Function SpinnerAnimationRow

src/components/Spinner/SpinnerAnimationRow.tsx:81–231

({
  mode,
  reducedMotion,
  hasActiveTools,
  responseLengthRef,
  message,
  messageColor,
  shimmerColor,
  overrideColor,
  loadingStartTimeRef,
  totalPausedMsRef,
  pauseStartTimeRef,
  spinnerSuffix,
  verbose,
  columns,
  hasRunningTeammates,
  teammateTokens,
  foregroundedTeammate,
  leaderIsIdle = false,
  thinkingStatus,
  effortSuffix
}: SpinnerAnimationRowProps)

 * and tip/tree subtrees out of the hot animation path.
 */
export function SpinnerAnimationRow({
  mode,
  reducedMotion,
  hasActiveTools,
  responseLengthRef,
  message,
  messageColor,
  shimmerColor,
  overrideColor,
  loadingStartTimeRef,
  totalPausedMsRef,
  pauseStartTimeRef,
  spinnerSuffix,
  verbose,
  columns,
  hasRunningTeammates,
  teammateTokens,
  foregroundedTeammate,
  leaderIsIdle = false,
  thinkingStatus,
  effortSuffix
}: SpinnerAnimationRowProps): React.ReactNode {
  const [viewportRef, time] = useAnimationFrame(reducedMotion ? null : 50);

  // === Elapsed time (wall-clock, derived from refs each frame) ===
  const now = Date.now();
  const elapsedTimeMs = pauseStartTimeRef.current !== null ? pauseStartTimeRef.current - loadingStartTimeRef.current - totalPausedMsRef.current : now - loadingStartTimeRef.current - totalPausedMsRef.current;

  // Track wall-clock turn start for teammates. While a swarm is running the
  // leader's elapsedTimeMs may jump around (new API calls reset
  // loadingStartTimeRef; pauses freeze it), so we anchor to the earliest
  // derived start seen so far. When no teammates are running this just tracks
  // derivedStart every frame, effectively resetting for the next swarm.
  const derivedStart = now - elapsedTimeMs;
  const turnStartRef = useRef(derivedStart);
  if (!hasRunningTeammates || derivedStart < turnStartRef.current) {
    turnStartRef.current = derivedStart;
  }

  // === Animation derivations from `time` ===
  const currentResponseLength = responseLengthRef.current;

  // Suppress stall detection when leader is idle — responseLengthRef and
  // hasActiveTools both track leader state. When viewing an active teammate
  // while leader is idle, they'd otherwise flag a false stall after 3s.
  // Treating leaderIsIdle like hasActiveTools resets the stall timer.
  const {
    isStalled,
    stalledIntensity
  } = useStalledAnimation(time, currentResponseLength, hasActiveTools || leaderIsIdle, reducedMotion);
  const frame = reducedMotion ? 0 : Math.floor(time / 120);
  const glimmerSpeed = mode === 'requesting' ? 50 : 200;
  // message is stable within a turn; stringWidth is expensive enough (Bun native
  // call per code point) to memoize explicitly across the 50ms loop.
  const glimmerMessageWidth = useMemo(() => stringWidth(message), [message]);
  const cycleLength = glimmerMessageWidth + 20;
  const cyclePosition = Math.floor(time / glimmerSpeed);
  const glimmerIndex = reducedMotion ? -100 : isStalled ? -100 : mode === 'requesting' ? cyclePosition % cycleLength - 10 : glimmerMessageWidth + 10 - cyclePosition % cycleLength;