youtube-music/plugins/touchbar/back.ts

import { TouchBar, NativeImage, BrowserWindow } from 'electron';

import registerCallback from '../../providers/song-info';
import getSongControls from '../../providers/song-controls';

const {
  TouchBarButton,
  TouchBarLabel,
  TouchBarSpacer,
  TouchBarSegmentedControl,
  TouchBarScrubber,
} = TouchBar;

// Songtitle label
const songTitle = new TouchBarLabel({
  label: '',
});
// This will store the song controls once available
let controls: (() => void)[] = [];

// This will store the song image once available
const songImage: {
  icon?: NativeImage;
} = {};

// Pause/play button
const pausePlayButton = new TouchBarButton({});

// The song control buttons (control functions are in the same order)
const buttons = new TouchBarSegmentedControl({
  mode: 'buttons',
  segments: [
    new TouchBarButton({
      label: '⏮',
    }),
    pausePlayButton,
    new TouchBarButton({
      label: '⏭',
    }),
    new TouchBarButton({
      label: '👎',
    }),
    new TouchBarButton({
      label: '👍',
    }),
  ],
  change: (i) => controls[i](),
});

// This is the touchbar object, this combines everything with proper layout
const touchBar = new TouchBar({
  items: [
    new TouchBarScrubber({
      items: [songImage, songTitle],
      continuous: false,
    }),
    new TouchBarSpacer({
      size: 'flexible',
    }),
    buttons,
  ],
});

module.exports = (win: BrowserWindow) => {
  const { playPause, next, previous, dislike, like } = getSongControls(win);

  // If the page is ready, register the callback
  win.once('ready-to-show', () => {
    controls = [previous, playPause, next, dislike, like];

    // Register the callback
    registerCallback((songInfo) => {
      // Song information changed, so lets update the touchBar

      // Set the song title
      songTitle.label = songInfo.title;

      // Changes the pause button if paused
      pausePlayButton.label = songInfo.isPaused ? '▶️' : '⏸';

      // Get image source
      songImage.icon = songInfo.image
        ? songInfo.image.resize({ height: 23 })
        : undefined;

      win.setTouchBar(touchBar);
    });
  });
};