See and change description of checklist

lib/models/checklist.dart

@@ -1,10 +1,13 @@
 class Checklist {
   final int id;
   final String ownerId;
-  String title;
+  String _title;
   String description;
   final DateTime createdTime;
 
+  String get title => _title == '' ? 'Unnamed $id' : _title;
+
   Checklist(
-      this.id, this.ownerId, this.title, this.description, this.createdTime);
+      this.id, this.ownerId, String title, this.description, this.createdTime)
+      : _title = title;
 }

lib/pages/detail_checklist_page.dart

@@ -179,16 +179,9 @@ class _DetailChecklistPageState extends State<DetailChecklistPage> {
     if (snapshot.hasData) {
       _items = DbHelper.resToItemList(snapshot.data!);
     }
-    return Column(
+    return ListView.builder(
-      children: [
-        Text(_checklist!.description),
-        Expanded(
-          child: ListView.builder(
       itemCount: _items.length,
       itemBuilder: _itemListBuilder,
-          ),
-        ),
-      ],
     );
   }
 
@@ -198,6 +191,9 @@ class _DetailChecklistPageState extends State<DetailChecklistPage> {
       appBar: AppBar(
         title: _pageTitleBuilder,
         actions: [
+          if (!_titleEditMode)
+            IconButton(
+                onPressed: _onInfoButtonPressed, icon: const Icon(Icons.info)),
           if (_titleEditMode)
             IconButton(
               onPressed: () => _onTitleChanged(
@@ -244,4 +240,36 @@ class _DetailChecklistPageState extends State<DetailChecklistPage> {
       await DbHelper.deleteCheckedEntry(_checklist!.id, id!);
     }
   }
+
+  void _onInfoButtonPressed() {
+    TextEditingController desCon = TextEditingController();
+    desCon.text = _checklist!.description;
+    showDialog(
+      context: context,
+      builder: (context) => AlertDialog(
+        title: Text(_checklist!.title),
+        content: SizedBox(
+          width: 300,
+          child: DbHelper.isOwner(_checklist!.ownerId)
+              ? TextField(
+                  controller: desCon,
+                  maxLines: 5,
+                  decoration: const InputDecoration(
+                    label: Text('Description'),
+                  ),
+                )
+              : Text(_checklist!.description),
+        ),
+        actions: [
+          TextButton(
+            onPressed: () => Navigator.of(context).pop(),
+            child: const Text('Ok'),
+          )
+        ],
+      ),
+    ).whenComplete(() {
+      DbHelper.updateChecklistDescription(_checklist!.id, desCon.text);
+      setState(() => _checklist!.description = desCon.text);
+    });
+  }
 }

lib/services/dbhelper.dart

@@ -86,6 +86,13 @@ class DbHelper {
         .update({'title': title}).eq('id', id);
   }
 
+  static Future<void> updateChecklistDescription(
+      int id, String description) async {
+    await _client
+        .from(checklistsTableName)
+        .update({'description': description}).eq('id', id);
+  }
+
   /// returns id of newly created checklist
   static Future<int> addOrUpdateChecklist(Checklist? checklist) async {
     final ownerId = _client.auth.currentSession!.user.id;