Add sort lexicographical descendant order for notes

Author: Kokika

app/src/main/java/it/niedermann/owncloud/notes/main/MainActivity.java

@@ -292,11 +292,9 @@ protected void onCreate(Bundle savedInstanceState) {
             activityBinding.sortingMethod.setOnClickListener((v) -> {
                 if (methodOfCategory.first != null) {
                     var newMethod = methodOfCategory.second;
-                    if (newMethod == CategorySortingMethod.SORT_LEXICOGRAPHICAL_ASC) {
-                        newMethod = CategorySortingMethod.SORT_MODIFIED_DESC;
-                    } else {
-                        newMethod = CategorySortingMethod.SORT_LEXICOGRAPHICAL_ASC;
-                    }
+                    //Rotate for next method
+                    newMethod = CategorySortingMethod.findById(newMethod.getId() + 1);
+
                     final var modifyLiveData = mainViewModel.modifyCategoryOrder(methodOfCategory.first, newMethod);
                     modifyLiveData.observe(this, (next) -> modifyLiveData.removeObservers(this));
                 }

app/src/main/java/it/niedermann/owncloud/notes/main/MainViewModel.java

@@ -16,6 +16,7 @@
 import static it.niedermann.owncloud.notes.main.slots.SlotterUtil.fillListByInitials;
 import static it.niedermann.owncloud.notes.main.slots.SlotterUtil.fillListByTime;
 import static it.niedermann.owncloud.notes.shared.model.CategorySortingMethod.SORT_MODIFIED_DESC;
+import static it.niedermann.owncloud.notes.shared.model.CategorySortingMethod.SORT_LEXICOGRAPHICAL_ASC;
 import static it.niedermann.owncloud.notes.shared.model.ENavigationCategoryType.DEFAULT_CATEGORY;
 import static it.niedermann.owncloud.notes.shared.model.ENavigationCategoryType.FAVORITES;
 import static it.niedermann.owncloud.notes.shared.model.ENavigationCategoryType.RECENT;
@@ -282,9 +283,12 @@ private List<Item> fromNotes(List<Note> noteList, @NonNull NavigationCategory se
         }
         if (sortingMethod == SORT_MODIFIED_DESC) {
             return fillListByTime(getApplication(), noteList);
-        } else {
-            return fillListByInitials(getApplication(), noteList);
         }
+        List<Item> itemList = fillListByInitials(getApplication(), noteList);
+        if(sortingMethod != SORT_LEXICOGRAPHICAL_ASC){
+            Collections.reverse(itemList);
+        }
+        return itemList;
     }
 
     @NonNull

app/src/main/java/it/niedermann/owncloud/notes/shared/model/CategorySortingMethod.java

@@ -8,7 +8,8 @@
 
 public enum CategorySortingMethod {
     SORT_MODIFIED_DESC(0, "MODIFIED DESC"),
-    SORT_LEXICOGRAPHICAL_ASC(1, "TITLE COLLATE NOCASE ASC");
+    SORT_LEXICOGRAPHICAL_ASC(1, "TITLE COLLATE NOCASE ASC"),
+    SORT_LEXICOGRAPHICAL_DESC(2, "TITLE COLLATE NOCASE DESC");
 
     private final int id;
     private final String title;  // sorting method OrderBy for SQL
@@ -44,6 +45,12 @@ public String getTitle() {
      * @return the corresponding enum item with the index (ordinal)
      */
     public static CategorySortingMethod findById(int id) {
+        if (id < 0)
+            id += values().length;
+
+        if (id >= values().length)
+            id = id % values().length;
+
         for (final var csm : values()) {
             if (csm.getId() == id) {
                 return csm;