nixos-configs/hosts/wim/config/ags/js/bar/audio.js

import { Audio, Widget } from '../../imports.js';
const { Label, Box, Icon } = Widget;

import Separator from '../misc/separator.js';
import EventBox  from '../misc/cursorbox.js';

const items = {
  101: 'audio-volume-overamplified-symbolic',
  67: 'audio-volume-high-symbolic',
  34: 'audio-volume-medium-symbolic',
  1: 'audio-volume-low-symbolic',
  0: 'audio-volume-muted-symbolic',
};


const SpeakerIndicator = props => Icon({
  ...props,
  icon: '',
  connections: [[Audio, self => {
    if (!Audio.speaker)
      return;

    if (Audio.speaker.stream.isMuted) {
      self.icon = items[0];
    }
    else {
      const vol = Audio.speaker.volume * 100;

      for (const threshold of [-1, 0, 33, 66, 100]) {
        if (vol > threshold + 1)
          self.icon = items[threshold + 1];
      }
    }
  }, 'speaker-changed']],
});

const SpeakerPercentLabel = props => Label({
  ...props,
  connections: [[Audio, label => {
    if (Audio.speaker)
      label.label = Math.round(Audio.speaker.volume * 100) + '%';
  }, 'speaker-changed']],
});

export default () => EventBox({
  onPrimaryClickRelease: 'pavucontrol',
  className: 'toggle-off',
  child: Box({
    className: 'audio',
    children: [
      SpeakerIndicator(),
      Separator(5),
      SpeakerPercentLabel(),
    ],
  }),
});