Function paintWaveProgress

static/mobile/app.js:185–194

()

// (≤ N times over the whole track), not every animation frame.
let _lastPlayedBar = -1;
function paintWaveProgress() {
  const bars = app.querySelectorAll(".wave-bars > i");
  if (!bars.length) return;
  const played = Math.round(state.progress * bars.length);
  if (played === _lastPlayedBar) return;
  for (let i = 0; i < bars.length; i++) {
    bars[i].style.background = i <= played ? "#f5b417" : "#34343c";
  }
  _lastPlayedBar = played;
}

function onEngineTime(t) {
  const dur = curDuration() || 1;