Save the selected sorting mode

lib/core/sorted_notes_folder.dart

@@ -1,11 +1,10 @@
 import 'package:flutter/material.dart';
+import 'package:gitjournal/settings.dart';
 
 import 'note.dart';
 import 'notes_folder.dart';
 import 'notes_folder_notifier.dart';
 
-enum SortingMode { Modified, Created }
-
 class SortedNotesFolder
     with NotesFolderNotifier
     implements NotesFolderReadOnly {

lib/screens/journal_listing.dart

@@ -5,6 +5,7 @@ import 'package:gitjournal/core/note.dart';
 import 'package:gitjournal/core/notes_folder.dart';
 import 'package:gitjournal/core/sorted_notes_folder.dart';
 import 'package:gitjournal/screens/note_editor.dart';
+import 'package:gitjournal/settings.dart';
 import 'package:gitjournal/state_container.dart';
 import 'package:gitjournal/utils.dart';
 import 'package:gitjournal/widgets/app_drawer.dart';
@@ -30,7 +31,7 @@ class _JournalListingScreenState extends State<JournalListingScreen> {
     super.initState();
     sortedNotesFolder = SortedNotesFolder(
       folder: widget.notesFolder,
-      sortingMode: SortingMode.Modified,
+      sortingMode: Settings.instance.sortingMode,
     );
   }
 
@@ -150,8 +151,12 @@ class _JournalListingScreenState extends State<JournalListingScreen> {
       },
     );
 
-    setState(() {
-      sortedNotesFolder.changeSortingMode(newSortingMode);
-    });
+    if (newSortingMode != null) {
+      setState(() {
+        sortedNotesFolder.changeSortingMode(newSortingMode);
+        Settings.instance.sortingMode = newSortingMode;
+        Settings.instance.save();
+      });
+    }
   }
 }

lib/screens/settings_screen.dart

@@ -133,7 +133,7 @@ class SettingsListState extends State<SettingsList> {
           dynamicTheme.setBrightness(b);
         },
       ),
-      SettingsHeader('Note Settings'),
+      if (defaultFolderConfigurable) SettingsHeader('Note Settings'),
       if (defaultFolderConfigurable)
         ListTile(
           title: const Text("Default Folder for new notes"),

lib/settings.dart

@@ -21,6 +21,7 @@ class Settings {
   String defaultNewNoteFolder = "journal";
 
   RemoteSyncFrequency remoteSyncFrequency = RemoteSyncFrequency.Default;
+  SortingMode sortingMode = SortingMode.Default;
   int version = 0;
 
   void load(SharedPreferences pref) {
@@ -42,6 +43,8 @@ class Settings {
     remoteSyncFrequency = RemoteSyncFrequency.fromInternalString(
         pref.getString("remoteSyncFrequency"));
 
+    sortingMode = SortingMode.fromInternalString(pref.getString("sortingMode"));
+
     version = pref.getInt("settingsVersion") ?? version;
   }
 
@@ -56,6 +59,7 @@ class Settings {
     pref.setString("defaultNewNoteFolder", defaultNewNoteFolder);
     pref.setString(
         "remoteSyncFrequency", remoteSyncFrequency.toInternalString());
+    pref.setString("sortingMode", sortingMode.toInternalString());
     pref.setInt("settingsVersion", version);
 
     // Shouldn't we check if something has actually changed?
@@ -179,4 +183,57 @@ class RemoteSyncFrequency {
     }
     return Default;
   }
+
+  @override
+  String toString() {
+    assert(false, "RemoteSyncFrequency toString should never be called");
+    return "";
+  }
+}
+
+class SortingMode {
+  static const Modified = SortingMode("Last Modified", "Modified");
+  static const Created = SortingMode("Created", "Created");
+  static const Default = Modified;
+
+  final String _str;
+  final String _publicString;
+  const SortingMode(this._publicString, this._str);
+
+  String toInternalString() {
+    return _str;
+  }
+
+  String toPublicString() {
+    return _publicString;
+  }
+
+  static const options = <SortingMode>[
+    Modified,
+    Created,
+  ];
+
+  static SortingMode fromInternalString(String str) {
+    for (var opt in options) {
+      if (opt.toInternalString() == str) {
+        return opt;
+      }
+    }
+    return Default;
+  }
+
+  static SortingMode fromPublicString(String str) {
+    for (var opt in options) {
+      if (opt.toPublicString() == str) {
+        return opt;
+      }
+    }
+    return Default;
+  }
+
+  @override
+  String toString() {
+    assert(false, "SortingMode toString should never be called");
+    return "";
+  }
 }