feat: add a quick edit workflow using the up arrow key

neochat now supports a quick edit shortcut, which helps to edit
the last message from the user in a room.

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imports/NeoChat/Component/ChatBox/ChatBar.qml

@@ -28,6 +28,7 @@ ToolBar {
     signal inputFieldForceActiveFocusTriggered()
     signal messageSent()
     signal pasteImageTriggered()
+    signal editLastUserMessage()
 
     property alias isCompleting: completionMenu.visible
 
@@ -141,6 +142,8 @@ ToolBar {
                         switchRoomUp();
                     } else if (event.key === Qt.Key_V && event.modifiers & Qt.ControlModifier) {
                         chatBar.pasteImage();
+                    } else if (event.key === Qt.Key_Up && !(event.modifiers & Qt.ControlModifier)) {
+                        editLastUserMessage();
                     }
                 }
 

imports/NeoChat/Component/ChatBox/ChatBox.qml

@@ -17,6 +17,7 @@ Item {
 
     signal fancyEffectsReasonFound(string fancyEffect)
     signal messageSent()
+    signal editLastUserMessage()
 
     Kirigami.Theme.colorSet: Kirigami.Theme.View
 
@@ -153,6 +154,9 @@ Item {
             checkForFancyEffectsReason()
             root.messageSent();
         }
+        onEditLastUserMessage: {
+            root.editLastUserMessage();
+        }
     }
 
     function checkForFancyEffectsReason() {

imports/NeoChat/Page/RoomPage.qml

@@ -651,6 +651,12 @@ Kirigami.ScrollablePage {
                 goToLastMessage();
             }
         }
+        onEditLastUserMessage: {
+            const targetMessage = messageEventModel.getLastLocalUserMessageEventId();
+            if (targetMessage) {
+                ChatBoxHelper.edit(targetMessage["body"], targetMessage["body"], targetMessage["event_id"]);
+            }
+        }
     }
 
     background: FancyEffectsContainer {

src/messageeventmodel.cpp

@@ -632,3 +632,38 @@ int MessageEventModel::eventIDToIndex(const QString &eventID) const
     }
     return it - m_currentRoom->messageEvents().rbegin() + timelineBaseIndex();
 }
+
+QVariant MessageEventModel::getLastLocalUserMessageEventId()
+{
+    QVariantMap targetMessage;
+    const auto &timelineBottom = m_currentRoom->messageEvents().rbegin();
+
+    // set a cap limit of 35 messages, to prevent loading a lot of messages
+    // in rooms where the user has not sent many messages
+    const auto limit = timelineBottom + std::min(35, m_currentRoom->timelineSize());
+
+    for (auto it = timelineBottom; it != limit; ++it) {
+        auto evt = it->event();
+        auto e = eventCast<const RoomMessageEvent>(evt);
+
+        // check if the current message's sender's id is same as the user's id
+        if ((*it)->senderId() == m_currentRoom->localUser()->id()) {
+            auto content = (*it)->contentJson();
+
+            if (content.contains("m.relates_to")) {
+                // the message has been edited once
+                // so we have to return the id of the related' message instead
+                targetMessage.insert("event_id",content["m.relates_to"].toObject()["event_id"].toString());
+                targetMessage.insert("body", content["formatted_body"].toString());
+                return targetMessage;
+            }
+
+            if (e->msgtype() == MessageEventType::Text) {
+                targetMessage.insert("event_id", (*it)->id());
+                targetMessage.insert("body", content["body"].toString());
+                return targetMessage;
+            }
+        }
+    }
+    return targetMessage;
+}

src/messageeventmodel.h

@@ -69,6 +69,7 @@ public:
     [[nodiscard]] QHash<int, QByteArray> roleNames() const override;
 
     Q_INVOKABLE [[nodiscard]] int eventIDToIndex(const QString &eventID) const;
+    Q_INVOKABLE [[nodiscard]] QVariant getLastLocalUserMessageEventId();
 
 private Q_SLOTS:
     int refreshEvent(const QString &eventId);