Can update a conversation message

lib/helpers/conversations_helper.dart

@@ -292,6 +292,13 @@ class ConversationsHelper {
               lastMessageID: lastMessageID);
   }
 
+  /// Get a single conversation message from the local database
+  ///
+  /// Returns the message if found or null in case of failure
+  Future<ConversationMessage> getSingleMessageFromCache(int messageID) async {
+    return await _conversationMessagesDatabaseHelper.get(messageID);
+  }
+
   /// Send a new message to the server
   Future<SendMessageResult> sendMessage(NewConversationMessage message) async {
     final request = APIRequest(
@@ -320,27 +327,34 @@ class ConversationsHelper {
     return SendMessageResult.SUCCESS;
   }
 
+  /// Update a message content
+  Future<bool> updateMessage(int id, String newContent) async {
+    final response = await APIRequest(
+        uri: "conversations/updateMessage",
+        needLogin: true,
+        args: {"messageID": id.toString(), "content": newContent}).exec();
+
+    if (response.code != 200) return false;
+
+    // Update the message content locally
+    return await _conversationMessagesDatabaseHelper.updateMessageContent(
+        id: id, newContent: newContent);
+  }
+
   /// Delete permanently a message specified by its [id]
   Future<bool> deleteMessage(int id) async {
-
     // Delete the message online
     final response = await APIRequest(
         uri: "conversations/deleteMessage",
         needLogin: true,
-      args: {
-        "messageID": id.toString()
-      }
-    ).exec();
-
-    if(response.code != 200) return false;
+        args: {"messageID": id.toString()}).exec();
 
+    if (response.code != 200) return false;
 
     // Delete the message locally
     return await _conversationMessagesDatabaseHelper.delete(id);
-
   }
 
-
   /// Turn an API response into a ConversationMessage object
   ConversationMessage _apiToConversationMessage({
     @required int conversationID,

lib/helpers/database/conversation_messages_database_helper.dart

@@ -2,6 +2,7 @@ import 'package:comunic/helpers/database/database_contract.dart';
 import 'package:comunic/helpers/database/model_database_helper.dart';
 import 'package:comunic/lists/conversation_messages_list.dart';
 import 'package:comunic/models/conversation_message.dart';
+import 'package:meta/meta.dart';
 
 /// Conversation messages database helper
 ///
@@ -34,4 +35,26 @@ class ConversationMessagesDatabaseHelper
     finalList.addAll(list);
     return finalList;
   }
+
+  /// Update the content of a message
+  Future<bool> updateMessageContent({
+    @required int id,
+    @required String newContent,
+  }) async {
+    assert(id != null);
+    assert(newContent != null);
+
+    final message = await get(id);
+
+    if(message == null)
+      return false;
+
+    // Update the conversation message using the map
+    final map = message.toMap();
+    map[ConversationsMessagesTableContract.C_MESSAGE] = newContent;
+
+    await insertOrUpdate(ConversationMessage.fromMap(map));
+
+    return true; // Success
+  }
 }

lib/ui/screens/conversation_screen.dart

@@ -289,6 +289,7 @@ class _ConversationScreenState extends State<ConversationScreen> {
               userInfo: _usersInfo.getUser(_messages[i].userID),
               isLastMessage: _isLastMessage(i),
               isFirstMessage: _isFirstMessage(i),
+              onRequestMessageUpdate: _updateMessage,
               onRequestMessageDelete: _deleteMessage,
             );
           }),
@@ -389,6 +390,33 @@ class _ConversationScreenState extends State<ConversationScreen> {
     );
   }
 
+  /// Request message content update
+  Future<void> _updateMessage(ConversationMessage message) async {
+    final newContent = await askUserString(
+        context: context,
+        title: tr("Update message"),
+        message: tr("Please enter new message content:"),
+        defaultValue: message.message,
+        hint: tr("New message"));
+
+    if (newContent == null) return;
+
+    if (!await _conversationsHelper.updateMessage(message.id, newContent)) {
+      showSimpleSnack(context, tr("Could not update message content!"));
+      return;
+    }
+
+    // Get the new version of the conversation message
+    final newMessage =
+        await _conversationsHelper.getSingleMessageFromCache(message.id);
+
+    setState(() {
+      final index = _messages.indexOf(message);
+      _messages.insert(index, newMessage);
+      _messages.removeAt(index + 1);
+    });
+  }
+
   /// Request message deletion
   Future<void> _deleteMessage(ConversationMessage message) async {
     final choice = await showDialog<bool>(
@@ -417,11 +445,10 @@ class _ConversationScreenState extends State<ConversationScreen> {
           ),
     );
 
-    if(choice == null || !choice)
-      return;
+    if (choice == null || !choice) return;
 
     // Execute the request
-    if(!await _conversationsHelper.deleteMessage(message.id))
+    if (!await _conversationsHelper.deleteMessage(message.id))
       showSimpleSnack(context, tr("Could not delete conversation message!"));
 
     // Remove the message from the list

lib/ui/tiles/conversation_message_tile.dart

@@ -12,8 +12,9 @@ import 'package:flutter/material.dart';
 ///
 /// @author Pierre HUBERT
 
-enum _MenuChoices { DELETE }
+enum _MenuChoices { DELETE, REQUEST_UPDATE_CONTENT }
 
+typedef OnRequestMessageUpdate = void Function(ConversationMessage);
 typedef OnRequestMessageDelete = void Function(ConversationMessage);
 
 class ConversationMessageTile extends StatelessWidget {
@@ -21,6 +22,7 @@ class ConversationMessageTile extends StatelessWidget {
   final User userInfo;
   final bool isLastMessage;
   final bool isFirstMessage;
+  final OnRequestMessageUpdate onRequestMessageUpdate;
   final OnRequestMessageDelete onRequestMessageDelete;
 
   const ConversationMessageTile({
@@ -29,11 +31,13 @@ class ConversationMessageTile extends StatelessWidget {
     @required this.userInfo,
     @required this.isLastMessage,
     @required this.isFirstMessage,
+    @required this.onRequestMessageUpdate,
     @required this.onRequestMessageDelete,
   })  : assert(message != null),
         assert(userInfo != null),
         assert(isLastMessage != null),
         assert(isFirstMessage != null),
+        assert(onRequestMessageUpdate != null),
         assert(onRequestMessageDelete != null),
         super(key: key);
 
@@ -47,6 +51,14 @@ class ConversationMessageTile extends StatelessWidget {
           width: 35.0,
         ),
         itemBuilder: (c) => [
+              // Update message content
+              PopupMenuItem(
+                enabled: message.isOwner,
+                value: _MenuChoices.REQUEST_UPDATE_CONTENT,
+                child: Text(tr("Update")),
+              ),
+
+              // Delete the message
               PopupMenuItem(
                 enabled: message.isOwner,
                 value: _MenuChoices.DELETE,
@@ -256,12 +268,14 @@ class ConversationMessageTile extends StatelessWidget {
 
   /// Process menu choice
   void _menuOptionSelected(_MenuChoices value) {
+    switch (value) {
+      case _MenuChoices.REQUEST_UPDATE_CONTENT:
+        onRequestMessageUpdate(message);
+        break;
 
-    switch(value){
       case _MenuChoices.DELETE:
         onRequestMessageDelete(message);
         break;
     }
-
   }
 }

lib/utils/ui_utils.dart

@@ -1,7 +1,10 @@
 import 'package:cached_network_image/cached_network_image.dart';
+import 'package:comunic/utils/intl_utils.dart';
 import 'package:flutter/material.dart';
 
 /// User interface utilities
+///
+/// @author Pierre HUBERT
 
 /// Build centered progress bar
 Widget buildCenteredProgressBar() {
@@ -52,17 +55,66 @@ Widget buildErrorCard(String message, {List<Widget> actions}) {
 /// Show an image with a given [url] in full screen
 void showImageFullScreen(BuildContext context, String url) {
   Navigator.of(context).push(MaterialPageRoute(builder: (c) {
-
     // TODO : add better support later
     return CachedNetworkImage(
       imageUrl: url,
     );
-
   }));
 }
 
-
 /// Show simple snack
 void showSimpleSnack(BuildContext context, String message) {
   Scaffold.of(context).showSnackBar(SnackBar(content: Text(message)));
 }
+
+/// Show an alert dialog to ask the user to enter a string
+Future<String> askUserString({
+  @required BuildContext context,
+  @required String title,
+  @required String message,
+  @required String defaultValue,
+  @required String hint,
+}) async {
+  assert(context != null);
+  assert(title != null);
+  assert(message != null);
+  assert(defaultValue != null);
+  assert(hint != null);
+
+  TextEditingController controller = TextEditingController(text: defaultValue);
+
+  final confirm = await showDialog<bool>(
+      context: context,
+      builder: (c) => AlertDialog(
+            title: Text(title),
+            content: Column(
+              children: <Widget>[
+                Text(message),
+                TextField(
+                  controller: controller,
+                  maxLines: null,
+                  maxLength: 200,
+                  keyboardType: TextInputType.text,
+                  decoration: InputDecoration(
+                    labelText: hint,
+                    alignLabelWithHint: true,
+                  ),
+                )
+              ],
+            ),
+            actions: <Widget>[
+              FlatButton(
+                child: Text(tr("Cancel").toUpperCase()),
+                onPressed: () => Navigator.pop(c, false),
+              ),
+              FlatButton(
+                child: Text(tr("OK")),
+                onPressed: () => Navigator.pop(c, true),
+              ),
+            ],
+          ));
+
+  if (confirm == null || !confirm) return null;
+
+  return controller.text;
+}