Using passes screen as a startDestination

app/src/main/java/com/rtbishop/look4sat/ui/SharedViewModel.kt

@@ -41,13 +41,13 @@ class SharedViewModel @Inject constructor(
     
     private val _passes = MutableLiveData<Result<MutableList<SatPass>>>()
     private val _appEvent = MutableLiveData<Event<Int>>()
-    private var shouldTriggerCalculation = true
     
     init {
         if (prefsRepo.isFirstLaunch()) {
             updateDefaultSourcesAndEntries()
             prefsRepo.setFirstLaunchDone()
         }
+        calculatePasses()
     }
     
     fun getAppEvent(): LiveData<Event<Int>> = _appEvent
@@ -64,15 +64,7 @@ class SharedViewModel @Inject constructor(
     fun getTransmittersForSat(satId: Int) =
         satelliteRepo.getTransmittersForSat(satId).asLiveData()
     
-    fun triggerCalculation() {
-        if (shouldTriggerCalculation) {
-            shouldTriggerCalculation = false
-            calculatePasses()
-        }
-    }
-    
     fun calculatePasses(dateNow: Date = Date(System.currentTimeMillis())) {
-        shouldTriggerCalculation = false
         _passes.value = Result.InProgress
         viewModelScope.launch(Dispatchers.Default) {
             val passes = mutableListOf<SatPass>()

app/src/main/java/com/rtbishop/look4sat/ui/entriesScreen/EntriesFragment.kt

@@ -51,7 +51,7 @@ class EntriesFragment : Fragment(R.layout.fragment_entries) {
         super.onViewCreated(view, savedInstanceState)
         binding = FragmentEntriesBinding.bind(view)
         setupComponents()
-        observeEntries()
+        setupObservers()
     }
     
     private fun setupComponents() {
@@ -71,8 +71,8 @@ class EntriesFragment : Fragment(R.layout.fragment_entries) {
             searchBar.clearFocus()
         }
     }
-
+    
-    private fun observeEntries() {
+    private fun setupObservers() {
         setLoading()
         viewModel.getSatItems().observe(viewLifecycleOwner, { satItems ->
             if (satItems.isNullOrEmpty()) setError()
@@ -80,18 +80,20 @@ class EntriesFragment : Fragment(R.layout.fragment_entries) {
                 entriesAdapter?.setItems(satItems)
                 setLoaded()
             }
-            observeEvents()
         })
-    }
-
-    private fun observeEvents() {
         viewModel.getAppEvent().observe(viewLifecycleOwner, { event ->
-            event.getContentIfNotHandled()?.let {
+            event.getContentIfNotHandled()?.let { content ->
-                if (it == 0) setLoading()
+                if (content == 0) setLoading()
-                else if (it == 1) {
+                else if (content == 1) {
                     val errorMsg = getString(R.string.entries_update_error)
                     Snackbar.make(requireView(), errorMsg, Snackbar.LENGTH_SHORT).show()
-                    setError()
+                    entriesAdapter?.let { adapter ->
+                        if (adapter.getItems().isEmpty()) {
+                            setError()
+                        } else {
+                            setLoaded()
+                        }
+                    }
                 }
             }
         })

app/src/main/java/com/rtbishop/look4sat/ui/passesScreen/PassesFragment.kt

@@ -102,7 +102,6 @@ class PassesFragment : Fragment(R.layout.fragment_passes) {
             }
             passesFab.setOnClickListener { viewModel.calculatePasses() }
         }
-        viewModel.triggerCalculation()
     }
 
     private fun tickMainTimer(timeNow: Long) {

app/src/main/res/navigation/nav_graph.xml

@@ -3,7 +3,7 @@
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     android:id="@+id/mobile_navigation"
-    app:startDestination="@id/nav_entries">
+    app:startDestination="@id/nav_passes">
 
     <fragment
         android:id="@+id/nav_entries"