Make the home screen show all the notes

It can show call the notes recursively, instead of showing just the root
folder. This makes it much easier to access a note recently modified.

lib/core/flattened_notes_folder.dart

@@ -0,0 +1,105 @@
+import 'package:gitjournal/core/note.dart';
+import 'package:gitjournal/core/notes_folder.dart';
+import 'package:gitjournal/core/notes_folder_notifier.dart';
+
+class FlattenedNotesFolder
+    with NotesFolderNotifier
+    implements NotesFolderReadOnly {
+  final NotesFolder _parentFolder;
+
+  var _notes = <Note>[];
+  var _noteExtraInfo = <Note, int>{};
+
+  var _folders = <NotesFolderReadOnly>[];
+
+  FlattenedNotesFolder(this._parentFolder) {
+    _addFolder(_parentFolder);
+  }
+
+  void _addFolder(NotesFolderReadOnly folder) {
+    _folders.add(folder);
+
+    // Add Change notifiers
+    folder.addFolderAddedListener(_folderAdded);
+    folder.addFolderRemovedListener(_folderRemoved);
+
+    folder.addNoteAddedListener(_noteAdded);
+    folder.addNoteRemovedListener(_noteRemoved);
+    folder.addNoteModifiedListener(_noteModified);
+
+    // Add Individual Notes
+    for (var note in folder.notes) {
+      _noteAdded(-1, note);
+    }
+
+    // Add Sub-Folders
+    for (var folder in folder.subFolders) {
+      _addFolder(folder);
+    }
+  }
+
+  @override
+  void dispose() {
+    for (var folder in _folders) {
+      _folderRemoved(-1, folder);
+    }
+
+    super.dispose();
+  }
+
+  void _folderAdded(int _, NotesFolder folder) {
+    _addFolder(folder);
+  }
+
+  void _folderRemoved(int _, NotesFolder folder) {
+    folder.removeFolderAddedListener(_folderAdded);
+    folder.removeFolderRemovedListener(_folderRemoved);
+
+    folder.removeNoteAddedListener(_noteAdded);
+    folder.removeNoteRemovedListener(_noteRemoved);
+    folder.removeNoteModifiedListener(_noteModified);
+  }
+
+  void _noteAdded(int _, Note note) {
+    _notes.add(note);
+    _noteExtraInfo[note] = _notes.length - 1;
+
+    notifyNoteAdded(-1, note);
+  }
+
+  void _noteRemoved(int _, Note note) {
+    assert(_noteExtraInfo.containsKey(note));
+
+    var i = _noteExtraInfo[note];
+    _notes.removeAt(i);
+
+    notifyNoteRemoved(-1, note);
+  }
+
+  void _noteModified(int i, Note note) {
+    notifyNoteModified(-1, note);
+  }
+
+  @override
+  List<Note> get notes => _notes;
+
+  @override
+  List<NotesFolder> get subFolders => [];
+
+  @override
+  bool get hasNotes => _notes.isNotEmpty;
+
+  @override
+  bool get isEmpty => _notes.isEmpty;
+
+  @override
+  NotesFolder get parent => null;
+
+  @override
+  String pathSpec() => "";
+
+  @override
+  NotesFolder get fsFolder {
+    return _parentFolder;
+  }
+}

lib/core/notes_folder.dart

@@ -11,11 +11,17 @@ abstract class NotesFolderReadOnly implements NotesFolderNotifier {
   bool get isEmpty;
   bool get hasNotes;
   List<Note> get notes;
+  List<NotesFolder> get subFolders;
+  NotesFolderReadOnly get parent;
+  NotesFolder get fsFolder;
+
+  String pathSpec();
 }
 
 class NotesFolder
     with NotesFolderNotifier
     implements NotesFolderReadOnly, Comparable<NotesFolder> {
+  @override
   final NotesFolder parent;
   String _folderPath;
 
@@ -110,6 +116,7 @@ class NotesFolder
     return _notes;
   }
 
+  @override
   List<NotesFolder> get subFolders {
     // FIXME: This is really not ideal
     _folders.sort();
@@ -304,6 +311,7 @@ class NotesFolder
     notifyListeners();
   }
 
+  @override
   String pathSpec() {
     if (parent == null) {
       return "";
@@ -328,4 +336,9 @@ class NotesFolder
       }
     }
   }
+
+  @override
+  NotesFolder get fsFolder {
+    return this;
+  }
 }

lib/core/sorted_notes_folder.dart

@@ -9,7 +9,7 @@ import 'notes_folder_notifier.dart';
 class SortedNotesFolder
     with NotesFolderNotifier
     implements NotesFolderReadOnly {
-  final NotesFolder folder;
+  final NotesFolderReadOnly folder;
 
   SortingMode _sortingMode;
   NoteSortingFunction _sortFunc;
@@ -83,7 +83,7 @@ class SortedNotesFolder
     _notes.removeAt(i);
     _insertInCorrectPos(note);
 
-    notifyListeners();
+    notifyNoteModified(-1, note);
   }
 
   int _insertInCorrectPos(Note note) {
@@ -101,6 +101,9 @@ class SortedNotesFolder
   @override
   List<Note> get notes => _notes;
 
+  @override
+  List<NotesFolder> get subFolders => folder.subFolders;
+
   @override
   bool get hasNotes => folder.hasNotes;
 
@@ -117,4 +120,15 @@ class SortedNotesFolder
   }
 
   SortingMode get sortingMode => _sortingMode;
+
+  @override
+  NotesFolder get parent => folder.parent;
+
+  @override
+  String pathSpec() => folder.pathSpec();
+
+  @override
+  NotesFolder get fsFolder {
+    return folder;
+  }
 }

lib/core/virtual_notes_folder.dart

@@ -12,9 +12,23 @@ class VirtualNotesFolder
   @override
   List<Note> get notes => _notes;
 
+  @override
+  List<NotesFolder> get subFolders => [];
+
   @override
   bool get isEmpty => _notes.isEmpty;
 
   @override
   bool get hasNotes => _notes.isNotEmpty;
+
+  @override
+  NotesFolder get parent => null;
+
+  @override
+  String pathSpec() => "";
+
+  @override
+  NotesFolder get fsFolder {
+    return null;
+  }
 }

lib/screens/folder_view.dart

@@ -23,7 +23,7 @@ enum DropDownChoices {
 }
 
 class FolderView extends StatefulWidget {
-  final NotesFolder notesFolder;
+  final NotesFolderReadOnly notesFolder;
 
   FolderView({@required this.notesFolder});
 
@@ -173,7 +173,7 @@ class _FolderViewState extends State<FolderView> {
 
   void _newPost(BuildContext context) {
     var route = MaterialPageRoute(
-        builder: (context) => NoteEditor.newNote(widget.notesFolder));
+        builder: (context) => NoteEditor.newNote(widget.notesFolder.fsFolder));
     Navigator.of(context).push(route);
   }
 

lib/screens/home_screen.dart

@@ -1,14 +1,36 @@
 import 'package:flutter/material.dart';
+import 'package:gitjournal/core/flattened_notes_folder.dart';
 import 'package:provider/provider.dart';
 
 import 'package:gitjournal/core/notes_folder.dart';
 
 import 'folder_view.dart';
 
-class HomeScreen extends StatelessWidget {
+class HomeScreen extends StatefulWidget {
+  @override
+  _HomeScreenState createState() => _HomeScreenState();
+}
+
+class _HomeScreenState extends State<HomeScreen> {
+  FlattenedNotesFolder flattenedNotesFolder;
+
+  @override
+  void initState() {
+    super.initState();
+    Future.delayed(Duration.zero, () {
+      final rootFolder = Provider.of<NotesFolder>(context);
+      setState(() {
+        flattenedNotesFolder = FlattenedNotesFolder(rootFolder);
+      });
+    });
+  }
+
   @override
   Widget build(BuildContext context) {
-    final notesFolder = Provider.of<NotesFolder>(context);
-    return FolderView(notesFolder: notesFolder);
+    if (flattenedNotesFolder == null) {
+      return Container();
+    }
+
+    return FolderView(notesFolder: flattenedNotesFolder);
   }
 }