Start migrating messages screen

app/src/main/java/io/element/android/x/node/LoggedInFlowNode.kt

@@ -8,11 +8,8 @@ import com.bumble.appyx.core.modality.BuildContext
 import com.bumble.appyx.core.node.Node
 import com.bumble.appyx.core.node.ParentNode
 import com.bumble.appyx.navmodel.backstack.BackStack
-import com.bumble.appyx.navmodel.backstack.operation.pop
 import com.bumble.appyx.navmodel.backstack.operation.push
 import io.element.android.x.architecture.createNode
-import io.element.android.x.architecture.viewmodel.viewModelSupportNode
-import io.element.android.x.features.messages.MessagesScreen
 import io.element.android.x.features.preferences.PreferencesFlowNode
 import io.element.android.x.features.roomlist.RoomListNode
 import io.element.android.x.matrix.core.RoomId
@@ -34,7 +31,7 @@ class LoggedInFlowNode(
 
     private val roomListCallback = object : RoomListNode.Callback {
         override fun onRoomClicked(roomId: RoomId) {
-            backstack.push(NavTarget.Messages(roomId))
+            backstack.push(NavTarget.Room(roomId))
         }
 
         override fun onSettingsClicked() {
@@ -47,7 +44,7 @@ class LoggedInFlowNode(
         object RoomList : NavTarget
 
         @Parcelize
-        data class Messages(val roomId: RoomId) : NavTarget
+        data class Room(val roomId: RoomId) : NavTarget
 
         @Parcelize
         object Settings : NavTarget
@@ -58,11 +55,8 @@ class LoggedInFlowNode(
             NavTarget.RoomList -> {
                 createNode<RoomListNode>(buildContext, plugins = listOf(roomListCallback))
             }
-            is NavTarget.Messages -> viewModelSupportNode(buildContext) {
-                MessagesScreen(
-                    roomId = navTarget.roomId.value,
-                    onBackPressed = { backstack.pop() }
-                )
+            is NavTarget.Room -> {
+                RoomFlowNode(buildContext, navTarget.roomId)
             }
             NavTarget.Settings -> {
                 PreferencesFlowNode(buildContext, onOpenBugReport)

app/src/main/java/io/element/android/x/node/RoomFlowNode.kt

@@ -0,0 +1,52 @@
+package io.element.android.x.node
+
+import android.os.Parcelable
+import androidx.compose.runtime.Composable
+import androidx.compose.ui.Modifier
+import com.bumble.appyx.core.composable.Children
+import com.bumble.appyx.core.lifecycle.subscribe
+import com.bumble.appyx.core.modality.BuildContext
+import com.bumble.appyx.core.node.Node
+import com.bumble.appyx.core.node.ParentNode
+import com.bumble.appyx.navmodel.backstack.BackStack
+import io.element.android.x.architecture.createNode
+import io.element.android.x.features.messages.MessagesNode
+import io.element.android.x.matrix.core.RoomId
+import kotlinx.parcelize.Parcelize
+import timber.log.Timber
+
+class RoomFlowNode(
+    buildContext: BuildContext,
+    private val roomId: RoomId,
+    private val backstack: BackStack<NavTarget> = BackStack(
+        initialElement = NavTarget.Messages,
+        savedStateMap = buildContext.savedStateMap,
+    ),
+) : ParentNode<RoomFlowNode.NavTarget>(
+    navModel = backstack,
+    buildContext = buildContext
+) {
+
+    init {
+        lifecycle.subscribe(
+            onCreate = { Timber.v("OnCreate") },
+            onDestroy = { Timber.v("OnDestroy") }
+        )
+    }
+
+    override fun resolve(navTarget: NavTarget, buildContext: BuildContext): Node {
+        return when (navTarget) {
+            NavTarget.Messages -> createNode<MessagesNode>(buildContext)
+        }
+    }
+
+    sealed interface NavTarget : Parcelable {
+        @Parcelize
+        object Messages : NavTarget
+    }
+
+    @Composable
+    override fun View(modifier: Modifier) {
+        Children(navModel = backstack)
+    }
+}