Some basic reply support.

qml/component/MessageDelegate.qml

@@ -82,7 +82,8 @@ RowLayout {
                 selectByMouse: true
                 readOnly: true
                 wrapMode: Label.Wrap
-                selectionColor: Material.accent
+                selectedTextColor: highlighted ? Material.accent : "white"
+                selectionColor: highlighted ? "white" : Material.accent
                 textFormat: Text.RichText
 
                 onLinkActivated: Qt.openUrlExternally(link)

qml/form/RoomForm.qml

@@ -332,12 +332,15 @@ Item {
                     onClicked: currentRoom.chooseAndUploadFile()
                 }
 
-                TextField {
+                ScrollView {
-                    property real progress: 0
-
                     Layout.fillWidth: true
                     Layout.preferredHeight: 48
 
+                    clip: true
+
+                    TextArea {
+                        property real progress: 0
+
                         id: inputField
 
                         placeholderText: "Send a Message"
@@ -345,6 +348,7 @@ Item {
                         topPadding: 0
                         bottomPadding: 0
                         selectByMouse: true
+                        verticalAlignment: TextEdit.AlignVCenter
 
                         text: currentRoom ? currentRoom.cachedInput : ""
 
@@ -354,20 +358,19 @@ Item {
                             currentRoom.cachedInput = text
                         }
 
-                    Keys.onReturnPressed: {
+                        background: Rectangle { color: MSettings.darkTheme ? "#282828" : "#eaeaea" }
-                        if (inputField.text) {
+
+                        ToolTip.visible: currentRoom && currentRoom.hasUsersTyping
+                        ToolTip.text: currentRoom ? currentRoom.usersTyping : ""
+
+                        Shortcut {
+                            sequence: "Ctrl+Return"
+                            onActivated: {
                                 inputField.postMessage(inputField.text)
                                 inputField.text = ""
                             }
                         }
 
-                    background: Rectangle {
-                        color: MSettings.darkTheme ? "#282828" : "#eaeaea"
-                    }
-
-                    ToolTip.visible: currentRoom && currentRoom.hasUsersTyping
-                    ToolTip.text: currentRoom ? currentRoom.usersTyping : ""
-
                         Timer {
                             id: timeoutTimer
 
@@ -398,6 +401,13 @@ Item {
                             var PREFIX_HTML = '/html '
                             var PREFIX_MARKDOWN = '/md '
 
+                            var replyRe = new RegExp("^> <(.*)><(.*)> (.*)\n\n(.*)")
+                            if (text.match(replyRe)) {
+                                var matches = text.match(replyRe)
+                                currentRoom.sendReply(matches[1], matches[2], matches[3], matches[4])
+                                return
+                            }
+
                             if (text.indexOf(PREFIX_ME) === 0) {
                                 text = text.substr(PREFIX_ME.length)
                                 currentRoom.postMessage(text, RoomMessageEvent.Emote)
@@ -436,6 +446,7 @@ Item {
                             currentRoom.postPlainText(text)
                         }
                     }
+                }
 
                 ItemDelegate {
                     Layout.preferredWidth: 48

qml/menu/MessageContextMenu.qml

@@ -41,6 +41,16 @@ Menu {
 
         onTriggered: row.saveFileAs()
     }
+    MenuItem {
+        visible: model && model.author !== currentRoom.localUser
+        height: visible ? undefined : 0
+        text: "Reply"
+
+        onTriggered: {
+            inputField.clear()
+            inputField.insert(0, "> <" + model.author.id + "><" + model.eventId + "> " + model.message + "\n\n")
+        }
+    }
     MenuItem {
         visible: model && model.author === currentRoom.localUser
         height: visible ? undefined : 0

src/matriqueroom.cpp

@@ -124,3 +124,18 @@ void MatriqueRoom::countChanged() {
     resetHighlightCount();
   }
 }
+
+void MatriqueRoom::sendReply(QString userId, QString eventId,
+                             QString replyContent, QString sendContent) {
+  QJsonObject json{
+      {"msgtype", "m.text"},
+      {"body", "> <" + userId + "> " + replyContent + "\n\n" + sendContent},
+      {"format", "org.matrix.custom.html"},
+      {"m.relates_to", QJsonObject{{"m.in_reply_to", QJsonObject{{"event_id", eventId}}}}},
+      {"formatted_body",
+       "<mx-reply><blockquote><a href=\"https://matrix.to/#/" + id() + "/" +
+           eventId + "\">In reply to</a> <a href=\"https://matrix.to/#/" +
+           userId + "\">" + userId + "</a><br>" + replyContent +
+           "</blockquote></mx-reply>" + sendContent}};
+  postJson("m.room.message", json);
+}

src/matriqueroom.h

@@ -59,6 +59,7 @@ class MatriqueRoom : public Room {
   void acceptInvitation();
   void forget();
   void sendTypingNotification(bool isTyping);
+  void sendReply(QString userId, QString eventId, QString replyContent, QString sendContent);
 };
 
 #endif  // MATRIQUEROOM_H

src/messageeventmodel.cpp

@@ -15,6 +15,7 @@
 QHash<int, QByteArray> MessageEventModel::roleNames() const {
   QHash<int, QByteArray> roles = QAbstractItemModel::roleNames();
   roles[EventTypeRole] = "eventType";
+  roles[MessageRole] = "message";
   roles[AboveEventTypeRole] = "aboveEventType";
   roles[EventIdRole] = "eventId";
   roles[TimeRole] = "time";
@@ -415,6 +416,8 @@ QVariant MessageEventModel::data(const QModelIndex& idx, int role) const {
         tr("Unknown Event"));
   }
 
+  if (role == MessageRole) return evt.contentJson().value("body");
+
   if (role == Qt::ToolTipRole) {
     return evt.originalJson();
   }

src/messageeventmodel.h

@@ -13,6 +13,7 @@ class MessageEventModel : public QAbstractListModel {
  public:
   enum EventRoles {
     EventTypeRole = Qt::UserRole + 1,
+    MessageRole,
     AboveEventTypeRole,
     EventIdRole,
     TimeRole,