diff -r 7b9b85b459de -r 5b7a8f2270ff src/ui/polygonobjecteditor.cpp
--- a/src/ui/polygonobjecteditor.cpp	Sun Mar 13 14:53:14 2022 +0200
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,96 +0,0 @@
-#include <QFormLayout>
-#include <QSplitter>
-#include "document.h"
-#include "modeleditor.h"
-#include "widgets/vec3editor.h"
-#include "ui/polygonobjecteditor.h"
-
-static constexpr char INDEX_NAME[] = "_ldforge_index";
-static constexpr char LABEL_NAME[] = "_ldforge_label";
-
-PolygonObjectEditor::PolygonObjectEditor(Document* document, ldraw::id_t id) :
-	QWidget{document},
-	document{document},
-	storedObjectId{ldraw::NULL_ID.value}
-{
-	this->splitter.emplace(Qt::Vertical, this);
-	this->buildWidgets();
-	this->setObjectId(id);
-}
-
-// destructor needed for std::unique_ptr
-PolygonObjectEditor::~PolygonObjectEditor()
-{
-}
-
-ldraw::id_t PolygonObjectEditor::objectId() const
-{
-	return this->storedObjectId;
-}
-
-void PolygonObjectEditor::setObjectId(ldraw::id_t id)
-{
-	this->storedObjectId = id;
-	const QModelIndex index = this->document->getModel().find(this->objectId());
-	if (index.isValid())
-	{
-		for (int n : {0, 1, 2, 3})
-		{
-			const ldraw::Object* const object = this->document->getModel()[index.row()];
-			const ldraw::Property property = ldraw::pointProperty(n);
-			const QVariant value = object->getProperty(property);
-			this->widgets[n]->setVisible(value.isValid());
-			this->formLayout->itemAt(n, QFormLayout::LabelRole)->widget()->setVisible(value.isValid());
-			if (value.isValid())
-			{
-				this->widgets[n]->setValue(value.value<glm::vec3>());
-			}
-		}
-	}
-	else
-	{
-		for (int n : {0, 1, 2, 3})
-		{
-			this->widgets[n]->setVisible(false);
-			this->formLayout->itemAt(n, QFormLayout::LabelRole)->widget()->setVisible(false);
-		}
-	}
-}
-
-void PolygonObjectEditor::clear()
-{
-	this->setObjectId(ldraw::NULL_ID);
-}
-
-void PolygonObjectEditor::buildWidgets()
-{
-	this->formLayout = new QFormLayout{this};
-	this->setLayout(this->formLayout);
-	for (int n : {0, 1, 2, 3})
-	{
-		this->setupPointWidget(n);
-	}
-	for (std::unique_ptr<Vec3Editor>& widget : this->widgets)
-	{
-		const QString label = widget->property(LABEL_NAME).toString();
-		this->formLayout->addRow(label, widget.get());
-	}
-	this->formLayout->addRow("", &*this->splitter);
-}
-
-void PolygonObjectEditor::setupPointWidget(int n)
-{
-	std::unique_ptr<Vec3Editor> editor = std::make_unique<Vec3Editor>(glm::vec3{}, this);
-	QObject::connect(editor.get(), &Vec3Editor::valueChanged, this, &PolygonObjectEditor::pointChanged);
-	editor->setProperty(INDEX_NAME, QVariant::fromValue(n));
-	editor->setProperty(LABEL_NAME, &ldraw::traits(ldraw::pointProperty(n)).name[0]);
-	this->widgets.push_back(std::move(editor));
-}
-
-void PolygonObjectEditor::pointChanged(const glm::vec3& value)
-{
-	std::unique_ptr<ModelEditor> modelEditor = this->document->editModel();
-	const int n = this->sender()->property(INDEX_NAME).toInt();
-	const ldraw::Property property = ldraw::pointProperty(n);
-	modelEditor->setObjectProperty(this->objectId(), property, QVariant::fromValue(value));
-}