Implement note deletion

It looks quite ugly, but it works.

lib/app.dart

@@ -44,6 +44,7 @@ class JournalAppState extends State<JournalApp> {
       home: new HomeScreen(
         appState: appState,
         noteAdder: addNote,
+        noteRemover: removeNote,
       ),
       theme: new ThemeData(
         brightness: Brightness.dark,

lib/file_storage.dart

@@ -37,7 +37,8 @@ class FileStorage {
 
   Future<Directory> saveNotes(List<Note> notes) async {
     final dir = await getDirectory();
-    //await dir.delete(recursive: true);
+    await dir.delete(recursive: true);
+    await dir.create();
 
     for (var note in notes) {
       var filePath = p.join(dir.path, note.id);

lib/journal_list.dart

@@ -1,4 +1,5 @@
 import 'package:flutter/material.dart';
+import 'package:flutter/foundation.dart';
 import 'package:intl/intl.dart';
 
 import 'note.dart';
@@ -7,11 +8,16 @@ typedef void NoteSelectedFunction(Note note);
 
 class JournalList extends StatelessWidget {
   final NoteSelectedFunction noteSelectedFunction;
+  final NoteRemover noteRemover;
   final List<Note> notes;
 
   final _biggerFont = const TextStyle(fontSize: 18.0);
 
-  JournalList({this.noteSelectedFunction, this.notes});
+  JournalList({
+    @required this.notes,
+    @required this.noteSelectedFunction,
+    @required this.noteRemover,
+  });
 
   @override
   Widget build(BuildContext context) {
@@ -22,7 +28,20 @@ class JournalList extends StatelessWidget {
           return null;
         }
         //if (i.isOdd) return new Divider();
-        return _buildRow(context, notes[i]);
+
+        var note = notes[i];
+        return new Dismissible(
+          key: new Key(note.id),
+          child: _buildRow(context, note),
+          background: new Container(color: Colors.red),
+          onDismissed: (direction) {
+            noteRemover(note);
+
+            Scaffold
+                .of(context)
+                .showSnackBar(new SnackBar(content: new Text("Note deleted")));
+          },
+        );
       },
     );
   }

lib/screens/home_screen.dart

@@ -9,10 +9,12 @@ import 'package:journal/note_viewer.dart';
 class HomeScreen extends StatelessWidget {
   final AppState appState;
   final NoteAdder noteAdder;
+  final NoteRemover noteRemover;
 
   HomeScreen({
     @required this.appState,
     @required this.noteAdder,
+    @required this.noteRemover,
   });
 
   @override
@@ -47,6 +49,7 @@ class HomeScreen extends StatelessWidget {
       body: new JournalList(
         notes: appState.notes,
         noteSelectedFunction: (note) => _noteSelected(note, context),
+        noteRemover: noteRemover,
       ),
     );
   }