Add recently pinned message to the top of the window

This makes pinned messages actually quite useful, as rooms can stick
persistent and important information for users to see. (For example, the
KWin has crash triage meeting information pinned in their room.)

For simplicity and space reasons, only one line of the generic message
body is shown.

src/libneochat/neochatroom.cpp

@@ -44,6 +44,7 @@
 
 #include "chatbarcache.h"
 #include "clipboard.h"
+#include "eventhandler.h"
 #include "events/pollevent.h"
 #include "filetransferpseudojob.h"
 #include "neochatconnection.h"
@@ -55,6 +56,7 @@
 #include <KIO/Job>
 #include <KIO/JobTracker>
 #endif
+
 #include <KJobTrackerInterface>
 #include <KLocalizedString>
 
@@ -130,11 +132,13 @@ NeoChatRoom::NeoChatRoom(Connection *connection, QString roomId, JoinState joinS
         this,
         [this]() {
             updatePushNotificationState(u"m.push_rules"_s);
+            loadPinnedMessage();
 
             Q_EMIT canEncryptRoomChanged();
             Q_EMIT inviteTimestampChanged();
         },
         Qt::SingleShotConnection);
+    connect(this, &Room::pinnedEventsChanged, this, &NeoChatRoom::loadPinnedMessage);
     connect(this, &Room::changed, this, [this] {
         Q_EMIT canEncryptRoomChanged();
         Q_EMIT parentIdsChanged();
@@ -1170,6 +1174,19 @@ void NeoChatRoom::setPushNotificationState(PushNotificationState::State state)
     Q_EMIT pushNotificationStateChanged(m_currentPushNotificationState);
 }
 
+void NeoChatRoom::loadPinnedMessage()
+{
+    const auto events = pinnedEventIds();
+    if (!events.isEmpty()) {
+        const QString &mostRecentEventId = events.last();
+        connection()->callApi<GetOneRoomEventJob>(id(), mostRecentEventId).then([this](const auto &job) {
+            auto event = fromJson<event_ptr_tt<RoomEvent>>(job->jsonData());
+            m_pinnedMessage = EventHandler::richBody(this, event.get());
+            Q_EMIT pinnedMessageChanged();
+        });
+    }
+}
+
 void NeoChatRoom::updatePushNotificationState(QString type)
 {
     if (type != "m.push_rules"_L1 || m_pushNotificationStateUpdating) {
@@ -1810,4 +1827,9 @@ bool NeoChatRoom::isCreator(const QString &userId) const
         && (createEvent->senderId() == userId || createEvent->contentPart<QStringList>(u"additional_creators"_s).contains(userId));
 }
 
+QString NeoChatRoom::pinnedMessage() const
+{
+    return m_pinnedMessage;
+}
+
 #include "moc_neochatroom.cpp"

src/libneochat/neochatroom.h

@@ -203,6 +203,11 @@ class NeoChatRoom : public Quotient::Room
      */
     Q_PROPERTY(QString invitingUserId READ invitingUserId NOTIFY baseStateLoaded)
 
+    /**
+     * @brief The most recently pinned message in the room.
+     */
+    Q_PROPERTY(QString pinnedMessage READ pinnedMessage NOTIFY pinnedMessageChanged)
+
 public:
     explicit NeoChatRoom(Quotient::Connection *connection, QString roomId, Quotient::JoinState joinState = {});
 
@@ -612,6 +617,11 @@ public:
      */
     bool isCreator(const QString &userId) const;
 
+    /**
+     * @return The most recent pinned message in the room.
+     */
+    QString pinnedMessage() const;
+
 private:
     bool m_visible = false;
 
@@ -644,6 +654,8 @@ private:
 
     std::unordered_map<QString, std::unique_ptr<NeochatRoomMember>> m_memberObjects;
     static std::function<bool(const Quotient::RoomEvent *)> m_hiddenFilter;
+    QString m_pinnedMessage;
+    void loadPinnedMessage();
 
 private Q_SLOTS:
     void updatePushNotificationState(QString type);
@@ -674,6 +686,7 @@ Q_SIGNALS:
     void extraEventLoaded(const QString &eventId);
     void extraEventNotFound(const QString &eventId);
     void inviteTimestampChanged();
+    void pinnedMessageChanged();
 
     /**
      * @brief Request a message be shown to the user of the given type.