UI: combine TopBarConfig and BottomBarConfig into each route's ScaffoldConfig

examples/llama.android/app/src/main/java/com/example/llama/revamp/MainActivity.kt

@@ -40,6 +40,8 @@ import com.example.llama.revamp.ui.components.AnimatedNavHost
 import com.example.llama.revamp.ui.components.AppNavigationDrawer
 import com.example.llama.revamp.ui.components.AppScaffold
 import com.example.llama.revamp.ui.components.BottomBarConfig
+import com.example.llama.revamp.ui.components.NavigationIcon
+import com.example.llama.revamp.ui.components.ScaffoldConfig
 import com.example.llama.revamp.ui.components.ScaffoldEvent
 import com.example.llama.revamp.ui.components.TopBarConfig
 import com.example.llama.revamp.ui.components.UnloadModelConfirmationDialog
@@ -147,66 +149,52 @@ fun AppContent(
     val openDrawer: () -> Unit = { coroutineScope.launch { drawerState.open() } }
 
     // Create scaffold's top & bottom bar configs based on current route
-    val topBarConfig = when (currentRoute) {
-        // (Home) Model selection screen
-        AppDestinations.MODEL_SELECTION_ROUTE -> {
-            TopBarConfig.Default(
+    val scaffoldConfig = when (currentRoute) {
+        // Model selection screen
+        AppDestinations.MODEL_SELECTION_ROUTE ->
+            ScaffoldConfig(
+                topBarConfig = TopBarConfig.Default(
                     title = "Models",
-                navigationIcon = TopBarConfig.NavigationIcon.Menu(openDrawer)
+                    navigationIcon = NavigationIcon.Menu(openDrawer)
                 )
-        }
-
-        // Settings screen
-        AppDestinations.SETTINGS_GENERAL_ROUTE -> {
-            TopBarConfig.Default(
-                title = "Settings",
-                navigationIcon = TopBarConfig.NavigationIcon.Back { navigationActions.navigateUp() }
             )
-        }
-
-        // Storage management screen
-        AppDestinations.MODELS_MANAGEMENT_ROUTE -> {
-            TopBarConfig.Storage(
-                title = "Models Management",
-                navigationIcon = TopBarConfig.NavigationIcon.Back { navigationActions.navigateUp() },
-                storageMetrics = storageMetrics
-            )
-        }
 
         // Model loading screen
-        AppDestinations.MODEL_LOADING_ROUTE -> {
-            TopBarConfig.Performance(
+        AppDestinations.MODEL_LOADING_ROUTE ->
+            ScaffoldConfig(
+                topBarConfig = TopBarConfig.Performance(
                     title = "Load Model",
-                navigationIcon = TopBarConfig.NavigationIcon.Back(handleBackWithModelCheck),
+                    navigationIcon = NavigationIcon.Back(handleBackWithModelCheck),
                     memoryMetrics = memoryUsage,
                     temperatureInfo = null
                 )
-        }
+            )
 
         // Benchmark and Conversation screens
-        AppDestinations.BENCHMARK_ROUTE, AppDestinations.CONVERSATION_ROUTE -> {
-            TopBarConfig.Performance(
+        AppDestinations.BENCHMARK_ROUTE, AppDestinations.CONVERSATION_ROUTE ->
+            ScaffoldConfig(
+                topBarConfig = TopBarConfig.Performance(
                     title = when(currentRoute) {
                         AppDestinations.CONVERSATION_ROUTE -> "Chat"
                         AppDestinations.BENCHMARK_ROUTE -> "Benchmark"
                         else -> "LlamaAndroid"
                     },
-                navigationIcon = TopBarConfig.NavigationIcon.Back(handleBackWithModelCheck),
+                    navigationIcon = NavigationIcon.Back(handleBackWithModelCheck),
                     memoryMetrics = memoryUsage,
                     temperatureInfo = Pair(temperatureInfo, useFahrenheit)
                 )
-        }
-
-        // Fallback for unknown routes
-        else -> {
-            TopBarConfig.Default(
-                title = "LlamaAndroid",
-                navigationIcon = TopBarConfig.NavigationIcon.None
             )
-        }
-    }
 
-    val bottomBarConfig = when (currentRoute) {
+        // Settings screen
+        AppDestinations.SETTINGS_GENERAL_ROUTE ->
+            ScaffoldConfig(
+                topBarConfig = TopBarConfig.Default(
+                    title = "Settings",
+                    navigationIcon = NavigationIcon.Back { navigationActions.navigateUp() }
+                )
+            )
+
+        // Storage management screen
         AppDestinations.MODELS_MANAGEMENT_ROUTE -> {
             // Collect the needed states
             val sortOrder by modelsManagementViewModel.sortOrder.collectAsState()
@@ -220,11 +208,11 @@ fun AppContent(
                 contract = ActivityResultContracts.OpenDocument()
             ) { uri -> uri?.let { modelsManagementViewModel.localModelFileSelected(it) } }
 
-            BottomBarConfig.ModelsManagement(
+            val bottomBarConfig = BottomBarConfig.ModelsManagement(
                 sorting = BottomBarConfig.ModelsManagement.SortingConfig(
                     currentOrder = sortOrder,
                     isMenuVisible = showSortMenu,
-                    toggleMenu = { show -> modelsManagementViewModel.toggleSortMenu(show) },
+                    toggleMenu = { modelsManagementViewModel.toggleSortMenu(it) },
                     selectOrder = {
                         modelsManagementViewModel.setSortOrder(it)
                         modelsManagementViewModel.toggleSortMenu(false)
@@ -235,9 +223,9 @@ fun AppContent(
                 ),
                 selection = BottomBarConfig.ModelsManagement.SelectionConfig(
                     isActive = isMultiSelectionMode,
-                    toggleMode = { enabled -> modelsManagementViewModel.toggleSelectionMode(enabled) },
+                    toggleMode = { modelsManagementViewModel.toggleSelectionMode(it) },
                     selectedModels = selectedModels,
-                    toggleAllSelection = { selectAll -> modelsManagementViewModel.toggleAllSelection(selectAll) },
+                    toggleAllSelection = { modelsManagementViewModel.toggleAllSelection(it) },
                     deleteSelected = {
                         if (selectedModels.isNotEmpty()) {
                             modelsManagementViewModel.batchDeletionClicked(selectedModels)
@@ -255,10 +243,23 @@ fun AppContent(
                         modelsManagementViewModel.importFromHuggingFace()
                         modelsManagementViewModel.toggleImportMenu(false)
                     }
+                )
+            )
+
+            ScaffoldConfig(
+                topBarConfig = TopBarConfig.Storage(
+                    title = "Models Management",
+                    navigationIcon = NavigationIcon.Back { navigationActions.navigateUp() },
+                    storageMetrics = storageMetrics
                 ),
+                bottomBarConfig = bottomBarConfig
             )
         }
-        else -> BottomBarConfig.None
+
+        // Fallback for empty screen or unknown routes
+        else -> ScaffoldConfig(
+            topBarConfig = TopBarConfig.Default(title = "", navigationIcon = NavigationIcon.None)
+        )
     }
 
     // Handle child screens' scaffold events
@@ -309,8 +310,8 @@ fun AppContent(
     ) {
         // The AppScaffold now uses the config we created
         AppScaffold(
-            topBarconfig = topBarConfig,
-            bottomBarConfig = bottomBarConfig,
+            topBarconfig = scaffoldConfig.topBarConfig,
+            bottomBarConfig = scaffoldConfig.bottomBarConfig,
             snackbarHostState = snackbarHostState,
         ) { paddingValues ->
             // AnimatedNavHost inside the scaffold content

examples/llama.android/app/src/main/java/com/example/llama/revamp/ui/components/AppScaffold.kt

@@ -8,6 +8,13 @@ import androidx.compose.material3.SnackbarHostState
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.remember
 
+/**
+ * Configuration of both [TopBarConfig] and [BottomBarConfig]
+ */
+data class ScaffoldConfig(
+    val topBarConfig: TopBarConfig,
+    val bottomBarConfig: BottomBarConfig = BottomBarConfig.None
+)
 
 /**
  * Events called back from child screens
@@ -38,8 +45,8 @@ fun AppScaffold(
                     title = topBarconfig.title,
                     memoryMetrics = topBarconfig.memoryMetrics,
                     temperatureDisplay = topBarconfig.temperatureInfo,
-                    onNavigateBack = (topBarconfig.navigationIcon as? TopBarConfig.NavigationIcon.Back)?.onNavigateBack,
-                    onMenuOpen = (topBarconfig.navigationIcon as? TopBarConfig.NavigationIcon.Menu)?.onMenuOpen
+                    onNavigateBack = (topBarconfig.navigationIcon as? NavigationIcon.Back)?.onNavigateBack,
+                    onMenuOpen = (topBarconfig.navigationIcon as? NavigationIcon.Menu)?.onMenuOpen
                 )
             }
 
@@ -47,15 +54,15 @@ fun AppScaffold(
                 StorageTopBar(
                     title = topBarconfig.title,
                     storageMetrics = topBarconfig.storageMetrics,
-                    onNavigateBack = (topBarconfig.navigationIcon as? TopBarConfig.NavigationIcon.Back)?.onNavigateBack
+                    onNavigateBack = (topBarconfig.navigationIcon as? NavigationIcon.Back)?.onNavigateBack
                 )
             }
 
             is TopBarConfig.Default -> {
                 DefaultTopBar(
                     title = topBarconfig.title,
-                    onNavigateBack = (topBarconfig.navigationIcon as? TopBarConfig.NavigationIcon.Back)?.onNavigateBack,
-                    onMenuOpen = (topBarconfig.navigationIcon as? TopBarConfig.NavigationIcon.Menu)?.onMenuOpen
+                    onNavigateBack = (topBarconfig.navigationIcon as? NavigationIcon.Back)?.onNavigateBack,
+                    onMenuOpen = (topBarconfig.navigationIcon as? NavigationIcon.Menu)?.onMenuOpen
                 )
             }
         }

examples/llama.android/app/src/main/java/com/example/llama/revamp/ui/components/TopAppBars.kt

@@ -35,7 +35,13 @@ sealed class TopBarConfig {
     abstract val title: String
     abstract val navigationIcon: NavigationIcon
 
-    // Data class for performance monitoring scaffolds
+    // Default/simple top bar with only a navigation icon
+    data class Default(
+        override val title: String,
+        override val navigationIcon: NavigationIcon
+    ) : TopBarConfig()
+
+    // Performance monitoring top bar with RAM and optional temperature
     data class Performance(
         override val title: String,
         override val navigationIcon: NavigationIcon,
@@ -43,25 +49,21 @@ sealed class TopBarConfig {
         val temperatureInfo: Pair<TemperatureMetrics, Boolean>?,
     ) : TopBarConfig()
 
-    // Data class for storage management scaffolds
+    // Storage management top bar with used & total storage
     data class Storage(
         override val title: String,
         override val navigationIcon: NavigationIcon,
         val storageMetrics: StorageMetrics?
     ) : TopBarConfig()
-
-    // Data class for default/simple scaffolds
-    data class Default(
-        override val title: String,
-        override val navigationIcon: NavigationIcon
-    ) : TopBarConfig()
-
-    // Helper class for navigation icon configuration
-    sealed class NavigationIcon {
-        data class Menu(val onMenuOpen: () -> Unit) : NavigationIcon()
-        data class Back(val onNavigateBack: () -> Unit) : NavigationIcon()
-        object None : NavigationIcon()
 }
+
+/**
+ * Helper class for navigation icon configuration
+ */
+sealed class NavigationIcon {
+    data class Back(val onNavigateBack: () -> Unit) : NavigationIcon()
+    data class Menu(val onMenuOpen: () -> Unit) : NavigationIcon()
+    object None : NavigationIcon()
 }
 
 @OptIn(ExperimentalMaterial3Api::class)