ShowHabitPresenter: Listen to commands and auto-update

android/uhabits-android/src/main/java/org/isoron/uhabits/activities/habits/show/ShowHabitActivity.kt

@@ -26,4 +26,14 @@ class ShowHabitActivity : HabitsActivity() {
         super.onCreate(savedInstanceState)
         setScreen(component.showHabitScreen)
     }
+
+    override fun onResume() {
+        super.onResume()
+        component.showHabitPresenter.onResume()
+    }
+
+    override fun onPause() {
+        component.showHabitPresenter.onPause()
+        super.onPause()
+    }
 }

android/uhabits-android/src/main/java/org/isoron/uhabits/activities/habits/show/ShowHabitPresenter.kt

@@ -20,6 +20,7 @@
 package org.isoron.uhabits.activities.habits.show
 
 import org.isoron.androidbase.activities.*
+import org.isoron.uhabits.core.commands.*
 import org.isoron.uhabits.core.models.*
 import org.isoron.uhabits.core.utils.*
 import javax.inject.*
@@ -28,10 +29,44 @@ import javax.inject.*
 class ShowHabitPresenter
 @Inject constructor(
         val habit: Habit,
-) {
+        val commandRunner: CommandRunner,
+) : CommandRunner.Listener {
+
     private val listeners = mutableListOf<Listener>()
+    private var data = ShowHabitViewModel()
+
+    fun onResume() {
+        commandRunner.addListener(this)
+        refresh()
+        notifyListeners()
+    }
+
+    fun onPause() {
+        commandRunner.removeListener(this)
+    }
+
+    fun addListener(listener: Listener) {
+        listeners.add(listener)
+    }
+
+    fun removeListener(listener: Listener) {
+        listeners.remove(listener)
+    }
+
+    fun requestData(listener: Listener) {
+        listener.onData(data)
+    }
 
-    private fun build(): ShowHabitViewModel {
+    override fun onCommandExecuted(command: Command?, refreshKey: Long?) {
+        refresh()
+        notifyListeners()
+    }
+
+    private fun notifyListeners() {
+        for (l in listeners) l.onData(data)
+    }
+
+    private fun refresh() {
         val scores = habit.scores
         val today = DateUtils.getTodayWithOffset()
         val lastMonth = today.minus(30)
@@ -39,7 +74,7 @@ class ShowHabitPresenter
         val scoreToday = scores.todayValue.toFloat()
         val scoreLastMonth = scores.getValue(lastMonth).toFloat()
         val scoreLastYear = scores.getValue(lastYear).toFloat()
-        return ShowHabitViewModel(
+        data = ShowHabitViewModel(
                 title = habit.name,
                 color = habit.color,
                 isNumerical = habit.isNumerical,
@@ -50,18 +85,6 @@ class ShowHabitPresenter
         )
     }
 
-    fun addListener(listener: Listener) {
-        listeners.add(listener)
-    }
-
-    fun removeListener(listener: Listener) {
-        listeners.remove(listener)
-    }
-
-    fun requestData(listener: Listener) {
-        listener.onData(build())
-    }
-
     interface Listener {
         fun onData(data: ShowHabitViewModel)
     }