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extension.js

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+import Gio from 'gi://Gio';
+import GLib from 'gi://GLib';
+import GObject from 'gi://GObject';
+import {Extension} from 'resource:///org/gnome/shell/extensions/extension.js';
+
+import * as Main from 'resource:///org/gnome/shell/ui/main.js';
+import * as QuickSettings from 'resource:///org/gnome/shell/ui/quickSettings.js';
+
+
+const TemperatureItem = GObject.registerClass(
+class TemperatureItem extends QuickSettings.QuickSlider {
+    _init() {
+        super._init({
+            iconName: 'weather-clear-night',
+        });
+
+	this.minimum = 1500;
+        this.maximum = 6500;
+
+	this._settings = new Gio.Settings({schema_id: "org.gnome.settings-daemon.plugins.color"});
+
+        this.slider.accessible_name = _('NightLightTemperature');
+
+        this.slider.value = (this._settings.get_uint('night-light-temperature') - this.minimum) / (this.maximum - this.minimum);
+
+    	this._sliderChangedId = this.slider.connect('notify::value',
+	this._sliderChanged.bind(this));
+
+    }
+
+    _changeSlider(value) {
+        this.slider.block_signal_handler(this._sliderChangedId);
+        this.slider.value = value;
+        this.slider.unblock_signal_handler(this._sliderChangedId);
+    }
+
+
+    _sliderChanged() {
+        this._settings.set_uint('night-light-temperature', this.slider.value * (this.maximum - this.minimum) + this.minimum);
+    }
+
+
+});
+
+export const ExampleIndicator = GObject.registerClass(
+class ExampleIndicator extends QuickSettings.SystemIndicator {
+    _init() {
+        super._init();
+
+        this.quickSettingsItems.push(new TemperatureItem());
+    }
+});
+
+
+export default class SimpleNightLightSlider extends Extension {
+    enable() {
+        this._indicator = new ExampleIndicator(this);
+        Main.panel.statusArea.quickSettings.addExternalIndicator(this._indicator, 2);
+    }
+
+    disable() {
+        this._indicator.quickSettingsItems.forEach(item => item.destroy());
+        this._indicator.destroy();
+        this._indicator = null;
+    }
+
+}

metadata.json

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+{
+  "name": "Simple Night Light Slider",
+  "description": "Change Night Light",
+  "uuid": "[email protected]",
+  "shell-version": [
+    "45"
+  ],
+  "version": 1
+}