Alter code structure && change room list filtering mechanics && add

sorting && init categoriy for rooms.

src/messageeventmodel.h

@@ -0,0 +1,58 @@
+#ifndef MESSAGEEVENTMODEL_H
+#define MESSAGEEVENTMODEL_H
+
+#include <QtCore/QAbstractListModel>
+#include "room.h"
+
+class MessageEventModel : public QAbstractListModel {
+  Q_OBJECT
+  Q_PROPERTY(
+      QMatrixClient::Room* room READ getRoom WRITE setRoom NOTIFY roomChanged)
+
+ public:
+  enum EventRoles {
+    EventTypeRole = Qt::UserRole + 1,
+    EventIdRole,
+    TimeRole,
+    SectionRole,
+    AboveSectionRole,
+    AuthorRole,
+    AboveAuthorRole,
+    ContentRole,
+    ContentTypeRole,
+    HighlightRole,
+    ReadMarkerRole,
+    SpecialMarksRole,
+    LongOperationRole,
+    // For debugging
+    EventResolvedTypeRole,
+  };
+
+  explicit MessageEventModel(QObject* parent = nullptr);
+  ~MessageEventModel();
+
+  QMatrixClient::Room* getRoom() { return m_currentRoom; }
+  void setRoom(QMatrixClient::Room* room);
+
+  Q_INVOKABLE int rowCount(
+      const QModelIndex& parent = QModelIndex()) const override;
+  QVariant data(const QModelIndex& index, int role) const override;
+  QHash<int, QByteArray> roleNames() const;
+
+ private slots:
+  void refreshEvent(const QString& eventId);
+
+ private:
+  QMatrixClient::Room* m_currentRoom = nullptr;
+  QString lastReadEventId;
+  int nextNewerRow = -1;
+
+  QDateTime makeMessageTimestamp(QMatrixClient::Room::rev_iter_t baseIt) const;
+  QString makeDateString(QMatrixClient::Room::rev_iter_t baseIt) const;
+  void refreshEventRoles(const QString& eventId, const QVector<int> roles);
+
+ signals:
+  void roomChanged();
+};
+
+#endif  // MESSAGEEVENTMODEL_H