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lib/savesystem/note_file.dart

@@ -6,21 +6,25 @@ import 'package:sqflite/sqflite.dart';
 import 'path.dart';
 
 class NoteFile {
-  late Database _db;
+  Database? _db;
   String filename;
-  late String _basePath;
+  String? _basePath;
 
   String? _newFileName;
 
   Database db() {
-    return _db;
+    assert(_db != null);
+    return _db!;
   }
 
   NoteFile(this.filename);
 
   Future<void> init() async {
-    _basePath = (await getSavePath()).path;
-    final path = _basePath + Platform.pathSeparator + filename;
+    if (_basePath == null) {
+      await _initBasePath();
+    }
+
+    final path = _basePath! + Platform.pathSeparator + filename;
     _db = await openDatabase(
       path,
       onCreate: (db, version) async {
@@ -44,7 +48,11 @@ class NoteFile {
 
   Future<void> delete() async {
     await close();
-    await File(_basePath + Platform.pathSeparator + filename).delete();
+
+    if (_basePath == null) {
+      await _initBasePath();
+    }
+    await File(_basePath! + Platform.pathSeparator + filename).delete();
   }
 
   void rename(String newname) {
@@ -53,19 +61,27 @@ class NoteFile {
 
   Future<void> close() async {
     // shrink the db file size
-    if (_db.isOpen) {
-      await _db.execute('VACUUM');
-      await _db.close();
+    if (_db != null && _db!.isOpen) {
+      await _db!.execute('VACUUM');
+      await _db!.close();
     } else {
       debugPrint('db file unexpectedly closed before shrinking');
     }
 
+    if (_basePath == null) {
+      await _initBasePath();
+    }
+
     // perform qued file renaming operations
     if (_newFileName != null) {
-      File(_basePath + Platform.pathSeparator + filename)
-          .rename(_basePath + Platform.pathSeparator + _newFileName!);
+      File(_basePath! + Platform.pathSeparator + filename)
+          .rename(_basePath! + Platform.pathSeparator + _newFileName!);
       filename = _newFileName!;
       _newFileName = null;
     }
   }
+
+  Future<void> _initBasePath() async {
+    _basePath = (await getSavePath()).path;
+  }
 }