first visible item index feature prep.

Author: commandiron

app/src/main/java/com/commandiron/vacationchecklist/data/preferences/DefaultPreferences.kt

@@ -70,4 +70,17 @@ class DefaultPreferences(
             0.5f
         )
     }
+
+    override fun saveListFirstVisibleItemIndex(itemIndex: Int) {
+        sharedPref.edit()
+            .putInt(Preferences.KEY_SAVE_LOAD_LIST_FIRST_VISIBLE_ITEM_INDEX, itemIndex)
+            .apply()
+    }
+
+    override fun loadListFirstVisibleItemIndex(): Int {
+        return sharedPref.getInt(
+            Preferences.KEY_SAVE_LOAD_LIST_FIRST_VISIBLE_ITEM_INDEX,
+            0
+        )
+    }
 }

app/src/main/java/com/commandiron/vacationchecklist/domain/preferences/Preferences.kt

@@ -16,11 +16,15 @@ interface Preferences {
     fun saveSliderValue(sliderValue: Float)
     fun loadSliderValue(): Float
 
+    fun saveListFirstVisibleItemIndex(itemIndex: Int)
+    fun loadListFirstVisibleItemIndex(): Int
+
     companion object {
         const val KEY_SHOULD_SHOW_HOT_SPLASH = "should_show_hotSplash"
         const val KEY_SAVE_LOAD_ACTIVE_VACATION = "save_load_active_vacation"
         const val KEY_SHOULD_DOUBLE_CHECK = "should_double_check"
         const val KEY_SHOULD_SHOW_GRID_VIEW = "should_show_grid_view"
         const val KEY_SAVE_LOAD_SLIDER_VALUE = "save_load_slider_value"
+        const val KEY_SAVE_LOAD_LIST_FIRST_VISIBLE_ITEM_INDEX = "save_load_list_first_visible_item_index"
     }
 }

app/src/main/java/com/commandiron/vacationchecklist/presentation/checklist/ChecklistState.kt

@@ -8,6 +8,7 @@ data class ChecklistState(
     val checkItems: List<CheckItem>? = null,
     val checkedItem: CheckItem? = null,
     val markedItem: CheckItem? = null,
+    val firstVisibleItemIndex: Int = 0,
     val doubleCheckEnabled: Boolean = false,
     val isLoading: Boolean = false,
     val showCheckAlertDialog: Boolean = false,

app/src/main/java/com/commandiron/vacationchecklist/presentation/checklist/ChecklistUserEvent.kt

@@ -3,6 +3,7 @@ package com.commandiron.vacationchecklist.presentation.checklist
 import com.commandiron.vacationchecklist.domain.model.CheckItem
 
 sealed class ChecklistUserEvent{
+    data class OnScrollCompleted(val firstVisibleItemIndex: Int): ChecklistUserEvent()
     data class OnCheck(val checkedItem: CheckItem): ChecklistUserEvent()
     data class OnMark(val markedItem: CheckItem): ChecklistUserEvent()
 

app/src/main/java/com/commandiron/vacationchecklist/presentation/checklist/ChecklistViewModel.kt

@@ -35,6 +35,9 @@ class ChecklistViewModel @Inject constructor(
 
     fun onEvent(userEvent: ChecklistUserEvent) {
         when (userEvent) {
+            is ChecklistUserEvent.OnScrollCompleted -> {
+                preferences.saveListFirstVisibleItemIndex(userEvent.firstVisibleItemIndex)
+            }
             is ChecklistUserEvent.OnCheck -> {
                 if(!userEvent.checkedItem.isMarked){
                     if(state.doubleCheckEnabled){
@@ -145,6 +148,7 @@ class ChecklistViewModel @Inject constructor(
 
     private fun loadSettings() {
         state = state.copy(
+            firstVisibleItemIndex = preferences.loadListFirstVisibleItemIndex(),
             doubleCheckEnabled = preferences.loadShouldDoubleCheck(),
             gridViewEnabled = preferences.loadShouldShowGridView(),
             sliderValue = preferences.loadSliderValue()