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

sorting && init categoriy for rooms.

src/roomlistmodel.h

@@ -0,0 +1,51 @@
+#ifndef ROOMLISTMODEL_H
+#define ROOMLISTMODEL_H
+
+#include <QtCore/QAbstractListModel>
+#include "connection.h"
+#include "room.h"
+
+class RoomListModel : public QAbstractListModel {
+  Q_OBJECT
+  Q_PROPERTY(QMatrixClient::Connection* connection READ getConnection WRITE
+                 setConnection)
+
+ public:
+  enum EventRoles {
+    NameRole = Qt::UserRole + 1,
+    AvatarRole,
+    TopicRole,
+    CategoryRole,
+    HighlightRole,
+  };
+
+  RoomListModel(QObject* parent = 0);
+  virtual ~RoomListModel();
+
+  QMatrixClient::Connection* getConnection() { return m_connection; }
+  void setConnection(QMatrixClient::Connection* connection);
+
+  Q_INVOKABLE QMatrixClient::Room* roomAt(int row);
+
+  QVariant data(const QModelIndex& index,
+                int role = Qt::DisplayRole) const override;
+  Q_INVOKABLE int rowCount(
+      const QModelIndex& parent = QModelIndex()) const override;
+
+  QHash<int, QByteArray> roleNames() const;
+
+ private slots:
+  void namesChanged(QMatrixClient::Room* room);
+  void unreadMessagesChanged(QMatrixClient::Room* room);
+  void addRoom(QMatrixClient::Room* room);
+  void deleteRoom(QMatrixClient::Room* room);
+
+ private:
+  QMatrixClient::Connection* m_connection = nullptr;
+  QList<QMatrixClient::Room*> m_rooms;
+
+ signals:
+  void connectionChanged();
+};
+
+#endif  // ROOMLISTMODEL_H