From 7eddd653c50ec55bad340079df0e6e536907c2dc Mon Sep 17 00:00:00 2001
From: Harsh Shandilya <me@msfjarvis.dev>
Date: Fri, 15 Oct 2021 14:26:29 +0530
Subject: [PATCH] android: refactor navigation destinations

---
 .../dev/msfjarvis/claw/android/ui/Destinations.kt      |  6 ++++++
 .../dev/msfjarvis/claw/android/ui/LobstersApp.kt       | 10 +++++++---
 2 files changed, 13 insertions(+), 3 deletions(-)
 create mode 100644 android/src/main/kotlin/dev/msfjarvis/claw/android/ui/Destinations.kt

diff --git a/android/src/main/kotlin/dev/msfjarvis/claw/android/ui/Destinations.kt b/android/src/main/kotlin/dev/msfjarvis/claw/android/ui/Destinations.kt
new file mode 100644
index 00000000..1e0d07e5
--- /dev/null
+++ b/android/src/main/kotlin/dev/msfjarvis/claw/android/ui/Destinations.kt
@@ -0,0 +1,6 @@
+package dev.msfjarvis.claw.android.ui
+
+object Destinations {
+  const val Hottest = "hottest"
+  const val Comments = "comments/%s"
+}
diff --git a/android/src/main/kotlin/dev/msfjarvis/claw/android/ui/LobstersApp.kt b/android/src/main/kotlin/dev/msfjarvis/claw/android/ui/LobstersApp.kt
index 7ec5985a..f3f223d5 100644
--- a/android/src/main/kotlin/dev/msfjarvis/claw/android/ui/LobstersApp.kt
+++ b/android/src/main/kotlin/dev/msfjarvis/claw/android/ui/LobstersApp.kt
@@ -50,6 +50,7 @@ fun LobstersApp(
   val scaffoldState = rememberScaffoldState()
   val listState = rememberLazyListState()
   val navController = rememberNavController()
+  var currentDestination by remember { mutableStateOf(Destinations.Hottest) }
   var isFabVisible by remember { mutableStateOf(true) }
   val nestedScrollConnection = remember {
     object : NestedScrollConnection {
@@ -74,7 +75,7 @@ fun LobstersApp(
       }
 
       override fun viewComments(postId: String) {
-        navController.navigate("comments/$postId")
+        navController.navigate(Destinations.Comments.format(postId))
       }
 
       override fun toggleSave(post: SavedPost) {
@@ -82,6 +83,9 @@ fun LobstersApp(
       }
     }
   }
+  navController.addOnDestinationChangedListener { _, destination, _ ->
+    currentDestination = destination.route ?: Destinations.Hottest
+  }
   LobstersTheme(darkTheme = isSystemInDarkTheme()) {
     ProvideWindowInsets {
       val useDarkIcons = MaterialTheme.colors.isLight
@@ -98,7 +102,7 @@ fun LobstersApp(
         topBar = { ClawAppBar(modifier = Modifier.statusBarsPadding()) },
         floatingActionButton = {
           ClawFab(
-            isFabVisible = isFabVisible && navController.currentDestination?.route == "hottest",
+            isFabVisible = isFabVisible && currentDestination == "hottest",
             listState = listState,
             modifier = Modifier.navigationBarsPadding(),
           )
@@ -115,7 +119,7 @@ fun LobstersApp(
               Modifier.nestedScroll(nestedScrollConnection),
             )
           }
-          composable("comments/{postId}") { backStackEntry ->
+          composable(Destinations.Comments.format("{postId}")) { backStackEntry ->
             CommentsPage(
               postId = requireNotNull(backStackEntry.arguments?.getString("postId")),
               getDetails = viewModel::getPostComments,