feat: add player subtitles delay shortcuts

src/common/animations.less

@@ -82,6 +82,19 @@
     transform: translateY(100%);
 }
 
+.fade-enter {
+    opacity: 0;
+}
+
+.fade-active {
+    opacity: 1;
+    transition: opacity 0.3s cubic-bezier(0.32, 0, 0.67, 0);
+}
+
+.fade-exit {
+    opacity: 0;
+}
+
 @keyframes fade-in-no-motion {
     0% {
         opacity: 0;

src/routes/Player/Indicator/Indicator.less

@@ -0,0 +1,23 @@
+.indicator-container {
+    position: absolute;
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    height: 4rem;
+    user-select: none;
+
+    .indicator {
+        flex: none;
+        position: relative;
+        display: flex;
+        align-items: center;
+        justify-content: center;
+        height: 100%;
+        padding: 0 2rem;
+        border-radius: 4rem;
+        text-align: center;
+        font-weight: bold;
+        color: var(--primary-foreground-color);
+        background-color: var(--modal-background-color);
+    }
+}

src/routes/Player/Indicator/Indicator.tsx

@@ -0,0 +1,73 @@
+import React, { useEffect, useMemo, useRef, useState } from 'react';
+import classNames from 'classnames';
+import { t } from 'i18next';
+import { Transition } from 'stremio/components';
+import { useBinaryState } from 'stremio/common';
+import styles from './Indicator.less';
+
+type Property = {
+    label: string,
+    format: (value: number) => string,
+};
+
+const PROPERTIES: Record<string, Property> = {
+    'extraSubtitlesDelay': {
+        label: 'SUBTITLES_DELAY',
+        format: (value) => `${(value / 1000).toFixed(2)}s`,
+    },
+};
+
+type VideoState = Record<string, number>;
+
+type Props = {
+    className: string,
+    videoState: VideoState,
+};
+
+const Indicator = ({ className, videoState }: Props) => {
+    const timeout = useRef<NodeJS.Timeout | null>(null);
+    const prevVideoState = useRef<VideoState>(videoState);
+
+    const [shown, show, hide] = useBinaryState(false);
+    const [current, setCurrent] = useState<string | null>(null);
+
+    const label = useMemo(() => {
+        const property = current && PROPERTIES[current];
+        return property && t(property.label);
+    }, [current]);
+
+    const value = useMemo(() => {
+        const property = current && PROPERTIES[current];
+        const value = current && videoState[current];
+        return property && value && property.format(value);
+    }, [current, videoState]);
+
+    useEffect(() => {
+        for (const property of Object.keys(PROPERTIES)) {
+            const prev = prevVideoState.current[property];
+            const next = videoState[property];
+
+            if (next && next !== prev) {
+                setCurrent(property);
+                show();
+
+                timeout.current && clearTimeout(timeout.current);
+                timeout.current = setTimeout(hide, 1000);
+            }
+        }
+
+        prevVideoState.current = videoState;
+    }, [videoState]);
+
+    return (
+        <Transition when={shown} name={'fade'}>
+            <div className={classNames(className, styles['indicator-container'])}>
+                <div className={styles['indicator']}>
+                    <div>{label} {value}</div>
+                </div>
+            </div>
+        </Transition>
+    );
+};
+
+export default Indicator;

src/routes/Player/Player.js

@@ -27,6 +27,7 @@ const useStatistics = require('./useStatistics');
 const useVideo = require('./useVideo');
 const styles = require('./styles');
 const Video = require('./Video');
+const { default: Indicator } = require('./Indicator/Indicator');
 
 const Player = ({ urlParams, queryParams }) => {
     const { t } = useTranslation();
@@ -216,6 +217,16 @@ const Player = ({ urlParams, queryParams }) => {
         video.setProp('extraSubtitlesDelay', delay);
     }, []);
 
+    const onIncreaseSubtitlesDelay = React.useCallback(() => {
+        const delay = video.state.extraSubtitlesDelay + 250;
+        onExtraSubtitlesDelayChanged(delay);
+    }, [video.state.extraSubtitlesDelay, onExtraSubtitlesDelayChanged]);
+
+    const onDecreaseSubtitlesDelay = React.useCallback(() => {
+        const delay = video.state.extraSubtitlesDelay - 250;
+        onExtraSubtitlesDelayChanged(delay);
+    }, [video.state.extraSubtitlesDelay, onExtraSubtitlesDelayChanged]);
+
     const onSubtitlesSizeChanged = React.useCallback((size) => {
         updateSettings({ subtitlesSize: size });
     }, [updateSettings]);
@@ -587,6 +598,14 @@ const Player = ({ urlParams, queryParams }) => {
 
                     break;
                 }
+                case 'KeyG': {
+                    onDecreaseSubtitlesDelay();
+                    break;
+                }
+                case 'KeyH': {
+                    onIncreaseSubtitlesDelay();
+                    break;
+                }
                 case 'Escape': {
                     closeMenus();
                     !settings.escExitFullscreen && window.history.back();
@@ -620,7 +639,29 @@ const Player = ({ urlParams, queryParams }) => {
             window.removeEventListener('keyup', onKeyUp);
             window.removeEventListener('wheel', onWheel);
         };
-    }, [player.metaItem, player.selected, streamingServer.statistics, settings.seekTimeDuration, settings.seekShortTimeDuration, settings.escExitFullscreen, routeFocused, menusOpen, nextVideoPopupOpen, video.state.paused, video.state.time, video.state.volume, video.state.audioTracks, video.state.subtitlesTracks, video.state.extraSubtitlesTracks, video.state.playbackSpeed, toggleSubtitlesMenu, toggleStatisticsMenu, toggleSideDrawer]);
+    }, [
+        player.metaItem,
+        player.selected,
+        streamingServer.statistics,
+        settings.seekTimeDuration,
+        settings.seekShortTimeDuration,
+        settings.escExitFullscreen,
+        routeFocused,
+        menusOpen,
+        nextVideoPopupOpen,
+        video.state.paused,
+        video.state.time,
+        video.state.volume,
+        video.state.audioTracks,
+        video.state.subtitlesTracks,
+        video.state.extraSubtitlesTracks,
+        video.state.playbackSpeed,
+        toggleSubtitlesMenu,
+        toggleStatisticsMenu,
+        toggleSideDrawer,
+        onDecreaseSubtitlesDelay,
+        onIncreaseSubtitlesDelay,
+    ]);
 
     React.useEffect(() => {
         video.events.on('error', onError);
@@ -760,6 +801,10 @@ const Player = ({ urlParams, queryParams }) => {
                 onMouseOver={onBarMouseMove}
                 onTouchEnd={onContainerMouseLeave}
             />
+            <Indicator
+                className={classnames(styles['layer'], styles['indicator-layer'])}
+                videoState={video.state}
+            />
             {
                 nextVideoPopupOpen ?
                     <NextVideoPopup

src/routes/Player/styles.less

@@ -107,6 +107,13 @@ html:not(.active-slider-within) {
             }
         }
 
+        &.indicator-layer {
+            top: initial;
+            left: 0;
+            right: 0;
+            bottom: 10rem;
+        }
+
         &.menu-layer {
             top: initial;
             left: initial;

src/routes/Settings/Settings.js

@@ -709,6 +709,16 @@ const Settings = () => {
                                 <kbd>F</kbd>
                             </div>
                         </div>
+                        <div className={styles['option-container']}>
+                            <div className={styles['option-name-container']}>
+                                <div className={styles['label']}>{ t('SETTINGS_SHORTCUT_SUBTITLES_DELAY') }</div>
+                            </div>
+                            <div className={classnames(styles['option-input-container'], styles['shortcut-container'])}>
+                                <kbd>G</kbd>
+                                <div className={styles['label']}>and</div>
+                                <kbd>H</kbd>
+                            </div>
+                        </div>
                         <div className={styles['option-container']}>
                             <div className={styles['option-name-container']}>
                                 <div className={styles['label']}>{ t('SETTINGS_SHORTCUT_NAVIGATE_MENUS') }</div>