sample: pass event between screens

Author: hoc081098

sample/app/src/main/java/com/hoc081098/channeleventbus/sample/android/Route.kt

@@ -15,7 +15,7 @@ internal fun rememberCurrentRouteAsState(currentBackStackEntryAsState: State<Nav
       currentBackStackEntryAsState.value
         ?.destination
         ?.route
-        ?.let(Route.Companion::ofOrNull)
+        ?.let(Route::ofOrNull)
     }
   }
 
@@ -55,6 +55,8 @@ internal sealed class Route {
         RegisterStepOne,
         RegisterStepTwo,
         RegisterStepThree,
+        Home,
+        Detail,
       )
     }
 

sample/app/src/main/java/com/hoc081098/channeleventbus/sample/android/ui/home/detail/DetailScreen.kt

@@ -43,7 +43,7 @@ fun DetailScreen(
     Column(
       modifier = Modifier.matchParentSize(),
       horizontalAlignment = Alignment.CenterHorizontally,
-      verticalArrangement = Arrangement.Center,
+      verticalArrangement = Arrangement.Top,
     ) {
       Text(
         text = "Detail",
@@ -69,6 +69,7 @@ fun DetailScreen(
       Spacer(modifier = Modifier.height(16.dp))
 
       ElevatedButton(
+        enabled = text.isNotBlank(),
         onClick = {
           vm.sendResultToHome()
           navigateBack()

sample/app/src/main/java/com/hoc081098/channeleventbus/sample/android/ui/home/home/HomeVM.kt

@@ -10,7 +10,7 @@ import kotlinx.collections.immutable.plus
 import kotlinx.coroutines.CancellationException
 import kotlinx.coroutines.flow.SharingStarted
 import kotlinx.coroutines.flow.StateFlow
-import kotlinx.coroutines.flow.map
+import kotlinx.coroutines.flow.mapNotNull
 import kotlinx.coroutines.flow.onCompletion
 import kotlinx.coroutines.flow.scan
 import kotlinx.coroutines.flow.stateIn
@@ -25,8 +25,14 @@ class HomeVM(
       // Close the bus when this ViewModel is cleared.
       channelEventBus.closeKey(DetailResultToHomeEvent)
     }
-    .map { it.value }
-    .scan(persistentListOf<String>()) { acc, e -> acc + e }
+    .mapNotNull { it.value.takeIf(String::isNotBlank) }
+    .scan(persistentListOf<String>()) { acc, e ->
+      if (e in acc) {
+        acc
+      } else {
+        acc + e
+      }
+    }
     .stateIn(
       scope = viewModelScope,
       // Using SharingStarted.Lazily is enough, because the event bus is backed by a channel.