Add messageeventmodel.

matrix/messageeventmodel.h

@@ -0,0 +1,38 @@
+#ifndef MESSAGEEVENTMODEL_H
+#define MESSAGEEVENTMODEL_H
+
+#pragma once
+
+#include <QtCore/QAbstractListModel>
+
+class MessageEventModel: public QAbstractListModel
+{
+        Q_OBJECT
+        // The below property is marked constant because it only changes
+        // when the whole model is reset (so anything that depends on the model
+        // has to be re-calculated anyway).
+        // XXX: A better way would be to make [Room::]Timeline a list model
+        // itself, leaving only representation of the model to a client.
+        Q_PROPERTY(QuaternionRoom* room MEMBER m_currentRoom CONSTANT)
+    public:
+        explicit MessageEventModel(QObject* parent = nullptr);
+
+        void changeRoom(QuaternionRoom* room);
+
+        int rowCount(const QModelIndex& parent = QModelIndex()) const override;
+        QVariant data(const QModelIndex& index, int role = Qt::DisplayRole) const override;
+        QHash<int, QByteArray> roleNames() const override;
+
+    private slots:
+        void refreshEvent(const QString& eventId);
+
+    private:
+        QuaternionRoom* m_currentRoom;
+        QString lastReadEventId;
+
+        QDateTime makeMessageTimestamp(QuaternionRoom::rev_iter_t baseIt) const;
+        QString makeDateString(QuaternionRoom::rev_iter_t baseIt) const;
+        void refreshEventRoles(const QString& eventId, const QVector<int> roles);
+};
+
+#endif // MESSAGEEVENTMODEL_H