Can delete a conversation from the list of conversations

lib/helpers/conversations_helper.dart

@@ -61,6 +61,19 @@ class ConversationsHelper {
     return response.code == 200;
   }
 
+  /// Delete a conversation specified by its [id]
+  Future<bool> deleteConversation(int id) async {
+    final response = await APIRequest(
+      uri: "conversations/delete",
+      needLogin: true,
+      args: {
+        "conversationID": id.toString(),
+      },
+    ).exec();
+
+    return response.code == 200;
+  }
+
   /// Download the list of conversations from the server
   Future<ConversationsList> downloadList() async {
     final response =

lib/ui/screens/conversations_list_screen.dart

@@ -2,6 +2,7 @@ import 'package:comunic/enums/load_error_level.dart';
 import 'package:comunic/helpers/conversations_helper.dart';
 import 'package:comunic/helpers/users_helper.dart';
 import 'package:comunic/lists/conversations_list.dart';
+import 'package:comunic/models/conversation.dart';
 import 'package:comunic/ui/routes/conversation_route.dart';
 import 'package:comunic/ui/routes/create_conversation_route.dart';
 import 'package:comunic/ui/tiles/conversation_tile.dart';
@@ -105,6 +106,43 @@ class _ConversationScreenState extends State<ConversationsListScreen> {
         .push(MaterialPageRoute(builder: (c) => CreateConversationRoute()));
   }
 
+  /// Handles conversation deletion request
+  Future<void> _requestDeleteConversation(Conversation conversation) async {
+    final result = await showDialog<bool>(
+      context: context,
+      builder: (c) {
+        return AlertDialog(
+          title: Text(tr("Delete conversation")),
+          content: Text(tr(
+              "Do you really want to remove this conversation from your list of conversations ? If you are the owner of this conversation, it will be completely deleted!")),
+          actions: <Widget>[
+            FlatButton(
+              onPressed: () => Navigator.pop(context, false),
+              child: Text(tr("cancel").toUpperCase()),
+            ),
+            FlatButton(
+              onPressed: () => Navigator.pop(context, true),
+              child: Text(
+                tr("delete").toUpperCase(),
+                style: TextStyle(color: Colors.red),
+              ),
+            )
+          ],
+        );
+      },
+    );
+
+    if (result == null || !result) return;
+
+    // Request the conversation to be deleted now
+    if (!await _conversationsHelper.deleteConversation(conversation.id))
+      Scaffold.of(context).showSnackBar(
+          SnackBar(content: Text(tr("Could not delete the conversation!"))));
+
+    // Reload the list of conversations
+    _loadConversationsList(false);
+  }
+
   @override
   Widget build(BuildContext context) {
     if (_error == LoadErrorLevel.MAJOR) return _buildErrorCard();
@@ -128,6 +166,7 @@ class _ConversationScreenState extends State<ConversationsListScreen> {
                     onOpen: (c) {
                       _openConversation(context, c.id);
                     },
+                    onRequestDelete: _requestDeleteConversation,
                   );
                 },
                 itemCount: _list.length,

lib/ui/tiles/conversation_tile.dart

@@ -10,20 +10,26 @@ import 'package:flutter/material.dart';
 /// @author Pierre HUBERT
 
 typedef OpenConversationCallback = void Function(Conversation);
+typedef RequestDeleteConversationCallback = void Function(Conversation);
+
+enum _PopupMenuChoices { DELETE }
 
 class ConversationTile extends StatelessWidget {
   final Conversation conversation;
   final UsersList usersList;
   final OpenConversationCallback onOpen;
+  final RequestDeleteConversationCallback onRequestDelete;
 
   const ConversationTile(
       {Key key,
       @required this.conversation,
       @required this.usersList,
-      @required this.onOpen})
+      @required this.onOpen,
+      @required this.onRequestDelete})
       : assert(conversation != null),
         assert(usersList != null),
         assert(onOpen != null),
+        assert(onRequestDelete != null),
         super(key: key);
 
   _buildSubInformation(IconData icon, String content) {
@@ -80,6 +86,26 @@ class ConversationTile extends StatelessWidget {
           ),
         ],
       ),
+
+      // Trailing information
+      trailing: PopupMenuButton<_PopupMenuChoices>(
+        itemBuilder: (b) => <PopupMenuEntry<_PopupMenuChoices>>[
+              PopupMenuItem(
+                child: Text(tr("Delete")),
+                value: _PopupMenuChoices.DELETE,
+              )
+            ],
+        onSelected: _conversationMenuCallback,
+      ),
     );
   }
+
+  /// Method called each time an option of the menu is selected
+  void _conversationMenuCallback(_PopupMenuChoices c) {
+    switch (c) {
+      case _PopupMenuChoices.DELETE:
+        onRequestDelete(conversation);
+        break;
+    }
+  }
 }