Create a common MessageModel and inherit SearchModel and MessageEventModel from it.

Title

src/models/timelinemessagemodel.h

@@ -0,0 +1,98 @@
+// SPDX-FileCopyrightText: 2018-2019 Black Hat <bhat@encom.eu.org>
+// SPDX-License-Identifier: GPL-3.0-only
+
+#pragma once
+
+#include <QAbstractListModel>
+#include <QQmlEngine>
+
+#include "messagemodel.h"
+
+class ReactionModel;
+
+namespace Quotient
+{
+class RoomEvent;
+}
+
+/**
+ * @class TimelineMessageModel
+ *
+ * This class defines the model for visualising the room timeline.
+ *
+ * This model covers all event types in the timeline with many of the roles being
+ * specific to a subset of events. This means the user needs to understand which
+ * roles will return useful information for a given event type.
+ *
+ * @sa NeoChatRoom
+ */
+class TimelineMessageModel : public MessageModel
+{
+    Q_OBJECT
+    QML_ELEMENT
+
+public:
+    /**
+     * @brief Defines the model roles.
+     */
+    enum EventRoles {
+        DelegateTypeRole = Qt::UserRole + 1, /**< The delegate type of the message. */
+        EventIdRole, /**< The matrix event ID of the event. */
+        TimeRole, /**< The timestamp for when the event was sent (as a QDateTime). */
+        SectionRole, /**< The date of the event as a string. */
+        AuthorRole, /**< The author of the event. */
+        HighlightRole, /**< Whether the event should be highlighted. */
+        SpecialMarksRole, /**< Whether the event is hidden or not. */
+        ProgressInfoRole, /**< Progress info when downloading files. */
+        GenericDisplayRole, /**< A generic string based upon the message type. */
+        MediaInfoRole, /**< The media info for the event. */
+
+        ContentModelRole, /**< The MessageContentModel for the event. */
+
+        IsThreadedRole, /**< Whether the message is in a thread. */
+        ThreadRootRole, /**< The Matrix ID of the thread root message, if any . */
+
+        ShowSectionRole, /**< Whether the section header should be shown. */
+
+        ReadMarkersRole, /**< The first 5 other users at the event for read marker tracking. */
+        ShowReadMarkersRole, /**< Whether there are any other user read markers to be shown. */
+        ReactionRole, /**< List model for this event. */
+        ShowReactionsRole, /**< Whether there are any reactions to be shown. */
+
+        VerifiedRole, /**< Whether an encrypted message is sent in a verified session. */
+        AuthorDisplayNameRole, /**< The displayname for the event's sender; for name change events, the old displayname. */
+        IsRedactedRole, /**< Whether an event has been deleted. */
+        IsPendingRole, /**< Whether an event is waiting to be accepted by the server. */
+        IsEditableRole, /**< Whether the event can be edited by the user. */
+        LastRole, // Keep this last
+    };
+    Q_ENUM(EventRoles)
+
+    explicit TimelineMessageModel(QObject *parent = nullptr);
+
+    /**
+     * @brief Number of rows in the model.
+     *
+     * @sa  QAbstractItemModel::rowCount
+     */
+    [[nodiscard]] int rowCount(const QModelIndex &parent = QModelIndex()) const override;
+
+private:
+    void connectNewRoom();
+
+    std::optional<std::reference_wrapper<const Quotient::RoomEvent>> getEventForIndex(QModelIndex index) const override;
+
+    int rowBelowInserted = -1;
+    bool resetting = false;
+    bool movingEvent = false;
+
+    int timelineServerIndex() const override;
+
+    bool canFetchMore(const QModelIndex &parent) const override;
+    void fetchMore(const QModelIndex &parent) override;
+
+    void moveReadMarker(const QString &toEventId);
+
+    // Hack to ensure that we don't call endInsertRows when we haven't called beginInsertRows
+    bool m_initialized = false;
+};