Show custom emoji reactions as per MSC4027

src/models/reactionmodel.cpp

@@ -80,7 +80,7 @@ QVariant ReactionModel::data(const QModelIndex &index, int role) const
                       "%2 reacted with %3",
                       reaction.authors.count(),
                       text,
-                      reactionText(reaction.reaction));
+                      m_shortcodes.contains(reaction.reaction) ? m_shortcodes[reaction.reaction] : reactionText(reaction.reaction));
         return text;
     }
 
@@ -111,6 +111,7 @@ void ReactionModel::updateReactions()
     beginResetModel();
 
     m_reactions.clear();
+    m_shortcodes.clear();
 
     const auto &annotations = m_room->relatedEvents(*m_event, Quotient::EventRelation::AnnotationType);
     if (annotations.isEmpty()) {
@@ -125,6 +126,9 @@ void ReactionModel::updateReactions()
         }
         if (const auto &e = eventCast<const Quotient::ReactionEvent>(a)) {
             reactions[e->key()].append(m_room->user(e->senderId()));
+            if (e->contentJson()[QStringLiteral("shortcode")].toString().length()) {
+                m_shortcodes[e->key()] = e->contentJson()[QStringLiteral("shortcode")].toString().toHtmlEscaped();
+            }
         }
     }
 
@@ -158,8 +162,18 @@ QHash<int, QByteArray> ReactionModel::roleNames() const
     };
 }
 
-QString ReactionModel::reactionText(const QString &text)
+QString ReactionModel::reactionText(QString text) const
 {
+    text = text.toHtmlEscaped();
+    if (text.startsWith(QStringLiteral("mxc://"))) {
+        static QFont font;
+        static int size = font.pixelSize();
+        if (size == -1) {
+            size = font.pointSizeF() * 1.333;
+        }
+        return QStringLiteral("<img src=\"%1\" width=\"%2\" height=\"%2\">")
+            .arg(m_room->connection()->makeMediaUrl(QUrl(text)).toString(), QString::number(size));
+    }
     const auto isEmoji = [](const QString &text) {
 #ifdef HAVE_ICU
         QTextBoundaryFinder finder(QTextBoundaryFinder::Grapheme, text);

src/models/reactionmodel.h

@@ -71,8 +71,9 @@ private:
     const NeoChatRoom *m_room;
     const Quotient::RoomMessageEvent *m_event;
     QList<Reaction> m_reactions;
+    QMap<QString, QString> m_shortcodes;
 
     void updateReactions();
-    static QString reactionText(const QString &text);
+    QString reactionText(QString text) const;
 };
 Q_DECLARE_METATYPE(ReactionModel *)

src/qml/ReactionDelegate.qml

@@ -39,14 +39,17 @@ Flow {
             width: Math.max(contentItem.implicitWidth + leftPadding + rightPadding, height)
             height: Math.round(Kirigami.Units.gridUnit * 1.5)
 
-            contentItem: QQC2.Label {
-                id: reactionLabel
-                horizontalAlignment: Text.AlignHCenter
-                verticalAlignment: Text.AlignVCenter
-                text: reactionDelegate.textContent
-                background: null
-                wrapMode: TextEdit.NoWrap
-                textFormat: Text.RichText
+            contentItem: Item {
+                QQC2.Label {
+                    id: reactionLabel
+                    anchors.centerIn: parent
+                    horizontalAlignment: Text.AlignHCenter
+                    verticalAlignment: Text.AlignVCenter
+                    text: reactionDelegate.textContent
+                    background: null
+                    wrapMode: TextEdit.NoWrap
+                    textFormat: Text.RichText
+                }
             }
 
             padding: Kirigami.Units.smallSpacing
@@ -66,6 +69,7 @@ Flow {
 
             hoverEnabled: true
 
+            QQC2.ToolTip.delay: Kirigami.Units.toolTipDelay
             QQC2.ToolTip.visible: hovered
             QQC2.ToolTip.text: reactionDelegate.toolTip
         }