first steps

lib/main.dart

@@ -1,4 +1,6 @@
 import 'package:flutter/material.dart';
+import 'package:nextcloud_reminder/repeating_task.dart';
+import 'package:nextcloud_reminder/table.dart';
 
 void main() {
   runApp(const MyApp());
@@ -24,7 +26,7 @@ class MyApp extends StatelessWidget {
         // is not restarted.
         primarySwatch: Colors.blue,
       ),
-      home: const MyHomePage(title: 'Flutter Demo Home Page'),
+      home: const MyHomePage(title: 'todo.txt reminder'),
     );
   }
 }
@@ -48,16 +50,17 @@ class MyHomePage extends StatefulWidget {
 }
 
 class _MyHomePageState extends State<MyHomePage> {
-  int _counter = 0;
+  final ScrollTable _checkboxes = ScrollTable(title: "TODOs");
+  int _counter = 1;
 
-  void _incrementCounter() {
+  void _addDummyTask() {
     setState(() {
       // This call to setState tells the Flutter framework that something has
       // changed in this State, which causes it to rerun the build method below
       // so that the display can reflect the updated values. If we changed
-      // _counter without calling setState(), then the build method would not be
+      // stuff without calling setState(), then the build method would not be
       // called again, and so nothing would appear to happen.
-      _counter++;
+      _checkboxes.addTask(RepeatingTask(title: "Dummy Task #$_counter", begin: DateTime.now(), repeat: _counter++));
     });
   }
 
@@ -78,36 +81,11 @@ class _MyHomePageState extends State<MyHomePage> {
       body: Center(
         // Center is a layout widget. It takes a single child and positions it
         // in the middle of the parent.
-        child: Column(
-          // Column is also a layout widget. It takes a list of children and
-          // arranges them vertically. By default, it sizes itself to fit its
-          // children horizontally, and tries to be as tall as its parent.
-          //
-          // Invoke "debug painting" (press "p" in the console, choose the
-          // "Toggle Debug Paint" action from the Flutter Inspector in Android
-          // Studio, or the "Toggle Debug Paint" command in Visual Studio Code)
-          // to see the wireframe for each widget.
-          //
-          // Column has various properties to control how it sizes itself and
-          // how it positions its children. Here we use mainAxisAlignment to
-          // center the children vertically; the main axis here is the vertical
-          // axis because Columns are vertical (the cross axis would be
-          // horizontal).
-          mainAxisAlignment: MainAxisAlignment.center,
-          children: <Widget>[
-            const Text(
-              'You have pushed the button this many times:',
-            ),
-            Text(
-              '$_counter',
-              style: Theme.of(context).textTheme.headline4,
-            ),
-          ],
-        ),
+        child: _checkboxes,
       ),
       floatingActionButton: FloatingActionButton(
-        onPressed: _incrementCounter,
-        tooltip: 'Increment',
+        onPressed: _addDummyTask,
+        tooltip: 'add dummy Task',
         child: const Icon(Icons.add),
       ), // This trailing comma makes auto-formatting nicer for build methods.
     );

lib/repeating_task.dart

@@ -0,0 +1,35 @@
+import 'package:flutter/material.dart';
+import 'package:nextcloud_reminder/task_item.dart';
+
+class RepeatingTask extends StatefulWidget {
+  const RepeatingTask({super.key, required this.title, required this.begin, this.repeat=1});
+
+  final String title;
+  final DateTime begin;
+  final int repeat;
+
+  @override
+  State<StatefulWidget> createState() => _RepeatingTaskState();
+}
+
+class _RepeatingTaskState extends State<RepeatingTask> {
+  late List<TaskItem> _occurrences;
+  late DateTime _first_occurence;
+  late String _title;
+
+  @override
+  void initState() {
+    super.initState();
+    _title = widget.title;
+    _first_occurence = widget.begin;
+    _occurrences = List<TaskItem>.generate(10, (index) => TaskItem(done: index % widget.repeat == 0 ? false : null));
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Row(
+          crossAxisAlignment: CrossAxisAlignment.start,
+          children: _occurrences,
+        );
+  }
+}

lib/table.dart

@@ -0,0 +1,72 @@
+import 'package:flutter/material.dart';
+import 'package:nextcloud_reminder/repeating_task.dart';
+
+class ScrollTable extends StatefulWidget {
+  ScrollTable({super.key, required this.title});
+
+  // This class is the configuration for the state. It holds the values (in this
+  // case the title) provided by the parent (in this case the App widget) and
+  // used by the build method of the State. Fields in a Widget subclass are
+  // always marked "final".
+
+  final String title;
+  final _ScrollTableState _internalState = _ScrollTableState();
+
+  @override
+  State<ScrollTable> createState() => _internalState;
+
+
+  void addTask(RepeatingTask task) {
+    _internalState.addTask(task);
+  }
+
+}
+
+class _ScrollTableState extends State<ScrollTable> {
+  final List<RepeatingTask> _content = [];
+
+  addTask(RepeatingTask task) {
+    setState(() {
+      _content.add(task);
+    });
+  }
+
+  List<Widget> _buildTitles() {
+    return List<Widget>.from(_content.map((RepeatingTask t) =>
+        Container(
+          alignment: Alignment.center,
+          width: 120.0,
+          height: 60.0,
+          color: Colors.white,
+          margin: const EdgeInsets.all(4.0),
+          child: Text(t.title, style: Theme
+              .of(context)
+              .textTheme
+              .labelMedium),
+        )));
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return SingleChildScrollView(
+        child: Row(
+          crossAxisAlignment: CrossAxisAlignment.start,
+          children: <Widget>[
+            Column(
+              crossAxisAlignment: CrossAxisAlignment.start,
+              children: _buildTitles(),
+            ),
+            Flexible(
+              child: SingleChildScrollView(
+                scrollDirection: Axis.horizontal,
+                child: Column(
+                  crossAxisAlignment: CrossAxisAlignment.start,
+                  children: _content,
+                ),
+              ),
+            )
+          ],
+        )
+    );
+  }
+}

lib/task_item.dart

@@ -0,0 +1,36 @@
+import 'package:flutter/material.dart';
+
+class TaskItem extends StatefulWidget {
+
+  final bool? done;
+
+  const TaskItem({super.key, this.done});
+
+  @override
+  State<TaskItem> createState() => _TaskItemState();
+}
+
+class _TaskItemState extends State<TaskItem>{
+
+  bool? _done;
+
+  @override
+  void initState() {
+    super.initState();
+    _done = widget.done;
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Container(
+      alignment: Alignment.center,
+      width: 60.0,
+      height: 60.0,
+      color: Colors.white,
+      margin: const EdgeInsets.all(4.0),
+      child: _done == null ? null : Checkbox(value: _done, onChanged: (newState) => setState(() {
+        _done = newState!;
+      })),
+    );
+  }
+}