Feature: add loading indicator when ReconnectApp is running

src/CONST.ts

@@ -305,6 +305,9 @@ const CONST = {
     ANIMATED_HIGHLIGHT_END_DURATION: 2000,
     ANIMATED_TRANSITION: 300,
     ANIMATED_TRANSITION_FROM_VALUE: 100,
+    ANIMATED_PROGRESS_BAR_DELAY: 300,
+    ANIMATED_PROGRESS_BAR_OPACITY_DURATION: 300,
+    ANIMATED_PROGRESS_BAR_DURATION: 750,
     ANIMATION_IN_TIMING: 100,
     ANIMATION_DIRECTION: {
         IN: 'in',

src/components/LoadingBar.tsx

@@ -0,0 +1,85 @@
+import React, {useEffect} from 'react';
+import Animated, {cancelAnimation, Easing, runOnJS, useAnimatedStyle, useSharedValue, withDelay, withRepeat, withSequence, withTiming} from 'react-native-reanimated';
+import useThemeStyles from '@hooks/useThemeStyles';
+import CONST from '@src/CONST';
+
+type LoadingBarProps = {
+    // Whether or not to show the loading bar
+    shouldShow: boolean;
+};
+
+function LoadingBar({shouldShow}: LoadingBarProps) {
+    const left = useSharedValue(0);
+    const width = useSharedValue(0);
+    const opacity = useSharedValue(0);
+    const isVisible = useSharedValue(false);
+    const styles = useThemeStyles();
+
+    useEffect(() => {
+        if (shouldShow) {
+            // eslint-disable-next-line react-compiler/react-compiler
+            isVisible.value = true;
+            left.value = 0;
+            width.value = 0;
+            opacity.value = withTiming(1, {duration: CONST.ANIMATED_PROGRESS_BAR_OPACITY_DURATION});
+            left.value = withDelay(
+                CONST.ANIMATED_PROGRESS_BAR_DELAY,
+                withRepeat(
+                    withSequence(
+                        withTiming(0, {duration: 0}),
+                        withTiming(0, {duration: CONST.ANIMATED_PROGRESS_BAR_DURATION, easing: Easing.bezier(0.65, 0, 0.35, 1)}),
+                        withTiming(100, {duration: CONST.ANIMATED_PROGRESS_BAR_DURATION, easing: Easing.bezier(0.65, 0, 0.35, 1)}),
+                    ),
+                    -1,
+                    false,
+                ),
+            );
+
+            width.value = withDelay(
+                CONST.ANIMATED_PROGRESS_BAR_DELAY,
+                withRepeat(
+                    withSequence(
+                        withTiming(0, {duration: 0}),
+                        withTiming(100, {duration: CONST.ANIMATED_PROGRESS_BAR_DURATION, easing: Easing.bezier(0.65, 0, 0.35, 1)}),
+                        withTiming(0, {duration: CONST.ANIMATED_PROGRESS_BAR_DURATION, easing: Easing.bezier(0.65, 0, 0.35, 1)}),
+                    ),
+                    -1,
+                    false,
+                ),
+            );
+        } else if (isVisible.value) {
+            opacity.value = withTiming(0, {duration: CONST.ANIMATED_PROGRESS_BAR_OPACITY_DURATION}, () => {
+                runOnJS(() => {
+                    isVisible.value = false;
+                    cancelAnimation(left);
+                    cancelAnimation(width);
+                });
+            });
+        }
+        // we want to update only when shouldShow changes
+        // eslint-disable-next-line react-compiler/react-compiler, react-hooks/exhaustive-deps
+    }, [shouldShow]);
+
+    const animatedIndicatorStyle = useAnimatedStyle(() => {
+        return {
+            left: `${left.value}%`,
+            width: `${width.value}%`,
+        };
+    });
+
+    const animatedContainerStyle = useAnimatedStyle(() => {
+        return {
+            opacity: opacity.value,
+        };
+    });
+
+    return (
+        <Animated.View style={[styles.progressBarWrapper, animatedContainerStyle]}>
+            {isVisible.value ? <Animated.View style={[styles.progressBar, animatedIndicatorStyle]} /> : null}
+        </Animated.View>
+    );
+}
+
+LoadingBar.displayName = 'ProgressBar';
+
+export default LoadingBar;

src/pages/home/ReportScreen.tsx

@@ -10,6 +10,7 @@ import {useOnyx} from 'react-native-onyx';
 import Banner from '@components/Banner';
 import FullPageNotFoundView from '@components/BlockingViews/FullPageNotFoundView';
 import DragAndDropProvider from '@components/DragAndDrop/Provider';
+import LoadingBar from '@components/LoadingBar';
 import MoneyReportHeader from '@components/MoneyReportHeader';
 import MoneyRequestHeader from '@components/MoneyRequestHeader';
 import OfflineWithFeedback from '@components/OfflineWithFeedback';
@@ -129,6 +130,7 @@ function ReportScreen({route, currentReportID = '', navigation}: ReportScreenPro
     const [isLoadingApp] = useOnyx(ONYXKEYS.IS_LOADING_APP);
     const [workspaceTooltip] = useOnyx(ONYXKEYS.NVP_WORKSPACE_TOOLTIP);
     const wasLoadingApp = usePrevious(isLoadingApp);
+    const [isLoadingReportData] = useOnyx(ONYXKEYS.IS_LOADING_REPORT_DATA, {initialValue: true});
     const finishedLoadingApp = wasLoadingApp && !isLoadingApp;
     const isDeletedParentAction = ReportActionsUtils.isDeletedParentAction(parentReportAction);
     const prevIsDeletedParentAction = usePrevious(isDeletedParentAction);
@@ -753,6 +755,7 @@ function ReportScreen({route, currentReportID = '', navigation}: ReportScreenPro
                             needsOffscreenAlphaCompositing
                         >
                             {headerView}
+                            {shouldUseNarrowLayout && !!isLoadingReportData && <LoadingBar shouldShow={!!isLoadingReportData} />}
                             {!!report && ReportUtils.isTaskReport(report) && shouldUseNarrowLayout && ReportUtils.isOpenTaskReport(report, parentReportAction) && (
                                 <View style={[styles.borderBottom]}>
                                     <View style={[styles.appBG, styles.pl0]}>

src/pages/home/sidebar/SidebarScreen/BaseSidebarScreen.tsx

@@ -1,6 +1,7 @@
 import React, {useEffect} from 'react';
 import {View} from 'react-native';
 import {useOnyx} from 'react-native-onyx';
+import LoadingBar from '@components/LoadingBar';
 import ScreenWrapper from '@components/ScreenWrapper';
 import useActiveWorkspaceFromNavigationState from '@hooks/useActiveWorkspaceFromNavigationState';
 import useLocalize from '@hooks/useLocalize';
@@ -31,6 +32,8 @@ function BaseSidebarScreen() {
     const {shouldUseNarrowLayout} = useResponsiveLayout();
     const [activeWorkspace] = useOnyx(`${ONYXKEYS.COLLECTION.POLICY}${activeWorkspaceID ?? -1}`);
 
+    const [isLoadingReportData] = useOnyx(ONYXKEYS.IS_LOADING_REPORT_DATA, {initialValue: true});
+
     useEffect(() => {
         Performance.markStart(CONST.TIMING.SIDEBAR_LOADED);
         Timing.start(CONST.TIMING.SIDEBAR_LOADED);
@@ -62,6 +65,7 @@ function BaseSidebarScreen() {
                         activeWorkspaceID={activeWorkspaceID}
                         shouldDisplaySearch={shouldDisplaySearch}
                     />
+                    <LoadingBar shouldShow={isLoadingReportData ?? false} />
                     <View style={[styles.flex1]}>
                         <SidebarLinksData
                             onLinkClick={startTimer}

src/styles/index.ts

@@ -5300,6 +5300,20 @@ const styles = (theme: ThemeColors) =>
             left: 12,
         },
 
+        progressBarWrapper: {
+            height: 2,
+            width: '100%',
+            backgroundColor: theme.border,
+            borderRadius: 5,
+            overflow: 'hidden',
+        },
+
+        progressBar: {
+            height: '100%',
+            backgroundColor: theme.success,
+            width: '100%',
+        },
+
         qbdSetupLinkBox: {
             backgroundColor: theme.hoverComponentBG,
             borderRadius: variables.componentBorderRadiusMedium,