delete checklists

lib/pages/dashboard_page.dart

@@ -7,6 +7,7 @@ import 'package:provider/provider.dart';
 
 class DashboardPage extends StatefulWidget {
   const DashboardPage({super.key});
+
   static const routeName = '/dashboard';
 
   @override
@@ -15,40 +16,29 @@ class DashboardPage extends StatefulWidget {
 
 class _DashboardPageState extends State<DashboardPage> {
   final Future<List<Checklist>> checklistFuture = DbHelper.fetchChecklist;
+  late List<Checklist> checklists;
   late ChecklistProvider checklistProvider;
 
-  @override
-  void initState() {
-    super.initState();
-  }
+  int? _selectedChecklistIndex;
 
-  @override
-  Widget build(BuildContext context) {
-    checklistProvider = Provider.of<ChecklistProvider>(context, listen: true);
-    return Scaffold(
-      appBar: AppBar(
-        title: const Text('Brießenchecker9000'),
-        actions: [
-          IconButton(
-            onPressed: () => DbHelper.logout(),
-            icon: const Icon(Icons.logout),
-          )
-        ],
-      ),
-      body: FutureBuilder(
-        future: checklistFuture,
-        builder: _futureBuilder,
-      ),
-      floatingActionButton: FloatingActionButton(
+  FloatingActionButton get _fabBuilder {
+    if (_selectedChecklistIndex == null) {
+      return FloatingActionButton(
         onPressed: _onAddTapped,
         child: const Icon(Icons.add),
-      ),
+      );
+    }
+    return FloatingActionButton(
+      onPressed: _onDeleteTapped,
+      backgroundColor: Theme.of(context).colorScheme.error,
+      child: Icon(Icons.delete, color: Theme.of(context).colorScheme.onError),
     );
   }
 
   Widget _futureBuilder(
       BuildContext context, AsyncSnapshot<List<Checklist>> snapshot) {
     if (snapshot.hasData) {
+      checklists = snapshot.data!;
       return ListView.builder(
         itemCount: snapshot.data!.length,
         itemBuilder: (context, index) =>
@@ -66,7 +56,9 @@ class _DashboardPageState extends State<DashboardPage> {
     return ListTile(
       title: Text(cl.title == '' ? 'Unnamed ${cl.id}' : cl.title),
       subtitle: Text(cl.description),
-      onTap: () => _onListEntryTapped(cl),
+      onTap: () => _onListEntryTapped(cl, index),
+      onLongPress: () => _onLongPress(index),
+      selected: _selectedChecklistIndex == index,
     );
   }
 
@@ -77,8 +69,45 @@ class _DashboardPageState extends State<DashboardPage> {
         () => Navigator.of(context).pushNamed(DetailChecklistPage.routeName));
   }
 
-  void _onListEntryTapped(Checklist cl) {
-    checklistProvider.updateSelectedChecklist(cl.id, silent: true);
-    Navigator.of(context).pushNamed(DetailChecklistPage.routeName);
+  void _onListEntryTapped(Checklist cl, int index) {
+    if (_selectedChecklistIndex == index) {
+      setState(() => _selectedChecklistIndex = null);
+    } else if (_selectedChecklistIndex != null) {
+      setState(() => _selectedChecklistIndex = index);
+    } else {
+      checklistProvider.updateSelectedChecklist(cl.id, silent: true);
+      Navigator.of(context).pushNamed(DetailChecklistPage.routeName);
+    }
+  }
+
+  void _onLongPress(int index) {
+    setState(() {
+      _selectedChecklistIndex = index;
+    });
+  }
+
+  void _onDeleteTapped() {
+    DbHelper.deleteChecklistByid(
+        checklists.elementAt(_selectedChecklistIndex!).id);
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    checklistProvider = Provider.of<ChecklistProvider>(context, listen: true);
+    return Scaffold(
+        appBar: AppBar(
+          title: const Text('Brießenchecker9000'),
+          actions: [
+            IconButton(
+              onPressed: () => DbHelper.logout(),
+              icon: const Icon(Icons.logout),
+            )
+          ],
+        ),
+        body: FutureBuilder(
+          future: checklistFuture,
+          builder: _futureBuilder,
+        ),
+        floatingActionButton: _fabBuilder);
   }
 }