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skel/.local/share/gnome-shell/extensions/volume_scroll@qord.si/extension.js

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+const Main = imports.ui.main;
+const Clutter = imports.gi.Clutter;
+const Volume = imports.ui.status.volume;
+const Gio = imports.gi.Gio;
+
+const VOL_ICONS = [
+    'audio-volume-muted-symbolic',
+    'audio-volume-low-symbolic',
+    'audio-volume-medium-symbolic',
+    'audio-volume-high-symbolic'
+];
+
+let panel,
+    panelBinding,
+    volumeControl,
+    volumeStep;
+
+function init() {
+  volumeControl = Volume.getMixerControl();
+  volumeStep = 500;
+
+  panel = Main.panel;
+  panelBinding = null;
+}
+
+function enable() {
+  panel.reactive = true;
+  if (panelBinding) {
+    disable();
+  }
+  panelBinding = panel.actor.connect('scroll-event',_onScroll);
+}
+
+function disable() {
+  if (panelBinding) {
+    panel.actor.disconnect(panelBinding);
+    panelBinding = null;
+  }
+}
+
+/**
+ * Returns the max volume.
+ */
+function _getVolumeMax() {
+  return volumeControl.get_vol_max_norm();
+  //return volumeControl.get_vol_max_amplified();  // boost volume (150%)
+}
+
+/**
+ * Handles panel mouse scroll event.
+ */
+function _onScroll(actor, event) {
+  let volume = volumeControl.get_default_sink().volume;
+
+  switch(event.get_scroll_direction()) {
+    case Clutter.ScrollDirection.UP:
+      volume += volumeStep;
+      break;
+    case Clutter.ScrollDirection.DOWN:
+      volume -= volumeStep;
+      break;
+    default:
+      return Clutter.EVENT_PROPAGATE;
+  }
+
+  if (volume > _getVolumeMax()) {
+    volume = _getVolumeMax();
+  }
+  else if (volume < volumeStep) {
+    volume = 0;
+  }
+
+  volumeControl.get_default_sink().volume = volume;
+  volumeControl.get_default_sink().push_volume();
+
+  _showVolumeOsd(volume, volume/_getVolumeMax() * 100);
+
+  return Clutter.EVENT_STOP;
+}
+
+/**
+ * Shows the current volume on OSD.
+ *
+ * @see gsd-media-keys-manager.c
+ */
+function _showVolumeOsd (level, percent) {
+  let monitor = -1;
+  let n;
+
+  if (level === 0) {
+      n = 0;
+  } else {
+      n = parseInt(3 * percent / 100 + 1);
+      n = Math.max(1, n);
+      n = Math.min(3, n);
+  }
+
+  let icon = Gio.Icon.new_for_string(VOL_ICONS[n]);
+
+  Main.osdWindowManager.show(monitor, icon, null, percent);
+}