NoteViewer: Implement the left/right buttons works

lib/note_viewer.dart

@@ -1,17 +1,70 @@
+import 'package:flutter/foundation.dart';
 import 'package:flutter/material.dart';
 import 'package:intl/intl.dart';
 
 import 'note.dart';
 
-class NoteViewer extends StatelessWidget {
-  final Note note;
-  final _biggerFont = const TextStyle(fontSize: 18.0);
+class NoteBrowsingScreen extends StatefulWidget {
+  final List<Note> notes;
+  final int noteIndex;
 
-  const NoteViewer({this.note});
+  const NoteBrowsingScreen({
+    @required this.notes,
+    @required this.noteIndex,
+  });
+
+  @override
+  NoteBrowsingScreenState createState() {
+    return new NoteBrowsingScreenState(noteIndex: noteIndex);
+  }
+}
+
+class NoteBrowsingScreenState extends State<NoteBrowsingScreen> {
+  int noteIndex;
+
+  NoteBrowsingScreenState({@required this.noteIndex});
 
   @override
   Widget build(BuildContext context) {
-    var bodyWidget = new SingleChildScrollView(
+    var viewer = new NoteViewer(
+      note: widget.notes[noteIndex],
+      showNextNoteFunc: () {
+        setState(() {
+          if (noteIndex < widget.notes.length - 1) noteIndex += 1;
+        });
+      },
+      showPrevNoteFunc: () {
+        setState(() {
+          if (noteIndex > 0) noteIndex -= 1;
+        });
+      },
+    );
+
+    return new Scaffold(
+      appBar: new AppBar(
+        title: new Text('TIMELINE'),
+      ),
+      body: viewer,
+    );
+  }
+}
+
+class NoteViewer extends StatelessWidget {
+  final Note note;
+  final VoidCallback showNextNoteFunc;
+  final VoidCallback showPrevNoteFunc;
+
+  final _biggerFont = const TextStyle(fontSize: 18.0);
+
+  const NoteViewer({
+    @required this.note,
+    @required this.showNextNoteFunc,
+    @required this.showPrevNoteFunc,
+  });
+
+  @override
+  Widget build(BuildContext context) {
+    return new SingleChildScrollView(
       child: new Column(
         children: <Widget>[
           _buildHeader(context),
@@ -22,13 +75,6 @@ class NoteViewer extends StatelessWidget {
       ),
       padding: const EdgeInsets.all(16.0),
     );
-
-    return new Scaffold(
-      appBar: new AppBar(
-        title: new Text('TIMELINE'),
-      ),
-      body: bodyWidget,
-    );
   }
 
   Widget _buildHeader(BuildContext context) {
@@ -80,7 +126,7 @@ class NoteViewer extends StatelessWidget {
           new IconButton(
             icon: new Icon(Icons.arrow_left),
             tooltip: 'Previous Entry',
-            onPressed: () {},
+            onPressed: showPrevNoteFunc,
           ),
           new Expanded(
             flex: 10,
@@ -89,7 +135,7 @@ class NoteViewer extends StatelessWidget {
           new IconButton(
             icon: new Icon(Icons.arrow_right),
             tooltip: 'Next Entry',
-            onPressed: () {},
+            onPressed: showNextNoteFunc,
           ),
         ],
       ),

lib/screens/home_screen.dart

@@ -1,9 +1,7 @@
 import 'package:flutter/material.dart';
-import 'package:flutter/foundation.dart';
 
 import 'package:journal/state_container.dart';
 import 'package:journal/widgets/journal_list.dart';
-import 'package:journal/note.dart';
 import 'package:journal/note_editor.dart';
 import 'package:journal/note_viewer.dart';
 
@@ -23,36 +21,21 @@ class HomeScreen extends StatelessWidget {
         title: new Text('Journal'),
       ),
       floatingActionButton: createButton,
-      /*
-      body: new FutureBuilder<List<Note>>(
-          future: fetchNotes(),
-          builder: (context, snapshot) {
-            if (snapshot.hasData) {
-              var notes = snapshot.data;
-              return new JournalList(
-                notes: notes,
-                noteSelectedFunction: (note) => _noteSelected(note, context),
-              );
-            } else if (snapshot.hasError) {
-              return new Text("${snapshot.error}");
-            }
-
-            return new CircularProgressIndicator();
-          }),
-      */
       body: new JournalList(
         notes: appState.notes,
-        noteSelectedFunction: (note) => _noteSelected(note, context),
+        noteSelectedFunction: (noteIndex) {
+          var route = new MaterialPageRoute(
+            builder: (context) => new NoteBrowsingScreen(
+                  notes: appState.notes,
+                  noteIndex: noteIndex,
+                ),
+          );
+          Navigator.of(context).push(route);
+        },
       ),
     );
   }
 
-  void _noteSelected(Note note, BuildContext context) {
-    var route =
-        new MaterialPageRoute(builder: (context) => new NoteViewer(note: note));
-    Navigator.of(context).push(route);
-  }
-
   void _newPost(BuildContext context) {
     var route = new MaterialPageRoute(builder: (context) => new NoteEditor());
     Navigator.of(context).push(route);

lib/widgets/journal_list.dart

@@ -5,7 +5,7 @@ import 'package:intl/intl.dart';
 import 'package:journal/note.dart';
 import 'package:journal/state_container.dart';
 
-typedef void NoteSelectedFunction(Note note);
+typedef void NoteSelectedFunction(int noteIndex);
 
 class JournalList extends StatelessWidget {
   final NoteSelectedFunction noteSelectedFunction;
@@ -33,7 +33,7 @@ class JournalList extends StatelessWidget {
         var note = notes[i];
         return new Dismissible(
           key: new Key(note.id),
-          child: _buildRow(context, note),
+          child: _buildRow(context, note, i),
           background: new Container(color: Colors.red),
           onDismissed: (direction) {
             container.removeNote(note);
@@ -47,7 +47,7 @@ class JournalList extends StatelessWidget {
     );
   }
 
-  Widget _buildRow(BuildContext context, Note journal) {
+  Widget _buildRow(BuildContext context, Note journal, int noteIndex) {
     var formatter = new DateFormat('dd MMM, yyyy');
     var title = formatter.format(journal.createdAt);
 
@@ -67,7 +67,7 @@ class JournalList extends StatelessWidget {
         style: _biggerFont,
       ),
       subtitle: new Text(time + "\n" + body),
-      onTap: () => noteSelectedFunction(journal),
+      onTap: () => noteSelectedFunction(noteIndex),
     );
   }
 }