refactor: simplify passing args to `MessagesFragment`

app/src/main/java/com/geeksville/mesh/model/UIState.kt

@@ -190,9 +190,27 @@ class UIViewModel @Inject constructor(
         debug("ViewModel created")
     }
 
-    private val contactKey: MutableStateFlow<String> = MutableStateFlow(DataPacket.ID_BROADCAST)
+    private val _contactKey = MutableStateFlow("0${DataPacket.ID_BROADCAST}")
+    val contactKey: StateFlow<String> = _contactKey
     fun setContactKey(contact: String) {
-        contactKey.value = contact
+        _contactKey.value = contact
+    }
+
+    fun getContactName(contactKey: String): String {
+        val (channel, dest) = contactKey[0].digitToIntOrNull() to contactKey.substring(1)
+
+        return if (channel == null || dest == DataPacket.ID_BROADCAST) {
+            // grab channel names from ChannelSet
+            val channelName = with(channelSet) {
+                if (channel != null && settingsCount > channel)
+                    Channel(settingsList[channel], loraConfig).name else null
+            }
+            channelName ?: app.getString(R.string.channel_name)
+        } else {
+            // grab usernames from NodeInfo
+            val node = nodeDB.nodes.value[dest]
+            node?.user?.longName ?: app.getString(R.string.unknown_username)
+        }
     }
 
     @OptIn(ExperimentalCoroutinesApi::class)
@@ -237,7 +255,7 @@ class UIViewModel @Inject constructor(
         }
     }
 
-    fun sendMessage(str: String, contactKey: String = "0${DataPacket.ID_BROADCAST}") {
+    fun sendMessage(str: String, contactKey: String = this.contactKey.value) {
         // contactKey: unique contact key filter (channel)+(nodeId)
         val channel = contactKey[0].digitToIntOrNull()
         val dest = if (channel != null) contactKey.substring(1) else contactKey

app/src/main/java/com/geeksville/mesh/ui/ContactsFragment.kt

@@ -7,9 +7,7 @@ import android.view.*
 import androidx.appcompat.app.AppCompatActivity
 import androidx.appcompat.view.ActionMode
 import androidx.core.content.ContextCompat
-import androidx.core.os.bundleOf
 import androidx.fragment.app.activityViewModels
-import androidx.fragment.app.setFragmentResult
 import androidx.lifecycle.asLiveData
 import androidx.recyclerview.widget.LinearLayoutManager
 import androidx.recyclerview.widget.RecyclerView
@@ -122,10 +120,7 @@ class ContactsFragment : ScreenFragment("Messages"), Logging {
                 if (actionMode != null) clickItem(holder, packet.contact_key)
                 else {
                     debug("calling MessagesFragment filter:${packet.contact_key}")
-                    setFragmentResult(
-                        "requestKey",
-                        bundleOf("contactKey" to packet.contact_key, "contactName" to longName)
-                    )
+                    model.setContactKey(packet.contact_key)
                     parentFragmentManager.beginTransaction()
                         .replace(R.id.mainActivityLayout, MessagesFragment())
                         .addToBackStack(null)

app/src/main/java/com/geeksville/mesh/ui/MessagesFragment.kt

@@ -13,7 +13,6 @@ import androidx.core.content.ContextCompat
 import androidx.core.view.allViews
 import androidx.fragment.app.Fragment
 import androidx.fragment.app.activityViewModels
-import androidx.fragment.app.setFragmentResultListener
 import androidx.lifecycle.asLiveData
 import androidx.recyclerview.widget.LinearLayoutManager
 import androidx.recyclerview.widget.RecyclerView
@@ -43,13 +42,9 @@ class MessagesFragment : Fragment(), Logging {
 
     // This property is only valid between onCreateView and onDestroyView.
     private val binding get() = _binding!!
-    private var contactKey: String = DataPacket.ID_BROADCAST
-    private var contactName: String = DataPacket.ID_BROADCAST
 
     private val model: UIViewModel by activityViewModels()
 
-    private var isConnected = false
-
     // Provide a direct reference to each of the views within a data item
     // Used to cache the views within the item layout for fast access
     class ViewHolder(itemView: AdapterMessageLayoutBinding) :
@@ -240,12 +235,6 @@ class MessagesFragment : Fragment(), Logging {
         return binding.root
     }
 
-    override fun onSaveInstanceState(outState: Bundle) {
-        super.onSaveInstanceState(outState)
-        outState.putString("contactKey", contactKey)
-        outState.putString("contactName", contactName)
-    }
-
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)
 
@@ -253,25 +242,12 @@ class MessagesFragment : Fragment(), Logging {
             parentFragmentManager.popBackStack()
         }
 
-        setFragmentResultListener("requestKey") { _, bundle->
-            // get the result from bundle
-            contactKey = bundle.getString("contactKey").toString()
-            contactName = bundle.getString("contactName").toString()
-            model.setContactKey(contactKey)
-            binding.messageTitle.text = contactName
-        }
-        if (savedInstanceState != null) {
-            contactKey = savedInstanceState.getString("contactKey").toString()
-            contactName = savedInstanceState.getString("contactName").toString()
-            binding.messageTitle.text = contactName
-        }
-
         binding.sendButton.setOnClickListener {
             debug("User clicked sendButton")
 
             val str = binding.messageInputText.text.toString().trim()
             if (str.isNotEmpty())
-                model.sendMessage(str, contactKey)
+                model.sendMessage(str)
             binding.messageInputText.setText("") // blow away the string the user just entered
 
             // requireActivity().hideKeyboard()
@@ -281,7 +257,7 @@ class MessagesFragment : Fragment(), Logging {
             debug("received IME_ACTION_SEND")
 
             val str = binding.messageInputText.text.toString().trim()
-            if (str.isNotEmpty()) model.sendMessage(str, contactKey)
+            if (str.isNotEmpty()) model.sendMessage(str)
             binding.messageInputText.setText("") // blow away the string the user just entered
 
             // requireActivity().hideKeyboard()
@@ -300,7 +276,7 @@ class MessagesFragment : Fragment(), Logging {
         // If connection state _OR_ myID changes we have to fix our ability to edit outgoing messages
         model.connectionState.observe(viewLifecycleOwner) {
             // If we don't know our node ID and we are offline don't let user try to send
-            isConnected = model.isConnected()
+            val isConnected = model.isConnected()
             binding.textInputLayout.isEnabled = isConnected
             binding.sendButton.isEnabled = isConnected
             for (subView: View in binding.quickChatLayout.allViews) {
@@ -310,6 +286,10 @@ class MessagesFragment : Fragment(), Logging {
             }
         }
 
+        model.contactKey.asLiveData().observe(viewLifecycleOwner) {
+            binding.messageTitle.text = model.getContactName(it)
+        }
+
         model.quickChatActions.asLiveData().observe(viewLifecycleOwner) { actions ->
             actions?.let {
                 // This seems kinda hacky it might be better to replace with a recycler view
@@ -317,7 +297,7 @@ class MessagesFragment : Fragment(), Logging {
                 for (action in actions) {
                     val button = Button(context)
                     button.text = action.name
-                    button.isEnabled = isConnected
+                    button.isEnabled = model.isConnected()
                     if (action.mode == QuickChatAction.Mode.Instant) {
                         button.backgroundTintList = ContextCompat.getColorStateList(requireActivity(), R.color.colorMyMsg)
                     }
@@ -333,7 +313,7 @@ class MessagesFragment : Fragment(), Logging {
                             binding.messageInputText.setText(newText)
                             binding.messageInputText.setSelection(newText.length)
                         } else {
-                            model.sendMessage(action.message, contactKey)
+                            model.sendMessage(action.message)
                         }
                     }
                     binding.quickChatLayout.addView(button)

app/src/main/java/com/geeksville/mesh/ui/UsersFragment.kt

@@ -15,10 +15,8 @@ import android.view.animation.LinearInterpolator
 import androidx.appcompat.widget.PopupMenu
 import androidx.core.animation.doOnEnd
 import androidx.core.content.ContextCompat
-import androidx.core.os.bundleOf
 import androidx.core.text.HtmlCompat
 import androidx.fragment.app.activityViewModels
-import androidx.fragment.app.setFragmentResult
 import androidx.lifecycle.asLiveData
 import androidx.lifecycle.lifecycleScope
 import androidx.recyclerview.widget.LinearLayoutManager
@@ -119,13 +117,7 @@ class UsersFragment : ScreenFragment("Users"), Logging {
                 when (item.itemId) {
                     R.id.direct_message -> {
                         debug("calling MessagesFragment filter: ${node.channel}${user.id}")
-                        setFragmentResult(
-                            "requestKey",
-                            bundleOf(
-                                "contactKey" to "${node.channel}${user.id}",
-                                "contactName" to user.longName
-                            )
-                        )
+                        model.setContactKey("${node.channel}${user.id}")
                         parentFragmentManager.beginTransaction()
                             .replace(R.id.mainActivityLayout, MessagesFragment())
                             .addToBackStack(null)

app/src/main/java/com/geeksville/mesh/ui/map/MapFragment.kt

@@ -31,9 +31,7 @@ import androidx.compose.ui.platform.LocalHapticFeedback
 import androidx.compose.ui.platform.ViewCompositionStrategy
 import androidx.compose.ui.unit.dp
 import androidx.compose.ui.viewinterop.AndroidView
-import androidx.core.os.bundleOf
 import androidx.fragment.app.activityViewModels
-import androidx.fragment.app.setFragmentResult
 import androidx.lifecycle.compose.collectAsStateWithLifecycle
 import androidx.lifecycle.viewmodel.compose.viewModel
 import com.geeksville.mesh.BuildConfig
@@ -115,13 +113,7 @@ class MapFragment : ScreenFragment("Map Fragment"), Logging {
 
     private fun openDirectMessage(node: NodeInfo) {
         val user = node.user ?: return
-        setFragmentResult(
-            "requestKey",
-            bundleOf(
-                "contactKey" to "${node.channel}${user.id}",
-                "contactName" to user.longName
-            )
-        )
+        model.setContactKey("${node.channel}${user.id}")
         parentFragmentManager.beginTransaction()
             .replace(R.id.mainActivityLayout, MessagesFragment())
             .addToBackStack(null)