diff --git a/src/timeline/EventDelegateChooser.cpp b/src/timeline/EventDelegateChooser.cpp
new file mode 100644
index 00000000..99a4cf3a
--- /dev/null
+++ b/src/timeline/EventDelegateChooser.cpp
@@ -0,0 +1,360 @@
+// SPDX-FileCopyrightText: Nheko Contributors
+//
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#include "EventDelegateChooser.h"
+#include "TimelineModel.h"
+
+#include "Logging.h"
+
+#include <QQmlEngine>
+#include <QtGlobal>
+
+#include <ranges>
+
+// privat qt headers to access required properties
+#include <QtQml/private/qqmlincubator_p.h>
+#include <QtQml/private/qqmlobjectcreator_p.h>
+
+QQmlComponent *
+EventDelegateChoice::delegate() const
+{
+ return delegate_;
+}
+
+void
+EventDelegateChoice::setDelegate(QQmlComponent *delegate)
+{
+ if (delegate != delegate_) {
+ delegate_ = delegate;
+ emit delegateChanged();
+ emit changed();
+ }
+}
+
+QList<int>
+EventDelegateChoice::roleValues() const
+{
+ return roleValues_;
+}
+
+void
+EventDelegateChoice::setRoleValues(const QList<int> &value)
+{
+ if (value != roleValues_) {
+ roleValues_ = value;
+ emit roleValuesChanged();
+ emit changed();
+ }
+}
+
+QQmlListProperty<EventDelegateChoice>
+EventDelegateChooser::choices()
+{
+ return QQmlListProperty<EventDelegateChoice>(this,
+ this,
+ &EventDelegateChooser::appendChoice,
+ &EventDelegateChooser::choiceCount,
+ &EventDelegateChooser::choice,
+ &EventDelegateChooser::clearChoices);
+}
+
+void
+EventDelegateChooser::appendChoice(QQmlListProperty<EventDelegateChoice> *p, EventDelegateChoice *c)
+{
+ EventDelegateChooser *dc = static_cast<EventDelegateChooser *>(p->object);
+ dc->choices_.append(c);
+}
+
+qsizetype
+EventDelegateChooser::choiceCount(QQmlListProperty<EventDelegateChoice> *p)
+{
+ return static_cast<EventDelegateChooser *>(p->object)->choices_.count();
+}
+EventDelegateChoice *
+EventDelegateChooser::choice(QQmlListProperty<EventDelegateChoice> *p, qsizetype index)
+{
+ return static_cast<EventDelegateChooser *>(p->object)->choices_.at(index);
+}
+void
+EventDelegateChooser::clearChoices(QQmlListProperty<EventDelegateChoice> *p)
+{
+ static_cast<EventDelegateChooser *>(p->object)->choices_.clear();
+}
+
+void
+EventDelegateChooser::componentComplete()
+{
+ QQuickItem::componentComplete();
+ eventIncubator.reset(eventId_);
+ replyIncubator.reset(replyId);
+ // eventIncubator.forceCompletion();
+}
+
+void
+EventDelegateChooser::DelegateIncubator::setInitialState(QObject *obj)
+{
+ auto item = qobject_cast<QQuickItem *>(obj);
+ if (!item)
+ return;
+
+ item->setParentItem(&chooser);
+ item->setParent(&chooser);
+
+ auto roleNames = chooser.room_->roleNames();
+ QHash<QByteArray, int> nameToRole;
+ for (const auto &[k, v] : roleNames.asKeyValueRange()) {
+ nameToRole.insert(v, k);
+ }
+
+ QHash<int, int> roleToPropIdx;
+ std::vector<QModelRoleData> roles;
+ // Workaround for https://bugreports.qt.io/browse/QTBUG-98846
+ QHash<QString, RequiredPropertyKey> requiredProperties;
+ for (const auto &[propKey, prop] :
+ QQmlIncubatorPrivate::get(this)->requiredProperties()->asKeyValueRange()) {
+ requiredProperties.insert(prop.propertyName, propKey);
+ }
+
+ // collect required properties
+ auto mo = obj->metaObject();
+ for (int i = 0; i < mo->propertyCount(); i++) {
+ auto prop = mo->property(i);
+ // nhlog::ui()->critical("Found prop {}", prop.name());
+ // See https://bugreports.qt.io/browse/QTBUG-98846
+ if (!prop.isRequired() && !requiredProperties.contains(prop.name()))
+ continue;
+
+ if (auto role = nameToRole.find(prop.name()); role != nameToRole.end()) {
+ roleToPropIdx.insert(*role, i);
+ roles.emplace_back(*role);
+
+ // nhlog::ui()->critical("Found prop {}, idx {}, role {}", prop.name(), i, *role);
+ } else {
+ nhlog::ui()->critical("Required property {} not found in model!", prop.name());
+ }
+ }
+
+ // nhlog::ui()->debug("Querying data for id {}", currentId.toStdString());
+ chooser.room_->multiData(currentId, forReply ? chooser.eventId_ : QString(), roles);
+
+ Qt::beginPropertyUpdateGroup();
+ auto attached = qobject_cast<EventDelegateChooserAttachedType *>(
+ qmlAttachedPropertiesObject<EventDelegateChooser>(obj));
+ Q_ASSERT(attached != nullptr);
+ attached->setIsReply(this->forReply);
+
+ for (const auto &role : roles) {
+ const auto &roleName = roleNames[role.role()];
+ // nhlog::ui()->critical("Setting role {}, {} to {}",
+ // role.role(),
+ // roleName.toStdString(),
+ // role.data().toString().toStdString());
+
+ // nhlog::ui()->critical("Setting {}", mo->property(roleToPropIdx[role.role()]).name());
+ mo->property(roleToPropIdx[role.role()]).write(obj, role.data());
+
+ if (const auto &req = requiredProperties.find(roleName); req != requiredProperties.end())
+ QQmlIncubatorPrivate::get(this)->requiredProperties()->remove(*req);
+ }
+
+ Qt::endPropertyUpdateGroup();
+
+ // setInitialProperties(rolesToSet);
+
+ auto update =
+ [this, obj, roleToPropIdx = std::move(roleToPropIdx)](const QList<int> &changedRoles) {
+ if (changedRoles.empty() || changedRoles.contains(TimelineModel::Roles::Type)) {
+ int type = chooser.room_
+ ->dataById(currentId,
+ TimelineModel::Roles::Type,
+ forReply ? chooser.eventId_ : QString())
+ .toInt();
+ if (type != oldType) {
+ // nhlog::ui()->debug("Type changed!");
+ reset(currentId);
+ return;
+ }
+ }
+
+ std::vector<QModelRoleData> rolesToRequest;
+
+ if (changedRoles.empty()) {
+ for (const auto role :
+ std::ranges::subrange(roleToPropIdx.keyBegin(), roleToPropIdx.keyEnd()))
+ rolesToRequest.emplace_back(role);
+ } else {
+ for (auto role : changedRoles) {
+ if (roleToPropIdx.contains(role)) {
+ rolesToRequest.emplace_back(role);
+ }
+ }
+ }
+
+ if (rolesToRequest.empty())
+ return;
+
+ auto mo = obj->metaObject();
+ chooser.room_->multiData(
+ currentId, forReply ? chooser.eventId_ : QString(), rolesToRequest);
+
+ Qt::beginPropertyUpdateGroup();
+ for (const auto &role : rolesToRequest) {
+ mo->property(roleToPropIdx[role.role()]).write(obj, role.data());
+ }
+ Qt::endPropertyUpdateGroup();
+ };
+
+ if (!forReply) {
+ auto row = chooser.room_->idToIndex(currentId);
+ auto connection = connect(
+ chooser.room_,
+ &QAbstractItemModel::dataChanged,
+ obj,
+ [row, update](const QModelIndex &topLeft,
+ const QModelIndex &bottomRight,
+ const QList<int> &changedRoles) {
+ if (row < topLeft.row() || row > bottomRight.row())
+ return;
+
+ update(changedRoles);
+ },
+ Qt::QueuedConnection);
+ connect(&this->chooser, &EventDelegateChooser::destroyed, obj, [connection]() {
+ QObject::disconnect(connection);
+ });
+ }
+}
+
+void
+EventDelegateChooser::DelegateIncubator::reset(QString id)
+{
+ if (!chooser.room_ || id.isEmpty())
+ return;
+
+ // nhlog::ui()->debug("Reset with id {}, reply {}", id.toStdString(), forReply);
+
+ this->currentId = id;
+
+ auto role =
+ chooser.room_
+ ->dataById(id, TimelineModel::Roles::Type, forReply ? chooser.eventId_ : QString())
+ .toInt();
+ this->oldType = role;
+
+ for (const auto choice : std::as_const(chooser.choices_)) {
+ const auto &choiceValue = choice->roleValues();
+ if (choiceValue.contains(role) || choiceValue.empty()) {
+ // nhlog::ui()->debug(
+ // "Instantiating type: {}, c {}", (int)role, choiceValue.contains(role));
+
+ if (auto child = qobject_cast<QQuickItem *>(object())) {
+ child->setParentItem(nullptr);
+ }
+
+ choice->delegate()->create(*this, QQmlEngine::contextForObject(&chooser));
+ return;
+ }
+ }
+}
+
+void
+EventDelegateChooser::DelegateIncubator::statusChanged(QQmlIncubator::Status status)
+{
+ if (status == QQmlIncubator::Ready) {
+ auto child = qobject_cast<QQuickItem *>(object());
+ if (child == nullptr) {
+ nhlog::ui()->error("Delegate has to be derived of Item!");
+ return;
+ }
+
+ child->setParentItem(&chooser);
+ QQmlEngine::setObjectOwnership(child, QQmlEngine::ObjectOwnership::CppOwnership);
+
+ // connect(child, &QQuickItem::parentChanged, child, [child](QQuickItem *) {
+ // // QTBUG-115687
+ // if (child->flags().testFlag(QQuickItem::ItemObservesViewport)) {
+ // nhlog::ui()->critical("SETTING OBSERVES VIEWPORT");
+ // // Re-trigger the parent traversal to get subtreeTransformChangedEnabled turned
+ // on child->setFlag(QQuickItem::ItemObservesViewport);
+ // }
+ // });
+
+ if (forReply)
+ emit chooser.replyChanged();
+ else
+ emit chooser.mainChanged();
+
+ chooser.polish();
+ } else if (status == QQmlIncubator::Error) {
+ auto errors_ = errors();
+ for (const auto &e : std::as_const(errors_))
+ nhlog::ui()->error("Error instantiating delegate: {}", e.toString().toStdString());
+ }
+}
+
+void
+EventDelegateChooser::updatePolish()
+{
+ auto mainChild = qobject_cast<QQuickItem *>(eventIncubator.object());
+ auto replyChild = qobject_cast<QQuickItem *>(replyIncubator.object());
+
+ // nhlog::ui()->trace("POLISHING {}", (void *)this);
+
+ auto layoutItem = [this](QQuickItem *item, int inset) {
+ if (item) {
+ QObject::disconnect(item, &QQuickItem::implicitWidthChanged, this, &QQuickItem::polish);
+
+ auto attached = qobject_cast<EventDelegateChooserAttachedType *>(
+ qmlAttachedPropertiesObject<EventDelegateChooser>(item));
+ Q_ASSERT(attached != nullptr);
+
+ int maxWidth = maxWidth_ - inset;
+
+ // in theory we could also reset the width, but that doesn't seem to work nicely for
+ // text areas because of how they cache it.
+ if (attached->maxWidth() > 0)
+ item->setWidth(attached->maxWidth());
+ else
+ item->setWidth(maxWidth);
+ item->ensurePolished();
+ auto width = item->implicitWidth();
+
+ if (width < 1 || width > maxWidth)
+ width = maxWidth;
+
+ if (attached->maxWidth() > 0 && width > attached->maxWidth())
+ width = attached->maxWidth();
+
+ if (attached->keepAspectRatio()) {
+ auto height = width * attached->aspectRatio();
+ if (attached->maxHeight() && height > attached->maxHeight()) {
+ height = attached->maxHeight();
+ width = height / attached->aspectRatio();
+ }
+
+ item->setHeight(height);
+ }
+
+ item->setWidth(width);
+ item->ensurePolished();
+
+ QObject::connect(item, &QQuickItem::implicitWidthChanged, this, &QQuickItem::polish);
+ }
+ };
+
+ layoutItem(mainChild, mainInset_);
+ layoutItem(replyChild, replyInset_);
+}
+
+void
+EventDelegateChooserAttachedType::polishChooser()
+{
+ auto p = parent();
+ if (p) {
+ auto chooser = qobject_cast<EventDelegateChooser *>(p->parent());
+ if (chooser) {
+ chooser->polish();
+ }
+ }
+}
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