Can change group virtual directory

lib/helpers/groups_helper.dart

@@ -193,6 +193,16 @@ class GroupsHelper {
     return groupInfo.info;
   }
 
+  /// Check the availability of a virtual directory
+  ///
+  /// Throws in case of error
+  static Future<void> checkVirtualDirectoryAvailability(
+          int groupID, String dir) async =>
+      await APIRequest(uri: "groups/checkVirtualDirectory", needLogin: true)
+          .addInt("groupID", groupID)
+          .addString("directory", dir)
+          .execWithThrow();
+
   /// Update (set) new group settings
   ///
   /// Throws in case of error

lib/models/group.dart

@@ -28,7 +28,7 @@ class Group {
   final GroupVisibilityLevel visibilityLevel;
   final GroupRegistrationLevel registrationLevel;
   final GroupPostCreationLevel postCreationLevel;
-  final String virtualDirectory;
+  String virtualDirectory;
   bool following;
 
   Group({

lib/ui/dialogs/virtual_directory_dialog.dart

@@ -1,3 +1,4 @@
+import 'package:comunic/helpers/groups_helper.dart';
 import 'package:comunic/helpers/settings_helper.dart';
 import 'package:comunic/ui/widgets/safe_state.dart';
 import 'package:comunic/utils/intl_utils.dart';
@@ -8,7 +9,7 @@ import 'package:flutter/material.dart';
 ///
 /// @author Pierre HUBERT
 
-enum VirtualDirectoryTargetType { USER }
+enum VirtualDirectoryTargetType { USER, GROUP }
 
 enum _CheckStatus { EMPTY, PENDING, VALID, INVALID }
 
@@ -122,6 +123,11 @@ class __VirtualDirectoryPickerState extends SafeState<_VirtualDirectoryPicker> {
         case VirtualDirectoryTargetType.USER:
           await SettingsHelper.checkUserDirectoryAvailability(value);
           break;
+
+        case VirtualDirectoryTargetType.GROUP:
+          await GroupsHelper.checkVirtualDirectoryAvailability(
+              widget.id, value);
+          break;
       }
 
       if (_currentValue == value) {

lib/ui/screens/group_settings_screen.dart

@@ -1,5 +1,6 @@
 import 'package:comunic/helpers/groups_helper.dart';
 import 'package:comunic/models/advanced_group_info.dart';
+import 'package:comunic/ui/dialogs/virtual_directory_dialog.dart';
 import 'package:comunic/ui/widgets/async_screen_widget.dart';
 import 'package:comunic/ui/widgets/comunic_back_button_widget.dart';
 import 'package:comunic/ui/widgets/safe_state.dart';
@@ -89,6 +90,25 @@ class _GroupSettingsScreenState extends SafeState<GroupSettingsScreen> {
               _groupSettings.name = s;
               _updateSettings();
             }),
+
+        // Group virtual directory
+        SettingsTile(
+          title: tr("Virtual directory (optional)"),
+          subtitle: _groupSettings.virtualDirectory,
+          onTap: () async {
+            final newDir = await showVirtualDirectoryDialog(
+              context: context,
+              initialDirectory: _groupSettings.virtualDirectory,
+              id: _groupSettings.id,
+              type: VirtualDirectoryTargetType.GROUP,
+            );
+
+            if (newDir == null) return;
+
+            _groupSettings.virtualDirectory = newDir;
+            _updateSettings();
+          },
+        ),
       ],
     );
   }