Desktop: eww config refactor, mic volume widget

[kajusnau]

Description of Changes

1. Added Volume Mixer Widget in the Taskbar Quick Settings (currently disabled):

   • The volume mixer is accessible by clicking the "settings" icon next to the System Volume slider.
   • It dynamically displays currently active sink inputs (audio streams) or remains empty if no sink inputs are active.
   • Each sink input can be individually controlled, offering the same core functionality as the System Volume slider, including volume adjustment, mute, and unmute.
   • Each sink input will show the associated app icon if available. If not available, it will fallback to the default speaker icon.
   • Tested only with Google Chrome browser audio playback.

2. Added Microphone slider in the Taskbar Quick Settings:

   • Slider appears only when the default input device is in "RUNNING" state;
   • Slider has all the same functionality as the volume slider;
   • In addition to this slider, the button used to access the Quick Settings widget will also display a microphone icon when the default input device is in "RUNNING" state;

3. Added audio input and output device names to Quick Settings widget

4. Adjusted Desktop Widgets Styling

5. Refactored Eww Config For Easier Maintenance

Known Issues:

1. Volume mixer widget is currently disabled and not accessible due to missing backend functionality
2. Quick Settings widget may become slow to open/close when microphone is in use

Checklist for things done

• Summary of the proposed changes in the PR description
• More detailed description in the commit message(s)
• Commits are squashed into relevant entities - avoid a lot of minimal dev time commits in the PR
• Contribution guidelines followed
• Ghaf documentation updated with the commit - https://tiiuae.github.io/ghaf/
• PR linked to architecture documentation and requirement(s) (ticket id)
• Test procedure described (or includes tests). Select one or more:
  • Tested on Lenovo X1 x86_64
  • Tested on Jetson Orin NX or AGX aarch64
  • Tested on Polarfire riscv64
• Author has run make-checks and it passes
• All automatic Github Action checks pass - see actions
• Author has added reviewers and removed PR draft status
• Change requires full re-installation
• Change can be updated with nixos-rebuild ... switch

Instructions for Testing

• List all targets that this applies to:
• Is this a new feature
  • List the test steps to verify:
    • Volume mixer functionality cannot and should not be tested, please focus on changes 2-6
    • Verify Volume and Microphone sliders work as intended and display the correct device name, depending on which one is in use
• If it is an improvement how does it impact existing functionality?

[milva-unikie]

Tested this quickly on Lenovo-X1. Overall I think it looks great!

A few notes:

• If GhafAudioControl is "hidden" by default, there should be a way for the user to control speakers and microphones in the volume mixer.
• I agree that the amount of audio streams should be limited to one per vm before this volume mixer is taken into use. Now there is too many streams and no way for the user to know what controls what.
• Scrolling the streams is quite awkward. Limiting the amount of streams might fix this.
• All audio streams (Chrome browser, Slack, Teams, Zoom) are shown under the name of Google Chrome. As mentioned in Known issues this will be changed to be the name of the vm.

[kajusnau]

20.12 Update:
Changed to use GhafAudioControl dbus service to fetch info about audio streams.
Known bugs:

• Audio streams are not removed when closed (GhafAudioControl bug)

[milva-unikie]

Tested again with Lenovo-X1

• Speaker name is not shown for Bluetooth speaker.
• Microphone name is shown as Built-in Microphone for Bluetooth microphone.
• Charging icon is not shown when the laptop is charging. Instead the normal battery icon is shown. Quick settings menu still says "Charging".
• Quick settings menu was sometimes very slow to open when microphone was active. I could not exactly figure out when this was happening, because other times it worked with no issue.

[milva-unikie]

Tested on Lenovo-X1 (nixos-rebuild switch)

Still a few issues I found, sorry.

Issues:

• USB and Bluetooth microphones are shown as "Built-in microphone".
• Microphone icon and microphone slider do not appear when USB microphone or Bluetooth microphone is activated.
• The microphone is shown as active in taskbar if USB or Bluetooth headset is connected when logging in. If they are connected while logged in they are shown as active only when in use.
  • For USB headset the name of the microphone is empty in that case and for Bluetooth headset both speaker and microphone names are empty.
  • I confirmed this with two different USB headsets and two different Bluetooth headsets. The names are shown correctly in Audio Control for all of them.

Working:

• Sliders work.
• Charging icon works.
• Integrated speaker/microphone and 3,5 mm headsets work with no issues.
• Test-automation passes.

[milva-unikie]

All the issues have been fixed!

[vunnyso]

@kajusnau please rebase and remove WIP from title.

[ktusawrk]

Failed ghaf-pre-merge-pipeline build 301 is not related to this PR. There was a glitch in the pre-merge-pipeline itself. This failed build does not prevent merging this PR.