diff --git a/src/editor/dialogs/addeventdialog.cpp b/src/editor/dialogs/addeventdialog.cpp
index e99610b..e994f9f 100644
--- a/src/editor/dialogs/addeventdialog.cpp
+++ b/src/editor/dialogs/addeventdialog.cpp
@@ -2,9 +2,13 @@
 #include "ui_addeventdialog.h"
 
 #include <QMessageBox>
+#include <QMenu>
 
-AddEventDialog::AddEventDialog(QWidget *parent) :
+#include "models/projecttreemodel.h"
+
+AddEventDialog::AddEventDialog(ProjectTreeModel &projectModel, QWidget *parent) :
     QDialog{parent},
+    m_projectModel{projectModel},
     m_ui{std::make_unique<Ui::AddEventDialog>()}
 {
     m_ui->setupUi(this);
@@ -27,6 +31,29 @@ AddEventDialog::AddEventDialog(QWidget *parent) :
             this, [this](){ m_eventType = Object::EventType::Draw; accept(); });
     connect(m_ui->pushButtonStep, &QAbstractButton::clicked,
             this, [this](){ m_eventType = Object::EventType::Step; accept(); });
+
+    auto menu = new QMenu;
+    connect(menu, &QMenu::aboutToShow, menu, [this,menu](){
+        for (const Object &object : m_projectModel.project()->objects)
+        {
+            QIcon icon;
+            if (!object.spriteName.isEmpty())
+            {
+                const auto &sprites = m_projectModel.project()->sprites;
+                const auto iter = std::find_if(std::cbegin(sprites), std::cend(sprites),
+                                               [&](const Sprite &sprite){ return sprite.name == object.spriteName; });
+                if (iter != std::cend(sprites))
+                {
+                    if (!iter->pixmaps.empty())
+                        icon = iter->pixmaps.front();
+                }
+            }
+            menu->addAction(icon, object.name, this, [this,&object](){
+                m_eventType = object.name; accept();
+            });
+        }
+    }, Qt::SingleShotConnection);
+    m_ui->pushButtonCollision->setMenu(menu);
 }
 
 AddEventDialog::~AddEventDialog() = default;
diff --git a/src/editor/dialogs/addeventdialog.h b/src/editor/dialogs/addeventdialog.h
index 3b88fd6..ce4c23b 100644
--- a/src/editor/dialogs/addeventdialog.h
+++ b/src/editor/dialogs/addeventdialog.h
@@ -3,26 +3,31 @@
 #include <QDialog>
 
 #include <optional>
+#include <variant>
 
 #include "projectcontainer.h"
 
 namespace Ui { class AddEventDialog; }
 
+class ProjectTreeModel;
+
 class AddEventDialog : public QDialog
 {
     Q_OBJECT
 
 public:
-    explicit AddEventDialog(QWidget *parent = nullptr);
+    explicit AddEventDialog(ProjectTreeModel &projectModel, QWidget *parent = nullptr);
     ~AddEventDialog();
 
-    Object::EventType eventType() const { return *m_eventType; }
+    const std::optional<std::variant<Object::EventType, QString>> &eventType() const { return m_eventType; }
 
     void accept() override;
     void reject() override;
 
 private:
+    ProjectTreeModel &m_projectModel;
+
     const std::unique_ptr<Ui::AddEventDialog> m_ui;
 
-    std::optional<Object::EventType> m_eventType;
+    std::optional<std::variant<Object::EventType, QString>> m_eventType;
 };
diff --git a/src/editor/dialogs/addeventdialog.ui b/src/editor/dialogs/addeventdialog.ui
index bfd4e6b..3d4e022 100644
--- a/src/editor/dialogs/addeventdialog.ui
+++ b/src/editor/dialogs/addeventdialog.ui
@@ -7,7 +7,7 @@
     <x>0</x>
     <y>0</y>
     <width>265</width>
-    <height>221</height>
+    <height>238</height>
    </rect>
   </property>
   <property name="windowTitle">
@@ -82,6 +82,10 @@
        <property name="text">
         <string>C&amp;ollision</string>
        </property>
+       <property name="icon">
+        <iconset resource="../resources_editor.qrc">
+         <normaloff>:/qtgameengine/icons/event-collision.png</normaloff>:/qtgameengine/icons/event-collision.png</iconset>
+       </property>
       </widget>
      </item>
      <item row="1" column="0">
diff --git a/src/editor/dialogs/objectpropertiesdialog.cpp b/src/editor/dialogs/objectpropertiesdialog.cpp
index ed1fae6..def3293 100644
--- a/src/editor/dialogs/objectpropertiesdialog.cpp
+++ b/src/editor/dialogs/objectpropertiesdialog.cpp
@@ -19,7 +19,8 @@ ObjectPropertiesDialog::ObjectPropertiesDialog(Object &object, ProjectTreeModel
     m_projectModel{projectModel},
     m_mainWindow{mainWindow},
     m_events{m_object.events},
-    m_eventsModel{std::make_unique<ObjectEventsModel>(m_events)},
+    m_collisionEvents{m_object.collisionEvents},
+    m_eventsModel{std::make_unique<ObjectEventsModel>(m_events, m_collisionEvents)},
     m_menuSprites{new QMenu{this}},
     m_spriteName{object.spriteName}
 {
@@ -132,6 +133,7 @@ void ObjectPropertiesDialog::accept()
     m_object.depth = m_ui->spinBoxDepth->value();
     m_object.persistent = m_ui->checkBoxPersistent->isChecked();
     m_object.events = std::move(m_events);
+    m_object.collisionEvents = std::move(m_collisionEvents);
 
     QDialog::accept();
 }
@@ -204,12 +206,11 @@ void ObjectPropertiesDialog::showInformation()
 
 void ObjectPropertiesDialog::addEvent()
 {
-    AddEventDialog dialog{this};
+    AddEventDialog dialog{m_projectModel, this};
     if (dialog.exec() == QDialog::Accepted)
-    {
-        if (!m_eventsModel->addEvent(dialog.eventType()))
-            QMessageBox::warning(this, tr("Could not add Event!"), tr("Could not add Event!"));
-    }
+        if (const auto &eventType = dialog.eventType())
+            if (!m_eventsModel->addEvent(*eventType))
+                QMessageBox::warning(this, tr("Could not add Event!"), tr("Could not add Event!"));
 }
 
 void ObjectPropertiesDialog::deleteEvent()
@@ -235,12 +236,13 @@ void ObjectPropertiesDialog::replaceEvent()
     if (!event)
         return;
 
-    AddEventDialog dialog{this};
+    std::variant<Object::EventType, QString> x = event->first;
+
+    AddEventDialog dialog{m_projectModel, this};
     if (dialog.exec() == QDialog::Accepted)
-    {
-        if (!m_eventsModel->changeEvent(event->first, dialog.eventType()))
+        if (const auto &eventType = dialog.eventType())
+        if (!m_eventsModel->changeEvent(event->first, *eventType))
             QMessageBox::warning(this, tr("Could not change Event!"), tr("Could not change Event!"));
-    }
 }
 
 void ObjectPropertiesDialog::duplicateEvent()
@@ -329,7 +331,7 @@ void ObjectPropertiesDialog::currentEventChanged(const QModelIndex &index)
     if (index.isValid())
     {
         if (auto event = m_eventsModel->getEvent(index))
-            m_ui->actionsWidget->setActionsContainer(&event->second);
+            m_ui->actionsWidget->setActionsContainer(&event->second.get());
         else
             goto none;
     }
@@ -343,13 +345,13 @@ none:
 void ObjectPropertiesDialog::eventsContextMenuRequested(const QPoint &pos)
 {
     const auto index = m_ui->listViewEvents->indexAt(pos);
-    auto event = index.isValid() ? m_eventsModel->getEvent(index) : nullptr;
+    auto event = index.isValid() ? m_eventsModel->getEvent(index) : std::nullopt;
 
     QMenu menu{this};
     menu.addAction(tr("&Add Event"), this, &ObjectPropertiesDialog::addEvent);
-    menu.addAction(tr("&Change Event"), this, &ObjectPropertiesDialog::replaceEvent)->setEnabled(event);
-    menu.addAction(tr("&Duplicate Event"), this, &ObjectPropertiesDialog::duplicateEvent)->setEnabled(event);
-    menu.addAction(tr("D&elete Event"), this, &ObjectPropertiesDialog::deleteEvent)->setEnabled(event);
+    menu.addAction(tr("&Change Event"), this, &ObjectPropertiesDialog::replaceEvent)->setEnabled(event.has_value());
+    menu.addAction(tr("&Duplicate Event"), this, &ObjectPropertiesDialog::duplicateEvent)->setEnabled(event.has_value());
+    menu.addAction(tr("D&elete Event"), this, &ObjectPropertiesDialog::deleteEvent)->setEnabled(event.has_value());
     menu.exec(m_ui->listViewEvents->viewport()->mapToGlobal(pos));
 }
 
diff --git a/src/editor/dialogs/objectpropertiesdialog.h b/src/editor/dialogs/objectpropertiesdialog.h
index 8f6fc61..c470629 100644
--- a/src/editor/dialogs/objectpropertiesdialog.h
+++ b/src/editor/dialogs/objectpropertiesdialog.h
@@ -60,6 +60,7 @@ private:
     MainWindow * const m_mainWindow;
 
     Object::events_container_t m_events;
+    Object::collision_events_container_t m_collisionEvents;
 
     const std::unique_ptr<ObjectEventsModel> m_eventsModel;
 
diff --git a/src/editor/dialogs/roompropertiesdialog.cpp b/src/editor/dialogs/roompropertiesdialog.cpp
index 1bc89bd..41e78d1 100644
--- a/src/editor/dialogs/roompropertiesdialog.cpp
+++ b/src/editor/dialogs/roompropertiesdialog.cpp
@@ -343,29 +343,35 @@ void RoomPropertiesDialog::spritePixmapsChanged(const Sprite &sprite)
     m_ui->labelObjectPreview->setPixmap(std::move(pixmap));
 }
 
-void RoomPropertiesDialog::objectNameChanged(const Object &object)
+void RoomPropertiesDialog::objectNameChanged(const Object &object, const QString &oldName)
 {
-    if (!m_selectedObject)
-        return;
+    if (m_selectedObject && &object == m_selectedObject)
+        m_ui->lineEditObject->setText(object.name);
 
-    if (&object != m_selectedObject)
-        return;
+    for (auto &obj : m_objects)
+    {
+        if (obj.objectName != oldName)
+            continue;
 
-    m_ui->lineEditObject->setText(object.name);
+        obj.objectName = object.name;
+    }
 }
 
 void RoomPropertiesDialog::objectAboutToBeRemoved(const Object &object)
 {
-    if (!m_selectedObject)
-        return;
+    if (m_selectedObject && &object == m_selectedObject)
+    {
+        m_selectedObject = nullptr;
+        m_ui->lineEditObject->clear();
+        m_ui->labelObjectPreview->setPixmap({});
+        m_ui->roomEditWidget->setSelectedObject(nullptr);
+    }
 
-    if (&object != m_selectedObject)
-        return;
-
-    m_selectedObject = nullptr;
-    m_ui->lineEditObject->clear();
-    m_ui->labelObjectPreview->setPixmap({});
-    m_ui->roomEditWidget->setSelectedObject(nullptr);
+    for (auto iter = std::begin(m_objects); iter != std::end(m_objects);)
+        if (iter->objectName == object.name)
+            iter = m_objects.erase(iter);
+        else
+            iter++;
 }
 
 void RoomPropertiesDialog::objectSpriteNameChanged(const Object &object)
diff --git a/src/editor/dialogs/roompropertiesdialog.h b/src/editor/dialogs/roompropertiesdialog.h
index ddb02b1..1d551e8 100644
--- a/src/editor/dialogs/roompropertiesdialog.h
+++ b/src/editor/dialogs/roompropertiesdialog.h
@@ -41,7 +41,7 @@ private slots:
 
     void roomNameChanged(const Room &room);
     void spritePixmapsChanged(const Sprite &sprite);
-    void objectNameChanged(const Object &object);
+    void objectNameChanged(const Object &object, const QString &oldName);
     void objectAboutToBeRemoved(const Object &object);
     void objectSpriteNameChanged(const Object &object);
 
diff --git a/src/editor/icons/event-collision.png b/src/editor/icons/event-collision.png
new file mode 100644
index 0000000..c8a0c48
Binary files /dev/null and b/src/editor/icons/event-collision.png differ
diff --git a/src/editor/models/objecteventsmodel.cpp b/src/editor/models/objecteventsmodel.cpp
index 3e26084..afc1acf 100644
--- a/src/editor/models/objecteventsmodel.cpp
+++ b/src/editor/models/objecteventsmodel.cpp
@@ -5,56 +5,78 @@
 
 #include "futurecpp.h"
 
-ObjectEventsModel::ObjectEventsModel(Object::events_container_t &events, QObject *parent) :
+ObjectEventsModel::ObjectEventsModel(Object::events_container_t &events, Object::collision_events_container_t &collisionEvents,
+                                     QObject *parent) :
     QAbstractListModel{parent},
-    m_events{events}
+    m_events{events},
+    m_collisionEvents{collisionEvents}
 {
 }
 
 int ObjectEventsModel::rowCount(const QModelIndex &parent) const
 {
     Q_UNUSED(parent)
-    return m_events.size();
+    return m_events.size() + m_collisionEvents.size();
 }
 
 QVariant ObjectEventsModel::data(const QModelIndex &index, int role) const
 {
     Q_UNUSED(index)
 
-    if (index.row() < 0 || std::size_t(index.row()) >= m_events.size())
+    if (index.row() < 0)
     {
         qWarning() << "row out of bounds" << index.row();
         return {};
     }
-
-    const auto &pair = *std::next(std::cbegin(m_events), index.row());
-
-    switch (role)
+    else if (std::size_t(index.row()) < m_events.size())
     {
-    case Qt::DisplayRole:
-    case Qt::EditRole:
-        switch (pair.first)
+        const auto &pair = *std::next(std::cbegin(m_events), index.row());
+
+        switch (role)
         {
-        case Object::EventType::Create:  return tr("Create");
-        case Object::EventType::Destroy: return tr("Destroy");
-        case Object::EventType::Step:    return tr("Step");
-        case Object::EventType::Draw:    return tr("Draw");
-        default:
-            qWarning() << "unknown event type" << std::to_underlying(pair.first);
-            return QString::number(std::to_underlying(pair.first));
+        case Qt::DisplayRole:
+        case Qt::EditRole:
+            switch (pair.first)
+            {
+            case Object::EventType::Create:  return tr("Create");
+            case Object::EventType::Destroy: return tr("Destroy");
+            case Object::EventType::Step:    return tr("Step");
+            case Object::EventType::Draw:    return tr("Draw");
+            default:
+                qWarning() << "unknown event type" << std::to_underlying(pair.first);
+                return QString::number(std::to_underlying(pair.first));
+            }
+        case Qt::DecorationRole:
+            switch (pair.first)
+            {
+            case Object::EventType::Create:  return QIcon{":/qtgameengine/icons/event-create.png"};
+            case Object::EventType::Destroy: return QIcon{":/qtgameengine/icons/event-destroy.png"};
+            case Object::EventType::Step:    return QIcon{":/qtgameengine/icons/event-step.png"};
+            case Object::EventType::Draw:    return QIcon{":/qtgameengine/icons/event-draw.png"};
+            default:
+                qWarning() << "unknown event type" << std::to_underlying(pair.first);
+                return {};
+            }
         }
-    case Qt::DecorationRole:
-        switch (pair.first)
+    }
+    else if (std::size_t(index.row()) < m_collisionEvents.size() + m_events.size())
+    {
+        const auto &pair = *std::next(std::cbegin(m_collisionEvents), index.row() - m_events.size());
+
+        switch (role)
         {
-        case Object::EventType::Create:  return QIcon{":/qtgameengine/icons/event-create.png"};
-        case Object::EventType::Destroy: return QIcon{":/qtgameengine/icons/event-destroy.png"};
-        case Object::EventType::Step:    return QIcon{":/qtgameengine/icons/event-step.png"};
-        case Object::EventType::Draw:    return QIcon{":/qtgameengine/icons/event-draw.png"};
-        default:
-            qWarning() << "unknown event type" << std::to_underlying(pair.first);
-            return {};
+        case Qt::DisplayRole:
+        case Qt::EditRole:
+            return pair.first;
+        case Qt::DecorationRole:
+            return QIcon{":/qtgameengine/icons/event-collision.png"};
         }
     }
+    else
+    {
+        qWarning() << "row out of bounds" << index.row();
+        return {};
+    }
 
     return {};
 }
@@ -63,27 +85,62 @@ bool ObjectEventsModel::removeRows(int row, int count, const QModelIndex &parent
 {
     Q_UNUSED(parent)
 
-    if (row < 0 || std::size_t(row) >= m_events.size())
+    if (row < 0 || std::size_t(row) >= m_events.size() + m_collisionEvents.size())
     {
         qWarning() << "unexpected row" << row;
         return false;
     }
 
-    if (count < 0 || std::size_t(count) > m_events.size() - row)
+    if (count < 0 || std::size_t(count) > m_events.size() + m_collisionEvents.size() - row)
     {
         qWarning() << "unexpected row+count" << count << row;
         return false;
     }
 
     beginRemoveRows({}, row, row + count - 1);
-    auto begin = std::next(std::begin(m_events), row);
-    auto end = std::next(begin, count);
-    m_events.erase(begin, end);
+
+    if (std::size_t(row) < m_events.size())
+    {
+        const auto remaining = m_events.size() - row;
+        const auto begin = std::next(std::begin(m_events), row);
+        const auto end = std::next(begin, std::min<std::size_t>(count, remaining));
+        m_events.erase(begin, end);
+
+        if (std::size_t(count) > remaining)
+        {
+            count -= remaining;
+
+            const auto begin = std::begin(m_collisionEvents);
+            const auto end = std::next(begin, count);
+            m_collisionEvents.erase(begin, end);
+        }
+    }
+    else if (std::size_t(row) < m_events.size() + m_collisionEvents.size())
+    {
+        qDebug() << row - m_events.size();
+        qDebug() << count;
+        qDebug() << m_collisionEvents.size();
+
+        const auto begin = std::next(std::begin(m_collisionEvents), row - m_events.size());
+        const auto end = std::next(begin, count);
+        m_collisionEvents.erase(begin, end);
+    }
+
     endRemoveRows();
 
     return true;
 }
 
+bool ObjectEventsModel::addEvent(std::variant<Object::EventType, QString> eventType)
+{
+    if (const auto &type = std::get_if<Object::EventType>(&eventType))
+        return addEvent(*type);
+    if (const auto &object = std::get_if<QString>(&eventType))
+        return addEvent(*object);
+    qCritical() << "not implemented";
+    return false;
+}
+
 bool ObjectEventsModel::addEvent(Object::EventType eventType)
 {
     if (m_events.contains(eventType))
@@ -122,6 +179,72 @@ bool ObjectEventsModel::addEvent(Object::EventType eventType)
     return true;
 }
 
+bool ObjectEventsModel::addEvent(const QString &object)
+{
+    if (m_collisionEvents.contains(object))
+    {
+        qWarning() << object << "duplicate";
+        return false;
+    }
+
+    // temporary copy to find row before inserting, as its needed for beginInsertRows()
+    auto tempevents = m_collisionEvents;
+
+    const auto &tempInsertResult = tempevents.insert(std::make_pair(object, ActionsContainer{}));
+    if (!tempInsertResult.second)
+    {
+        qWarning() << "temp inserting failed!";
+        return false;
+    }
+
+    const auto tempNewRow = std::distance(std::begin(tempevents), tempInsertResult.first);
+
+
+    beginInsertRows({}, tempNewRow + m_events.size(), tempNewRow + m_events.size());
+
+    const auto &insertResult = m_collisionEvents.insert(std::make_pair(object, ActionsContainer{}));
+    if (!insertResult.second)
+    {
+        qWarning() << "inserting failed!";
+        return false;
+    }
+
+    const auto newRow = std::distance(std::begin(m_collisionEvents), insertResult.first);
+    Q_ASSERT(tempNewRow == newRow);
+
+    endInsertRows();
+
+    return true;
+}
+
+bool ObjectEventsModel::changeEvent(std::variant<Object::EventType, QString> eventType, std::variant<Object::EventType, QString> newEventType)
+{
+    if (const auto &type = std::get_if<Object::EventType>(&eventType))
+    {
+        if (const auto &newType = std::get_if<Object::EventType>(&newEventType))
+            return changeEvent(*type, *newType);
+        if (const auto &newObject = std::get_if<QString>(&newEventType))
+        {
+            //return changeEvent(*type, *newObject);
+        }
+        qCritical() << "not implemented";
+        return false;
+    }
+    if (const auto &object = std::get_if<QString>(&eventType))
+    {
+        if (const auto &newType = std::get_if<Object::EventType>(&newEventType))
+        {
+            //return changeEvent(*object, *newType);
+        }
+        if (const auto &newObject = std::get_if<QString>(&newEventType))
+            return changeEvent(*object, *newObject);
+        qCritical() << "not implemented";
+        return false;
+    }
+    qCritical() << "not implemented";
+    return false;
+}
+
 bool ObjectEventsModel::changeEvent(Object::EventType eventType, Object::EventType newEventType)
 {
     const auto iter = m_events.find(eventType);
@@ -137,6 +260,12 @@ bool ObjectEventsModel::changeEvent(Object::EventType eventType, Object::EventTy
         return true;
     }
 
+    if (m_events.contains(newEventType))
+    {
+        qWarning() << std::to_underlying(eventType) << "duplicate";
+        return false;
+    }
+
     auto container = std::move(iter->second);
 
     const auto oldRow = std::distance(std::begin(m_events), iter);
@@ -175,6 +304,75 @@ bool ObjectEventsModel::changeEvent(Object::EventType eventType, Object::EventTy
     return true;
 }
 
+bool ObjectEventsModel::changeEvent(const QString &object, const QString &newObject)
+{
+    const auto iter = m_collisionEvents.find(object);
+    if (iter == std::cend(m_collisionEvents))
+    {
+        qWarning() << object << "not found";
+        return false;
+    }
+
+    if (object == newObject)
+    {
+        qWarning() << "same event again";
+        return true;
+    }
+
+    if (m_collisionEvents.contains(newObject))
+    {
+        qWarning() << newObject << "duplicate";
+        return false;
+    }
+
+    auto container = std::move(iter->second);
+
+    const auto oldRow = std::distance(std::begin(m_collisionEvents), iter);
+
+    beginRemoveRows({}, oldRow + m_events.size(), oldRow + m_events.size());
+    m_collisionEvents.erase(iter);
+    endRemoveRows();
+
+    // temporary copy to find row before inserting, as its needed for beginInsertRows()
+    auto tempevents = m_collisionEvents;
+
+    const auto &tempInsertResult = tempevents.insert(std::make_pair(newObject, ActionsContainer{}));
+    if (!tempInsertResult.second)
+    {
+        qWarning() << "temp inserting failed!";
+        return false;
+    }
+
+    const auto tempNewRow = std::distance(std::begin(tempevents), tempInsertResult.first);
+
+
+    beginInsertRows({}, tempNewRow + m_events.size(), tempNewRow + m_events.size());
+
+    const auto &insertResult = m_collisionEvents.insert(std::make_pair(newObject, std::move(container)));
+    if (!insertResult.second)
+    {
+        qWarning() << "inserting failed!";
+        return false;
+    }
+
+    const auto newRow = std::distance(std::begin(m_collisionEvents), insertResult.first);
+    Q_ASSERT(tempNewRow == newRow);
+
+    endInsertRows();
+
+    return true;
+}
+
+bool ObjectEventsModel::removeEvent(std::variant<Object::EventType, QString> eventType)
+{
+    if (const auto &type = std::get_if<Object::EventType>(&eventType))
+        return removeEvent(*type);
+    if (const auto &object = std::get_if<QString>(&eventType))
+        return removeEvent(*object);
+    qCritical() << "not implemented";
+    return false;
+}
+
 bool ObjectEventsModel::removeEvent(Object::EventType eventType)
 {
     const auto iter = m_events.find(eventType);
@@ -193,46 +391,79 @@ bool ObjectEventsModel::removeEvent(Object::EventType eventType)
     return true;
 }
 
-std::pair<const Object::EventType, ActionsContainer> *ObjectEventsModel::getEvent(const QModelIndex &index)
+bool ObjectEventsModel::removeEvent(const QString &object)
+{
+    Q_UNUSED(object);
+    qCritical() << "not implemented";
+    return false;
+}
+
+auto ObjectEventsModel::getEvent(const QModelIndex &index) -> get_event_result_t
 {
     if (!index.isValid())
     {
         qWarning() << "unexpected invalid index";
-        return nullptr;
+        return std::nullopt;
     }
 
     return getEvent(index.row());
 }
 
-const std::pair<const Object::EventType, ActionsContainer> *ObjectEventsModel::getEvent(const QModelIndex &index) const
+auto ObjectEventsModel::getEvent(const QModelIndex &index) const -> const_get_event_result_t
 {
     if (!index.isValid())
     {
         qWarning() << "unexpected invalid index";
-        return nullptr;
+        return std::nullopt;
     }
 
     return getEvent(index.row());
 }
 
-std::pair<const Object::EventType, ActionsContainer> *ObjectEventsModel::getEvent(int row)
+auto ObjectEventsModel::getEvent(int row) -> get_event_result_t
 {
-    if (row < 0 || std::size_t(row) >= m_events.size())
+    if (row < 0)
     {
         qWarning() << "unexpected row" << row;
-        return nullptr;
+        return std::nullopt;
     }
-
-    return &*std::next(std::begin(m_events), row);
-}
-
-const std::pair<const Object::EventType, ActionsContainer> *ObjectEventsModel::getEvent(int row) const
-{
-    if (row < 0 || std::size_t(row) >= m_events.size())
+    else if (std::size_t(row) < m_events.size())
+    {
+        auto iter = std::next(std::begin(m_events), row);
+        return std::make_pair(iter->first, std::ref(iter->second));
+    }
+    else if (std::size_t(row) < m_events.size() + m_collisionEvents.size())
+    {
+        auto iter = std::next(std::begin(m_collisionEvents), row - m_events.size());
+        return std::make_pair(iter->first, std::ref(iter->second));
+    }
+    else
     {
         qWarning() << "unexpected row" << row;
-        return nullptr;
+        return std::nullopt;
+    }
+}
+
+auto ObjectEventsModel::getEvent(int row) const -> const_get_event_result_t
+{
+    if (row < 0)
+    {
+        qWarning() << "unexpected row" << row;
+        return std::nullopt;
+    }
+    else if (std::size_t(row) >= m_events.size())
+    {
+        auto iter = std::next(std::cbegin(m_events), row);
+        return std::make_pair(iter->first, std::cref(iter->second));
+    }
+    else if (std::size_t(row) >= m_events.size() + m_collisionEvents.size())
+    {
+        auto iter = std::next(std::cbegin(m_collisionEvents), row - m_events.size());
+        return std::make_pair(iter->first, std::cref(iter->second));
+    }
+    else
+    {
+        qWarning() << "unexpected row" << row;
+        return std::nullopt;
     }
-
-    return &*std::next(std::cbegin(m_events), row);
 }
diff --git a/src/editor/models/objecteventsmodel.h b/src/editor/models/objecteventsmodel.h
index 0e542a9..5dba891 100644
--- a/src/editor/models/objecteventsmodel.h
+++ b/src/editor/models/objecteventsmodel.h
@@ -11,21 +11,32 @@ class ObjectEventsModel : public QAbstractListModel
     Q_OBJECT
 
 public:
-    explicit ObjectEventsModel(Object::events_container_t &events, QObject *parent = nullptr);
+    explicit ObjectEventsModel(Object::events_container_t &events, Object::collision_events_container_t &collisionEvents,
+                               QObject *parent = nullptr);
 
     int rowCount(const QModelIndex &parent) const override;
     QVariant data(const QModelIndex &index, int role) const override;
     bool removeRows(int row, int count, const QModelIndex &parent = QModelIndex{}) override;
 
+    bool addEvent(std::variant<Object::EventType, QString> eventType);
     bool addEvent(Object::EventType eventType);
+    bool addEvent(const QString &object);
+    bool changeEvent(std::variant<Object::EventType, QString> eventType, std::variant<Object::EventType, QString> newEventType);
     bool changeEvent(Object::EventType eventType, Object::EventType newEventType);
+    bool changeEvent(const QString &object, const QString &newObject);
+    bool removeEvent(std::variant<Object::EventType, QString> eventType);
     bool removeEvent(Object::EventType eventType);
+    bool removeEvent(const QString &object);
 
-    std::pair<const Object::EventType, ActionsContainer> *getEvent(const QModelIndex &index);
-    const std::pair<const Object::EventType, ActionsContainer> *getEvent(const QModelIndex &index) const;
-    std::pair<const Object::EventType, ActionsContainer> *getEvent(int row);
-    const std::pair<const Object::EventType, ActionsContainer> *getEvent(int row) const;
+    using get_event_result_t = std::optional<std::pair<std::variant<Object::EventType, QString>, std::reference_wrapper<ActionsContainer>>>;
+    using const_get_event_result_t = std::optional<std::pair<std::variant<Object::EventType, QString>, std::reference_wrapper<const ActionsContainer>>>;
+
+    get_event_result_t getEvent(const QModelIndex &index);
+    const_get_event_result_t getEvent(const QModelIndex &index) const;
+    get_event_result_t getEvent(int row);
+    const_get_event_result_t getEvent(int row) const;
 
 private:
     Object::events_container_t &m_events;
+    Object::collision_events_container_t &m_collisionEvents;
 };
diff --git a/src/editor/models/projecttreemodel.cpp b/src/editor/models/projecttreemodel.cpp
index d4cf477..839ad9e 100644
--- a/src/editor/models/projecttreemodel.cpp
+++ b/src/editor/models/projecttreemodel.cpp
@@ -959,6 +959,16 @@ template<> void ProjectTreeModel::onBeforeRemove<Sprite>(const Sprite &sprite)
     }
 }
 
+template<> void ProjectTreeModel::onBeforeRemove<Object>(const Object &object)
+{
+    for (auto &room : m_project->rooms)
+        for (auto iter = std::begin(room.objects); iter != std::end(room.objects); )
+            if (iter->objectName == object.name)
+                iter = room.objects.erase(iter);
+            else
+                iter++;
+}
+
 template<typename T> void ProjectTreeModel::onBeforeRename(const T &entry, const QString &newName)
 {
     Q_UNUSED(entry)
@@ -973,22 +983,38 @@ template<typename T> void ProjectTreeModel::onAfterRename(const T &entry, const
 
 template<> void ProjectTreeModel::onAfterRename<Sprite>(const Sprite &sprite, const QString &oldName)
 {
-    for (auto iter = std::begin(m_project->objects); iter != std::end(m_project->objects); iter++)
+    for (auto &object : m_project->objects)
     {
-        if (iter->spriteName != oldName)
+        if (object.spriteName != oldName)
             continue;
 
-        auto oldSpriteName = std::move(iter->spriteName);
+        auto oldSpriteName = std::move(object.spriteName);
 
-        iter->spriteName = sprite.name;
+        object.spriteName = sprite.name;
 
 //        const auto index = this->index(std::distance(std::begin(m_project->objects), iter), 0, rootFor<Object>());
 //        emit dataChanged(index, index, {Qt::DecorationRole});
 
-        emit objectSpriteNameChanged(*iter, std::move(oldSpriteName));
+        emit objectSpriteNameChanged(object, std::move(oldSpriteName));
     }
 }
 
+template<> void ProjectTreeModel::onAfterRename<Object>(const Object &object, const QString &oldName)
+{
+    for (auto &room : m_project->rooms)
+    {
+        for (auto &obj : room.objects)
+        {
+            if (obj.objectName != oldName)
+                continue;
+
+            obj.objectName = object.name;
+        }
+    }
+
+    // TODO object collision events
+}
+
 template<typename T>
 QString ProjectTreeModel::getFreeNameFor(const std::list<T> &container)
 {
diff --git a/src/editor/resources_editor.qrc b/src/editor/resources_editor.qrc
index 8a7be93..c2f0725 100644
--- a/src/editor/resources_editor.qrc
+++ b/src/editor/resources_editor.qrc
@@ -76,6 +76,7 @@
         <file>icons/info.png</file>
         <file>icons/merge.png</file>
         <file>icons/sort.png</file>
+        <file>icons/event-collision.png</file>
         <file>icons/event-create.png</file>
         <file>icons/event-destroy.png</file>
         <file>icons/event-step.png</file>
diff --git a/src/projectcontainer.cpp b/src/projectcontainer.cpp
index d2f14a5..56346d2 100644
--- a/src/projectcontainer.cpp
+++ b/src/projectcontainer.cpp
@@ -306,7 +306,8 @@ QDataStream &operator<<(QDataStream &ds, const Object &object)
        << object.solid
        << object.depth
        << object.persistent
-       << object.events;
+       << object.events
+       << object.collisionEvents;
     return ds;
 }
 
@@ -318,7 +319,8 @@ QDataStream &operator>>(QDataStream &ds, Object &object)
        >> object.solid
        >> object.depth
        >> object.persistent
-       >> object.events;
+       >> object.events
+       >> object.collisionEvents;
     return ds;
 }
 
diff --git a/src/projectcontainer.h b/src/projectcontainer.h
index 15052c7..8d16478 100644
--- a/src/projectcontainer.h
+++ b/src/projectcontainer.h
@@ -2,6 +2,7 @@
 
 #include <vector>
 #include <list>
+#include <map>
 
 #include <QString>
 #include <QPixmap>
@@ -117,6 +118,7 @@ struct Object
     };
 
     using events_container_t = std::map<EventType, ActionsContainer>;
+    using collision_events_container_t = std::map<QString, ActionsContainer>;
 
     QString name;
     QString spriteName;
@@ -125,6 +127,7 @@ struct Object
     int depth{};
     bool persistent{};
     events_container_t events;
+    collision_events_container_t collisionEvents;
 };
 
 struct Room