android: replace ClawFab with a NavigationBar interaction

android/src/main/kotlin/dev/msfjarvis/claw/android/ui/LobstersApp.kt

@@ -10,11 +10,8 @@ import androidx.compose.runtime.LaunchedEffect
 import androidx.compose.runtime.SideEffect
 import androidx.compose.runtime.collectAsState
 import androidx.compose.runtime.getValue
-import androidx.compose.runtime.mutableStateOf
-import androidx.compose.runtime.remember
-import androidx.compose.runtime.setValue
+import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.ui.Modifier
-import androidx.compose.ui.input.nestedscroll.nestedScroll
 import androidx.compose.ui.platform.LocalConfiguration
 import androidx.compose.ui.platform.LocalContext
 import androidx.compose.ui.platform.LocalUriHandler
@@ -31,7 +28,6 @@ import com.google.accompanist.insets.statusBarsPadding
 import com.google.accompanist.systemuicontroller.rememberSystemUiController
 import dev.msfjarvis.claw.android.R
 import dev.msfjarvis.claw.android.ui.decorations.ClawAppBar
-import dev.msfjarvis.claw.android.ui.decorations.ClawFab
 import dev.msfjarvis.claw.android.ui.decorations.ClawNavigationBar
 import dev.msfjarvis.claw.android.ui.decorations.NavigationItem
 import dev.msfjarvis.claw.android.ui.lists.DatabasePosts
@@ -44,6 +40,7 @@ import dev.msfjarvis.claw.common.comments.HTMLConverter
 import dev.msfjarvis.claw.common.comments.LocalHTMLConverter
 import dev.msfjarvis.claw.common.theme.LobstersTheme
 import dev.msfjarvis.claw.common.urllauncher.UrlLauncher
+import kotlinx.coroutines.launch
 
 @OptIn(ExperimentalMaterial3Api::class)
 @Composable
@@ -53,14 +50,12 @@ fun LobstersApp(
   htmlConverter: HTMLConverter,
   setWebUri: (String?) -> Unit,
 ) {
-  var isFabVisible by remember { mutableStateOf(false) }
-
   val systemUiController = rememberSystemUiController()
   val networkListState = rememberLazyListState()
   val savedListState = rememberLazyListState()
   val navController = rememberNavController()
+  val coroutineScope = rememberCoroutineScope()
   val postActions = rememberPostActions(urlLauncher, navController, viewModel)
-  val nestedScrollConnection = rememberNestedScrollConnection { isFabVisible = it }
   val currentDestination by currentNavigationDestination(navController)
 
   val networkPosts = viewModel.pagerFlow.collectAsLazyPagingItems()
@@ -81,12 +76,12 @@ fun LobstersApp(
             label = "Hottest",
             route = Destinations.Hottest.getRoute(),
             icon = painterResource(R.drawable.ic_whatshot_24dp),
-          ),
+          ) { coroutineScope.launch { networkListState.animateScrollToItem(index = 0) } },
           NavigationItem(
             label = "Saved",
             route = Destinations.Saved.getRoute(),
             icon = painterResource(commonR.drawable.ic_favorite_24dp),
-          ),
+          ) { coroutineScope.launch { savedListState.animateScrollToItem(index = 0) } },
         )
 
       SideEffect { systemUiController.setStatusBarColor(color = systemBarsColor) }
@@ -109,12 +104,6 @@ fun LobstersApp(
             modifier = Modifier.statusBarsPadding(),
           )
         },
-        floatingActionButton = {
-          ClawFab(
-            isFabVisible = isFabVisible && currentDestination == Destinations.Hottest.getRoute(),
-            listState = networkListState,
-          )
-        },
         bottomBar = {
           ClawNavigationBar(
             navController = navController,
@@ -136,7 +125,6 @@ fun LobstersApp(
               isPostSaved = viewModel::isPostSaved,
               reloadPosts = viewModel::reloadPosts,
               postActions = postActions,
-              modifier = Modifier.nestedScroll(nestedScrollConnection),
             )
           }
           composable(Destinations.Saved.getRoute()) {
@@ -146,9 +134,7 @@ fun LobstersApp(
               listState = savedListState,
               isSaved = viewModel::isPostSaved,
               postActions = postActions,
-              modifier =
-                Modifier.nestedScroll(nestedScrollConnection)
-                  .padding(bottom = paddingValues.calculateBottomPadding()),
+              modifier = Modifier.padding(bottom = paddingValues.calculateBottomPadding()),
             )
           }
           composable(Destinations.Comments.getRoute("{postId}")) { backStackEntry ->

android/src/main/kotlin/dev/msfjarvis/claw/android/ui/decorations/ClawFab.kt

@@ -1,38 +0,0 @@
-package dev.msfjarvis.claw.android.ui.decorations
-
-import androidx.compose.animation.AnimatedVisibility
-import androidx.compose.animation.ExperimentalAnimationApi
-import androidx.compose.foundation.lazy.LazyListState
-import androidx.compose.material3.FloatingActionButton
-import androidx.compose.material3.Icon
-import androidx.compose.runtime.Composable
-import androidx.compose.runtime.rememberCoroutineScope
-import androidx.compose.ui.Modifier
-import androidx.compose.ui.res.painterResource
-import dev.msfjarvis.claw.android.R
-import dev.msfjarvis.claw.android.ui.slideInAnimation
-import dev.msfjarvis.claw.android.ui.slideOutAnimation
-import kotlinx.coroutines.launch
-
-@OptIn(ExperimentalAnimationApi::class)
-@Composable
-fun ClawFab(
-  isFabVisible: Boolean,
-  listState: LazyListState,
-  modifier: Modifier = Modifier,
-) {
-  val coroutineScope = rememberCoroutineScope()
-  AnimatedVisibility(
-    visible = isFabVisible,
-    enter = slideInAnimation(),
-    exit = slideOutAnimation(),
-    modifier = modifier,
-  ) {
-    FloatingActionButton(onClick = { coroutineScope.launch { listState.animateScrollToItem(0) } }) {
-      Icon(
-        painter = painterResource(R.drawable.ic_arrow_upward_24dp),
-        contentDescription = null,
-      )
-    }
-  }
-}

android/src/main/kotlin/dev/msfjarvis/claw/android/ui/decorations/ClawNavigationBar.kt

@@ -33,7 +33,10 @@ fun ClawNavigationBar(
           label = { Text(text = navItem.label) },
           selected = navController.currentDestination?.route == navItem.route,
           onClick = {
-            if (navController.currentDestination?.route == navItem.route) return@NavigationBarItem
+            if (navController.currentDestination?.route == navItem.route) {
+              navItem.listStateResetCallback()
+              return@NavigationBarItem
+            }
             navController.popBackStack(navController.graph.startDestinationRoute!!, false)
             if (navItem.route != Destinations.startDestination.getRoute()) {
               navController.navigate(navItem.route)
@@ -49,4 +52,5 @@ class NavigationItem(
   val label: String,
   val route: String,
   val icon: Painter,
+  val listStateResetCallback: () -> Unit,
 )

android/src/main/kotlin/dev/msfjarvis/claw/android/ui/ext.kt

@@ -18,11 +18,8 @@ import androidx.compose.runtime.Composable
 import androidx.compose.runtime.State
 import androidx.compose.runtime.mutableStateOf
 import androidx.compose.runtime.remember
-import androidx.compose.ui.geometry.Offset
 import androidx.compose.ui.graphics.Color
 import androidx.compose.ui.graphics.compositeOver
-import androidx.compose.ui.input.nestedscroll.NestedScrollConnection
-import androidx.compose.ui.input.nestedscroll.NestedScrollSource
 import androidx.compose.ui.unit.dp
 import androidx.navigation.NavController
 import dev.msfjarvis.claw.android.ui.navigation.Destinations
@@ -108,28 +105,6 @@ fun rememberPostActions(
   }
 }
 
-private const val ScrollDelta = 50
-
-@Composable
-fun rememberNestedScrollConnection(setVisibility: (Boolean) -> Unit): NestedScrollConnection {
-  return remember {
-    object : NestedScrollConnection {
-      override fun onPreScroll(available: Offset, source: NestedScrollSource): Offset {
-        val delta = available.y
-
-        if (delta > ScrollDelta) {
-          setVisibility(true)
-        } else if (delta < -ScrollDelta) {
-          setVisibility(false)
-        }
-
-        // We didn't consume any offset here so return Offset.Zero
-        return Offset.Zero
-      }
-    }
-  }
-}
-
 /**
  * Returns the [ColorScheme.surface] color with an alpha of the [ColorScheme.primary] color overlaid
  * on top of it. Computes the surface tonal color at different elevation levels e.g. surface1

android/src/main/res/drawable/ic_arrow_upward_24dp.xml

@@ -1,10 +0,0 @@
-<vector xmlns:android="http://schemas.android.com/apk/res/android"
-  android:width="24dp"
-  android:height="24dp"
-  android:viewportWidth="24"
-  android:viewportHeight="24"
-  android:tint="?attr/colorControlNormal">
-  <path
-    android:fillColor="@android:color/white"
-    android:pathData="M4,12l1.41,1.41L11,7.83V20h2V7.83l5.58,5.59L20,12l-8,-8 -8,8z"/>
-</vector>