Convert selected alarms to MutableStateFlow

app/src/main/java/com/todoroo/astrid/ui/RandomReminderControlSet.kt

@@ -43,13 +43,14 @@ internal class RandomReminderControlSet(context: Context, parentView: View, remi
             override fun onItemSelected(parent: AdapterView<*>?, view: View?, position: Int, id: Long) {
                 val newAlarm =
                     Alarm(vm.task?.id ?: 0, hours[position] * DateUtilities.ONE_HOUR, TYPE_RANDOM)
-                vm.selectedAlarms?.apply {
-                    find { it.type == TYPE_RANDOM }?.let {
-                        newAlarm.id = it.id
-                        remove(it)
+                vm.selectedAlarms.value =
+                    vm.selectedAlarms.value.toMutableList().apply {
+                        find { it.type == TYPE_RANDOM }?.let {
+                            newAlarm.id = it.id
+                            remove(it)
+                        }
+                        add(newAlarm)
                     }
-                    add(newAlarm)
-                }
             }
 
             override fun onNothingSelected(parent: AdapterView<*>?) {}

app/src/main/java/com/todoroo/astrid/ui/ReminderControlSet.kt

@@ -70,7 +70,7 @@ class ReminderControlSet : TaskEditControlFragment() {
             viewModel.ringFiveTimes!! -> setRingMode(1)
             else -> setRingMode(0)
         }
-        viewModel.selectedAlarms?.forEach(this::addAlarmRow)
+        viewModel.selectedAlarms.value.forEach(this::addAlarmRow)
     }
 
     override fun onSaveInstanceState(outState: Bundle) {
@@ -217,9 +217,9 @@ class ReminderControlSet : TaskEditControlFragment() {
         if (requestCode == REQUEST_NEW_ALARM) {
             if (resultCode == Activity.RESULT_OK) {
                 val timestamp = data!!.getLongExtra(MyTimePickerDialog.EXTRA_TIMESTAMP, 0L)
-                if (viewModel.selectedAlarms?.any { it.type == TYPE_DATE_TIME && timestamp == it.time } == false) {
+                if (viewModel.selectedAlarms.value.none { it.type == TYPE_DATE_TIME && timestamp == it.time }) {
                     val alarm = Alarm(viewModel.task?.id ?: 0, timestamp, TYPE_DATE_TIME)
-                    viewModel.selectedAlarms?.add(alarm)
+                    viewModel.selectedAlarms.value = viewModel.selectedAlarms.value.plus(alarm)
                     addAlarmRow(alarm)
                 }
             }
@@ -231,15 +231,12 @@ class ReminderControlSet : TaskEditControlFragment() {
     private fun addAlarmRow(alarm: Alarm) {
         val alarmRow = addAlarmRow(alarm) {
             if (alarm.type == TYPE_RANDOM) {
-                viewModel.selectedAlarms?.removeIf { it.type == TYPE_RANDOM }
+                viewModel.selectedAlarms.value =
+                    viewModel.selectedAlarms.value.filterNot { it.type == TYPE_RANDOM }
                 randomControlSet = null
             } else {
-                viewModel.selectedAlarms?.removeIf {
-                    it.type == alarm.type &&
-                            it.time == alarm.time &&
-                            it.repeat == alarm.repeat &&
-                            it.interval == alarm.interval
-                }
+                viewModel.selectedAlarms.value =
+                    viewModel.selectedAlarms.value.filterNot { it.same(alarm) }
             }
         }
         if (alarm.type == TYPE_RANDOM) {
@@ -267,7 +264,7 @@ class ReminderControlSet : TaskEditControlFragment() {
 
     private fun addAlarmRow(alertItem: View, alarm: Alarm, onRemove: View.OnClickListener?) {
         val display = alertItem.findViewById<TextView>(R.id.alarm_string)
-        viewModel.selectedAlarms?.add(alarm)
+        viewModel.selectedAlarms.value = viewModel.selectedAlarms.value.plus(alarm)
         display.text = alarmToString.toString(alarm)
         alertItem
                 .findViewById<View>(R.id.clear)
@@ -280,13 +277,13 @@ class ReminderControlSet : TaskEditControlFragment() {
     private val options: List<String>
         get() {
             val options: MutableList<String> = ArrayList()
-            if (viewModel.selectedAlarms?.find { it.type == TYPE_REL_START && it.time == 0L } == null) {
+            if (viewModel.selectedAlarms.value.find { it.type == TYPE_REL_START && it.time == 0L } == null) {
                 options.add(getString(R.string.when_started))
             }
-            if (viewModel.selectedAlarms?.find { it.type == TYPE_REL_END && it.time == 0L } == null) {
+            if (viewModel.selectedAlarms.value.find { it.type == TYPE_REL_END && it.time == 0L } == null) {
                 options.add(getString(R.string.when_due))
             }
-            if (viewModel.selectedAlarms?.find { it.type == TYPE_REL_END && it.time == TimeUnit.HOURS.toMillis(24) } == null) {
+            if (viewModel.selectedAlarms.value.find { it.type == TYPE_REL_END && it.time == TimeUnit.HOURS.toMillis(24) } == null) {
                 options.add(getString(R.string.when_overdue))
             }
             if (randomControlSet == null) {

app/src/main/java/org/tasks/ui/TaskEditViewModel.kt

@@ -26,10 +26,9 @@ import com.todoroo.astrid.timers.TimerPlugin
 import dagger.hilt.android.lifecycle.HiltViewModel
 import dagger.hilt.android.qualifiers.ApplicationContext
 import kotlinx.collections.immutable.ImmutableList
-import kotlinx.collections.immutable.ImmutableSet
 import kotlinx.collections.immutable.toImmutableList
-import kotlinx.collections.immutable.toImmutableSet
 import kotlinx.coroutines.NonCancellable
+import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.runBlocking
 import net.fortuna.ical4j.model.Recur
 import org.tasks.Event
@@ -117,7 +116,7 @@ class TaskEditViewModel @Inject constructor(
                 }
             } else {
                 alarms
-            }.toImmutableSet()
+            }
         if (isNew && permissionChecker.canAccessCalendars()) {
             originalCalendar = preferences.defaultCalendar
         }
@@ -266,13 +265,13 @@ class TaskEditViewModel @Inject constructor(
 
     var newSubtasks = ArrayList<Task>()
 
-    var originalAlarms: ImmutableSet<Alarm>? = null
+    private var originalAlarms = emptyList<Alarm>()
         private set(value) {
             field = value
-            selectedAlarms = value?.let { HashSet(it) }
+            selectedAlarms.value = value
         }
 
-    var selectedAlarms: HashSet<Alarm>? = null
+    var selectedAlarms = MutableStateFlow(emptyList<Alarm>())
 
     var ringNonstop: Boolean? = null
         get() = field ?: task?.isNotifyModeNonstop
@@ -319,7 +318,7 @@ class TaskEditViewModel @Inject constructor(
                 originalTags?.toHashSet() != selectedTags?.toHashSet() ||
                 newSubtasks.isNotEmpty() ||
                 it.ringFlags != getRingFlags() ||
-                originalAlarms != selectedAlarms
+                originalAlarms.toHashSet() != selectedAlarms.value.toHashSet()
     } ?: false
 
     fun cleared() = cleared.value?.value == true
@@ -412,19 +411,19 @@ class TaskEditViewModel @Inject constructor(
         }
 
         if (!it.hasStartDate()) {
-            selectedAlarms?.removeIf { a -> a.type == TYPE_REL_START }
+            selectedAlarms.value = selectedAlarms.value.filterNot { a -> a.type == TYPE_REL_START }
         }
         if (!it.hasDueDate()) {
-            selectedAlarms?.removeIf { a -> a.type == TYPE_REL_END }
+            selectedAlarms.value = selectedAlarms.value.filterNot { a -> a.type == TYPE_REL_END }
         }
 
         taskDao.save(it, null)
 
         if (
-            selectedAlarms != originalAlarms ||
-            (isNew && selectedAlarms?.isNotEmpty() == true)
+            selectedAlarms.value.toHashSet() != originalAlarms.toHashSet() ||
+            (isNew && selectedAlarms.value.isNotEmpty())
         ) {
-            alarmService.synchronizeAlarms(it.id, selectedAlarms!!)
+            alarmService.synchronizeAlarms(it.id, selectedAlarms.value.toMutableSet())
             it.putTransitory(SyncFlags.FORCE_CALDAV_SYNC, true)
             it.modificationDate = now()
         }