refactor: pull out ClawAppBar

Also change consumers of ClawBackStack to take delegating references

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

@@ -0,0 +1,75 @@
+/*
+ * Copyright © Harsh Shandilya.
+ * Use of this source code is governed by an MIT-style
+ * license that can be found in the LICENSE file or at
+ * https://opensource.org/licenses/MIT.
+ */
+package dev.msfjarvis.claw.android.ui.decorations
+
+import android.app.Activity
+import androidx.compose.foundation.layout.size
+import androidx.compose.material.icons.Icons
+import androidx.compose.material.icons.automirrored.filled.ArrowBack
+import androidx.compose.material.icons.filled.Search
+import androidx.compose.material.icons.filled.Tune
+import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.material3.Icon
+import androidx.compose.material3.IconButton
+import androidx.compose.material3.Text
+import androidx.compose.material3.TopAppBar
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.shadow
+import androidx.compose.ui.res.painterResource
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.unit.dp
+import dev.msfjarvis.claw.android.R
+import dev.msfjarvis.claw.android.ui.navigation.Destination
+import dev.msfjarvis.claw.android.ui.navigation.Search
+import dev.msfjarvis.claw.android.ui.navigation.Settings
+
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun ClawAppBar(
+  activity: Activity?,
+  isTopLevel: Boolean,
+  navigateTo: (Destination) -> Unit,
+  popBackStack: () -> Destination?,
+  modifier: Modifier = Modifier,
+) {
+  TopAppBar(
+    modifier = modifier.shadow(8.dp),
+    navigationIcon = {
+      if (!isTopLevel) {
+        IconButton(onClick = { if (popBackStack() == null) activity?.finish() }) {
+          Icon(
+            imageVector = Icons.AutoMirrored.Filled.ArrowBack,
+            contentDescription = "Go back to previous screen",
+          )
+        }
+      } else {
+        Icon(
+          painter = painterResource(id = R.drawable.ic_launcher_foreground),
+          contentDescription = "The app icon for Claw",
+          modifier = Modifier.size(48.dp),
+        )
+      }
+    },
+    title = {
+      if (isTopLevel) {
+        Text(text = stringResource(R.string.app_name), fontWeight = FontWeight.Bold)
+      }
+    },
+    actions = {
+      if (isTopLevel) {
+        IconButton(onClick = { navigateTo(Search) }) {
+          Icon(imageVector = Icons.Filled.Search, contentDescription = "Search posts")
+        }
+        IconButton(onClick = { navigateTo(Settings) }) {
+          Icon(imageVector = Icons.Filled.Tune, contentDescription = "Settings")
+        }
+      }
+    },
+  )
+}

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

@@ -31,7 +31,6 @@ import dev.chrisbanes.haze.HazeState
 import dev.chrisbanes.haze.HazeStyle
 import dev.chrisbanes.haze.hazeEffect
 import dev.msfjarvis.claw.android.ui.navigation.AppDestinations
-import dev.msfjarvis.claw.android.ui.navigation.ClawBackStack
 import dev.msfjarvis.claw.android.ui.navigation.Destination
 import dev.msfjarvis.claw.common.ui.FloatingNavigationBar
 import kotlinx.collections.immutable.ImmutableList
@@ -40,8 +39,9 @@ const val AnimationDuration = 100
 
 @Composable
 fun ClawNavigationBar(
-  backStack: ClawBackStack<Destination>,
   items: ImmutableList<NavigationItem>,
+  currentDestination: Destination?,
+  navigateTo: (Destination) -> Unit,
   isVisible: Boolean,
   hazeState: HazeState,
   modifier: Modifier = Modifier,
@@ -83,7 +83,6 @@ fun ClawNavigationBar(
         containerColor =
           if (HazeDefaults.blurEnabled()) Color.Transparent else MaterialTheme.colorScheme.surface,
       ) {
-        val currentDestination = backStack.firstOrNull()
         items.forEach { navItem ->
           val isSelected = currentDestination == navItem.destination
           NavigationBarItem(
@@ -101,7 +100,7 @@ fun ClawNavigationBar(
               if (isSelected) {
                 navItem.listStateResetCallback()
               } else {
-                backStack.add(navItem.destination)
+                navigateTo(navItem.destination)
               }
             },
             modifier = Modifier.testTag(navItem.label.uppercase()),

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

@@ -21,14 +21,14 @@ import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.platform.testTag
-import dev.msfjarvis.claw.android.ui.navigation.ClawBackStack
 import dev.msfjarvis.claw.android.ui.navigation.Destination
 import kotlinx.collections.immutable.ImmutableList
 
 @Composable
 fun ClawNavigationRail(
-  backStack: ClawBackStack<Destination>,
   items: ImmutableList<NavigationItem>,
+  currentDestination: Destination?,
+  navigateTo: (Destination) -> Unit,
   isVisible: Boolean,
   modifier: Modifier = Modifier,
 ) {
@@ -49,7 +49,6 @@ fun ClawNavigationRail(
     modifier = Modifier,
   ) {
     NavigationRail(modifier = modifier) {
-      val currentDestination = backStack.firstOrNull()
       Spacer(Modifier.weight(1f))
       items.forEach { navItem ->
         val isSelected = currentDestination == navItem.destination
@@ -68,7 +67,7 @@ fun ClawNavigationRail(
             if (isSelected) {
               navItem.listStateResetCallback()
             } else {
-              backStack.add(navItem.destination)
+              navigateTo(navItem.destination)
             }
           },
           modifier = Modifier.testTag(navItem.label.uppercase()),

android/src/main/kotlin/dev/msfjarvis/claw/android/ui/screens/Nav3Screen.kt

@@ -15,20 +15,11 @@ import androidx.compose.animation.slideInHorizontally
 import androidx.compose.animation.slideOutHorizontally
 import androidx.compose.animation.togetherWith
 import androidx.compose.foundation.layout.fillMaxSize
-import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.lazy.rememberLazyListState
-import androidx.compose.material.icons.Icons
-import androidx.compose.material.icons.automirrored.filled.ArrowBack
-import androidx.compose.material.icons.filled.Search
-import androidx.compose.material.icons.filled.Tune
 import androidx.compose.material3.ExperimentalMaterial3Api
-import androidx.compose.material3.Icon
-import androidx.compose.material3.IconButton
 import androidx.compose.material3.Scaffold
 import androidx.compose.material3.SnackbarHost
 import androidx.compose.material3.SnackbarHostState
-import androidx.compose.material3.Text
-import androidx.compose.material3.TopAppBar
 import androidx.compose.material3.windowsizeclass.WindowSizeClass
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
@@ -36,14 +27,9 @@ import androidx.compose.runtime.getValue
 import androidx.compose.runtime.remember
 import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.ui.Modifier
-import androidx.compose.ui.draw.shadow
 import androidx.compose.ui.platform.LocalContext
-import androidx.compose.ui.res.painterResource
-import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.semantics.semantics
 import androidx.compose.ui.semantics.testTagsAsResourceId
-import androidx.compose.ui.text.font.FontWeight
-import androidx.compose.ui.unit.dp
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import androidx.navigation3.runtime.entry
 import androidx.navigation3.runtime.entryProvider
@@ -54,8 +40,8 @@ import com.mikepenz.aboutlibraries.ui.compose.m3.LibrariesContainer
 import dev.chrisbanes.haze.HazeState
 import dev.chrisbanes.haze.hazeSource
 import dev.msfjarvis.claw.android.MainActivity
-import dev.msfjarvis.claw.android.R
 import dev.msfjarvis.claw.android.ui.PostActions
+import dev.msfjarvis.claw.android.ui.decorations.ClawAppBar
 import dev.msfjarvis.claw.android.ui.decorations.ClawNavigationBar
 import dev.msfjarvis.claw.android.ui.decorations.NavigationItem
 import dev.msfjarvis.claw.android.ui.lists.DatabasePosts
@@ -138,48 +124,20 @@ fun Nav3Screen(
 
   Scaffold(
     topBar = {
-      TopAppBar(
-        modifier = Modifier.shadow(8.dp),
-        navigationIcon = {
-          if (!(clawBackStack.isOnTopLevelDestination())) {
-            IconButton(
-              onClick = { if (clawBackStack.removeLastOrNull() == null) activity?.finish() }
-            ) {
-              Icon(
-                imageVector = Icons.AutoMirrored.Filled.ArrowBack,
-                contentDescription = "Go back to previous screen",
-              )
-            }
-          } else {
-            Icon(
-              painter = painterResource(id = R.drawable.ic_launcher_foreground),
-              contentDescription = "The app icon for Claw",
-              modifier = Modifier.size(48.dp),
-            )
-          }
-        },
-        title = {
-          if (clawBackStack.isOnTopLevelDestination()) {
-            Text(text = stringResource(R.string.app_name), fontWeight = FontWeight.Bold)
-          }
-        },
-        actions = {
-          if (clawBackStack.isOnTopLevelDestination()) {
-            IconButton(onClick = { clawBackStack.add(Search) }) {
-              Icon(imageVector = Icons.Filled.Search, contentDescription = "Search posts")
-            }
-            IconButton(onClick = { clawBackStack.add(Settings) }) {
-              Icon(imageVector = Icons.Filled.Tune, contentDescription = "Settings")
-            }
-          }
-        },
+      ClawAppBar(
+        activity = activity,
+        isTopLevel = clawBackStack.isOnTopLevelDestination(),
+        navigateTo = { clawBackStack.add(it) },
+        popBackStack = { clawBackStack.removeLastOrNull() },
       )
     },
     bottomBar = {
+      val currentDestination = clawBackStack.firstOrNull()
       AnimatedVisibility(visible = navigationType == ClawNavigationType.BOTTOM_NAVIGATION) {
         ClawNavigationBar(
-          clawBackStack,
           items = navItems,
+          currentDestination = currentDestination,
+          navigateTo = { clawBackStack.add(it) },
           isVisible = clawBackStack.isOnTopLevelDestination(),
           hazeState = hazeState,
         )