://Clutter'
+
+import { Extension } from 'resource:///org/gnome/shell/extensions/extension.js'
+import * as PanelMenu from 'resource:///org/gnome/shell/ui/panelMenu.js'
+import * as Main from 'resource:///org/gnome/shell/ui/main.js'
+
+const Indicator = GObject.registerClass(
+    class Indicator extends PanelMenu.Button {
+        _init(textInPanel) {
+            super._init(0.0, "spinner", true)
+            this.add_child(textInPanel)
+        }
+    })
+
+export default class IndicatorExampleExtension extends Extension {
+    timeoutId = 0
+    enable() {
+        let textInPanel = new St.Label({
+            text: ":",
+            y_expand: true,
+            y_align: Clutter.ActorAlign.CENTER,
+        })
+        textInPanel.set_style("font-family: monospace")
+        if (this.timeoutId != 0) {
+            GLib.Source.remove(this.timeoutId)
+            this.timeoutId = 0
+        }
+        let index = 0
+        //const content = ['|', '/', '-', '\\']
+        //const content = ['⠻', '⠽', '⠾', '⠷', '⠯', '⠟']
+        const content = ['⢿', '⣻', '⣽', '⣾', '⣷', '⣯', '⣟', '⡿']
+        this.timeoutId = GLib.timeout_add(
+            GLib.PRIORITY_DEFAULT,
+            100,
+            () => {
+                textInPanel.text = content[index]
+                index ++
+                index %= content.length
+                return GLib.SOURCE_CONTINUE
+            }
+        )
+        this._indicator = new Indicator(textInPanel)
+        Main.panel.addToStatusArea(this.uuid, this._indicator, 255, "left")
+    }
+
+    disable() {
+        if (this.timeoutId != 0) {
+            GLib.Source.remove(this.timeoutId)
+            this.timeoutId = 0
+        }
+        this._indicator.destroy()
+        this._indicator = null
+    }
+}

metadata.json

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+{
+    "name": "Spinner",
+    "description": "A useless spinner",
+    "uuid": "spinner@isjerryxiao",
+    "shell-version": [
+        "45"
+    ],
+    "version": 1,
+    "url": "https://git.jerryxiao.com/Jerry/gnome-shell-extension-spinner"
+}