feat: keep clock ticking on server drops

apps/client/src/common/hooks/useAutoTickingClock.ts

@@ -0,0 +1,33 @@
+import { useEffect, useRef, useState } from 'react';
+
+import { useRuntimeStore } from '../stores/runtime';
+
+const takeOverTimeMs = 1500;
+
+/**
+ * Keeps the clock value ticking if the server drops updates
+ */
+export function useAutoTickingClock(): number {
+  const clock = useRuntimeStore((state) => state.clock);
+
+  const baselineRef = useRef({ clock, time: performance.now() });
+  const [, setTick] = useState(0);
+
+  // Update baseline when server clock changes
+  useEffect(() => {
+    baselineRef.current = { clock, time: performance.now() };
+  }, [clock]);
+
+  // Force periodic re-renders
+  useEffect(() => {
+    const id = setInterval(() => setTick((t) => t + 1), 1000);
+    return () => clearInterval(id);
+  }, []);
+
+  // Always derive from baseline + elapsed at render time
+  const elapsed = performance.now() - baselineRef.current.time;
+  if (elapsed < takeOverTimeMs) {
+    return clock;
+  }
+  return baselineRef.current.clock + Math.round(elapsed);
+}

apps/client/src/common/hooks/useSocket.ts

@@ -143,8 +143,6 @@ export const useTimer = createSelector((state: RuntimeStore) => ({
   ...state.timer,
 }));
 
-export const useClock = createSelector((state: RuntimeStore) => state.clock);
-
 export const useNextFlag = createSelector((state: RuntimeStore) => ({
   id: state.eventFlag?.id ?? null,
   expectedStart: state.offset.expectedFlagStart,

apps/client/src/features/overview/composite/TimeElements.tsx

@@ -13,8 +13,8 @@ import {
 
 import Tooltip from '../../../common/components/tooltip/Tooltip';
 import { useEntry } from '../../../common/hooks-query/useRundown';
+import { useAutoTickingClock } from '../../../common/hooks/useAutoTickingClock';
 import {
-  useClock,
   useCurrentGroupId,
   useFlagTimerOverView,
   useGroupTimerOverView,
@@ -342,7 +342,7 @@ export function OffsetOverview() {
 }
 
 export function ClockOverview({ shouldFormat, className }: OverviewTimeElementsProps & { className?: string }) {
-  const clock = useClock();
+  const clock = useAutoTickingClock();
   const formattedClock = shouldFormat ? formatTime(clock) : millisToString(clock);
 
   return (

apps/client/src/views/backstage/Backstage.tsx

@@ -10,7 +10,8 @@ import EmptyPage from '../../common/components/state/EmptyPage';
 import TitleCard from '../../common/components/title-card/TitleCard';
 import ViewLogo from '../../common/components/view-logo/ViewLogo';
 import ViewParamsEditor from '../../common/components/view-params-editor/ViewParamsEditor';
-import { useBackstageSocket, useClock } from '../../common/hooks/useSocket';
+import { useAutoTickingClock } from '../../common/hooks/useAutoTickingClock';
+import { useBackstageSocket } from '../../common/hooks/useSocket';
 import { useWindowTitle } from '../../common/hooks/useWindowTitle';
 import { cx, timerPlaceholderMin } from '../../common/utils/styleUtils';
 import { formatTime, getDefaultFormat } from '../../common/utils/time';
@@ -214,7 +215,7 @@ function ExtraInfo({ projectData, size, source }: ExtraInfoProps) {
 
 function BackstageClock() {
   const { getLocalizedString } = useTranslation();
-  const clock = useClock();
+  const clock = useAutoTickingClock();
 
   // gather timer data
   const formattedClock = formatTime(clock);

apps/client/src/views/countdown/Countdown.tsx

@@ -7,7 +7,7 @@ import Empty from '../../common/components/state/Empty';
 import EmptyPage from '../../common/components/state/EmptyPage';
 import ViewLogo from '../../common/components/view-logo/ViewLogo';
 import ViewParamsEditor from '../../common/components/view-params-editor/ViewParamsEditor';
-import { useClock } from '../../common/hooks/useSocket';
+import { useAutoTickingClock } from '../../common/hooks/useAutoTickingClock';
 import { useWindowTitle } from '../../common/hooks/useWindowTitle';
 import { ExtendedEntry } from '../../common/utils/rundownMetadata';
 import { formatTime, getDefaultFormat } from '../../common/utils/time';
@@ -140,7 +140,7 @@ function CountdownContents({ playableEvents, subscriptions, goToEditMode }: Coun
 
 function CountdownClock() {
   const { getLocalizedString } = useTranslation();
-  const clock = useClock();
+  const clock = useAutoTickingClock();
 
   // gather timer data
   const formattedClock = formatTime(clock);

apps/client/src/views/studio/StudioClock.tsx

@@ -1,5 +1,6 @@
 import { Playback } from 'ontime-types';
 
+import { useAutoTickingClock } from '../../common/hooks/useAutoTickingClock';
 import { useIsSmallScreen } from '../../common/hooks/useIsSmallScreen';
 import { useStudioClockSocket } from '../../common/hooks/useSocket';
 import { cx } from '../../common/utils/styleUtils';
@@ -18,7 +19,8 @@ interface StudioClockProps {
 
 export default function StudioClock({ hideCards }: StudioClockProps) {
   const isSmallScreen = useIsSmallScreen();
-  const { clock, playback } = useStudioClockSocket();
+  const clock = useAutoTickingClock();
+  const { playback } = useStudioClockSocket();
   const onAir = playback !== Playback.Stop;
 
   // if we are on mobile and have to show the cards

apps/client/src/views/timeline/TimelinePage.tsx

@@ -4,7 +4,8 @@ import { useMemo } from 'react';
 import EmptyPage from '../../common/components/state/EmptyPage';
 import ViewLogo from '../../common/components/view-logo/ViewLogo';
 import ViewParamsEditor from '../../common/components/view-params-editor/ViewParamsEditor';
-import { useClock, useSelectedEventId } from '../../common/hooks/useSocket';
+import { useAutoTickingClock } from '../../common/hooks/useAutoTickingClock';
+import { useSelectedEventId } from '../../common/hooks/useSocket';
 import { useWindowTitle } from '../../common/hooks/useWindowTitle';
 import { formatTime, getDefaultFormat } from '../../common/utils/time';
 import { useTranslation } from '../../translation/TranslationProvider';
@@ -72,7 +73,7 @@ function TimelinePage({ events, customFields, projectData, settings }: TimelineD
 
 function TimelineClock() {
   const { getLocalizedString } = useTranslation();
-  const clock = useClock();
+  const clock = useAutoTickingClock();
 
   // gather timer data
   const formattedClock = formatTime(clock);

apps/client/src/views/timer/Timer.tsx

@@ -7,6 +7,7 @@ import EmptyPage from '../../common/components/state/EmptyPage';
 import TitleCard from '../../common/components/title-card/TitleCard';
 import ViewLogo from '../../common/components/view-logo/ViewLogo';
 import ViewParamsEditor from '../../common/components/view-params-editor/ViewParamsEditor';
+import { useAutoTickingClock } from '../../common/hooks/useAutoTickingClock';
 import { useTimerSocket } from '../../common/hooks/useSocket';
 import { useWindowTitle } from '../../common/hooks/useWindowTitle';
 import { cx } from '../../common/utils/styleUtils';
@@ -101,7 +102,6 @@ function Timer({ customFields, projectData, isMirrored, settings, viewSettings,
 
   // gather timer data
   const totalTime = getTotalTime(time.duration, time.addedTime);
-  const formattedClock = formatTime(clock);
   const stageTimer = getTimerByType(freezeOvertime, timerTypeNow, clock, time, timerType);
   const display = getFormattedTimer(stageTimer, viewTimerType, localisedMinutes, {
     removeSeconds: hideTimerSeconds,
@@ -164,12 +164,7 @@ function Timer({ customFields, projectData, isMirrored, settings, viewSettings,
         </div>
       )}
 
-      {showClock && (
-        <div className='clock-container'>
-          <div className='label'>{getLocalizedString('common.time_now')}</div>
-          <SuperscriptTime time={formattedClock} className='clock' />
-        </div>
-      )}
+      {showClock && <TimerAutoTickingClock />}
 
       <div className={cx(['timer-container', message.timer.blink && !showOverlay && 'blink'])}>
         {showEndMessage ? (
@@ -216,3 +211,16 @@ function Timer({ customFields, projectData, isMirrored, settings, viewSettings,
     </div>
   );
 }
+
+function TimerAutoTickingClock() {
+  const autoTickingClock = useAutoTickingClock();
+  const formattedClock = formatTime(autoTickingClock);
+  const { getLocalizedString } = useTranslation();
+
+  return (
+    <div className='clock-container'>
+      <div className='label'>{getLocalizedString('common.time_now')}</div>
+      <SuperscriptTime time={formattedClock} className='clock' />
+    </div>
+  );
+}