Implement pager and tabbar for desktop web

7 files changed, 222 insertions, 111 deletions

diff --git a/src/lib/styles.ts b/src/lib/styles.ts
index 5d7f7f82d..aa255b21f 100644
--- a/src/lib/styles.ts
+++ b/src/lib/styles.ts
@@ -70,6 +70,7 @@ export const s = StyleSheet.create({
   borderRight1: {borderRightWidth: 1},
   borderBottom1: {borderBottomWidth: 1},
   borderLeft1: {borderLeftWidth: 1},
+  hidden: {display: 'none'},
 
   // font weights
   fw600: {fontWeight: '600'},
diff --git a/src/view/com/util/TabBar.tsx b/src/view/com/util/TabBar.tsx
index dd8fdcb56..4b67b8a80 100644
--- a/src/view/com/util/TabBar.tsx
+++ b/src/view/com/util/TabBar.tsx
@@ -7,6 +7,7 @@ import {
 } from 'react-native'
 import {Text} from './text/Text'
 import {usePalette} from 'lib/hooks/usePalette'
+import {isDesktopWeb} from 'platform/detection'
 
 interface Layout {
   x: number
@@ -46,8 +47,9 @@ export function TabBar({
 
   const indicatorStyle = {
     backgroundColor: indicatorColor || pal.colors.link,
-    bottom: indicatorPosition === 'bottom' ? -1 : undefined,
-    top: indicatorPosition === 'top' ? -1 : undefined,
+    bottom:
+      indicatorPosition === 'bottom' ? (isDesktopWeb ? 0 : -1) : undefined,
+    top: indicatorPosition === 'top' ? (isDesktopWeb ? 0 : -1) : undefined,
     transform: [
       {
         translateX: panX.interpolate({
@@ -112,26 +114,49 @@ export function TabBar({
   )
 }
 
-const styles = StyleSheet.create({
-  outer: {
-    flexDirection: 'row',
-    paddingHorizontal: 14,
-  },
-  itemTop: {
-    paddingTop: 10,
-    paddingBottom: 10,
-    marginRight: 24,
-  },
-  itemBottom: {
-    paddingTop: 8,
-    paddingBottom: 12,
-    marginRight: 24,
-  },
-  indicator: {
-    position: 'absolute',
-    left: 0,
-    width: 1,
-    height: 3,
-    borderRadius: 4,
-  },
-})
+const styles = isDesktopWeb
+  ? StyleSheet.create({
+      outer: {
+        flexDirection: 'row',
+        paddingHorizontal: 18,
+      },
+      itemTop: {
+        paddingTop: 16,
+        paddingBottom: 14,
+        marginRight: 24,
+      },
+      itemBottom: {
+        paddingTop: 14,
+        paddingBottom: 16,
+        marginRight: 24,
+      },
+      indicator: {
+        position: 'absolute',
+        left: 0,
+        width: 1,
+        height: 3,
+      },
+    })
+  : StyleSheet.create({
+      outer: {
+        flexDirection: 'row',
+        paddingHorizontal: 14,
+      },
+      itemTop: {
+        paddingTop: 10,
+        paddingBottom: 10,
+        marginRight: 24,
+      },
+      itemBottom: {
+        paddingTop: 8,
+        paddingBottom: 12,
+        marginRight: 24,
+      },
+      indicator: {
+        position: 'absolute',
+        left: 0,
+        width: 1,
+        height: 3,
+        borderRadius: 4,
+      },
+    })
diff --git a/src/view/com/util/Pager.tsx b/src/view/com/util/pager/Pager.tsx
index d71cb7f7f..416828a27 100644
--- a/src/view/com/util/Pager.tsx
+++ b/src/view/com/util/pager/Pager.tsx
@@ -19,7 +19,7 @@ interface Props {
   tabBarPosition?: 'top' | 'bottom'
   initialPage?: number
   renderTabBar: RenderTabBarFn
-  onPageSelected?: (e: PageSelectedEvent) => void
+  onPageSelected?: (index: number) => void
 }
 export const Pager = ({
   children,
@@ -36,7 +36,7 @@ export const Pager = ({
   const onPageSelectedInner = React.useCallback(
     (e: PageSelectedEvent) => {
       setSelectedPage(e.nativeEvent.position)
-      onPageSelected?.(e)
+      onPageSelected?.(e.nativeEvent.position)
     },
     [setSelectedPage, onPageSelected],
   )
diff --git a/src/view/com/util/pager/Pager.web.tsx b/src/view/com/util/pager/Pager.web.tsx
new file mode 100644
index 000000000..d50100de9
--- /dev/null
+++ b/src/view/com/util/pager/Pager.web.tsx
@@ -0,0 +1,65 @@
+import React from 'react'
+import {Animated, View} from 'react-native'
+import {useAnimatedValue} from 'lib/hooks/useAnimatedValue'
+import {s} from 'lib/styles'
+
+export interface RenderTabBarFnProps {
+  selectedPage: number
+  position: Animated.Value
+  offset: Animated.Value
+  onSelect?: (index: number) => void
+}
+export type RenderTabBarFn = (props: RenderTabBarFnProps) => JSX.Element
+
+interface Props {
+  tabBarPosition?: 'top' | 'bottom'
+  initialPage?: number
+  renderTabBar: RenderTabBarFn
+  onPageSelected?: (index: number) => void
+}
+export const Pager = ({
+  children,
+  tabBarPosition = 'top',
+  initialPage = 0,
+  renderTabBar,
+  onPageSelected,
+}: React.PropsWithChildren<Props>) => {
+  const [selectedPage, setSelectedPage] = React.useState(initialPage)
+  const position = useAnimatedValue(0)
+  const offset = useAnimatedValue(0)
+
+  const onTabBarSelect = React.useCallback(
+    (index: number) => {
+      setSelectedPage(index)
+      onPageSelected?.(index)
+      Animated.timing(position, {
+        toValue: index,
+        duration: 200,
+        useNativeDriver: true,
+      }).start()
+    },
+    [setSelectedPage, onPageSelected, position],
+  )
+
+  return (
+    <View>
+      {tabBarPosition === 'top' &&
+        renderTabBar({
+          selectedPage,
+          position,
+          offset,
+          onSelect: onTabBarSelect,
+        })}
+      {children.map((child, i) => (
+        <View style={selectedPage === i ? undefined : s.hidden}>{child}</View>
+      ))}
+      {tabBarPosition === 'bottom' &&
+        renderTabBar({
+          selectedPage,
+          position,
+          offset,
+          onSelect: onTabBarSelect,
+        })}
+    </View>
+  )
+}
diff --git a/src/view/screens/Home.tsx b/src/view/screens/Home.tsx
index 822174446..4950bc0fd 100644
--- a/src/view/screens/Home.tsx
+++ b/src/view/screens/Home.tsx
@@ -1,11 +1,5 @@
 import React from 'react'
-import {
-  Animated,
-  FlatList,
-  StyleSheet,
-  View,
-  useWindowDimensions,
-} from 'react-native'
+import {FlatList, View, useWindowDimensions} from 'react-native'
 import {useFocusEffect, useIsFocused} from '@react-navigation/native'
 import {observer} from 'mobx-react-lite'
 import useAppState from 'react-native-appstate-hook'
@@ -15,25 +9,17 @@ import {withAuthRequired} from 'view/com/auth/withAuthRequired'
 import {Feed} from '../com/posts/Feed'
 import {FollowingEmptyState} from 'view/com/posts/FollowingEmptyState'
 import {LoadLatestBtn} from '../com/util/LoadLatestBtn'
-import {TabBar} from 'view/com/util/TabBar'
-import {
-  Pager,
-  PageSelectedEvent,
-  RenderTabBarFnProps,
-} from 'view/com/util/Pager'
+import {FeedsTabBar} from './home/FeedsTabBar'
+import {Pager, RenderTabBarFnProps} from 'view/com/util/pager/Pager'
 import {FAB} from '../com/util/FAB'
 import {useStores} from 'state/index'
-import {usePalette} from 'lib/hooks/usePalette'
 import {s} from 'lib/styles'
 import {useOnMainScroll} from 'lib/hooks/useOnMainScroll'
-import {useSafeAreaInsets} from 'react-native-safe-area-context'
-import {useAnimatedValue} from 'lib/hooks/useAnimatedValue'
 import {useAnalytics} from 'lib/analytics'
 import {ComposeIcon2} from 'lib/icons'
-import {clamp} from 'lodash'
+import {isDesktopWeb} from 'platform/detection'
 
 const TAB_BAR_HEIGHT = 82
-const BOTTOM_BAR_HEIGHT = 48
 
 type Props = NativeStackScreenProps<HomeTabNavigatorParams, 'Home'>
 export const HomeScreen = withAuthRequired((_opts: Props) => {
@@ -56,9 +42,9 @@ export const HomeScreen = withAuthRequired((_opts: Props) => {
   )
 
   const onPageSelected = React.useCallback(
-    (e: PageSelectedEvent) => {
-      setSelectedPage(e.nativeEvent.position)
-      store.shell.setIsDrawerSwipeDisabled(e.nativeEvent.position > 0)
+    (index: number) => {
+      setSelectedPage(index)
+      store.shell.setIsDrawerSwipeDisabled(index > 0)
     },
     [store],
   )
@@ -69,7 +55,7 @@ export const HomeScreen = withAuthRequired((_opts: Props) => {
 
   const renderTabBar = React.useCallback(
     (props: RenderTabBarFnProps) => {
-      return <FloatingTabBar {...props} onPressSelected={onPressSelected} />
+      return <FeedsTabBar {...props} onPressSelected={onPressSelected} />
     },
     [onPressSelected],
   )
@@ -83,7 +69,7 @@ export const HomeScreen = withAuthRequired((_opts: Props) => {
     <Pager
       onPageSelected={onPageSelected}
       renderTabBar={renderTabBar}
-      tabBarPosition="bottom"
+      tabBarPosition={isDesktopWeb ? 'top' : 'bottom'}
       initialPage={initialPage}>
       <FeedPage
         key="1"
@@ -96,48 +82,6 @@ export const HomeScreen = withAuthRequired((_opts: Props) => {
   )
 })
 
-const FloatingTabBar = observer(
-  (props: RenderTabBarFnProps & {onPressSelected: () => void}) => {
-    const store = useStores()
-    const safeAreaInsets = useSafeAreaInsets()
-    const pal = usePalette('default')
-    const interp = useAnimatedValue(0)
-
-    const pad = React.useMemo(
-      () => ({
-        paddingBottom: clamp(safeAreaInsets.bottom, 15, 20),
-      }),
-      [safeAreaInsets],
-    )
-
-    React.useEffect(() => {
-      Animated.timing(interp, {
-        toValue: store.shell.minimalShellMode ? 0 : 1,
-        duration: 100,
-        useNativeDriver: true,
-        isInteraction: false,
-      }).start()
-    }, [interp, store.shell.minimalShellMode])
-    const transform = {
-      transform: [
-        {translateY: Animated.multiply(interp, -1 * BOTTOM_BAR_HEIGHT)},
-      ],
-    }
-
-    return (
-      <Animated.View
-        style={[pal.view, pal.border, styles.tabBar, pad, transform]}>
-        <TabBar
-          {...props}
-          items={['Following', "What's hot"]}
-          indicatorPosition="top"
-          indicatorColor={pal.colors.link}
-        />
-      </Animated.View>
-    )
-  },
-)
-
 const FeedPage = observer(
   ({
     isPageFocused,
@@ -158,7 +102,7 @@ const FeedPage = observer(
     const isScreenFocused = useIsFocused()
     const winDim = useWindowDimensions()
     const containerStyle = React.useMemo(
-      () => ({height: winDim.height - TAB_BAR_HEIGHT}),
+      () => ({height: winDim.height - (isDesktopWeb ? 0 : TAB_BAR_HEIGHT)}),
       [winDim],
     )
 
@@ -249,21 +193,3 @@ const FeedPage = observer(
     )
   },
 )
-
-const styles = StyleSheet.create({
-  tabBar: {
-    position: 'absolute',
-    left: 0,
-    right: 0,
-    bottom: 0,
-    flexDirection: 'row',
-    alignItems: 'center',
-    paddingHorizontal: 10,
-    borderTopWidth: 1,
-    paddingTop: 0,
-    paddingBottom: 30,
-  },
-  tabBarAvi: {
-    marginRight: 4,
-  },
-})
diff --git a/src/view/screens/home/FeedsTabBar.tsx b/src/view/screens/home/FeedsTabBar.tsx
new file mode 100644
index 000000000..d34034103
--- /dev/null
+++ b/src/view/screens/home/FeedsTabBar.tsx
@@ -0,0 +1,72 @@
+import React from 'react'
+import {Animated, StyleSheet} from 'react-native'
+import {observer} from 'mobx-react-lite'
+import {TabBar} from 'view/com/util/TabBar'
+import {RenderTabBarFnProps} from 'view/com/util/pager/Pager'
+import {useStores} from 'state/index'
+import {usePalette} from 'lib/hooks/usePalette'
+import {useSafeAreaInsets} from 'react-native-safe-area-context'
+import {useAnimatedValue} from 'lib/hooks/useAnimatedValue'
+import {clamp} from 'lodash'
+
+const BOTTOM_BAR_HEIGHT = 48
+
+export const FeedsTabBar = observer(
+  (props: RenderTabBarFnProps & {onPressSelected: () => void}) => {
+    const store = useStores()
+    const safeAreaInsets = useSafeAreaInsets()
+    const pal = usePalette('default')
+    const interp = useAnimatedValue(0)
+
+    const pad = React.useMemo(
+      () => ({
+        paddingBottom: clamp(safeAreaInsets.bottom, 15, 20),
+      }),
+      [safeAreaInsets],
+    )
+
+    React.useEffect(() => {
+      Animated.timing(interp, {
+        toValue: store.shell.minimalShellMode ? 0 : 1,
+        duration: 100,
+        useNativeDriver: true,
+        isInteraction: false,
+      }).start()
+    }, [interp, store.shell.minimalShellMode])
+    const transform = {
+      transform: [
+        {translateY: Animated.multiply(interp, -1 * BOTTOM_BAR_HEIGHT)},
+      ],
+    }
+
+    return (
+      <Animated.View
+        style={[pal.view, pal.border, styles.tabBar, pad, transform]}>
+        <TabBar
+          {...props}
+          items={['Following', "What's hot"]}
+          indicatorPosition="top"
+          indicatorColor={pal.colors.link}
+        />
+      </Animated.View>
+    )
+  },
+)
+
+const styles = StyleSheet.create({
+  tabBar: {
+    position: 'absolute',
+    left: 0,
+    right: 0,
+    bottom: 0,
+    flexDirection: 'row',
+    alignItems: 'center',
+    paddingHorizontal: 10,
+    borderTopWidth: 1,
+    paddingTop: 0,
+    paddingBottom: 30,
+  },
+  tabBarAvi: {
+    marginRight: 4,
+  },
+})
diff --git a/src/view/screens/home/FeedsTabBar.web.tsx b/src/view/screens/home/FeedsTabBar.web.tsx
new file mode 100644
index 000000000..59ea42988
--- /dev/null
+++ b/src/view/screens/home/FeedsTabBar.web.tsx
@@ -0,0 +1,22 @@
+import React from 'react'
+import {observer} from 'mobx-react-lite'
+import {TabBar} from 'view/com/util/TabBar'
+import {CenteredView} from 'view/com/util/Views'
+import {RenderTabBarFnProps} from 'view/com/util/pager/Pager'
+import {usePalette} from 'lib/hooks/usePalette'
+
+export const FeedsTabBar = observer(
+  (props: RenderTabBarFnProps & {onPressSelected: () => void}) => {
+    const pal = usePalette('default')
+    return (
+      <CenteredView>
+        <TabBar
+          {...props}
+          items={['Following', "What's hot"]}
+          indicatorPosition="bottom"
+          indicatorColor={pal.colors.link}
+        />
+      </CenteredView>
+    )
+  },
+)