added option to save default list and add to it from the start screen

lib/pages/home.dart

@@ -7,7 +7,7 @@ import 'package:vikunja_app/components/AddDialog.dart';
 import 'package:vikunja_app/components/ErrorDialog.dart';
 import 'package:vikunja_app/pages/namespace/namespace.dart';
 import 'package:vikunja_app/pages/namespace/namespace_edit.dart';
-import 'package:vikunja_app/pages/placeholder.dart';
+import 'package:vikunja_app/pages/landing_page.dart';
 import 'package:vikunja_app/global.dart';
 import 'package:vikunja_app/models/namespace.dart';
 import 'package:vikunja_app/pages/settings.dart';
@@ -97,7 +97,7 @@ class HomePageState extends State<HomePage> with AfterLayoutMixin<HomePage> {
       ),
       drawer: new Drawer(
           child: new Column(children: <Widget>[
-        new UserAccountsDrawerHeader(
+            new UserAccountsDrawerHeader(
           accountEmail:
               currentUser?.email == null ? null : Text(currentUser.email),
           accountName:
@@ -125,6 +125,18 @@ class HomePageState extends State<HomePage> with AfterLayoutMixin<HomePage> {
                 child: _showUserDetails
                     ? _userDetailsWidget(context)
                     : _namespacesWidget())),
+            new Align(
+              alignment: FractionalOffset.bottomLeft,
+              child: Builder(
+                builder: (context) => ListTile(
+                  leading: Icon(Icons.house),
+                  onTap: () {
+                    Navigator.of(context).pop();
+                    setState(() => _selectedDrawerIndex = -1);
+                  },
+                ),
+              ),
+            ),
         new Align(
           alignment: FractionalOffset.bottomCenter,
           child: Builder(
@@ -142,7 +154,7 @@ class HomePageState extends State<HomePage> with AfterLayoutMixin<HomePage> {
 
   _getDrawerItemWidget(int pos) {
     if (pos == -1) {
-      return new PlaceholderPage();
+      return new LandingPage();
     }
     return new NamespacePage(namespace: _namespaces[pos]);
   }

lib/pages/landing_page.dart

@@ -0,0 +1,74 @@
+import 'package:flutter/material.dart';
+import 'package:vikunja_app/global.dart';
+
+import '../components/AddDialog.dart';
+import '../models/task.dart';
+
+class LandingPage extends StatefulWidget {
+  @override
+  State<StatefulWidget> createState() => LandingPageState();
+
+}
+
+class LandingPageState extends State<LandingPage> {
+  int defaultList;
+  @override
+  Widget build(BuildContext context) {
+    VikunjaGlobal.of(context).listService.getDefaultList().then((value) => setState(() => defaultList = value == null ? null : int.tryParse(value)));
+    return new Scaffold(
+      body: Container(
+        padding: EdgeInsets.only(left: 16.0),
+        child: new Column(
+          mainAxisAlignment: MainAxisAlignment.start,
+          children: <Widget>[
+            new Container(
+              padding: EdgeInsets.only(top: 32.0),
+              child: new Text(
+                'Welcome to Vikunja',
+                style: Theme.of(context).textTheme.headline4,
+              ),
+            ),
+            new Text('Please select a namespace by tapping the  ☰  icon.',
+                style: Theme.of(context).textTheme.subtitle1),
+          ],
+        )
+    ),
+        floatingActionButton: Builder(
+            builder: (context) =>
+                defaultList == null ?
+                FloatingActionButton(
+                    backgroundColor: Colors.grey,
+                    onPressed: () {
+                      ScaffoldMessenger.of(context).showSnackBar(SnackBar(
+                      content: Text('Please select a default list in the settings'),
+                    ));},
+                    child: const Icon(Icons.add))
+                    :
+                    FloatingActionButton(
+                      onPressed: () {
+                        _addItemDialog(context);
+                      },
+                      child: const Icon(Icons.add),
+                    ),
+        ));
+  }
+  _addItemDialog(BuildContext context) {
+    showDialog(
+        context: context,
+        builder: (_) => AddDialog(
+            onAdd: (name) => _addItem(name, context),
+            decoration: new InputDecoration(
+                labelText: 'Task Name', hintText: 'eg. Milk')));
+  }
+
+  _addItem(String name, BuildContext context) {
+    var globalState = VikunjaGlobal.of(context);
+    var newTask = Task(
+        id: null, title: name, owner: globalState.currentUser, done: false, loading: true);
+    globalState.taskService.add(defaultList, newTask).then((_) {
+        ScaffoldMessenger.of(context).showSnackBar(SnackBar(
+          content: Text('The task was added successfully!'),
+        ));
+    });
+  }
+}

lib/pages/placeholder.dart

@@ -1,23 +0,0 @@
-import 'package:flutter/material.dart';
-
-class PlaceholderPage extends StatelessWidget {
-  @override
-  Widget build(BuildContext context) {
-    return new Container(
-        padding: EdgeInsets.only(left: 16.0),
-        child: new Column(
-          mainAxisAlignment: MainAxisAlignment.start,
-          children: <Widget>[
-            new Container(
-              padding: EdgeInsets.only(top: 32.0),
-              child: new Text(
-                'Welcome to Vikunja',
-                style: Theme.of(context).textTheme.headline4,
-              ),
-            ),
-            new Text('Please select a namespace by tapping the  ☰  icon.',
-                style: Theme.of(context).textTheme.subtitle1),
-          ],
-        ));
-  }
-}

lib/service/mocked_services.dart

@@ -126,6 +126,17 @@ class MockedListService implements ListService {
   void setDisplayDoneTasks(int listId, String value) {
     // TODO: implement setDisplayDoneTasks
   }
+
+  @override
+  Future<String> getDefaultList() {
+    // TODO: implement getDefaultList
+    throw UnimplementedError();
+  }
+
+  @override
+  void setDefaultList(int listId) {
+    // TODO: implement setDefaultList
+  }
 }
 
 class MockedTaskService implements TaskService {