Disable encryption key setting if no identity key

The encryption key setting for the main device is now disabled if the identity key is not set. This prevents users from trying to set an encryption key for a device that doesn't have an identity key.

app/src/main/java/eu/darken/capod/main/ui/settings/general/GeneralSettingsFragment.kt

@@ -76,17 +76,18 @@ class GeneralSettingsFragment : PreferenceFragment3() {
     private fun String.fromHumanReadable(): ByteArray = split("-").map { it.toInt(16).toByte() }.toByteArray()
 
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
-        vm.bondedDevices.observe2 { devices ->
+        vm.state.observe2 { state ->
             mainDeviceAddressPref.setOnPreferenceClickListener {
                 val dialog = DeviceSelectionDialogFactory(requireContext()).create(
-                    devices,
-                    devices.firstOrNull { it.address == generalSettings.mainDeviceAddress.value }
+                    state.devices,
+                    state.devices.firstOrNull { it.address == generalSettings.mainDeviceAddress.value }
                 ) { selected ->
                     generalSettings.mainDeviceAddress.value = selected?.address
                 }
                 dialog.show()
                 true
             }
+            mainDeviceEncryptionKeyPref.isEnabled = state.hasIdentityKey
         }
 
         vm.events.observe2 {

app/src/main/java/eu/darken/capod/main/ui/settings/general/GeneralSettingsFragmentVM.kt

@@ -2,6 +2,7 @@ package eu.darken.capod.main.ui.settings.general
 
 import androidx.lifecycle.SavedStateHandle
 import dagger.hilt.android.lifecycle.HiltViewModel
+import eu.darken.capod.common.bluetooth.BluetoothDevice2
 import eu.darken.capod.common.bluetooth.BluetoothManager2
 import eu.darken.capod.common.coroutine.DispatcherProvider
 import eu.darken.capod.common.debug.logging.logTag
@@ -10,9 +11,10 @@ import eu.darken.capod.common.livedata.SingleLiveEvent
 import eu.darken.capod.common.uix.ViewModel3
 import eu.darken.capod.main.core.GeneralSettings
 import eu.darken.capod.main.core.MonitorMode
+import kotlinx.coroutines.flow.combine
 import kotlinx.coroutines.flow.filter
-import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.flow.onEach
+import kotlinx.coroutines.flow.onStart
 import javax.inject.Inject
 
 @HiltViewModel
@@ -23,10 +25,6 @@ class GeneralSettingsFragmentVM @Inject constructor(
     private val generalSettings: GeneralSettings,
 ) : ViewModel3(dispatcherProvider) {
 
-    val bondedDevices = bluetoothManager.bondedDevices()
-        .map { it.toList() }
-        .asLiveData2()
-
     val events = SingleLiveEvent<GeneralSettingsEvents>()
 
     init {
@@ -39,6 +37,21 @@ class GeneralSettingsFragmentVM @Inject constructor(
             .launchInViewModel()
     }
 
+    val state = combine(
+        bluetoothManager.bondedDevices().onStart { emit(emptySet()) },
+        generalSettings.mainDeviceIdentityKey.flow
+    ) { bondedDevices, identityKey ->
+        State(
+            devices = bondedDevices.toList(),
+            hasIdentityKey = identityKey != null
+        )
+    }.asLiveData2()
+
+    data class State(
+        val devices: List<BluetoothDevice2>,
+        val hasIdentityKey: Boolean
+    )
+
     companion object {
         private val TAG = logTag("Settings", "General", "VM")
     }

app/src/main/res/xml/preferences_general.xml

@@ -51,6 +51,7 @@
         <Preference
             android:icon="@drawable/ic_key_24"
             android:key="core.maindevice.encryptionkey"
+            app:enabled="false"
             android:summary="@string/settings_maindevice_encryptionkey_description"
             android:title="@string/settings_maindevice_encryptionkey_label" />
     </PreferenceCategory>