Move all timeline relevant models and classes to the module

src/timeline/enums/delegatetype.h

@@ -0,0 +1,70 @@
+// SPDX-FileCopyrightText: 2023 James Graham <james.h.graham@protonmail.com>
+// SPDX-License-Identifier: GPL-2.0-only OR GPL-3.0-only OR LicenseRef-KDE-Accepted-GPL
+
+#pragma once
+
+#include <QObject>
+#include <QQmlEngine>
+
+#include <Quotient/events/encryptedevent.h>
+#include <Quotient/events/roomevent.h>
+#include <Quotient/events/roommessageevent.h>
+#include <Quotient/events/stickerevent.h>
+
+#include "events/pollevent.h"
+
+using namespace Qt::StringLiterals;
+
+/**
+ * @class DelegateType
+ *
+ * This class is designed to define the DelegateType enumeration.
+ */
+class DelegateType : public QObject
+{
+    Q_OBJECT
+    QML_ELEMENT
+    QML_UNCREATABLE("")
+
+public:
+    /**
+     * @brief The type of delegate that is needed for the event.
+     *
+     * @note While similar this is not the matrix event or message type. This is
+     *       to tell a QML ListView what delegate to show for each event. So while
+     *       similar to the spec it is not the same.
+     */
+    enum Type {
+        Message, /**< A text message. */
+        State, /**< A state event in the room. */
+        ReadMarker, /**< The local user read marker. */
+        Loading, /**< A delegate to tell the user more messages are being loaded. */
+        TimelineEnd, /**< A delegate to inform that all messages are loaded. */
+        Predecessor, /**< A delegate to show a room predecessor. */
+        Successor, /**< A delegate to show a room successor. */
+        Other, /**< Anything that cannot be classified as another type. */
+    };
+    Q_ENUM(Type);
+
+    /**
+     * @brief Return the delegate type for the given event.
+     *
+     * @param event the event to return a type for.
+     *
+     * @sa Type
+     */
+    static Type typeForEvent(const Quotient::RoomEvent &event)
+    {
+        if (event.is<Quotient::RoomMessageEvent>() || event.is<Quotient::StickerEvent>() || event.is<Quotient::EncryptedEvent>()
+            || event.is<Quotient::PollStartEvent>()) {
+            return Message;
+        }
+        if (event.isStateEvent()) {
+            if (event.matrixType() == u"org.matrix.msc3672.beacon_info"_s) {
+                return Message;
+            }
+            return State;
+        }
+        return Other;
+    }
+};