testing ags

home/core/gui/ags/services/brightness.js

@@ -0,0 +1,79 @@
+import { Service, Utils } from "../imports.js";
+import Gio from "gi://Gio";
+import GLib from "gi://GLib";
+
+const clamp = (num, min, max) => Math.min(Math.max(num, min), max);
+
+class BrightnessService extends Service {
+  static {
+    Service.register(
+      this,
+      { "screen-changed": ["float"] },
+      { "screen-value": ["float", "rw"] },
+    );
+  }
+
+  #screenValue = 0;
+
+  #interface = Utils.exec("sh -c 'ls -w1 /sys/class/backlight | head -1'");
+  #path = `/sys/class/backlight/${this.#interface}`;
+  #brightness = `${this.#path}/brightness`;
+
+  #max = Number(Utils.readFile(`${this.#path}/max_brightness`));
+
+  get screen_value() {
+    return this.#screenValue;
+  }
+
+  set screen_value(percent) {
+    percent = clamp(percent, 0, 1);
+    this.#screenValue = percent;
+
+    const file = Gio.File.new_for_path(this.#brightness);
+    const string = `${Math.round(percent * this.#max)}`;
+
+    new Promise((resolve, _) => {
+      file.replace_contents_bytes_async(
+        new GLib.Bytes(new TextEncoder().encode(string)),
+        null,
+        false,
+        Gio.FileCreateFlags.NONE,
+        null,
+        (self, res) => {
+          try {
+            self.replace_contents_finish(res);
+            resolve(self);
+          } catch (error) {
+            print(error);
+          }
+        },
+      );
+    });
+  }
+
+  constructor() {
+    super();
+
+    this.#updateScreenValue();
+    Utils.monitorFile(this.#brightness, () => this.#onChange());
+  }
+
+  #updateScreenValue() {
+    this.#screenValue = Number(Utils.readFile(this.#brightness)) / this.#max;
+  }
+
+  #onChange() {
+    this.#updateScreenValue();
+
+    this.notify("screen-value");
+    this.emit("screen-changed", this.#screenValue);
+  }
+
+  connectWidget(widget, callback, event = "screen-changed") {
+    super.connectWidget(widget, callback, event);
+  }
+}
+
+const service = new BrightnessService();
+
+export default service;